Power control method, device, power converter and power generation system

Abstract

The application relates to a power control method and device, a power converter and a power generation system. The power converter operates in a burst mode; a first measured power of a power generation assembly in a first burst period and a second measured power of the power generation assembly in a second burst period are obtained; and based on the first measured power and the second measured power, an output voltage reference of the power generation assembly in a third burst period is determined to track a maximum power point of the power generation assembly. The above method can improve the accuracy of maximum power point tracking in the burst mode.

Description

Technical Field

[0001] This application relates to the field of new energy technology, and in particular to a power control method, device, power converter and power generation system. Background Technology

[0002] In photovoltaic (PV) power generation systems, on the one hand, to improve power conversion efficiency, PV systems employ MPPT (Maximum Power Point Tracking) technology to control the output power of PV panels, ensuring they operate at their maximum power point. On the other hand, when ambient light intensity is low (such as in the early morning, evening, or on cloudy or rainy days), causing the inverter to operate under light load, the proportion of switching losses in the power converter's total losses increases significantly. To improve the system's conversion efficiency in the low-power range, the power converter typically operates in burst mode, meaning it operates for a period of time, then shuts down for another period before resuming operation, thus reducing switching losses.

[0003] When the power converter operates in burst mode, the DC bus voltage will experience a process of "stopping ripple generation - voltage accumulation and rise" and "ripple generation - voltage rapid drop", forming a low-frequency sawtooth ripple. This can easily lead to misjudgment of the tracking direction during maximum power point tracking, resulting in poor accuracy of maximum power point tracking. Summary of the Invention

[0004] Therefore, it is necessary to provide a power control method, device, power converter, and power generation system that can improve the accuracy of maximum power point tracking in burst mode, in order to address the above-mentioned technical problems.

[0005] In a first aspect, a power control method is provided for a power converter, wherein the DC terminal of the power converter is connected to a power generation component, the power converter includes a DC bus capacitor, and the power converter operates according to a burst cycle including a wave generation period and a wave blocking period; the power converter is used to convert DC energy in the DC bus capacitor into AC energy during the wave generation period; and the power converter is used to stop wave generation during the wave blocking period, so that the DC energy output by the power generation component is stored in the DC bus capacitor;

[0006] The methods include:

[0007] Acquire the first measured power of the power generation component during the first burst cycle and the second measured power during the second burst cycle;

[0008] Based on the first and second measured power, the output voltage reference of the power generation component during the third burst cycle is determined to track the maximum power point of the power generation component.

[0009] The second sudden cycle is the sudden cycle preceding the first sudden cycle, and the third sudden cycle is the sudden cycle following the first sudden cycle.

[0010] In one embodiment, determining the output voltage reference of the power generation component during the third burst cycle based on the first measured power and the second measured power includes:

[0011] Based on the comparison results of the first and second measured powers, the third disturbance direction corresponding to the third burst cycle is determined;

[0012] Based on the third disturbance direction and the output voltage reference of the power generation component during the first burst cycle, the output voltage reference of the power generation component during the third burst cycle is determined.

[0013] In one embodiment, based on the comparison result of the first measured power and the second measured power, the third disturbance direction corresponding to the third burst cycle is determined, including:

[0014] Obtain the power difference between the first measured power and the second measured power;

[0015] If the power difference is greater than or equal to the first preset threshold, the third disturbance direction is determined to be the same as the first disturbance direction corresponding to the first burst period.

[0016] If the power difference is less than or equal to the second preset threshold, the third disturbance direction is determined to be opposite to the first disturbance direction corresponding to the first burst cycle.

[0017] And / or,

[0018] Based on the comparison results of the first measured power and the second measured power, the third disturbance direction corresponding to the third burst cycle is determined, including: when the power difference is greater than the second preset threshold and less than the first preset threshold, the third disturbance direction is determined to be zero;

[0019] Alternatively, the method may further include: if the power difference is greater than a second preset threshold and less than a first preset threshold, determining the output reference voltage of the power generation component in the first burst cycle as the output reference voltage of the power generation component in the third burst cycle.

[0020] In one embodiment, the method further includes:

[0021] Obtain the first DC voltage component of the DC bus voltage of the power converter during the first burst cycle.

[0022] Based on the first DC voltage component and the output voltage reference corresponding to the third burst cycle, voltage loop control processing is performed to update the power converter's output power reference.

[0023] In one embodiment, obtaining the first DC voltage component of the DC bus voltage of the power converter during the first burst cycle includes:

[0024] Acquire multiple bus voltage sample values ​​of the power converter during the first burst cycle;

[0025] The first DC voltage component is obtained based on multiple bus voltage sampling values.

[0026] In one embodiment, the multiple bus voltage samples of the power converter during the first burst cycle include the peak value and the valley value of the bus voltage of the power converter during the first burst cycle.

[0027] Based on multiple bus voltage samples, the first DC voltage component is obtained, including:

[0028] The first DC voltage component is obtained by averaging the peak and valley values ​​of the bus voltage during the first burst cycle.

[0029] In one embodiment, acquiring multiple bus voltage sample values ​​of the power converter during the first burst cycle includes:

[0030] The DC bus voltage corresponding to the start time of the power converter's emission in the first burst cycle is obtained and used as the peak bus voltage in the first burst cycle.

[0031] The DC bus voltage corresponding to the end of the power converter's waveform generation in the first burst cycle is obtained and used as the bus voltage valley value in the first burst cycle.

[0032] In one embodiment, the method further includes: generating an event-driven signal corresponding to the first burst period in the process of acquiring the DC bus voltage of the power converter during the first burst period.

[0033] Based on the first DC voltage component and the output voltage reference corresponding to the third burst cycle, voltage loop control processing is performed to update the power converter's output power reference, including:

[0034] In response to the event-driven signal corresponding to the first burst cycle, a voltage loop adjustment operation is performed based on the first DC voltage component and the output voltage reference corresponding to the third burst cycle to update the power converter's output power reference.

[0035] In one embodiment, the method further includes:

[0036] After updating the power converter's output power reference in response to the event-driven signal corresponding to the first burst cycle, the event-driven signal corresponding to the first burst cycle is cleared.

[0037] And / or,

[0038] If no event-driven signal corresponding to the third burst cycle is detected, the power converter's output power reference remains unchanged, or the power converter's output power reference is updated according to the grid voltage.

[0039] Secondly, this application also provides a power control device for a power converter, the DC terminal of which is connected to a power generation component. The power converter includes a DC bus capacitor and operates according to a burst cycle including a wave generation period and a wave blocking period. The power converter is used to convert DC energy in the DC bus capacitor into AC energy during the wave generation period and to stop wave generation during the wave blocking period, so that the DC energy output by the power generation component is stored in the DC bus capacitor.

[0040] The device includes:

[0041] The power acquisition unit is used to acquire the first measured power of the power generation component during the first burst cycle and the second measured power during the second burst cycle.

[0042] The power tracking unit is used to determine the output voltage reference of the power generation component during the third burst cycle based on the first measured power and the second measured power of the power generation component, so as to track the maximum power point of the power generation component;

[0043] The second sudden cycle is the sudden cycle preceding the first sudden cycle, and the third sudden cycle is the sudden cycle following the first sudden cycle.

[0044] Thirdly, this application also provides a power converter, the DC terminal of which is connected to a power generation component. The power converter includes a DC bus capacitor and operates according to a burst cycle including a wave generation period and a wave blocking period. The power converter is used to convert DC energy in the DC bus capacitor into AC energy during the wave generation period and to stop wave generation during the wave blocking period, so that the DC energy output by the power generation component is stored in the DC bus capacitor.

[0045] The power converter includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of the method provided in the first aspect above.

[0046] Fourthly, this application also provides a power generation system, including power generation components and a power converter provided in the third aspect.

[0047] The aforementioned power control method, apparatus, power converter, and power generation system include a power converter whose DC terminal is connected to a power generation component. The power converter includes a DC bus capacitor and operates according to a burst cycle comprising a wave generation period and a wave blocking period. During the wave generation period, the power converter converts DC energy in the DC bus capacitor into AC energy. During the wave blocking period, the power converter stops wave generation, allowing the DC energy output by the power generation component to be stored in the DC bus capacitor. A first measured power of the power generation component in a first burst cycle and a second measured power in a second burst cycle are acquired. Based on the first and second measured power, an output voltage reference for the power generation component in a third burst cycle is determined to track the maximum power point of the power generation component. The second burst cycle is the preceding burst cycle of the first burst cycle, and the third burst cycle is the following burst cycle of the first burst cycle. Thus, by using the control cycle of the burst mode as the disturbance cycle in the maximum power point tracking (MPPT) process, the power of the current burst cycle is compared with the measured power of the previous burst cycle to determine the reference voltage adjustment direction for the next burst cycle, and the output voltage reference for the next burst cycle is determined. This ensures that the MPPT decision is based on the measured power over the entire burst cycle, rather than instantaneous power fluctuations, thus avoiding the impact of sawtooth ripples in burst mode on MPPT. The above power control method can improve the accuracy of MPPT in burst mode. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a diagram illustrating the application environment of the power control method in one embodiment;

[0050] Figure 2 This is a flowchart illustrating a power control method in one embodiment;

[0051] Figure 3 This is a schematic diagram illustrating the timing relationship between the first burst cycle, the second burst cycle, and the third burst cycle in one embodiment;

[0052] Figure 4 Here is an example of a power-voltage characteristic curve of a photovoltaic power generation module in one embodiment;

[0053] Figure 5 This is a flowchart illustrating the power control method in another embodiment;

[0054] Figure 6 This is a flowchart illustrating the steps for obtaining multiple bus voltage sample values ​​of a power converter during the first burst cycle in one embodiment.

[0055] Figure 7 This is a schematic diagram illustrating the changes in DC bus current during the blocking and generating phases in a burst mode, as shown in one embodiment.

[0056] Figure 8 This is a structural block diagram of the power control device in one embodiment;

[0057] Figure 9 This is a diagram of the internal structure of an electronic device in one embodiment. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0059] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure.

[0061] It is understood that the terms "first," "second," etc., as used in this disclosure may be used herein to describe various elements or parameters, but these elements or parameters are not limited by these terms. These terms are used only to distinguish one parameter from another. For example, without departing from the scope of this disclosure, a first burst cycle may be referred to as a second burst cycle, and similarly, a second burst cycle may be referred to as a first burst cycle. Both the first burst cycle and the second burst cycle refer to a burst cycle, but they are not the same burst cycle.

[0062] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0063] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0064] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0065] The power control method provided in this application embodiment can be applied to, for example, Figure 1 The application environment shown. For example... Figure 1 As shown, the DC terminal of the power converter 100 is connected to the power generation component 200, and the AC terminal of the power converter is connected to the power grid 300. The power converter 100 includes a DC bus capacitor Cdc and a power conversion circuit 110.

[0066] The power converter involved in this application is a power conversion device used to convert electrical energy from one form to another, realizing energy transmission and control under different power requirements. Common types include photovoltaic inverters, energy storage converters, optimizers, microinverters, and uninterruptible power supplies (UPS). For example, a power converter can convert DC direct current to AC alternating current. The DC input of the power converter is connected to a DC source (photovoltaic module), and the AC output can be connected to an AC power grid and AC equipment.

[0067] In one exemplary embodiment, the power conversion circuit 110 can be a DC-AC converter circuit employing a DAB (Dual Active Bridge) circuit topology. In one exemplary embodiment, the power conversion circuit 110 can be a unidirectional inverter circuit or a bidirectional DC-AC converter circuit.

[0068] In an exemplary embodiment, the power generation component 200 may be one of a photovoltaic power generation component, a wind power generation component, or other new energy power generation components.

[0069] In some embodiments, the AC terminal of the power converter 100 is connected to the load.

[0070] In one exemplary embodiment, please refer to Figure 2A power control method is provided for... Figure 1 In the power converter 100 shown. For example... Figure 1 As shown, the DC terminal of the power converter is connected to the power generation module. The power converter includes a DC bus capacitor and operates according to a burst cycle of transmission and blocking periods. During the transmission period, the power converter converts the DC energy in the DC bus capacitor into AC energy; during the blocking period, the power converter stops transmission, allowing the DC energy output by the power generation module to be stored in the DC bus capacitor.

[0071] like Figure 2 As shown, the power control method provided in this embodiment includes steps 202 and 204.

[0072] Step 202: Obtain the first measured power of the power generation component during the first burst cycle and the second measured power during the second burst cycle.

[0073] Please refer to Figure 1 Measure power P pv This refers to the average power of the power generation components within a burst cycle, determined by sampling electrical data within that burst cycle. The first measured power refers to the measured power corresponding to the first burst cycle, calculated based on the sampling electrical data within the first burst cycle. The second measured power refers to the measured power corresponding to the second burst cycle, calculated based on the sampling electrical data within the second burst cycle. The terms "first" and "second" in "first measured power" and "second measured power" are only used to distinguish which burst cycle they correspond to and are not used to restrict the calculation method of the measured power.

[0074] In one possible implementation, the measured power is determined by the bus voltage sample value and the bus current sample value, as shown in Formula 1.

[0075] , Formula 1

[0076] Among them, P pv The measured power is represented by L, which represents the number of power frequency cycles included in one burst cycle, and N, which represents the number of sampling points in one power frequency cycle. One sampling point includes one bus voltage sample value and one bus current sample value. U pv,i I represents the bus voltage sample value corresponding to the i-th sampling point in one power frequency cycle. pv,i This represents the bus current sample value corresponding to the i-th sampling point in one power frequency cycle.

[0077] Step 204: Based on the first measured power and the second measured power, determine the output voltage reference of the power generation component during the third burst cycle to track the maximum power point of the power generation component.

[0078] The second outbreak cycle is the preceding outbreak cycle of the first outbreak cycle, and the third outbreak cycle is the following outbreak cycle of the first outbreak cycle, such as... Figure 3 As shown. According to the control timing of the power converter, the first burst cycle refers to the current burst cycle, the second burst cycle is the burst cycle preceding the current burst cycle, and the third burst cycle is the burst cycle following the current burst cycle.

[0079] In one possible implementation, the duration of each burst cycle is not equal; that is, the burst mode uses a variable frequency cycle. In another possible implementation, the duration of each burst cycle is equal.

[0080] Here, the output voltage reference refers to the target output voltage setting of the power generation module. After determining the target output voltage setting of the power generation module, the input control parameters of the power converter, such as the duty cycle, are adjusted to change the equivalent impedance of the power converter's input, thereby making the power generation module operate according to the output voltage reference.

[0081] Based on the first and second measured power, it can be determined whether the output voltage reference of the power generation component in the first burst cycle is closer to the maximum power point of the power generation component than the output voltage reference in the second burst cycle, or whether it has reached or is near the maximum power point. In this way, the output voltage reference in the third burst cycle can be determined.

[0082] For example, please refer to the following: (Photovoltaic power generation modules) Figure 4 The graph shows the power-voltage characteristic curve of a photovoltaic (PV) power generation module. As the output voltage (called the operating point) of the PV power generation module increases, the output power of the PV power generation module first increases and then decreases. That is, there is a maximum power point for the PV power generation module. By periodically perturbing the operating point of the PV power generation module and observing the change in the output power of the PV power generation module, we can find the optimal operating point that maximizes the output power of the PV power generation module, also known as the maximum power point, in order to maximize the utilization of light energy.

[0083] Generally, an initial output voltage reference (i.e., initial operating point) is set for photovoltaic (PV) modules, typically based on a specific voltage or current level, and the measured output power at that point is recorded. The operating point is then perturbed by slightly increasing or decreasing the output voltage reference. The perturbation amplitude can be a fixed value or adaptively adjusted based on system conditions and historical observations. The output power of the PV modules is continuously measured, and this measured power is used to determine whether the previous perturbation caused an increase or decrease in the PV module's output power. If the power increases, the current perturbation direction (increase or decrease) is considered correct, and the next perturbation will continue in the same direction. If the power decreases, the perturbation direction is reversed, and adjustments are made in the opposite direction. Please refer to [reference needed]. Figure 4U1 is the initial output voltage reference of the photovoltaic module, and the corresponding measured power is P1. Decreasing the output voltage reference of the photovoltaic module to U2 results in a measured power of P2. Since P2 is greater than P1, the next disturbance will continue in the same direction, i.e., the output voltage reference of the photovoltaic module will continue to decrease. Similarly, the output voltage reference of the photovoltaic module will be decreased to U2. 3、 U 4、 If the measured power is found to be P3 greater than P2, P4 greater than P3, and P5 greater than P6, then the output voltage reference of the photovoltaic power generation module is further reduced, and the corresponding measured power is obtained until the output voltage reference of the photovoltaic power generation module is reduced from U5 to U6. If P6 is found to be less than P5, then the disturbance direction is reversed and adjusted in the opposite direction, that is, the output voltage reference of the photovoltaic power generation module is increased.

[0084] In one possible implementation, determining the output voltage reference of the power generation component during the third burst cycle based on the first measured power and the second measured power includes steps A2 to A4.

[0085] Step A2: Based on the comparison results of the first and second measured power, determine the third disturbance direction corresponding to the third burst cycle.

[0086] In one possible implementation, the process of determining the third disturbance direction corresponding to the third burst cycle based on the comparison result of the first measured power and the second measured power includes steps A22 to A26.

[0087] Step A22: Obtain the power difference between the first measured power and the second measured power.

[0088] The power difference Δp is obtained by subtracting the second measured power P1 from the first measured power P2. For an example, please refer to [reference needed]. Figure 4 Assume that the output voltage reference corresponding to the first burst cycle is U2, the corresponding first measured power is P2, the output voltage reference corresponding to the second burst cycle is U1, and the corresponding second measured power is P1.

[0089] Step A24: If the power difference is greater than or equal to the first preset threshold, determine that the third disturbance direction is the same as the first disturbance direction corresponding to the first burst cycle.

[0090] The first preset threshold is greater than zero. Optionally, the first power threshold is determined based on engineering tests and is a small, fixed power value. For example, the first power threshold is 2W. Optionally, the first power threshold is determined based on the maximum power of the power generation component and a preset ratio, for example, the preset ratio is 0.1% to 1%.

[0091] When the power difference Δp is greater than or equal to the first preset threshold, it indicates that the output power of the power generation component increases in the first burst period relative to that in the second burst period. That is, the first perturbation direction corresponding to the first burst period is the perturbation direction towards the maximum power point of the power generation component. In other words, the first perturbation direction is the output reference voltage adjustment direction that makes the output power of the power generation component increase. Therefore, the first perturbation direction remains unchanged in the third burst period. Exemplarily, please refer to Figure 4 , the output voltage reference of the first burst period is U2, which is obtained by reducing the output voltage U1 reference of the second burst period. When it is found that the measured power increases, the strategy of reducing the voltage continues to be maintained in the third burst period.

[0092] Step A26, when the power difference is less than or equal to the second preset threshold, determine that the third perturbation direction is opposite to the first perturbation direction corresponding to the first burst period.

[0093] Among them, the second preset threshold is less than zero. Exemplarily, the magnitudes of the first preset threshold and the second preset threshold are the same, but the signs are opposite; for example, the first preset threshold is a, and the second preset threshold is -a, where a is a positive number. Exemplarily, the signs of the first preset threshold and the second preset threshold are opposite, and the magnitudes are different.

[0094] When the power difference Δp is less than the second preset threshold, it indicates that the output power of the power generation component decreases in the first burst period relative to that in the second burst period. That is, the first perturbation direction corresponding to the first burst period is the perturbation direction away from the maximum power point of the power generation component. In other words, the first perturbation direction is the output reference voltage adjustment direction that makes the output power of the power generation component decrease. Therefore, the first perturbation direction is changed in the third burst period, and the third perturbation direction opposite to the first perturbation direction is set. Exemplarily, please refer to Figure 4 , assume that the output voltage reference corresponding to the first burst period is U6, and the corresponding measured power is P6, which is obtained by reducing the output voltage U5 of the second burst period. The measured power corresponding to the second burst period is P5, and P6 < P5. When it is found that the measured power decreases, the perturbation direction is adjusted in the third burst period, and the voltage starts to increase.

[0095] In a possible implementation manner, when the power difference is greater than the second preset threshold and less than the first preset threshold, determine that the third perturbation direction is zero.

[0096] Among them, when the power difference is greater than the second preset threshold and less than the first preset threshold, it indicates that the power change is extremely small, belonging to normal perturbation, that is, the maximum power point has been tracked. Exemplarily, the power difference is the system power noise. In this implementation manner, the third perturbation direction is determined to be zero.

[0097] In this embodiment, the perturbation direction ranges from +1, -1, and 0. When the perturbation direction is +1, a preset perturbation step size is added to the current output voltage reference to obtain an updated output voltage reference. When the perturbation direction is -1, a preset perturbation step size is reduced to the current output voltage reference to obtain an updated output voltage reference. When the perturbation direction is 0, the current output voltage reference remains unchanged.

[0098] Step A4: Based on the third disturbance direction and the output voltage reference of the power generation component during the first burst cycle, determine the output voltage reference of the power generation component during the third burst cycle.

[0099] For example, the process of determining the output voltage reference in the third burst cycle is shown in the following formula: U3=U1+F×B, where U3 represents the output voltage reference corresponding to the third burst cycle, U1 represents the output voltage reference corresponding to the first burst cycle, F represents the disturbance direction, and B represents the disturbance step size.

[0100] In one possible implementation, the provided power control method further includes: when the power difference is greater than a second preset threshold and less than a first preset threshold, determining the output reference voltage of the power generation component in the first burst cycle as the output voltage reference of the power generation component in the third burst cycle.

[0101] In this embodiment, if the power difference is greater than the second preset threshold and less than the first preset threshold, it indicates that the power change is minimal, and the output reference voltage of the power generation component in the first burst cycle is directly determined as the output voltage reference of the power generation component in the third burst cycle.

[0102] The power control method provided in the above embodiments acquires the first measured power of the power generation component in the first burst cycle and the second measured power in the second burst cycle; based on the first and second measured power, it determines the output voltage reference of the power generation component in the third burst cycle to track the maximum power point of the power generation component; thus, the control cycle of the burst mode is used as the disturbance cycle in the maximum power point tracking process, the power of the current burst cycle is compared with the measured power of the previous burst cycle, the reference voltage adjustment direction of the next burst cycle is determined, and the output voltage reference in the next burst cycle is determined, so that the maximum power point tracking is based on the measured power throughout the entire burst cycle, rather than the instantaneous power fluctuation value, avoiding the influence of sawtooth ripple in the burst mode on the maximum power point tracking; the power control method provided in the above embodiments can improve the accuracy of maximum power point tracking in burst mode.

[0103] In one exemplary embodiment, based on Figure 2The illustrated embodiment provides a power control method that also includes a process for updating the power converter's output power reference. Please refer to... Figure 5 The process includes steps 502 to 504.

[0104] Step 502: Obtain the first DC voltage component of the DC bus voltage of the power converter during the first burst cycle.

[0105] Within a burst cycle, during the blocking phase, the DC bus voltage increases as the capacitor charges, and during the transmitting phase, the DC bus voltage decreases as the capacitor discharges. The DC voltage component of the DC bus voltage within a burst cycle refers to the actual measured average value of the DC bus voltage during that burst cycle.

[0106] Step 504: Perform voltage loop control processing based on the first DC voltage component and the output voltage reference corresponding to the third burst cycle to update the power converter's output power reference.

[0107] Specifically, the voltage loop controller receives the output voltage reference corresponding to the third burst cycle. Then, it is compared with the first DC voltage component (i.e., the smoothed feedback voltage). The power reference corresponding to the third burst cycle is calculated by comparing the two values. This power reference is used to generate a new waveform to adjust the feedback voltage. Approximate output voltage reference .

[0108] For example, the first DC voltage component and the output voltage reference corresponding to the third burst cycle are processed by a voltage loop PI (proportional-integral) operation to obtain the power reference of the third burst cycle.

[0109] In the power control method provided in the above embodiments, the voltage loop control processing of the power converter is performed according to the burst cycle, and the DC voltage component corresponding to the current burst cycle is used as the voltage feedback signal. In this way, the voltage feedback signal seen in the voltage loop control process of the power converter is no longer a violently fluctuating sawtooth wave, but a smooth stepped wave. This makes the voltage loop no longer respond incorrectly to the normal charging and discharging ripples in burst mode, and makes the output current waveform of the power converter smoother and sinusoidal.

[0110] In one exemplary embodiment, based on Figure 3 The illustrated embodiment provides a power control method involving the process of acquiring a first DC voltage component of the DC bus voltage of a power converter during a first burst cycle. This process includes steps B2 to B4.

[0111] Step B2: Obtain multiple bus voltage sample values ​​of the power converter during the first burst cycle.

[0112] Step B4: Obtain the first DC voltage component based on multiple bus voltage sampling values.

[0113] In one possible implementation, multiple bus voltage sample values ​​within a first burst cycle are acquired according to a preset sampling frequency; the average of the multiple bus voltage sample values ​​is then calculated to obtain a first DC voltage component.

[0114] In one possible implementation, the multiple bus voltage samples of the power converter during the first burst cycle include the peak value and valley value of the bus voltage during the first burst cycle. In this implementation, the process of obtaining the first DC voltage component based on the multiple bus voltage samples includes: averaging the peak value and valley value of the bus voltage during the first burst cycle to obtain the first DC voltage component.

[0115] In burst mode, the DC bus capacitor operates in a periodic charging and discharging state. Because the output current of the power generation component fluctuates little within milliseconds, the DC bus voltage waveform is approximately a standard triangle (sawtooth wave). According to signal processing principles, the arithmetic mean of the triangular wave is strictly equal to its DC component. Therefore, in this embodiment, it is only necessary to capture the physical inflection point of the DC bus voltage, namely the peak and valley values ​​of the bus voltage within a burst cycle of the power converter. The first DC voltage component within the first burst cycle is obtained by averaging the peak and valley values. The first DC voltage component is calculated using one addition and one division, eliminating the need for high-frequency integration operations in the power converter's processor, thus reducing computational resources. Simultaneously, averaging the peak and valley values ​​of the bus voltage within a burst cycle to obtain the DC voltage component avoids various high-frequency noises during the switching process of the switching transistors. The DC component is restored using the geometric characteristics of the triangular wave, improving the robustness of the process of obtaining the DC voltage component.

[0116] In one possible implementation of this method, please refer to Figure 6 The process of acquiring multiple bus voltage sample values ​​of the power converter during the first burst cycle includes steps 602 and 604.

[0117] Step 602: Obtain the DC bus voltage corresponding to the start time of the power converter's emission in the first burst cycle, and use it as the peak value of the bus voltage in the first burst cycle.

[0118] Step 604: Obtain the DC bus voltage corresponding to the end of the power converter's waveform generation in the first burst cycle, and use it as the bus voltage valley value in the first burst cycle.

[0119] In burst mode, a complete burst cycle includes a surge phase and a burst suppression phase. During the burst suppression phase, the power converter stops outputting power, and the generator components charge the DC bus capacitor with approximately constant current source characteristics. The DC bus voltage rises linearly, and the voltage peak occurs at the start of the surge. Therefore, the DC bus voltage at the start of the surge is the peak bus voltage within that burst cycle. During the surge phase, the power converter output current releases energy, and the DC bus voltage decreases linearly. The lowest voltage point at the end of the surge, i.e., the DC bus voltage at the end of the surge, is the trough value of the bus voltage within that surge cycle. ,like Figure 7 As shown.

[0120] For example, a state machine is used to execute timing control in burst mode. During the operation of the burst mode state machine, a completed burst cycle is defined as including a "wave generation phase (ON)" and a "wave blocking phase (OFF)". During the wave generation phase, the DC bus voltage at the start of wave generation is monitored and recorded in real time to obtain the peak value of the bus voltage; during the wave blocking phase, the DC bus voltage at the start of wave blocking (i.e., the end of wave generation) is monitored and recorded in real time to obtain the valley value of the bus voltage. When the burst mode state machine jumps to the completed state, i.e., at the end of a burst cycle, a data processing event is triggered: using the recorded peak and valley values ​​of the bus voltage, the DC bus voltage of the burst cycle is smoothed to obtain the DC voltage component of the burst cycle.

[0121] In one possible implementation, the data processing event triggered when the burst mode state machine transitions to the completion state includes: calculating the measured power within the current burst cycle for maximum power point tracking.

[0122] In this implementation, the DC bus voltage at the end of the burst cycle and the DC bus voltage at the start of the burst cycle are obtained as the peak and valley values ​​of the bus voltage within the burst cycle. Then, the average value of the peak and valley values ​​of the bus voltage is calculated. By sampling the voltage twice, adding once, and dividing once, the DC voltage component corresponding to the burst cycle can be obtained without consuming high-frequency integration operations in the processor of the power converter, thus reducing computational resources.

[0123] In one exemplary embodiment, based on Figure 5 In the embodiment shown, during the process of acquiring the first DC voltage component of the DC bus voltage of the power converter within the first burst cycle, the provided power control method further includes: generating an event-driven signal corresponding to the first burst cycle.

[0124] For example, the data processing event triggered by the burst mode and state machine at the end of a burst cycle also includes setting the data valid flag after obtaining the DC voltage component of the burst cycle.

[0125] In this embodiment, the process of performing voltage loop control processing based on the first DC voltage component and the output voltage reference corresponding to the third burst cycle to update the power converter's output power reference includes: responding to the event driving signal corresponding to the first burst cycle, performing a voltage loop adjustment operation based on the first DC voltage component and the output voltage reference corresponding to the third burst cycle to update the power converter's output power reference.

[0126] In this embodiment, in the underlying high-frequency interrupt service function, the continuously executed logic in the related technology is changed to execute a "gating" logic, that is, check whether there is an event-driven signal corresponding to the current burst cycle. If there is an event-driven signal corresponding to the current burst cycle, the latest DC voltage component is read as the voltage signal feedback value, and the output voltage reference corresponding to the next burst cycle given by the MPPT module is read. A voltage loop control operation is performed to update the power converter's output power reference.

[0127] In one possible implementation, the provided power control method further includes: upon detecting an event-driven signal corresponding to the first burst cycle, updating the power converter's output power reference in response to the event-driven signal corresponding to the first burst cycle, and then clearing the event-driven signal corresponding to the first burst cycle, so as to avoid repeated voltage loop PI calculations, which could cause voltage loop integral oversaturation, resulting in large oscillations and inaccurate control.

[0128] In this embodiment, the presence of an event-driven signal is detected. If an event-driven signal is present, the latest DC voltage component and the latest output voltage reference are obtained, a voltage loop control operation is performed, the power converter's output power reference is updated, and the event-driven signal is cleared after the voltage loop control operation is completed. Another voltage loop control operation is performed only after the event-driven signal corresponding to the next burst cycle is detected.

[0129] For example, the event-driven signal is the data valid flag. The data valid flag is checked; if it indicates that new data needs to be processed, the latest DC voltage component and the latest output voltage reference are read, a voltage loop control operation is performed, the power converter's output power reference is updated, and then the data valid flag is immediately cleared.

[0130] In one possible implementation, the power converter's output power reference remains unchanged if no event-driven signal corresponding to the third burst cycle is detected.

[0131] For example, the event-driven signal is the data valid flag. The data valid flag is checked; if it indicates that no new DC voltage component exists, the voltage loop operation is skipped, and the previous transmission power reference remains unchanged.

[0132] In one possible implementation, if no event-driven signal corresponding to the third burst cycle is detected, the power converter's power reference is updated based on the grid voltage.

[0133] For example, the event-driven signal is a data valid flag. The data valid flag is checked; if it indicates that no new DC voltage component exists, the power reference is adjusted based on the grid voltage feedforward.

[0134] In the power control method provided in the above embodiments, the adjustment period of the power converter's output power reference is synchronized with the burst period by controlling the event-driven signal, so that only one voltage loop operation is performed within a burst period, thereby reducing the processor load of the power converter.

[0135] In one exemplary embodiment, a power control method is provided for... Figure 1 In the power converter 100 shown. For example... Figure 1 As shown, the DC terminal of the power converter is connected to the power generation component. The power converter includes a DC bus capacitor and operates according to a burst cycle of a transmission period and a blocking period. During the transmission period, the power converter converts the DC energy in the DC bus capacitor into AC energy; during the blocking period, the power converter stops transmission, allowing the DC energy output by the power generation component to be stored in the DC bus capacitor. The power control method in this embodiment includes steps S2 to S16.

[0136] Step S2: Obtain the DC bus voltage corresponding to the start time of the power converter's emission in the first burst cycle, and use it as the peak value of the bus voltage in the first burst cycle.

[0137] Step S4: Obtain the DC bus voltage corresponding to the end of the power converter's waveform generation in the first burst cycle, and use it as the bus voltage valley value in the first burst cycle.

[0138] Step S6: Average the peak and valley values ​​of the bus voltage within the first burst cycle to obtain the first DC voltage component, and generate the event-driven signal corresponding to the first burst cycle.

[0139] Step S8: Obtain the first measured power of the power generation component during the first burst cycle and the second measured power during the second burst cycle. The second burst cycle is the burst cycle preceding the first burst cycle.

[0140] Step S10: Based on the comparison results of the first measured power and the second measured power, determine the third disturbance direction corresponding to the third burst cycle. The third burst cycle is the burst cycle following the first burst cycle.

[0141] Optionally, the power difference between the first measured power and the second measured power is obtained; if the power difference is greater than or equal to a first preset threshold, the third disturbance direction is determined to be the same as the first disturbance direction corresponding to the first burst cycle; if the power difference is less than or equal to a second preset threshold, the third disturbance direction is determined to be opposite to the first disturbance direction corresponding to the first burst cycle; if the power difference is greater than the second preset threshold and less than the first preset threshold, the third disturbance direction is determined to be zero.

[0142] Step S12: Based on the third disturbance direction and the output voltage reference of the power generation component during the first burst cycle, determine the output voltage reference of the power generation component during the third burst cycle.

[0143] Step S14: In response to the event-driven signal corresponding to the first burst cycle, perform a voltage loop adjustment operation based on the first DC voltage component and the output voltage reference corresponding to the third burst cycle, update the power converter's output power reference, and clear the event-driven signal corresponding to the first burst cycle.

[0144] Step S16: If no event-driven signal corresponding to the third burst cycle is detected, keep the power converter's output power reference unchanged, or update the power converter's output power reference according to the grid voltage.

[0145] The power control method provided in the above embodiments discloses a feature sampling method based on the start and end times of wave generation to obtain the peak and valley values ​​of the DC bus voltage in a burst cycle. Using the peak and valley values ​​of the DC bus voltage as feature points, a triangular wave equivalent average value reconstruction method is adopted. Utilizing the physical characteristics of capacitor charging and discharging, the DC voltage component within a burst cycle is determined by the average value of the peak and valley values, resulting in a smooth feedback voltage and filtering ripple interference. The execution frequency of MPPT is no longer fixed but follows the frequency conversion cycle of the burst mode, achieving one wave per disturbance. Only after the end of a burst cycle is the measured power of the current burst cycle compared with the measured power of the previous burst cycle determined to determine the output voltage reference adjustment method for the next burst cycle, ensuring that MPPT makes decisions based on steady-state smooth values ​​rather than transient fluctuation values.

[0146] In the power control method provided in the above embodiments, the voltage ripple interference unique to the burst mode is filtered out by the "full burst cycle smoothing + discrete control" approach. The voltage loop no longer makes incorrect responses to normal charging and discharging ripples, and the output current waveform of the power converter is smoother and sinusoidal, improving the stability of the output current of the power converter. The above embodiments perform maximum power point tracking based on the measured power of two adjacent cycles, so that the MPPT module in the power converter is not affected by voltage ripple and only responds to the actual changes in illumination. This ensures the correct tracking direction under low power, enabling the power converter to stably lock the maximum power point even when the power generation components are lightly loaded, improving the energy capture rate and the tracking accuracy of the maximum power point.

[0147] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps. It is understood that the steps in different embodiments can be freely combined as needed, and all non-contradictory solutions formed by such combinations are within the scope of protection of this application.

[0148] It is understood that the term "based on" as used in this application is used to describe one or more factors that influence the determination, but does not exclude other factors that may influence the determination. For example, the phrase "determine A based on B" means that the determination of A can be based entirely or at least partially on factor B. That is, B is a factor that influences the determination of A, but does not exclude the fact that the determination of A is also based on C.

[0149] Based on the same inventive concept, this application also provides a power control device for implementing the power control method described above. The solution provided by this device is similar to the implementation described in the above method; therefore, the specific limitations in one or more power control device embodiments provided below can be found in the limitations of the power control method described above, and will not be repeated here.

[0150] In one exemplary embodiment, such as Figure 8As shown, a power control device is provided for a power converter. The DC terminal of the power converter is connected to a power generation component. The power converter includes a DC bus capacitor and operates according to a burst cycle including a transmission period and a blocking period. The power converter is used to convert DC energy in the DC bus capacitor into AC energy during the transmission period and to stop transmission during the blocking period, so that the DC energy output by the power generation component is stored in the DC bus capacitor. The power conversion device includes a power acquisition unit 802 and a power tracking unit 804.

[0151] The power acquisition unit 802 is used to acquire the first measured power of the power generation component during the first burst cycle and the second measured power during the second burst cycle.

[0152] The power tracking unit 804 is used to determine the output voltage reference of the power generation component during a third burst cycle based on a first measured power and a second measured power of the power generation component, so as to track the maximum power point of the power generation component.

[0153] The second sudden cycle is the sudden cycle preceding the first sudden cycle, and the third sudden cycle is the sudden cycle following the first sudden cycle.

[0154] In an exemplary embodiment, the power tracking unit 804 is used to determine the third disturbance direction corresponding to the third burst cycle based on the comparison result of the first measured power and the second measured power; and to determine the output voltage reference of the power generation component in the third burst cycle based on the third disturbance direction and the output voltage reference of the power generation component in the first burst cycle.

[0155] In an exemplary embodiment, the power tracking unit 804 is used to obtain the power difference between the first measured power and the second measured power; if the power difference is greater than or equal to a first preset threshold, it determines that the third disturbance direction is the same as the first disturbance direction corresponding to the first burst period; if the power difference is less than or equal to a second preset threshold, it determines that the third disturbance direction is opposite to the first disturbance direction corresponding to the first burst period.

[0156] In an exemplary embodiment, the power tracking unit 804 is configured to determine that the third disturbance direction is zero when the power difference is greater than a second preset threshold and less than a first preset threshold.

[0157] In an exemplary embodiment, the power tracking unit 804 is used to determine the output reference voltage of the power generation component in the first burst cycle as the output reference voltage of the power generation component in the third burst cycle when the power difference is greater than a second preset threshold and less than a first preset threshold.

[0158] In one exemplary embodiment, the power conversion device further includes a voltage loop control module. The voltage loop control module includes a DC voltage component acquisition unit and a closed-loop control unit; the DC voltage component acquisition unit is used to acquire the first DC voltage component of the DC bus voltage of the power converter during the first burst cycle; the closed-loop control unit is used to perform voltage loop control processing based on the first DC voltage component and the output voltage reference corresponding to the third burst cycle, and update the power converter's output power reference.

[0159] In one possible implementation, the power conversion device includes an MPPT module and a voltage loop control module. The MPPT module includes a power acquisition unit 802 and a power tracking unit 804.

[0160] In an exemplary embodiment, the DC voltage component acquisition unit is used to acquire multiple bus voltage sample values ​​of the power converter during the first burst cycle; and to obtain the first DC voltage component based on the multiple bus voltage sample values.

[0161] In an exemplary embodiment, the multiple bus voltage sample values ​​of the power converter during the first burst cycle include the peak value and valley value of the bus voltage of the power converter during the first burst cycle; the DC voltage component acquisition unit is used to average the peak value and valley value of the bus voltage during the first burst cycle to obtain the first DC voltage component.

[0162] In an exemplary embodiment, the DC voltage component acquisition unit is used to acquire the DC bus voltage corresponding to the start time of the power converter's emission in the first burst cycle, as the peak value of the bus voltage in the first burst cycle; and to acquire the DC bus voltage corresponding to the end time of the power converter's emission in the first burst cycle, as the valley value of the bus voltage in the first burst cycle.

[0163] In an exemplary embodiment, the voltage loop control module further includes a drive signal unit for generating an event drive signal corresponding to the first burst cycle during the acquisition of the first DC voltage component within the first burst cycle of the power converter's DC bus voltage. Correspondingly, the closed-loop control unit is configured to, in response to the event drive signal corresponding to the first burst cycle, perform a voltage loop adjustment operation based on the first DC voltage component and the output voltage reference corresponding to the third burst cycle, and update the power converter's output power reference.

[0164] In an exemplary embodiment, the drive signal unit is configured to clear the event drive signal corresponding to the first burst period after updating the power converter's output power reference in response to the event drive signal corresponding to the first burst period.

[0165] In one exemplary embodiment, the voltage loop control module is configured to maintain the power converter's output power reference unchanged when no event-driven signal corresponding to the third burst cycle is detected.

[0166] In one exemplary embodiment, the voltage loop control module is used to update the power converter's output power reference based on the grid voltage if no event-driven signal corresponding to the third burst cycle is detected.

[0167] Each module in the aforementioned power control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0168] In one exemplary embodiment, an electronic device is provided, which may be a controller in a power converter, and its internal structure diagram may be as follows: Figure 9 As shown, this electronic device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, Near Field Communication (NFC), or other technologies. When the computer program is executed by the processor, it implements a power control method. The display unit is used to form a visually visible image and can be a display screen, projection device, or virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the electronic device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the electronic device, or external keyboards, touchpads, or mice, etc.

[0169] Those skilled in the art will understand that Figure 9The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device to which the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0170] In one embodiment, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0171] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the steps in the above method embodiments.

[0172] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0173] In an exemplary embodiment, a power converter is provided. The DC terminal of the power converter is connected to a power generation component. The power converter includes a DC bus capacitor and operates according to a burst cycle including a transmission period and a blocking period. During the transmission period, the power converter converts DC energy in the DC bus capacitor into AC energy. During the blocking period, the power converter stops transmission, so that the DC energy output by the power generation component is stored in the DC bus capacitor. The power converter includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of the method provided in the above method embodiment.

[0174] In one exemplary embodiment, a power generation system is provided, including a power generation component and a power converter provided in the above embodiments.

[0175] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0176] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0177] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0178] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A power control method, characterized in that, The method is used in a power converter, the DC terminal of which is connected to a power generation component. The power converter includes a DC bus capacitor and operates according to a burst cycle including a transmission period and a blocking period. The power converter is used to convert DC energy in the DC bus capacitor into AC energy during the transmission period and to stop transmission during the blocking period, so that the DC energy output by the power generation component is stored in the DC bus capacitor. The method includes: Acquire the first measured power of the power generation component during the first burst cycle and the second measured power during the second burst cycle; Based on the first measured power and the second measured power, the output voltage reference of the power generation component during the third burst cycle is determined to track the maximum power point of the power generation component; Wherein, the second burst cycle is the burst cycle preceding the first burst cycle, and the third burst cycle is the burst cycle following the first burst cycle.

2. The method according to claim 1, characterized in that, The step of determining the output voltage reference of the power generation component during the third burst cycle based on the first measured power and the second measured power includes: Based on the comparison results of the first measured power and the second measured power, the third disturbance direction corresponding to the third burst cycle is determined; Based on the third disturbance direction and the output voltage reference of the power generation component during the first burst cycle, the output voltage reference of the power generation component during the third burst cycle is determined.

3. The method according to claim 2, characterized in that, The step of determining the third disturbance direction corresponding to the third burst cycle based on the comparison result of the first measured power and the second measured power includes: Obtain the power difference between the first measured power and the second measured power; If the power difference is greater than or equal to a first preset threshold, the third disturbance direction is determined to be the same as the first disturbance direction corresponding to the first burst period. If the power difference is less than or equal to the second preset threshold, the third disturbance direction is determined to be opposite to the first disturbance direction corresponding to the first burst cycle. And / or, The step of determining the third disturbance direction corresponding to the third burst cycle based on the comparison result of the first measured power and the second measured power includes: determining the third disturbance direction as zero when the power difference is greater than the second preset threshold and less than the first preset threshold; Alternatively, the method further includes: when the power difference is greater than a second preset threshold and less than the first preset threshold, determining the output reference voltage of the power generation component in the first burst cycle as the output reference voltage of the power generation component in the third burst cycle.

4. The method according to claim 1, characterized in that, The method further includes: Obtain the first DC voltage component of the DC bus voltage of the power converter during the first burst cycle; Based on the first DC voltage component and the output voltage reference corresponding to the third burst cycle, voltage loop control processing is performed to update the power converter's output power reference.

5. The method according to claim 4, characterized in that, The step of obtaining the first DC voltage component of the DC bus voltage of the power converter during the first burst cycle includes: Obtain multiple bus voltage sample values ​​of the power converter during the first burst cycle; The first DC voltage component is obtained based on the multiple bus voltage sampling values.

6. The method according to claim 5, characterized in that, The multiple bus voltage sampling values ​​of the power converter during the first burst cycle include the peak value and valley value of the bus voltage of the power converter during the first burst cycle; The step of obtaining the first DC voltage component based on the plurality of bus voltage sampling values ​​includes: The first DC voltage component is obtained by averaging the peak and valley values ​​of the bus voltage during the first burst cycle.

7. The method according to claim 6, characterized in that, The step of acquiring multiple bus voltage sample values ​​of the power converter during the first burst cycle includes: The DC bus voltage corresponding to the start time of the power converter's emission in the first burst cycle is obtained and used as the peak bus voltage in the first burst cycle. The DC bus voltage corresponding to the end of the power converter's emission during the first burst cycle is obtained and used as the bus voltage valley value during the first burst cycle.

8. The method according to claim 4, characterized in that, In the process of obtaining the first DC voltage component of the DC bus voltage of the power converter within the first burst cycle, the method further includes: generating an event driving signal corresponding to the first burst cycle; The step of performing voltage loop control processing based on the first DC voltage component and the output voltage reference corresponding to the third burst cycle, and updating the power converter's output power reference, includes: In response to the event-driven signal corresponding to the first burst cycle, a voltage loop adjustment operation is performed based on the first DC voltage component and the output voltage reference corresponding to the third burst cycle to update the power converter's output power reference.

9. The method according to claim 8, characterized in that, The method further includes: After updating the power converter's output power reference in response to the event-driven signal corresponding to the first burst cycle, the event-driven signal corresponding to the first burst cycle is cleared. And / or, If no event-driven signal corresponding to the third burst cycle is detected, the power converter's output power reference remains unchanged, or the power converter's output power reference is updated according to the grid voltage.

10. A power control device, characterized in that, The device is used for a power converter, the DC terminal of which is connected to a power generation component. The power converter includes a DC bus capacitor and operates according to a burst cycle including a transmission period and a blocking period. The power converter is used to convert the DC energy in the DC bus capacitor into AC energy during the transmission period and to stop transmission during the blocking period, so that the DC energy output by the power generation component is stored in the DC bus capacitor. The device includes: The power acquisition unit is used to acquire the first measured power of the power generation component during the first burst cycle and the second measured power during the second burst cycle. A power tracking unit is configured to determine the output voltage reference of the power generation component during a third burst cycle based on the first measured power and the second measured power of the power generation component, so as to track the maximum power point of the power generation component; Wherein, the second burst cycle is the burst cycle preceding the first burst cycle, and the third burst cycle is the burst cycle following the first burst cycle.

11. A power converter, characterized in that, The DC terminal of the power converter is connected to the power generation component. The power converter includes a DC bus capacitor. The power converter operates according to a burst cycle that includes a wave generation period and a wave blocking period. The power converter is used to convert the DC energy in the DC bus capacitor into AC energy during the wave generation period. The power converter is used to stop wave generation during the wave blocking period, so that the DC energy output by the power generation component is stored in the DC bus capacitor. The power converter includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method according to any one of claims 1 to 9.

12. A power generation system, characterized in that, The power generation system includes power generation components and a power converter as described in claim 11.

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