35 kV direct-hanging SVG system and PLC logic control method thereof

Abstract

The invention discloses a 35 kV direct-hanging SVG system and a PLC logic control method thereof. The control system uses a method of configuration monitoring + PLC+ controller. The configuration monitoring is mainly responsible for issuing various control parameters, whole machine protection set values, and displaying operation states and faults. The PLC is mainly responsible for whole machine operation flow. The main controller uses DSP adding FPGA architecture. The 35 kV direct-hanging SVG does not need a step-down transformer, and is directly hung on a 35 kV power grid. The system can adapt to hundred-trillion-level fast dynamic compensation of a power grid, adjusts voltage of a long-distance transmission line, reduces power transmission loss, improves transmission capacity, and improves transient voltage maintenance level. The system can be widely used in wind power stations, photovoltaic power stations, etc.

Description

technical field [0001] The invention relates to a large-capacity static var compensator, in particular to a 35kV direct-hanging SVG system and a PLC logic control method thereof. Background technique [0002] In the construction and operation of my country's power grid, a long-standing problem is insufficient reactive power compensation capacity and unreasonable equipment, especially the insufficient adjustable reactive power capacity, and there are fewer reactive power adjustment equipment with fast response. [0003] In recent years, with the rapid economic growth, my country's power grid has the following characteristics: generators are basically at full power, making dynamic reactive power support increasingly insufficient; with economic growth and high-tech development, constant power loads are increasing year by year; Air-conditioning, heating and other types of sudden loads account for an increasing proportion, peaking at more than 40%, and conventional capacitor compe...

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Problems solved by technology

[0006] However, SVC has the following disadvantages: 1. The response time of SVC is 10-40ms, which is longer; 2. The compensation capacity is determined by the capacitor capacity and reactor capacity, which is narrow; 3. SVC itself is a harmonic source, which will generate Harmonics are very difficult to eliminate; 4. Since SVC uses high-voltage and large-capacity capacitors and reactors as energy storage components, it occupies a large area; 5. Due to the use of high-voltage and large-capacity capacitors and reactors, the power consumption is relatively high

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