A fast power regulation method and communication architecture for a power station system

Abstract

The present application discloses a method for rapid power regulation of a power station system and a communication architecture, the method comprising the following steps: the sub-array controller determines the number of inverters that require power regulation according to the command power and issues a power command; the corresponding inverter raises the power to the maximum power point according to the received power command; the sub-array controller calculates the power deviation according to the total output power fed back by all inverters and the received command power; the sub-array controller issues the power deviation as a power reduction command to the inverter at the maximum power point, so that the corresponding inverter operates at a reduced power. The communication architecture is used to implement the above method. Beneficial effects of the present application: by determining the number of inverters that require power regulation, the response time of rapid power regulation can be shortened without increasing the cost of the power station system; and the number of communications of the sub-array controller can be reduced as much as possible, so as to further shorten the response time of rapid power regulation.

Description

Technical Field

[0001] The present application relates to the field of renewable energy power generation technology, and in particular to a rapid power regulation method and communication architecture for a power station system. Background Art

[0002] like Figure 1 The figure shows a typical communication architecture for rapid power regulation of a power station system. When rapid power regulation is performed based on this architecture, the upper AGC unit first sends the power command to the sub-array controller, and then the sub-array controller performs PLC communication with each inverter after calculation, and sends the power command to each inverter. After receiving the power command, the inverter performs corresponding power control and can feed back the inverter information to the sub-array controller through PLC communication.

[0003] However, the above architecture has a big drawback when used, that is, the power surge regulation response time will be very long. Specifically, the sub-array controller cannot accurately know the operating status of each inverter and the remaining power of each inverter from the MPPT point; if the power command sent to the inverter is too large, some inverters will not be able to meet it. At this time, the inverters in this part need to be fed back to the sub-array controller, and then the sub-array controller will readjust the power command. This means that repeated communications are required to meet the total power demand, which will increase the power surge regulation response time. At the same time, the instructions sent by the sub-array controller to the inverter are generally broadcast, which can achieve one-to-many and fast speed; but the upload instructions fed back by the inverter to the sub-array controller are point-to-point. If the sub-array controller needs to collect information from all inverters, it will take a long time, which further increases the power surge regulation response time. Summary of the invention

[0004] One of the objectives of the present application is to provide a method for rapid power regulation of a power station system that can solve at least one of the defects in the above-mentioned background technology.

[0005] Another object of the present application is to provide a communication architecture for implementing the above-mentioned power station system rapid power regulation method.

[0006] In order to achieve at least one of the above-mentioned purposes, the technical solution adopted in the present application is: a method for rapid power regulation of a power station system, comprising the following steps: a subarray controller determines the number of inverters that need to be power regulated according to the command power and issues a corresponding power command; the inverter to be power regulated raises its own output power to the maximum power point according to the received power command; the subarray controller calculates the corresponding power deviation according to the fed-back total output power of all inverters and the received command power; the subarray controller issues the obtained power deviation as a power reduction command to the inverter at the maximum power point, so that the corresponding inverter performs power reduction operation according to the power reduction command.

[0007] Preferably, all inverters of the power station system are divided into a plurality of groups according to a set number, and the subarray controller is adapted to perform power regulation on at least one inverter group therein according to the command power.

[0008] Preferably, the subarray controller is suitable for sequentially adjusting the power of each inverter group to determine the number of inverter groups to be finally adjusted. The specific power adjustment includes the following process: after each completion of the power increase of the current inverter group, the total output power P fed back by all the current inverters is adjusted. mes With the command power P ref For comparison; if P mes >P ref , calculate the power deviation and reduce the power of the current and previous inverter groups, otherwise increase the power of the next inverter group and repeat the above process.

[0009] Preferably, the subarray controller is suitable for directly determining the number of inverter groups to be power adjusted according to the command power and performing power adjustment, which specifically includes the following process: the subarray inverter performs learning and training based on the historical data of the power station system to obtain a prediction link model; the subarray controller substitutes the received command power and the total output power of all inverters into the prediction link model to obtain an inverter group quantity adjustment interval; according to the inverter group quantity adjustment interval, the subarray controller selects a corresponding number of inverter groups to raise the power to the maximum power point and calculates the power deviation.

[0010] Preferably, the subarray controller calculates the power deviation ΔP according to the difference between the total output power fed back by all inverters and the command power avg , ΔP avg =(P mes –P ref ) / N0; wherein N0 represents the number of inverters that need to be operated at reduced power.

[0011] Preferably, each inverter group corresponds to a different signal receiving mode, and the subarray controller is suitable for controlling the corresponding inverter group by issuing power instructions of different signal sending modes.

[0012] Preferably, the carrier frequencies of the signals received by each inverter group are different, and the subarray controller is suitable for sending power instructions corresponding to the carrier frequencies to each inverter group.

[0013] A communication architecture for implementing the above-mentioned power station system rapid power regulation method includes a subarray controller and multiple inverters; the multiple inverters are divided into multiple inverter groups according to a set number, and the subarray controller is provided with signal conversion modules corresponding to the number of the inverter groups, and each of the signal conversion modules is communicatively connected with each of the inverter groups, so that the subarray controller communicates with the corresponding inverter group through the signal conversion module.

[0014] Preferably, each inverter group is communicatively connected to the corresponding signal conversion module via the same communication bus, and each inverter group and the corresponding signal conversion module have different communication modes.

[0015] A communication architecture for implementing the above-mentioned rapid power regulation method for a power station system comprises a subarray controller and a plurality of inverters; each of the inverters directly communicates with the subarray controller.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] By determining the number of inverters that need power regulation, the response time of rapid power regulation can be effectively shortened without increasing the cost of the power station system; and the number of communications of the subarray controller can be reduced as much as possible to further shorten the response time of rapid power regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the communication architecture for fast power regulation in a traditional power station system.

[0019] Figure 2 This is a schematic diagram of the workflow of rapid power regulation of the power station system in this application.

[0020] Figure 3 This is a schematic diagram of the principle of rapid power regulation of the power station system in this application.

[0021] Figure 4 This is a schematic diagram of the workflow of the array controller in this application for fast inverter power regulation according to different carrier frequencies.

[0022] Figure 5 A logical diagram of a subarray controller in the present application setting a prediction link module to perform fast power regulation of the inverter.

[0023] Figure 6 This is a schematic diagram of the structure of one embodiment of the communication architecture in this application.

[0024] Figure 7 This is a structural diagram of another embodiment of the communication architecture in the present application. DETAILED DESCRIPTION

[0025] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0026] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present application.

[0027] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0028] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] The terms "including" and "having" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0031] One aspect of the present application provides a method for rapid power regulation of a power station system, such as Figure 2 As shown, one of the preferred embodiments includes the following steps: when the power of the power station system needs to be increased, the power to be increased can be sent to the sub-array controller as the command power; at this time, the sub-array controller can determine the number of inverters that need to be power adjusted according to the command power, and send the power command to these inverters to be power adjusted in the form of broadcast. After receiving the power command, the inverter to be power adjusted can first increase its output power to the maximum power point according to the received power command, and at the same time, other inverters that have not increased their power will feed back their current output power to the sub-array controller. After receiving the output power fed back by the inverter, the sub-array controller can obtain the total output power of all inverters; then the obtained total output power is calculated with the received command power to obtain the required power deviation. Finally, the sub-array controller can send the obtained power deviation as a power reduction command to the inverter at the maximum power point, so that the corresponding inverter performs power reduction operation according to the power reduction command, thereby ensuring that the current total output power of all inverters is basically consistent with the command power required by the power station system.

[0032] It should be known that if the maximum output power of all inverters is known, the inverter that performs power boosting to the maximum power point may not feed back the current maximum output power to the subarray controller; if the maximum output power of all inverters is unknown, the inverter that performs power boosting to the maximum power point also needs to feed back the current maximum output power to the subarray controller.

[0033] For the convenience of understanding, the fast power regulation process of the inverter is described in detail below for the power regulation process of one inverter. Figure 3 As shown in the figure, the output power of the inverter before power regulation is at point A. When power regulation is required, the inverter can raise the output power from point A to the maximum power point B according to the power command issued by the subarray controller; then the inverter reduces the power to point C according to the power reduction command issued by the subarray controller. At this time, the total output power of all inverters is the required command power value. For the inverter that performs power regulation, only two broadcast communications are used to make the output power of the power station system meet the regulation requirements, which can ensure that the response time of the entire power regulation is greatly shortened, so as to ensure that the power station system meets the power accuracy requirements in the shortest possible time.

[0034] Specifically, this embodiment can first increase the power of some or all inverters to the maximum power point, that is, the MPPT point; and then calculate the amount of power that some or all inverters need to reduce based on the total output power of all inverters in the power station system and the corresponding command power. Therefore, compared with the traditional method of rapid power regulation of power station systems, this embodiment does not need to consider the output power state of the inverter before power regulation, that is, the sub-array controller does not need to receive power information fed back by the inverter before power regulation, thereby effectively shortening the response time of rapid power regulation. And after power regulation, the output power of the adjusted inverter is all working below the maximum power point, which can ensure that the inverter will not be in an overload state, thereby improving the operating safety of the inverter.

[0035] If all the inverters of the power station system are raised to the maximum power point each time the power is adjusted, the total power of the power station system will exceed the command power, and the excess value may be relatively large. Although the duration will not be very long, generally within a few hundred milliseconds, it will still bring a certain impact to the power grid. However, this embodiment determines the number of inverters to be adjusted according to the command power before adjusting the inverter power of the power station system, that is, the command power requirement is met by adjusting the inverter power as little as possible. While ensuring that the output power of the power station system does not exceed the value, the response time of the rapid power adjustment can be further shortened without increasing the cost of the power station system; and the number of communications of the subarray controller can be reduced as much as possible to further shorten the response time of the rapid power adjustment.

[0036] For ease of understanding, a simple example can be given below to illustrate. It can be assumed that the number of inverters in the power station system is 100, and the maximum output power of each inverter is P; assuming that the total output power of the power station system is 60P at this time, and the command power to be increased by the power station system is 70P. If the current output power of each inverter is the same, both 0.6P; then according to the formula X·P+(100-X)0.6P>70P, the minimum number of inverters X that need to be adjusted for power can be calculated as 26. That is, the sub-array control system only needs to issue instructions to 26 inverters, which can effectively shorten the response time of rapid power adjustment compared to issuing instructions and information feedback to 100 inverters.

[0037] In this embodiment, when the sub-array controller determines the number of inverters to be power-regulated, there are multiple specific selection methods for the inverters that need to be power-regulated, such as random selection, sequential selection, or group selection. It should be noted that the number of inverters in the power station system when performing rapid power regulation is generally large, and whether it is random or sequential selection, the number of selections is relatively large, while the number of selections required for group selection is relatively small, so in this embodiment, it is preferred to adopt the group selection method. Specifically, all inverters of the power station system can be divided into multiple groups according to the set number, and the sub-array controller can perform power regulation on at least one inverter group according to the command power.

[0038] It should be known that the specific number of each inverter group can be selected according to actual needs. For example, it can be divided into 3 groups, and the number of inverters in each group is N / 3, where N represents the total number of inverters in the power station system.

[0039] In this embodiment, there are multiple ways for the sub-array controller to determine the number of inverters to be power adjusted. For example, the number of inverter groups may be tested in sequence, or the number of inverter groups may be determined directly. For ease of understanding, the above two examples will be described in detail below. Of course, the method for determining the number of inverters to be power adjusted includes but is not limited to the above two methods.

[0040] Example 1: The subarray controller may perform power adjustment tests on each inverter group in turn to determine the number of inverter groups to be finally adjusted. The specific process is as follows:

[0041] like Figure 4 As shown, after each power increase of the current inverter group is completed, the total output power P fed back by all the current inverters is mes With the command power P ref For comparison; if P mes >Pref , calculate the power deviation and reduce the power of the current and previous inverter groups, otherwise increase the power of the next inverter group and repeat the above process.

[0042] For ease of understanding, the following will take the aforementioned division of all inverter groups into three groups as an example to describe the specific working process of Example 1 in detail. For ease of description, the three inverter groups may be first labeled as a first inverter group, a second inverter group, and a third inverter group. It should be noted that the command power is less than the total output power of all inverters at the maximum power point.

[0043] Specifically, Figure 4 As shown, the subarray controller receives the command power P ref After that, a power command can be sent to the first inverter group in the form of broadcast, so that the first inverter group can first increase the power to work at the maximum power point. Then, the remaining inverters except the first inverter group can feedback the output power to the sub-array controller, and the sub-array controller can calculate the total output power P of all inverters. mes At this time, the subarray controller can calculate the total output power P mes and command power P ref Make a comparison.

[0044] If P mes >P ref , indicating that the first inverter group can already meet the demand for the command power; then the sub-array controller can be based on the total output power P at this time mes and command power P ref Power deviation ΔP avg After the calculation is completed, the power deviation is sent to the first inverter group as a power reduction instruction, and the first inverter group will perform power reduction operation.

[0045] If P mes ≤P ref , indicating that the first inverter group cannot meet the demand for the command power; then the sub-array controller can continue to send power commands to the second inverter group in the form of broadcasting, so that the first inverter group and the second inverter group can both increase their power to work at the maximum power point. Then, the remaining inverters except the first inverter group and the second inverter group can feedback their output power to the sub-array controller, and the sub-array controller can calculate the total output power P of all inverters. mes , and then calculate the total output power P mes and command power P ref Make a comparison.

[0046] If P mes >P ref, indicating that the first inverter group and the second inverter group can already meet the demand for the command power; then the subarray controller can be based on the total output power P at this time mes and command power P ref Power deviation ΔP avg After the calculation is completed, the power deviation is sent as a power reduction instruction to the first inverter group and the second inverter group, and the first inverter group and the second inverter group will synchronously perform power reduction operation.

[0047] If P mes ≤P ref , indicating that the first inverter group and the second inverter group cannot meet the demand for the command power; then the subarray controller can continue to issue power commands to the remaining third inverter group in the form of broadcasting, so that all inverters can increase their power to work at the maximum power point. Then, according to the current total output power of all inverters and the command power P ref Power deviation ΔP avg After the calculation is completed, the power deviation is sent to all inverters as a power reduction instruction, and all inverters will perform power reduction operation synchronously.

[0048] It should be noted that for P mes =P ref The situation indicates that the output power of the inverter group whose power is lifted is just in the critical state of satisfying power regulation. At this time, the total output power P mes and command power P ref The calculated power deviation ΔP avg If P is 0, the inverter group whose power has been raised to the maximum power point will be reduced to 0. This will cause the output power of the inverter group whose power has been raised to be significantly different from that of the other inverter groups. Therefore, in order to reduce the output power difference between the inverter groups, mes =P ref It will be deemed that the command power requirement is not met.

[0049] It should be known that this example requires at least 2 broadcast communications and at least 4 broadcast communications to meet the power regulation requirements of the power station system; this can ensure that the response time of the entire power regulation of the power station system will not be long, thereby meeting the power accuracy requirements in a short time and effectively avoiding the problem that the power may significantly exceed the command in a short time.

[0050] Example 2: The subarray controller can directly determine the number of inverter groups to be power adjusted based on the command power and perform power adjustment. The specific process is as follows:

[0051] like Figure 5As shown, the subarray inverter is trained based on the historical data of the power station system to obtain a prediction link model; the subarray controller substitutes the received command power and the total output power of all inverters into the prediction link model to obtain the inverter group quantity adjustment range; according to the inverter group quantity adjustment range, the subarray controller selects the corresponding number of inverter groups to raise the power to the maximum power point and calculates the power deviation.

[0052] For ease of understanding, the following will take the aforementioned division of all inverter groups into three groups as an example to describe the specific working process of Example 2 in detail. Figure 5 As shown, for the convenience of description, the three inverter groups can be first labeled as the first inverter group, the second inverter group and the third inverter group; the three inverter groups can be divided into three adjustment intervals, adjustment interval 1 to adjustment interval 3; adjustment interval 1 corresponds to the adjustment of the first inverter group, adjustment interval 2 corresponds to the adjustment of the first inverter group and the second inverter group, and adjustment interval 3 corresponds to the adjustment of all inverters.

[0053] like Figure 5 As shown, the subarray controller converts the total output power P of all inverters to mes and command power P ref Substitute into the prediction link model; if the obtained adjustment interval result is 1, start adjusting the first inverter group. The specific adjustment process of the first inverter group is basically the same as the above example one, so it will not be repeated here; if the obtained adjustment zone result is 2, start adjusting the first inverter group and the second inverter group. The specific adjustment process is basically the same as the above example one, so it will not be repeated here; if the obtained adjustment zone result is 3, start adjusting all inverters. The specific adjustment process is basically the same as the above example one, so it will not be repeated here.

[0054] It should be known that for Example 2, if the prejudgment link is correct, the subarray controller only needs 2 broadcast communications to make the power regulation of the power station system meet the instruction requirements. Compared with Example 1, the time for power regulation response can be saved to speed up the power regulation speed of the power station system, so as to meet the power accuracy requirements in a short time, and at the same time avoid the problem that the power may greatly exceed the instruction in a short time. However, Example 2 needs to add a prejudgment link, and the design and implementation difficulty is higher than Example 1. Therefore, the above-mentioned Example 1 and Example 2 can meet the requirements of this application, and technicians in this field can choose according to actual needs.

[0055] In this embodiment, the subarray controller calculates the power deviation ΔP according to the difference between the total output power fed back by all inverters and the command power. avg , ΔP avg =(P mes –P ref) / N0; wherein N0 represents the number of inverters that need to be operated at reduced power. For ease of understanding, the following may be briefly explained by taking the above-mentioned example of all inverters being divided into 3 groups.

[0056] Specifically, it is assumed that before power regulation, the output power of each inverter is P0, and the number of inverters included in the first inverter group to the third inverter group is N1 to N3, respectively.

[0057] (1) If only the first inverter group needs to perform power regulation, then:

[0058] P mes = N1·P mpp +(N-N1) P0.

[0059] Then the power deviation ΔP avg =[N1·P mpp +(N- N1) P0-P ref ] / N1.

[0060] Among them, P mpp Indicates the output power of the inverter at the maximum power point.

[0061] (2) If only the first inverter group and the second inverter group need to be power regulated, then:

[0062] P mes =(N1+N2)·P mpp +(N-N1-N2)P0.

[0063] Then the power deviation ΔP avg =[(N1+N2)·P mpp +(N-N1-N2)P0-P ref ] / (N1+N2).

[0064] (3) If all three inverters need to be power regulated, then:

[0065] P mes =N·P mpp .

[0066] Then the power deviation ΔP avg =[N·P mpp -P ref ] / N.

[0067] In this embodiment, if multiple inverter groups use the same signal receiving method, then when the sub-array controller issues instructions, the remaining inverter groups except the target inverter group may also be interfered with; therefore, in this embodiment, the signal receiving method of each inverter group can be set differently, so that only the target inverter group can receive the instructions issued by the sub-array controller, and the remaining inverter groups will not be interfered with.

[0068] It should be known that there are many different ways to set the signal receiving mode of the inverter, for example, the signal receiving frequency of each inverter group can be set differently, and the signal modulation mode of each inverter group can be set differently; in this embodiment, the signal receiving mode of each inverter group is preferably set to a different carrier frequency of the received signal. For ease of understanding, the following will be briefly explained by taking the above-mentioned all inverters being divided into 3 groups as an example.

[0069] Specifically, the signal receiving carrier frequency of the first inverter group can be set to f1, the signal receiving carrier frequency of the second inverter group can be set to f2, and the signal receiving carrier frequency of the third inverter group can be set to f3. Then, when the power of the first inverter group is adjusted, the subarray controller can send a command signal with a frequency of f1 in the form of broadcast, and only the first inverter group can receive the command sent by the subarray controller; similarly, when the second inverter group and the third inverter group need to adjust the power, the subarray controller can continue to send command signals with frequencies of f2 and f3 to be received by the second inverter group and the third inverter group respectively.

[0070] Another aspect of the present application provides a communication architecture for implementing the above-mentioned power station system rapid power regulation method. There are multiple communication architectures that can implement the above-mentioned power station system rapid power regulation method. For ease of understanding, two specific embodiments are described in detail below.

[0071] Embodiment 1:

[0072] like Figure 6 As shown, one of the preferred embodiments of the communication architecture includes a subarray controller and multiple inverters. The multiple inverters can be divided into multiple inverter groups according to a set number, and the subarray controller is provided with a signal conversion module corresponding to the number of inverter groups, and each signal conversion module is communicatively connected with each inverter group, so that the subarray controller communicates with the corresponding inverter group through the signal conversion module. Specifically, when the subarray controller needs to perform power regulation on one or more inverter groups, it can send instructions to the corresponding inverter group through the corresponding signal conversion module to control it to perform power regulation.

[0073] It should be known that if Figure 1In the communication architecture of the traditional power station system fast power regulation shown in the figure, when performing power regulation of the inverter, the number of instructions that the sub-array controller needs to send will be consistent with the number of inverters. Since there is a delay in signal communication, the communication delay of the communication architecture of the traditional power station system fast power regulation can be regarded as the sum of the delays of all instructions. After adopting the communication architecture of this embodiment, the sub-array controller only needs to send instructions to each inverter group through each signal conversion module, that is, the number of instructions sent by the sub-array controller can be reduced to 1 / M of the original, where M represents the number of inverter groups. This also means that the communication delay can be shortened to 1 / M of the original, thereby effectively improving the response speed during inverter power regulation.

[0074] In this embodiment, there are multiple specific communication modes between each inverter group and the signal conversion module, which can be mainly divided into two cases: in the first case, each inverter group communicates with the corresponding signal conversion module separately; in the second case, all inverter groups and all signal conversion modules use the same communication bus for communication, but different inverter groups and the signal exchange modules matched therewith have different communication modes. For ease of understanding, the second case will be taken as an example for detailed description.

[0075] Specifically, Figure 6 As shown, each inverter group can be regarded as being connected in parallel to the communication bus, and the corresponding signal conversion module is also connected in parallel to the communication bus. When performing power regulation, each signal conversion module can send a command signal to the communication bus at the same time. Since the signal communication methods of each inverter group are different, each inverter group will only receive the command signal sent by the matching signal conversion module to make corresponding working condition adjustments. As for the different communication methods between each inverter group and the signal conversion module, it can be a different signal frequency or a different modulation method, etc., which can be selected according to the actual needs of technical personnel in this field. For the sake of ease of understanding, a detailed description will be given below through one of the specific examples.

[0076] Specific examples, such as Figure 6 As shown, all inverters of the power station system can be divided into three groups, each group includes N / 3 inverters; the three inverter groups are group 1, group 2 and group 3 respectively; the inverters of group 1 only receive signals with a carrier frequency of f1, the inverters of group 2 only receive signals with a carrier frequency of f2, and the inverters of group 3 only receive signals with a carrier frequency of f3. The signal conversion modules matched with each inverter group are signal conversion module #1, signal conversion module #2 and signal conversion module #3 respectively.

[0077] When it is necessary to adjust the power of the inverter of group 1, the signal conversion module #1 can send a command signal with a carrier frequency of f1 to the communication bus, and only the inverter of group 1 can receive the command signal and take corresponding actions. When it is necessary to adjust the power of the inverters of groups 1 and 2, the signal conversion modules #1 and #2 can simultaneously send command signals with carrier frequencies of f1 and f2 to the communication bus respectively, and only the inverter of group 1 and the inverter of group 2 can receive the corresponding command signals and take corresponding actions respectively. Similarly, the communication process when the inverters of groups 1, 2 and 3 are all performing power adjustment can be known.

[0078] It should be known that the specific structure and working principle of the signal conversion module are well-known technologies to those skilled in the art, so they will not be elaborated in detail here; the commonly used signal conversion module is the PLC to 485 module, that is, when the CPU module of the sub-array controller transmits the generated instruction to the PLC to 485 module through the 485 bus, the PLC to 485 module can convert the instruction signal into a PLC carrier signal of the corresponding frequency and transmit it to the PLC bus, that is, the communication bus.

[0079] Embodiment 2:

[0080] like Figure 7 As shown, one preferred embodiment of the communication architecture includes a subarray controller and a plurality of inverters; each inverter communicates directly with the subarray controller.

[0081] It should be known that by directly connecting the subarray controller and the inverter group, the communication delay can be reduced to 1 / N, N≥M; that is, this embodiment has a lower communication delay than the first embodiment. There are many types of communication between the inverter and the subarray controller, such as optical communication and microwave communication; in order to ensure communication stability and communication efficiency, optical fiber communication is preferably used between the inverter and the subarray controller in this embodiment; the communication protocol for optical communication can be defined by oneself.

[0082] It is understandable that the overall cost of the power station system does not increase much in the first embodiment, and only a certain number of signal conversion modules need to be added. However, when the number of inverters in the power station system is large, that is, when the number of inverter groups is large, there will be more and more carrier signals of different frequencies on the PLC bus, which will make the design of the PLC bus more difficult. The second embodiment can effectively reduce the communication delay through direct communication of the inverter, and the reliability of communication is also very high, which is more suitable for the situation with a large number of inverters. However, the second embodiment uses optical fiber communication and each inverter needs to lay an optical fiber channel, which increases the cost of the power station system. Therefore, the above two embodiments can meet the communication architecture requirements of the power station system of this application for rapid power regulation in different scenarios, and technicians in this field can make their own choices according to actual needs.

[0083] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A method for rapid power regulation of a power station system, characterized in that: The steps include: The subarray controller determines the number of inverters that need power adjustment based on the command power and issues power commands accordingly; The inverter to be power regulated raises its output power to the maximum power point according to the received power command; The subarray controller calculates the corresponding power deviation based on the total output power of all inverters fed back and the received command power; The subarray controller sends the obtained power deviation as a power reduction instruction to the inverter at the maximum power point, so that the corresponding inverter performs power reduction operation according to the power reduction instruction; All inverters of the power station system are divided into a plurality of groups according to a set number, and the subarray controller is adapted to adjust the power of at least one inverter group therein according to the command power; The subarray controller is adapted to perform power regulation on each inverter group in turn to determine the number of inverter groups to be finally power regulated. The specific power regulation includes the following process: After each power increase of the current inverter group is completed, the total output power P fed back by all the current inverters is mes With the command power P ref Make a comparison; If P mes >P ref , calculate the power deviation and reduce the power of the current and previous inverter groups, otherwise increase the power of the next inverter group and repeat the above process; Alternatively, the subarray controller is adapted to directly determine the number of inverter groups to be power adjusted according to the command power and perform power adjustment, which specifically includes the following process: The sub-array inverter is trained based on the historical data of the power station system to obtain the prediction link model; The subarray controller substitutes the received command power and the total output power of all inverters into the prediction link model to obtain the inverter group quantity adjustment range; According to the inverter group quantity adjustment range, the subarray controller selects a corresponding number of inverter groups to raise the power to the maximum power point and calculates the power deviation.

2. The method for rapid power regulation of a power station system according to claim 1, characterized in that: The subarray controller is based on the total output power P fed back by all inverters. mes and command power P ref The power deviation is calculated by the difference ; ； Wherein, N0 represents the number of inverters that need to perform power reduction operation.

3. The method for rapid power regulation of a power station system according to claim 1, characterized in that: The signal receiving modes corresponding to each inverter group are different, and the subarray controller is suitable for controlling the corresponding inverter group by issuing power instructions of different signal sending modes.

4. The method for rapid power regulation of a power station system according to claim 3, characterized in that: The carrier frequencies of the signals received by each inverter group are different, and the subarray controller is suitable for sending power instructions corresponding to the carrier frequencies to each inverter group.

5. A communication architecture for implementing the power station system rapid power regulation method according to any one of claims 1 to 4, characterized in that: It includes a subarray controller and multiple inverters; the multiple inverters are divided into multiple inverter groups according to a set number, and the subarray controller is provided with signal conversion modules corresponding to the number of the inverter groups. Each of the signal conversion modules is communicatively connected with each of the inverter groups, so that the subarray controller communicates with the corresponding inverter group through the signal conversion module.

6. The communication architecture according to claim 5, wherein: Each inverter group is communicatively connected with the corresponding signal conversion module via the same communication bus, and each inverter group and the corresponding signal conversion module have different communication modes.

7. A communication architecture for implementing the method for rapid power regulation of a power station system according to any one of claims 1 to 4, characterized in that: It comprises a subarray controller and a plurality of inverters; each inverter directly communicates with the subarray controller.

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