Photovoltaic microgrid inverter synchronous control device with decision maker and its control method

Abstract

The invention provides a photovoltaic microgrid inverter synchronous control device with a decision maker and a control method thereof, which belongs to the technical field of microgrid control. The control device is characterized in that the control device comprises a wireless standard time base circuit, and the output end of the wireless standard time base circuit is connected with the communication interface of a main control circuit. The control method comprises the steps that a wireless second base clock controller in a DSP main controller is used to generate a global synchronization time setting signal to adjust a triangular wave clock signal. The problem that controller output pulse cannot be instantaneously synchronized due to controller clock frequency difference is effectively solved. According to the invention, a decision compensation controller is used to evaluate fed back frequency and phase error to predict the adjustment trend of the frequency and phase of the output voltage of an inverter to acquire a control policy; fast synchronization of the output voltage of the inverter is realized; dynamic synchronization of the output voltage of different photovoltaic inverters distributed in a microgrid is realized; and transient circulation is restrained to promote stable and efficient operation of the microgrid.

Description

technical field [0001] The invention belongs to the technical field of micro-grid control, and in particular relates to a photovoltaic micro-grid inverter synchronous control device with a decision maker and a control method thereof. Background technique [0002] In recent years, with the development of the photovoltaic industry, the scale of the photovoltaic power generation market has continued to expand, and its advantages of clean and renewable, convenient construction and maintenance have gradually emerged. Photovoltaic energy is widely distributed and locally available. Photovoltaic power generation devices are distributed geographically. As the interface of photovoltaic power generation devices, inverters are connected to photovoltaic power generation devices on site, and they also present the characteristics of distributed existence in space. In order to provide users with high-quality and high-reliability electric energy, photovoltaic inverters are mostly connected ...

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Problems solved by technology

The present invention utilizes the wireless second base clock controller in the DSP main controller to generate a global synchronous time synchronization signal, adjusts the triangular wave clock signal, and effectively solves the problem that the output pulse of the controller cannot be instantaneously synchronized caused by the difference in the clock frequency of the controller In addition, the present invention utilizes the decision-making compensation controller in the DSP main controller to evaluate the frequency and phase error of the feedback, predict the adjustment trend of the frequency of the inverter output voltage and the phase of the output voltage, and obtain optimized and fast control strategy to achieve fast synchronization of inverter output voltages, to achieve dynamic synchronization of output voltages of different photovoltaic inverters distributed in the microgrid, to suppress instantaneous circulation, and to promote stable and efficient operation of microgrids

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