Intelligent comprehensive power distribution device applied to low-voltage transformer district and method thereof

A power distribution device and low-voltage transformer technology, applied in circuit devices, electrical components, AC network circuits, etc., can solve the problems of system reactive power compensation, increase in system size, and high technical requirements, so as to reduce system costs and improve service life. , the effect of simple connection

Inactive Publication Date: 2020-03-31
BENXI POWER SUPPLY COMPANY OF STATE GRID LIAONINGELECTRIC POWER SUPPLY +3
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Problems solved by technology

However, when the capacity is large, the structure is complicated, the technical requirements are high, and the cost is high
[0007] To sum up, some of the common reactive power compensation devices on the market cannot compensate the reactive power of the system while adjusting the three-phase unbalance. , the cost will be very high

Method used

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  • Intelligent comprehensive power distribution device applied to low-voltage transformer district and method thereof
  • Intelligent comprehensive power distribution device applied to low-voltage transformer district and method thereof
  • Intelligent comprehensive power distribution device applied to low-voltage transformer district and method thereof

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Embodiment Construction

[0036] figure 1 It shows a structural diagram of a specific implementation of an intelligent integrated power distribution device and its method applied in a low-voltage substation area. The device in this embodiment includes SVG, an intelligent capacitor bank, and other switching circuits, control loops, and communication loops. SVG Connected in parallel to the power supply busbar of the distribution network, it can adjust the unbalanced three-phase load, and at the same time adjust the reactive power dynamically, bidirectionally and continuously; the smart capacitor bank is connected in parallel to the power supply busbar of the distribution network, which can adjust the unbalanced three-phase load, Compensation of reactive power: SVG and smart capacitors coordinate and cooperate to complete the reactive power compensation of three-phase unbalanced loads, thereby improving the power quality of the distribution network and reducing system costs.

[0037] Such as figure 1 As ...

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Abstract

The invention discloses a device and a method for reactive compensation and three-phase imbalance hybrid compensation of a power distribution area. The device is connected to a power supply busbar ofa power distribution network in parallel, comprises an SVG, an intelligent capacitor bank, other switching circuits and a control loop, and is used for carrying out hybrid compensation on three-phaseimbalance and reactive power of the power distribution network, so that the electric energy quality of the power distribution network is improved, and the system cost is reduced. Various problems faced by other compensation devices on the market can be solved, three-phase load imbalance is adjusted, and meanwhile reactive power is dynamically, bidirectionally and continuously adjusted; the controlunit of the SVG is used for preferentially switching the intelligent capacitor, so that the control precision and speed are improved; the SVG is used for fine compensation, so that the compensation precision is improved, the frequent switching of the intelligent capacitor is avoided, and the service life of the capacitor is prolonged; the intelligent capacitor and the SVG are complementary and can be applied to high-power occasions, the system size is reduced, and the system cost is reduced.

Description

technical field [0001] The invention relates to the field of power supply and distribution, in particular to an intelligent integrated power distribution device and method applied in a low-voltage substation area. Background technique [0002] The low-voltage station area refers to the low-voltage (0.4kV) power supply area affected by the 35 (10) kV / 0.4kV distribution transformer. The electricity used in the Taiwan area is generally used by residents, and its quality directly affects the lives of residents. At the same time, more and more distributed power sources are connected to the distribution network, which brings power quality problems such as voltage deviation, three-phase imbalance, and abnormal power factor at the assessment point to the distribution network. When the system is in a three-phase unbalanced state, the negative-sequence component may cause problems such as relay protection device malfunction, negative-sequence and zero-sequence currents to generate ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/26
CPCH02J3/1864H02J3/26Y02E40/10Y02E40/50
Inventor 蒋向东王玲赵庆源苏宗昱李涛刘子洋徐晓岑郑永健闫春生黄川白挺玮薛思萌孙宏伟顾维菱李志国黄晓辉
Owner BENXI POWER SUPPLY COMPANY OF STATE GRID LIAONINGELECTRIC POWER SUPPLY
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