CN212412767U - Medium-voltage distribution network electric energy quality control system - Google Patents
Medium-voltage distribution network electric energy quality control system Download PDFInfo
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- CN212412767U CN212412767U CN202021923906.8U CN202021923906U CN212412767U CN 212412767 U CN212412767 U CN 212412767U CN 202021923906 U CN202021923906 U CN 202021923906U CN 212412767 U CN212412767 U CN 212412767U
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Abstract
The utility model discloses a medium voltage distribution network electric energy quality control system, which comprises a system controller, a transformer substation regulating unit, a medium voltage line regulating unit, a medium voltage terminal regulating unit, a current sampling unit and a voltage sampling unit, wherein the transformer substation regulating unit comprises a first medium voltage chained SVG and a first medium voltage passive reactive compensation which are connected in parallel on a medium voltage bus of the transformer substation; the medium-voltage line regulation and control unit comprises a medium-voltage series voltage quality regulator which is connected in series in the medium-voltage line; the medium-voltage terminal regulation and control unit comprises a second medium-voltage chained SVG and a second medium-voltage passive reactive compensation which are connected to the medium-voltage line terminal in parallel; the system controller is connected with the power grid through the current sampling unit and the voltage sampling unit and is used for collecting current and voltage of the power grid. The utility model discloses can effectively solve the multiple electric energy quality problem of medium voltage distribution network, reduce the loss of system as far as possible when guaranteeing that the management is effectual.
Description
Technical Field
The utility model relates to a distribution network electric energy quality regulates and control technical field, concretely relates to medium voltage distribution network electric energy quality control system.
Background
The medium voltage distribution network is divided into the following links from the difference of the transmission link and the electric energy consumption object of electric energy: according to the difference of the use and the demand of each link on electric energy, the quality problems of various electric energy of a transformer substation, a medium-voltage line and a medium-voltage terminal have difference and consistency, and the reasons of the quality problems of the same electric energy of different links have difference, in a medium-voltage distribution network, the traditional voltage reactive power regulation and control method depends on transformer substations, lines and distribution transformer voltage reactive power regulation and control equipment, and local independent control and regulation are carried out by detecting local voltage values, active power values, reactive power values, power factors and the like, but the cause of the quality problems of the electric energy is often multi-aspect and multi-level, so that Chinese patent application No. 201910791449.7 provides a multi-level coordination control system for the voltage quality of the distribution network, mainly aims at the regulation of the voltage and the coordination of the voltage quality of the distribution line with the coverage range of 10kv to before low-voltage distribution transformer, by monitoring the voltage, various reactive compensation capacitors are regulated and controlled, and the voltage is regulated. The voltage quality of the distribution line is not only related to reactive power but also related to other factors, and in terms of a management method, other power functional units, such as AVC (automatic voltage control), on-load voltage regulators and the like, need to be fully considered through reactive power management. Meanwhile, for a low-voltage power distribution network, the problem of power quality is more and more prominent, and the problem of power quality not only causes the problem of voltage, but also causes the increase of line loss rate of a line. How to solve the above technical problems is a matter that those skilled in the art are dedicated to solve.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of prior art, provide a medium voltage distribution network electric energy quality control system.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a power quality control system of a medium-voltage distribution network comprises a system controller, a transformer substation regulation and control unit, a medium-voltage line regulation and control unit, a medium-voltage terminal regulation and control unit, a current sampling unit and a voltage sampling unit,
the transformer substation regulation and control unit comprises a first medium-voltage chained SVG and a first medium-voltage passive reactive compensation which are connected to a medium-voltage bus of the transformer substation in parallel;
the medium-voltage line regulation and control unit comprises a medium-voltage series voltage quality regulator which is connected in series into the medium-voltage line;
the medium-voltage terminal regulation and control unit comprises a second medium-voltage chained SVG and a second medium-voltage passive reactive compensation which are connected to the medium-voltage line terminal in parallel;
the system controller is connected with the power grid through a current sampling unit and a voltage sampling unit and is used for collecting the current and the voltage of the power grid;
the system controller is respectively in communication connection with the transformer substation regulation and control unit, the medium-voltage line regulation and control unit and the medium-voltage terminal regulation and control unit and is used for realizing operation regulation of the regulation and control units.
Preferably, the system controller is composed of a communication unit and a coordination control unit.
As a specific implementation mode, the communication unit adopts 4G/5G wireless communication, and communication interaction of data and control instructions between the system controller and other units is established;
and the coordination control unit performs logic analysis and system scheduling control according to the voltage and power factor data of each regulation and control unit.
Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage: the utility model discloses a medium voltage distribution network electric energy quality control system utilizes the advantage of medium voltage chain SVG, the passive compensator of middling pressure, the tandem type voltage quality regulator of middling pressure and middling pressure terminal regulation and control unit, through fully excavating the transformer substation, middling pressure circuit, the regulation and control margin of terminal regulation and control equipment, promotes medium voltage distribution system's regulation and control potentiality, makes medium voltage distribution network electric energy quality level be in better state, promotes power supply quality and power supply reliability, the line net damage rate of simultaneous reduction system.
Drawings
Fig. 1 is a structural diagram of a power quality control system of a medium voltage distribution network according to the present invention;
fig. 2 is a logic diagram of the power quality control system of the medium-voltage distribution network according to the present invention, regarding the power quality and voltage multi-level coordination control strategy.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.
A medium-voltage distribution network power quality control system comprises a system controller, a transformer substation regulation and control unit, a medium-voltage line regulation and control unit, a medium-voltage terminal regulation and control unit, a current sampling unit and a voltage sampling unit.
The transformer substation regulating and controlling unit comprises a first medium-voltage chained SVG and a first medium-voltage passive reactive compensation which are connected in parallel to a medium-voltage bus of a transformer substation, reactive compensation is preferentially carried out, coarse adjustment is carried out by adopting the first medium-voltage passive reactive compensation, and fine compensation is carried out by adopting the first medium-voltage chained SVG;
the medium-voltage line regulation and control unit comprises a medium-voltage series voltage quality regulator which is connected in series in the medium-voltage line; the medium-voltage terminal regulation and control unit comprises a second medium-voltage chained SVG and a second medium-voltage passive reactive compensation which are connected to the medium-voltage line terminal in parallel; the system controller is connected with the power grid through the current sampling unit and the voltage sampling unit and is used for collecting the current and the voltage of the power grid; the system controller is respectively in communication connection with the transformer substation regulation and control unit, the medium-voltage line regulation and control unit and the medium-voltage terminal regulation and control unit and is used for realizing operation regulation of the regulation and control units.
In this example, the system controller is composed of a communication unit and a coordination control unit. Specifically, the communication unit adopts 4G/5G wireless communication, and establishes communication interaction of data and control instructions between the system controller and other units; and the coordination control unit is used for carrying out logic analysis and system scheduling control according to the voltage and power factor data of each regulation and control unit.
All the electric energy quality regulation and treatment devices (units) of the control system have an automatic regulation control function and a remote control regulation function.
The multi-stage coordination control strategy is based on the following principle:
a. each level of device has the capabilities of self detection, self control and self management;
b. receiving the scheduling control of a system controller on the basis of automatic control operation;
c. the system preferentially carries out reactive power treatment and then carries out system coordination optimization treatment based on a voltage target.
When the control system is used for regulation and control, the specific steps are as follows:
step 1, transmitting transformer substation voltage and power factor data to a system controller, transmitting medium-voltage line voltage and power factor data to the system controller, and transmitting medium-voltage terminal voltage and power factor data to the system controller;
step 2, sequentially judging power factors of the medium-voltage terminal regulation and control unit, the medium-voltage line and the transformer substation, if the power factors are not satisfied, performing local reactive compensation (if the transformer substation is subjected to coarse adjustment by a first medium-voltage passive reactive compensation, namely a reactive compensation capacitor, and a dynamic compensation part is subjected to fine adjustment and compensation by a first medium-voltage chained SVG), if all the power factors are qualified, skipping to step 3;
step 3, judging whether the output voltage of the transformer substation is qualified, if not qualified, skipping to step 4, and if qualified, skipping to step 5;
step 4, regulating the output voltage of the transformer substation to a qualified voltage;
step 5, further judging whether the medium voltage line voltage is qualified, if not, skipping to step 6, otherwise, skipping to step 7;
step 6, adjusting the output of the series voltage quality regulator until the voltage of the medium-voltage line reaches the rated voltage;
step 7, judging whether the medium voltage terminal voltage is qualified, if not, skipping to step 8, otherwise, skipping to step;
and 8, further regulating the output voltage of the series voltage quality regulator to be within a qualified voltage range and higher than the rated voltage.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (3)
1. A power quality control system of a medium-voltage distribution network is characterized by comprising a system controller, a transformer substation regulation and control unit, a medium-voltage line regulation and control unit, a medium-voltage terminal regulation and control unit, a current sampling unit and a voltage sampling unit,
the transformer substation regulation and control unit comprises a first medium-voltage chained SVG and a first medium-voltage passive reactive compensation which are connected to a medium-voltage bus of the transformer substation in parallel;
the medium-voltage line regulation and control unit comprises a medium-voltage series voltage quality regulator which is connected in series into the medium-voltage line;
the medium-voltage terminal regulation and control unit comprises a second medium-voltage chained SVG and a second medium-voltage passive reactive compensation which are connected to the medium-voltage line terminal in parallel;
the system controller is connected with the power grid through a current sampling unit and a voltage sampling unit and is used for collecting the current and the voltage of the power grid;
the system controller is respectively in communication connection with the transformer substation regulation and control unit, the medium-voltage line regulation and control unit and the medium-voltage terminal regulation and control unit and is used for realizing operation regulation of the regulation and control units.
2. The medium voltage distribution network power quality control system of claim 1, wherein the system controller is comprised of a communication unit, a coordinating control unit.
3. The medium voltage distribution network power quality control system of claim 2, wherein the communication unit employs 4G/5G wireless communication to establish communication interaction of data and control commands between the system controller and other units;
and the coordination control unit performs logic analysis and system scheduling control according to the voltage and power factor data of each regulation and control unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112054517A (en) * | 2020-09-07 | 2020-12-08 | 苏州爱科赛博电源技术有限责任公司 | Medium-voltage distribution network power quality control system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112054517A (en) * | 2020-09-07 | 2020-12-08 | 苏州爱科赛博电源技术有限责任公司 | Medium-voltage distribution network power quality control system and method |
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