Chained SVG control system and control method

Abstract

The invention discloses a chained SVG control system and a chained SVG control method. The system comprises an inner ring control part and an outer control part, wherein the inner ring control part is composed of an AD data sampling module, an inner ring data conversion module, a current inner ring control module and a feedforward computing module connected in sequence, and controlled by a field-programmable gate array (FPGA); the outer ring control part is composed of an outer ring data reading module, an outer ring data conversion module connected with the outer ring data reading module, an outer ring control algorithm module connected with the outer ring data conversion module, and a phase-locked loop SPLL module, and controlled by a digital signal processor (DSP); the inner ring control part and the outer ring control part adopt DSP+FPGA heterogeneous multiprocessors for controlling in parallel, and the system performance is maximally enhanced.

Description

technical field [0001] The invention relates to the technical field of chained SVG control, in particular to a chained SVG control system and a control method. Background technique [0002] With the rapid development of the economy, large-capacity inductive loads, power electronic equipment, and high-power nonlinear loads (such as electrified locomotives, rolling mills, electric arc furnaces, ferrosilicon furnaces, etc.) in the power system are gradually increasing. The impact of these equipment on the power grid Harmonic pollution is on the rise, and the power quality problem of the power grid is becoming increasingly prominent. [0003] Static var generator (SVG), as an important device under the flexible AC transmission technology, is the most superior static var compensation equipment so far and has attracted widespread attention. Among them, chained SVG has become a research hotspot, because chained SVG reduces output harmonics and switching frequency through multi-lev...

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Problems solved by technology

[0004] The existing SVG controller has insufficient control ability, resulting in poor dynamic response of the system, poor current waveform control ability and large harmonic distortion rate, which cannot fully utilize the performance characteristics of chained SVG multi-level low current harmonic distortion rate and high dynamic response , is not conducive to the adjustment and control of reactive power, and at the same time leads to a large requirement for the connection inductance value, which increases the cost, increases the probability of equipment and system resonance, and reduces reliability and applicability. Therefore, it is necessary to solve the above problems

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