Fast Detection of Short-Duration Grid Voltage RMS Variation for Compensation Applications

To prevent sensitive loads from short-duration grid voltage root-mean-square (RMS) variation, the dynamic voltage restorer (DVR), a cost-effective solution widely used in practice, is required to compensate the load voltage as fast as possible; moreover, for many sensitive loads, the requirement on the full response time for the DVR has become even stricter nowadays. Thus, in this paper, a fast detection method for short-duration grid voltage RMS variation is proposed to accelerate the response of the DVR based on 4 approaches, achieving low time delay less than 1ms in most cases even for the grid voltage with distortions. Simulations and sufficient experiments verified the feasibility and the performance of the proposed method.