Power supply system and power supply method thereof

Abstract

The application provides a power supply system and a power supply method thereof. The power supply system comprises a first power supply with a first discharge rate, a second power supply with a second discharge rate, a first converter, a second converter and at least one controller. The controller is configured to adjust the impedance of the first converter and / or the second converter based on the frequency fluctuation of a load, and adjust the output voltage of the first converter and / or the second converter based on the impedance of the first converter and / or the second converter, so as to adjust the output power of the first power supply and / or the second power supply according to different frequency fluctuations of different loads. The frequency fluctuation of the load refers to the change of the output power of the power supply system output to the load or the change of the output current of the power supply system output to the load. According to the application, the power supply with different discharge rates can be used for main power supply based on the fluctuation of the power demand of the load end, so that the efficiency is improved and the cost is reduced.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a power supply system and power supply method thereof. Background Technology

[0002] In the field of power electronics technology, due to objective limitations such as fluctuations in load power consumption at different times and differences in electricity prices at different times, many power systems can utilize power supply systems. For example, when the load power consumption is high or the electricity price is high, the power supply system is used to supply power and maintain the normal operation of the load. When the load power consumption is low or the electricity price is low, the power supply system is used to store electrical energy to achieve peak shaving and valley filling, or to balance the peak and valley electricity prices, thereby reducing costs while ensuring normal power supply to the load. In power supply systems, high-rate power sources (such as high-rate batteries) have high output power and can output energy at high power density when the load power consumption is high, but high-rate power sources are expensive to manufacture. Low-rate power sources (such as low-rate batteries) are inexpensive, but have low output power. If low-rate power sources are used to output energy at high power density when the load power consumption is high, more low-rate power sources need to be added, which would also waste costs. During their research and practice, the inventors of this application discovered that in the prior art, using both high-power and low-power sources as the power supply for the power system requires upper-level communication to distribute and control the output power of the high-power and low-power sources. This results in a strong dependence on the communication module, low reliability of the upper-level control module, a complex and cumbersome communication process, long control time, and poor adaptability. Summary of the Invention

[0003] This application provides a power supply system and power supply method that can utilize power sources with different discharge rates to provide the main power supply based on the fluctuation of power demand at the load end, thereby improving power supply efficiency and reducing power supply costs.

[0004] In a first aspect, this application provides a power supply system comprising a first-rate power supply, a second-rate power supply, a first converter, a second converter, and at least one controller. Here, the first-rate power supply can be connected to a load via the first converter, the second-rate power supply can be connected to the load via the second converter, one end of the controller can be connected to one end of the first converter and one end of the second converter, and the other end of the controller can be connected to the other end of the first converter and the other end of the second converter. Here, the first-rate power supply is a power supply with a discharge rate greater than or equal to a target discharge rate, and the second-rate power supply is a power supply with a discharge rate less than the target discharge rate. The controller can be used to adjust the impedance of the first converter and / or the second converter based on the frequency fluctuations of the load, and to adjust the output voltage of the first converter and / or the second converter based on the impedance of the first converter and / or the second converter, so as to adjust the output power of the first-rate power supply and / or the second-rate power supply according to the different frequency fluctuations of different loads. Here, the frequency fluctuations of the load are changes in the output power output from the power supply system to the load or changes in the output current output from the power supply system to the load.

[0005] In the embodiments provided in this application, the power supply system may include two power sources with different discharge rates (e.g., a first-rate power source and a second-rate power source). Here, the first-rate power source may be a power source with a discharge rate greater than or equal to a target discharge rate (e.g., 0.4C) (e.g., a power source with a high discharge rate such as a lithium battery), and the second-rate power source may be a power source with a discharge rate less than the target discharge rate (e.g., a power source with a low discharge rate such as a lead-acid battery or a lead-carbon battery). In the power supply system, the frequency fluctuation of the load can represent the state of power consumption at the load end. When the power consumption of the load is large (e.g., the power consumption is high during peak periods), the controller can control the first-rate power source to provide the main power supply; when the power consumption at the load end is stable (e.g., the power consumption is low during trough periods), the controller can control the second-rate power source to provide the main power supply. Here, the controller can adjust the impedance of the first converter and / or the second converter based on the frequency fluctuations of the load, and adjust the output voltage of the corresponding converter (e.g., the first converter and / or the second converter) based on the impedance of the first converter and / or the second converter, so as to adjust the output power of the first-rate power supply and / or the second-rate power supply according to the different frequency fluctuations of different loads. It can be understood that when the frequency fluctuations of the load (e.g., changes in the output power of the power supply system to the load or changes in the output current of the power supply system to the load) indicate that the power consumption of the load is large (e.g., the power consumption is high during peak periods), the controller can adjust the impedance of the first converter, and thus adjust the output voltage of the first converter, so as to control the first-rate power supply to supply power to the load with high-frequency fluctuations (e.g., the load with high power consumption). It can also be understood that when the frequency fluctuation of the load (e.g., changes in the output power or output current of the power supply system to the load) indicates that the power consumption of the load is relatively stable (e.g., the power consumption is low during the trough period), the low-frequency fluctuation of the load is large. For example, when the fluctuation of the load in the low-frequency range (e.g., the frequency fluctuation of the load in the range of less than 100Hz) is greater than the low-frequency fluctuation threshold, the controller can determine that the load is a low-frequency load. At this time, the controller can adjust the impedance of the second converter, and then adjust the output voltage of the second converter to control the second-rate power supply to supply power to the low-frequency fluctuating load (e.g., the load with low power consumption).

[0006] Using the implementation method provided in this application, the controller can control the impedance of different discharge converters and the output voltage of different converters based on the fluctuation of power demand at the load end. Thus, when the power consumption at the load end is large (e.g., the power consumption is high during peak periods), the power supply with a higher discharge rate (e.g., a first-rate power supply) is used for the main power supply, and when the power consumption at the load end is stable (e.g., the power consumption is low during trough periods), the power supply with a lower discharge rate (e.g., a second-rate power supply) is used for the main power supply, thereby improving power supply efficiency and reducing power supply costs.

[0007] In conjunction with the first aspect, in a first possible implementation, the load includes high-frequency loads and low-frequency loads. The controller is further configured to determine whether a load is a high-frequency load or a low-frequency load based on its frequency fluctuations. When the load's power consumption is high (e.g., power consumption is higher during peak periods), such as when the load's fluctuations in the high-frequency range (e.g., frequency fluctuations in the range greater than or equal to 100Hz) exceed a high-frequency fluctuation threshold, the load can be determined to be a high-frequency load. Conversely, when the load's power consumption is stable (e.g., power consumption is lower during trough periods), such as when the load's fluctuations in the low-frequency range (e.g., frequency fluctuations in the range less than 100Hz) exceed a low-frequency fluctuation threshold, the load can be determined to be a low-frequency load. It is understandable that when the load's power consumption is high (e.g., power consumption is high during peak periods), such as when the load's fluctuations in the high-frequency range (e.g., frequency fluctuations in the range of 100Hz or higher) exceed the high-frequency fluctuation threshold, the controller can determine that the load is a high-frequency load. In this case, the controller can adjust the impedance of the first converter, thereby adjusting the output voltage of the first converter, to control the first-rate power supply to power the high-frequency fluctuating load (e.g., the load with high power consumption). Similarly, it is understandable that when the load's power consumption is relatively stable (e.g., power consumption is low during trough periods), the load's low-frequency fluctuations are large. For example, when the load's fluctuations in the low-frequency range (e.g., frequency fluctuations in the range of less than 100Hz) exceed the low-frequency fluctuation threshold, the controller can determine that the load is a low-frequency load. In this case, the controller can adjust the impedance of the second converter, thereby adjusting the output voltage of the second converter, to control the second-rate power supply to power the low-frequency fluctuating load (e.g., the load with low power consumption).

[0008] In conjunction with the first possible implementation of the first aspect, in a second possible implementation, the controller can also be used to reduce the high-frequency impedance of the first converter to a first high-frequency impedance when the load is a high-frequency load, and adjust the output voltage of the first converter based on the impedance of the first converter to increase the output power of the first-rate power supply. Here, the first high-frequency impedance is less than the second high-frequency impedance, and the second high-frequency impedance is the high-frequency impedance of the second converter. The controller can also be used to reduce the low-frequency impedance of the second converter to a second low-frequency impedance when the load is a low-frequency load, and adjust the output voltage of the second converter based on the impedance of the second converter to increase the output power of the second-rate power supply. Here, the second low-frequency impedance is less than the first low-frequency impedance, and the first low-frequency impedance is the low-frequency impedance of the first converter.

[0009] It is understandable that when the load's power consumption is high (e.g., power consumption is high during peak periods), such as when the load's fluctuations in the high-frequency range (e.g., frequency fluctuations in the range greater than or equal to 100Hz) exceed the high-frequency fluctuation threshold, the controller can determine that the load is a high-frequency load. In this case, the controller can reduce the impedance of the first converter and adjust the output voltage of the first converter to increase the output power of the first-rate power supply, controlling the first-rate power supply to power the high-frequency fluctuating load (e.g., the load with high power consumption). Similarly, it is understandable that when the load's power consumption is relatively stable (e.g., power consumption is low during trough periods), the load's low-frequency fluctuations are large. For example, when the load's fluctuations in the low-frequency range (e.g., frequency fluctuations in the range less than 100Hz) exceed the low-frequency fluctuation threshold, the controller can determine that the load is a low-frequency load. In this case, the controller can reduce the impedance of the second converter and adjust the output voltage of the second converter to increase the output power of the second-rate power supply, controlling the second-rate power supply to power the low-frequency fluctuating load (e.g., the load with low power consumption).

[0010] In conjunction with the second possible implementation of the first aspect, in a third possible implementation, the controller may include an impedance regulation module and a voltage control module. Here, the output terminal of the first converter may be connected to one end of the impedance regulation module, and the input terminal of the first converter may be connected to the other end of the impedance regulation module via the voltage control module. Similarly, the output terminal of the second converter may be connected to one end of the impedance regulation module, and the input terminal of the second converter may be connected to the other end of the impedance regulation module via the voltage control module. The impedance regulation module can be used to acquire the frequency fluctuations of the load and adjust the high-frequency impedance and / or low-frequency impedance of the target converter based on these fluctuations. Here, the target converter includes the first converter and / or the second converter. The voltage control module can be used to control the output voltage of the converter based on the high-frequency impedance and low-frequency impedance of the target converter.

[0011] Using the embodiments provided in this application, the impedance adjustment module can acquire the frequency fluctuation of the load and adjust the high-frequency impedance and / or low-frequency impedance of the target converter. The voltage control module can adjust the output voltage of the corresponding converter (e.g., the first converter and / or the second converter) to increase the output power of the target power supply, thereby controlling power supplies with different discharge rates to supply power to loads with different frequency fluctuations. The structure is simple, the control is convenient, the power supply efficiency is improved, and the power supply cost is reduced.

[0012] In conjunction with the third possible implementation of the first aspect, in the fourth possible implementation, the impedance adjustment module is used to acquire the output voltage and output current values ​​of the converter, acquire the frequency fluctuation of the load based on the output voltage and output current values, and adjust the high-frequency impedance and / or low-frequency impedance of the target converter based on the frequency fluctuation of the load. Here, the first high-frequency impedance is less than the first low-frequency impedance and less than the second high-frequency impedance, and the second low-frequency impedance is less than the second high-frequency impedance and less than the first low-frequency impedance.

[0013] In the power supply system, the impedance regulation module can acquire the output voltage and output current values ​​of the target converter (e.g., a first converter or a second converter), determine the frequency fluctuations of the load based on the output voltage and output current values ​​(e.g., frequency fluctuations of the load in a frequency range greater than or equal to 100Hz, and / or frequency fluctuations of the load in a frequency range less than 100Hz), and adjust the high-frequency impedance and / or low-frequency impedance of the target converter based on the load frequency fluctuations (e.g., a first high-frequency impedance and / or a first low-frequency impedance, a second high-frequency impedance and / or a second low-frequency impedance). Here, the high-frequency impedance can be the impedance corresponding to an output current value (or output voltage value) with a frequency greater than or equal to 100Hz, and the low-frequency impedance can be the impedance corresponding to an output current value (or output voltage value) with a frequency less than 100Hz. Here, the first high-frequency impedance is less than the first low-frequency impedance and less than the second high-frequency impedance, and the second low-frequency impedance is less than the second high-frequency impedance and less than the first low-frequency impedance. The voltage control module can generate a reference voltage control signal for the target converter based on the output current value of the converter, the high-frequency impedance of the target converter, and the low-frequency impedance of the target converter, and control the output voltage of the converter through the reference voltage value control signal. It is understandable that when the load's power consumption is high (e.g., during peak power consumption periods), the high-frequency component in the converter's output current is higher. Since the first high-frequency impedance corresponding to the first-rate power supply is lower than the second high-frequency impedance corresponding to the second-rate power supply, the output power of the first-rate power supply is greater than the output power of the second-rate power supply. In other words, the first-rate power supply primarily powers the load in this situation. Furthermore, it can be understood that when the load's power consumption is stable (e.g., during trough power consumption periods), the low-frequency component in the converter's output current is higher. Since the second low-frequency impedance corresponding to the second-rate power supply is lower than the first low-frequency impedance corresponding to the first-rate power supply, the output power of the second-rate power supply is greater than the output power of the first-rate power supply. In other words, the second-rate power supply primarily powers the load in this situation.

[0014] By adopting the implementation method provided in this application, the power demand fluctuation of the load can be judged by the output voltage and output current values ​​of the converter, and different impedance adjustments can be made to the converters connected to power supplies with different discharge rates. Thus, when the power consumption at the load is large (e.g., the power consumption is high during peak periods), the power supply with a higher discharge rate (e.g., the first rate power supply) is used for the main power supply, and when the power consumption at the load is stable (e.g., the power consumption is low during trough periods), the power supply with a lower discharge rate (e.g., the second rate power supply) is used for the main power supply, thereby improving power supply efficiency and reducing power supply costs.

[0015] In conjunction with the fourth possible implementation of the first aspect, in the fifth possible implementation, the power supply system may include two controllers. The output terminal of the first converter may be connected to one end of the impedance regulation module of one of the two controllers, and the input terminal of the first converter may be connected to the other end of the impedance regulation module of one controller through the voltage control module of one controller. The output terminal of the second converter may be connected to one end of the impedance regulation module of the other controller, and the input terminal of the second converter may be connected to the other end of the impedance regulation module of the other controller through the voltage control module of the other controller.

[0016] Using the implementation method provided in this application, the high-frequency impedance and low-frequency impedance of the first and second rate power supplies can be adjusted respectively by the impedance adjustment modules in the two controllers, and the output voltage of the first and second converters can be controlled respectively by the voltage control modules in the two controllers, thereby improving the control efficiency of the system.

[0017] In conjunction with the fifth possible implementation of the first aspect, in the sixth possible implementation, the impedance adjustment module can also be used to determine the load impedance based on the output voltage and output current values ​​of the converter, and adjust the high-frequency impedance and / or low-frequency impedance of the target converter based on the load impedance. Here, the first low-frequency impedance is less than or equal to the load impedance, and the second high-frequency impedance is less than or equal to the load impedance. That is, when a change in the load impedance causes fluctuations in the power consumption at the load end, the impedance adjustment module can also determine the load impedance based on the output voltage and output current values ​​of the converter, and adjust the high-frequency impedance and / or low-frequency impedance of the target converter based on the load impedance, so that the power supply system matches the load impedance, further improving the power supply efficiency of the power supply system and reducing the power supply cost.

[0018] In conjunction with the sixth possible implementation of the first aspect, in the seventh possible implementation, the controller may further include a frequency division unit. Here, one end of the frequency division unit may be connected to the output terminal of the first converter and / or the output terminal of the second converter, and the other end of the frequency division unit may be connected to the impedance adjustment module in the controller to which the frequency division unit belongs. This frequency division unit can be used to acquire the output current value of the converter, divide the output current value by frequency to obtain a frequency-divided output current value, determine a high-frequency current value based on the current component in the frequency-divided output current value with a frequency greater than or equal to the target frequency (e.g., 100Hz), determine a low-frequency current value based on the current component in the frequency-divided output current value with a frequency less than the target frequency, and use the high-frequency current value and the low-frequency current value as the output current value of the converter. It can be understood that when the load power consumption is high (e.g., power consumption is high during peak periods), the high-frequency component in the converter's output current is higher. It can also be understood that when the load power consumption is stable (e.g., power consumption is low during trough periods), the low-frequency component in the converter's output current is higher. Using the implementation method provided in this application, the frequency division unit can determine the high-frequency current value and low-frequency current value of the converter output based on the output current value after frequency division, and transmit the high-frequency current value and low-frequency current value as the output current value of the converter to the voltage control module, thereby improving the control accuracy of the power supply system and further improving the power supply efficiency.

[0019] In conjunction with the seventh possible implementation of the first aspect, in the eighth possible implementation, the voltage control module may include a voltage reference unit and a voltage control unit. Here, one end of the voltage reference unit may be connected to an impedance adjustment module in the controller to which the voltage reference unit belongs, and the other end of the voltage reference unit may be connected to the first converter and / or the second converter through the voltage control unit in the controller to which the voltage reference unit belongs. The voltage reference unit can be used to generate a high-frequency reference voltage value for the target converter based on the high-frequency current value in the converter's output current value and the high-frequency impedance of the target converter, and to generate a low-frequency reference voltage value for the target converter based on the low-frequency current value in the converter's output current value and the low-frequency impedance of the target converter. The low-frequency reference voltage value and the high-frequency reference voltage value are then superimposed to obtain the target reference voltage value of the target converter. The voltage control unit can be used to generate a reference voltage control signal (e.g., a pulse width modulation signal or other control signal that can control the converter's output voltage) for the target converter based on the target reference voltage value, and to control the converter's output voltage through the reference voltage control signal. Using the implementation method provided in this application, the voltage reference unit can generate a high-frequency reference voltage value of the target converter based on the high-frequency current value in the output current value of the converter and the high-frequency impedance of the target converter, and generate a low-frequency reference voltage value of the target converter based on the low-frequency current value in the output current value of the converter and the low-frequency impedance of the target converter. The low-frequency reference voltage value and the high-frequency reference voltage value are superimposed to obtain the target reference voltage value of the target converter, which further improves the power supply efficiency of the power supply system. The structure is simple and the control is convenient.

[0020] In conjunction with the first aspect or any possible implementation of the first aspect, in the ninth possible implementation, the power supply system may further include a photovoltaic current source and a third converter, wherein the photovoltaic current source is connected to the load through the third converter.

[0021] In conjunction with the ninth possible implementation of the first aspect, in the tenth possible implementation, the power supply system may further include a converter circuit, through which the converter is connected to the load, and the converter may be a first converter, a second converter, or a third converter.

[0022] In conjunction with the tenth possible implementation of the first aspect, in the eleventh possible implementation, the power supply system may further include a combiner box, through which the converter is connected to the converter circuit.

[0023] In conjunction with the eleventh possible implementation of the first aspect, in the twelfth possible implementation, the power supply system may further include a DC bus, the converter is connected to the DC bus through a combiner box, and the DC bus is connected to the converter circuit.

[0024] In conjunction with the twelfth possible implementation of the first aspect, in the thirteenth possible implementation, the power supply system may further include a grid connection device, through which the converter circuit is connected to the load.

[0025] In this application, the functional modules of the power supply system are composed in a variety of flexible ways, which can adapt to different power supply environments, improve the diversity of application scenarios of the power supply system, and enhance the adaptability of the power supply system.

[0026] Secondly, this application provides a power supply method for a power supply system, which is applicable to the power supply system in the first aspect or any possible embodiment of the first aspect. The method includes: a controller adjusting the impedance of a first converter and / or a second converter based on the frequency fluctuations of the load. The controller adjusts the output voltage of the first converter and / or the second converter based on their impedances to adjust the output power of the first-rate power supply and / or the second-rate power supply according to the different frequency fluctuations of different loads. Here, the frequency fluctuation of the load refers to the change in the output power of the power supply system to the load or the change in the output current of the power supply system to the load.

[0027] In the embodiments provided in this application, the power supply system may include two power sources with different discharge rates (e.g., a first-rate power source and a second-rate power source). Here, the first-rate power source may be a power source with a discharge rate greater than or equal to a target discharge rate (e.g., 0.4C) (e.g., a power source with a high discharge rate such as a lithium battery), and the second-rate power source may be a power source with a discharge rate less than the target discharge rate (e.g., a power source with a low discharge rate such as a lead-acid battery or a lead-carbon battery). In the power supply system, the frequency fluctuation of the load can represent the state of power consumption at the load end. When the power consumption of the load is large (e.g., the power consumption is high during peak periods), the controller can control the first-rate power source to provide the main power supply; when the power consumption at the load end is stable (e.g., the power consumption is low during trough periods), the controller can control the second-rate power source to provide the main power supply. Here, the controller can adjust the impedance of the first converter and / or the second converter based on the frequency fluctuations of the load, and adjust the output voltage of the corresponding converter (e.g., the first converter and / or the second converter) based on the impedance of the first converter and / or the second converter, so as to adjust the output power of the first-rate power supply and / or the second-rate power supply according to the different frequency fluctuations of different loads. It can be understood that when the frequency fluctuations of the load (e.g., changes in the output power of the power supply system to the load or changes in the output current of the power supply system to the load) indicate that the power consumption of the load is large (e.g., the power consumption is high during peak periods), the controller can adjust the impedance of the first converter, and thus adjust the output voltage of the first converter, so as to control the first-rate power supply to supply power to the load with high-frequency fluctuations (e.g., the load with high power consumption). It can also be understood that when the frequency fluctuation of the load (e.g., changes in the output power or output current of the power supply system to the load) indicates that the power consumption of the load is relatively stable (e.g., the power consumption is low during periods of low power consumption), such as when the load fluctuation in the low-frequency range (e.g., the frequency fluctuation of the load in the range of less than 100Hz) is greater than the low-frequency fluctuation threshold, the controller can determine that the load is a low-frequency load. At this time, the controller can adjust the impedance of the second converter, and then adjust the output voltage of the second converter to control the second-rate power supply to supply power to the low-frequency fluctuating load (e.g., the load with low power consumption).

[0028] Using the implementation method provided in this application, the controller can control the impedance of different discharge converters and the output voltage of different converters based on the fluctuation of power demand at the load end. Thus, when the power consumption at the load end is large (e.g., the power consumption is high during peak periods), the power supply with a higher discharge rate (e.g., a first-rate power supply) is used for the main power supply, and when the power consumption at the load end is stable (e.g., the power consumption is low during trough periods), the power supply with a lower discharge rate (e.g., a second-rate power supply) is used for the main power supply, thereby improving power supply efficiency and reducing power supply costs.

[0029] In conjunction with the second aspect, in the first possible implementation, the load includes high-frequency loads and low-frequency loads. Before the controller adjusts the impedance of the first converter and / or the second converter based on the frequency fluctuations of the load, the method further includes: the controller determining whether the load is a high-frequency load or a low-frequency load based on the frequency fluctuations of the load. When the power consumption of the load is large (e.g., power consumption is high during peak periods), such as when the fluctuation of the load in the high-frequency range (e.g., the frequency fluctuation of the load in the range of frequencies greater than or equal to 100Hz) is greater than a high-frequency fluctuation threshold, the load can be determined to be a high-frequency load; when the power consumption at the load end is stable (e.g., power consumption is low during trough periods), such as when the fluctuation of the load in the low-frequency range (e.g., the frequency fluctuation of the load in the range of frequencies less than 100Hz) is greater than a low-frequency fluctuation threshold, the load can be determined to be a low-frequency load. It is understandable that when the load's power consumption is high (e.g., power consumption is high during peak periods), such as when the load's fluctuations in the high-frequency range (e.g., frequency fluctuations in the range of 100Hz or higher) exceed the high-frequency fluctuation threshold, the controller can determine that the load is a high-frequency load. In this case, the controller can adjust the impedance of the first converter, thereby adjusting the output voltage of the first converter, to control the first-rate power supply to power the high-frequency fluctuating load (e.g., the load with high power consumption). Similarly, it is understandable that when the load's power consumption is relatively stable (e.g., power consumption is low during trough periods), the load's low-frequency fluctuations are large. For example, when the load's fluctuations in the low-frequency range (e.g., frequency fluctuations in the range of less than 100Hz) exceed the low-frequency fluctuation threshold, the controller can determine that the load is a low-frequency load. In this case, the controller can adjust the impedance of the second converter, thereby adjusting the output voltage of the second converter, to control the second-rate power supply to power the low-frequency fluctuating load (e.g., the load with low power consumption).

[0030] In conjunction with the first possible implementation of the second aspect, in the second possible implementation, the frequency fluctuation of the load includes high-frequency fluctuations and / or low-frequency fluctuations of the load. The controller adjusts the impedance of the first converter and / or the second converter based on the frequency fluctuations of the load, comprising: when the load is a high-frequency load, the controller reduces the high-frequency impedance of the first converter to a first high-frequency impedance and adjusts the output voltage of the first converter based on the impedance of the first converter to increase the output power of the first-rate power supply, wherein the first high-frequency impedance is less than the second high-frequency impedance, and the second high-frequency impedance is the high-frequency impedance of the second converter. When the load is a low-frequency load, the controller reduces the low-frequency impedance of the second converter to a second low-frequency impedance and adjusts the output voltage of the second converter based on the impedance of the second converter to increase the output power of the second-rate power supply. Here, the second low-frequency impedance is less than the first low-frequency impedance, and the first low-frequency impedance is the low-frequency impedance of the first converter.

[0031] It is understandable that when the load's power consumption is high (e.g., power consumption is high during peak periods), such as when the load's fluctuations in the high-frequency range (e.g., frequency fluctuations in the range greater than or equal to 100Hz) exceed the high-frequency fluctuation threshold, the controller can determine that the load is a high-frequency load. In this case, the controller can reduce the impedance of the first converter and adjust the output voltage of the first converter to increase the output power of the first-rate power supply, controlling the first-rate power supply to power the high-frequency fluctuating load (e.g., the load with high power consumption). Similarly, it is understandable that when the load's power consumption is relatively stable (e.g., power consumption is low during trough periods), the load's low-frequency fluctuations are large. For example, when the load's fluctuations in the low-frequency range (e.g., frequency fluctuations in the range less than 100Hz) exceed the low-frequency fluctuation threshold, the controller can determine that the load is a low-frequency load. In this case, the controller can reduce the impedance of the second converter and adjust the output voltage of the second converter to increase the output power of the second-rate power supply, controlling the second-rate power supply to power the low-frequency fluctuating load (e.g., the load with low power consumption).

[0032] In conjunction with the second possible implementation of the second aspect, in the third possible implementation, the controller includes an impedance adjustment module and a voltage control module. Adjusting the impedance of the first converter and / or the second converter based on the frequency fluctuation of the load includes: the impedance adjustment module acquiring the frequency fluctuation of the load and adjusting the high-frequency impedance of the target converter and / or the low-frequency impedance of the target converter based on the frequency fluctuation of the load, wherein the target converter includes the first converter and / or the second converter.

[0033] Impedance adjustment of the first converter and / or the second converter: The output voltage of the first converter and / or the second converter is adjusted by a voltage control module based on the high-frequency impedance and low-frequency impedance of the target converter.

[0034] Using the embodiments provided in this application, the impedance adjustment module can acquire the frequency fluctuation of the load and adjust the high-frequency impedance and / or low-frequency impedance of the target converter. The voltage control module can adjust the output voltage of the corresponding converter (e.g., the first converter and / or the second converter) to control the power supply with different discharge rates to supply power to the load with different frequency fluctuations. The structure is simple, the control is convenient, the power supply efficiency is improved, and the power supply cost is reduced.

[0035] In conjunction with the third possible implementation of the second aspect, in the fourth possible implementation, the impedance adjustment module acquires the frequency fluctuation of the load and adjusts the high-frequency impedance and / or low-frequency impedance of the target converter based on the load frequency fluctuation. This includes: the impedance adjustment module acquires the output voltage and output current values ​​of the converter, acquires the frequency fluctuation of the load based on the output voltage and output current values, and adjusts the high-frequency impedance and / or low-frequency impedance of the target converter based on the load frequency fluctuation. Here, the target converter includes a first converter and / or a second converter, wherein the first high-frequency impedance is less than the first low-frequency impedance and less than the second high-frequency impedance, and the second low-frequency impedance is less than the second high-frequency impedance and less than the first low-frequency impedance.

[0036] In a power supply system, an impedance regulation module can acquire the output voltage and output current values ​​of a target converter (e.g., a first converter or a second converter), determine the high-frequency fluctuations (e.g., frequency fluctuations of the load within a frequency range greater than or equal to 100Hz) and / or low-frequency fluctuations (e.g., frequency fluctuations of the load within a frequency range less than 100Hz) of the load based on these values, and adjust the high-frequency impedance and / or low-frequency impedance of the target converter (e.g., a first high-frequency impedance and / or a first low-frequency impedance, a second high-frequency impedance and / or a second low-frequency impedance) based on the load's frequency fluctuations. Here, the high-frequency impedance can be the impedance corresponding to an output current value (or output voltage value) with a frequency greater than or equal to 100Hz, and the low-frequency impedance can be the impedance corresponding to an output current value (or output voltage value) with a frequency less than 100Hz. Here, the first high-frequency impedance is less than the first low-frequency impedance and less than the second high-frequency impedance, and the second low-frequency impedance is less than the second high-frequency impedance and less than the first low-frequency impedance. The voltage control module generates a reference voltage control signal for the target converter based on the converter's output current value, the target converter's high-frequency impedance, and the target converter's low-frequency impedance. It then controls the converter's output voltage using this reference voltage control signal. It can be understood that when the load's power consumption is high (e.g., during peak periods), the high-frequency component of the converter's output current is higher. Since the first high-frequency impedance corresponding to the first-rate power supply is lower than the second high-frequency impedance corresponding to the second-rate power supply, the output power of the first-rate power supply is greater than the output power of the second-rate power supply. In other words, the first-rate power supply primarily powers the load in this situation. Furthermore, it can be understood that when the load's power consumption is stable (e.g., during trough periods), the low-frequency component of the converter's output current is higher. Since the second low-frequency impedance corresponding to the second-rate power supply is lower than the first low-frequency impedance corresponding to the first-rate power supply, the output power of the second-rate power supply is greater than the output power of the first-rate power supply. In other words, the second-rate power supply primarily powers the load in this situation.

[0037] By adopting the implementation method provided in this application, the power demand fluctuation of the load can be judged by the output voltage and output current values ​​of the converter, and different impedance adjustments can be made to the converters connected to power supplies with different discharge rates. Thus, when the power consumption at the load is large (e.g., the power consumption is high during peak periods), the power supply with a higher discharge rate (e.g., the first rate power supply) is used for the main power supply, and when the power consumption at the load is stable (e.g., the power consumption is low during trough periods), the power supply with a lower discharge rate (e.g., the second rate power supply) is used for the main power supply, thereby improving power supply efficiency and reducing power supply costs.

[0038] In conjunction with the fourth possible implementation of the second aspect, in the fifth possible implementation, after the impedance adjustment module obtains the output voltage and output current values ​​of the converter, the method further includes: the impedance adjustment module determining the load impedance based on the output voltage and output current values ​​of the converter, and adjusting the high-frequency impedance and / or low-frequency impedance of the target converter based on the load impedance. Here, the first low-frequency impedance is less than or equal to the load impedance, and the second high-frequency impedance is less than or equal to the load impedance. In the embodiments provided in this application, when a change in the load impedance causes fluctuations in the power consumption at the load end, the impedance adjustment module can also determine the load impedance based on the output voltage and output current values ​​of the converter, and adjust the high-frequency impedance and / or low-frequency impedance of the target converter based on the load impedance, so that the power supply system matches the load impedance, further improving the power supply efficiency of the power supply system and reducing the power supply cost.

[0039] In conjunction with the fifth possible implementation of the second aspect, in the sixth possible implementation, the controller further includes a frequency division acquisition unit. After the impedance adjustment module acquires the output voltage and output current values ​​of the converter, the method further includes: the frequency division acquisition unit acquires the output current value of the converter, and divides the output current value by frequency to obtain a frequency-divided output current value; determining a high-frequency current value based on the current component in the frequency-divided output current value with a frequency greater than or equal to the target frequency; determining a low-frequency current value based on the current component in the frequency-divided output current value with a frequency less than the target frequency; and using the high-frequency current value and the low-frequency current value as the output current value of the converter. It can be understood that when the load's power consumption is high (e.g., power consumption is high during peak periods), the high-frequency component in the converter's output current is higher. It can also be understood that when the load's power consumption is stable (e.g., power consumption is low during trough periods), the low-frequency component in the converter's output current is higher. Using the implementation method provided in this application, the frequency division unit can determine the high-frequency current value and low-frequency current value of the converter output based on the output current value after frequency division, and transmit the high-frequency current value and low-frequency current value as the output current value of the converter to the voltage control module, thereby improving the control accuracy of the power supply system and further improving the power supply efficiency.

[0040] In conjunction with the sixth possible implementation of the second aspect, in the seventh possible implementation, the voltage control module includes a voltage reference unit and a voltage control unit. The voltage control module controls the output voltage of the target converter based on its high-frequency impedance and low-frequency impedance. This includes: the voltage reference unit generating a high-frequency reference voltage value for the target converter based on the high-frequency current value in the converter's output current value and the high-frequency impedance of the target converter; and generating a low-frequency reference voltage value for the target converter based on the low-frequency current value in the converter's output current value and the low-frequency impedance of the target converter. The low-frequency reference voltage value and the high-frequency reference voltage value are then superimposed to obtain the target reference voltage value of the target converter. The voltage control unit generates a reference voltage control signal for the target converter based on the target reference voltage value and controls the output voltage of the converter through the reference voltage control signal. Using the implementation method provided in this application, the voltage reference unit can generate a high-frequency reference voltage value of the target converter based on the high-frequency current value in the output current value of the converter and the high-frequency impedance of the target converter, and generate a low-frequency reference voltage value of the target converter based on the low-frequency current value in the output current value of the converter and the low-frequency impedance of the target converter. The low-frequency reference voltage value and the high-frequency reference voltage value are superimposed to obtain the target reference voltage value of the target converter, which further improves the power supply efficiency of the power supply system. The structure is simple and the control is convenient. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of an application scenario for the power supply system provided in the embodiments of this application;

[0042] Figure 2 This is a schematic diagram of the power supply system provided in an embodiment of this application;

[0043] Figure 3 This is another structural schematic diagram of the power supply system provided in the embodiments of this application;

[0044] Figure 4 This is another structural schematic diagram of the power supply system provided in the embodiments of this application;

[0045] Figure 5 This is another structural schematic diagram of the power supply system provided in the embodiments of this application;

[0046] Figure 6 This is another structural schematic diagram of the power supply system provided in the embodiments of this application;

[0047] Figure 7 This is another structural schematic diagram of the power supply system provided in the embodiments of this application;

[0048] Figure 8 This is another structural schematic diagram of the power supply system provided in the embodiments of this application;

[0049] Figure 9This is another structural schematic diagram of the power supply system provided in the embodiments of this application;

[0050] Figure 10 This is a flowchart illustrating the power supply method provided in an embodiment of this application. Detailed Implementation

[0051] The power supply system provided in this application can be applied to various fields, including new energy smart microgrids, power transmission and distribution, new energy fields (such as photovoltaic grid-connected fields, thermal power grid-connected fields, or wind power grid-connected fields), photovoltaic power generation, wind power generation, thermal power generation, or high-power converter fields (such as converting DC power to high-power high-voltage AC power), etc. The specific application scenario can be determined accordingly, and no restrictions are imposed here. The power supply system provided in this application can be applied to power supply systems with different power generation devices, such as photovoltaic power supply systems, wind power supply systems, thermal power supply systems, nuclear power supply systems, chemical power supply systems, or biomass power supply systems. The specific application scenario can be determined according to the actual application scenario, and no restrictions are imposed here. The power supply system provided in this application can be adapted to different application scenarios, such as powering loads in photovoltaic-storage power supply environments, wind-storage power supply environments, pure energy storage power supply environments, or other application scenarios. The following will use the application scenario of powering loads in a pure energy storage power supply environment as an example for explanation, and will not be elaborated further.

[0052] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating an application scenario of the power supply system provided in this application embodiment. In a pure energy storage power supply application scenario, such as... Figure 1 As shown, the power supply system 1 includes a first-rate power supply 11, a second-rate power supply 12, a first converter 13, a second converter 14, and at least one controller 2. The first-rate power supply 11 is connected to the load 3 via the first converter 13, the second-rate power supply 12 is connected to the load 3 via the second converter 14, and the controller 2 is connected to the output and input terminals of the converters (first converter 13 and / or second converter 14). In some feasible embodiments, the power supply (first-rate power supply 11 and / or second-rate power supply 12) can supply power to the load 3 via the converter (first converter 13 and / or second converter 14). It is understood that the power supply (first-rate power supply 11 and / or second-rate power supply 12) provided in this application is suitable for powering base station equipment in remote areas with no or poor mains power, or for powering batteries, or for powering household appliances (such as refrigerators, air conditioners, etc.), etc., in various application scenarios where multiple types of electrical equipment are powered. The specific application scenario can be determined according to the actual application scenario, and no limitation is made here. Furthermore, it can be understood that... Figure 1The load 3 in the text can be a power grid, a battery, building electrical equipment, household electrical equipment, or other electrical devices. The power grid here can include transmission lines, power transfer stations, batteries, communication base stations, or household appliances and other electrical equipment or power transmission equipment. Here, the first-rate power supply 11 can be a power supply with a discharge rate greater than or equal to the target discharge rate (e.g., 0.4C) (e.g., a lithium battery or other power supply with a high discharge rate), and the second-rate power supply 12 can be a power supply with a discharge rate less than the target discharge rate (e.g., a lead-acid battery, lead-carbon battery, or other power supply with a low discharge rate). It is understood that the first-rate power supply 11 and the second-rate power supply 12 have different discharge rates. The first-rate power supply 11 has a high output power and can output energy at high power density, while the second-rate power supply 12, although having a lower output power, has a lower cost. Here, controller 2 can adjust the impedance of the first converter 13 and / or the second converter 14 based on the frequency fluctuations of the load 3, and adjust the output voltage of the first converter 13 and / or the second converter 14 based on the impedances of the first converter 13 and / or the second converter 14, so as to adjust the output power of the first-rate power supply and / or the second-rate power supply according to the different frequency fluctuations of different loads. Here, the frequency fluctuation of the load is the change in the output power output from the power supply system to the load or the change in the output current output from the power supply system to the load.

[0053] Using the implementation method provided in this application, the controller 2 can control the impedance of different discharge converters based on the power demand fluctuations of the load 3. Thus, when the frequency fluctuations of the load (e.g., changes in the output power from the power supply system to the load or changes in the output current from the power supply system to the load) indicate that the power consumption at the load end is large (e.g., the power consumption is high during peak periods), the controller 2 uses a power supply with a higher discharge rate (e.g., the first rate power supply 11) to provide the main power supply. When the frequency fluctuations of the load (e.g., changes in the output power from the power supply system to the load or changes in the output current from the power supply system to the load) indicate that the power consumption at the load end is stable (e.g., the power consumption is low during trough periods), the controller 2 uses a power supply with a lower discharge rate (e.g., the second rate power supply 12) to provide the main power supply, thereby improving power supply efficiency and reducing power supply costs.

[0054] In some feasible implementations, load 3 includes high-frequency loads and low-frequency loads. The controller 2 is further used to determine whether the load is a high-frequency load or a low-frequency load based on the frequency fluctuations of load 3. When the power consumption of load 3 is high (e.g., power consumption is high during peak periods), such as when the fluctuations of load 3 in the high-frequency range (e.g., frequency fluctuations of the load in a frequency range greater than or equal to 100Hz) exceed a high-frequency fluctuation threshold, load 3 can be determined to be a high-frequency load. When the power consumption of load 3 is stable (e.g., power consumption is low during trough periods), such as when the fluctuations of load 3 in the low-frequency range (e.g., frequency fluctuations of the load in a frequency range less than 100Hz) exceed a low-frequency fluctuation threshold, load 3 can be determined to be a low-frequency load. It is understandable that when the power consumption of load 3 is relatively high (e.g., power consumption is high during peak periods), such as when the fluctuation of load 3 in the high-frequency range (e.g., the frequency fluctuation of the load in the range of 100Hz or higher) exceeds the high-frequency fluctuation threshold, the controller can determine that the load is a high-frequency load. At this time, the controller can adjust the impedance of the first converter 13, and thus adjust the output voltage of the first converter 13, to control the first multiplier power supply 11 to supply power to the high-frequency fluctuating load (e.g., the load with high power consumption). Simultaneously, it is understandable that when the power consumption of load 3 is relatively stable (e.g., power consumption is low during trough periods), the low-frequency fluctuation of the load is relatively large. For example, when the fluctuation of load 3 in the low-frequency range (e.g., the frequency fluctuation of the load in the range of less than 100Hz) exceeds the low-frequency fluctuation threshold, the controller can determine that load 3 is a low-frequency load. At this time, the controller can adjust the impedance of the second converter 14, and thus adjust the output voltage of the second converter 14, to control the second multiplier power supply 12 to supply power to the low-frequency fluctuating load (e.g., the load with low power consumption).

[0055] It is understandable that the load here can exhibit characteristics of both high-frequency and low-frequency loads. For example, some loads require a large amount of power and need to be powered by a power supply with a high discharge rate, while other loads require a more stable amount of power and can be powered by a power supply with a low discharge rate. In this case, the controller can control the high-frequency impedance and / or low-frequency impedance of the converter separately, and accordingly change the output voltage of the converter, thereby adjusting the output power of different power supplies.

[0056] In some feasible implementations, when the power consumption of load 3 is high (e.g., power consumption is high during peak periods), the high-frequency fluctuations of load 3 (e.g., frequency fluctuations of load 3 within a frequency range greater than or equal to 100Hz) are large; when the power consumption of load 3 is stable (e.g., power consumption is low during trough periods), the low-frequency fluctuations of load 3 (e.g., frequency fluctuations of load 3 within a frequency range less than 100Hz) are large. Controller 2 can adjust the impedance of the first converter 13 and / or the second converter 14 based on the frequency fluctuations of load 3, and adjust the output voltage of the corresponding converter (e.g., the first converter 13 and / or the second converter 14) based on the impedance of the first converter 13 and / or the second converter 14, to control power supplies with different discharge rates to supply power to loads with different frequency fluctuations. It is understandable that when the power consumption of load 3 is high (e.g., high power consumption during peak periods), the high-frequency fluctuations of load 3 are significant. Controller 2 can adjust the impedance of the first converter 13, thereby adjusting the output voltage of the first converter 13, to control the first-rate power supply 11 to supply power to the load with high-frequency fluctuations (e.g., load 3 with high power consumption). Similarly, it is understandable that when the power consumption of load 3 is relatively stable (e.g., low power consumption during trough periods), the low-frequency fluctuations of load 3 are significant. Controller 2 can adjust the impedance of the second converter 14, thereby adjusting the output voltage of the second converter 14, to control the second-rate power supply 12 to supply power to the load with low-frequency fluctuations (e.g., load 3 with low power consumption). Using the implementation method provided in this application, the system can determine the fluctuation of power demand at the load end by the output voltage and output current values ​​of the converter, and perform different impedance adjustments on the converters connected to power supplies with different discharge rates. Thus, when the power consumption at the load end is large (for example, the power consumption is high during the peak period), the power supply with a higher discharge rate (for example, the first rate power supply 11) is used for the main power supply, and when the power consumption at the load end is stable (for example, the power consumption is low during the trough period), the power supply with a lower discharge rate (for example, the second rate power supply 12) is used for the main power supply, thereby improving power supply efficiency and reducing power supply costs.

[0057] It is understood that in other application scenarios (such as different electricity prices or other conditions), the solution provided in this application can also be used to control the output power of two power sources, so that one of the power sources provides the main power supply. These solutions are not fundamentally different from the solution that this invention wants to protect, and they also fall within the scope of protection covered by this application.

[0058] The following will combine Figures 2 to 10 The power supply system provided in this application and its working principle are illustrated with examples.

[0059] Please see Figure 2 , Figure 2This is a schematic diagram of the power supply system provided in an embodiment of this application. Figure 2 As shown, the power supply system includes a first-rate power supply 101, a second-rate power supply 102, a first converter 103, a second converter 104, and at least one controller. Each controller includes an impedance regulation module 106 and a voltage control module 105. Here, the first-rate power supply 101 can be connected to the load via the first converter 103, and the second-rate power supply 102 can be connected to the load via the second converter 104. The output terminal of the first converter 103 can be connected to one end of the impedance regulation module 106 of the controller, and the input terminal of the first converter 103 can be connected to the other end of the impedance regulation module 106 of the controller via the voltage control module 105. Similarly, the output terminal of the second converter 104 can be connected to one end of the impedance regulation module 106 of the controller, and the input terminal of the second converter 104 can be connected to the other end of the impedance regulation module 106 of the controller via the voltage control module 105. Here, the first-rate power supply 101 is a power supply with a discharge rate greater than or equal to the target discharge rate, and the second-rate power supply 102 is a power supply with a discharge rate less than the target discharge rate. The impedance adjustment module 106 is used to acquire the output voltage and output current values ​​of the converter, and adjust the high-frequency impedance and / or low-frequency impedance of the target converter based on these values. Here, the target converter is the first converter 103, and its high-frequency impedance and / or low-frequency impedance are the first high-frequency impedance and / or the first low-frequency impedance; or the target converter is the second converter 104, and its high-frequency impedance and / or low-frequency impedance are the second high-frequency impedance and / or the second low-frequency impedance. Here, the first high-frequency impedance is less than the first low-frequency impedance and less than the second high-frequency impedance, and the second low-frequency impedance is less than the second high-frequency impedance and less than the first low-frequency impedance. The voltage control module 105 here can be used to generate a reference voltage control signal for the target converter based on the output current value of the converter, the high-frequency impedance of the target converter, and the low-frequency impedance of the target converter, and control the output voltage of the converter through the reference voltage value control signal to increase the output power of the target power supply.

[0060] In the embodiments provided in this application, the power supply system may include two power sources with different discharge rates (e.g., a first-rate power source 101 and a second-rate power source 102). Here, the first-rate power source 101 may be a power source with a discharge rate greater than or equal to a target discharge rate (e.g., 0.4C) (e.g., a power source with a high discharge rate such as a lithium battery), and the second-rate power source 102 may be a power source with a discharge rate less than the target discharge rate (e.g., a power source with a low discharge rate such as a lead-acid battery or a lead-carbon battery). In the power supply system, the impedance adjustment module 106 may acquire the output voltage and output current values ​​of the target converter (e.g., a first converter 103 or a second converter 104), and adjust the high-frequency impedance and / or low-frequency impedance of the target converter (e.g., a first high-frequency impedance and / or a first low-frequency impedance, a second high-frequency impedance and / or a second low-frequency impedance) based on the output voltage and output current values. Here, the high-frequency impedance can be the impedance corresponding to an output current value (or output voltage value) with a frequency greater than or equal to 100Hz, and the low-frequency impedance can be the impedance corresponding to an output current value (or output voltage value) with a frequency less than 100Hz. Here, the first high-frequency impedance is less than the first low-frequency impedance and less than the second high-frequency impedance, and the second low-frequency impedance is less than the second high-frequency impedance and less than the first low-frequency impedance. The voltage control module 105 can generate a reference voltage control signal for the target converter based on the converter's output current value, the target converter's high-frequency impedance, and the target converter's low-frequency impedance, and control the converter's output voltage through the reference voltage control signal. It can be understood that when the load's power consumption is high (for example, power consumption is high during peak periods), the high-frequency component in the converter's output current is higher. Since the first high-frequency impedance corresponding to the first multiplier power supply 101 is less than the second high-frequency impedance corresponding to the second multiplier power supply 102, the output power of the first multiplier power supply 101 is greater than the output power of the second multiplier power supply 102. That is to say, at this time, the first multiplier power supply 101 mainly supplies power to the load. It can be further understood that when the load's power consumption is stable (for example, the power consumption is low during the trough period), the low-frequency component in the converter's output current is higher. Since the second low-frequency impedance corresponding to the second-rate power supply 102 is less than the first low-frequency impedance corresponding to the first-rate power supply 101, the output power of the second-rate power supply 102 is greater than the output power of the first-rate power supply 101. In other words, at this time, the second-rate power supply 102 mainly supplies power to the load.

[0061] In some feasible implementations, the impedance adjustment module 106 can also be used to determine the load impedance based on the output voltage and output current values ​​of the converter, and adjust the high-frequency impedance and / or low-frequency impedance of the target converter based on the load impedance. Here, the first low-frequency impedance is less than or equal to the load impedance, and the second high-frequency impedance is less than or equal to the load impedance. That is, when a change in the load impedance causes fluctuations in the power consumption at the load end, the impedance adjustment module 106 can also determine the load impedance based on the output voltage and output current values ​​of the converter, and adjust the high-frequency impedance and / or low-frequency impedance of the target converter based on the load impedance, so that the power supply system matches the load impedance, further improving the power supply efficiency of the power supply system and reducing the power supply cost.

[0062] By adopting the implementation method provided in this application, the power demand fluctuation of the load can be judged by the output voltage and output current values ​​of the converter, and different impedance adjustments can be made to the converters connected to power supplies with different discharge rates. Thus, when the power consumption at the load is large (for example, the power consumption is high during the peak period), the power supply with a higher discharge rate (for example, the first rate power supply 101) is used for the main power supply, and when the power consumption at the load is stable (for example, the power consumption is low during the trough period), the power supply with a lower discharge rate (for example, the second rate power supply 102) is used for the main power supply, thereby improving power supply efficiency and reducing power supply costs.

[0063] In some feasible implementations, the power supply system may include two controllers; please refer to [link / reference needed] for details. Figure 3 , Figure 3 This is another structural schematic diagram of the power supply system provided in an embodiment of this application. For example... Figure 3 As shown, the power supply system includes two controllers (controller a and controller b). The output terminal of the first converter 203 can be connected to one end of the impedance adjustment module 206 of controller a. The input terminal of the first converter 203 can be connected to the other end of the impedance adjustment module 206 of controller a through the voltage control module 205 of controller a. The output terminal of the second converter 204 can be connected to one end of the impedance adjustment module 216 of controller b. The input terminal of the second converter 204 can be connected to the other end of the impedance adjustment module 216 of controller b through the voltage control module 215 of controller b.

[0064] Using the implementation method provided in this application, the high-frequency impedance and low-frequency impedance of the first multiplier power supply 201 and the second multiplier power supply 202 can be adjusted respectively by the impedance adjustment modules (impedance adjustment module 206 and impedance adjustment module 216) in the two controllers (controller a and controller b), and the output voltage of the first converter 203 and the second converter 204 can be controlled respectively by the voltage control modules (voltage control module 205 and voltage control module 215) in the two controllers, thereby improving the control efficiency of the system.

[0065] In some feasible implementations, the controller may also include a frequency division unit for data acquisition. See also... Figure 4 , Figure 4 This is another structural schematic diagram of the power supply system provided in an embodiment of this application. For example... Figure 4 As shown, one end of the acquisition frequency division unit (e.g., acquisition frequency division unit 307 or acquisition frequency division unit 317) can be connected to the output of the converter (e.g., the output of the first converter 303 or the second converter 304), and the other end of the acquisition frequency division unit (e.g., acquisition frequency division unit 307 or acquisition frequency division unit 317) can be connected to the impedance adjustment module (e.g., impedance adjustment module 306 or impedance adjustment module 316) in the controller (e.g., controller a or controller b) to which the acquisition frequency division unit belongs. The acquisition frequency division unit (e.g., acquisition frequency division unit 307 or acquisition frequency division unit 317) here can be used to acquire the output current value of the target converter (e.g., the output terminal of the first converter 303 or the second converter 304), and divide the output current value to obtain the frequency-divided output current value. A high-frequency current value is determined based on the current component in the frequency-divided output current value with a frequency greater than or equal to the target frequency (e.g., 100Hz), and a low-frequency current value is determined based on the current component in the frequency-divided output current value with a frequency less than the target frequency. The high-frequency and low-frequency current values ​​are used as the output current value of the converter. It can be understood that when the load power consumption is high (e.g., power consumption is high during peak periods), the high-frequency component in the converter's output current is higher. Furthermore, it can be understood that when the load power consumption is stable (e.g., power consumption is low during trough periods), the low-frequency component in the converter's output current is higher.

[0066] Using the implementation method provided in this application, the acquisition frequency division unit (e.g., acquisition frequency division unit 307 or acquisition frequency division unit 317) can determine the high-frequency current value and low-frequency current value output by the target converter (e.g., the output terminal of the first converter 303 or the second converter 304) based on the output current value after frequency division, and transmit the high-frequency current value and low-frequency current value as the output current value of the converter to the voltage control module (e.g., voltage control module 305 or voltage control module 315), thereby improving the control accuracy of the power supply system and further improving the power supply efficiency.

[0067] In some feasible implementations, the voltage control module may include a voltage reference unit and a voltage control unit. See also... Figure 5 , Figure 5 This is another structural schematic diagram of the power supply system provided in an embodiment of this application. For example... Figure 5 As shown, one end of the voltage reference unit (e.g., voltage reference unit 4051 or voltage reference unit 4151) can be connected to the impedance adjustment module (e.g., impedance adjustment module 406 or impedance adjustment module 416) in the controller (e.g., controller a or controller b) to which the voltage reference unit belongs, and the other end of the voltage reference unit can be connected to the converter (e.g., first converter 403 or second converter 404) through the voltage control unit (e.g., voltage control unit 4052 or voltage control unit 4152) in the controller to which the voltage reference unit belongs.

[0068] Here, the voltage reference unit (e.g., voltage reference unit 4051 or voltage reference unit 4151) can generate a high-frequency reference voltage value for the target converter based on the high-frequency current value in the output current value of the target converter (e.g., the first converter 403 or the second converter 404) and the high-frequency impedance of the target converter, and generate a low-frequency reference voltage value for the target converter based on the low-frequency current value in the output current value of the converter and the low-frequency impedance of the target converter. The low-frequency reference voltage value and the high-frequency reference voltage value are then superimposed to obtain the target reference voltage value of the target converter. Here, the voltage control unit (e.g., voltage control unit 4052 or voltage control unit 4152) can be used to generate a reference voltage control signal (e.g., a pulse width modulation signal or other control signal that can control the output voltage of the converter) for the target converter based on the target reference voltage value, and control the output voltage of the converter through the reference voltage control signal.

[0069] Using the embodiments provided in this application, the voltage reference unit (e.g., voltage reference unit 4051 or voltage reference unit 4151) can generate a high-frequency reference voltage value of the target converter based on the high-frequency current value in the output current value of the target converter (e.g., the first converter 403 or the second converter 404) and the high-frequency impedance of the target converter, and generate a low-frequency reference voltage value of the target converter based on the low-frequency current value in the output current value of the converter and the low-frequency impedance of the target converter. The low-frequency reference voltage value and the high-frequency reference voltage value are superimposed to obtain the target reference voltage value of the target converter. The voltage control unit (e.g., voltage control unit 4052 or voltage control unit 4152) can be used to generate a reference voltage control signal (e.g., a pulse width modulation signal or other control signal that can control the output voltage of the converter) of the target converter based on the target reference voltage value, and control the output voltage of the converter through the reference voltage control signal, thereby further improving the power supply efficiency of the power supply system. The structure is simple and the control is convenient.

[0070] Please see also Figure 6 , Figure 6 This is another structural schematic diagram of the power supply system provided in an embodiment of this application. For example... Figure 6 As shown, the power supply system may also include a photovoltaic current source 508 and a third converter 509, with the photovoltaic current source 508 connected to the load via the third converter 509. Among these, Figure 6 The connection method and working principle of the first-rate power supply 501, the second-rate power supply 502, the first converter 503, the second converter 504, controller a (including voltage control module 505 (including voltage reference unit 5051, voltage control unit 5052), impedance adjustment module 506, and acquisition frequency division unit 507) and controller b (including voltage control module 515 (including voltage reference unit 5151, voltage control unit 5152), impedance adjustment module 516, and acquisition frequency division unit 517) are the same as those described above. Figure 5 The connection method and working principle of the first-rate power supply 401, the second-rate power supply 402, the first converter 403, the second converter 404, controller a (including voltage control module 405 (including voltage reference unit 4051, voltage control unit 4052), impedance adjustment module 406, and acquisition frequency division unit 407) and controller b (including voltage control module 415 (including voltage reference unit 4151, voltage control unit 4152), impedance adjustment module 416, and acquisition frequency division unit 417) are the same, and will not be repeated here. Here, the third converter 509 can adjust the output voltage of the photovoltaic current source 508 and use the photovoltaic current source 508 to supply power to the load, further alleviating the power supply pressure of the power supply system. It can be understood that the photovoltaic current source can also be other forms of current source, voltage source, or power generation device.

[0071] Please see Figure 7 , Figure 7 This is another structural schematic diagram of the power supply system provided in an embodiment of this application. For example... Figure 7 As shown, the power supply system may also include a converter circuit 610 (e.g., a power conversion system, PCS), and converters (e.g., a first converter 603, a second converter 604, or a third converter 609) can be connected to the load through the converter circuit 610. Figure 7 The connection method and working principle of the first-rate power supply 601, the second-rate power supply 602, the first converter 603, the second converter 604, controller a (including voltage control module 605 (including voltage reference unit 6051, voltage control unit 6052), impedance adjustment module 606, and acquisition frequency division unit 607), controller b (including voltage control module 615 (including voltage reference unit 6151, voltage control unit 6152), impedance adjustment module 616, and acquisition frequency division unit 617), photovoltaic current source 608, and third converter 609 are the same as those described above. Figure 6 The connection method and working principle of the first-rate power supply 501, second-rate power supply 502, first converter 503, second converter 504, controller a (including voltage control module 505 (including voltage reference unit 5051, voltage control unit 5052), impedance adjustment module 506 and acquisition frequency division unit 507), controller b (including voltage control module 515 (including voltage reference unit 5151, voltage control unit 5152), impedance adjustment module 516 and acquisition frequency division unit 517), photovoltaic current source 508 and third converter 509 are the same, and will not be described again here. The converter circuit 610 here can convert the DC power output by the converter (e.g., the first converter 603, the second converter 604 or the third converter 609) into AC power and transmit it to the load, so that the system can supply power to AC-type loads and improve the adaptability of the system.

[0072] Please see Figure 8 , Figure 8 This is another structural schematic diagram of the power supply system provided in an embodiment of this application. Figure 8 The power supply system shown may also include a DC bus, and converters (e.g., first converter 703, second converter 704, or third converter 709) can be connected to the load via the DC bus and the converter circuit 710. Figure 8The connection method and working principle of the first-rate power supply 701, the second-rate power supply 702, the first converter 703, the second converter 704, controller a (including voltage control module 705 (including voltage reference unit 7051, voltage control unit 7052), impedance adjustment module 706 and acquisition frequency division unit 707), controller b (including voltage control module 715 (including voltage reference unit 7151, voltage control unit 7152), impedance adjustment module 716 and acquisition frequency division unit 717), photovoltaic current source 708, third converter 709 and converter circuit 710 are the same as those described above. Figure 7 The connection method and working principle of the first-rate power supply 601, second-rate power supply 602, first converter 603, second converter 604, controller a (including voltage control module 605 (including voltage reference unit 6051, voltage control unit 6052), impedance adjustment module 606, and acquisition frequency division unit 607), controller b (including voltage control module 615 (including voltage reference unit 6151, voltage control unit 6152), impedance adjustment module 616, and acquisition frequency division unit 617), photovoltaic current source 608, third converter 609, and converter circuit 610 are the same, and will not be repeated here. Here, the DC bus may include one bus capacitor or multiple bus capacitors connected in series, which can be used for energy storage, such as... Figure 8 As shown, the DC bus includes a bus capacitor C. Figure 8 In the power supply system shown, the converter circuit can convert the electrical energy output from the generator and stored across the bus capacitor C, and output corresponding current and voltage to maintain the operation of the power grid. Optionally, in some feasible implementations, such as Figure 8 As shown, the power supply system may also include a combiner box 711, through which multiple converters (e.g., the first converter 703, the second converter 704, or the third converter 709) can be connected in parallel to the combiner box 711, and then connected to the DC bus and / or the converter circuit 710. It can be understood that multiple converters in the power supply system can be connected in parallel to the combiner box 711 and then directly connected to the converter circuit 710 through the combiner box 711, or they can be connected to the DC bus through the combiner box 711 and then connected to the converter circuit 710 through the DC bus. The specific configuration can be determined according to the actual application scenario and is not limited here.

[0073] See Figure 9 , Figure 9 This is another structural schematic diagram of the power supply system provided in an embodiment of this application. For example... Figure 9 As shown, the load of the power supply system may also include a grid connection device 812. The converter circuit 810 can supply power to electrical equipment or power transmission equipment such as transmission lines, power transfer stations, batteries, communication base stations, or household appliances in the load (e.g., the power grid) through the grid connection device 812. Figure 9 The connection methods and working principles of the first-rate power supply 801, second-rate power supply 802, first converter 803, second converter 804, controller a (including voltage control module 805 (including voltage reference unit 8051, voltage control unit 8052), impedance adjustment module 806, and acquisition frequency division unit 807), controller b (including voltage control module 815 (including voltage reference unit 8151, voltage control unit 8152), impedance adjustment module 816, and acquisition frequency division unit 817), photovoltaic current source 808, third converter 809, converter circuit 810, and combiner box 811 are the same as those described above. Figure 8 The connection method and working principle of the first-rate power supply 701, the second-rate power supply 702, the first converter 703, the second converter 704, the controller a (including voltage control module 705 (including voltage reference unit 7051, voltage control unit 7052), impedance adjustment module 706 and acquisition frequency division unit 707), the controller b (including voltage control module 715 (including voltage reference unit 7151, voltage control unit 7152), impedance adjustment module 716 and acquisition frequency division unit 717), the photovoltaic current source 708, the third converter 709, the converter circuit 710 and the combiner box 711 are the same, and will not be described again here.

[0074] In this application, the functional modules of the power supply system are arranged in a variety of flexible ways to adapt to different power supply environments, thereby increasing the diversity of application scenarios and enhancing the adaptability of the power supply system. Meanwhile, in the aforementioned... Figures 1 to 9 In any of the power supply systems shown, the system can utilize power sources with different discharge rates to provide primary power based on fluctuations in the load's energy demand, thereby improving efficiency and reducing costs. For ease of description, the following will use... Figure 2 The structure of the power supply system shown is used to illustrate the power supply method of the power supply system provided in the embodiments of this application.

[0075] Please see Figure 10 , Figure 10 This is a flowchart illustrating the power supply method of the power supply system provided in this application. The power supply method of the power supply system provided in this application is applicable to the above-mentioned... Figures 1 to 9 Any of the power supply systems shown. For example... Figure 10 As shown, the power supply method of the power supply system provided in this application includes the following steps:

[0076] S701: The controller adjusts the impedance of the first converter and / or the second converter based on the frequency fluctuations of the load.

[0077] S702: The controller adjusts the output voltage of the first converter and / or the second converter based on the impedance of the first converter and / or the second converter.

[0078] In the embodiments provided in this application, the power supply system may include two power sources with different discharge rates (e.g., a first-rate power source and a second-rate power source). Here, the first-rate power source may be a power source with a discharge rate greater than or equal to a target discharge rate (e.g., 0.4C) (e.g., a power source with a high discharge rate such as a lithium battery), and the second-rate power source may be a power source with a discharge rate less than the target discharge rate (e.g., a power source with a low discharge rate such as a lead-acid battery or a lead-carbon battery). Here, the frequency fluctuation of the load may be a change in the output power of the power supply system to the load or a change in the output current of the power supply system to the load. In the power supply system, the frequency fluctuation of the load can represent the state of power consumption at the load end. When the power consumption of the load is large (e.g., the power consumption is high during peak periods), the controller can control the first-rate power source to provide the main power supply; when the power consumption at the load end is stable (e.g., the power consumption is low during trough periods), the controller can control the second-rate power source to provide the main power supply. Here, the controller can adjust the impedance of the first converter and / or the second converter based on the frequency fluctuations of the load, and adjust the output voltage of the corresponding converter (e.g., the first converter and / or the second converter) based on the impedance of the first converter and / or the second converter, so as to adjust the output power of the first-rate power supply and / or the second-rate power supply according to the different frequency fluctuations of different loads. It can be understood that when the frequency fluctuations of the load (e.g., changes in the output power of the power supply system to the load or changes in the output current of the power supply system to the load) indicate that the power consumption of the load is large (e.g., the power consumption is high during peak periods), the controller can adjust the impedance of the first converter, and thus adjust the output voltage of the first converter, so as to control the first-rate power supply to supply power to the load with high-frequency fluctuations (e.g., the load with high power consumption). It can also be understood that when the frequency fluctuation of the load (e.g., changes in the output power or output current of the power supply system to the load) indicates that the power consumption of the load is relatively stable (e.g., the power consumption is low during periods of low power consumption), such as when the load fluctuation in the low-frequency range (e.g., the frequency fluctuation of the load in the range of less than 100Hz) is greater than the low-frequency fluctuation threshold, the controller can determine that the load is a low-frequency load. At this time, the controller can adjust the impedance of the second converter, and then adjust the output voltage of the second converter to control the second-rate power supply to supply power to the low-frequency fluctuating load (e.g., the load with low power consumption).

[0079] Using the implementation method provided in this application, the controller can control the impedance of different discharge converters and the output voltage of different converters based on the fluctuation of power demand at the load end. Thus, when the power consumption at the load end is large (e.g., the power consumption is high during peak periods), the power supply with a higher discharge rate (e.g., a first-rate power supply) is used for the main power supply, and when the power consumption at the load end is stable (e.g., the power consumption is low during trough periods), the power supply with a lower discharge rate (e.g., a second-rate power supply) is used for the main power supply, thereby improving power supply efficiency and reducing power supply costs.

[0080] In some feasible implementations, the load includes high-frequency loads and low-frequency loads. Before executing step S701, the controller adjusts the impedance of the first converter and / or the second converter based on the frequency fluctuations of the load, the method further includes: the controller determining whether the load is a high-frequency load or a low-frequency load based on the frequency fluctuations of the load. When the power consumption of the load is large (e.g., power consumption is high during peak periods), such as when the fluctuation of the load in the high-frequency range (e.g., the frequency fluctuation of the load in the range of frequencies greater than or equal to 100Hz) is greater than the high-frequency fluctuation threshold, the load can be determined to be a high-frequency load; when the power consumption at the load end is stable (e.g., power consumption is low during trough periods), such as when the fluctuation of the load in the low-frequency range (e.g., the frequency fluctuation of the load in the range of frequencies less than 100Hz) is greater than the low-frequency fluctuation threshold, the load can be determined to be a low-frequency load. It is understandable that when the load's power consumption is high (e.g., power consumption is high during peak periods), such as when the load's fluctuations in the high-frequency range (e.g., frequency fluctuations in the range of 100Hz or higher) exceed the high-frequency fluctuation threshold, the controller can determine that the load is a high-frequency load. In this case, the controller can adjust the impedance of the first converter, thereby adjusting the output voltage of the first converter, to control the first-rate power supply to power the high-frequency fluctuating load (e.g., the load with high power consumption). Similarly, it is understandable that when the load's power consumption is relatively stable (e.g., power consumption is low during trough periods), the load's low-frequency fluctuations are large. For example, when the load's fluctuations in the low-frequency range (e.g., frequency fluctuations in the range of less than 100Hz) exceed the low-frequency fluctuation threshold, the controller can determine that the load is a low-frequency load. In this case, the controller can adjust the impedance of the second converter, thereby adjusting the output voltage of the second converter, to control the second-rate power supply to power the low-frequency fluctuating load (e.g., the load with low power consumption).

[0081] In some feasible implementations, the frequency fluctuations of the load include high-frequency fluctuations and / or low-frequency fluctuations of the load. Step S701, in which the controller adjusts the impedance of the first converter and / or the second converter based on the frequency fluctuations of the load, includes: the controller adjusting the high-frequency impedance of the first converter to a first high-frequency impedance based on the high-frequency fluctuations of the load, and adjusting the output voltage of the first converter based on the impedance of the first converter, to control a first-rate power supply to supply power to the load with high-frequency fluctuations, wherein the first high-frequency impedance is less than the second high-frequency impedance, and the second high-frequency impedance is the high-frequency impedance of the second converter. The controller adjusts the low-frequency impedance of the second converter to a second low-frequency impedance based on the low-frequency fluctuations of the load, and adjusts the output voltage of the second converter based on the impedance of the second converter, so as to control the second-rate power supply to supply power to the load with low-frequency fluctuations. It is understood that the second low-frequency impedance is less than the first low-frequency impedance. When the power consumption of the load is large (for example, the power consumption is high during the peak period), such as when the fluctuation of the load in the high-frequency range (for example, the frequency fluctuation of the load in the range of frequency greater than or equal to 100Hz) is greater than the high-frequency fluctuation threshold, the controller can determine that the load is a high-frequency load. At this time, the controller can reduce the impedance of the first converter and adjust the output voltage of the first converter to increase the output power of the first-rate power supply, and control the first-rate power supply to supply power to the load with high-frequency fluctuations (for example, the load with high power consumption). It can also be understood that when the load's power consumption is relatively stable (e.g., power consumption is low during periods of low power consumption), the load's low-frequency fluctuations are large. For example, when the load's fluctuations in the low-frequency range (e.g., the load's frequency fluctuations in the range of frequencies less than 100Hz) exceed the low-frequency fluctuation threshold, the controller can determine that the load is a low-frequency load. At this time, the controller can reduce the impedance of the second converter and adjust the output voltage of the second converter to increase the output power of the second-rate power supply and control the second-rate power supply to supply power to the low-frequency fluctuating load (e.g., the load with low power consumption).

[0082] It is understandable that the load here can exhibit characteristics of both high-frequency and low-frequency loads. For example, some loads require a large amount of power and need to be powered by a power supply with a high discharge rate, while other loads require a more stable amount of power and can be powered by a power supply with a low discharge rate. In this case, the controller can control the high-frequency impedance and / or low-frequency impedance of the converter separately, and accordingly change the output voltage of the converter, thereby adjusting the output power of different power supplies.

[0083] In some feasible implementations, the controller includes an impedance regulation module and a voltage control module. Step S701, adjusting the impedance of the first converter and / or the second converter based on the load frequency fluctuation, may include: the impedance regulation module acquiring the load frequency fluctuation and adjusting the high-frequency impedance and / or low-frequency impedance of the target converter based on the load frequency fluctuation, wherein the target converter includes the first converter and / or the second converter. Step S702, adjusting the output voltage of the first converter and / or the second converter based on the impedance of the first converter and / or the second converter, may include: the voltage control module controlling the output voltage of the converter based on the high-frequency impedance and low-frequency impedance of the target converter.

[0084] Using the embodiments provided in this application, the impedance adjustment module can acquire the frequency fluctuation of the load and adjust the high-frequency impedance and / or low-frequency impedance of the target converter. The voltage control module can adjust the output voltage of the corresponding converter (e.g., the first converter and / or the second converter) to control the power supply with different discharge rates to supply power to the load with different frequency fluctuations. The structure is simple, the control is convenient, the power supply efficiency is improved, and the power supply cost is reduced.

[0085] In some feasible implementations, the aforementioned step of the impedance adjustment module acquiring the frequency fluctuation of the load and adjusting the high-frequency impedance and / or low-frequency impedance of the target converter based on the load frequency fluctuation may include: the impedance adjustment module acquiring the output voltage and output current values ​​of the converter, acquiring the frequency fluctuation of the load based on the output voltage and output current values, and adjusting the high-frequency impedance and / or low-frequency impedance of the target converter based on the load frequency fluctuation. Here, the target converter includes a first converter and / or a second converter, wherein the first high-frequency impedance is less than the first low-frequency impedance and less than the second high-frequency impedance, and the second low-frequency impedance is less than the second high-frequency impedance and less than the first low-frequency impedance.

[0086] In a power supply system, an impedance regulation module can acquire the output voltage and output current values ​​of a target converter (e.g., a first converter or a second converter), determine the high-frequency fluctuations (e.g., frequency fluctuations of the load within a frequency range greater than or equal to 100Hz) and / or low-frequency fluctuations (e.g., frequency fluctuations of the load within a frequency range less than 100Hz) of the load based on these values, and adjust the high-frequency impedance and / or low-frequency impedance of the target converter (e.g., a first high-frequency impedance and / or a first low-frequency impedance, a second high-frequency impedance and / or a second low-frequency impedance) based on these load frequency fluctuations. Here, the high-frequency impedance can be the impedance corresponding to an output current value (or output voltage value) with a frequency greater than or equal to 100Hz, and the low-frequency impedance can be the impedance corresponding to an output current value (or output voltage value) with a frequency less than 100Hz. Here, the first high-frequency impedance is less than the first low-frequency impedance and less than the second high-frequency impedance, and the second low-frequency impedance is less than the second high-frequency impedance and less than the first low-frequency impedance. The voltage control module generates a reference voltage control signal for the target converter based on the converter's output current value, the target converter's high-frequency impedance, and the target converter's low-frequency impedance. It then controls the converter's output voltage using this reference voltage control signal. It can be understood that when the load's power consumption is high (e.g., during peak periods), the high-frequency component of the converter's output current is higher. Since the first high-frequency impedance corresponding to the first-rate power supply is lower than the second high-frequency impedance corresponding to the second-rate power supply, the output power of the first-rate power supply is greater than the output power of the second-rate power supply. In other words, the first-rate power supply primarily powers the load in this situation. Furthermore, it can be understood that when the load's power consumption is stable (e.g., during trough periods), the low-frequency component of the converter's output current is higher. Since the second low-frequency impedance corresponding to the second-rate power supply is lower than the first low-frequency impedance corresponding to the first-rate power supply, the output power of the second-rate power supply is greater than the output power of the first-rate power supply. In other words, the second-rate power supply primarily powers the load in this situation.

[0087] By adopting the implementation method provided in this application, the power demand fluctuation of the load can be judged by the output voltage and output current values ​​of the converter, and different impedance adjustments can be made to the converters connected to power supplies with different discharge rates. Thus, when the power consumption at the load is large (e.g., the power consumption is high during peak periods), the power supply with a higher discharge rate (e.g., the first rate power supply) is used for the main power supply, and when the power consumption at the load is stable (e.g., the power consumption is low during trough periods), the power supply with a lower discharge rate (e.g., the second rate power supply) is used for the main power supply, thereby improving power supply efficiency and reducing power supply costs.

[0088] In some feasible implementations, after the impedance adjustment module obtains the output voltage and output current values ​​of the converter in the aforementioned steps, the method may further include: the impedance adjustment module determining the load impedance based on the output voltage and output current values ​​of the converter, and adjusting the high-frequency impedance and / or low-frequency impedance of the target converter based on the load impedance. Here, the first low-frequency impedance is less than or equal to the load impedance, and the second high-frequency impedance is less than or equal to the load impedance. In the embodiments provided in this application, when a change in the load impedance causes fluctuations in the power consumption at the load end, the impedance adjustment module may further determine the load impedance based on the output voltage and output current values ​​of the converter, and adjust the high-frequency impedance and / or low-frequency impedance of the target converter based on the load impedance, so that the power supply system matches the load impedance, further improving the power supply efficiency of the power supply system and reducing the power supply cost.

[0089] In some feasible implementations, the controller further includes a frequency division unit. After the impedance adjustment module acquires the output voltage and output current values ​​of the converter in the aforementioned steps, the method may further include: the frequency division unit acquires the output current value of the converter, and divides the output current value by frequency to obtain a frequency-divided output current value; determining a high-frequency current value based on the current component in the frequency-divided output current value with a frequency greater than or equal to the target frequency; determining a low-frequency current value based on the current component in the frequency-divided output current value with a frequency less than the target frequency; and using the high-frequency current value and the low-frequency current value as the output current value of the converter. It can be understood that when the load's power consumption is high (e.g., power consumption is high during peak periods), the high-frequency component in the converter's output current is higher. It can also be understood that when the load's power consumption is stable (e.g., power consumption is low during trough periods), the low-frequency component in the converter's output current is higher. Using the implementation method provided in this application, the frequency division unit can determine the high-frequency current value and low-frequency current value of the converter output based on the output current value after frequency division, and transmit the high-frequency current value and low-frequency current value as the output current value of the converter to the voltage control module, thereby improving the control accuracy of the power supply system and further improving the power supply efficiency.

[0090] In some feasible implementations, the voltage control module includes a voltage reference unit and a voltage control unit. In the aforementioned steps, the voltage control module controls the output voltage of the converter based on the high-frequency impedance and low-frequency impedance of the target converter. This can include: the voltage reference unit generating a high-frequency reference voltage value for the target converter based on the high-frequency current value in the converter's output current value and the high-frequency impedance of the target converter, and generating a low-frequency reference voltage value for the target converter based on the low-frequency current value in the converter's output current value and the low-frequency impedance of the target converter; and superimposing the low-frequency reference voltage value and the high-frequency reference voltage value to obtain the target reference voltage value of the target converter. The voltage control unit generates a reference voltage control signal for the target converter based on the target reference voltage value, and controls the output voltage of the converter through the reference voltage control signal. Using the implementation method provided in this application, the voltage reference unit can generate a high-frequency reference voltage value of the target converter based on the high-frequency current value in the output current value of the converter and the high-frequency impedance of the target converter, and generate a low-frequency reference voltage value of the target converter based on the low-frequency current value in the output current value of the converter and the low-frequency impedance of the target converter. The low-frequency reference voltage value and the high-frequency reference voltage value are superimposed to obtain the target reference voltage value of the target converter, which further improves the power supply efficiency of the power supply system. The structure is simple and the control is convenient.

[0091] In this application, the power supply system can determine the fluctuations in the power demand at the load end by measuring the output voltage and current values ​​of the converter. It then adjusts the impedance of converters connected to power supplies with different discharge rates differently. Thus, when the power consumption at the load end is high (e.g., during peak periods), the power supply with a higher discharge rate (e.g., the first discharge rate power supply) provides the main power supply. Conversely, when the power consumption at the load end is stable (e.g., during trough periods), the power supply with a lower discharge rate (e.g., the second discharge rate power supply) provides the main power supply, thereby improving power supply efficiency and reducing power supply costs. It is understood that in other application scenarios (e.g., different electricity prices or other conditions), the solution provided in this application can also be used to control the output power of two power supplies, allowing one power supply to provide the main power supply. These solutions are not fundamentally different from the solution protected by this invention and also fall within the scope of protection covered by this application.

[0092] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A power supply system, characterized in that, The power supply system includes a first-rate power supply, a second-rate power supply, a first converter, a second converter, and at least one controller; the first-rate power supply is used to connect to the load through the first converter, the second-rate power supply is used to connect to the load through the second converter, and the discharge rate of the first-rate power supply is greater than or equal to the discharge rate of the second-rate power supply. The controller includes an impedance adjustment module and a voltage control module. The output terminal of the first converter is connected to one end of the impedance adjustment module, and the input terminal of the first converter is connected to the other end of the impedance adjustment module through the voltage control module. The output terminal of the second converter is connected to one end of the impedance adjustment module, and the input terminal of the second converter is connected to the other end of the impedance adjustment module through the voltage control module. The impedance adjustment module is used to acquire the frequency fluctuation of the load, determine whether the load is a high-frequency load or a low-frequency load based on the frequency fluctuation of the load, and adjust the high-frequency impedance of the target converter and / or the low-frequency impedance of the target converter based on the frequency fluctuation of the load. The target converter includes the first converter and / or the second converter. The voltage control module is used to control the output voltage of the target converter based on the high-frequency impedance and the low-frequency impedance of the target converter, so as to adjust the output power of the first multiplier power supply and / or the second multiplier power supply according to the different frequency fluctuations of different loads. The frequency fluctuation of the load is the change in the output power output from the power supply system to the load or the change in the output current output from the power supply system to the load. The different loads are the high-frequency load or the low-frequency load.

2. The power supply system according to claim 1, characterized in that, The impedance adjustment module is further configured to reduce the high-frequency impedance of the first converter to a first high-frequency impedance when the load is the high-frequency load; the voltage control module is further configured to adjust the output voltage of the first converter based on the impedance of the first converter to increase the output power of the first multiplier power supply, wherein the first high-frequency impedance is less than the second high-frequency impedance, and the second high-frequency impedance is the high-frequency impedance of the second converter. The impedance adjustment module is further configured to reduce the low-frequency impedance of the second converter to a second low-frequency impedance when the load is the low-frequency load; the voltage control module is further configured to adjust the output voltage of the second converter based on the impedance of the second converter to increase the output power of the second multiplier power supply, wherein the second low-frequency impedance is less than the first low-frequency impedance, and the first low-frequency impedance is the low-frequency impedance of the first converter.

3. The power supply system according to claim 2, characterized in that, The impedance adjustment module is used to obtain the output voltage and output current values ​​of the first converter and / or the second converter, obtain the frequency fluctuation of the load based on the output voltage and output current values, and adjust the high-frequency impedance and / or the low-frequency impedance of the target converter based on the frequency fluctuation of the load, wherein the first high-frequency impedance is less than the first low-frequency impedance and less than the second high-frequency impedance, and the second low-frequency impedance is less than the second high-frequency impedance and less than the first low-frequency impedance.

4. The power supply system according to claim 3, characterized in that, The power supply system includes two controllers. The output terminal of the first converter is connected to one end of the impedance regulation module of one of the two controllers. The input terminal of the first converter is connected to the other end of the impedance regulation module of the first controller through the voltage control module of the first controller. The output terminal of the second converter is connected to one end of the impedance regulation module of the other of the two controllers. The input terminal of the second converter is connected to the other end of the impedance regulation module of the other controller through the voltage control module of the other controller.

5. The power supply system according to claim 4, characterized in that, The impedance adjustment module is further configured to determine the impedance of the load based on the output voltage value and the output current value, and adjust the high-frequency impedance and / or the low-frequency impedance of the target converter based on the impedance of the load, wherein the first low-frequency impedance is less than or equal to the impedance of the load, and the second high-frequency impedance is less than or equal to the impedance of the load.

6. The power supply system according to claim 5, characterized in that, The controller also includes a frequency division acquisition unit; One end of the acquisition frequency division unit is connected to the output terminal of the first converter and / or the output terminal of the second converter, and the other end of the acquisition frequency division unit is connected to the impedance adjustment module in the controller to which the acquisition frequency division unit belongs; The acquisition and frequency division unit is used to acquire the output current value, divide the output current value by frequency to obtain the frequency-divided output current value, determine the high-frequency current value based on the current component in the frequency-divided output current value with a frequency greater than or equal to the target frequency, determine the low-frequency current value based on the current component in the frequency-divided output current value with a frequency less than the target frequency, and use the high-frequency current value and the low-frequency current value as the output current value of the first converter and / or the second converter.

7. The power supply system according to claim 6, characterized in that, The voltage control module includes a voltage reference unit and a voltage control unit; One end of the voltage reference unit is connected to the impedance adjustment module in the controller to which the voltage reference unit belongs, and the other end of the voltage reference unit is connected to the first converter and / or the second converter through the voltage control unit in the controller to which the voltage reference unit belongs. The voltage reference unit is used to generate a high-frequency reference voltage value of the target converter based on the high-frequency current value and the high-frequency impedance of the target converter, and to generate a low-frequency reference voltage value of the target converter based on the low-frequency current value and the low-frequency impedance of the target converter. The low-frequency reference voltage value and the high-frequency reference voltage value are superimposed to obtain the target reference voltage value of the target converter. The voltage control unit is used to generate a reference voltage control signal for the target converter based on the target reference voltage value, and to control the output voltage of the target converter through the reference voltage control signal.

8. The power supply system according to any one of claims 1-7, characterized in that, The power supply system also includes a photovoltaic current source and a third converter, wherein the photovoltaic current source is connected to the load through the third converter.

9. The power supply system according to claim 8, characterized in that, The power supply system further includes a converter circuit, through which the first converter, the second converter, or the third converter is connected to the load.

10. The power supply system according to claim 9, characterized in that, The power supply system also includes a combiner box, through which the first converter, the second converter, or the third converter is connected to the converter circuit.

11. The power supply system according to claim 10, characterized in that, The power supply system also includes a DC bus, and the first converter, the second converter, or the third converter is connected to the DC bus through the combiner box, and the DC bus is connected to the converter circuit.

12. The power supply system according to claim 11, characterized in that, The power supply system also includes a grid connection device, through which the converter circuit is connected to the load.

13. A power supply method for a power supply system, characterized in that, The power supply method is applicable to the power supply system as described in any one of claims 1-12, the controller includes an impedance adjustment module and a voltage control module, and the method includes: The impedance adjustment module acquires the frequency fluctuation of the load, determines whether the load is a high-frequency load or a low-frequency load based on the frequency fluctuation of the load, and adjusts the high-frequency impedance of the target converter and / or the low-frequency impedance of the target converter based on the frequency fluctuation of the load. The target converter includes the first converter and / or the second converter. The voltage control module controls the output voltage of the target converter based on the high-frequency impedance and low-frequency impedance of the target converter, so as to adjust the output power of the first multiplier power supply and / or the second multiplier power supply according to the different frequency fluctuations of different loads. The frequency fluctuation of the load is the change in the output power output from the power supply system to the load or the change in the output current output from the power supply system to the load. The different loads are the high-frequency load or the low-frequency load.

14. The power supply method according to claim 13, characterized in that, The impedance adjustment module acquires the frequency fluctuation of the load and adjusts the high-frequency impedance and / or the low-frequency impedance of the target converter based on the frequency fluctuation of the load, including: When the load is a high-frequency load, the impedance adjustment module reduces the high-frequency impedance of the first converter to a first high-frequency impedance, and the voltage control module adjusts the output voltage of the first converter based on the impedance of the first converter to increase the output power of the first multiplier power supply. The first high-frequency impedance is less than the second high-frequency impedance, and the second high-frequency impedance is the high-frequency impedance of the second converter. When the load is a low-frequency load, the impedance adjustment module reduces the low-frequency impedance of the second converter to a second low-frequency impedance, and the voltage control module adjusts the output voltage of the second converter based on the impedance of the second converter to increase the output power of the second multiplier power supply. The second low-frequency impedance is less than the first low-frequency impedance, and the first low-frequency impedance is the low-frequency impedance of the first converter.

15. The power supply method according to claim 14, characterized in that, The impedance adjustment module acquires the frequency fluctuation of the load, determines whether the load is a high-frequency load or a low-frequency load based on the frequency fluctuation, and adjusts the high-frequency impedance and / or the low-frequency impedance of the target converter based on the frequency fluctuation of the load, including: The impedance adjustment module acquires the output voltage and output current values ​​of the first converter and / or the second converter, acquires the frequency fluctuation of the load based on the output voltage and output current values, determines whether the load is a high-frequency load or a low-frequency load based on the frequency fluctuation of the load, and adjusts the high-frequency impedance and / or the low-frequency impedance of the target converter based on the frequency fluctuation of the load, wherein the first high-frequency impedance is less than the first low-frequency impedance and less than the second high-frequency impedance, and the second low-frequency impedance is less than the second high-frequency impedance and less than the first low-frequency impedance.

16. The power supply method according to claim 15, characterized in that, After the impedance adjustment module obtains the output voltage and output current values ​​of the first converter and / or the second converter, the method further includes: The impedance adjustment module determines the impedance of the load based on the output voltage value and the output current value, and adjusts the high-frequency impedance and / or low-frequency impedance of the target converter based on the impedance of the load, wherein the first low-frequency impedance is less than or equal to the impedance of the load, and the second high-frequency impedance is less than or equal to the impedance of the load.

17. The power supply method according to claim 16, characterized in that, The controller further includes a frequency division acquisition unit. After the impedance adjustment module acquires the output voltage and output current values ​​of the converter, the method further includes: The acquisition and frequency division unit acquires the output current value and divides the output current value to obtain a frequency-divided output current value. Based on the current components in the frequency-divided output current value with frequencies greater than or equal to the target frequency, a high-frequency current value is determined. Based on the current components in the frequency-divided output current value with frequencies less than the target frequency, a low-frequency current value is determined. The high-frequency current value and the low-frequency current value are used as the output current values ​​of the first converter and / or the second converter.

18. The power supply method according to claim 17, characterized in that, The voltage control module includes a voltage reference unit and a voltage control unit. The voltage control module controls the output voltage of the target converter based on the high-frequency impedance and low-frequency impedance of the target converter, including: The voltage reference unit generates a high-frequency reference voltage value for the target converter based on the high-frequency current value and the high-frequency impedance of the target converter, and generates a low-frequency reference voltage value for the target converter based on the low-frequency current value and the low-frequency impedance of the target converter. The low-frequency reference voltage value and the high-frequency reference voltage value are then superimposed to obtain the target reference voltage value of the target converter. The voltage control unit generates a reference voltage control signal for the target converter based on the target reference voltage value, and controls the output voltage of the target converter through the reference voltage control signal.

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