Transactions of China Electrotechnical Society  2021, Vol. 36 Issue (zk1): 126-132    DOI: 10.19595/j.cnki.1000-6753.tces.L90165
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Switching Strategy with the Improved Single-Phase dq0 Voltage Detection Method for the Load Voltage Compensation Unit of Hybrid Distribution Transformer
Cai Shengliang1, 2, Liang Deliang1, 2, Zhou Kun1, 2, Zhang Lishi1, 2, Liu Yibin1, 2
1. State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'an 710049 China;
2. Shaanxi Key Laboratory of Smart Grid Xi'an Jiaotong University Xi'an 710049 China;

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Abstract  The load voltage compensation unit of hybrid distribution transformer (HDT) should be switched on or off with the variable conditions of the distribution network. To improve the limitations of the existing voltage detection methods, this paper proposes an novel detection method with improved dq0 transformation method. Specifically, the three-phase virtual voltages for each phase grid voltage are built by the method of derivation, and these virtual voltages are transformed from the static coordinate to the dq0 coordinate, then the three phase voltage swell, sag and asymmetry can be detected by the simple comparing method. The advantage of this novel detection method is that just a low pass filter with small time constant is adopted to eliminate the high order harmonics, then the low pass filter with long delay used in the traditional methods can be cancelled, thus both the detection response and accuracy of the novel method are improved. The simulation model is built in Matlab/ Simulink, the load voltage compensation unit can be switched on or off by the generated detection signal with reverse parallel thyristors, which verifies the correctness of the proposed method.
Key wordsHybrid distribution transformer      voltage detection      derivative construction method      load voltage control unit switching strategy     
Received: 30 June 2020     
PACS: TM421  
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Cai Shengliang
Liang Deliang
Zhou Kun
Zhang Lishi
Liu Yibin
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Cai Shengliang,Liang Deliang,Zhou Kun等. Switching Strategy with the Improved Single-Phase dq0 Voltage Detection Method for the Load Voltage Compensation Unit of Hybrid Distribution Transformer[J]. Transactions of China Electrotechnical Society, 2021, 36(zk1): 126-132.
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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L90165     OR     https://dgjsxb.ces-transaction.com/EN/Y2021/V36/Izk1/126
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