抑制区域间低频振荡的FACTS阻尼控制

随着电力系统规模的不断扩大,区域间低频振荡正成为限制电网传输能力的瓶颈。对少数发电机组安装PSS来抑制区域间低频振荡很难有好的效果。但FACTS因其安装地点的灵活性及良好的动态性能而给抑制区域间振荡提供了新的手段。为此,利用相角补偿原理,设计控制器持续减小区域间的振荡能量,以此来实现区域间阻尼控制。以SVC为例详细说明附加阻尼控制器的设计,通过PSASP软件下的仿真结果表明,具有附加阻尼控制作用的SVC能有效地抑制区域间低频振荡。另外,对其它几种常用的FACTS器件也设计了阻尼控制器,并同样通过了PSASP下的仿真验证,阻尼效果很好。以上结果证明利用FACTS可实现区域间低频振荡的阻尼控制。

Damping Control with FACTS Aiming at Damping Inter-area Oscillation

Electromechanical oscillations are composed of local oscillation and inter-area oscillation. With the development of electric power systems, inter-area oscillation has been a major concern. Inter-area oscillation, which aroused by many generators in different areas, will not be damped effectively if only a few generators install power system stabilizer which could be very effectively to damp local oscillation, while flexible ac transmission system(FACTS) may have a good effect because of its installing flexibly and good dynamic performance. So FACTS is used to damping inter-area oscillation in this paper. With the developing of power electric, FACTS have a good progress, and are used widely in power system. In this paper, four kinds of FACTS are introduced while their models are based in power system analysis software package(PSASP). The power in area oscillation is constant in non-damping power system, which is testified in this paper. So a damping controller of FACTS is designed with the theory of deducing the power in area oscillation. In this paper, SVC is taken for example to design the damping controller, and proved the effect by simulation in PSASP. Damping controllers of other kinds of FACTS including TCSC, STATCOM and SSSC are also designed, which also have good effect to damping inter-area oscillation by simulation. The power oscillation between two areas is damped quickly while these FACTS are installed. The results indicated that it is effective to damp the inter-area oscillation through FACTS.