AVC adjusting method and device for reactive power optimization of photovoltaic station

Abstract

The invention relates to the field of power system control, and discloses an AVC adjusting method and device for reactive power optimization of a photovoltaic station, and the method comprises the steps: providing reactive power by a reactive power compensation device in a pooling station when the electrical data of each bus in the pooling station does not meet a second preset condition; and after the reactive power compensation device in the pooling station provides reactive power, judging whether the electrical data of each bus in the pooling station meets a second preset condition, if not, providing reactive power by a photovoltaic inverter of the photovoltaic field station, and if not, providing reactive power by the reactive power compensation device of the photovoltaic field station. Therefore, under the condition that the low-voltage bus voltage and the reactive power output of the photovoltaic field station reach the upper limit, the reactive power compensation device of the pooling station emits average and in-phase reactive power output, and finally the reactive power distribution of the photovoltaic large-base pooling station and the photovoltaic field station system is optimized. And the total reactive power distribution of the whole large-base pooling station and the photovoltaic station is more reasonable and coordinated.

Description

Technical Field

[0001] The present invention relates to the field of power system control, and particularly to an AVC regulation method and device for reactive power optimization of a photovoltaic power station. Background Art

[0002] As Figure 1 shown, in the related art, the reactive power voltage control method for active supervision and detection of a new energy photovoltaic power station includes: initializing the inverter group, setting the data acquisition period and control period of the AVC substation: collecting the bus voltage, outgoing active power value and reactive power value at the grid connection point, and the voltage set value issued by the master station, and calculating the voltage difference: when the voltage difference is greater than the control dead zone, entering the correction control mode; when the voltage difference is within the balance dead zone, entering the optimization control mode; after issuing the reactive power command, dynamically adjusting the inverter group according to the adjustment effect; giving priority to testing after the equipment failure of the fault locking group is lifted, and moving it to the full-optimization group after passing the test. By dynamically adjusting and optimizing the inverter reactive power voltage, this method improves the power quality and system stability, enhances the automation and response speed of the system, is applicable to photovoltaic power stations of different scales, and effectively guarantees the efficient utilization of new energy.

[0003] However, through investigation, it is found that due to the electrical design reasons of this new energy large base photovoltaic power station, the electrical main wiring structure is special, that is, the 6 sections of 35kV busbars on the low-voltage side of the 3 main transformers in the 220kV collection station are respectively connected to two phases of 35kV photovoltaic switch stations (photovoltaic field 1 and photovoltaic field 2). Every two sections of 35kV busbars in the switch station are connected to the low-voltage side winding of the corresponding main transformer in the 220kV collection station, belonging to the same voltage point. Such a special electrical main wiring structure is widely used in most new energy large base projects. When the electrical main wiring structure is designed, the low-voltage busbar of the high-voltage collection station is connected from the photovoltaic switch station, resulting in the 35kV busbar on the low-voltage side of the 220kV collection station being extended into two levels, causing contradictions when the reactive power output in the 35kV photovoltaic switch stations (photovoltaic field 1 and photovoltaic field 2) supports and cooperates with the reactive power output in the 220kV collection station. As a result, the reactive power outputs of some reactive power compensation devices cancel each other out, bringing potential safety hazards to the reactive power adjustment of the entire large base collection station and photovoltaic power station, and the risk of reactive power oscillation is extremely likely to occur due to insufficient reactive power compensation. Summary of the Invention

[0004] In view of this, the present invention provides an AVC regulation method and device for reactive power optimization of a photovoltaic power station to solve the problem of unreasonable reactive power compensation in a photovoltaic power station cascaded by a low-voltage busbar of a high-voltage collection station in a new energy large base.

[0005] In a first aspect, the present invention provides an AVC regulation method for reactive power optimization of a photovoltaic power station yard, characterized in that the photovoltaic power station yard includes a collection station and a plurality of photovoltaic power stations, and the method includes: obtaining electrical data of each bus in the collection station and each photovoltaic power station; based on the electrical data of each bus in the collection station and each photovoltaic power station, determining whether the electrical data of each bus in the collection station meets a first preset condition, and when it does not meet, determining whether the electrical data of each bus in the collection station meets a second preset condition; when the electrical data of each bus in the collection station does not meet the second preset condition, reactive power is provided by the reactive power compensation device in the collection station; after the reactive power compensation device in the collection station provides reactive power, determining whether the electrical data of each bus in the collection station meets the second preset condition, and when it does not meet, reactive power is provided by the photovoltaic inverters of the photovoltaic power stations, and the shortage is provided by the reactive power compensation device of the photovoltaic power stations; determining whether the reactive power compensation device of the photovoltaic power stations meets a third preset condition, and if it meets, returning to the step of "determining whether the electrical data of each bus in the collection station meets the second preset condition" until the electrical data of each bus in the collection station meets the preset condition.

[0006] In the present invention, when the electrical data of each bus in the collection station does not meet the second preset condition, reactive power is provided by the reactive power compensation device in the collection station; after the reactive power compensation device in the collection station provides reactive power, determining whether the electrical data of each bus in the collection station meets the second preset condition, and when it does not meet, reactive power is provided by the photovoltaic inverters of the photovoltaic power stations, and the shortage is provided by the reactive power compensation device of the photovoltaic power stations, so as to ensure that the reactive power compensation device in the collection station emits average and in-phase reactive power output under the condition that the low-voltage bus voltage and reactive power output of the photovoltaic power stations have reached the upper limit, and finally optimize the reactive power distribution of the collection station of the large photovoltaic base and the photovoltaic power stations, making the total reactive power distribution of the entire large base collection station and the photovoltaic power stations more reasonable and coordinated.

[0007] In an optional implementation manner, the buses of the collection station include: a plurality of high-voltage buses and a plurality of low-voltage buses, wherein each low-voltage bus is correspondingly connected to a low-voltage bus of a photovoltaic power station.

[0008] In an optional implementation manner, the process of determining whether the electrical data of each bus in the collection station meets the first preset condition includes: determining whether the voltage of each bus in the collection station meets the target voltage value issued by the AVC master station.

[0009] In an optional implementation manner, the process of determining whether the electrical data of each bus in the collection station meets the second preset condition includes: comparing the voltage of each low-voltage bus in the collection station with the voltage of the low-voltage bus of the photovoltaic power station to which it is connected; when the voltages of a preset number of low-voltage buses in the collection station are different from the voltages of the low-voltage buses of the photovoltaic power stations to which they are connected, the second preset condition is not met.

[0010] In an alternative embodiment, the process of providing reactive power by the photovoltaic inverters of the photovoltaic power station and providing the deficit reactive power by the reactive power compensation device of the photovoltaic power station includes: each AVC sub-station calculates the reactive power deficit of each low-voltage bus of the photovoltaic power station; each AVC sub-station controls the photovoltaic inverters of the photovoltaic power station to provide reactive power, and the reactive power compensation device of the photovoltaic power station provides the deficit reactive power.

[0011] In an alternative embodiment, the process of determining whether the reactive power compensation device of the photovoltaic power station meets the third preset condition includes: determining whether the reactive power output of the reactive power compensation device of the photovoltaic power station reaches the target voltage issued by the AVC sub-station; if it reaches the target voltage issued by the AVC sub-station, then the third preset condition is met.

[0012] In a second aspect, the present invention provides an AVC adjustment device for reactive power optimization of a photovoltaic power station. Based on the first aspect and any of its alternative AVC adjustment methods for reactive power optimization of a photovoltaic power station, the device includes: an acquisition module for acquiring the electrical data of each bus in the collection station and each photovoltaic power station; a first judgment module for judging, based on the electrical data of each bus in the collection station and each photovoltaic power station, whether the electrical data of each bus in the collection station meets the first preset condition, and when it does not meet, judging whether the electrical data of each bus in the collection station meets the second preset condition; a second judgment module for, when the electrical data of each bus in the collection station does not meet the second preset condition, providing reactive power by the reactive power compensation device in the collection station; a third judgment module for, after the reactive power compensation device in the collection station provides reactive power, judging whether the electrical data of each bus in the collection station meets the second preset condition, and when it does not meet, providing reactive power by the photovoltaic inverters of the photovoltaic power station, and providing the deficit reactive power by the reactive power compensation device of the photovoltaic power station; a loop module for judging whether the reactive power compensation device of the photovoltaic power station meets the third preset condition, and if it meets, returning to the step of "judging whether the electrical data of each bus in the collection station meets the second preset condition" until the electrical data of each bus in the collection station meets the preset condition.

[0013] In a third aspect, the present invention provides a computer device, including: a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the AVC adjustment method for reactive power optimization of a photovoltaic power station according to the first aspect or any corresponding embodiment thereof.

[0014] In a fourth aspect, the present invention provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions are used to cause a computer to execute the AVC adjustment method for reactive power optimization of a photovoltaic power station according to the first aspect or any corresponding embodiment thereof.

[0015] Fifth aspect, the present invention provides a computer program product, including computer instructions for causing a computer to execute the AVC adjustment method for reactive power optimization of a photovoltaic power station according to the first aspect or any corresponding embodiment thereof as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a flowchart of the AVC adjustment method in the related art;

[0018] Figure 2 is a flowchart of the AVC adjustment method for reactive power optimization of a photovoltaic power station according to an embodiment of the present invention;

[0019] Figure 3 is the main wiring diagram of a collection station according to an embodiment of the present invention;

[0020] Figure 4 is the main wiring diagram of Photovoltaic Field 1 according to an embodiment of the present invention;

[0021] Figure 5 is the main wiring diagram of Photovoltaic Field 2 according to an embodiment of the present invention;

[0022] Figure 6 is a flowchart of another AVC adjustment method for reactive power optimization of a photovoltaic power station according to an embodiment of the present invention;

[0023] Figure 7 is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0025] According to an embodiment of the present invention, an embodiment of an AVC regulation method for reactive power optimization of a photovoltaic power station is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0026] In the related art, large-scale base collection stations and photovoltaic power stations are currently equipped with three sets of AVC sub-stations. The 220 kV photovoltaic collection station AVC sub-station is connected to 6 sets of SVG (#1 SVG to #6 SVG, with a single capacity of 36 MVar). The dispatching AVC master station issues 220 kV voltage target instructions to the collection station AVC sub-station, and the AVC sub-station controls the reactive power output of the 6 sets of SVG in the collection station to complete the regulation of the voltage of 6 sections of 35 kV busbars and 220 kV busbars. The AVC sub-station of Photovoltaic Field 1 is connected to 4 sections of 35 kV busbars and 4 sets of SVG (#7 SVG to #10 SVG, with a single capacity of 19 MVar). The dispatching AVC master station issues 35 kV busbar voltage target instructions to the AVC sub-station of Photovoltaic Field 1 respectively, and regulates the voltage of 4 sections of 35 kV busbars by controlling the reactive power output of the inverters and 4 sets of SVG. The reactive power of the inverters takes precedence over the SVG regulation. The AVC sub-station of Photovoltaic Field 2 is connected to 5 sections of 35 kV busbars and 5 sets of SVG (#11 SVG to #15 SVG, with a single capacity of 15 MVar). The dispatching AVC master station issues 35 kV busbar voltage target instructions to the AVC sub-station of Photovoltaic Field 2 respectively, and regulates the voltage of 5 sections of 35 kV busbars by controlling the reactive power output of the inverters and 5 sets of SVG. The reactive power of the inverters takes precedence over the SVG regulation.

[0027] At present, the AVC system regulation instructions of the 6 sections of 35kV buses in PV Field 1 (35kV I bus to IV bus) and PV Power Station 2 (35kV I bus and II bus) connected to the 220kV collection station are all issued separately by the dispatching AVC master station, resulting in deviations in the regulation instruction voltages of the two 35kV buses from the same voltage point (the same main transformer low-voltage side). The inconsistent AVC regulation instructions of the 6 sections of 35kV buses in PV Field 1 and PV Power Station 2 also lead to disordered reactive output regulation of the two SVGs carried by different branches of the same main transformer low-voltage winding (the same winding voltage on the main transformer low-voltage side is the same), which respectively send out inductive and capacitive reactive outputs. Since the inductive and capacitive reactive outputs cancel each other out, the reactive support of the same main transformer low-voltage winding is seriously insufficient, causing the 35kV bus connected to the low-voltage winding of the 220kV collection station to operate at a low voltage for a long time (maximum 35.7kV). The 220kV voltage on the high-voltage side of the main transformer also runs at a low voltage (maximum 238kV, once as low as 234kV) due to the lack of reactive support on the low-voltage side of the main transformer. The reactive output of the six SVGs is often in full-generation state, which will cause the large-base collection station and photovoltaic field station to operate under the conditions of the "two detailed rules" assessment. In addition, this SVG regulation method fails to give full play to the reactive power support and regulation of the 35kV bus voltage for the photovoltaic field 1 and photovoltaic field 2 power supply systems, and increases the field power consumption rate and active power loss, which is neither safe nor economical.

[0028] The relevant technology did not take into account the special electrical main connection structure of the photovoltaic station in the large-scale new energy base, and the three existing AVC substations did not fully consider the voltage and reactive power optimization adjustment of the six sections of 35kV busbars on the low-voltage side of the 220kV collection station, resulting in the six SVGs connected to the six sections of 35kV busbars often being in a full-power state. Correspondingly, the SVGs connected to the multiple 35kV busbars in Photovoltaic Field 1 and Photovoltaic Field 2 emit opposite reactive power in pairs, and the reactive output of each SVG device cancels each other out, which brings safety hazards to the reactive power adjustment of the entire new energy base station, and easily causes the risk of reactive power oscillation of the entire large-scale collection station and photovoltaic station.

[0029] In order to solve the above problems, an AVC regulation method for reactive power optimization of a photovoltaic station is provided in this embodiment. The photovoltaic station includes a collection station and multiple photovoltaic stations, such as Figure 2 As shown, AVC regulation includes:

[0030] Step S1: Obtain the electrical data of each bus in the collection station and each photovoltaic field station.

[0031] For example, Figures 3 to 5 For example, Figure 3 Main connection for 220kV photovoltaic collection station. Figure 4 , Figure 5 This is the main wiring diagram of the photovoltaic station, where Figure 4 This is the main wiring diagram of photovoltaic field 1.Figure 5 It is the main wiring diagram of the PV2 station. The busbars of the collection station include: multiple sections of high-voltage busbars and multiple sections of low-voltage busbars. Among them, each section of the low-voltage busbar is correspondingly connected to a low-voltage busbar of a PV station. For example: Section I of the 35kV I busbar of the collection station is connected to the 35kV I busbar of PV Station 1 through Line 1 of PV Station 1.

[0032] Figures 3 to 5 Among them, multiple AVC sub-stations and remote measurement points are set. The algorithm programs of each AVC sub-station are initialized to collect the voltage and reactive power distribution data of the 220kV busbar of the collection station, 6 sections of 35kV busbars, 4 sections of 35kV busbars of PV Station 1, and 2 sections of 35kV busbars of PV Station 2.

[0033] Step S2: Based on the electrical data of each busbar in the collection station and each PV station, determine whether the electrical data of each busbar in the collection station meets the first preset condition. When it does not meet, determine whether the electrical data of each busbar in the collection station meets the second preset condition.

[0034] Optionally, determine whether the voltage of each busbar in the collection station meets the target voltage value issued by the AVC master station. When the voltage of each busbar in the collection station reaches the target voltage value issued by the AVC master station, it meets the first preset condition, and there is no need to coordinate and control the current power output of the 220kV collection station, PV Station 1, and PV Station 2 of the entire large PV base. If it does not reach, determine whether the electrical data of each busbar in the collection station meets the second preset condition.

[0035] Optionally, the process of determining whether the electrical data of each busbar in the collection station meets the second preset condition includes: comparing the voltage of each low-voltage busbar in the collection station with the voltage of the low-voltage busbar of the PV station it is connected to; when the voltages of a preset number of low-voltage busbars in the collection station are different from the voltages of the low-voltage busbars of the PV stations they are connected to, it does not meet the second preset condition.

[0036] Specifically, refer to Figures 3 to 5, a new AVC substation is added to the 220kV collection substation, which collects the voltage data of the two busbars of Section I and Section II of the 35kV I bus, compares it with the voltage of the 35kV I bus and II bus of Photovoltaic Farm 1, and judges whether the voltage of Section I and Section II of the 35kV I bus of the 220kV collection substation is the same as that of the 35kV I bus and II bus of Photovoltaic Farm 1; the voltage data of the two busbars of Section I and Section II of the 35kV II bus is compared with the voltage of the 35kV III bus and IV bus of Photovoltaic Farm 1 to judge whether the voltage of Section I and Section II of the 35kV II bus of the 220kV collection substation is the same as that of the 35kV III bus and IV bus of Photovoltaic Farm 1; the voltage data of the two busbars of Section I and Section II of the 35kV III bus is compared with the voltage of the 35kV I bus and II bus of Photovoltaic Farm 2 to judge whether the voltage of Section I and Section II of the 35kV III bus of the 220kV collection substation is the same as that of the 35kV III bus and II bus of Photovoltaic Farm 2. If the voltages are the same in all three of the above items or in one or two of them, the second preset condition is satisfied, and the step of "judging whether the electrical data of each busbar in the collection substation meets the second preset condition" is returned.

[0037] Step S3: When the electrical data of each busbar in the collection substation does not meet the second preset condition, reactive power is provided by the reactive power compensation device in the collection substation.

[0038] Specifically, when the second preset condition is not met, coordinated control of the 220kV collection substation, Photovoltaic Farm 1 and Photovoltaic Farm 2 systems of the entire large photovoltaic base is required. Exemplarily, refer to Figures 3 to 5 , judge whether the voltage of Section I and Section II of the 35kV I bus of the 220kV collection substation is the same as that of the 35kV I bus and II bus of Photovoltaic Farm 1, whether the voltage of Section I and Section II of the 35kV II bus of the 220kV collection substation is the same as that of the 35kV III bus and IV bus of Photovoltaic Farm 1, and whether the voltage of Section I and Section II of the 35kV III bus of the 220kV collection substation is the same as that of the 35kV III bus and II bus of Photovoltaic Farm 2. If the voltages are different in all three of the above items or in one or two of them, the reactive power deficit is calculated based on the voltage difference, and the reactive power output support is provided by #1 SVG and #2 SVG, #3 SVG and #4 SVG, #6 SVG and #6 SVG on the 35kV side of the 220kV collection substation respectively.

[0039] Step S4: After the reactive power compensation device in the collection substation provides reactive power, judge whether the electrical data of each busbar in the collection substation meets the second preset condition. When it does not meet, the photovoltaic inverter of the photovoltaic power station provides reactive power, and the deficit is provided by the reactive power compensation device of the photovoltaic power station.

[0040] Optionally, when the electrical data of each busbar in the collection substation does not meet the second preset condition, each AVC substation calculates the reactive power deficit of each low-voltage busbar of the photovoltaic power station; each AVC substation controls the photovoltaic inverter of the photovoltaic power station to provide reactive power, and the reactive power compensation device of the photovoltaic power station provides the deficit reactive power.

[0041] Specifically, referring to Figures 3 to 5 , a photovoltaic power plant AVC substation is set up to collect the voltage and reactive power data of the 35kV I and II buses, and the voltage and reactive power data of the 35kV III and IV buses, calculate the reactive power deficit of each bus respectively, and issue reactive power regulation control instructions. Specifically, the following regulation methods are executed:

[0042] (1) The operating photovoltaic inverters connected to the collector line 1 to collector line 12 of the photovoltaic power plant 1 provide reactive power output, the operating photovoltaic inverters connected to the collector line 13 to collector line 24 of the photovoltaic power plant 1 provide reactive power output, and the operating photovoltaic inverters connected to the collector line 25 to collector line 34 of the photovoltaic power plant 2 provide reactive power output.

[0043] (2) The reactive power deficit of the 35kV I and II buses of the photovoltaic power plant 1 is supported by the reactive power output of #7 SVG and #8 SVG, the reactive power deficit of the 35kV III and IV buses of the photovoltaic power plant 1 is supported by the reactive power output of #9 SVG and #10 SVG, and the reactive power deficit of the 35kV I and II buses of the photovoltaic power plant 2 is supported by the reactive power output of #11 SVG and #12 SVG.

[0044] Step S5: Determine whether the reactive power compensation device of the photovoltaic power station meets the third preset condition. If it meets, return to the step of "judging whether the electrical data of each bus in the collection station meets the second preset condition" until the electrical data of each bus in the collection station meets the preset condition.

[0045] Optionally, the process of determining whether the reactive power compensation device of the photovoltaic power station meets the third preset condition includes: determining whether the reactive power output of the reactive power compensation device of the photovoltaic power station reaches the target voltage issued by the AVC substation; if it reaches the target voltage issued by the AVC substation, then it meets the third preset condition.

[0046] Specifically, referring to Figures 3 to 5 , after the reactive power outputs of the 6 SVG devices connected to the 6 35kV buses of the photovoltaic power plant 1 and the photovoltaic power plant 2 reach the target voltage values issued by the AVC substation, respectively determine whether the voltage of section I and section II of the 35kV I bus is the same as that of the 35kV I and II buses of the photovoltaic power plant 1, whether the voltage of section I and section II of the 35kV II bus is the same as that of the 35kV III and IV buses of the photovoltaic power plant 1, and whether the voltage of section I and section II of the 35kV III bus is the same as that of the 35kV I and II buses of the photovoltaic power plant 2. If all three or one or two of the above items have different voltages, the AVC substations of the photovoltaic power plant 1 and the photovoltaic power plant 2 continue to execute step S4 for reactive power adjustment. If all three or one or two of the above items have the same voltage, return to step 3, and continue to execute steps 3 to 5 in sequence starting from the new AVC substation of the 220kV collection station for reactive power adjustment.

[0047] Exemplarily, such asFigure 6 As shown in Figure 6 , in view of the unreasonable reactive power compensation problem in the low-voltage bus cascaded photovoltaic power station of the high-voltage collection station in large new energy bases, this embodiment involves the following improvements:

[0048] (1) Add a set of AVC sub-stations (6 remote measurement points and a set of software programs) to monitor and optimize the regulation of the voltage and reactive power output of the 6 sections of 35kV buses on the low-voltage side of the 220kV collection station, and slow down and eliminate the situation where the 6 SVG devices connected to the 6 sections of 35kV buses are often fully loaded.

[0049] (2) Optimize and coordinate the reactive power output control of the SVG devices connected to the 35kV buses of Photovoltaic Field 1 and Photovoltaic Field 2 and the in-operation photovoltaic inverters connected to each photovoltaic collection line (the inverter gives priority to generating reactive power, and the shortage is provided by the SVG on the corresponding bus), eliminate the situation where the SVG devices generate opposite reactive power between each other, avoid the mutual cancellation of reactive power output between the SVG devices, and prevent the risk of reactive power oscillation in the entire large base collection station and photovoltaic power station.

[0050] (3) Coordinate the reactive power cooperation relationship between a set of newly added AVC sub-stations on each 35kV bus of the 220kV collection station and the two sets of AVC sub-stations already configured in Photovoltaic Field 1 and Photovoltaic Field 2. On the premise that the reactive power regulation of the two sets of AVC sub-stations in Photovoltaic Field 1 and Photovoltaic Field 2 is sufficient, make the voltage difference between each pair of 35kV buses on the 35kV side of the 220kV collection station as small as possible, and make the reactive power output coordination between the 6 SVG devices connected to the 6 sections of 35kV buses (they cannot cancel each other out, and the output between each pair is as uniform as possible).

[0051] After the implementation of the above measures, it can effectively save the station power consumption rate and active power loss of the entire large base collection station and photovoltaic power station, avoid the "Two Rules" assessment by the dispatching department due to the occasional tripping of multiple SVG devices, and can also indirectly extend the service life of each SVG device, resulting in very significant economic benefits.

[0052] In this embodiment, an AVC regulation device for reactive power optimization of a photovoltaic power station is also provided. This device is used to implement the above-mentioned embodiment and preferred implementation manners, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0053] This embodiment provides an AVC regulation device for reactive power optimization of a photovoltaic power station. Based on the AVC regulation method for reactive power optimization of a photovoltaic power station in the above embodiment and any of its optional implementation manners, the device includes:

[0054] An acquisition module, configured to acquire the electrical data of each bus in the collection station and each photovoltaic power station;

[0055] The first judgment module is configured to judge whether the electrical data of each busbar in the collection station meets the first preset condition based on the electrical data of each busbar in the collection station and each photovoltaic power station. When it does not meet the condition, it judges whether the electrical data of each busbar in the collection station meets the second preset condition;

[0056] The second judgment module is configured to, when the electrical data of each busbar in the collection station does not meet the second preset condition, provide reactive power by the reactive power compensation device in the collection station;

[0057] The third judgment module is configured to, after the reactive power compensation device in the collection station provides reactive power, judge whether the electrical data of each busbar in the collection station meets the second preset condition. When it does not meet the condition, the photovoltaic inverter of the photovoltaic power station provides reactive power, and the shortage is provided by the reactive power compensation device of the photovoltaic power station;

[0058] The loop module is configured to judge whether the reactive power compensation device of the photovoltaic power station meets the third preset condition. If it meets the condition, it returns to the step of "judging whether the electrical data of each busbar in the collection station meets the second preset condition" until the electrical data of each busbar in the collection station meets the preset condition.

[0059] The further function descriptions of the above-mentioned various modules and units are the same as those in the corresponding embodiments above, and will not be elaborated here.

[0060] The AVC regulating device for reactive power optimization of the photovoltaic power station in this embodiment is presented in the form of functional units. Here, the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and a memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0061] The embodiment of the present invention also provides a computer device having the above-mentioned AVC regulating device for reactive power optimization of the photovoltaic power station.

[0062] Please refer to Figure 7 , Figure 7 which is a schematic structural diagram of a computer device provided by an optional embodiment of the present invention, as shown in Figure 7As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Each component communicates with each other using different buses and can be installed on a common motherboard or in other ways as needed. The processor can process instructions executed within the computer device, including instructions stored in the memory or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some alternative embodiments, if needed, multiple processors and / or multiple buses can be used together with multiple memories. Similarly, multiple computer devices can be connected, and each device provides part of the necessary operations (for example, as a server array, a set of blade servers, or a multi-processor system). Figure 7 In the figure, one processor 10 is taken as an example.

[0063] The processor 10 can be a central processing unit, a network processor, or a combination thereof. Among them, the processor 10 can further include a hardware chip. The above hardware chip can be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The above programmable logic device can be a complex programmable logic device, a field-programmable gate array, a generic array logic, or any combination thereof.

[0064] Among them, the memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiments.

[0065] The memory 20 can include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the computer device, etc. In addition, the memory 20 can include high-speed random access memory, and can also include non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some alternative embodiments, the memory 20 can optionally include a memory remotely set relative to the processor 10, and these remote memories can be connected to the computer device through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0066] The memory 20 can include volatile memory, such as random access memory; the memory can also include non-volatile memory, such as flash memory, a hard disk, or a solid-state drive; the memory 20 can also include a combination of the above types of memory.

[0067] The computer device further includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30, and the output device 40 can be connected through a bus or other means.Figure 7 Take the bus connection as an example.

[0068] The input device 30 can receive input digital or character information, and generate key signal inputs related to the user settings and function controls of the computer device, such as a touch screen, a keypad, a mouse, a trackpad, a touchpad, a pointing stick, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (e.g., an LED), and a haptic feedback device (e.g., a vibration motor), etc. The above display device includes but is not limited to a liquid crystal display, a light emitting diode, a display, and a plasma display. In some alternative embodiments, the display device may be a touch screen.

[0069] The embodiments of the present invention also provide a computer-readable storage medium. The methods according to the embodiments of the present invention can be implemented in hardware, firmware, or be implemented as computer code that can be recorded on a storage medium, or be implemented by downloading through a network the original computer code stored in a remote storage medium or a non-transitory machine-readable storage medium and to be stored in a local storage medium, so that the methods described herein can be stored in such software processes on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid-state drive, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by the computer, the processor, or the hardware, the methods shown in the above embodiments are implemented.

[0070] A part of the present invention can be applied as a computer program product, such as computer program instructions. When executed by a computer, through the operation of the computer, the methods and / or technical solutions according to the present invention can be called or provided. Those skilled in the art should be able to understand that the forms of existence of computer program instructions in a computer-readable medium include but are not limited to source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include but are not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to the computer.

[0071] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. An AVC regulation method for reactive power optimization of a photovoltaic station, characterized in that: The photovoltaic station includes a collection station and a plurality of photovoltaic stations, and the method includes: Obtaining electrical data of each busbar in the collection station and each photovoltaic field station; Based on the electrical data of each bus in the collection station and each photovoltaic field station, determine whether the electrical data of each bus in the collection station meets the first preset condition, and if not, determine whether the electrical data of each bus in the collection station meets the second preset condition; When the electrical data of each busbar in the collection station does not meet the second preset condition, the reactive power compensation device in the collection station provides reactive power; After the reactive power compensation device in the collection station provides reactive power, it is determined whether the electrical data of each bus in the collection station meets the second preset condition. If not, the photovoltaic inverter of the photovoltaic station provides reactive power, and the reactive power compensation device of the photovoltaic station provides reactive power for the shortfall; Determine whether the reactive power compensation device of the photovoltaic station meets the third preset condition. If so, return to the step of "determining whether the electrical data of each bus in the collection station meets the second preset condition" until the electrical data of each bus in the collection station meets the preset condition.

2. The AVC regulation method for reactive power optimization of photovoltaic stations according to claim 1 is characterized in that: The busbars of the collection station include: multiple sections of high-voltage busbars and multiple sections of low-voltage busbars, wherein each section of the low-voltage busbar is correspondingly connected to a low-voltage busbar of a photovoltaic field station.

3. The AVC regulation method for reactive power optimization of photovoltaic stations according to claim 2 is characterized in that: The process of judging whether the electrical data of each bus in the collection station meets the first preset condition includes: Determine whether the voltage of each bus in the collection station meets the target voltage value issued by the AVC master station.

4. The AVC regulation method for reactive power optimization of photovoltaic stations according to claim 2 is characterized in that: The process of judging whether the electrical data of each bus in the collection station meets the second preset condition includes: Comparing the voltage of each low-voltage bus in the collection station with the voltage of the low-voltage bus of the photovoltaic field station to which it is connected; When the voltage of a preset number of low-voltage busbars in the collection station is different from the voltage of the low-voltage busbars of the photovoltaic field stations to which they are connected, the second preset condition is not met.

5. The AVC regulation method for reactive power optimization of photovoltaic stations according to claim 2, characterized in that: The process of providing reactive power by the photovoltaic inverter of the photovoltaic station and providing reactive power by the reactive power compensation device of the photovoltaic station for the shortfall includes: Each AVC substation calculates the reactive power shortage of each low-voltage busbar of the photovoltaic station; Each AVC substation controls the photovoltaic inverter of the photovoltaic station to provide reactive power, and the reactive power compensation device of the photovoltaic station provides the reactive power that is insufficient.

6. The AVC regulation method for reactive power optimization of photovoltaic stations according to claim 2, characterized in that: The process of judging whether the reactive power compensation device of the photovoltaic station meets the third preset condition includes: Determine whether the reactive power output of the reactive power compensation device of the photovoltaic station reaches the target voltage issued by the AVC substation; If the target voltage sent by the AVC substation is reached, the third preset condition is met.

7. An AVC regulating device for reactive power optimization of a photovoltaic station, characterized in that: Based on the AVC regulation method for reactive power optimization of a photovoltaic station according to any one of claims 1 to 6, the device comprises: An acquisition module, used to acquire electrical data of each busbar in the collection station and each photovoltaic field station; A first judgment module is used to judge whether the electrical data of each bus in the collection station meets a first preset condition based on the electrical data of each bus in the collection station and each photovoltaic field station, and if not, to judge whether the electrical data of each bus in the collection station meets a second preset condition; A second judgment module is used for providing reactive power by the reactive power compensation device in the collection station when the electrical data of each bus in the collection station does not meet the second preset condition; The third judgment module is used to judge whether the electrical data of each bus in the collection station meets the second preset condition after the reactive power compensation device in the collection station provides reactive power. If it does not meet the second preset condition, the photovoltaic inverter of the photovoltaic station provides reactive power, and the reactive power compensation device of the photovoltaic station provides reactive power for the shortfall; The loop module is used to determine whether the reactive power compensation device of the photovoltaic station meets the third preset condition. If so, it returns to the step of "determining whether the electrical data of each bus in the collection station meets the second preset condition" until the electrical data of each bus in the collection station meets the preset condition.

8. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the AVC regulation method for reactive power optimization of a photovoltaic station according to any one of claims 1 to 6 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the AVC regulation method for reactive power optimization of a photovoltaic station according to any one of claims 1 to 6.

10. A computer program product, characterized in that The method comprises computer instructions, wherein the computer instructions are used to enable a computer to execute the AVC regulation method for reactive power optimization of a photovoltaic station according to any one of claims 1 to 6.

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