Design and implementation of AGC/AVC multi-mode automatic control system for large-scale grid-connected photovoltaic power station

Under the background of “carbon peak and carbon neutral”, the restructuring and transformation of energy pattern are inevitable. According to the 14 th Five-Year Plan, the consumption of wind power and photovoltaic non-petrochemical energy will account for 25% by 2030. The demand for automatic control system of new energy power stations will be in the outbreak stage, and AGC/AVC is the guarantee of the quality, safety and economic operation of the whole power grid. Research and development of adaptive, multi-strategy high precision AGC/AVC system has become the goal of change. Combining with the characteristics of volatility and instability of photovoltaic power station, comprehensively considering of the demand of the grid and power generation enterprises, a large grid photovoltaic power station, multi-mode hybrid control strategy and regulation mode of AGC/AVC automatic control system is designed, including the system of physical architecture, data acquisition and data processing and implementation. The system is a control algorithm based on mathematical model. According to the setting of automatic regulation rules of system parameter changes, and combining with the idea of power distribution, various adaptive control modes such as AGC average calculation strategy, AGC average strategy with priority, AVC average calculation strategy with priority, AVC reactive compensation device and inverter mixed strategy are proposed. By comparing the real-time data with the target curve delivered by the dispatching terminal,the active power and reactive voltage of the photovoltaic power station are regulated, the target power is allocated according to the dispatching, and the active power of the dispatching power unit inverter is allocated according to the optimal combination strategy, so as to achieve the effect of batch regulation and fine tuning, control the intelligent adjustment precision. The system has strong robustness. In the escort for the power grid safe and reliable operation at the same time, it realizes the unattended photovoltaic power station, the operation mode of the less people on duty, reduces operating costs, improves the quality of photovoltaic power generation system, reliable and economic operation.