CN117318080B - SVG and capacitor hybrid compensation control system and method - Google Patents

SVG and capacitor hybrid compensation control system and method Download PDF

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Publication number
CN117318080B
CN117318080B CN202311618811.3A CN202311618811A CN117318080B CN 117318080 B CN117318080 B CN 117318080B CN 202311618811 A CN202311618811 A CN 202311618811A CN 117318080 B CN117318080 B CN 117318080B
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reactive power
network side
power
svg
level difference
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CN117318080A (en
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王伟胜
李阳春
黄海宇
马庆华
王莉
李帮家
刘燕红
王文涛
王连胜
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HANGZHOU DECHENG ELECTRIC POWER TECHNOLOGY CO LTD
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HANGZHOU DECHENG ELECTRIC POWER TECHNOLOGY CO LTD
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention provides a control system and a method for SVG and capacitor hybrid compensation, comprising the following steps: a power grid, a load, SVG and a plurality of intelligent power capacitors which are respectively connected with the power grid; when the SVG detects reactive load change, starting operation; and the plurality of intelligent power capacitors are used for comparing the reactive power of the current network side with the capacitance compensation level difference after the SVG starts to operate, so as to obtain a comparison result, and controlling each intelligent power capacitor to be put into or cut off according to the comparison result. The control system takes network side reactive power as a medium, realizes the coordination work of each intelligent power capacitor and SVG, and does not need bus connection between each intelligent power capacitor and SVG, the effectiveness of a control strategy can be effectively ensured by the wireless connection mode, and meanwhile, the control system can respond to the rapid change of the load in time, so that the running reliability of the system is improved.

Description

SVG and capacitor hybrid compensation control system and method
Technical Field
The invention relates to the technical field of power electronics, in particular to a control system and a control method for SVG and capacitor hybrid compensation.
Background
In the related art, a hybrid reactive compensation device of SVG (Static Var Generator ) and an intelligent capacitor is widely used. For reactive power with large capacity and slow change, an intelligent capacitor is used for compensation, and reactive power with small capacity and capacity which is not complemented is compensated by SVG. Under the operation architecture, the SVG and the intelligent capacitor are communicated and coordinated through communication so as to achieve the purpose of operation of the device. For example, when a CT (Current Transformer ) is installed on the network side, it is currently common practice that the intelligent capacitor obtains the reactive power compensated by each SVG through RS485, and adds up the reactive power with the network side to be used as a control parameter of the intelligent capacitor. The control mode utilizing mutual coordination of communication has one more fault point, and in case of poor communication contact and other problems, the control strategy is easy to fail. Secondly, the response speed is slow, the baud rate of the current common RS485 communication mode generally adopts 9600bps, the quick change of the load cannot be responded in time, and the running reliability of the system is reduced.
Disclosure of Invention
The invention aims to provide a control system and a control method for SVG and capacitor hybrid compensation, so as to ensure the effectiveness of a control strategy, respond to rapid load change in time and improve the running reliability of a system.
The invention provides a control system for SVG and capacitor hybrid compensation, which comprises: a power grid, a load, SVG and a plurality of intelligent power capacitors which are respectively connected with the power grid; the SVG is used for starting operation when detecting that a load starts to operate, and outputting reactive power proportional to the reactive power of the current network side; and the plurality of intelligent power capacitors are used for comparing the reactive power of the current network side with the capacitance compensation level difference after the SVG starts to operate, so as to obtain a comparison result, and controlling each intelligent power capacitor to be put into or cut off according to the comparison result.
Further, the plurality of intelligent power capacitors are also for: if the comparison result indicates that the reactive power of the current network side is larger than the capacitance compensation level difference, and the reactive power of the load is inductive reactive power, putting into an intelligent power capacitor corresponding to the capacitance value of the level difference; and collecting new network side reactive power after the specified intelligent power capacitor is put into, taking the new network side reactive power as new current network side reactive power, and repeatedly executing the step of comparing the current network side reactive power with the capacitance compensation level difference until the current network side reactive power is smaller than the capacitance compensation level difference.
Further, the plurality of intelligent power capacitors are also for: if the reactive power of the load is converted from inductive reactive power to capacitive reactive power, and the comparison result indicates that the reactive power of the current network side is larger than the capacitance compensation level difference, a designated intelligent power capacitor corresponding to the capacitance value of one level difference is cut off; and collecting the new network side reactive power after the specified intelligent power capacitor is cut off, taking the new network side reactive power as the new current network side reactive power, and repeatedly executing the step of comparing the current network side reactive power with the capacitance compensation level difference until the current network side reactive power is smaller than the capacitance compensation level difference.
Further, the network side reactive current of the control system is positively correlated with the load side reactive current.
Further, the number of SVGs is plural.
Further, the total reactive power of the network side of the control system is the sum of the reactive power of the current network side and the adjustment factor; wherein the adjustment factor is determined based on the active power of the load, the power factor control threshold of the SVG, and the power factor control threshold of each intelligent power capacitor.
Further, the power factor control threshold of the SVG and the power factor control threshold of each intelligent power capacitor are both 1.
The invention provides a control method for SVG and capacitor hybrid compensation, which comprises the following steps: when the SVG detects that a load starts to operate, starting to operate, and outputting reactive power proportional to the reactive power of the current network side; after the SVG starts to operate, the plurality of intelligent power capacitors are compared with the current reactive power at the network side and the capacitance compensation level difference to obtain a comparison result, and each intelligent power capacitor is controlled to be put into or cut off according to the comparison result.
Further, the step of controlling to put in or cut out each intelligent power capacitor according to the comparison result includes: if the comparison result indicates that the reactive power of the current network side is larger than the capacitance compensation level difference, and the reactive power of the load is inductive reactive power, putting into a specified intelligent power capacitor corresponding to the capacitance value of the level difference; and collecting new network side reactive power after the specified intelligent power capacitor is put into, taking the new network side reactive power as new current network side reactive power, and repeatedly executing the step of comparing the current network side reactive power with the capacitance compensation level difference until the current network side reactive power is smaller than the capacitance compensation level difference.
Further, the step of controlling to put in or cut out each intelligent power capacitor according to the comparison result includes: if the reactive power of the load is converted from inductive reactive power to capacitive reactive power, and the comparison result indicates that the reactive power of the current network side is larger than the capacitance compensation level difference, a designated intelligent power capacitor corresponding to the capacitance value of one level difference is cut off; and collecting the new network side reactive power after the specified intelligent power capacitor is cut off, taking the new network side reactive power as the new current network side reactive power, and repeatedly executing the step of comparing the current network side reactive power with the capacitance compensation level difference until the current network side reactive power is smaller than the capacitance compensation level difference.
The invention provides a control system and a method for SVG and capacitor hybrid compensation, comprising the following steps: a power grid, a load, SVG and a plurality of intelligent power capacitors which are respectively connected with the power grid; the SVG is used for starting operation when detecting that a load starts to operate, and outputting reactive power proportional to the reactive power of the current network side; and the plurality of intelligent power capacitors are used for comparing the reactive power of the current network side with the capacitance compensation level difference after the SVG starts to operate, so as to obtain a comparison result, and controlling each intelligent power capacitor to be put into or cut off according to the comparison result. The control system takes network side reactive power as a medium, realizes the coordination work of each intelligent power capacitor and SVG, and does not need bus connection between each intelligent power capacitor and SVG, the effectiveness of a control strategy can be effectively ensured by the wireless connection mode, and meanwhile, the control system can respond to the rapid change of the load in time, so that the running reliability of the system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a control system for hybrid reactive compensation of SVG and intelligent capacitor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a control system for SVG and capacitor hybrid compensation according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method for SVG and capacitor hybrid compensation according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
At present, the intelligent capacitor is a common intelligent reactive compensation device at present, has low cost and great advantages in high-capacity reactive compensation, but can only carry out graded compensation. SVG is a new generation reactive power compensation device, which has fast regulation speed and wide operation range, and can restrain harmonic wave in compensation current. However, the high-capacity SVG has a complex structure, high control difficulty and high cost. Due to the limitation of a single reactive power compensation device, the mixed reactive power compensation device of SVG and intelligent capacitor is widely used, as shown in a schematic diagram of a control system of mixed reactive power compensation of SVG and intelligent capacitor in FIG. 1, and the intelligent capacitor obtains reactive power compensated by each SVG through RS 485. Once the intelligent capacitor is put into operation, the actual compensation capacity of the SVG is correspondingly reduced, so that the purpose that the intelligent capacitor compensates the large-capacity reactive power and the SVG compensates the small-capacity reactive power is realized, however, the control mode of mutually coordinating communication is adopted, one more fault point is provided, and the control strategy is easy to lose efficacy. Secondly, the response speed is slow, and the rapid change of the load cannot be responded in time. Based on the above, the embodiment of the invention provides a control system and a control method for SVG and capacitor hybrid compensation, and the technology can be applied to an application scene requiring reactive compensation.
For the understanding of this embodiment, first, a control system for SVG and capacitor hybrid compensation disclosed in this embodiment of the present invention is described, as shown in fig. 2, including: a power grid, a load, SVG and a plurality of intelligent power capacitors which are respectively connected with the power grid; the SVG is used for starting operation when detecting that a load starts to operate, and outputting reactive power proportional to the reactive power of the current network side; and the plurality of intelligent power capacitors are used for comparing the reactive power of the current network side with the capacitance compensation level difference after the SVG starts to operate, so as to obtain a comparison result, and controlling each intelligent power capacitor to be put into or cut off according to the comparison result.
The load may be an inductive load or a capacitive load, etc.; the SVG described above typically employs semiconductor devices and electronic control techniques to compensate for reactive power by adjusting the phase and amplitude of the current. The number of the intelligent power capacitors can be set according to actual demands, each intelligent power capacitor is internally provided with a corresponding controller, and after the intelligent power capacitors are self-networked, the intelligent power capacitors are usually corresponding to the same controller, namely, the control of the input or the removal of the intelligent power capacitors can be realized through one controller; the capacity ratio of the plurality of intelligent power capacitors may be: 1:1: …:1;1:2:2: …:2;1:2:4:4: …:4;1:2:4:8: …:8, etc. The minimum capacity of the intelligent power capacitor can be defined as 1 level difference, and the level difference corresponds to the capacitance compensation level difference. When the state of the load changes in actual implementation, for example, when the load connected to a power grid starts to operate, the SVG can automatically start to operate, collect the reactive power of the current network side and output the reactive power proportional to the reactive power of the current network side; and the intelligent power capacitors are used for comparing the current network side reactive power with the capacitance compensation level difference obtained in advance after the SVG starts to operate, and controlling the investment or the cutting of the intelligent power capacitors according to the comparison result so as to realize the hybrid reactive power compensation of the intelligent power capacitors and the SVG.
The control system for mixing compensation of SVG and capacitor comprises: a power grid, a load, SVG and a plurality of intelligent power capacitors which are respectively connected with the power grid; the SVG is used for starting operation when detecting that a load starts to operate, and outputting reactive power proportional to the reactive power of the current network side; and the plurality of intelligent power capacitors are used for comparing the reactive power of the current network side with the capacitance compensation level difference after the SVG starts to operate, so as to obtain a comparison result, and controlling each intelligent power capacitor to be put into or cut off according to the comparison result. The control system takes network side reactive power as a medium, realizes the coordination work of each intelligent power capacitor and SVG, and does not need bus connection between each intelligent power capacitor and SVG, the effectiveness of a control strategy can be effectively ensured by the wireless connection mode, and meanwhile, the control system can respond to the rapid change of the load in time, so that the running reliability of the system is improved.
And SVG and intelligent power capacitor respectively gather current net side reactive power, independently execute control strategy, control SVG output corresponding reactive power to and each intelligent power capacitor's input, excision state, so that net side reactive power accords with the requirement of predetermineeing.
Further, the plurality of intelligent power capacitors are also for: if the comparison result indicates that the reactive power of the current network side is larger than the capacitance compensation level difference, and the reactive power of the load is inductive reactive power, putting into a specified intelligent power capacitor corresponding to the capacitance value of the level difference; and collecting new network side reactive power after the specified intelligent power capacitor is put into, taking the new network side reactive power as new current network side reactive power, and repeatedly executing the step of comparing the current network side reactive power with the capacitance compensation level difference until the current network side reactive power is smaller than the capacitance compensation level difference.
In actual implementation, the control target current of SVG:；
as can be seen in conjunction with figure 2,thereby obtaining: />；
Wherein I is svg_q Representing the reactive current on the SVG side; k is a preset coefficient; i s_q Representing the network side reactive current; i L_q Representing the load side reactive current.
Assuming that the reactive power of the load is inductive reactive power, the inductive reactive power is represented by Q, when the load starts to operate, the SVG automatically acts and starts to operate, and the reactive power at the current network side isThe SVG may output reactive power proportional to the current network side reactive power; if a plurality of intelligent power capacitors confirm +.>When the capacitance compensation level difference is larger than the capacitance compensation level difference, a specified intelligent power capacitor corresponding to the capacitance value of the level difference is put in, and the reactive power flowing into the SVG becomes +.>Wherein->A capacitance value representing a level difference; the reactive power at the current network side becomes +.>Repeating the step of comparing the magnitude of the reactive power and the capacitance compensation level difference at the current network side until +.>The SVG and the intelligent power capacitor are coordinated and matched, and the state operation is kept.
Further, the plurality of intelligent power capacitors are also for: if the reactive power of the load is converted from inductive reactive power to capacitive reactive power, and the comparison result indicates that the reactive power of the current network side is larger than the capacitance compensation level difference, an intelligent power capacitor corresponding to the capacitance value of one level difference is cut off; and collecting the new network side reactive power after the specified intelligent power capacitor is cut off, taking the new network side reactive power as the new current network side reactive power, and repeatedly executing the step of comparing the current network side reactive power with the capacitance compensation level difference until the current network side reactive power is smaller than the capacitance compensation level difference.
If the load changes, the inductive reactive power of the load is greatly reduced, so that when the reactive power flowing into the SVG is capacitive, i.e. the reactive power of the load is capacitive reactive power, the capacitive reactive power is represented by-Q, the reactive power at the current network side isIf->When the capacitance compensation level difference is larger than the capacitance compensation level difference, the appointed intelligent power capacitor corresponding to the capacitance value of one level difference is cut off, and the reactive power flowing into the SVG becomes +.>The reactive power at the current network side becomes +.>Repeating the step of comparing the magnitude of the reactive power and the capacitance compensation level difference at the current network side until +.>And the difference is smaller than the capacitance compensation level difference, so that the coordination and matching of the SVG and the intelligent power capacitor can be considered to be completed, and the state operation can be kept.
Further, the network side reactive current of the control system is positively correlated with the load side reactive current.
Above-mentionedThe k value of (a) can be as requiredSetting, for example, k is 5, 10, etc.; it can be seen that I L_q The larger I s_q Also the larger I L_q The smaller I s_q The smaller, i.e. I L_q And I s_q Positive correlation. It will be appreciated that the manner of compensation of the SVG may reduce the reactive power without changing the direction of the reactive power. If the compensation is over-compensated before the compensation, the compensation is still over-compensated after the compensation; under-compensation is performed before compensation, and under-compensation is still performed after compensation, but reactive power flowing into a power grid is greatly reduced.
Further, the number of SVGs is plural.
In this embodiment, the number of SVGs may be set as required, and if there are a plurality of SVGs, the control target current of the SVG may achieve natural current sharing among a plurality of SVGs.
Further, the total reactive power of the network side of the control system is the sum of the reactive power of the current network side and the adjustment factor; wherein the adjustment factor is determined based on the active power of the load, the power factor control threshold of the SVG, and the power factor control threshold of each intelligent power capacitor.
The power factor control threshold of the SVG and the power factor control threshold of each intelligent power capacitor are generally the same value, and can be understood as a target power factor of the network side, which means that the power factor of the network side is finally controlled to the power factor control threshold; if the power factor control threshold of each intelligent power capacitor and the power factor control threshold of SVG are set to pf, the power factor of the network side is finally controlled to pf; assuming that the inductive reactive power of the load is Q and the active power is P, the adjustment factor isWhen the load starts to operate, the total reactive power of the network side isWherein->Reactive power at the current network side; if->When the capacitance compensation level difference is larger than the capacitance compensation level difference, after a specified capacitor corresponding to the capacitance value of one level difference is put in, the reactive power flowing into the SVG becomes +.>The net side total reactive power becomes。
Likewise, when the reactive power of the load becomes the capacitive reactive power, the total reactive power at the network side isIf->When the capacitance compensation level difference is larger than the capacitance compensation level difference, after a designated capacitor corresponding to the capacitance value of one level difference is cut off, the reactive power flowing into the SVG becomes +.>The net side total reactive power becomes +.>。
The adjustment factor is mainly used to indicate a target power factor to which it is desired to control the power factor of the network side, and the whole control flow is not affected. Therefore, in one scenario, the power factor control threshold of the SVG and the power factor control threshold of each intelligent power capacitor may be set to 1, at this time, the adjustment factor part is 0, and the total reactive power of the network side of the control system is the reactive power of the current network side, which does not affect the whole control flow.
From the implementation point of view, the implementation process is substantially consistent regardless of whether the reactive power of the load is inductive reactive power Q or capacitive reactive power-Q. The separate description is mainly for respectively explaining two processes of intelligent power capacitor input and cut-off.
According to the SVG and capacitor hybrid compensation control system, network side reactive power is used as a medium, coordination work of SVG and a plurality of intelligent power capacitors is achieved, and the SVG and the intelligent power capacitors are in wireless connection, so that construction quantity is reduced, response speed can be greatly improved, and reliability of system operation is improved.
The invention provides a control method for SVG and capacitor mixed compensation, as shown in figure 3, the method comprises the following steps:
step S302, when the SVG detects that a load starts to operate, starting to operate, and outputting reactive power proportional to the reactive power of the current network side;
and step S304, after the SVG starts to operate, the plurality of intelligent power capacitors are compared with the current reactive power at the network side and the capacitance compensation level difference to obtain a comparison result, and each intelligent power capacitor is controlled to be input or cut off according to the comparison result.
According to the control method for the SVG and capacitor hybrid compensation, when the SVG detects that a load starts to operate, the SVG starts to operate, and reactive power proportional to the reactive power of the current network side is output; after the SVG starts to operate, the plurality of intelligent power capacitors are compared with the current reactive power at the network side and the capacitance compensation level difference to obtain a comparison result, and each intelligent power capacitor is controlled to be put into or cut off according to the comparison result. The control system takes network side reactive power as a medium, realizes the coordination work of each intelligent power capacitor and SVG, and does not need bus connection between each intelligent power capacitor and SVG, the effectiveness of a control strategy can be effectively ensured by the wireless connection mode, and meanwhile, the control system can respond to the rapid change of the load in time, so that the running reliability of the system is improved.
Further, the step of controlling to put in or cut out each intelligent power capacitor according to the comparison result includes: if the comparison result indicates that the reactive power of the current network side is larger than the capacitance compensation level difference, and the reactive power of the load is inductive reactive power, putting into a specified intelligent power capacitor corresponding to the capacitance value of the level difference; and collecting new network side reactive power after the specified intelligent power capacitor is put into, taking the new network side reactive power as new current network side reactive power, and repeatedly executing the step of comparing the current network side reactive power with the capacitance compensation level difference until the current network side reactive power is smaller than the capacitance compensation level difference.
Further, the step of controlling to put in or cut out each intelligent power capacitor according to the comparison result includes: if the reactive power of the load is converted from inductive reactive power to capacitive reactive power, and the comparison result indicates that the reactive power of the current network side is larger than the capacitance compensation level difference, a designated intelligent power capacitor corresponding to the capacitance value of one level difference is cut off; and collecting the new network side reactive power after the specified intelligent power capacitor is cut off, taking the new network side reactive power as the new current network side reactive power, and repeatedly executing the step of comparing the current network side reactive power with the capacitance compensation level difference until the current network side reactive power is smaller than the capacitance compensation level difference.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (10)

1. A control system for SVG and capacitor hybrid compensation, comprising: a power grid, and a load, an SVG, and a plurality of intelligent power capacitors connected to the power grid, respectively;
the SVG is used for starting operation when detecting that the load starts to operate, and outputting reactive power proportional to the reactive power of the current network side;
the intelligent power capacitors are used for comparing the reactive power of the current network side with the capacitance compensation level difference after the SVG starts to operate, so as to obtain a comparison result, and controlling each intelligent power capacitor to be put into or cut off according to the comparison result; wherein the capacitance compensation step is a minimum capacity of the intelligent power capacitor.
2. The control system of claim 1, wherein a plurality of the intelligent power capacitors are further configured to:
if the comparison result indicates that the reactive power of the current network side is larger than the capacitance compensation level difference, and the reactive power of the load is inductive reactive power, putting into a specified intelligent power capacitor corresponding to the capacitance value of one level difference;
and collecting new network side reactive power after the specified intelligent power capacitor is put into, taking the new network side reactive power as new current network side reactive power, and repeatedly executing the step of comparing the current network side reactive power with the capacitance compensation level difference until the current network side reactive power is smaller than the capacitance compensation level difference.
3. The control system of claim 2, wherein a plurality of the intelligent power capacitors are further configured to:
if the reactive power of the load is converted from the inductive reactive power to the capacitive reactive power, and the comparison result indicates that the reactive power of the current network side is larger than the capacitance compensation level difference, a designated intelligent power capacitor corresponding to the capacitance value of one level difference is cut off;
and collecting new network side reactive power after the appointed intelligent power capacitor is cut off, taking the new network side reactive power as new current network side reactive power, and repeatedly executing the step of comparing the current network side reactive power with the capacitance compensation level difference until the current network side reactive power is smaller than the capacitance compensation level difference.
4. The control system of claim 1, wherein the grid-side reactive current of the control system is positively correlated with the load-side reactive current.
5. The control system of claim 1, wherein the number of SVGs is a plurality.
6. The control system of claim 1, wherein a net side total reactive power of the control system is a sum of the current net side reactive power and an adjustment factor; wherein the adjustment factor is determined based on the active power of the load, the power factor control threshold of the SVG, and the power factor control threshold of each of the intelligent power capacitors.
7. The control system of claim 6, wherein the power factor control threshold of the SVG and the power factor control threshold of each of the intelligent power capacitors are each 1.
8. A control method for SVG and capacitor hybrid compensation, the method comprising:
when the SVG detects that a load starts to operate, starting to operate, and outputting reactive power proportional to the reactive power of the current network side;
after the SVG starts to operate, the magnitude of reactive power and capacitance compensation level difference of the current network side are compared to obtain a comparison result, and each intelligent power capacitor is controlled to be put into or cut off according to the comparison result; wherein the capacitance compensation step is a minimum capacity of the intelligent power capacitor.
9. The method of claim 8, wherein controlling the switching in or out of each of the intelligent power capacitors based on the comparison result comprises:
if the comparison result indicates that the reactive power of the current network side is larger than the capacitance compensation level difference, and the reactive power of the load is inductive reactive power, putting into a specified intelligent power capacitor corresponding to the capacitance value of one level difference;
and collecting new network side reactive power after the specified intelligent power capacitor is put into, taking the new network side reactive power as new current network side reactive power, and repeatedly executing the step of comparing the current network side reactive power with the capacitance compensation level difference until the current network side reactive power is smaller than the capacitance compensation level difference.
10. The method of claim 9, wherein controlling the switching in or out of each of the intelligent power capacitors based on the comparison result comprises:
if the reactive power of the load is converted from the inductive reactive power to the capacitive reactive power, and the comparison result indicates that the reactive power of the current network side is larger than the capacitance compensation level difference, a designated intelligent power capacitor corresponding to the capacitance value of one level difference is cut off;
and collecting new network side reactive power after the appointed intelligent power capacitor is cut off, taking the new network side reactive power as new current network side reactive power, and repeatedly executing the step of comparing the current network side reactive power with the capacitance compensation level difference until the current network side reactive power is smaller than the capacitance compensation level difference.
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Citations (8)

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