Abstract
In this paper, aiming at incorporating reactive power compensation functionality into the Vienna rectifiers, a modified one-cycle-control (MOCC) strategy is proposed by which the three-phase Vienna rectifier can be regulated in leading, lagging or unity power factors with near-sinusoidal input current waveform. First, a brief review of the working principle of the conventional OCC (COCC) strategy is conducted. Then, the MOCC strategy with the functionality of input current phase-shift control is discussed in detail. To mitigate input current distortion caused by the current phase-shift, a method whereby the signal of one phase current which is flowing in an uncontrollable region is injected into the other two phases’ current command signals is further presented. The constraints to the implementation of the MOCC scheme and the reactive power compensation capacity of the rectifier under MOCC control are analyzed as well. The proposed MOCC strategy is as easy to implement as the COCC strategy. Moreover, the MOCC strategy also preserves all other advantages of the COCC strategy, such as no phase-locked loop, no frame transformation and constant switching frequency. Finally, the theoretical analysis of the proposed MOCC strategy is fully verified by simulation and experimental results from a 1 kV·A three-phase Vienna rectifier prototype.
Highlights
Nowadays, power quality (PQ) is seriously influenced by increasing penetration of various power electronic devices connected to the grid
In order to reduce the impact of these PQ problems, designed static VAR compensator (SVC), static synchronous compensator (STATCOM) and active power filters (APFs) have been widely used with satisfactory performance for reactive power compensation (RPC) and harmonic current compensation (HCC)
The control strategy based on Equation (18) will enable the Vienna rectifier to operate under unity power factor exactly, which means the displacement angle of input current under the Conventional one-cycle-control (COCC) strategy will be regulated to zero
Summary
Power quality (PQ) is seriously influenced by increasing penetration of various power electronic devices connected to the grid. Incorporating RPC function into conventional unidirectional power converters means the phase angle of the input current of the converter with regard to the source voltage should be able to be shifted in leading or lagging freely. A modified one-cycle-control strategy is proposed to achieve phase shift control of the rectifier input current, which makes the Vienna rectifier be able to operate under leading, lagging or unity power factors.
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