Thyristor control series compensation control method for low-voltage power distribution network

Abstract

The invention relates to a thyristor control series compensation control method for a low-voltage power distribution network, and belongs to the field of power systems. The method comprises the following steps: S1, building an LD-TCSC topological structure; s2, taking a thyristor delay trigger angle as a main control variable, and constructing an equivalent mathematical model of LD-TCSC output capacitive reactance, resistance and harmonic voltage; s3, establishing a control optimization model by taking the minimum active power loss of the power grid as a target and taking power conservation, voltage reliability and the like as constraint conditions, solving the problems of voltage distribution and loss suppression of the power distribution network by utilizing the optimal power flow, and carrying out equipment output driving; and S4, establishing an on-line mode depending on the real-time data and an off-line mode depending on the historical data by utilizing the operation data near the installation node and taking whether the global operation data of the power grid can be effectively obtained as a criterion, and a control method of the on-line mode and off-line mode.

Description

technical field [0001] The invention belongs to the field of power systems, and relates to a thyristor-controlled series compensation control method for a low-voltage distribution network. Background technique [0002] The low-voltage power distribution network is located at the end of the system. Its grid structure is weak, the line is long, the line path is small, and the load increases rapidly, which often leads to serious voltage drop. In order to solve the low-voltage problem in the low-voltage distribution network, power system engineers usually use adjustment Transformer transformation ratio, strengthen network construction, increase power equipment and other measures. Installing uninterruptible power supply (UPS), static var compensator (SVC) and other power equipment is the most efficient, cheapest and most widely used means of voltage improvement. Frequent switching operations and other problems. In order to solve the problem of concentrated voltage improvement u...

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Problems solved by technology

[0003] At present, many researches on the application of thyristor-controlled series compensation technology in high-voltage transmission network or medium-voltage distribution network have been carried out in China. However, in view of the particularity of LD-TCSC, the existing control methods and theories cannot be directly applied to LD-TCSC. It is mainly reflected in the following two aspects: 1) TCSC in medium and high voltage lines only considers the equivalent capacitive reactance or inductive reactance output, and the equivalent resistance and equivalent harmonic voltage accompanying the output are small and negligible compared with the line operating parameters , however, the resistance and harmonic voltage output of the LD-TCSC must be considered

2) Under the condition that the topological structure of the low-voltage distribution network is very complex, it is difficult for LD-TCSC to effectively control the low-voltage problem of the distribution network only by relying on the operating data near the installation node and the existing single-objective control method

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