JPH0196741U

JPH0196741U -

Info

Publication number: JPH0196741U
Application number: JP19123987U
Authority: JP
Priority date: 1987-12-16
Filing date: 1987-12-16
Publication date: 1989-06-27

Description

[Brief explanation of the drawing]

第１図は本考案にかかる高調波補償装置の一実
施例の制御装置のブロツク図、第２図はこの種高
調波補償装置を具えた３相交流電源系統の主回路
接続図、第３図は高調波補償時の系統のブロツク
図である。１……３相交流系統電源、２……負荷、３……
系統インピーダンス、４……交流リアクトル、５
……３相ＰＷＭコンバータ、６……直流コンデン
サ、７……高次１次形フイルタ、１１，２１……
電力演算回路、１２，２２……ハイパスフイルタ
、１３，２３……符号反転回路、１４，２４……
電力指令演算回路、１５……電流制御回路、２５
……実効値演算回路、２６……ゲイン選択回路、
２７……比例微分回路、２８……加算回路。 Fig. 1 is a block diagram of a control device of an embodiment of the harmonic compensator according to the present invention, Fig. 2 is a main circuit connection diagram of a three-phase AC power supply system equipped with this kind of harmonic compensator, and Fig. 3 is a block diagram of the system during harmonic compensation. 1... 3-phase AC power supply, 2... Load, 3...
System impedance, 4...AC reactor, 5
...Three-phase PWM converter, 6...DC capacitor, 7...High-order primary filter, 11, 21...
Power calculation circuit, 12, 22... High pass filter, 13, 23... Sign inversion circuit, 14, 24...
Power command calculation circuit, 15...Current control circuit, 25
... Effective value calculation circuit, 26 ... Gain selection circuit,
27... Proportional differentiation circuit, 28... Addition circuit.

Claims

[Scope of utility model registration request]

A harmonic compensation device provided in a system line between a power supply system and load equipment, comprising a three-phase PWM converter, an AC reactor connected in series to the system line on each AC side phase of the three-phase PWM converter, and the a DC capacitor connected between the DC side terminals of the three-phase PWM converter, and a high-order primary filter installed on the power supply side of the AC reactor;
In the control device for controlling the three-phase PWM converter, the control device includes means for calculating the instantaneous imaginary power and real power of the load equipment to generate the first current command signal, and a means for generating the first current command signal from the power supply current. means for calculating AC components of imaginary power and real power; means for calculating effective harmonic values from the instantaneous imaginary power of the power source current and AC components of real power; and means for selecting a gain from the effective harmonic values; means for calculating an imaginary power command and a real power command by inverting the signs of the instantaneous imaginary power of the power supply current and the alternating current components of the real power;
means for generating a second current command signal from the imaginary power command and the real power command; means for inputting the second current command signal and the gain to generate a third current command signal; the current command signal and the first
means for obtaining a current command signal by adding the current command signals of the AC reactor; A harmonic compensator characterized by comprising means for generating harmonics.