In view of such problem as unable start of pump load due to excessive low voltage at the feeder which frequently occurs under the low voltage distribution network with such agriculture load as oxygen pumps and water pumps as foundation

in this paper

the optimal allocation model of distributed reactive power compensation of low voltage distribution network with consideration of pump load character is proposed. In the model

both investment cost and economic efficiency reducing network loss of the compensation device is comprehensively considered in the objective function. And the constraint condition includes various constraints of the pump load at the distribution area under normal operation and starting condition.The discontinuous symbol function in the approximation objective function of sigmoid function is adopted and non-linear penalty function near the discrete value with curvature is adopted to proceed the discrete variable feature of the reactive power compensation capacity

thus primal-dual interior point algorithm is adopted further to solve the optimization model. It is verified by the calculation and analysis of certain actual low voltage distribution that the compensation scheme obtained by the method can be able to improve the voltage quality of distribution area

assure normal start of pump load and reduce effectively the network loss of the area.