Switching Control and Its Experimental Verification of Megawatt High-Voltage Impedance Measurement Equipment

Abstract

Megawatt high-voltage impedance measurement equipment is important for the impedance modeling of renewable energy power generation device while the control method or parameter is unknown. Smoothly cutting in/out are significant to ensure the normal operation of megawatt high-voltage impedance measurement equipment. This paper proposes a switching control method of megawatt high-voltage impedance measurement equipment through controlling the switching sequence of switches and the starting and stopping sequence of impedance measurement equipment and the measured device, which can avoid the impact on the equipment and the measured device during cutting in/out, especially the negative effects caused by inrush current. The proposed method has been applied in the developed 35kV/1MW impedance measurement equipment. When measuring the broadband impedance of the DFIG-based wind turbine in Zhangbei, the megawatt high-voltage impedance measurement equipment can be smoothly cut in/out, which verifies the effectiveness of the proposed switching control method.