| A 30 MW water-turbine generator set in Wujiangdu singly supplies power to three ferroalloy factories, which forms the operation mode of single-machine network. In the operation process, a series of problems occur such as active power declining, low power factor, frequency regulation fails and seriously low-level voltage. This paper firstly analyses the characteristics of many smelting electric furnaces and power transforms, and figures out that the main reason of occurring problems is lack of reactive power. At the same time, the paper estimates the number of reactive power lack, and preliminarily proposes various schemes of the reactive power compensation, which includes the location, capacity, manner, and so on. Then Power System Analysis Software Package (PSASP) is used to simulate the operating of the single-generator network on the conditions of pre- and post-compensation, and the simulation results involve voltage level, power factor and power loss. Considering the technology feasibility, economical efficiency and power network status quo, the paper chooses an appropriate var compensation scheme, which is to parallel capacitor bank on the bus bar of smelting- electric-furnace transform, and the paper also provides the corresponding values of the capacitor and the reactor. The var compensation scheme has been implemented. The field tests indicate that the network voltage come back to the rated voltage value basically, the active power and power factor of the generator is increased, and the efficiency of the power plant and the economic benefits of the ferroalloy factories are all obvious improved. Therefore, the selection and implementation of var compensation scheme have gained favorable technical and economy effect on the equipment safety operation and the ferroalloy product quality in the Wu Jiangdu single machine grid.
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