CN115800305A - Combined type high-voltage reactive power compensation method and system - Google Patents

Combined type high-voltage reactive power compensation method and system Download PDF

Info

Publication number
CN115800305A
CN115800305A CN202310051369.4A CN202310051369A CN115800305A CN 115800305 A CN115800305 A CN 115800305A CN 202310051369 A CN202310051369 A CN 202310051369A CN 115800305 A CN115800305 A CN 115800305A
Authority
CN
China
Prior art keywords
compensation
reactive power
power compensation
distribution system
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202310051369.4A
Other languages
Chinese (zh)
Other versions
CN115800305B (en
Inventor
秦玲
宋国伟
李新娟
王建光
李姗姗
孙海龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongfang Power Beijing Technology Co ltd
Original Assignee
Dongfang Power Beijing Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongfang Power Beijing Technology Co ltd filed Critical Dongfang Power Beijing Technology Co ltd
Priority to CN202310051369.4A priority Critical patent/CN115800305B/en
Publication of CN115800305A publication Critical patent/CN115800305A/en
Application granted granted Critical
Publication of CN115800305B publication Critical patent/CN115800305B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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]
    • 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
    • Y02E40/40—Arrangements for reducing harmonics

Abstract

The application provides a combined high-voltage reactive power compensation method and a system, wherein a compensation device controller judges whether the current reactive power compensation demand of a user power distribution system exceeds the minimum switching compensation capacity of a high-voltage filtering and reactive power compensation device; if the reactive power compensation demand does not exceed the minimum switching compensation capacity, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device and the booster transformer to perform reactive power compensation on the user power distribution system; and if the reactive power compensation demand exceeds the minimum switching compensation capacity, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device, the step-up transformer and the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system. By adopting the method, the efficiency and the effect of performing reactive power compensation on the power distribution system are improved.

Description

Combined type high-voltage reactive power compensation method and system
Technical Field
The invention relates to the technical field of power supply of a power grid, in particular to a combined high-voltage reactive power compensation method and system.
Background
In a user power distribution network, because a large number of inductive loads such as motors, transformers, reactors, fluorescent lamps and the like exist, the loads need a large amount of capacitive reactive power to compensate, and if the reactive power needed by the loads is supplied by the transformers, the capacity of the transformers for outputting active power is reduced on the premise that the output power of the transformers is not changed, and precious transformer active capacity is occupied. In order to reduce active losses and voltage drops, and to reduce losses in the power transmission, to make the grid operate more safely, economically and efficiently, and to improve the capacity and quality of the power transmission, local reactive power compensation or regulation is usually performed.
The existing reactive compensation devices are mainly divided into two types of passive compensation and active compensation, wherein the active compensation takes a Static Var Generator (SVG) as a mainstream compensation device and adopts the principle of a power inverter, but the application cost is high and the reliability is poor; the passive compensation device takes an FC fixed compensation and a Static Var Compensator (SVC) as a mainstream compensation device, wherein a capacitor is a main compensation power device, and the passive compensation device has the advantages of low cost, simple control method and mature technology, but the high-voltage FC uses a vacuum contactor to switch the capacitor, so that the switching impact is large, the compensation precision is low, and the passive compensation device is not suitable for working conditions with frequently changed loads.
In addition, the inventor also finds that in the research, the optimal filter parameters of the FC need to be determined for the SVC system (namely, a TCR + FC type system), and the design of the FC filter network not only needs to consider the system harmonic wave, but also needs to consider the harmonic current generated by the TCR, so that the error generated in the acquisition of the TCR harmonic current easily affects the normal and effective power compensation of the SVC system, thereby reducing the efficiency of performing reactive power compensation on the power distribution system; the SVG + FC hybrid reactive power compensation system is a compensation device based on a voltage type PWM converter, a large amount of high-order harmonic waves can be generated to pollute a power grid, and the polluted power grid is at the cost of sacrificing the quality of electric energy, so that the efficiency and the effect of reactive power compensation on a power distribution system are reduced.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for composite high-voltage reactive power compensation to improve the efficiency and effect of reactive power compensation for a power distribution system.
In a first aspect, an embodiment of the present application provides a composite high-voltage reactive power compensation method, which is applied to a composite high-voltage reactive power compensation system, where the composite high-voltage reactive power compensation system includes a compensation device controller, a high-voltage filtering and reactive power compensation device, a low-voltage dynamic reactive power compensation TSC device, and a step-up transformer, and the method includes:
the compensation device controller judges whether the current reactive power compensation demand of a user power distribution system exceeds the minimum switching compensation capacity of the high-voltage filtering and reactive compensation device, wherein the minimum switching compensation capacity is the minimum operation capacity of switching action of the high-voltage filtering and reactive compensation device;
if the reactive power compensation demand does not exceed the minimum switching compensation capacity, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device and the step-up transformer to perform reactive power compensation on the user power distribution system;
and if the reactive power compensation demand exceeds the minimum switching compensation capacity, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device, the step-up transformer and the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system.
Optionally, the compensating device controller controls the low-voltage dynamic reactive power compensation TSC device and the step-up transformer to perform reactive power compensation on the user power distribution system, including:
the compensation device controller judges the change condition of the reactive power compensation demand of the user power distribution system in real time;
and the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to adjust an input compensation capacitor bank according to the change condition of the reactive power compensation demand of the user power distribution system, and the user power distribution system is subjected to reactive power compensation through the step-up transformer.
Optionally, the controlling, by the compensation device controller, the capacitor bank put into the low-voltage dynamic reactive power compensation TSC device according to a change of a reactive power compensation demand of the user power distribution system, and performing reactive power compensation on the user power distribution system through the step-up transformer includes:
when the reactive power compensation demand of the user power distribution system is increased to meet a preset first input condition, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to increase an input compensation capacitor bank, and reactive power compensation is carried out on the user power distribution system through the booster transformer;
when the reactive power compensation demand of the user power distribution system fluctuates within a preset return difference range, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to keep an input compensation capacitor bank and perform reactive power compensation on the user power distribution system through the step-up transformer;
when the reactive power compensation demand of the user power distribution system is reduced to a preset first removal condition or when the reactive power of the user power distribution system is excessively compensated, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to remove an added compensation capacitor bank and perform reactive power compensation on the user power distribution system through the boosting transformer.
Optionally, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device, the step-up transformer, and the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system, where the compensation device controller includes:
the compensation device controller judges the change condition of the reactive power compensation demand of the user power distribution system in real time;
and the compensation device controller controls a compensation capacitor group which is adjusted and input by the low-voltage dynamic reactive power compensation TSC device according to the change condition of the reactive power compensation demand of the user power distribution system, performs reactive power compensation on the user power distribution system through the step-up transformer, and then controls a compensation capacitor group which is adjusted and input by the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system.
Optionally, the controlling, by the compensation device controller, a compensation capacitor bank that is put into the low-voltage dynamic reactive power compensation TSC device according to a change of a reactive power compensation demand of the user power distribution system, and performs reactive power compensation on the user power distribution system through the step-up transformer, and then controls a compensation capacitor bank that is put into the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system, where the controlling includes:
when the reactive power compensation demand of the user power distribution system is increased to meet a preset second input condition, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to be input into a first target capacitor bank, reactive power compensation is carried out on the user power distribution system through the booster transformer, then after a preset time, the high-voltage filter and reactive power compensation device is controlled to be input into a second target capacitor bank to carry out reactive power compensation on the user power distribution system, meanwhile, the low-voltage dynamic reactive power compensation TSC device is controlled to cut off the input first target capacitor bank, so that reactive power compensation carried out on the user power distribution system by using the low-voltage dynamic reactive power compensation TSC device is converted into reactive power compensation carried out on the user power distribution system by using a high-voltage filter and reactive power compensation device, wherein the capacity of the first target capacitor bank is the same as the capacity of the second target capacitor bank;
when the reactive power compensation demand of the user power distribution system fluctuates within a preset return difference range, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to keep an input capacitor bank, reactive power compensation is carried out on the user power distribution system through the boosting transformer, and the high-voltage filtering and reactive power compensation device is controlled to keep the input capacitor bank to carry out reactive power compensation on the user power distribution system;
when the reactive power compensation demand of the user power distribution system is reduced to a preset second removal condition or when the reactive power of the user power distribution system is excessively compensated, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to remove a third target capacitor bank, reactive power compensation is performed on the user power distribution system through the step-up transformer, then the high-voltage filtering and reactive power compensation device is controlled to remove a fourth target capacitor bank after a preset time period, meanwhile, the low-voltage dynamic reactive power compensation TSC device is controlled to be put into the third target capacitor bank to perform reactive power compensation on the user power distribution system, reactive power compensation performed on the user power distribution system by using the low-voltage dynamic reactive power compensation TSC device is converted into reactive power compensation performed on the user power distribution system by using the high-voltage filtering and reactive power compensation device, wherein the capacity of the third target capacitor bank is the same as the capacity of the fourth target capacitor bank.
In a second aspect, an embodiment of the present application provides a composite high-voltage reactive power compensation system, where the system includes a compensation device controller, a high-voltage filtering and reactive power compensation device, a low-voltage dynamic reactive power compensation TSC device, and a step-up transformer;
the compensation device controller is used for judging whether the current reactive power compensation demand of a user power distribution system exceeds the minimum switching compensation capacity of the high-voltage filtering and reactive compensation device, wherein the minimum switching compensation capacity is the minimum operation capacity of switching action of the high-voltage filtering and reactive compensation device;
if the reactive power compensation demand does not exceed the minimum switching compensation capacity, the compensation device controller is used for controlling the low-voltage dynamic reactive power compensation TSC device and the step-up transformer to perform reactive power compensation on the user power distribution system;
and if the reactive power compensation demand exceeds the minimum switching compensation capacity, the compensation device controller is used for controlling the low-voltage dynamic reactive power compensation TSC device, the booster transformer and the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system.
Optionally, when the compensation device controller is configured to control the low-voltage dynamic reactive power compensation TSC device and the step-up transformer to perform reactive power compensation on the user power distribution system, the compensation device controller is specifically configured to:
judging the change condition of the reactive power compensation demand of the user power distribution system in real time;
and controlling the low-voltage dynamic reactive power compensation TSC device to adjust an input compensation capacitor bank according to the change condition of the reactive power compensation demand of the user power distribution system, and performing reactive power compensation on the user power distribution system through the step-up transformer.
Optionally, the compensation device controller is configured to control the low-voltage dynamic reactive power compensation TSC device to adjust an input capacitor bank according to a change of a reactive power compensation demand of the user power distribution system, and when performing reactive power compensation on the user power distribution system through the step-up transformer, the compensation device controller is specifically configured to:
when the reactive power compensation demand of the user power distribution system is increased to meet a preset first input condition, controlling the low-voltage dynamic reactive power compensation TSC device to increase an input compensation capacitor bank, and performing reactive power compensation on the user power distribution system through the boosting transformer;
when the reactive power compensation demand of the user power distribution system is fluctuated within a preset return difference range, controlling the low-voltage dynamic reactive power compensation TSC device to keep an input compensation capacitor bank, and performing reactive power compensation on the user power distribution system through the step-up transformer;
when the reactive power compensation demand of the user power distribution system is reduced to a preset first removal condition or when the reactive power of the user power distribution system is excessively compensated, the low-voltage dynamic reactive power compensation TSC device is controlled to remove an input compensation capacitor bank and perform reactive power compensation on the user power distribution system through the boosting transformer.
Optionally, when the compensation device controller is configured to control the low-voltage dynamic reactive power compensation TSC device, the step-up transformer, and the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system, the compensation device controller is specifically configured to:
judging the change condition of the reactive power compensation demand of the user power distribution system in real time;
and controlling a compensation capacitor group of the low-voltage dynamic reactive power compensation TSC device to adjust the input according to the change condition of the reactive power compensation demand of the user power distribution system, performing reactive power compensation on the user power distribution system through the step-up transformer, and then controlling the compensation capacitor group of the high-voltage filtering and reactive power compensation device to adjust the input to perform reactive power compensation on the user power distribution system.
Optionally, the compensation device controller is specifically configured to, when the compensation capacitor bank used for controlling the low-voltage dynamic reactive power compensation TSC device to adjust the input according to a change of a reactive power compensation demand of the user power distribution system, perform reactive power compensation on the user power distribution system through the step-up transformer, and then control the compensation capacitor bank used for controlling the high-voltage filtering and reactive power compensation device to adjust the input to perform reactive power compensation on the user power distribution system:
when the reactive power compensation demand of the user power distribution system is increased to meet a preset second input condition, controlling the low-voltage dynamic reactive power compensation (TSC) device to input a first target capacitor bank, performing reactive power compensation on the user power distribution system through the booster transformer, then controlling the high-voltage filtering and reactive power compensation device to input a second target capacitor bank to perform reactive power compensation on the user power distribution system after a preset time, and simultaneously controlling the low-voltage dynamic reactive power compensation (TSC) device to cut off the input first target capacitor bank so as to convert reactive power compensation performed on the user power distribution system by using the low-voltage dynamic reactive power compensation (TSC) device into reactive power compensation performed on the user power distribution system by using a high-voltage filter and reactive power compensation device, wherein the capacity of the first target capacitor bank is the same as the capacity of the second target capacitor bank;
when the reactive power compensation demand of the user power distribution system is fluctuated within a preset return difference range, controlling the low-voltage dynamic reactive power compensation TSC device to keep an input capacitor bank, performing reactive power compensation on the user power distribution system through the step-up transformer, and controlling the high-voltage filtering and reactive power compensation device to keep the input capacitor bank to perform reactive power compensation on the user power distribution system;
when the reactive power compensation demand of the user power distribution system is reduced to a preset second removal condition or when the reactive power of the user power distribution system is excessively compensated, controlling the low-voltage dynamic reactive power compensation TSC device to remove a third target capacitor bank, performing reactive power compensation on the user power distribution system through the boosting transformer, then controlling the high-voltage filtering and reactive power compensation device to remove a fourth target capacitor bank after a preset time, and simultaneously controlling the low-voltage dynamic reactive power compensation TSC device to be put into the third target capacitor bank to perform reactive power compensation on the user power distribution system so as to convert the reactive power compensation performed on the user power distribution system by using the low-voltage dynamic reactive power compensation TSC device into the reactive power compensation performed on the user power distribution system by using the high-voltage filtering and reactive power compensation device, wherein the capacity of the third target capacitor bank is the same as the capacity of the fourth target capacitor bank.
The technical scheme provided by the application comprises but is not limited to the following beneficial effects:
the compensation device controller judges whether the current reactive power compensation demand of a user power distribution system exceeds the minimum switching compensation capacity of the high-voltage filtering and reactive compensation device, wherein the minimum switching compensation capacity is the minimum operation capacity of switching action of the high-voltage filtering and reactive compensation device; if the reactive power compensation demand does not exceed the minimum switching compensation capacity, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device and the step-up transformer to perform reactive power compensation on the user power distribution system; if the reactive power compensation demand exceeds the minimum switching compensation capacity, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device, the booster transformer and the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system; through the steps, the low-voltage dynamic reactive power compensation TSC device and the high-voltage filtering and reactive power compensation device can be determined to act independently or together in a switching manner according to the comparison result of the compensation demand of the user power distribution system for reactive power and the minimum switching compensation capacity of the high-voltage filtering and reactive power compensation device.
By adopting the method, different compensation devices are distributed to the power distribution system in different states for carrying out reactive power compensation by acquiring and comparing the reactive power compensation demand of the power distribution system of a user, and the compensation devices which are adaptive to the power distribution system in different states are pertinently selected for carrying out reactive power compensation on the power distribution system due to different compensation characteristics of the different compensation devices, so that the efficiency of carrying out reactive power compensation on the power distribution system can be improved, and meanwhile, due to different response speeds of the different compensation devices, when the compensation device with higher response speed is used for carrying out reactive power compensation on the system, the speed and the effect of carrying out reactive power compensation on the power distribution system can be improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a flowchart of a hybrid high-voltage reactive power compensation method according to a first embodiment of the present invention;
fig. 2 is a flow chart of a second hybrid high-voltage reactive power compensation method according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a third hybrid high-voltage reactive power compensation method according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a fourth hybrid high-voltage reactive power compensation method according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a fifth hybrid high-voltage reactive power compensation method according to an embodiment of the present invention;
fig. 6 shows a schematic structural diagram of a specific composite high-voltage reactive power compensation system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Example one
For the convenience of understanding of the present application, the first embodiment of the present application will be described in detail below with reference to the content described in the flowchart of the first embodiment of the present invention shown in fig. 1.
Referring to fig. 1, fig. 1 shows a flowchart of a combined high-voltage reactive power compensation method provided in an embodiment of the present invention, where the method is applied to a combined high-voltage reactive power compensation system, where the combined high-voltage reactive power compensation system includes a compensation device controller, a low-voltage dynamic reactive power compensation TSC device, a high-voltage filtering and reactive power compensation device, and a step-up transformer, and the method includes steps S101 to S103:
s101: and the compensation device controller judges whether the current reactive power compensation demand of the user power distribution system exceeds the minimum switching compensation capacity of the high-voltage filtering and reactive compensation device, wherein the minimum switching compensation capacity is the minimum operation capacity of switching action of the high-voltage filtering and reactive compensation device.
Specifically, a user power distribution system is composed of multiple electric equipment (or elements), and the user power distribution system often has reactive fluctuation, so that reactive power compensation needs to be performed on the user power distribution system, namely, the reactive compensation is the rigid requirement of the user power distribution network; the combined high-voltage reactive power compensation system current sampling mutual inductor is generally arranged close to the system side, and the current detected by the combined high-voltage reactive power compensation system current sampling mutual inductor is the system current after compensation. The reactive power compensation demand of the user power distribution system is obtained through related equipment in the user power distribution system, and then whether the reactive power compensation demand of the user power distribution system exceeds the minimum operation capacity of switching actions of the high-voltage filtering and reactive power compensation device or not is judged.
S102: and if the reactive power compensation demand does not exceed the minimum switching compensation capacity, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device and the step-up transformer to perform reactive power compensation on the user power distribution system.
Specifically, if the required reactive power compensation amount does not exceed the minimum switching compensation capacity, it indicates that the condition of performing reactive power compensation on the user power distribution system by using the high-voltage filter-fed reactive power compensation device is not met, so in this case, only the low-voltage dynamic reactive power compensation TSC (thyristor switched capacitor) device and the step-up transformer need to be controlled to perform reactive power compensation on the user power distribution system.
The step-up transformer is used for performing step-up conversion on current output by the low-voltage dynamic reactive power compensation TSC device, the total output power of the step-up transformer is kept unchanged, the step-up transformer generally matches the power of the transformer according to the reactive total compensation capacity of the low-voltage dynamic reactive power compensation TSC device, and the main parameters comprise: voltage ratio, rated power, etc., such as: 500KVA or 630KVA. And then transmitting the capacitive compensation current obtained after the voltage boosting to a user high-voltage distribution system.
When the reactive power compensation is actually carried out, the requirement that the reactive total compensation capacity of the low-voltage dynamic reactive compensation TSC device is not more than the minimum group compensation capacity of the high-voltage filtering and reactive compensation device is met.
S103: and if the reactive power compensation demand exceeds the minimum switching compensation capacity, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device, the step-up transformer and the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system.
Specifically, if the required reactive power compensation amount exceeds the minimum switching compensation capacity, it indicates that the condition of performing reactive power compensation on the user power distribution system by using the high-voltage filtering and reactive power compensation device is met, so that the low-voltage dynamic reactive power compensation TSC device and the high-voltage filtering and reactive power compensation device need to be started simultaneously to perform reactive power compensation on the user power distribution system.
Another advantage of simultaneously starting the low-voltage dynamic reactive power compensation TSC device and the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system is that under the condition that both the low-voltage dynamic reactive power compensation TSC device and the high-voltage filtering and reactive power compensation device can be put into use, the low-voltage dynamic reactive power compensation TSC device firstly acts to put into use to compensate for the system reactive power demand of all or part of the high-voltage filtering and reactive power compensation device which does not reach the preset time. The same is true for the low-voltage dynamic reactive power compensation TSC device and the high-voltage filtering and reactive power compensation device in the cutting process: the low-voltage dynamic reactive power compensation TSC device acts in advance, and the system reactive over-compensation amount of all or part of the high-voltage filtering and reactive power compensation devices which are not in the preset time is cut off.
In one possible embodiment, referring to fig. 2, fig. 2 is a flowchart illustrating a second hybrid high-voltage reactive power compensation method provided by an embodiment of the present invention, wherein the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device and the step-up transformer to perform reactive power compensation on the user power distribution system, and the method includes steps S201 to S202:
s201: and the compensation device controller judges the change condition of the reactive power compensation demand of the user power distribution system in real time.
Specifically, if the reactive power compensation demand does not exceed the minimum switching compensation capacity of the high-voltage filtering and reactive power compensation device, the compensation device controller judges the variation trend of the reactive power compensation demand of the user power distribution system in real time.
The implementation mode further comprises the following steps: the compensation device controller collects voltage and current signals of the high-voltage system in real time, and calculates various power grid parameters including the residual reactive demand of the system, such as the residual reactive demand = actual reactive demand-compensation capacity (compensation capacity already put into the low-voltage dynamic reactive compensation TSC device + compensation capacity already put into the high-voltage filtering and reactive compensation device).
S202: and the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to adjust an input compensation capacitor bank according to the change condition of the reactive power compensation demand of the user power distribution system, and the user power distribution system is subjected to reactive power compensation through the step-up transformer.
Specifically, under the condition of different reactive power compensation demand changes, low-voltage dynamic reactive power compensation TSC devices with compensation capacitor banks of different numbers need to be used, and reactive power compensation is performed on the user power distribution system through the step-up transformer.
In a possible embodiment, referring to fig. 3, fig. 3 shows a flowchart of a third hybrid high-voltage reactive power compensation method provided in an embodiment of the present invention, in which the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to adjust an input capacitor bank according to a change of a reactive power compensation demand of the customer distribution system, and performs reactive power compensation on the customer distribution system through the step-up transformer, including steps S301 to S303:
s301: when the reactive power compensation demand of the user power distribution system is increased to meet a preset first input condition, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to increase an input compensation capacitor bank, and reactive power compensation is carried out on the user power distribution system through the boosting transformer.
Specifically, when the reactive power compensation demand of the user power distribution system increases to meet a preset first input condition, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to increase an input compensation capacitor bank, and performs reactive power compensation on the user power distribution system through the step-up transformer.
S302: when the reactive power compensation demand of the user power distribution system fluctuates within a preset return difference range, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to keep an input compensation capacitor bank, and reactive power compensation is carried out on the user power distribution system through the boosting transformer.
Specifically, when the reactive power compensation demand of the user power distribution system fluctuates within a preset return difference range, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to maintain an already-put compensation capacitor bank, and performs reactive power compensation on the user power distribution system through the step-up transformer.
S303: when the reactive power compensation demand of the user power distribution system is reduced to a preset first removal condition or when the reactive power of the user power distribution system is excessively compensated, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to remove an added compensation capacitor bank and perform reactive power compensation on the user power distribution system through the boosting transformer.
Specifically, when the reactive power compensation demand of the user power distribution system is reduced to meet a first cut-off condition, the first cut-off condition is that the current power factor of the system exceeds a preset power factor, or when the reactive power of the user power distribution system is excessively compensated, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to cut off an input compensation capacitor bank, and reactive power compensation is performed on the user power distribution system through the step-up transformer.
In one possible embodiment, referring to fig. 4, fig. 4 is a flowchart illustrating a fourth hybrid high-voltage reactive power compensation method provided in an embodiment of the present invention, wherein the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device, the step-up transformer, and the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system, and the method includes steps S401 to S402:
s401: and the compensating device controller judges the change condition of the reactive power compensation demand of the user power distribution system in real time.
Specifically, if the reactive power compensation demand exceeds the minimum switching compensation capacity, the change condition of the reactive power compensation demand of the user power distribution system may be determined in real time by referring to the step in step S201.
S402: and the compensation device controller controls a compensation capacitor group which is adjusted and input by the low-voltage dynamic reactive power compensation TSC device according to the change condition of the reactive power compensation demand of the user power distribution system, performs reactive power compensation on the user power distribution system through the step-up transformer, and then controls a compensation capacitor group which is adjusted and input by the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system.
Specifically, under the condition of variation of different reactive power compensation demands, low-voltage dynamic reactive power compensation TSC devices with compensation capacitor banks of different numbers need to be used, reactive power compensation is performed on the user power distribution system through the step-up transformer, and high-voltage filtering and reactive power compensation devices of different capacity banks need to be added together to perform reactive power compensation on the user power distribution system.
In a possible embodiment, referring to fig. 5, fig. 5 shows a flowchart of a fifth hybrid high-voltage reactive power compensation method provided in an embodiment of the present invention, where the compensation device controller controls a compensation capacitor bank of the low-voltage dynamic reactive power compensation TSC device to adjust the input according to a change of a reactive power compensation demand of the customer distribution system, performs reactive power compensation on the customer distribution system through the step-up transformer, and then controls a compensation capacitor bank of the high-voltage filtering and reactive power compensation device to adjust the input to perform reactive power compensation on the customer distribution system, including steps S501 to S503:
s501: when the reactive power compensation demand of the user power distribution system is increased to meet a preset second input condition, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to input a first target capacitor bank, reactive power compensation is carried out on the user power distribution system through the boosting transformer, then after a preset time period, the high-voltage filtering and reactive power compensation device is controlled to input a second target capacitor bank to carry out reactive power compensation on the user power distribution system, meanwhile, the low-voltage dynamic reactive power compensation TSC device is controlled to cut off the input first target capacitor bank, reactive power compensation carried out on the user power distribution system by using the low-voltage dynamic reactive power compensation TSC device is converted into reactive power compensation carried out on the user power distribution system by using a high-voltage filter and reactive power compensation device, wherein the capacity of the first target capacitor bank is the same as the capacity of the second target capacitor bank.
Specifically, when the reactive power compensation demand of the user power distribution system is increased, the control of the compensation device controller is divided into two parts, the first part is to control the low-voltage dynamic reactive power compensation TSC device to be put into a first target capacitor bank, reactive power compensation is performed on the user power distribution system through the step-up transformer, the second part is to control the high-voltage filtering and reactive power compensation device to be put into a second target capacitor bank after a preset time length to perform reactive power compensation on the user power distribution system, and simultaneously control the low-voltage dynamic reactive power compensation TSC device to cut off the put first target capacitor bank.
S502: when the reactive power compensation demand of the user power distribution system is fluctuated within a preset return difference range, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to keep an input capacitor bank, reactive power compensation is carried out on the user power distribution system through the boosting transformer, and the high-voltage filtering and reactive power compensation device is controlled to keep the input capacitor bank to carry out reactive power compensation on the user power distribution system.
Specifically, when the reactive power compensation demand of the user power distribution system fluctuates within a preset return difference range, the control of the compensation device controller is divided into two parts, the first part is to control the low-voltage dynamic reactive power compensation TSC device to keep an already-put capacitor bank, reactive power compensation is performed on the user power distribution system through the step-up transformer, and the second part is to control the high-voltage filtering and reactive power compensation device to keep the already-put capacitor bank to perform reactive power compensation on the user power distribution system.
S503: when the reactive power compensation demand of the user power distribution system is reduced to a preset second removal condition or when the reactive power of the user power distribution system is excessively compensated, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to remove a third target capacitor bank, reactive power compensation is performed on the user power distribution system through the step-up transformer, then the high-voltage filtering and reactive power compensation device is controlled to remove a fourth target capacitor bank after a preset time period, meanwhile, the low-voltage dynamic reactive power compensation TSC device is controlled to be put into the third target capacitor bank to perform reactive power compensation on the user power distribution system, reactive power compensation performed on the user power distribution system by using the low-voltage dynamic reactive power compensation TSC device is converted into reactive power compensation performed on the user power distribution system by using the high-voltage filtering and reactive power compensation device, wherein the capacity of the third target capacitor bank is the same as the capacity of the fourth target capacitor bank.
Specifically, when the reactive power compensation demand of the user power distribution system is reduced or the reactive power of the user power distribution system is excessively compensated, the control of the compensation device controller is divided into two parts, the first part is used for controlling the low-voltage dynamic reactive power compensation TSC device to cut off a third target capacitor bank, reactive power compensation is performed on the user power distribution system through the step-up transformer, the second part is used for controlling the high-voltage filtering and reactive power compensation device to cut off a fourth target capacitor bank after a preset time period, and meanwhile, the low-voltage dynamic reactive power compensation TSC device is controlled to be put into the third target capacitor bank to perform reactive power compensation on the user power distribution system.
That is, in an initial state, the low-voltage dynamic reactive power compensation TSC device originally puts in a designated capacitor bank for reactive power compensation, when the required amount of reactive power compensation of the user power distribution system is reduced or the reactive power of the user power distribution system is over-compensated, the low-voltage dynamic reactive power compensation TSC device cuts off a part of the capacitor bank to reduce the compensation amount, after a preset time, the high-voltage filtering and reactive power compensation device cuts off a part of the capacitor bank, and the low-voltage dynamic reactive power compensation TSC device puts in a part of the capacitor bank cut off before, at this time, the number of the capacitor banks put in compensation by the low-voltage dynamic reactive power compensation TSC device is consistent with that in the initial state and does not change, which indicates that the device does not participate in reactive power compensation for the user power distribution system, and only the number of the capacitor banks put in compensation by the high-voltage filtering and reactive power compensation device changes compared with that in the initial state for reactive power compensation, so that the device switching during reactive power compensation is completed.
In addition, referring to fig. 6, fig. 6 shows a schematic structural diagram of a specific hybrid high-voltage reactive power compensation system according to an embodiment of the present invention, where the specific hybrid high-voltage reactive power compensation system includes a high-voltage side power grid (a user power distribution system), a low-voltage side power grid, a step-up transformer, a low-voltage dynamic reactive power compensation TSC device, a high-voltage fixed compensation FC (fixed reactive power compensation) type filtering and reactive power compensation device (corresponding to the above-mentioned high-voltage filtering and reactive power compensation device), a current transformer, a voltage transformer (not shown), and a load, an output end of the low-voltage dynamic reactive power compensation TSC device is connected to the low-voltage side power grid, an input end of the step-up transformer is connected to the low-voltage side power grid, an output end of the step-up transformer is connected to an output end of the high-voltage fixed compensation FC type filtering and reactive power compensation device, an output end of the high-voltage fixed compensation FC type filtering and reactive power compensation device is connected to the high-voltage side power grid, the current transformer is disposed on the high-voltage side power grid, and the load is connected to the high-voltage side power grid.
Considering the characteristics of the power distribution system of the user: the control system implementation method provided by the application is to design a special controller, and can simultaneously control low-compensation high-speed TSC (equivalent to the low-voltage dynamic reactive power compensation TSC device) compensation and high-voltage fixed capacitor compensation FC (equivalent to the high-voltage filter wave and reactive power compensation device) to perform slow compensation: in the aspect of compensation capacity distribution, the minimum group capacity of the high-voltage filtering and reactive power compensation device (recorded as high-voltage FC) is not less than the partial total capacity of the low-voltage dynamic reactive power compensation TSC device (recorded as low-compensation TSC), so that the reasonable effectiveness of control matching can be ensured. High voltage FC compensation capacity Q FC =Q S ±Q Low benefit height Wherein Q is S Representing the current reactive demand, Q, of the system Low benefit height Indicating a low boost TSC compensation capacity. System under-compensated time (Q) S Not less than 0), the above formula takes the positive sign, and the system over-supplements (Q) S <0) The above formula takes the negative sign. It is generally considered that the TSC compensation capacity Q is low to compensate for TSC And the current reactive demand Q of the system S Equal, i.e. low make-up TSC compensation capacity Q TSC =Q S 。
In the first case: the reactive demand of the system is less than or equal to the minimum switching compensation capacity of the high-voltage filtering and reactive compensation device, and the reactive power fluctuation of the system caused by the rapid start-stop of a small load (such as a motor) corresponding to the reactive demand is only required to be carried out by a low compensation part aiming at the load change characteristic, and the high-voltage FC part does not act. When the controller detects that the system reactive power is inductive and meets the minimum group input condition of low compensation, the input timing is started, the system reactive power demand is continuously increased but does not exceed the total compensation capacity of low compensation when the time is up and the minimum group is input, and the larger compensation capacity is continuously input. And all compensation capacity is input until low compensation and high compensation are carried out. And conversely, the reactive demand of the system is reduced, and the system is capacitive. And the low compensation height cuts off the capacitor bank which is already put into the low compensation height, and if the reactive demand of the system is balanced at the moment, the low compensation height keeps the current compensation output. If the reactive demand of the system is continuously reduced, the low compensation can continuously cut off the capacitor which is put into use until all the capacitor is cut off, and the output of the port is locked.
In the second case: system reactive demand>The minimum switching compensation capacity of the high-voltage filtering and reactive power compensation device actually corresponds to the large load change of a system, and is characterized in that: the stability and the slow change are the main parts of the reactive compensation of the system. In this case, the low boost device operates, and the high pressure FC also operates. The low compensation and high response speed is high, the operation is performed firstly, the high-voltage FC compensation response speed is low, and the operation is performed afterwards. When the reactive demand of the system is increased and exceeds the minimum switching compensation capacity of the high-voltage filtering and reactive compensation device. The TSC with low compensation height and the FC with high pressure start the input delay timing at the same time, and the TSC with low compensation height is firstly input with proper compensation capacity Q due to the high compensation response speed of the TSC with low compensation height Low benefit height The port outputs an input/output (I/O) distribution table (denoted as IO table), and at this time, the system reactive demand Q is equal to the system reactive demand Q S Reduction of Q Low benefit height （Q Low benefit height = low make-up TSC total compensation capacity). And the reactive control quantity Q of the high-voltage FC FC Need to make corresponding adjustments (Q) FC =Q S +Q Low benefit height Wherein Q is S Representing the current reactive demand of the system), keeping the current reactive demand unchanged, continuing to time until the delay time is up, inputting proper compensation capacity, outputting a high-voltage FC capacity combination IO meter by a port, inputting a high-voltage capacitor bank, and commanding the low-compensation TSC device to cut the inputted equivalent capacity. The low boost TSC is ready after exiting the capacitor that has been switched in. When the reactive demand continues to increase, the low-compensation TSC still responds first, corresponding compensation capacity is put in until all compensation capacity is put in, at the moment, the actual reactive demand of the system already exceeds the next-stage capacity combination of the high-voltage FC compensation capacity, the delay time is up, the high-voltage FC port outputs proper capacity in a conversion mode, and the low-compensation TSC is instructed to cut off the equal capacity which is put in. By analogy, when the reactive demand of the system reaches the maximum, the compensation of the high-voltage FC and the low-compensation TSC can be completely input. When the system reactive demand is reduced and an over-complementing condition occurs. Low height-compensated TSC if it is investmentIn the state, the capacitor bank which is already put into the system is cut off firstly until all the capacitor bank is cut off finally, the reactive demand of the system is over compensated and exceeds the minimum compensation capacity of the high-voltage FC which is already put into the system, the low compensation TSC and the high-voltage FC start the cut-off delay timing simultaneously, and the proper compensation capacity Q is cut off firstly because the low compensation response speed is high Low benefit height Output of low-compensation high-capacity combined IO meter and system reactive demand Q S Increasing Q Low benefit height （Q Low benefit height = low make-up TSC total compensation capacity). And the reactive control quantity Q of the high-voltage FC FC Need to make corresponding adjustments (Q) FC =Q S -Q Low benefit height Wherein Q is S Representing the current reactive demand of the system), keeping the current reactive demand unchanged, continuing timing until the delay time is up, cutting off proper compensation capacity, outputting a high-voltage FC capacity combination IO meter by a port, cutting off a high-voltage capacitor bank, and commanding the low-compensation TSC to be put into equal capacity. When the reactive demand continues to be reduced, the low-compensation TSC still responds first, the corresponding compensation capacity is cut off until all the compensation capacity which is put into use is cut off, at the moment, the actual reactive demand of the system is lower than the next-stage capacity combination of the high-voltage FC compensation capacity, the delay time is up, the high-voltage FC port converts and outputs the appropriate capacity, and the low-compensation TSC is instructed to put into the equal capacity. By analogy, when the reactive demand of the system is reduced to the minimum, the compensation of the high-voltage FC and the low-compensation TSC can be completely cut off, and the output of the port is locked.
This system is applied to high-pressure side reactive compensation, and main constitutional components includes: the system comprises a control system (comprising a voltage transformer and a current transformer), a high-voltage FC type filtering and reactive power compensation device, a step-up transformer and a 660V low-voltage dynamic reactive power compensation TSC device. Wherein high pressure FC type filtering and reactive power compensator include: high-voltage power capacitor bank, vacuum contactor, discharge coil, lightning arrester, etc.; the low-voltage dynamic reactive power compensation TSC device comprises: the low-voltage power capacitor bank comprises a thyristor, a resistance-capacitance absorption loop, a low-voltage power capacitor bank and the like, wherein when the thyristor switches the capacitor, the on-off current of the switch is at a zero crossing point, so that no inrush current exists, and the impact on a power grid is small.
For example, the output voltage of the field transformer is 10KV, and the reactive compensation demand is 4.5MVar; four groups of high-voltage fixed FC reactive compensation configurations are respectively as follows: 500Kvar, 1000 Kvar, 1500 Kvar and total capacity of 4Mvar, and is mainly responsible for reactive compensation during long-time stable operation of heavy load and heavy load; the low-boost TSC is configured with two groups of total capacity 500Kvar (0.5 Mvar), and each group of capacity can be equal capacity or can be coded according to 8421: group capacity 166Kvar, group capacity 333 Kvar; the voltage grade is 660V, the capacity of the step-up transformer is 630KVA (the coefficient is selected to be 1.2 times), and the step-up transformer is mainly responsible for a quick reactive compensation task with small load change.
In the first case: and when the reactive demand variation of the system is more than 500Kvar and less than 500Kvar, the low-boost TSC device acts, and the high-voltage FC part does not act.
In the second case: the system reactive demand variation is more than or equal to 500Kvar or less than or equal to-500 Kvar, the low-compensation TSC device acts, the high-voltage FC also acts, the response speed of the low-compensation TSC is high, and the compensation reaction speed of the high-voltage FC is low. When the reactive demand of the system is increased, the system is in an under-compensated state. The first situation occurs, which is mainly completed by the low height-supplementing TSC part, and the high-pressure FC part does not act; the system reactive demand continues to increase, and a second situation occurs: namely, the system reactive demand variation exceeds the minimum group compensation capacity (500 Kvar) of the high-voltage FC, the low-compensation TSC and the high-voltage FC start the compensation timing at the same time, and the low-compensation TSC is firstly put into the proper compensation capacity Q due to the high compensation response speed Low benefit height Output high-voltage FC capacity combination IO meter of port and system reactive demand Q S And (4) reducing. And the reactive control quantity (Q) of the high voltage FC FC =Q S +Q Low benefit height Wherein Q is S Representing the current reactive demand of the system) is not changed, timing is continued until the delay time is up, appropriate compensation capacity is put in, a port output capacity combination IO meter is put in, a high-voltage FC capacitor bank is put in, and the equal capacity which is put in by the low-compensation TSC is cut off. The low heightening TSC exits to be in a standby state. And when the reactive demand of the system is reduced, the system is in an overcompensation state. In the first case: the low-pressure FC part is mainly used for completing the high-pressure compensation part, and the high-pressure FC part does not act; in the second case: the reactive demand of the system is over compensated and exceeds the minimum compensation capacity (500 Kvar), the low compensation height TSC and the high voltage FC start the compensation timing at the same time, and the low compensation height compensation responds fast, so that the system cuts off the proper compensation capacity Q in advance Low compensationHeight of Output of port low-compensation TSC capacity combined IO meter and system reactive demand Q S And (4) increasing. And reactive control quantity (Q) of high voltage FC FC =Q S -Q Low benefit height Wherein Q is S Representing the current reactive demand of the system) is not changed, timing is continued until the delay time is up, proper compensation capacity is cut off, a port outputs a high-voltage FC capacity combination IO meter, a high-voltage capacitor bank is cut off, and low compensation capacity is put into equal capacity again. The low-padding TSC is restored to the original state.
Example two
The embodiment II of the invention provides a combined type high-voltage reactive power compensation system, wherein the system comprises a compensation device controller, a high-voltage filtering and reactive power compensation device, a low-voltage dynamic reactive power compensation TSC device and a step-up transformer;
the compensation device controller is used for judging whether the current reactive power compensation demand of a user power distribution system exceeds the minimum switching compensation capacity of the high-voltage filtering and reactive compensation device, wherein the minimum switching compensation capacity is the minimum operation capacity of switching action of the high-voltage filtering and reactive compensation device;
if the reactive power compensation demand does not exceed the minimum switching compensation capacity, the compensation device controller is used for controlling the low-voltage dynamic reactive power compensation TSC device and the step-up transformer to perform reactive power compensation on the user power distribution system;
and if the reactive power compensation demand exceeds the minimum switching compensation capacity, the compensation device controller is used for controlling the low-voltage dynamic reactive power compensation TSC device, the booster transformer and the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system.
In one possible embodiment, the compensation device controller, when controlling the low-voltage dynamic reactive power compensation TSC device and the step-up transformer to perform reactive power compensation on the consumer distribution system, is specifically configured to:
judging the change condition of the reactive power compensation demand of the user power distribution system in real time;
and controlling the low-voltage dynamic reactive power compensation TSC device to adjust an input compensation capacitor bank according to the change condition of the reactive power compensation demand of the user power distribution system, and performing reactive power compensation on the user power distribution system through the step-up transformer.
In a possible embodiment, the compensation device controller, when being configured to control the capacitor bank of the low-voltage dynamic reactive power compensation TSC device to be put into regulation according to a change of a reactive power compensation demand of the customer distribution system, is specifically configured to:
when the reactive power compensation demand of the user power distribution system is increased to meet a preset first input condition, controlling the low-voltage dynamic reactive power compensation TSC device to increase an input compensation capacitor bank, and performing reactive power compensation on the user power distribution system through the boosting transformer;
when the reactive power compensation demand of the user power distribution system is fluctuated within a preset return difference range, controlling the low-voltage dynamic reactive power compensation TSC device to keep an input compensation capacitor bank, and performing reactive power compensation on the user power distribution system through the step-up transformer;
and when the reactive power compensation demand of the user power distribution system is reduced to a preset first removal condition or the reactive power of the user power distribution system is excessively compensated, controlling the low-voltage dynamic reactive power compensation TSC device to remove the added compensation capacitor bank and performing reactive power compensation on the user power distribution system through the step-up transformer.
In one possible embodiment, the compensation device controller, when used to control the low voltage dynamic reactive power compensation TSC device, the step-up transformer and the high voltage filtering and reactive power compensation device to perform reactive power compensation on the customer distribution system, is specifically configured to:
judging the change condition of the reactive power compensation demand of the user power distribution system in real time;
and controlling a compensation capacitor group of the low-voltage dynamic reactive power compensation TSC device to adjust the input according to the change condition of the reactive power compensation demand of the user power distribution system, performing reactive power compensation on the user power distribution system through the step-up transformer, and then controlling the compensation capacitor group of the high-voltage filtering and reactive power compensation device to adjust the input to perform reactive power compensation on the user power distribution system.
In a possible embodiment, the compensation device controller is specifically configured to, when configured to control the compensation capacitor bank of the low-voltage dynamic reactive power compensation TSC device adjustment input according to a variation of a reactive power compensation demand of the customer distribution system, perform reactive power compensation on the customer distribution system through the step-up transformer, and then control the compensation capacitor bank of the high-voltage filtering and reactive power compensation device adjustment input to perform reactive power compensation on the customer distribution system:
when the reactive power compensation demand of the user power distribution system is increased to meet a preset second input condition, controlling the low-voltage dynamic reactive power compensation TSC device to input a first target capacitor bank, performing reactive power compensation on the user power distribution system through the step-up transformer, then controlling the high-voltage filtering and reactive power compensation device to input a second target capacitor bank to perform reactive power compensation on the user power distribution system after a preset time, and simultaneously controlling the low-voltage dynamic reactive power compensation TSC device to cut off the input first target capacitor bank so as to convert the reactive power compensation of the user power distribution system by using the low-voltage dynamic reactive power compensation TSC device into the reactive power compensation of the user power distribution system by using a high-voltage filter and reactive power compensation device, wherein the capacity of the first target capacitor bank is the same as the capacity of the second target capacitor bank;
when the reactive power compensation demand of the user power distribution system is fluctuated within a preset return difference range, controlling the low-voltage dynamic reactive power compensation TSC device to keep an input capacitor bank, performing reactive power compensation on the user power distribution system through the step-up transformer, and controlling the high-voltage filtering and reactive power compensation device to keep the input capacitor bank to perform reactive power compensation on the user power distribution system;
when the reactive power compensation demand of the user power distribution system is reduced to a preset second removal condition or the reactive power of the user power distribution system is excessively compensated, the low-voltage dynamic reactive power compensation TSC device is controlled to remove a third target capacitor bank, reactive power compensation is conducted on the user power distribution system through the step-up transformer, then the high-voltage filtering and reactive power compensation device is controlled to remove a fourth target capacitor bank after a preset time, meanwhile, the low-voltage dynamic reactive power compensation TSC device is controlled to be put into the third target capacitor bank to conduct reactive power compensation on the user power distribution system, and therefore reactive power compensation conducted on the user power distribution system through the low-voltage dynamic reactive power compensation TSC device is converted into reactive power compensation conducted on the user power distribution system through the high-voltage filtering and reactive power compensation device, wherein the capacity of the third target capacitor bank is the same as the capacity of the fourth target capacitor bank.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The combined high-voltage reactive power compensation system provided by the embodiment of the invention can be specific hardware on equipment or software or firmware installed on the equipment and the like. The system provided by the embodiment of the present invention has the same implementation principle and technical effect as the foregoing method embodiment, and for the sake of brief description, no mention is made in the system embodiment, and reference may be made to the corresponding contents in the foregoing method embodiment. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the foregoing systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system and method may be implemented in other ways. The above-described system embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and there may be other divisions in actual implementation, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments provided by the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention. Are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A combined type high-voltage reactive power compensation method is applied to a combined type high-voltage reactive power compensation system, the combined type high-voltage reactive power compensation system comprises a compensation device controller, a high-voltage filtering and reactive power compensation device, a low-voltage dynamic reactive power compensation (TSC) device and a step-up transformer, and the method comprises the following steps:
the compensation device controller judges whether the current reactive power compensation demand of a user power distribution system exceeds the minimum switching compensation capacity of the high-voltage filtering and reactive compensation device, wherein the minimum switching compensation capacity is the minimum operation capacity of switching action of the high-voltage filtering and reactive compensation device;
if the reactive power compensation demand does not exceed the minimum switching compensation capacity, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device and the step-up transformer to perform reactive power compensation on the user power distribution system;
and if the reactive power compensation demand exceeds the minimum switching compensation capacity, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device, the step-up transformer and the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system.
2. The method of claim 1, wherein the compensation device controller then controls the low voltage dynamic reactive power compensating (TSC) device and the step-up transformer to perform reactive power compensation for the customer distribution system, comprising:
the compensation device controller judges the change condition of the reactive power compensation demand of the user power distribution system in real time;
and the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to adjust an input compensation capacitor bank according to the change condition of the reactive power compensation demand of the user power distribution system, and the user power distribution system is subjected to reactive power compensation through the step-up transformer.
3. The method of claim 2, wherein the compensation device controller controls the low voltage dynamic reactive power compensation TSC device to adjust an input capacitor bank according to changes in a reactive power compensation requirement of the customer distribution system, and wherein reactive power compensation is performed on the customer distribution system via the step-up transformer, comprising:
when the reactive power compensation demand of the user power distribution system is increased to meet a preset first input condition, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to increase an input compensation capacitor bank, and reactive power compensation is carried out on the user power distribution system through the booster transformer;
when the reactive power compensation demand of the user power distribution system fluctuates within a preset return difference range, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to keep an input compensation capacitor bank and perform reactive power compensation on the user power distribution system through the booster transformer;
when the reactive power compensation demand of the user power distribution system is reduced to a preset first removal condition or the reactive power of the user power distribution system is excessively compensated, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to remove an already-used compensation capacitor bank and perform reactive power compensation on the user power distribution system through the step-up transformer.
4. The method of claim 1, wherein the compensation device controller then controls the low voltage dynamic reactive power compensation (TSC) device, the step-up transformer, and the high voltage filtering and reactive compensation device to perform reactive power compensation on the customer distribution system, comprising:
the compensation device controller judges the change condition of the reactive power compensation demand of the user power distribution system in real time;
and the compensation device controller controls a compensation capacitor group which is adjusted and input by the low-voltage dynamic reactive power compensation TSC device according to the change condition of the reactive power compensation demand of the user power distribution system, performs reactive power compensation on the user power distribution system through the step-up transformer, and then controls a compensation capacitor group which is adjusted and input by the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system.
5. The method as claimed in claim 4, wherein the compensating device controller controls the compensating capacitor bank of the low voltage dynamic reactive power compensation TSC device to adjust the input according to the change of the reactive power compensation demand of the user power distribution system, performs reactive power compensation on the user power distribution system through the step-up transformer, and then controls the compensating capacitor bank of the high voltage filtering and reactive power compensation device to adjust the input to perform reactive power compensation on the user power distribution system, comprising:
when the reactive power compensation demand of the user power distribution system is increased to meet a preset second input condition, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to input a first target capacitor bank, reactive power compensation is carried out on the user power distribution system through the boosting transformer, then after a preset time length, the high-voltage filtering and reactive power compensation device is controlled to input a second target capacitor bank to carry out reactive power compensation on the user power distribution system, meanwhile, the low-voltage dynamic reactive power compensation TSC device is controlled to cut off the input first target capacitor bank, so that reactive power compensation carried out on the user power distribution system by using the low-voltage dynamic reactive power compensation TSC device is converted into reactive power compensation carried out on the user power distribution system by using a high-voltage filter and reactive power compensation device, wherein the capacity of the first target capacitor bank is the same as the capacity of the second target capacitor bank;
when the reactive power compensation demand of the user power distribution system fluctuates within a preset return difference range, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to keep an input capacitor bank, reactive power compensation is carried out on the user power distribution system through the boosting transformer, and the high-voltage filtering and reactive power compensation device is controlled to keep the input capacitor bank to carry out reactive power compensation on the user power distribution system;
when the reactive power compensation demand of the user power distribution system is reduced to a preset second cutting condition or the reactive power of the user power distribution system is excessively compensated, the compensation device controller controls the low-voltage dynamic reactive power compensation TSC device to cut a third target capacitor bank, reactive power compensation is conducted on the user power distribution system through the step-up transformer, then the high-voltage filtering and reactive power compensation device is controlled to cut a fourth target capacitor bank after a preset time, meanwhile, the low-voltage dynamic reactive power compensation TSC device is controlled to be put into the third target capacitor bank to conduct reactive power compensation on the user power distribution system, and therefore reactive power compensation conducted on the user power distribution system through the low-voltage dynamic reactive power compensation TSC device is converted into reactive power compensation conducted on the user power distribution system through the high-voltage filtering and reactive power compensation device, wherein the capacity of the third target capacitor bank is the same as the capacity of the fourth target capacitor bank.
6. A combined type high-voltage reactive power compensation system is characterized by comprising a compensation device controller, a high-voltage filtering and reactive power compensation device, a low-voltage dynamic reactive power compensation TSC device and a step-up transformer;
the compensation device controller is used for judging whether the current reactive power compensation demand of a user power distribution system exceeds the minimum switching compensation capacity of the high-voltage filtering and reactive compensation device, wherein the minimum switching compensation capacity is the minimum operation capacity of switching action of the high-voltage filtering and reactive compensation device;
if the reactive power compensation demand does not exceed the minimum switching compensation capacity, the compensation device controller is used for controlling the low-voltage dynamic reactive power compensation TSC device and the step-up transformer to perform reactive power compensation on the user power distribution system;
and if the reactive power compensation demand exceeds the minimum switching compensation capacity, the compensation device controller is used for controlling the low-voltage dynamic reactive power compensation TSC device, the booster transformer and the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system.
7. The system of claim 6, wherein the compensation device controller, when configured to control the low voltage dynamic reactive power compensating TSC device and the step-up transformer to perform reactive power compensation for the consumer distribution system, is specifically configured to:
judging the change condition of the reactive power compensation demand of the user power distribution system in real time;
and controlling the low-voltage dynamic reactive power compensation TSC device to adjust an input compensation capacitor bank according to the change condition of the reactive power compensation demand of the user power distribution system, and performing reactive power compensation on the user power distribution system through the step-up transformer.
8. The system of claim 7, wherein the compensation device controller, when configured to control the low voltage dynamic reactive power compensation TSC device to adjust the capacitor bank that is applied to the consumer power distribution system to perform reactive power compensation to the consumer power distribution system via the step-up transformer, is configured to:
when the reactive power compensation demand of the user power distribution system is increased to meet a preset first input condition, controlling the low-voltage dynamic reactive power compensation TSC device to increase an input compensation capacitor bank, and performing reactive power compensation on the user power distribution system through the boosting transformer;
when the reactive power compensation demand of the user power distribution system fluctuates within a preset return difference range, controlling the low-voltage dynamic reactive power compensation TSC device to keep an input compensation capacitor bank and perform reactive power compensation on the user power distribution system through the step-up transformer,
when the reactive power compensation demand of the user power distribution system is reduced to a preset first removal condition or when the reactive power of the user power distribution system is excessively compensated, the low-voltage dynamic reactive power compensation TSC device is controlled to remove an input compensation capacitor bank and perform reactive power compensation on the user power distribution system through the boosting transformer.
9. The system according to claim 6, wherein the compensation device controller, when configured to control the low voltage dynamic reactive power compensation TSC device, the step-up transformer and the high voltage filtering and reactive power compensation device to perform reactive power compensation for the customer distribution system, is specifically configured to:
judging the change condition of the reactive power compensation demand of the user power distribution system in real time;
and controlling a compensation capacitor bank which is adjusted and input by the low-voltage dynamic reactive power compensation TSC device according to the change condition of the reactive power compensation demand of the user power distribution system, performing reactive power compensation on the user power distribution system through the step-up transformer, and then controlling a compensation capacitor bank which is adjusted and input by the high-voltage filtering and reactive power compensation device to perform reactive power compensation on the user power distribution system.
10. The system of claim 9, wherein the compensation device controller is configured to control the compensation capacitor bank of the low voltage dynamic reactive compensation TSC device adjustment input to perform reactive power compensation on the customer distribution system via the step-up transformer according to a change in a reactive power compensation requirement of the customer distribution system, and then control the compensation capacitor bank of the high voltage filtering and reactive compensation device adjustment input to perform reactive power compensation on the customer distribution system, and is further configured to:
when the reactive power compensation demand of the user power distribution system is increased to meet a preset second input condition, controlling the low-voltage dynamic reactive power compensation TSC device to input a first target capacitor bank, performing reactive power compensation on the user power distribution system through the step-up transformer, then controlling the high-voltage filtering and reactive power compensation device to input a second target capacitor bank to perform reactive power compensation on the user power distribution system after a preset time, and simultaneously controlling the low-voltage dynamic reactive power compensation TSC device to cut off the input first target capacitor bank so as to convert the reactive power compensation of the user power distribution system by using the low-voltage dynamic reactive power compensation TSC device into the reactive power compensation of the user power distribution system by using a high-voltage filter and reactive power compensation device, wherein the capacity of the first target capacitor bank is the same as the capacity of the second target capacitor bank;
when the reactive power compensation demand of the user power distribution system is fluctuated within a preset return difference range, controlling the low-voltage dynamic reactive power compensation TSC device to keep an input capacitor bank, performing reactive power compensation on the user power distribution system through the step-up transformer, and controlling the high-voltage filtering and reactive power compensation device to keep the input capacitor bank to perform reactive power compensation on the user power distribution system;
when the reactive power compensation demand of the user power distribution system is reduced to a preset second removal condition or when the reactive power of the user power distribution system is excessively compensated, controlling the low-voltage dynamic reactive power compensation TSC device to remove a third target capacitor bank, performing reactive power compensation on the user power distribution system through the boosting transformer, then controlling the high-voltage filtering and reactive power compensation device to remove a fourth target capacitor bank after a preset time, and simultaneously controlling the low-voltage dynamic reactive power compensation TSC device to be put into the third target capacitor bank to perform reactive power compensation on the user power distribution system so as to convert the reactive power compensation performed on the user power distribution system by using the low-voltage dynamic reactive power compensation TSC device into the reactive power compensation performed on the user power distribution system by using the high-voltage filtering and reactive power compensation device, wherein the capacity of the third target capacitor bank is the same as the capacity of the fourth target capacitor bank.
CN202310051369.4A 2023-02-02 2023-02-02 Combined type high-voltage reactive power compensation method and system Active CN115800305B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310051369.4A CN115800305B (en) 2023-02-02 2023-02-02 Combined type high-voltage reactive power compensation method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310051369.4A CN115800305B (en) 2023-02-02 2023-02-02 Combined type high-voltage reactive power compensation method and system

Publications (2)

Publication Number Publication Date
CN115800305A true CN115800305A (en) 2023-03-14
CN115800305B CN115800305B (en) 2023-04-18

Family

ID=85429521

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310051369.4A Active CN115800305B (en) 2023-02-02 2023-02-02 Combined type high-voltage reactive power compensation method and system

Country Status (1)

Country Link
CN (1) CN115800305B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101872980A (en) * 2010-06-08 2010-10-27 陈劲游 Method for controlling low-voltage side reactive compensation equipment according to transformer high-voltage side reactive compensation control quantity
CN102412582A (en) * 2011-12-05 2012-04-11 无锡泛尔特电力电子电容器有限公司 High-low voltage hybrid filter compensation device
CN103825287A (en) * 2014-03-14 2014-05-28 武汉理工大学 Quick dynamic reactive-power compensating method of combined electrical load
CN105186531A (en) * 2015-09-15 2015-12-23 安徽佑赛科技有限公司 Hybrid dynamic reactive compensation apparatus and method
JP2017158385A (en) * 2016-03-04 2017-09-07 富士電機株式会社 Voltage compensation device and method for linking inverter in voltage compensation device
CN209150729U (en) * 2019-01-21 2019-07-23 中冶华天南京电气工程技术有限公司 A kind of Comprehensive Reactive Power Compensation system based on PLC control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101872980A (en) * 2010-06-08 2010-10-27 陈劲游 Method for controlling low-voltage side reactive compensation equipment according to transformer high-voltage side reactive compensation control quantity
CN102412582A (en) * 2011-12-05 2012-04-11 无锡泛尔特电力电子电容器有限公司 High-low voltage hybrid filter compensation device
CN103825287A (en) * 2014-03-14 2014-05-28 武汉理工大学 Quick dynamic reactive-power compensating method of combined electrical load
CN105186531A (en) * 2015-09-15 2015-12-23 安徽佑赛科技有限公司 Hybrid dynamic reactive compensation apparatus and method
JP2017158385A (en) * 2016-03-04 2017-09-07 富士電機株式会社 Voltage compensation device and method for linking inverter in voltage compensation device
CN209150729U (en) * 2019-01-21 2019-07-23 中冶华天南京电气工程技术有限公司 A kind of Comprehensive Reactive Power Compensation system based on PLC control

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
凌鹏飞;: "混合型无功补偿装置在配电网中的应用" *
孙绪臣;: "补偿装置在无功补偿中的应用" *

Also Published As

Publication number Publication date
CN115800305B (en) 2023-04-18

Similar Documents

Publication Publication Date Title
CN110544938B (en) Low-voltage microgrid grid-connected and off-grid control method containing battery and super capacitor
CN103238258B (en) Reactive power compensator, computer programs and computer program products
CN107482641B (en) SVG control method working with intelligent capacitor bank
CN102130460A (en) Capacitor commutated converter (CCC)-based high voltage DC transmission reactive power harmonic control realization method
CN115800305B (en) Combined type high-voltage reactive power compensation method and system
CN114744689B (en) Reactive power coordination control method and system for new energy station with distributed phase modulators
CN103050979B (en) Calculation method of voltage of connecting bus of static var compensator of power grid
Rahmani et al. A new combination of shunt hybrid power filter and thyristor controlled reactor for harmonics and reactive power compensation
CN211579602U (en) Line reactive voltage intelligent regulation system suitable for petrochemical sudden change load
CN205232070U (en) Marine motor starts compensation arrangement
CN212572088U (en) High-voltage current-limiting compensation soft starting device
CN112072958A (en) Soft start system
ElMoursi et al. Voltage stabilization and reactive compensation using a novel FACTS STATCOM scheme
CN110571820B (en) Joint voltage regulation control method for multiple reactive compensation devices of transformer substation
Khederzadeh Coordination control of statcom and ultc of power transformers
CN110311387B (en) Control method, device and equipment for hybrid reactive power compensation device
Miura et al. Virtual Synchronous Machine Control Applied to Solid State Transformer
CN111756051B (en) Direct-current transmission reactive compensation device, control method and system
Abdelmohsen et al. Comparative Study of SVC and STATCOM Performance on Reactive Power Compensation in Hot Strip Mill
CN206628833U (en) A kind of reactive power compensator
CN201138753Y (en) Pressure regulating typed reactive compensator
Basnet et al. Dynamic-Static Var Compensation for Improving Power Factor
CN115333081A (en) Power grid regulation and control method, device and system and nonvolatile storage medium
Xu The application of reactive power compensation technology in electrical automation engineering
CN115276075A (en) Island micro-grid system and control method of energy storage unit VSG inverter thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant