一种分布式潮流控制方法研究

Study on a new distributed power flow control method

将用于统一潮流控制器串并联变流器间有功功率交换的公用直流电容去掉,在串联侧采用分布式串联补偿技术,形成一种分布式潮流控制方法。根据不同频率分量叉乘的积分为零,不同频率下的有功功率彼此独立的特性,得出变流器吸收某个频率的功率,可以发出等量的其他频率功率的结论。基于该结论,使用在三相系统中彼此独立的3次谐波,通过输电线路取代被去掉的公用直流电容实现该分布式潮流控制器串并联变流器间有功功率的交换。仿真结果表明:该装置不仅具有统一潮流控制器的所有功能,而且由于串并联变流器的彼此独立及串联侧多个变流器的使用,提高了装置的可靠性、降低了装置的成本。

This paper deletes the common DC capacitor between two voltage source converters of the unified power flow controller, and the series side of the unified power flow controller is replaced by the distributed series static compensator, which constructs a new distributed power flow controller. According to the characteristic that the integrals of all the cross product of terms with different frequencies are zero, the real powers of different frequency are identical, obtains the conclusion that one frequency real power will not infect on others. The 3rd harmonic currents, which are identical in three phases, are used to exchange the real power between the AC terminals of the voltage source converters instead of the common DC capacitor. Simulations demonstrate that this distributed power flow controller has all of the functions of the unified power flow controller, additionally, due to the independence of the series side converter from the shunt side converter as well as the use of multiple converters at series side, the reliability is improved and the cost is decreased.