双馈风电场穿透率及接入形式对系统稳定性的影响分析

doi:10.3969/j.issn.1000-7229.2015.03.003

摘要/Abstract

摘要：

为了研究双馈风电场穿透率及接入形式对系统稳定性的影响，首先给出了以微分代数方程描述的双馈风力发电机动力学模型，推导了全系统系数矩阵。然后，根据小干扰分析理论，计算了含风电场系统的特征值及参与因子，并确定系统的主导振荡模式。最后，以扩展的IEEE 3机9节点系统为例，对不同穿透率水平及不同接入形式下各振荡模式的阻尼变化进行了分析比较。研究表明，随着穿透率的增加，在原有同步机容量相应减小且系统未作补偿的情况下，与风电场电气距离较近的同步发电机功角稳定性有明显下降。在相同穿透率下，静止无功补偿器（static var compensator, SVC）补偿容量的增加对系统电压及功角稳定性均有明显改善作用，穿透率水平越高，SVC无功补偿对稳定性的改善作用越弱。由此可知，双馈风电场穿透率及接入形式对系统稳定性有较大影响。

关键词: 双馈风电场, 穿透率, 接入形式, 小干扰稳定性

Abstract:

To study the impacts of penetration rate and integration methods of DFIG-based （doubly fed induction generator） wind farm on system stability, firstly, the dynamic model of doubly-fed induction generator was described by the differential algebraic equations, and the coefficient matrix of total system was derived. Then, the eigenvalue and participation factors of wind farm system were calculated according to the small signal analysis theory, and the dominant oscillation modes of system were determined. Finally, taking augmented IEEE 3-generator and 9-bus test system as example, the damping changes of electromechanical oscillation modes were analyzed under different penetration rates and various integration methods. The research results show that, the increasing of penetration rate of wind generation has a detrimental impact on the power angle stabilities of the adjacent synchronous machines when their capacities are reduced at the meantime and the system is without compensation. The stabilities of systems voltage and power angle are improved greatly with the increasing of SVC （static var compensator） compensation capacity, under same penetration rate. The improving effect of the SVC compensation on the system stability will decrease with the increase of penetration rate. It follows that the penetration rate and integration methods of DFIG-based wind farm have great influences on the system stability.

Key words: DFIG-based wind farm, penetration rate, integration methods, small signal stability

朱洁，周海强. 双馈风电场穿透率及接入形式对系统稳定性的影响分析[J]. 电力建设, 2015, 36(3): 15-20.

ZHU Jie，ZHOU Haiqiang. Impacts of Penetration Rate and Integration Methods of DFIG-Based Wind Farm on System Stability[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(3): 15-20.

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