作　　者： ; ; ; ;

机构地区： 郑州轻工业学院电气信息工程学院

出　　处： 《华北电力大学学报（自然科学版）》 2014年第2期6-14,共9页

摘　　要： 静止无功补偿器(SVC)通常用于改善系统电压稳定性,但采用附加阻尼控制(ADC)后也可以抑制系统低频振荡。当互联电力系统中并网风电场装机渗透率达到一定水平后,区域间低频振荡就成为制约区域间电力传输能力和容纳风电能力的瓶颈,采用有ADC的SVC(简称ADC-SVC)有助于增加系统阻尼进而在相当程度上解决这一问题。在此背景下,研究ADC-SVC对含双馈感应风力发电机组(DFIG)的互联电力系统阻尼特性的影响。首先,简要介绍了DFIG的数学模型,导出了在转子电流限制条件下DFIG的无功功率极限。之后,分析了在含SVC的互联系统中与区域模式振荡相关的暂态能量。在上述工作基础上,针对SVC设计了用于改善系统阻尼特性的ADC,并采用特征根灵敏度法确定控制器参数。最后,以IEEE 2区域4机系统为例,分析了SVC电压控制增益与ADC增益对系统阻尼的影响,研究了ADC采用不同输入信号时的系统阻尼特性,并对比分析了不采用SVC、采用传统SVC和ADC-SVC的效果。仿真结果表明,ADC-SVC能有效提高互联系统的动态稳定性水平,对不同的系统运行方式和区域间振荡模式具有较好的鲁棒性。 The static var compensator （SVC） is often used to improve vohage stability of the power system concerned, but can also be employed to damp low-frequency oscillations if equipped with the auxiliary damping control （ADC）. When the penetration level of the installed wind generation capacity reaches a certain degree, the inter-area low fre- quency oscillation will limit the transfer capabilities among various areas and the accommodating capability of wind pow- er by the associate interconnected power system, while a SVC equipped with ADC （ADC-SVC for short） can increase the system damping and hence solve this problem to some extent. Given this background, the impacts of the ADC-SVC on the damping characteristics of interconnected power systems with doubly fed induction generators （DFIG） integrated are examined. First, the dynamic model of DFIG is briefly introduced, and the reactive power output limit of DFIG ob-tained. The transient energy associated with area-mode oscillations is next analyzed for the interconnected power system with SVC. Then, ADC is designed for SVC so as to improve the damping characteristic of the power system, and the control parameters of ADC are determined by the eigenvalue sensitivity method. Finally, the IEEE 2 - area 4 - unit system is employed to demonstrate the proposed method. Specifically, the impacts of the SVC voltage gain and the ADC gain on system damping as well as the damping characteristics of different ADC input signals are examined, and the effects are compared among the scenarios without SVC （NSVC） , with conventional SVC （NADC-SVC） and with ADC- SVC. Case studies demonstrate that ADC-SVC can effectively enhance the dynamic stability of interconnected power systems, and is robust to the variations of system operating conditions and oscillation modes.

关 键 词： 互联电力系统 双馈感应风电机组 阻尼特性 静止无功补偿器 附加阻尼控制

领　　域： [电气工程]