At present

capacitive reactive power reversal is becoming increasingly prominent in the period of light load in large urban network

which endangers the safe and stable operation of power grid. In this context

the reactive power planning method of distribution network considering power factor constraints is studied.First

the integrated reactive power planning model considering the power factor constraints and containing reactor and capacitor is set up. The simultaneous allocation of capacitor and reactor in the distribution system is considered in the model so to plan the minimum sum of the investment of reactive power compensation equipment and the cost of active power loss as objective function. The node power factor constraints are added in constraints. Then

the calculation formula of sensitivity of power factor to the reactive power is derived.An improved genetic algorithm based on power factor sensitivity is used to solve the established model.The coordination and optimization of capacity location selection of inductive and capacitive reactive power compensation equipment of the distribution network is performed. And the obtained optimization scheme can solve such problem as reactive power reversal and out of limit of power factor in low load during the cable development process in the distribution network. Finally

the effectiveness of the model and the algorithm of the model is verified by the example of typical high voltage distribution network.