说明：  电力系统风险评估程序，评估接入光伏后电力系统电压、电流越限风险，并用粒子群算法以系统风险为目标函数对光伏出力进行优化
(The power system risk assessment program evaluates the risk of voltage and current exceeding the limit of power system after photovoltaic access, and optimizes the photovoltaic output with the objective function of system risk using particle swarm optimization algorithm.)