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A Method for Power Electronic Transformer to Reduce Voltage Unbalance of Distribution Network

A technology of voltage imbalance and power electronics, which is applied in the direction of eliminating/reducing asymmetry in multi-phase networks and reducing the asymmetry of multi-phase networks, and can solve problems such as poor reliability, high commutation costs, and unsatisfactory actual results.

Inactive Publication Date: 2020-08-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the randomness of load use, manual commutation adjustment is lagging and inaccurate, and the actual effect is not ideal; and although the commutation switch composed of thyristors can quickly and safely commutate phases, it needs to design complex driving devices, and the commutation cost too high
This method can only achieve temporary three-phase balance, and the commutation process may cause important loads to be powered off, so the reliability is too poor
Generally speaking, there is currently a lack of an economical, accurate and reliable solution to the problem of reducing the voltage imbalance of the distribution network.

Method used

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  • A Method for Power Electronic Transformer to Reduce Voltage Unbalance of Distribution Network
  • A Method for Power Electronic Transformer to Reduce Voltage Unbalance of Distribution Network
  • A Method for Power Electronic Transformer to Reduce Voltage Unbalance of Distribution Network

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Embodiment Construction

[0061] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0062] The method of using power electronic transformers to reduce the voltage unbalance of power distribution network proposed by the present invention is aimed at the AC-DC hybrid power distribution network formed based on power electronic transformers, in which the DC network can provide energy support for the AC network, considering the power electronics For the controllability of the transformer port, an optimized mathematical model is established on this basis, and the optimal calculation is carried out with the minimum of the square sum of the negative sequence voltage and zero sequence voltage of each node of the AC network as the objective function, so that the port control value of the power electronic transformer can be solved . The flow chart of the power electronic transformer of the present invention to reduce the voltage unbalance degree ...

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Abstract

The invention discloses a method for reducing voltage unbalance of a distribution network by use of a power electronic transformer in the technical field of voltage unbalance of the distribution network. According to the method, an optimization model is established by collecting operation parameters of an AC / DC hybrid distribution network containing the power electronic transformer, and the minimum of the sum of squares of negative sequence voltage and zero sequence voltage of each node of the AC network is taken as a target function for optimizing calculation, so that the port control value of the power electronic transformer is solved. As for the AC / DC hybrid distribution network formed by the power electronic transformer, the DC network can provide energy support for the AC network. Reduction of the voltage unbalance of all nodes of the AC network is taken as a target, and besides, negative sequence voltage and zero sequence voltage are considered, so that the unbalance of the negative sequence voltage and zero sequence voltage can be reduced, and voltage unbalance of multiple nodes can be comprehensively inhibited. Compared with existing methods for reducing the voltage unbalance, the method is more economical, accurate and reliable.

Description

technical field [0001] The invention belongs to the technical field of reducing the voltage unbalance degree of a power distribution network, and in particular relates to a method for reducing the voltage unbalance degree of a power distribution network by a power electronic transformer. Background technique [0002] The low-voltage distribution network usually adopts a four-wire power supply mode. Single-phase and three-phase loads coexist, and the problem of three-phase imbalance will be unavoidable. The connection of unbalanced loads will lead to three-phase voltage imbalance, which will adversely affect the safety and efficiency of the power grid. . An unbalanced power distribution system will generate more losses and thermal effects, and unbalanced three-phase voltage will also negatively affect or even harm equipment such as induction motors, power electronic converters, and variable speed drives. In addition, the negative sequence current generated by the three-phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26
CPCH02J3/26Y02E40/50
Inventor 董雷张涛孙英云陈乃仕蒲天骄柳丹
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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