Abstract
The decommissioning of synchronous generators, and their replacement by decoupled renewable power plants, has a significant impact on the transient stability performance of a power system. This paper concerns with an investigation of the degree of transient stability enhancement that can be achieved in power systems with high shares (e.g., around 75%) of wind generation. It is considered that the wind generators can work either under the principle of current control or under the principle of fast local voltage control. In both cases, a power–angle modulation (PAM) controller is superimposed on the current control loops of the grid side converters of the wind generators. The investigation of the degree of enhancement takes into account different approaches of the tuning of PAM. It considers a simple approach in the form of parametric sensitivity, and also a sophisticated approach in the form of a formal optimization problem. Besides, the paper gives insight on what is a suitable objective function of the optimization problem, which entails the best performance of PAM. The whole investigation is conducted based on a synthetic model of the Great Britain (GB) system
Highlights
Electrical power supply has been historically dominated by conventional power plants with directly coupled synchronous generators
To ascertain if a better transient stability performance can be achieved, Section 4 of this paper provides an analysis of the tuning problem from an optimization point of view
The high gain value of the power–angle modulation (PAM) attached to the large size wind power plants (e.g., WG19) entails that these plants will have to spend more kinetic energy within a very short time
Summary
Electrical power supply has been historically dominated by conventional power plants with directly coupled synchronous generators. Due to recent environmental concerns, there is a strong motivation to accelerate the decommissioning of conventional plants ( most fossil fuel-fired power plants) and their replacement by renewable power generation As of this writing, the European Union has set a “20-20-20” target plan, which aims to achieve a 20% reduction in greenhouse gas emissions compared to 1990 levels. A previous work by the authors of this paper, published in [5], provides a review of the methods proposed so far in the existing literature to attempt to safeguard the transient stability of systems with shares of renewable power generation up to 50%. The degree of transient stability enhancement that can be achieved in power systems with high shares (beyond 50%) of decoupled wind generation is investigated.
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