Staggered single-cycle control complementary current generator and control method thereof

Abstract

The invention relates to a staggered single-cycle control complementary current generator and a control method thereof. The invention has the advantages of small current tracking error, high tracking speed, fixed switching frequency, and the like and remarkably decreases the ripple component of the output compensation current in a staggered ripple cancellation mode. The staggered single-cycle control complementary current generator comprises a three-phase inverter bridge I and a three-phase inverter bridge II, the output ends of the two three-phase inverter bridges I and II are respectively connected in series with a current transformer group I and a current transformer group II and then respectively connected with a three-phase inductor I and a three-phase inductor II, the output ends ofthe three-phase inductors I and II are connected in parallel and then connected with a three-phase compensated power line, the three-phase inverter bridges are respectively connected with pulse driving devices which are respectively with corresponding current detection units I and II, synchronous pulse generating units, voltage parameter arithmetic elements and instruction current arithmetic elements, the current detection units are connected with the respective current transformer groups, and the two arithmetic elements are connected with corresponding detection units.

Description

technical field [0001] The invention relates to an interleaved single-cycle control compensating current generator and a control method thereof for actively tracking and compensating harmonic currents and reactive currents in a power system. Background technique [0002] The active compensation of harmonic current and reactive current in the power system by modern power electronic technology is an important content in the flexible power transmission technology (FACTS) and consumer power technology (D-FACTS) developed in recent years. For example, parallel active power filter (APF) and static synchronous compensator (STATCOM), etc., all belong to the compensation current generator manufactured by modern power electronic technology. [0003] In order to achieve high-efficiency and high-speed compensation effects, this type of compensation current generator often uses hysteresis tracking method or PWM method to modulate and drive the inverter bridge in order to generate the req...

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Problems solved by technology

[0022] 1) The control target is too single to meet the diverse actual compensation needs;

[0023] 2) If the power supply voltage waveform is distorted, the compensated current waveform will also be distorted in the same way;

[0024] 3) The high-frequency ripple component in the compensation current will significantly affect the control accuracy;

[0025] 4) The single-cycle control method is used to explore the current tracking control, the control equation is incorrect, the control effect is poor, and it cannot meet the practical requirements

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