A parallel operation controller for static var generator and its control method

Abstract

The invention belongs to the field of power electronic control, and particularly relates to a parallel run controller for static idle generating devices. The parallel run controller comprises a backing plate, wherein the backing plate is provided with a plurality of connectors; a main control panel is connected on the backing plate through the connector and is used for editing and sending synchronization and coordination signals to various controlled equipments, so as to control the controlled equipments to generate a phase difference of the synchronization and coordination; a communication plate is connected on the backing plate through the connector and is connected with various controlled equipments, and the communication plate is connected with the main control panel through a data base based on an FPGA (Field Programmable Gate Array); the backing plate is further connected with a power supply plate through a connector, the power supply plate is connected with a power grid and powers the main control plate and the communication plate. The parallel run controller provided by the invention can control a plurality of low voltage static idle generating devices, therefore the parallel connection of the plurality of idle generating devices becomes possible; furthermore, the ripple current can be effectively inhibited, and the conducted interference of the system can be reduced.

Description

technical field [0001] The invention belongs to the field of power electronic control, in particular to a parallel operation controller used for static var generators. Background technique [0002] At present, the SVG low-voltage static var generator composed of power electronic converters, due to the limitation of volume and heat dissipation, the power capacity of a single device is generally below 300kvar, and it is used in the working environment with large transformer capacity. The capacity of one set cannot meet the capacity demand of reactive power compensation, so it is necessary to use multiple SVG devices to run in parallel to provide sufficient capacity. Since each SVG device has its own complete set of detection and control systems, in the absence of communication with each other, the distribution of the output current of each machine can only be realized by setting the output percentage on the control interface of each machine. Under certain circumstances, the o...

AI Technical Summary

Problems solved by technology

Parallel SVG equipment has its own independent control system, so the phase difference between the carrier waves of each equipment is random, which leads to the random phase difference between the ripple currents sent by each machine, and various The superposition of machine ripple, and the ripple current will increase the conduction interference of the system due to its high frequency, and cause adverse effects on other equipment in the power grid.

This problem limits the number of parallel SVG devices in the same system, reducing the reliability and safety of the device

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