A TCR static passive compensation device with T active power filter structure

Abstract

The invention discloses a design of a TCR static var compensator (SVC) provided with a T-shaped active power filter (APF) and a control method thereof. The var compensator adopts a hybrid SVC composed of the T-shaped active power filter and an SVC and is connected with a power factor corrector of a small-sized voltage source inverter type (PFC-VSI). A harmonic compensation control loop of the APF part in the device consists of two parts, namely, a direct feedback control loop and a feedforward system; the active power filter part of the system consists of a capacitor Cf, an inductor Lf and an APF-VSI connected with the inductor Lf in parallel. The TCR part is mainly applied in absorbing harmonic current and adjusting reactive power. For the T-shaped active power filter is adopted, the inductor Lt of the TCR branch has high resistance during ultraharmonics and can naturally filter part ultraharmonics. Compared with the prior harmonic filter different from the harmonic filter provided by the invention which works together with the voltage source inverter of low bandwidth, and therefore the control of the system is simpler than common harmonic filters and not affected by the inherent delay of one period when DSP is executed.

Description

technical field [0001] The invention belongs to the static var compensation device (SVC) technology in the electric power system, and specifically relates to a design method and a control method of a static var compensation device with a T-type active filter structure, especially the T Type active filter, it can be used in reactive power compensation devices in today's new distribution network. Background technique [0002] Modern society is increasingly inseparable from power supply from large-scale industrial production to daily life. In addition to the exponential increase in demand for electric energy, more and more users and electrical equipment are more concerned about the quality of the power supply grid, the form of electric energy used, and the flow of power. Newer and higher requirements are put forward for the control and processing of the system. Reactive power balance is very important to improve the economic benefit of power grid and improve the quality of pow...

AI Technical Summary

Problems solved by technology

As a result, a series of problems have arisen: the formation of ultra-high-voltage large power grids and the intensification of load changes require a large number of fast-responding adjustable reactive power sources to adjust voltage, maintain system reactive power flow balance, reduce losses, and improve power supply reliability

However, some of these issues must be paid attention to, such as current measurement, generation of reference current, control system design to enable fast response of hybrid SVC

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