基于改进单相dq0电压检测的混合式配电变压器负载电压控制投切策略  

Switching Strategy with the Improved Single-Phase dq0 Voltage Detection Method for the Load Voltage Compensation Unit of Hybrid Distribution Transformer

作　　者：蔡生亮 梁得亮[1,2] 周堃 张立石 柳轶彬 Cai Shengliang;Liang Deliang;Zhou Kun;Zhang Lishi;Liu Yibin(State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University ,Xi’an 710049 China;Shaanxi Key Laboratory of Smart Grid Xi’an Jiaotong University, Xi’an 710049 China)

机构地区：[1]电力设备与电气绝缘国家重点实验室(西安交通大学),西安710049 [2]西安交通大学陕西省智能电网重点实验室,西安710049

出　　处：《电工技术学报》2021年第S01期126-132,共7页Transactions of China Electrotechnical Society

基　　金：陕西省2018年重点研发计划资助项目(2018ZDCXL-GY-07-05)。

摘　　要：混合式配电变压器(HDT)负载电压补偿回路需要根据配电网的电压状况进行投入与切除。因为现有的电压突升突降的检测算法的局限性,该文提出一种改进的dq0变换检测算法。具体而言,通过求导法对每相电压构造虚拟三相电压,然后对三组虚拟三相电压进行dq0变换。最后通过简单的逻辑判断,实现电网中常见的三相电压跌落、三相电压突升、单相电压突降等状况的检测。该算法的优势在于,只需加入时间常数较小的滤波器滤除高次谐波,有效避免了传统检测算法中滤波器时间常数较大带来的延时,从而提高了检测的实时性与准确性。在Matlab/Simulink中搭建仿真模型,根据检测信号进行负载电压补偿回路的投入与切除,从而验证了改进检测算法的正确性。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.

关 键 词：混合式配电变压器 电压检测 导数构造法 负载电压投切控制 

分 类 号：TM421[电气工程—电器]