Effect of Variable Speed Wind Turbine Generator on Stability of a Weak Grid

Abstract

In this paper, we illustrate the effect of adding a hypothetical 100-MW doubly fed induction generator (DFIG) wind power plant to a weak transmission system. The effects of various wind plant load factors (100, 60 and 25% of nameplate rating) are investigated. System performance is compared to a 100-MW conventional synchronous generator interconnected at the same location. The conventional generator is installed some distance away. The simulations demonstrated that DFIG generators provide a good damping performance under these conditions. These results support the conclusion that modern wind power plants, equipped with power electronics and low-voltage ride-through capability, can be interconnected to weak power grids without reducing stability. To conduct the studies, we selected an area of the Western Electricity Coordinating Council power system that is electrically far from major generation centers and is weakly connected to the bulk transmission system. The area contains large motor loads. We observed the dynamic response of large motors in the vicinity, especially their ability to ride through fault events. The studies were conducted using positive sequence phasor time-domain analysis.Index Terms-Low voltage ride through, power system, renewable energy, stability, variable-speed generation, weak grid, wind energy, wind farm, wind power plant, wind turbine.

Strategies for Voltage Control and Transient Stability Assessment

“…2 In this case, the term impasse is often used rather than deadlock. If the x 2 -integrator is blocked,ẋ 2 = 0, givingẍ 1 = 1 Tu > 0 because u is increasing.…”

“…It is to be expected, therefore, that the dynamic performance of power systems may change as traditional generation is displaced by ever increasing numbers of WTGs. Numerous studies have investigated this issue, and have drawn various conclusions [1,2,3,4,5]. This chapter does not address the system-wide dynamic implications of largescale wind generation per se.…”

Estimating PMSG Wind Turbines by Inertia and Droop Control Schemes with Intelligent Fuzzy Controller in Indian Development

“…In [9] pitch control is additionally used to provide frequency response in DFIG WTs. Relevant studies are majorly based on simple models for either the power system or the WTs and the responses are mainly studied for disturbances on the DFIG scheme [8][9][10][11][12][13][14][15]. The basic issues of parameter selections are usually ignored; as is the matter of the required primary reserves to be maintained in order for the wind farms (WFs) to provide the expected response.…”

Variable speed wind turbine generator system with current controlled voltage source inverter

“…Among them, operation and stability analyses of DFIG type of variable speed wind turbine (VSWT) have been reported in many researches [3][4][5][6][7]. On the other hand, though the stability analyses of conventional synchronous generators have been extensively reported in many literatures [8][9], the analysis is still insufficient for synchronous generators using full rating of frequency converters which are used in variable speed operation of wind generators.…”

“…Finally, it is concluded that the proposed VSWT-PMSG with CC-VSI can operate well in both dynamic and transient conditions. 4 …”