A switching control method for high-voltage and large-capacity impedance measurement equipment

Abstract

The invention discloses a switching control method for high-voltage large-capacity impedance measurement equipment. The high-voltage large-capacity impedance measurement equipment mainly includes a high-voltage large-capacity broadband voltage disturbance injection device, a signal processing unit, a broadband impedance calculation and monitoring unit, and a control unit. unit. Among them, the output of the high-voltage large-capacity broadband voltage disturbance injection device is connected in series to the high-voltage line of the new energy power generation equipment to be tested through a coupling transformer to provide a voltage disturbance source. The input and removal of the high-voltage large-capacity broadband voltage disturbance injection device are directly related to the safe and stable operation of the equipment under test, the voltage disturbance injection device itself and the power grid. A switching control method for high-voltage large-capacity impedance measurement equipment provides a soft switching control method for its high-voltage large-capacity broadband voltage disturbance injection device. During the switching process of the high-voltage large-capacity broadband voltage disturbance injection device. Impact on the equipment under test, the voltage disturbance injection device itself and the power grid. It can provide technical support for online measurement of broadband output impedance in high-voltage and large-capacity scenarios such as wind power generation.

Description

technical field [0001] The invention relates to the technical field of online impedance measurement in new energy power generation, in particular to a switching control method for high-voltage and large-capacity impedance measurement equipment. Background technique [0002] Vigorously developing renewable energy is an important measure for my country to ensure energy security and respond to climate change. Wind power and photovoltaic power generation are the main methods of renewable energy utilization in my country. In the "Three North" regions, build 10 million-kilowatt-level wind power / photovoltaic bases and utilize UHV DC transmission is the dominant form of renewable energy development and utilization in my country. In the DC transmission system of renewable energy power generation bases, the number of power electronic power generation equipment is huge, the control is complex, and there are multi-time scale couplings. The dynamic interaction between bases and DC transmi...

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Problems solved by technology

[0004] However, the current research on impedance measurement equipment is mainly concentrated in the low-voltage and small-capacity field, and the research on high-voltage and large-capacity impedance measurement equipment is still in its infancy, and the research is not perfect enough.

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