Static var generator possessing complete active power filter (APF) function

Abstract

The present invention relates to a static var generator possessing a complete APF function. The technical characteristics are that the static var generator possessing the complete APF function comprises an RISC processor, an FPGA module, six DSPs, a SVG inverter, a PWM drive circuit of the SVG inverter, an APF inverter and a PWM drive circuit of the APF inverter; the FPGA module is connected with the RISC processor and the six DSPs separately, and all the six DSPs acquire the current of a power grid via a hall sensor, a signal adjusting circuit and an A / D conversion module, are responsible for the algorithm operation of a SVG function and the APF function and the PWM driving signal output, drive the SVG inverter and the APF inverter to work separately, and are also connected with a synchronization detection circuit and a phase-locked loop circuit separately. In order to compensate a reactive current and a harmonic current accurately and timely, the static var generator possessing the complete APF function obtains a load current reactive signal and a harmonic signal rapidly and accurately in a multi-CPU control manner to generate a corresponding compensation signal to offset the reactive power and harmonic wave in a power supply, thereby achieving the purposes of reactive compensation and harmonic cancellation.

Description

technical field [0001] The invention belongs to the technical field of var generators, in particular to a static var generator with complete APF function. Background technique [0002] In the 1980s, due to the proposal of Akagi Taifumi's instantaneous reactive power theory, the maturity of high-power semiconductor devices, and the advancement of pulse width modulation (PWM) control technology, static var generators (SVG) and active power filters ( The realization and improvement of APF) laid a theoretical and technical foundation. In recent years, due to the consideration of energy saving and environmental protection, power electronic conversion devices in the distribution network terminal power supply system have been more and more widely used, but this kind of nonlinear power conversion device often induces Harmonic and reactive current problems urgently require SVG and APF to be widely used in various fields of electric power. At present, although SVG and APF have been ...

AI Technical Summary

Problems solved by technology

At present, although SVG and APF are widely used and developed, they are used as two kinds of equipment, which not only occupy space, but also consider the matching problem of parallel use.

Images