In electricity market, it is helpful to give reactive power a right price to stimulate enthusiasm of suppliers. In this paper, doubly-fed induction generator(DFIG) wind farm is regarded as a continuous reactive power source to participate in power system reactive power optimization. On this basis, reactive power pricing models of synchronous generator and DFIG wind farm are analyzed. Then a power system reactive power optimization model including DFIG wind farm is built up, where economic losses, including ...