Photovoltaic active power parameters optimization methodconsidering multi-scenario and parameter sensitivity

Abstract

When large-scale photovoltaic is connected to the interconnected power grid, the problem of voltage and frequency stability is prominent due to the shortage of photovoltaic active power output during low voltage fault. Firstly, this paper established the frequency response model of the combination of hydropower and photovoltaic, and theoretically analyzed the correlation between the system frequency and the key parameters of photovoltaic active power of LVRT. Then, through the normalized sensitivity index of photovoltaic parameters, it quantitatively analyzed the impact of key parameters of photovoltaic LVRT active power on transient frequency. Thirdly, based on the above normalized sensitivity, the optimization model of photovoltaic active power parameters meeting multi-scenario transient stability constraints was established with the objective of minimizing frequency deviation. Finally, the adaptability of the optimized parameters was verified through an example. With the AC line N-2 fault as an example, the minimum transient frequency is 49.5 Hz in forward mode, which increases by 1.5 Hz. Meanwhile, the maximum transient frequency is 50.4 Hz in outgoing mode. Both scenarios meet the requirements of frequency stability, which verifies that the proposed method can improve the stability of system frequency.

Keywords

• photovoltaic power generation
• sensitivity
• frequency response
• parameter optimization
• multi-scenario
• double carbon target