CN212543372U - Flexible compensation system of distribution network - Google Patents
Flexible compensation system of distribution network Download PDFInfo
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- CN212543372U CN212543372U CN202022006268.XU CN202022006268U CN212543372U CN 212543372 U CN212543372 U CN 212543372U CN 202022006268 U CN202022006268 U CN 202022006268U CN 212543372 U CN212543372 U CN 212543372U
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- 239000011787 zinc oxide Substances 0.000 claims description 4
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- 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
- Y02E40/30—Reactive power compensation
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- 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
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- 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
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- 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
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- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention relates to a power distribution network flexible compensation system which comprises compensation equipment arranged on a power supply line, wherein the compensation equipment comprises a first transformer, a current transformer, a quick bypass switch and a second transformer, the first transformer is connected on the power supply line in parallel, the current transformer is connected with the first transformer in series, the quick bypass switch is connected with the first transformer in series, the second transformer is connected on the power supply line in series, the first transformer is a step-down device, the input end of the first transformer is connected with the power supply line, the output end of the first transformer is connected with the input end of the current transformer, the output end of the current transformer is connected with the input end of the quick bypass switch, the output end of the quick bypass switch is connected with the second transformer, and. After the power distribution network compensation system is connected to a power distribution network, harmonic waves, voltage deviation, voltage fluctuation, flicker and three-phase unbalanced loads in the power distribution network can be effectively limited, and various electric energy quality indexes of the power distribution network are comprehensively improved.
Description
Technical Field
The invention relates to a power distribution network flexible compensation system, and belongs to the field of power electronics.
Background
With the implementation of the energy internet strategy, the power grid becomes a hub in energy collection, transmission and conversion utilization, and bears the social responsibility of providing safe, high-quality and sustainable energy and power supply for economic social development and beautiful life of people. In recent years, new energy power generation equipment such as wind energy and solar energy, and electric power electronics of electric power consumption terminals such as electrified railways, large-capacity smelting, port shore power and the like enable nonlinear, impact and fluctuating equipment to be widely distributed in a power grid, and generated power quality disturbance is spread across voltage levels and areas in the power grid, so that potential risks are brought to high-quality power supply and high-efficiency operation of the power grid. Meanwhile, the requirements and concerns of power consumers on the quality of electric energy are increasing due to the large-scale construction of high-end manufacturing industries, data centers, transportation hubs and the like with higher requirements on the quality of power supply. Particularly, in a 10kV or 35kV power distribution network, the disturbance of the power quality is the most serious, the influence on most power users is the most extensive, and the requirement on the power quality control is the most urgent.
According to the existing national standard, the electric energy quality disturbance comprises harmonic waves, voltage deviation, frequency deviation, voltage fluctuation, flicker, three-phase voltage unbalance and the like, and the main electric energy quality treatment means at the present stage is mainly to add a dynamic reactive power compensation device, SVC or a filter bank at the grid-connected point of the electric energy quality disturbance load so as to compensate reactive power, inhibit voltage fluctuation and filter harmonic current, or filter load harmonic waves through an active filter bank APF; the voltage compensation is carried out through a dynamic voltage compensator DVR or dynamic on-load voltage regulation so as to improve the voltage drop caused by remote power supply and the like. No matter which power quality treatment equipment can only treat one or two power quality disturbances, all the power quality disturbances cannot be comprehensively and comprehensively treated, and various power quality treatment means at present have large occupied area, high cost and poor cooperativity, so that the aim of comprehensively treating the whole power quality based on the whole power distribution network cannot be fulfilled.
Disclosure of Invention
In order to realize the overall electric energy quality comprehensive treatment target based on the whole power distribution network, the invention provides the power distribution network flexible compensation system, and after the power distribution network flexible compensation system is connected to the power distribution network, the power distribution network flexible compensation system can effectively limit harmonic waves, voltage deviation, voltage fluctuation and flicker and three-phase unbalanced load in the power distribution network, comprehensively improve various electric energy quality indexes of the power distribution network, greatly reduce various electric energy quality disturbances of the power distribution network, and ensure the safe and stable operation of the power distribution network.
The technical scheme adopted by the invention is as follows: the utility model provides a distribution network flexible compensation system, is including setting up the compensation equipment in the power supply line, the compensation equipment include parallelly connected first transformer on the power supply line, with the converter that first transformer is established ties, with the quick bypass switch that first transformer is established ties and establish ties second transformer on the power supply line, first transformer is the step-down transformer, the input of first transformer is connected the power supply line, the output of first transformer is connected the converter input, the output of converter is connected the input of quick bypass switch, the output of quick bypass switch is connected the second transformer, and the electric current warp behind the first transformer step-down process in proper order converter, quick bypass switch and the second transformer back cluster go into power supply equipment.
Furthermore, a low-voltage circuit breaker is arranged between the first transformer and the converter and is connected in series between the first transformer and the converter.
Furthermore, two isolating switches with grounding disconnecting links are connected in series on the power supply line, and the two isolating switches with grounding disconnecting links are respectively arranged at two ends of the second transformer.
Further, the current transformer is a three-phase cross-direct-alternating current transformer.
Furthermore, quick bypass switch includes ac contactor, the positive and negative parallel pair of thyristor and arrester, ac contactor, the positive and negative parallel pair of thyristor and arrester parallel connection.
Furthermore, the arrester is a zinc oxide metal arrester, the thyristor forward and reverse parallel pair comprises a forward thyristor and a reverse thyristor which are arranged in parallel, and the forward thyristor and the reverse thyristor are connected in parallel and then are connected in parallel with the alternating current contactor and the arrester.
Further, the transformation ratio of the first transformer is 10kV/0.4kV, and the transformation ratio of the second transformer is 1.25kV/0.4 kV.
Furthermore, the power supply line is connected in parallel with a high-voltage bypass switch, and the high-voltage bypass switch is connected in parallel with the compensation equipment.
The beneficial effects produced by the invention comprise: 1) the invention adopts a method of combining series compensation and parallel compensation to compensate the power quality disturbance of the distribution network. The controllable voltage is connected in series in the power supply line to compensate voltage drop, and accurate vector compensation can be realized on voltage drop of each phase caused by load active power and reactive power on a line resistor and a reactance; the controllable current is injected into the power supply line in parallel to compensate the reactive, harmonic and negative sequence current, and the reactive current, the harmonic current and the negative sequence current in the power supply line can be accurately eliminated. The method has more direct and accurate compensation effect on various power quality disturbances, and has more obvious effect of comprehensively improving the power quality of the power supply line of the power distribution network.
2) The invention adopts the modular design of the topological structure of the AC-DC-AC converter, the capacities of the series compensation and the parallel compensation can be flexibly matched, and the flexible configuration of different capacities of the series compensation and the parallel compensation can be carried out according to the transmission power of a power supply line and the depth requirement of the voltage reduction of the power supply line, thereby achieving the optimal power quality compensation effect.
3) The installation position of the power distribution network flexibility compensation Device (DFC) formed by the invention is not limited to the end of the line, and the DFC can be randomly selected and arranged in sections along the power supply line. The power supply radius can be greatly enlarged, the number of power supply substations is reduced, meanwhile, the device occupies a small area and is low in cost, investment in construction of a power distribution network can be greatly saved, and good economic benefits can be generated particularly in the aspect of enlarging the power supply radius of the power distribution network.
Drawings
FIG. 1 is a schematic diagram of the operation of a series-parallel hybrid power distribution network flexible compensation system;
FIG. 2 is a main circuit wiring diagram of a series-parallel hybrid power distribution network flexible compensation system;
fig. 3 is a wiring diagram of a low-voltage fast bypass switch of a power distribution network flexibility compensation system.
Detailed Description
The present invention is explained in further detail below with reference to the drawings and the specific embodiments, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
The distribution network flexible compensation system (DFC for short) comprises a first transformer, a low-voltage circuit breaker, a current transformer, a rapid bypass switch and a second transformer, wherein the operating voltage of a power supply line is reduced to 400V through the first transformer (hereinafter referred to as a parallel transformer TB), the operating voltage of the power supply line is connected into a three-phase cross-direct-alternating current converter BLQ after passing through a low-voltage circuit breaker BK, and the output voltage of the current transformer is connected into the power supply line in series through a series transformer TS after passing through a rapid bypass switch TBS.
And a supplementary circuit formed by the first transformer, the low-voltage circuit breaker, the current transformer, the quick bypass switch and the second transformer is connected in series into a power supply line through 2 isolating switches QS1 and QS2 with earthing knife switches, and the compensation equipment is connected in series with 2 isolating switches and then connected in parallel with 1 bypass switch SW. When the compensation equipment is put into operation, the bypass switch SW is opened, the isolation switches QS1 and QS2 are closed, the supplement circuit exits the operation, the bypass switch SW is closed, the isolation switches QS1 and QS2 are opened, and the grounding switch is closed.
The rapid bypass switch TBS is formed by connecting a low-voltage alternating current contactor 1, a bidirectional tense anti-parallel pair 2 and a zinc oxide arrester MOV3 in parallel, when a rapid bypass is needed, the thyristor anti-parallel pair is firstly triggered to be conducted, and then the low-voltage alternating current contactor is closed, so that the rapid closing of the rapid bypass switch TBS is realized. The main wiring diagram of the distribution network flexibility compensation system (DFC) is shown in figure 2, and the main wiring diagram of the fast bypass switch TBS is shown in figure 3.
The high-voltage bypass switch SW is used for closing a power supply circuit when the device quits operation;
the high-voltage isolation disconnecting link and grounding disconnecting links QS1 and QS2 are used for inputting/cutting off the DFC voltage compensation device, the isolation disconnecting link is separated when the device is quitted to operate and is switched to be overhauled, and the grounding disconnecting link is closed;
the lightning arresters V1 and V2 are used for absorbing line overvoltage;
the step-down transformer TB (10 kV/0.4 kV) is used for providing an alternating current power supply for the converter;
the series transformer TS (1.25 kV/0.4 kV) is used for coupling and inserting compensation voltage on a device on a line;
the low-voltage circuit breaker BK is used for protecting the input power supply of the converter;
the AC-DC-AC converter BLQ consists of a bidirectional full-bridge AC-DC-AC converter module, has an input voltage of 400V and an output voltage of 400V and is used for converting the amplitude and the phase of the voltage;
the low-voltage thyristor rapid bypass switch TBS is formed by connecting an alternating current contactor 1, a thyristor positive and negative parallel pair 2 and a lightning arrester 3 in parallel and is used for rapidly bypassing a series transformer valve side winding during conversion action;
the low-voltage current transformer CT is used to measure the line current.
The invention adopts a method of combining series compensation and parallel compensation to restrain various power quality disturbances of the power grid. The principle of a flexible compensation system (DFC for short) of a power distribution network is that a power supply line is connected into a power electronic three-phase crossing-direct-alternating current converter through a voltage reduction transformer connected in parallel, alternating current voltage generated by the converter is coupled and superposed on the power supply line through a series transformer and used for compensating voltage drop of the power supply line, and the tail end voltage of the power supply line is always in a qualified power supply voltage range. Meanwhile, the three-phase cross-DC-AC converter injects alternating current into a power supply line through a step-down transformer which is connected in parallel with the line, and is used for compensating (reversely counteracting) reactive current, harmonic current and negative sequence current of the power supply line, so that the power supply power factor, the harmonic distortion rate and the negative sequence voltage of the power supply line are all in a qualified power supply range. The series compensation voltage and the parallel compensation current output by the power electronic AC-DC-AC converter are quickly and automatically tracked and compensated according to the requirement of the actual running condition of the line, so that various electric energy quality indexes reach the optimal effect. The working principle of the flexibility compensation system of the power distribution network is shown in figure 1.
1) The parallel current compensation and the series voltage compensation are combined with each other, and the three-phase cross-direct-alternating current converter is connected between the parallel transformer and the series transformer for power exchange, so that the method for comprehensively treating the power quality disturbance of voltage drop, harmonic wave, reactive power, three-phase load imbalance and the like of the power distribution network is realized. See figure 1.
2) The three-phase cross-DC-AC converter is connected between the parallel transformer and the series transformer to realize power exchange, the bypass switch is connected with the series transformer in parallel to realize the switching on and off of the device, and the isolation switch is connected in series to realize the switching on and off of the device, and the wiring method of the power distribution network flexibility compensation system for grounding maintenance is shown in an attached figure 2.
3) The wiring method of the low-voltage rapid bypass switch TBS of the power distribution network flexible compensation system (DFC) is formed by connecting a low-voltage alternating-current contactor 1, a forward and reverse thyristor parallel pair 2 and a zinc oxide metal arrester 3 in parallel, wherein the thyristor forward and reverse parallel pair 2 comprises a forward thyristor 201 and a reverse thyristor 202 which are arranged in parallel, and the method is shown in an attached figure 3.
The power quality control system has the characteristics of simple structure, low operation voltage, low cost and small occupied area, and is convenient for wide application in power quality control of 10 kV-110 kV power distribution networks. The design advantages are as follows:
1) the method adopts a method of combining series compensation and parallel compensation to compensate the power quality disturbance of the distribution network. The controllable voltage is connected in series in the power supply line to compensate voltage drop, and accurate vector compensation can be realized on voltage drop of each phase caused by load active power and reactive power on a line resistor and a reactance; the controllable current is injected into the power supply line in parallel to compensate the reactive, harmonic and negative sequence current, and the reactive current, the harmonic current and the negative sequence current in the power supply line can be accurately eliminated. The method has more direct and accurate compensation effect on various power quality disturbances, and has more obvious effect of comprehensively improving the power quality of the power supply line of the power distribution network.
2) The method adopts the modular design of the topological structure of the AC-DC-AC converter, the capacities of the series compensation and the parallel compensation can be flexibly matched, and the flexible configuration of different capacities of the series compensation and the parallel compensation can be carried out according to the transmission power of a power supply line and the depth requirement of the voltage reduction of the power supply line, so that the optimal power quality compensation effect is achieved.
3) The installation position of the power distribution network flexible compensation Device (DFC) formed by the method is not limited to the tail end of the line, and the DFC can be randomly selected and arranged in sections along the power supply line. The power supply radius can be greatly enlarged, the number of power supply substations is reduced, meanwhile, the device occupies a small area and is low in cost, investment in construction of a power distribution network can be greatly saved, and good economic benefits can be generated particularly in the aspect of enlarging the power supply radius of the power distribution network.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting of the claimed invention.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the content of the embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the technical scope of the present invention, and any changes and modifications made are within the protective scope of the present invention.
Claims (8)
1. The utility model provides a distribution network flexibility compensation system which characterized in that: the compensation equipment comprises a first transformer, a current transformer, a quick bypass switch and a second transformer, wherein the first transformer is connected in parallel on a power supply line, the current transformer is connected in series with the first transformer, the quick bypass switch is connected in series with the first transformer, the second transformer is connected on the power supply line, the first transformer is a step-down transformer, the input end of the first transformer is connected with the power supply line, the output end of the first transformer is connected with the input end of the current transformer, the output end of the current transformer is connected with the input end of the quick bypass switch, the output end of the quick bypass switch is connected with the second transformer, and current passes through the current transformer, the quick bypass switch and the second transformer in series after being stepped down by the first transformer.
2. The power distribution network compliance compensation system of claim 1, wherein: and a low-voltage circuit breaker is arranged between the first transformer and the converter and is connected between the first transformer and the converter in series.
3. The power distribution network compliance compensation system of claim 1, wherein: and two isolating switches are also connected in series on the power supply line and are respectively arranged at two ends of the compensation equipment.
4. The power distribution network compliance compensation system of claim 1, wherein: the converter is a three-phase cross-direct-alternating current converter.
5. The power distribution network compliance compensation system of claim 1, wherein: the rapid bypass switch comprises an alternating current contactor, a thyristor positive and negative parallel pair and a lightning arrester, wherein the alternating current contactor, the thyristor positive and negative parallel pair and the lightning arrester are connected in parallel.
6. The power distribution network compliance compensation system of claim 5, wherein: the lightning arrester is a zinc oxide metal lightning arrester, the thyristor forward and reverse parallel pairs comprise a forward thyristor and a reverse thyristor which are arranged in parallel, and the forward thyristor and the reverse thyristor are connected in parallel and then are connected with the alternating current contactor and the lightning arrester in parallel.
7. The power distribution network compliance compensation system of claim 5, wherein: the transformation ratio of the first transformer is 10kV/0.4kV, and the transformation ratio of the second transformer is 1.25kV/0.4 kV.
8. The power distribution network compliance compensation system of claim 1, wherein: the power supply line is connected with a high-voltage bypass switch in parallel, and the high-voltage bypass switch is connected with the compensation equipment in parallel.
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| CN111987725A (en) * | 2020-09-14 | 2020-11-24 | 北京拉斐叶电力科技有限公司 | Flexible compensation system of distribution network |
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| CN111987725A (en) * | 2020-09-14 | 2020-11-24 | 北京拉斐叶电力科技有限公司 | Flexible compensation system of distribution network |
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