SVG reactive compensation low-voltage photovoltaic grid-connected cabinet

Abstract

The utility model provides an SVG reactive power compensation low-voltage photovoltaic grid-connected cabinet. An SVG reactive power compensation system is arranged in the low-voltage photovoltaic grid-connected cabinet. The SVG reactive power compensation system comprises an SVG module, an SVG reactive power controller and an SVG reactive power compensation sampling mutual inductor; the SVG reactive power controller is composed of a conversion circuit, a first calculation module, a second calculation module and a comparison circuit. The input end of the conversion circuit is connected with an SVG reactive compensation conversion mutual inductor and a busbar in a low-voltage photovoltaic grid-connected cabinet, the output end of the conversion circuit is connected with the input end of a first calculation module and the input end of a second calculation module, and the output end of the first calculation module is connected with the input end of a comparison circuit. The input end of the second calculation module is connected with the output end of the SVG module and the second input end of the comparison circuit and used for receiving the reference voltage, the input end of the comparison circuit is used for receiving the triangular wave signal, and the output end of the comparison circuit is connected with the input end of the SVG module.

Description

Technical Field

[0001] The utility model relates to the technical field of reactive power compensation, in particular to a low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation. Background Technique

[0002] With the rapid growth of photovoltaic power generation systems, many users have found that the power factor of the system does not meet the standard requirements after installing photovoltaic power generation equipment on the low-voltage side of the distribution system. This is because after installing photovoltaic power generation equipment in the distribution system, users start to obtain electric power (active power) from the photovoltaic system, while the active power obtained from the power grid decreases. If the reactive power provided by the user side does not change at this time, the reactive power obtained from the power grid will increase, which will lead to a decrease in the power factor of the system and cannot meet the standard requirements. Therefore, in order to solve this problem, it is necessary to introduce a reactive power compensation device SVG, which monitors the current signal on the user side (i.e., the current of the low-voltage incoming line main cabinet) through SVG to compensate the reactive power in the system, so that the power factor of the system meets the standard requirements.

[0003] However, the existing reactive power compensation device SVG and the photovoltaic grid-connected cabinet carrying photovoltaic power generation equipment are two independent systems. Generally, a small-capacity reactive power compensation device SVG is a wall-mounted box, which requires separate configuration of busbars and circuit breakers, and needs to be connected to the busbars of the photovoltaic grid-connected cabinet through cables. This not only increases the cost, but also there is no circuit breaker protection for the cable from the busbars of the photovoltaic grid-connected cabinet to the busbars of SVG, resulting in potential safety hazards. In addition, when the SVG converts signals, it is necessary to perform signal conversion at the user's low-voltage incoming line main cabinet, which requires on-site secondary wiring. The operation of secondary wiring requires construction personnel to have high professional skills, and at the same time, it is necessary to refer to the original secondary drawings of the user's low-voltage main cabinet to correctly wire, thus consuming time and effort. Content of the Utility Model

[0004] Based on the above deficiencies of the prior art, the utility model provides a low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation to solve the problem of high cost brought by the prior art.

[0005] In order to achieve the above object, the utility model provides the following technical solutions:

[0006]

[0007] The SVG reactive power compensation system includes an SVG module, an SVG reactive power controller, and an SVG reactive power compensation sampling current transformer;

[0008] ​The SVG reactive power compensation sampling transformer is arranged between the photovoltaic incoming line breaker group and the measuring transformer in the low-voltage photovoltaic grid-connected cabinet. The input end of the SVG reactive power compensation sampling transformer is connected to the output end of the measuring transformer, and the output end of the SVG reactive power compensation sampling transformer is connected to the input end of the photovoltaic incoming line breaker group;

[0009] The SVG reactive power controller consists of a conversion circuit, a first calculation module, a second calculation module and a comparison circuit;

[0010] The first input end of the conversion circuit is connected to the second output end of the SVG reactive power compensation conversion transformer. The second input end of the conversion circuit is connected to the bus bar in the low-voltage photovoltaic grid-connected cabinet. The current output end of the conversion circuit is respectively connected to the first input end of the first calculation module and the first input end of the second calculation module. The voltage output end of the conversion circuit is connected to the second input end of the first calculation module. The conversion circuit converts the three-phase current signal in the low-voltage photovoltaic grid-connected cabinet collected by the SVG reactive power compensation sampling transformer into a DC current signal, and converts the three-phase voltage signal of the bus bar into a DC voltage signal;

[0011] The output end of the first calculation module is connected to the first input end of the comparison circuit. The first calculation module calculates the reactive current by using the DC current signal and the DC voltage signal;

[0012] The second input end of the second calculation module is used to receive a reference voltage. The third input end of the second calculation module is connected to the output end of the SVG module. The output end of the second calculation module is connected to the second input end of the comparison circuit. The second calculation module calculates the active current signal by using the DC current signal, the reference voltage and the capacitor voltage input by the SVG module;

[0013] The third input end of the comparison circuit is connected to the triangular wave circuit in the low-voltage photovoltaic grid-connected cabinet. The output end of the comparison circuit is connected to the input end of the SVG module. The comparison circuit inputs the pulse signal of the compensation current obtained by comparing the triangular wave signal, the reactive current and the active current signal into the SVG module.

[0014] Optionally, in the above-mentioned low-voltage photovoltaic grid-connected cabinet with SVG reactive power compensation, the conversion circuit includes a current converter and a voltage converter;

[0015] The first input terminal of the current converter is connected to the A-phase coil of the SVG reactive power compensation sampling transformer; the second input terminal of the current converter is connected to the B-phase coil of the SVG reactive power compensation sampling transformer; the third input terminal of the current converter is connected to the C-phase coil of the SVG reactive power compensation sampling transformer; the first output terminal of the current converter is connected to the first input terminal of the first calculation module; the second output terminal of the current converter is connected to the first input terminal of the second calculation module;

[0016] The first input terminal of the voltage converter is connected to the A-phase of the bus bar in the low-voltage photovoltaic grid-connected cabinet; the second input terminal of the voltage converter is connected to the B-phase of the bus bar; the third input terminal of the voltage converter is connected to the C-phase of the bus bar; the voltage output terminal of the voltage converter is connected to the second input terminal of the first calculation module.

[0017] Optionally, in the above-mentioned low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation, the first calculation module includes a power calculation module and a current conversion module;

[0018] The first input terminal of the power calculation module is connected to the first output terminal of the conversion circuit; the second input terminal of the power calculation module is connected to the output terminal of the conversion circuit; the third input terminal of the power calculation module is used to receive the power factor angle; the output terminal of the power calculation module is connected to the input terminal of the current conversion module;

[0019] The output terminal of the current conversion module is connected to the first input terminal of the comparison circuit.

[0020] Optionally, in the above-mentioned low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation, the second calculation module includes a voltage comparison point, a first regulator, a current comparison point, and a second regulator;

[0021] The first input terminal of the voltage comparison point is connected to the output terminal of the SVG module; the second input terminal of the voltage comparison point is used to receive the reference voltage; the output terminal of the voltage comparison point is connected to the first regulator;

[0022] The output terminal of the first regulator is connected to the second input terminal of the current comparison point;

[0023] The first input terminal of the current comparison point is connected to the second output terminal of the conversion circuit; the output terminal of the current comparison point is connected to the input terminal of the second regulator;

[0024] The output terminal of the second regulator is connected to the second input terminal of the comparison circuit.

[0025] Optionally, in the above-mentioned low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation, the comparison circuit includes a target current converter and a comparator;

[0026] The first input terminal of the target current converter is connected to the output terminal of the first calculation module, the second input terminal of the target current converter is connected to the output terminal of the second calculation module, and the output terminal of the target current converter is connected to the first input terminal of the comparator;

[0027] The second input terminal of the comparator is connected to the triangular wave circuit in the low-voltage photovoltaic grid-connected cabinet, and the output terminal of the comparator is connected to the input terminal of the SVG module.

[0028] Optionally, in the above-mentioned low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation, a multi-functional meter, a knife switch, a metering bin, a photovoltaic special circuit breaker, an SVG incoming line circuit breaker, and a surge protector are also arranged in the low-voltage photovoltaic grid-connected cabinet;

[0029] The multi-functional meter is arranged between the busbar and the SVG reactive power controller in the low-voltage photovoltaic grid-connected cabinet. The input terminal of the multi-functional meter is connected to the first output terminal of the busbar, and the output terminal of the multi-functional meter is used to output the voltage signal collected on the busbar;

[0030] The first end of the knife switch is connected to the first output terminal of the busbar, and the second end of the knife switch is connected to the input terminal of the metering bin;

[0031] The first end of the photovoltaic special circuit breaker is connected to the output terminal of the metering bin, and the second end of the photovoltaic special circuit breaker is connected to the input terminal of the measuring current transformer;

[0032] The common end where the photovoltaic special circuit breaker is connected to the measuring current transformer is connected to the input terminal of the SVG incoming line circuit breaker;

[0033] The output terminal of the SVG incoming line circuit breaker is connected to the second input terminal of the SVG module;

[0034] The common end where the SVG reactive power compensation sampling current transformer is connected to the photovoltaic incoming line breaker group is connected to the input terminal of the surge protector;

[0035] The output terminal of the surge protector is grounded.

[0036] Optionally, in the above-mentioned low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation, the low-voltage photovoltaic grid-connected cabinet is arranged with a functional area, a metering area, and an SVG area;

[0037] Cabinet columns are vertically arranged at the corners of the low-voltage photovoltaic grid-connected cabinet, and multiple horizontally arranged cabinet cross-columns are connected between the cabinet columns. The back of the cabinet cross-columns is closely attached to the side wall of the low-voltage photovoltaic grid-connected cabinet. Multiple cabinet cross-columns are connected to the installation bracket, and the installation bracket is arranged inside the low-voltage photovoltaic grid-connected cabinet;

[0038] The functional area and the busbar are arranged on the top of the low-voltage photovoltaic grid-connected cabinet;

[0039] The metering area is arranged in the middle part of the low-voltage photovoltaic grid-connected cabinet;

[0040] The SVG area is arranged at the bottom of the low-voltage photovoltaic grid-connected cabinet.

[0041] Optionally, in the above low-voltage photovoltaic grid-connected cabinet with SVG reactive power compensation, a multifunctional meter, a knife switch, and an SVG reactive power controller are arranged in the functional area;

[0042] The multifunctional meter is arranged at the upper left position of the functional area, and the SVG reactive power controller is arranged at the upper right position of the functional area;

[0043] The knife switch is vertically installed on the side wall of the functional area through a column, and the column is connected to two horizontally arranged cabinet cross-columns.

[0044] Optionally, in the above low-voltage photovoltaic grid-connected cabinet with SVG reactive power compensation, a metering bin is arranged in the metering area;

[0045] The metering bin is arranged in the middle area of the metering area, and a metering current transformer and a metering meter are arranged in the metering bin.

[0046] Optionally, in the above low-voltage photovoltaic grid-connected cabinet with SVG reactive power compensation, a photovoltaic special circuit breaker, multiple photovoltaic incoming line circuit breakers, the SVG module, an SVG incoming line circuit breaker, a measuring current transformer, an SVG reactive power compensation sampling current transformer, and a surge protector are arranged in the SVG area;

[0047] The photovoltaic special circuit breaker is arranged at the upper front position of the SVG area through a cabinet cross-column;

[0048] Each photovoltaic incoming line circuit breaker and the SVG incoming line circuit breaker are arranged in parallel and horizontally at the rear side position of the SVG area, and the measuring current transformer, the SVG reactive power compensation sampling current transformer, and the surge protector are arranged at the upper position of the photovoltaic incoming line circuit breaker;

[0049] The SVG module is arranged at the bottom of the SVG area; wherein, an SVG handle, an SVG air outlet, an SVG exhaust fan, an SVG air inlet and an SVG intake fan are arranged in the SVG module.

[0050] A low-voltage photovoltaic grid-connected cabinet with SVG reactive power compensation provided by the present utility model. An SVG reactive power compensation system is arranged in the low-voltage photovoltaic grid-connected cabinet. The SVG reactive power compensation system includes an SVG module, an SVG reactive power controller and an SVG reactive power compensation sampling transformer. The SVG reactive power compensation sampling transformer is arranged between the photovoltaic incoming line breaker group and the measuring transformer in the low-voltage photovoltaic grid-connected cabinet. The input end of the SVG reactive power compensation sampling transformer is connected to the output end of the measuring transformer, and the output end of the SVG reactive power compensation sampling transformer is connected to the input end of the photovoltaic incoming line breaker group. The SVG reactive power controller is composed of a conversion circuit, a first calculation module, a second calculation module and a comparison circuit. The input ends of the conversion circuit are respectively connected to the SVG reactive power compensation conversion transformer and the busbar in the low-voltage photovoltaic grid-connected cabinet. The output end of the conversion circuit is respectively connected to the input ends of the first calculation module and the second calculation module. The output end of the first calculation module is connected to the input end of the comparison circuit. The second input end of the second calculation module is used to receive a reference voltage. The input ends of the second calculation module are respectively connected to the output end of the SVG module and the second input end of the comparison circuit. The input end of the comparison circuit is connected to the triangular wave circuit in the low-voltage photovoltaic grid-connected cabinet. The output end of the comparison circuit is connected to the input end of the SVG module. Thus, the SVG reactive power compensation system is arranged in the low-voltage photovoltaic grid-connected cabinet, saving the cable connection length between the SVG reactive power compensation system and the low-voltage photovoltaic grid-connected cabinet, and also not requiring additional time and labor, effectively saving labor costs and economic costs. On the other hand, the low-voltage photovoltaic grid-connected cabinet also has the function of reactive power compensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0052] Figure 1 It is a schematic structural diagram of a control circuit of a low-voltage photovoltaic grid-connected cabinet with SVG reactive power compensation provided by an embodiment of the present utility model;

[0053] Figure 2 It is a second schematic structural diagram of a control circuit of a low-voltage photovoltaic grid-connected cabinet with SVG reactive power compensation provided by an embodiment of the present utility model;

[0054] Figure 3The third structural schematic diagram of the control circuit of a low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation provided by an embodiment of the present utility model;

[0055] Figure 4 The fourth structural schematic diagram of the control circuit of a low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation provided by an embodiment of the present utility model;

[0056] Figure 5 The fifth structural schematic diagram of the control circuit of a low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation provided by an embodiment of the present utility model;

[0057] Figure 6 The overall structural schematic diagram of the control circuit of a low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation provided by an embodiment of the present utility model;

[0058] Figure 7 The structural schematic diagram of a low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation provided by an embodiment of the present utility model. Specific embodiments

[0059] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0060] In the present utility model, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0061] As can be seen from the background art, in the existing reactive power compensation device SVG and the photovoltaic grid-connected cabinet are two independent systems. Generally, a small-capacity reactive power compensation device SVG is a wall-mounted box, which requires separate configuration of busbars and circuit breakers, and needs to be connected to the busbars of the photovoltaic grid-connected cabinet through cables, resulting in higher costs.

[0062] Therefore, the embodiment of the present utility model provides a low-voltage photovoltaic grid-connected cabinet with SVG reactive power compensation. An SVG reactive power compensation system is arranged in the low-voltage photovoltaic grid-connected cabinet, thereby saving the length of installation cables and reducing cost consumption.

[0063] Therefore, referring to Figure 1 , a schematic structural diagram of a control circuit of a low-voltage photovoltaic grid-connected cabinet with SVG reactive power compensation provided by the embodiment of the present utility model is shown. An SVG reactive power compensation system is arranged in the low-voltage photovoltaic grid-connected cabinet.

[0064] Specifically, the SVG reactive power compensation system includes an SVG module 7, an SVG reactive power controller 6, and an SVG reactive power compensation sampling current transformer 10. Among them, the SVG module 7 is connected to the busbar in the low-voltage photovoltaic grid-connected cabinet through a circuit breaker, saving the cable connection length between the SVG module 7 and the busbar. Moreover, the addition of the circuit breaker can also improve the safety of the low-voltage photovoltaic grid-connected cabinet.

[0065] The SVG reactive power compensation sampling current transformer 10 is arranged between the photovoltaic incoming line breaker group and the measuring current transformer 9 in the low-voltage photovoltaic grid-connected cabinet. The input end of the SVG reactive power compensation sampling current transformer 10 is connected to the output end of the measuring current transformer 9, and the output end of the SVG reactive power compensation sampling current transformer 10 is connected to the input end of the photovoltaic incoming line breaker group.

[0066] In some embodiments, the photovoltaic incoming line breaker group is composed of 3 photovoltaic incoming line breakers 4, and the SVG module 7 is 100 kvar, matching a 400 kW photovoltaic grid connection point.

[0067] In some embodiments, the SVG reactive power controller 6 adopts a new type of reactive power controller. Of course, other reactive power controllers can also be adopted, which can be specifically set according to requirements.

[0068] The SVG reactive power controller 6 is composed of a conversion circuit 11, a first calculation module 12, a second calculation module 13, and a comparison circuit 14.

[0069] The first input end of the conversion circuit 11 is connected to the second output end of the SVG reactive power compensation conversion current transformer. The second input end of the conversion circuit 11 is connected to the busbar in the low-voltage photovoltaic grid-connected cabinet. The current output end of the conversion circuit 11 is respectively connected to the first input end of the first calculation module 12 and the first input end of the second calculation module 13. The voltage output end of the conversion circuit 11 is connected to the second input end of the first calculation module 12. The conversion circuit 11 converts the three-phase current signal in the low-voltage photovoltaic grid-connected cabinet collected by the SVG reactive power compensation sampling current transformer 10 into a DC current signal, and converts the three-phase voltage signal of the busbar into a DC voltage signal.

[0070] The output terminal of the first calculation module 12 is connected to the first input terminal of the comparison circuit 14. The first calculation module 12 calculates the reactive current using the DC current signal and the DC voltage signal.

[0071] The second input terminal of the second calculation module 13 is used to receive the reference voltage. The third input terminal of the second calculation module 13 is connected to the output terminal of the SVG module 7. The output terminal of the second calculation module 13 is connected to the second input terminal of the comparison circuit 14. The second calculation module 13 calculates the active current signal using the DC current signal, the reference voltage, and the capacitor voltage input by the SVG module 7.

[0072] The third input terminal of the comparison circuit 14 is connected to the triangular wave circuit in the low-voltage photovoltaic grid-connected cabinet. The output terminal of the comparison circuit 14 is connected to the input terminal of the SVG module 7. The comparison circuit 14 inputs the pulse signal of the compensation current obtained by comparing the triangular wave signal, the reactive current, and the active current signal into the SVG module 7.

[0073] It should be noted that the output terminal of the SVG module 7 is also connected to the SVG reactive power compensation sampling current transformer 10 and the busbar, so that the control circuit of the low-voltage photovoltaic grid-connected cabinet forms a closed loop.

[0074] Based on the control circuit of the SVG reactive power controller 6 described in the above-mentioned present invention, in the low-voltage photovoltaic grid-connected cabinet, the current of the low-voltage photovoltaic grid-connected cabinet can be collected through the SVG reactive power compensation sampling current transformer 10 first, and the voltage of the low-voltage photovoltaic grid-connected cabinet can be collected through the busbar. Thus, the reactive current iq* of the photovoltaic in this grid-connected cabinet is calculated. This current iq* is used as the reactive current given signal of the SVG reactive power controller 6 to control the SVG module 7 to output the corresponding reactive current to perform reactive power compensation on the system. This control strategy can provide reactive power that meets the power factor target value in real time according to the real-time active output of the photovoltaic. It makes up for the reactive power gap on the user side system caused by the user's use of photovoltaic active power. This control circuit can realize current sampling of the SVG control system from the photovoltaic grid-connected cabinet.

[0075] In some embodiments, in combination with Figure 1 , see Figure 2 , a second structural schematic diagram of the control circuit of a low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation is shown. The conversion circuit 11 includes a current converter 21 and a voltage converter 22.

[0076] The first input terminal of the current converter 21 is connected to the A-phase coil of the SVG reactive power compensation sampling transformer 10, the second input terminal of the current converter 21 is connected to the B-phase coil of the SVG reactive power compensation sampling transformer 10, the third input terminal of the current converter 21 is connected to the C-phase coil of the SVG reactive power compensation sampling transformer 10, the first output terminal of the current converter 21 is connected to the first input terminal of the first calculation module 12, and the second output terminal of the current converter 21 is connected to the first input terminal of the second calculation module 13.

[0077] It should be noted that the current converter 21 converts the three-phase current signals in the low-voltage photovoltaic grid-connected cabinet collected by the SVG reactive power compensation sampling transformer 10 into active current signals id and reactive current signals iq, which is beneficial for the second regulator in the subsequent second calculation module 13 to accurately control the output signal based on the active current signal id.

[0078] The first input terminal of the voltage-current converter 22 is connected to the A-phase of the busbar in the low-voltage photovoltaic grid-connected cabinet, the second input terminal of the voltage-current converter 22 is connected to the B-phase of the busbar, the third input terminal of the voltage-current converter 22 is connected to the C-phase of the busbar, and the voltage output terminal of the voltage-current converter 22 is connected to the second input terminal of the first calculation module 12. Specifically, the voltage output terminal of the voltage-current converter 22 is connected to the second input terminal of the second comparison point in the first calculation module 12.

[0079] It should also be noted that the voltage-current converter 22 converts the three-phase voltage signals in the low-voltage photovoltaic grid-connected cabinet collected by the busbar into DC voltage signals.

[0080] In the low-voltage grid-connected cabinet disclosed in the present utility model, the AC signals of the collected low-voltage grid-connected cabinet are converted into DC signals through the current converter 21 and the voltage converter 22, which can improve the stability, reliability of the low-voltage grid-connected cabinet and the control accuracy in the subsequent second calculation module 13.

[0081] In some embodiments, in combination with Figure 1 and Figure 2 , referring to Figure 3 , a third structural schematic diagram of the control circuit of a low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation is shown. The first calculation module 12 includes a power calculation module 31 and a current conversion module 32.

[0082] The first input terminal of the power calculation module 31 is connected to the first output terminal of the conversion circuit 11, the second input terminal of the power calculation module 31 is connected to the output terminal of the conversion circuit 11, the third input terminal of the power calculation module 31 is used to receive the power factor angle, and the output terminal of the power calculation module 31 is connected to the input terminal of the current conversion module 32.

[0083] It should be noted that the power calculation module 31 calculates the active power Ps using the active current signal id and the DC voltage signal, and inputs the active power Ps and the power factor angle cosα (α is the power factor angle) into the current conversion module 32.

[0084] Specifically, the calculation formula for the active power Ps is: Ps = 3 / 2 * Ud * id. Where Ud is the DC voltage signal and id is the active current signal.

[0085] The output end of the current conversion module 32 is connected to the first input end of the comparison circuit 14. Specifically, the output end of the current conversion module 32 is connected to the first input end of the target current converter in the comparison circuit 14.

[0086] It should also be noted that the current conversion module 32 calculates the reactive power demand Q using the active power Ps and the power factor angle cosα, converts the reactive power demand Q into a reactive current iq*, and inputs the reactive current iq* into the target current converter. It should be emphasized that iq* is for reactive power control to compensate for the missing reactive current in the low-voltage PV grid-connected cabinet.

[0087] Specifically, the calculation formula for the reactive power demand Q is: Q = Ps * tanα. Where Ps is the active power, and tanα can be obtained by looking up the table according to the given cosα.

[0088] In the low-voltage grid-connected cabinet disclosed in the present utility model, the power calculation module 31 and the current conversion module 32 can effectively calculate the reactive current iq* required by the low-voltage PV grid-connected cabinet, so that the subsequent SVG module 7 can output the compensation current required by the low-voltage grid-connected cabinet according to the accurate reactive current iq*.

[0089] In some embodiments, in combination with Figure 1 、 Figure 2 ,and Figure 3 ,refer to Figure 4 ,shows a fourth structural schematic diagram of the control circuit of a low-voltage PV grid-connected cabinet with SVG reactive power compensation. The second calculation module 13 includes a voltage comparison point 41, a first regulator 42, a current comparison point 43, and a second regulator 44.

[0090] The first input end of the voltage comparison point 41 is connected to the output end of the SVG module 7. The second input end of the voltage comparison point 41 is used to receive the reference voltage, and the output end of the voltage comparison point 41 is connected to the first regulator 42.

[0091] It can be understood that the voltage comparison point 41 calculates the difference between the reference voltage and the capacitor voltage input to the SVG module 7 to obtain the voltage difference, and inputs it into the first regulator 42.

[0092] An output terminal of the first regulator 42 is connected to a second input terminal of the current comparison point 43 .

[0093] It is understandable that the first regulator 42 is used to use the voltage difference as an input signal for active power control, and to obtain an active current reference signal i according to the input signal. dref , and input to the current comparison point 43.

[0094] A first input terminal of the current comparison point 43 is connected to the second output terminal of the conversion circuit 11 , and an output terminal of the current comparison point 43 is connected to an input terminal of the second regulator 44 .

[0095] Specifically, the current comparison point 43 calculates the active current reference signal i dref The difference between the reactive current id and the reactive current id is used to obtain a current difference, and the current difference is sent to the second regulator 44.

[0096] The output terminal of the second regulator 44 is connected to the second input terminal of the comparison circuit 14 . Specifically, the output terminal of the second regulator 44 is connected to the second input terminal of the target current converter in the comparison circuit 14 .

[0097] Specifically, the second regulator 44 is configured to regulate the current difference into the active current signal id*.

[0098] In the low-voltage grid-connected cabinet disclosed in the present invention, the active current signal id* can be accurately obtained through the voltage comparison point 41, the first regulator 42, the current comparison point 43, and the second regulator 44, thereby maintaining the overall voltage on the DC side of the SVG module 7 at a reference value, thereby achieving active power control of the low-voltage photovoltaic grid-connected cabinet and achieving voltage stability control on the DC side of the SVG.

[0099] In some embodiments, combined Figure 1 、 Figure 2 、 Figure 3 ,as well as Figure 4 , see Figure 5 , shows a fifth structural schematic diagram of a control circuit of a low-voltage photovoltaic grid-connected cabinet with SVG reactive power compensation, where the comparison circuit 14 includes a target current converter 51 and a comparator 52.

[0100] The first input terminal of the target current converter 51 is connected to the output terminal of the first calculation module 12, the second input terminal of the target current converter is connected to the output terminal of the second calculation module 13, and the output terminal of the target current converter 51 is connected to the first input terminal of the comparator 52.

[0101] It can be understood that the target current converter 51 performs inverse park transformation on the active current signal and the reactive current to obtain a three-phase current signal.

[0102] The second input terminal of the comparator 52 is connected to the triangular wave circuit in the low-voltage photovoltaic grid-connected cabinet, and the output terminal of the comparator 52 is connected to the input terminal of the SVG module 7.

[0103] It can be understood that the comparator 52 inputs the compensated current obtained by comparing the three-phase current signal and the triangular wave signal into the SVG module 7, so that the SVG module 7 outputs the compensated current.

[0104] Specifically, the comparison between the three-phase current signal and the triangular signal is the SPWM technology. The triangular wave acts as a carrier wave in SPWM. This triangular wave is an isosceles triangular wave. Because the horizontal width and height of any point on the isosceles triangular wave are linearly related and symmetric about the left and right, when it intersects with any gently changing modulation signal wave, if the on-off of the switching device in the circuit is controlled at the intersection moment, pulses with widths proportional to the amplitude of the signal wave can be obtained. The pulse signal controls the turn-off of the inverter bridge module in the SVG. When the modulation signal wave is a sine wave, the obtained is the SPWM wave, that is, the compensated current.

[0105] In the low-voltage grid-connected cabinet disclosed in the present utility model, the three-phase current signal can be obtained through the target current converter 51 and the comparator 52, and the SVG module 7 is controlled to output the corresponding compensated current to perform reactive power compensation on the low-voltage photovoltaic grid-connected cabinet, thereby realizing the ability to adjust according to the real-time active output of the photovoltaic and making up for the reactive power gap on the user side system caused by the user's use of photovoltaic active power.

[0106] In some embodiments, in combination with Figure 1 , referring to Figure 6 , a schematic diagram of the overall structure of a control circuit of a low-voltage photovoltaic grid-connected cabinet with SVG reactive power compensation provided by an embodiment of the present utility model is shown. A multi-functional meter 5, a knife switch 1, a metering bin 2, a photovoltaic special circuit breaker 3, an SVG incoming line circuit breaker 8, and a surge protector 11 are also arranged in the low-voltage photovoltaic grid-connected cabinet.

[0107] The multi-functional meter 5 is arranged between the busbar and the SVG reactive power controller 6 in the low-voltage photovoltaic grid-connected cabinet. The input terminal of the multi-functional meter 5 is connected to the first output terminal of the busbar. The output terminal of the multi-functional meter 5 is used to output the voltage signal collected on the busbar and the current signal of the measurement transformer collected, indicating that the input terminal of the multi-functional meter 5 is also connected to the input terminal of the measurement transformer 9.

[0108] It can be understood that the multi-functional meter 5 in the low-voltage photovoltaic grid-connected cabinet can not only provide basic electric energy metering functions, but also support advanced functions such as power quality analysis, fault diagnosis, and remote monitoring.

[0109] The first end of the knife switch 1 is connected to the first output terminal of the busbar, and the second end of the knife switch 1 is connected to the input terminal of the metering bin 2.

[0110] It is understandable that the knife switch 1 is used to isolate and connect circuits in the low-voltage photovoltaic grid-connected cabinet, and also has overload and short-circuit protection functions.

[0111] The first end of the photovoltaic special circuit breaker 3 is connected to the output end of the metering bin 2, and the second end of the photovoltaic special circuit breaker 3 is connected to the input end of the measuring mutual inductor 9.

[0112] Specifically, the photovoltaic special circuit breaker 3 is used in the low-voltage photovoltaic grid-connected cabinet to ensure the safe operation of the system of the low-voltage photovoltaic grid-connected cabinet, prevent overload and short circuit, and ensure compliance with electrical safety standards.

[0113] The common end where the photovoltaic special circuit breaker 3 is connected to the measuring mutual inductor 9 is connected to the input end of the SVG incoming line circuit breaker 8.

[0114] The output end of the SVG incoming line circuit breaker 8 is connected to the second input end of the SVG module 7.

[0115] Specifically, the SVG incoming line circuit breaker 8 is used in the low-voltage photovoltaic grid-connected cabinet to protect and control the circuit of the SVG module 7, ensure that it can effectively access or disconnect from the power grid during normal operation, and protect the safe operation of the SVG module 7 and the power grid in case of abnormalities.

[0116] It is understandable that the measuring mutual inductor 9 is used in the low-voltage photovoltaic grid-connected cabinet to effectively monitor, measure and protect the current in the low-voltage photovoltaic grid-connected cabinet, ensuring the safe operation of the low-voltage photovoltaic grid-connected cabinet and the normal use of electric energy.

[0117] The common end where the SVG reactive power compensation sampling mutual inductor 10 is connected to the photovoltaic incoming line breaker group is connected to the input end of the surge protector 11.

[0118] The output end of the surge protector 11 is grounded.

[0119] It is understandable that the surge protector 11 is used in the low-voltage photovoltaic grid-connected cabinet to protect the low-voltage photovoltaic grid-connected cabinet from overvoltage damage by absorbing or guiding voltage surges, ensuring the safe operation of the power system and the long-term reliability of the equipment.

[0120] In the embodiment of the present utility model, through the multifunctional meter 5, the knife switch 1, the metering bin 2, the photovoltaic special circuit breaker 3, the SVG incoming line circuit breaker 8, and the surge protector 11, the safe operation of the power system and the SVG module 7 in the low-voltage photovoltaic grid-connected cabinet can be ensured, thereby improving the safety of the low-voltage photovoltaic grid-connected cabinet.

[0121] In some embodiments, referring to Figure 7 , a schematic structural diagram of a low-voltage photovoltaic grid-connected cabinet with SVG reactive power compensation provided by the embodiment of the present utility model is shown. The low-voltage photovoltaic grid-connected cabinet is provided with a functional area, a metering area, and an SVG area.

[0122] Specifically, Figure 7 the front view, rear view, and side view of the low-voltage grid connection cabinet are shown. According to Figure 7 it can be seen that:

[0123] Cabinet columns are vertically arranged at the corners of the low-voltage photovoltaic grid connection cabinet, and multiple horizontally arranged cabinet crossbars are connected between the cabinet columns. The back of the cabinet crossbars is closely attached to the side wall of the low-voltage photovoltaic grid connection cabinet. Multiple cabinet crossbars are connected to the installation bracket, and the installation bracket is arranged inside the low-voltage photovoltaic grid connection cabinet.

[0124] The functional area and the busbar are arranged at the top of the low-voltage photovoltaic grid connection cabinet.

[0125] The metering area is arranged in the middle part of the low-voltage photovoltaic grid connection cabinet.

[0126] The SVG area is arranged at the bottom of the low-voltage photovoltaic grid connection cabinet.

[0127] It should be noted that the functional area is mainly the area where various functional devices in the low-voltage photovoltaic grid connection cabinet are located, used to exert the functions of the low-voltage photovoltaic grid connection cabinet. The metering area is mainly used to measure the values of various devices in the low-voltage photovoltaic grid connection cabinet and monitor whether the values corresponding to various devices meet the reference values, so as to ensure accuracy. The SVG area is mainly used to output compensation current to the low-voltage photovoltaic grid connection cabinet, so that the low-voltage photovoltaic grid connection cabinet has the function of reactive power compensation.

[0128] In some embodiments, in combination with Figure 7 the functional area is described. A multifunction meter 5, a knife switch 1, and an SVG reactive power controller 6 are arranged in the functional area.

[0129] The multifunction meter 5 is arranged at the upper left position of the functional area, and the SVG reactive power controller 6 is arranged at the upper right position of the functional area.

[0130] The knife switch 1 is vertically installed on the side wall of the functional area through a column, and the column is connected to two horizontally arranged cabinet crossbars.

[0131] It should be noted that the knife switch 1 refers to Figure 6 the knife switch 1 in Figure 6 and they have the same meaning. Among them, the explanations of the multifunction meter 5 and the knife switch 1 can be referred to the explanations described in

[0132] It should also be noted that by arranging the SVG var controller 6 in the low-voltage grid connection cabinet, it can receive the three-phase current signals collected by the SVG var compensation sampling current transformer 10 in the low-voltage grid connection cabinet and the three-phase voltage signals collected by the busbar, and based on the three-phase voltage signals and three-phase current signals, the SVG var controller 6 obtains three-phase current control signals and transmits them to the SVG module 7, thereby realizing the compensation of the current gap on the user side.

[0133] In some embodiments, a metering bin 2 is arranged in the metering area.

[0134] The metering bin 2 is arranged in the middle area of the metering area, and a metering current transformer and a meter are provided in the metering bin 2.

[0135] It should be noted that a metering current transformer and a meter are arranged in the metering bin 2 to protect the integrity and accuracy of each device in the low-voltage grid connection cabinet, and at the same time improve the working efficiency and compliance of each device.

[0136] In some embodiments, in combination Figure 7 Describing the SVG area, a dedicated photovoltaic circuit breaker 3, a plurality of photovoltaic incoming line circuit breakers 4, an SVG module 7, an SVG incoming line circuit breaker 8, a measuring current transformer 9, an SVG var compensation sampling current transformer 10, and a surge protector 11 are arranged in the SVG area.

[0137] The dedicated photovoltaic circuit breaker 3 is arranged at the upper front position of the SVG area through the cabinet cross column.

[0138] Each photovoltaic incoming line circuit breaker 4 and the SVG incoming line circuit breaker 8 are arranged in parallel and horizontally at the rear side position of the SVG area, and the measuring current transformer 9, the SVG var compensation sampling current transformer 10, and the surge protector 11 are arranged at the upper position of the photovoltaic incoming line circuit breaker 4.

[0139] Specifically, the photovoltaic incoming line circuit breaker 4 in the low-voltage photovoltaic grid connection cabinet is used to provide overload, short-circuit protection and personal safety protection to ensure the safe and stable operation of the SVG system, and at the same time enhance the reliability and maintainability of the SVG system.

[0140] The SVG module 7 is arranged at the bottom of the SVG area. Among them, an SVG handle 12, an SVG exhaust port 13, an SVG exhaust fan 14, an SVG air inlet 15, and an SVG intake fan 16 are arranged in the SVG module 7.

[0141] It should be noted that in the present utility model, the SVG module 7 in the SVG area is integrated into the low-voltage photovoltaic grid-connected cabinet in a drawer type for convenient operation, maintenance and replacement of the module. A stainless steel wire mesh air outlet is provided at the front door of the low-voltage photovoltaic grid-connected cabinet, an exhaust fan is provided inside the wire mesh, and a stainless steel wire mesh air outlet is provided on the side plate of the low-voltage photovoltaic grid-connected cabinet, and an intake fan is provided inside the wire mesh. This serves to facilitate the ventilation and heat dissipation of the SVG module 7.

[0142] A low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation provided by the present utility model is equipped with an SVG reactive power compensation system inside. The SVG reactive power compensation system includes an SVG module, an SVG reactive power controller and an SVG reactive power compensation sampling transformer. The SVG reactive power compensation sampling transformer is arranged between the photovoltaic incoming line breaker group and the measuring transformer in the low-voltage photovoltaic grid-connected cabinet. The input end of the SVG reactive power compensation sampling transformer is connected to the output end of the measuring transformer, and the output end of the SVG reactive power compensation sampling transformer is connected to the input end of the photovoltaic incoming line breaker group. The SVG reactive power controller is composed of a conversion circuit, a first calculation module, a second calculation module and a comparison circuit. The input ends of the conversion circuit are respectively connected to the SVG reactive power compensation conversion transformer and the busbar in the low-voltage photovoltaic grid-connected cabinet. The output end of the conversion circuit is respectively connected to the input ends of the first calculation module and the second calculation module. The output end of the first calculation module is connected to the input end of the comparison circuit. The second input end of the second calculation module is used to receive a reference voltage. The input ends of the second calculation module are respectively connected to the output end of the SVG module and the second input end of the comparison circuit. The input end of the comparison circuit is connected to the triangular wave circuit in the low-voltage photovoltaic grid-connected cabinet, and the output end of the comparison circuit is connected to the input end of the SVG module. Thus, the SVG reactive power compensation system is arranged in the low-voltage photovoltaic grid-connected cabinet, saving the cable connection length between the SVG reactive power compensation system and the low-voltage photovoltaic grid-connected cabinet, and also eliminating the need for additional time and manpower, effectively saving labor costs and economic costs. On the other hand, the low-voltage photovoltaic grid-connected cabinet also has the function of reactive power compensation.

[0143] Those skilled in the art can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present utility model.

[0144] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-voltage photovoltaic grid-connected cabinet for SVG reactive power compensation, characterized in that An SVG reactive power compensation system is installed in the low-voltage photovoltaic grid-connected cabinet; The SVG reactive power compensation system includes an SVG module, an SVG reactive power controller, and an SVG reactive power compensation sampling transformer; The SVG reactive power compensation sampling transformer is arranged between the photovoltaic incoming line breaker group and the measuring transformer in the low-voltage photovoltaic grid-connected cabinet. The input end of the SVG reactive power compensation sampling transformer is connected to the output end of the measuring transformer, and the output end of the SVG reactive power compensation sampling transformer is connected to the input end of the photovoltaic incoming line breaker group; The SVG reactive power controller is composed of a conversion circuit, a first calculation module, a second calculation module, and a comparison circuit; The first input end of the conversion circuit is connected to the second output end of the SVG reactive power compensation conversion transformer. The second input end of the conversion circuit is connected to the busbar in the low-voltage photovoltaic grid-connected cabinet. The current output end of the conversion circuit is respectively connected to the first input end of the first calculation module and the first input end of the second calculation module. The voltage output end of the conversion circuit is connected to the second input end of the first calculation module. The conversion circuit converts the three-phase current signal in the low-voltage photovoltaic grid-connected cabinet collected by the SVG reactive power compensation sampling transformer into a DC current signal, and converts the three-phase voltage signal of the busbar received into a DC voltage signal; The output end of the first calculation module is connected to the first input end of the comparison circuit. The first calculation module calculates the reactive current using the DC current signal and the DC voltage signal; The second input end of the second calculation module is used to receive a reference voltage. The third input end of the second calculation module is connected to the output end of the SVG module. The output end of the second calculation module is connected to the second input end of the comparison circuit. The second calculation module calculates the active current signal using the DC current signal, the reference voltage, and the capacitor voltage input by the SVG module; The third input end of the comparison circuit is connected to the triangular wave circuit in the low-voltage photovoltaic grid-connected cabinet. The output end of the comparison circuit is connected to the input end of the SVG module. The comparison circuit inputs the pulse signal of the compensation current obtained by comparing the triangular wave signal, the reactive current, and the active current signal into the SVG module; 2. The low-voltage photovoltaic grid-connected cabinet according to claim 1, wherein The conversion circuit includes a current converter and a voltage converter; The first input end of the current converter is connected to the A-phase coil of the SVG reactive power compensation sampling transformer. The second input end of the current converter is connected to the B-phase coil of the SVG reactive power compensation sampling transformer. The third input end of the current converter is connected to the C-phase coil of the SVG reactive power compensation sampling transformer. The first output end of the current converter is connected to the first input end of the first calculation module. The second output end of the current converter is connected to the first input end of the second calculation module; The first input terminal of the voltage converter is connected to the A phase of the busbar in the low-voltage photovoltaic grid-connected cabinet, the second input terminal of the voltage converter is connected to the B phase of the busbar, the third input terminal of the voltage converter is connected to the C phase of the busbar, and the voltage output terminal of the voltage converter is connected to the second input terminal of the first calculation module.

3. The low-voltage photovoltaic grid-connected cabinet according to claim 1, characterized in that, The first calculation module includes a power calculation module and a current conversion module; The first input terminal of the power calculation module is connected to the first output terminal of the conversion circuit, the second input terminal of the power calculation module is connected to the output terminal of the conversion circuit, the third input terminal of the power calculation module is used to receive the power factor angle, and the output terminal of the power calculation module is connected to the input terminal of the current conversion module; The output terminal of the current conversion module is connected to the first input terminal of the comparison circuit.

4. The low-voltage photovoltaic grid-connected cabinet according to claim 1, characterized in that, The second calculation module includes a voltage comparison point, a first regulator, a current comparison point, and a second regulator; The first input terminal of the voltage comparison point is connected to the output terminal of the SVG module, the second input terminal of the voltage comparison point is used to receive the reference voltage, and the output terminal of the voltage comparison point is connected to the first regulator; The output terminal of the first regulator is connected to the second input terminal of the current comparison point; The first input terminal of the current comparison point is connected to the second output terminal of the conversion circuit, and the output terminal of the current comparison point is connected to the input terminal of the second regulator; The output terminal of the second regulator is connected to the second input terminal of the comparison circuit.

5. The low-voltage photovoltaic grid-connected cabinet according to claim 1, characterized in that, The comparison circuit includes a target current converter and a comparator; The first input terminal of the target current converter is connected to the output terminal of the first calculation module, the second input terminal of the target current converter is connected to the output terminal of the second calculation module, and the output terminal of the target current converter is connected to the first input terminal of the comparator; The second input terminal of the comparator is connected to the triangular wave circuit in the low-voltage photovoltaic grid-connected cabinet, and the output terminal of the comparator is connected to the input terminal of the SVG module.

6. The low-voltage photovoltaic grid-connected cabinet according to claim 1, wherein, A multi-functional meter, a knife switch, a metering bin, a photovoltaic special circuit breaker, an SVG incoming line circuit breaker, and a surge protector are also installed in the low-voltage photovoltaic grid-connected cabinet; The multi-functional meter is arranged between the busbar in the low-voltage photovoltaic grid-connected cabinet and the SVG reactive power controller. The input terminal of the multi-functional meter is connected to the first output terminal of the busbar, and the output terminal of the multi-functional meter is used to output the voltage signal collected on the busbar; The first end of the knife switch is connected to the first output terminal of the busbar, and the second end of the knife switch is connected to the input terminal of the metering bin; The first end of the photovoltaic special circuit breaker is connected to the output terminal of the metering bin, and the second end of the photovoltaic special circuit breaker is connected to the input terminal of the measurement current transformer; The common end where the photovoltaic special circuit breaker is connected to the measurement current transformer is connected to the input terminal of the SVG incoming line circuit breaker; The output terminal of the SVG incoming line circuit breaker is connected to the second input terminal of the SVG module; The common terminal of the SVG reactive power compensation sampling transformer connected to the photovoltaic incoming line breaker group is connected to the input end of the surge protector; The output end of the surge protector is grounded.

7. The low-voltage photovoltaic grid-connected cabinet according to claim 1, wherein The low-voltage photovoltaic grid-connected cabinet is provided with a functional area, a metering area, and an SVG area; Cabinet columns are vertically arranged at the corners of the low-voltage photovoltaic grid-connected cabinet, and multiple horizontally arranged cabinet crossbars are connected between the cabinet columns. The back of the cabinet crossbars is closely attached to the side wall of the low-voltage photovoltaic grid-connected cabinet. Multiple cabinet crossbars are connected to the mounting bracket, and the mounting bracket is arranged inside the low-voltage photovoltaic grid-connected cabinet; The functional area and the busbar are arranged at the top of the low-voltage photovoltaic grid-connected cabinet; The metering area is arranged in the middle part of the low-voltage photovoltaic grid-connected cabinet; The SVG area is arranged at the bottom of the low-voltage photovoltaic grid-connected cabinet.

8. The low-voltage photovoltaic grid-connected cabinet according to claim 7, characterized in that, A multi-functional meter, a knife switch, and an SVG reactive power controller are arranged in the functional area; The multi-functional meter is arranged at the upper left position of the functional area, and the SVG reactive power controller is arranged at the upper right position of the functional area; The knife switch is vertically installed on the side wall of the functional area through a column, and the column is connected to two horizontally arranged cabinet crossbars.

9. The low-voltage photovoltaic grid-connected cabinet according to claim 7, characterized in that, A metering bin is arranged in the metering area; The metering bin is arranged in the middle area of the metering area, and a metering transformer and a meter are arranged in the metering bin.

10. The low-voltage photovoltaic grid-connected cabinet according to claim 7, wherein, A photovoltaic special circuit breaker, multiple photovoltaic incoming line breakers, the SVG module, an SVG incoming circuit breaker, a measuring transformer, an SVG reactive power compensation sampling transformer, and a surge protector are arranged in the SVG area; The photovoltaic special circuit breaker is arranged at the upper front position of the SVG area through a cabinet crossbar; Each photovoltaic incoming line breaker and the SVG incoming circuit breaker are arranged in parallel and horizontally at the rear side of the SVG area, and the measuring transformer, the SVG reactive power compensation sampling transformer, and the surge protector are arranged above the photovoltaic incoming line breaker; The SVG module is arranged at the bottom of the SVG area; among them, an SVG handle, an SVG air outlet, an SVG exhaust fan, an SVG air inlet, and an SVG intake fan are arranged in the SVG module.

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