A Calculation Of Energy Losses With Consideration Of Corona Losses And Harmonic Energy Losses In 500kV Grids

Energy losses are an important technical and economical index in power systems, with the 500kV systems becoming the main grids in our country, it is necessary to study the operating features of the 500kV grids and improve the calculation of energy losses. Some research works in this respect are studied in this paper as follows:In part one, the base and the peculiarity of calculating energy losses in 500kV network are introduced. In 500kV network, the calculating of energy losses is based on electricity quantities flow, and three aspects ought to be considered, including distribution feature of long line; corona losses of lines; harmonic energy losses.In part two, the method of computing energy losses in 500kV grids considering the corona losses of lines are studied. First, the design of BP network for calculation corona losses of transmission line in 500KV network is introduced. Then a calculation method of energy losses in consideration of corona losses was presented.In part three a decoupled algorithm for power system harmonic flows was introduced; and a computation mode is established for calculating energy losses, including harmonic energy losses.In part four, based on the above researches, a calculation method was proposed with consideration of the losses caused by corona and harmonic in 500KV network. The computed results shows that under bad weather condition (such as rainy days), if neglecting corona losses the errors are greater, while the effectiveness from harmonic is relatively small in 500KV network.