发电机是无功及电压支持服务的重要设备。在传统的电力系统体制中 ,这种服务一般是义务和免费的。在电力市场条件下 ,只有给发电机的这种服务以正确的价格信号和适当的经济补偿 ,才能有利于电力系统的安全稳定运行。分析了发电机无功出力的机会成本和容量成本 ,提出了以无功的机会成本加容量成本作为发电机无功计价的方法。并通过实例分析 ,证明其简单可行 Generators are important equipment for reactive power and voltage support services. In the traditional power system, this service is generally compulsory and free. Under the conditions of the electricity market, only this kind of service for generators will be able to benefit the safe and stable operation of the power system with correct price signals and appropriate economic compensation. The opportunity cost and capacity cost of generator reactive power output are analyzed, and the method of using reactive energy opportunity cost and capacity cost as the generator reactive power pricing method is proposed. And through example analysis, it is proved that it is simple and feasible