RESEARCH ON DYNAMIC RESPONSE CHARACTERISTICS OF PHOTOVOLTAIC DC BOOST COLLECTION SYSTEM

With flexible power transmission capacity, photovoltaic DC boost collection system has become an effective solution to building energy interconnection between large-scale photovoltaic renewable energy and AC power grid. In this paper, the DC boost collection technology is used as a breakthrough, and RTDS real-time simulation is used as a hardware tool to deeply study the dynamic operation characteristics, mathematical model principle and whole distribution network coordinated control strategy of the system. By building photovoltaic DC-DC and DC-AC structure simulation model basing on MMC structure, the dynamic response characteristics of each part are compared and analyzed, the accuracy of the model and response is also verified. Meanwhile, based on the actual control system device, the hardware in the loop simulation test environment is constructed with RTDS simulation system. Given the step response under the same condition, the adjustment time under the dynamic response is tested to meet the design requirements.