Optical storage inverter control method, device, system and electronic equipment

Abstract

The application discloses a kind of light storage inverter control method, device, system and electronic equipment, it is related to photovoltaic technical field.The method comprises: obtaining the first power of photovoltaic array in current control period;According to the first power and the target power of photovoltaic array, obtain the first target voltage;The maximum in first target voltage, second target voltage is as the target voltage of photovoltaic array, and according to the target voltage of photovoltaic array, the light storage inverter of photovoltaic array is controlled, wherein, second target voltage is the voltage obtained according to the maximum power of photovoltaic array.Thereby, the actual power of photovoltaic array is flexibly adjusted.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and in particular to a photovoltaic-energy storage inverter control method, device, system, and electronic equipment. Background Technology

[0002] With the rapid development of renewable energy, photovoltaic (PV) power generation systems have become a research hotspot due to their clean and sustainable characteristics, and integrated PV-storage systems have become an important component of new power systems. In PV-storage systems, not only are PV-storage inverters required to efficiently extract energy from the PV array, but they also need to respond to instructions from grid dispatch or energy storage management systems, automatically adjusting output power to maintain system power balance and participate in grid dispatch.

[0003] Because the power generation of photovoltaic arrays relies on the underlying algorithm of MPPT (Maximum Power Point Tracking), which generates power based on the maximum power point affected by factors such as light intensity, temperature, and environmental changes, related technologies often use obstructions (such as cleaning robots) to shade the photovoltaic array and reduce the actual area of ​​sunlight received by the photovoltaic panels in order to adjust the output power. Related technologies also involve determining a lower limit for the inverter's output power. If the target output power of the photovoltaic system is less than the lower limit of the inverter's output power, the output power of the photovoltaic system is determined based on the target output power; if the target output power is not less than the lower limit, the output power of the inverter is determined based on the target output power.

[0004] However, the methods in the relevant technologies lack flexibility and are difficult to meet the grid-side dispatching requirements. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a photovoltaic-storage inverter control method to achieve flexible photovoltaic array power regulation.

[0006] The second objective of this invention is to provide an electronic device.

[0007] The third objective of this invention is to provide a control device for a photovoltaic-storage inverter.

[0008] The fourth objective of this invention is to provide a control system for a photovoltaic-storage inverter.

[0009] To achieve the above objectives, a first aspect of the present invention provides a photovoltaic-storage inverter control method, the method comprising: obtaining a first power of a photovoltaic array in a current control cycle; obtaining a first target voltage based on the first power and a target power of the photovoltaic array; controlling the photovoltaic-storage inverter of the photovoltaic array based on one of the first target voltage and a second target voltage, wherein the second target voltage is a voltage obtained based on the maximum power of the photovoltaic array; the step of controlling the photovoltaic-storage inverter of the photovoltaic array based on one of the first target voltage and the second target voltage comprises: using the maximum value of the first target voltage and the second target voltage as the target voltage of the photovoltaic array, and controlling the photovoltaic-storage inverter of the photovoltaic array based on the target voltage of the photovoltaic array.

[0010] In addition, the photovoltaic-storage inverter control method according to embodiments of the present invention may also have the following additional technical features: According to one embodiment of the present invention, obtaining the first target voltage based on the first power and the target power of the photovoltaic array includes: obtaining a first power error value based on the first power and the target power; performing a proportional-integral operation on the first power error value, and obtaining the first target voltage based on the operation result.

[0011] According to one embodiment of the present invention, before controlling the photovoltaic array inverter of the photovoltaic array according to the target voltage of the photovoltaic array, the method further includes: obtaining a current limit value based on the photovoltaic voltage of the photovoltaic array and the target power; the step of controlling the photovoltaic array inverter of the photovoltaic array according to the target voltage of the photovoltaic array includes: obtaining a target current of the photovoltaic array based on the target voltage; and controlling the photovoltaic array inverter based on the minimum value of the target current and the current limit value.

[0012] According to one embodiment of the present invention, the method further includes: when the first target voltage is greater than the second target voltage, setting the value of the preset flag bit to a preset value.

[0013] According to one embodiment of the present invention, the method for obtaining the second target voltage includes: if the value of a preset flag bit is not a preset value, or if the target power of the current control cycle is inconsistent with the target power of the previous control cycle, the second target voltage is obtained based on the maximum power; if the value of the preset flag bit is the preset value, and the target power of the current control cycle is consistent with the target power of the previous control cycle, a fourth target voltage is used as the second target voltage, wherein the fourth target voltage is the second target voltage in the previous control cycle.

[0014] According to one embodiment of the present invention, obtaining the second target voltage based on the maximum power includes: obtaining a second power error value based on the first power and the maximum power corresponding to the current control cycle; obtaining a third power error value based on the first power and the second power of the photovoltaic array in the previous control cycle; and obtaining a voltage change value based on the photovoltaic voltage of the photovoltaic array in the current control cycle and the previous control cycle; wherein the absolute value of the second power error value is greater than or equal to an error threshold, or the absolute value of the voltage change value is greater than or equal to a change threshold, and the second target voltage is obtained based on the third power error value and the voltage change value; wherein the absolute value of the second power error value is less than the error threshold, and the absolute value of the voltage change value is less than the change threshold, and the second target voltage is obtained based on the third power error value, the voltage change value, and the photovoltaic voltage of the photovoltaic array in the current control cycle.

[0015] To achieve the above objectives, a second aspect of the present invention provides an electronic device including a memory, a processor, and a computer program stored in the memory and running on the processor. When the computer program is executed by the processor, it implements the above-described photovoltaic-storage inverter control method.

[0016] To achieve the above objectives, a third aspect of the present invention provides a photovoltaic-storage inverter control device, comprising: an acquisition module, configured to acquire a first power of a photovoltaic array in the current control cycle, and obtain a first target voltage based on the first power and a target power of the photovoltaic array; a control module, configured to control the photovoltaic-storage inverter of the photovoltaic array based on one of the first target voltage and a second target voltage, wherein the second target voltage is a voltage obtained based on the maximum power of the photovoltaic array; specifically, the control module is configured to: use the maximum value of the first target voltage and the second target voltage as the target voltage of the photovoltaic array, and control the photovoltaic-storage inverter of the photovoltaic array based on the target voltage of the photovoltaic array.

[0017] To achieve the above objectives, a fourth aspect of the present invention provides a photovoltaic-storage inverter control system, including the aforementioned photovoltaic-storage inverter control device.

[0018] According to embodiments of the present invention, a photovoltaic-storage inverter control method, apparatus, system, and electronic device acquire a first power of the photovoltaic array in the current control cycle; obtain a first target voltage based on the first power and the target power of the photovoltaic array; and control the photovoltaic-storage inverter of the photovoltaic array based on one of the first target voltage and a second target voltage, wherein the second target voltage is a voltage obtained based on the maximum power of the photovoltaic array. Thus, by obtaining the first target voltage based on the target power and the second target voltage based on the maximum power, and then controlling the photovoltaic-storage inverter based on one of the first and second target voltages, the power of the photovoltaic array can track the target power. Furthermore, the operating mode of the photovoltaic array can be switched between MPPT (Maximum Power Point Tracking) and target power limitation, avoiding problems in adjusting the actual power of the photovoltaic array due to the target power exceeding the actual power. This achieves flexible adjustment of the actual power of the photovoltaic array to meet the grid-side dispatch requirements.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a flowchart of the photovoltaic-storage inverter control method according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating the calculation of the first target voltage according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a photovoltaic array operating in a state where the target power limits the photovoltaic array, as an example of the present invention. Figure 4 This is a schematic diagram of a photovoltaic array operating in MPPT state, as an example of the present invention; Figure 5 This is a schematic diagram of a photovoltaic array operating in MPPT state, which is another example of the present invention; Figure 6 This is a schematic diagram of another example of the present invention, showing a photovoltaic array operating in a state where the target power limits the photovoltaic array; Figure 7 This is a flowchart illustrating the calculation of the voltage regulation value according to an embodiment of the present invention; Figure 8 This is a flowchart illustrating the calculation of the third power error value and voltage change value according to an embodiment of the present invention; Figure 9 This is a flowchart of a photovoltaic-storage inverter drive according to an embodiment of the present invention; Figure 10 This is a schematic diagram of a photovoltaic-storage inverter drive according to an embodiment of the present invention; Figure 11 This is a structural block diagram of an electronic device according to an embodiment of the present invention; Figure 12 This is a structural block diagram of the photovoltaic-storage inverter control device according to an embodiment of the present invention; Figure 13 This is a structural block diagram of the photovoltaic-storage inverter control system according to an embodiment of the present invention. Detailed Implementation

[0021] The following description, with reference to the accompanying drawings, outlines a photovoltaic-storage inverter control method, apparatus, system, and electronic equipment according to embodiments of the present invention. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described with reference to the accompanying drawings are exemplary and should not be construed as limiting the present invention.

[0022] Figure 1 This is a flowchart of the photovoltaic-storage inverter control method according to an embodiment of the present invention.

[0023] like Figure 1 As shown, the control method for a photovoltaic-storage inverter includes: S11, obtain the first power of the photovoltaic array in the current control cycle.

[0024] Specifically, the photovoltaic voltage and current of the photovoltaic array are acquired at preset time intervals. After acquiring the photovoltaic voltage and current, the photovoltaic power is obtained by multiplying the photovoltaic voltage and current.

[0025] The time between any two adjacent moments of acquiring photovoltaic voltage and current is one control cycle of the photovoltaic array. The photovoltaic power obtained based on the photovoltaic voltage and current acquired at the beginning of the current control cycle is the first power mentioned above. The photovoltaic voltage acquired at the beginning of the current control cycle is the photovoltaic voltage of the current control cycle, and the current acquired at the beginning of the current control cycle is the current of the current control cycle.

[0026] For a given control cycle, the photovoltaic voltage and current acquired at the beginning of the control cycle are the photovoltaic voltage and current for that control cycle, and the power calculated based on the photovoltaic voltage and current is the power for that control cycle.

[0027] The photovoltaic voltage and current of the photovoltaic array can be obtained through high-precision ADC sampling.

[0028] It should be noted that since a photovoltaic array has more than one photovoltaic cell, the photovoltaic voltage mentioned above refers to the average photovoltaic voltage of all photovoltaic cells in a photovoltaic array at the beginning of the control cycle, and the current mentioned above refers to the average current of all photovoltaic cells in a photovoltaic array at the beginning of the control cycle.

[0029] S12, the first target voltage is obtained based on the first power and the target power of the photovoltaic array.

[0030] The target power mentioned above is the power obtained based on factors such as grid dispatch and energy storage management system instructions.

[0031] The above-mentioned method of obtaining the first target voltage based on the first power and the target power of the photovoltaic array may include: obtaining a first power error value based on the first power and the target power; performing a proportional-integral operation on the first power error value; and obtaining the first target voltage based on the operation result.

[0032] Specifically, a power loop control module can be set in the controller, which includes a PI controller.

[0033] First, the first power error value is obtained according to the following formula: , , in, This is the first power error value. For the target power, For first power, The photovoltaic voltage for the current control cycle. This represents the current during the current control cycle.

[0034] See afterward. Figure 2 The first power error value The voltage is fed into the PI controller, and the second voltage regulation value is obtained according to the following formula: , Wherein, ΔU is the second voltage adjustment value. This is the proportionality coefficient. is the integral coefficient.

[0035] After obtaining the second voltage regulation value ΔU, add the photovoltaic voltage to the second voltage regulation value ΔU. The first target voltage is obtained. Furthermore, it can also limit the amplitude of the addition result.

[0036] Therefore, it is possible to obtain the first target voltage based on the actual power and target power of the photovoltaic array, thereby enabling the actual power of the photovoltaic array to track the target power.

[0037] S13, control the photovoltaic array's photovoltaic-storage inverter according to one of the first target voltage and the second target voltage, wherein the second target voltage is the voltage obtained based on the maximum power of the photovoltaic array.

[0038] Specifically, the maximum power of a photovoltaic array is affected by factors such as light intensity, temperature, and environmental changes. In other words, the maximum power of a photovoltaic array will change continuously. This means that the maximum power of a photovoltaic array may be less than the target power of the photovoltaic array. Therefore, this application does not abandon MPPT, but still uses MPPT to track the maximum power of the photovoltaic array and obtain the second target voltage based on the maximum power.

[0039] After obtaining the second target voltage, the photovoltaic array's photovoltaic-storage inverter is controlled according to either the first or the second target voltage to adjust the actual power of the photovoltaic array.

[0040] Therefore, by obtaining the first target voltage based on the target power and the second target voltage based on the maximum power, and then controlling the photovoltaic-storage inverter based on either the first or the second target voltage, the actual power of the photovoltaic array can be adjusted at high speed to meet the grid-side dispatch requirements.

[0041] The above-mentioned control of the photovoltaic array's photovoltaic energy storage inverter based on one of the first target voltage and the second target voltage may include: taking the maximum value of the first target voltage and the second target voltage as the target voltage of the photovoltaic array, and controlling the photovoltaic array's photovoltaic energy storage inverter based on the target voltage of the photovoltaic array.

[0042] Furthermore, a Max selector can be set up to obtain the target voltage of the photovoltaic array using the following formula: , in, The target voltage for the photovoltaic array. This is the second target voltage.

[0043] Specifically, for a photovoltaic array, the relationship between voltage and power is that power initially increases with increasing voltage, and then decreases with further increases in voltage. Therefore, if the maximum power of the photovoltaic array exceeds the target power (e.g., due to strong sunlight), the photovoltaic array will be in a state of... Figure 3 As shown, assuming the target power is 1500W, according to Figure 3 It can be seen that the voltage corresponding to the maximum power is less than the voltage corresponding to the target power, and the target voltage of the photovoltaic array is... equal to the first target voltage At this point, the photovoltaic array operates in a state where the target power limits the photovoltaic array.

[0044] When the light intensity decreases (assuming it drops from 1000W / m), 2 It becomes 800W / m 2If the maximum power of the photovoltaic array exceeds the target power, then no matter how it is adjusted, the output power of the photovoltaic array cannot be adjusted to the target power. At this point, under the control of the aforementioned PI controller, the first target voltage... It will continue to decrease until it falls below the second target voltage. This makes the target voltage of the photovoltaic array Equal to the second target voltage That is, the state of the photovoltaic array will change from Figure 3 Become Figure 4 At this time, the photovoltaic array is operating in MPPT state.

[0045] Conversely, when the photovoltaic array is in such a state Figure 5 When the maximum power is less than the target power, the photovoltaic array operates in MPPT mode. If the illumination increases, causing the maximum power to exceed the target power, the output power of the photovoltaic array can be adjusted to the target power. Under the control of the aforementioned PI controller, the first target voltage... It will be adjusted to be greater than the second target voltage. This makes the target voltage of the photovoltaic array equal to the first target voltage The operating status of the photovoltaic array is determined by Figure 5 The state shown becomes Figure 6 The state shown.

[0046] In other words, by setting the PI controller, the first power error value is... The first target voltage is obtained by performing proportional-integral control. This allows the photovoltaic array to automatically switch between two states: a state where the photovoltaic array is limited by the target power and a state where the maximum power can be achieved, and a state where the maximum power can be achieved based on whether the maximum power can reach the target power. This enables the photovoltaic array to meet the grid-side dispatch requirements at low cost.

[0047] Furthermore, by setting the maximum value between the two voltage values, a smooth switching between the two states can be achieved.

[0048] exist Figure 3 , Figure 4 , Figure 5 and Figure 6 In the graph, the horizontal axis represents voltage in volts (V), and the vertical axis represents power in kilowatts (P).

[0049] In some embodiments of the present invention, obtaining a second target voltage based on the maximum power includes: obtaining a second power error value based on a first power and the maximum power corresponding to the current control cycle; obtaining a third power error value based on the first power and the second power of the photovoltaic array in the previous control cycle; and obtaining a voltage change value based on the photovoltaic voltage of the photovoltaic array in the current control cycle and the previous control cycle; wherein the absolute value of the second power error value is greater than or equal to an error threshold, or the absolute value of the voltage change value is greater than or equal to a change threshold, and the second target voltage is obtained based on the third power error value and the voltage change value; wherein the absolute value of the second power error value is less than the error threshold, and the absolute value of the voltage change value is less than the change threshold, and the second target voltage is obtained based on the third power error value, the voltage change value, and the photovoltaic voltage of the photovoltaic array in the current control cycle.

[0050] Specifically, see Figure 7 The example shown first calculates the second power error value. The specific method for calculating the second power error value can be found in the following formula: , in, This is the second power error value. This is the maximum power.

[0051] Furthermore, it is also necessary to obtain the aforementioned voltage error value and the third power error value. The calculation methods for the voltage error value and the third power error value can be found in [reference needed]. Figure 8 The example shown.

[0052] First, record the historical voltage and power values ​​of the previous control cycle. The historical voltage value of the previous control cycle is the photovoltaic voltage of the previous control cycle, and the historical power value of the previous control cycle is the second power.

[0053] Furthermore, the average voltage and average power of the current cycle are calculated, and the average voltage is the photovoltaic voltage of the current control cycle. The average power is the first power mentioned above. .

[0054] Next, calculate the following formula: dp= - , du= - , Where dp is the third power error value. The second power is represented by du, where du is the voltage change value. This is the photovoltaic voltage of the previous control cycle.

[0055] Then, if the second power error value The absolute value of the voltage change value du is greater than or equal to the error threshold, or the absolute value of the voltage change value du is greater than or equal to the change threshold. The second target voltage is obtained based on the third power error value dp and the voltage change value du.

[0056] If the second power error value The absolute value of the error is less than the error threshold, and the absolute value of the voltage change value du is less than the change threshold. Based on the third power error value dp, the voltage change value du, and the photovoltaic voltage of the photovoltaic array in the current control cycle... The second target voltage is obtained.

[0057] Specifically, if the second power error value If the absolute value of the error is greater than or equal to the error threshold, or if the absolute value of the voltage change value du is greater than or equal to the change threshold, the large error regulation logic is entered. At this time, the third power error value dp is calculated and divided by the voltage change value du to obtain the voltage regulation value. .

[0058] If the second power error value If the absolute value of the voltage change value du is less than the error threshold, and the absolute value of the voltage change value du is less than the change threshold, the small error adjustment logic is executed. If the voltage change value du is greater than 0, the voltage adjustment value is adjusted. The voltage adjustment value is equal to the third power error value dp multiplied by the preset coefficient k. If the voltage change value du is less than or equal to 0, then the voltage adjustment value is... It equals the negative third power error value dp multiplied by the preset coefficient k.

[0059] Furthermore, the photovoltaic voltage Add voltage regulation value The second target voltage is obtained. .

[0060] exist Figure 7 In the example shown, the change threshold is 1, the unit is V, and the error threshold is 3%.

[0061] Therefore, the maximum power of the photovoltaic array can be achieved through the above method. By combining power changes and errors, a dynamic step size adjustment mechanism is introduced, that is, the voltage adjustment value is calculated as described above. This method effectively resolves the contradiction between tracking speed and steady-state accuracy in traditional methods.

[0062] In some embodiments of the present invention, the photovoltaic-storage inverter control method further includes: when the first target voltage is greater than the second target voltage, setting the value of the preset flag bit to a preset value.

[0063] The method for obtaining the second target voltage includes: if the value of the preset flag bit is not a preset value, or if the target power of the current control cycle is inconsistent with the target power of the previous control cycle, the second target voltage is obtained based on the maximum power; if the value of the preset flag bit is a preset value, and the target power of the current control cycle is consistent with the target power of the previous control cycle, the fourth target voltage is used as the second target voltage, wherein the fourth target voltage is the second target voltage in the previous control cycle.

[0064] The above-mentioned method of obtaining the second target voltage based on the maximum power includes: obtaining a second power error value based on the first power and the maximum power corresponding to the current control cycle; obtaining a third power error value based on the first power and the second power of the photovoltaic array in the previous control cycle; and obtaining a voltage change value based on the photovoltaic voltage of the photovoltaic array in the current control cycle and the previous control cycle. The absolute value of the second power error value is greater than or equal to an error threshold, or the absolute value of the voltage change value is greater than or equal to a change threshold, and the second target voltage is obtained based on the third power error value and the voltage change value. Alternatively, the absolute value of the second power error value is less than the error threshold, and the absolute value of the voltage change value is less than the change threshold, and the second target voltage is obtained based on the third power error value, the voltage change value, and the photovoltaic voltage of the photovoltaic array in the current control cycle.

[0065] Specifically, to address the issue of "significant oscillations and slow response" caused by the extremely flat PV curve as the photovoltaic system approaches its open-circuit voltage, an MPPT freezing strategy based on a preset flag was designed: real-time detection and judgment. and The size, when > The internal preset flag is set to a preset value, for example, 1. In the next control cycle, if the target power... If the previous control cycle has not changed compared to the next control cycle and the preset flag value is set to the preset value, the second target voltage will not be updated. That is, the second target voltage used in the next control cycle. The second target voltage used in the previous control cycle is directly adopted in the next control cycle. This allows photovoltaics to quickly exit the open-circuit voltage region, avoiding constant switching between the two target voltages due to their continuous changes, and preventing steady-state oscillations.

[0066] This solves the power oscillation problem near the open-circuit voltage and improves the system's operational stability in the high-voltage region. By using dynamic current feedforward of the power target, the relative lag of PI control is compensated, fundamentally eliminating the risks of transient overcurrent and power overshoot.

[0067] In some embodiments of the present invention, before controlling the photovoltaic array inverter based on the target voltage of the photovoltaic array, the photovoltaic array inverter control method further includes: obtaining a current limit based on the photovoltaic voltage and target power of the photovoltaic array.

[0068] Specifically, to prevent the photovoltaic array's instantaneous output power from exceeding the safety limit, current clamping protection is added to the final output stage of the voltage loop: A theoretical maximum allowable current expectation value is dynamically calculated to ensure that the system current is always within the allowable range.

[0069] in, For current limits, This represents the photovoltaic voltage during the current control cycle.

[0070] At this point, the photovoltaic-storage inverter that controls the photovoltaic array based on the target voltage of the photovoltaic array includes: obtaining the target current of the photovoltaic array based on the target voltage; and controlling the photovoltaic-storage inverter based on the minimum value of the target current and the current limit.

[0071] In some embodiments of the present invention, see Figure 9 After obtaining the target output of the power loop (the first target voltage mentioned above) and the target output of the MPPT (the second target voltage mentioned above), and obtaining the target voltage of the photovoltaic array by taking the maximum value, voltage loop control is performed based on the target voltage of the photovoltaic array to obtain the target current, and then the current limit is set as mentioned above. After current limiting, current loop control can be implemented to achieve PWM drive. Figure 10 The power transistor shown.

[0072] exist Figure 10 In the diagram, 11 is the photovoltaic array, 12 is the power tracking module used to obtain the current after current limiting, 13 is the PWM drive module used to implement the PWM drive, and +DC_Bus and -DC_Bus are the positive and negative terminals of the connection between the photovoltaic inverter and the energy storage device.

[0073] Figure 10 In this circuit, the vertical IGBT acts as the main switch, controlling the efficient switching between the input and output voltages by turning the switch on and off. In the Boost circuit, the inductor stores and releases magnetic field energy for voltage boosting and smooths the output current waveform; the capacitor receives energy released by the inductor when the switch is off, charges and stores electrical energy, and supplies power to the load when the switch is on to maintain a stable output voltage and prevent voltage drops. By selecting appropriate inductor and capacitor parameters, Figure 9 The Boost circuit in the circuit enables a highly efficient and stable boost function.

[0074] In summary, the photovoltaic-storage inverter control method of this invention obtains a first target voltage based on the target power and a second target voltage based on the maximum power, and then controls the photovoltaic-storage inverter based on one of the first target voltage and the second target voltage, thereby achieving high-speed adjustment of the actual power of the photovoltaic array to meet the grid-side dispatch requirements.

[0075] Furthermore, the present invention proposes an electronic device.

[0076] Figure 11 This is a structural block diagram of an electronic device according to an embodiment of the present invention.

[0077] like Figure 11 As shown, the electronic device 500 includes a processor 501 and a memory 503. The processor 501 and the memory 503 are connected, for example, via a bus 502. Optionally, the electronic device 500 may also include a transceiver 504. It should be noted that in practical applications, the transceiver 504 is not limited to one type, and the structure of this electronic device 500 does not constitute a limitation on the embodiments of the present invention.

[0078] Processor 501 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this invention. Processor 501 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0079] Bus 502 may include a pathway for transmitting information between the aforementioned components. Bus 502 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 502 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 11 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0080] The memory 503 stores a computer program corresponding to the photovoltaic-storage inverter control method of the above embodiments of the present invention. This computer program is executed by the processor 501. The processor 501 executes the computer program stored in the memory 503 to implement the content shown in the aforementioned method embodiments.

[0081] in, Figure 11 The electronic device 500 shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0082] According to the electronic device of the present invention, by implementing the photovoltaic-storage inverter control method of the above embodiments, the actual power of the photovoltaic array can be adjusted at high speed, thereby meeting the dispatch requirements of the grid side.

[0083] Furthermore, this invention proposes a control device for a photovoltaic-storage inverter.

[0084] Figure 12 This is a structural block diagram of the photovoltaic-storage inverter control device according to an embodiment of the present invention.

[0085] like Figure 12 As shown, the photovoltaic-storage inverter control device 100 includes: an acquisition module 101, used to acquire the first power of the photovoltaic array in the current control cycle, and obtain a first target voltage based on the first power and the target power of the photovoltaic array; and a control module 102, used to control the photovoltaic-storage inverter of the photovoltaic array based on one of the first target voltage and a second target voltage, wherein the second target voltage is the voltage obtained based on the maximum power of the photovoltaic array.

[0086] The control module 102 is specifically used to: take the maximum value of the first target voltage and the second target voltage as the target voltage of the photovoltaic array, and control the photovoltaic array's photovoltaic-storage inverter according to the target voltage of the photovoltaic array.

[0087] It should be noted that for other specific embodiments of the photovoltaic-storage inverter control device of the present invention, please refer to the photovoltaic-storage inverter control method of the above embodiments.

[0088] According to the photovoltaic-storage inverter control device of the present invention, by obtaining a first target voltage based on the target power and a second target voltage based on the maximum power, and then controlling the photovoltaic-storage inverter based on one of the first target voltage and the second target voltage, the actual power of the photovoltaic array can be adjusted at high speed to meet the dispatching requirements of the grid side.

[0089] Furthermore, this invention proposes a photovoltaic-storage inverter control system.

[0090] Figure 13 This is a structural block diagram of the photovoltaic-storage inverter control system according to an embodiment of the present invention.

[0091] like Figure 13 As shown, the photovoltaic-storage inverter control system 10 includes the aforementioned photovoltaic-storage inverter control device 100.

[0092] According to the photovoltaic-storage inverter control system of the present invention, the photovoltaic-storage inverter control device of the above embodiment can realize high-speed adjustment of the actual power of the photovoltaic array, thereby meeting the dispatching requirements of the grid side.

[0093] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein can be considered as a ordered list of executable instructions for implementing logical functions, which can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0094] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0095] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0096] In the description of this specification, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the present invention.

[0097] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0098] In this specification, unless otherwise stated, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0099] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0100] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A control method for a photovoltaic-storage inverter, characterized in that, The method includes: Obtain the first power of the photovoltaic array in the current control cycle; The first target voltage is obtained based on the first power and the target power of the photovoltaic array; The photovoltaic array's photovoltaic-storage inverter is controlled according to one of the first target voltage and the second target voltage, wherein the second target voltage is the voltage obtained based on the maximum power of the photovoltaic array; The method of controlling the photovoltaic array's photovoltaic-storage inverter based on one of the first target voltage and the second target voltage includes: The maximum value of the first target voltage and the second target voltage is taken as the target voltage of the photovoltaic array, and the photovoltaic array inverter is controlled according to the target voltage of the photovoltaic array.

2. The photovoltaic-storage inverter control method according to claim 1, characterized in that, The step of obtaining the first target voltage based on the first power and the target power of the photovoltaic array includes: A first power error value is obtained based on the first power and the target power; Perform a proportional-integral operation on the first power error value, and obtain the first target voltage based on the operation result.

3. The photovoltaic-storage inverter control method according to claim 1, characterized in that, Before controlling the photovoltaic array's photovoltaic-storage inverter according to the target voltage of the photovoltaic array, the method further includes: The current limit is obtained based on the photovoltaic voltage of the photovoltaic array and the target power; The step of controlling the photovoltaic array's photovoltaic-storage inverter according to the target voltage of the photovoltaic array includes: The target current of the photovoltaic array is obtained based on the target voltage; The photovoltaic-storage inverter is controlled based on the minimum value between the target current and the current limit.

4. The photovoltaic-storage inverter control method according to claim 1, characterized in that, The method further includes: If the first target voltage is greater than the second target voltage, the value of the preset flag bit is set to the preset value.

5. The photovoltaic-storage inverter control method according to claim 1, characterized in that, The method for obtaining the second target voltage includes: If the value of the preset flag is not a preset value, or if the target power of the current control cycle is inconsistent with the target power of the previous control cycle, the second target voltage is obtained based on the maximum power. The preset flag is set to the preset value, and the target power of the current control cycle is the same as the target power of the previous control cycle. The fourth target voltage is used as the second target voltage, wherein the fourth target voltage is the second target voltage in the previous control cycle.

6. The photovoltaic-storage inverter control method according to claim 5, characterized in that, The step of obtaining the second target voltage based on the maximum power includes: A second power error value is obtained based on the first power and the maximum power corresponding to the current control cycle, and a third power error value is obtained based on the first power and the second power of the photovoltaic array in the previous control cycle, and a voltage change value is obtained based on the photovoltaic voltage of the photovoltaic array in the current control cycle and the previous control cycle. The absolute value of the second power error value is greater than or equal to the error threshold, or the absolute value of the voltage change value is greater than or equal to the change threshold, and the second target voltage is obtained based on the third power error value and the voltage change value; The absolute value of the second power error value is less than the error threshold, and the absolute value of the voltage change value is less than the change threshold. The second target voltage is obtained based on the third power error value, the voltage change value, and the photovoltaic voltage of the photovoltaic array in the current control cycle.

7. An electronic device, characterized in that, The method includes a memory, a processor, and a computer program stored in the memory and running on the processor, wherein when the computer program is executed by the processor, it implements the photovoltaic-storage inverter control method according to any one of claims 1-6.

8. A photovoltaic-storage inverter control device, characterized in that, include: The acquisition module is used to acquire the first power of the photovoltaic array in the current control cycle, and to obtain the first target voltage based on the first power and the target power of the photovoltaic array; The control module is used to control the photovoltaic array's photovoltaic-storage inverter according to one of the first target voltage and the second target voltage, wherein the second target voltage is the voltage obtained based on the maximum power of the photovoltaic array; The control module is specifically used to: take the maximum value of the first target voltage and the second target voltage as the target voltage of the photovoltaic array, and control the photovoltaic array's photovoltaic-storage inverter according to the target voltage of the photovoltaic array.

9. A photovoltaic-storage inverter control system, characterized in that, Includes the photovoltaic-storage inverter control device according to claim 8.

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