A rectifier bridge dynamic current sharing control device and control method

Abstract

An apparatus and method for a bridge rectifier to dynamically control current sharing. The apparatus comprises a regulator (1) and at least two groups of control targets, each group of control targets comprising a bridge rectifier controller (2), a bridge rectifier (3), and a current sensor (4). The input end of the current sensor is connected to the bridge rectifier, and the output end of the current sensor is connected to the input end of the bridge rectifier controller. The regulator is connected to the bridge rectifier controller in all the control targets. The apparatus utilizes digital current sharing technology to implement the current sharing in parallel connections between bridge rectifier bridge arms and silicon controlled rectifiers.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a dynamic current sharing control device and a control method for a rectifier bridge. Background technique [0002] The excitation system is an important part of the synchronous generator. It provides DC current to the generator rotor to establish the rotor magnetic field, and adjusts the generator terminal voltage and output reactive power by adjusting the output current of the excitation system. Therefore, the performance of the excitation system directly affects the operating characteristics of the generator, and an excellent excitation system can ensure reliable and stable operation of the generator. [0003] The excitation system usually consists of three parts: adjustment, rectification and de-excitation. The rectification part is usually composed of multiple silicon controlled rectifier bridges connected in parallel. The larger the capacity of th...

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Problems solved by technology

Commonly used current sharing methods mainly focus on balancing the impedance between circuits, and are mainly realized by methods such as thyristor parameter matching, loop line equalization, and loop series reactors. Among them, thyristor parameters will change during operation, and current sharing The effect cannot be guaranteed; the equalization of the loop line can only achieve impedance matching through different cable lengths in the case of cable connection, but large-scale units are usually connected by copper bars; the loop series reactor is to install an adjustable reactance on the DC side of each rectifier bridge However, the installation is cumbersome and takes up space in the cabinet, and the circuit parameters will change during use, and need to be readjusted after a period of time

Moreover, the above-mentioned current sharing technologies can only achieve current sharing between the outputs of the rectifier bridge, and cannot achieve current sharing between the bridge arm parallel thyristors.

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