Method and Performance Analysis of CAP1400 Nuclear Power Unit Participating in Frequency and Voltage Regulation

With the extremely rapid development of wind power, photovoltaic and other renewable energy, the frequency modulation capability of power system has decreased significantly, and the security problem has become more and more serious. Meanwhile, the installed capacity of nuclear power units will continue to increase in the future, and the proportion of nuclear power in some provinces will exceed 30%. China’s new nuclear power units have the primary frequency regulation (PFR) function, but for safety reasons, they do not participate in the PFR of the power system, which This also weakens the system’s ability to maintain stable regulation. Based on the actual demand of power system, fully tapping into the primary frequency regulation capability of nuclear power units is of great significance for ensuring the safe and stable operation of the power system in the context of digital and intelligent new power system construction. According to the characteristics of CAP1400 unit, this paper analyzes the feasibility of participating in primary frequency regulation, secondary frequency regulation (SFR) and automatic voltage control (AVC), and puts forward a control method of energy storage cooperating with nuclear power unit participating in primary frequency regulation, which has been verified to have good frequency regulation performance.