tailieunhanh - Analyzing the impact of wind generation on the transient stability

This paper will mentioned the overall aspects of network transient stability with the existence of wind generation such as the influence on the critical clearing time (CCT), the location and the allowable penetration of wind generation. | SCIENCE & TECHNOLOGY DEVELOPMENT, , - 2015 Analyzing the impact of wind generation on the transient stability Phan Thi Thanh Binh Ho Chi Minh city University of Technology, VNU-HCM, Vietnam Ho Ngoc Thien Power Engineering Consulting Joint Stock Company 2, Vietnam (Manuscript Received on July 15, 2015, Manuscript Revised August 30, 2015) ABSTRACT The wind generation causes some troubles on the stability of power network. Observing the critical clearing time of circuit breaker with existence of wind generation, one conclusion about the degrading of stability will be drawn. The location and the penetration level of this generation are also considered in this paper. The 14 buses IEEE network is examined with the soft ware PSAT. Keywords: Wind Generator, CCT, transient stability, penetration level. 1. INTRODUCTION With the high level of wind generation, the power system stability in small and large disturbances must be considered [1] [2]. One of the reasons is that there is no exited wind for wind generator (WG). To build up the field, wind generator will absorb the reactive power from the network. For the fixed speed generator, when the short circuit occurs near the generator, due to the low voltage of network, a large amount of Q will be flowed into the generator. This causes the more decreasing of voltage and lowers the stability of network. For DFIGs, this situation is improved by the converters. Many works focused on the critical clearing time. The most widely methods are based on the changing clearing time until the network loses its stability during short circuit as in [3] [4] using some soft- wares. Other works were concentrated on finding the appropriate models of wind generators in stability studies [5] [6] . Some works focused on the analytical analysis assuming that Trang 86 the voltage at the wind generator bus is invariant [7] . This paper will mentioned the overall aspects of network transient stability with the existence of wind