Wind power utilization improvement by using hierarchical controlled microgrid

  • Cheng DING

Student thesis: Doctoral Thesis

Abstract

In this thesis, a possible solution for improving the utilization of wind power energy without causing impact to the power grid by using microgrid concept, which promises the function of making a cluster of generators and loads behave like a controllable unit, is proposed. This microgrid concept is achieved by a proposed hierarchical control method which contains three levels: decentralized level 1(primary or bottom level)is of fast response and can satisfy the essential power system operation requirements; centralized level 2 (secondary or middle level) eliminates control target deviation and rely on low band width communication channels to achieve accurate control objectives within several seconds; level 3(tertiary or top level) is the system organization level in which on-site functions such as seamless states transition operation and off-site functions such as setting points optimization are executed. A 4-bus microgrid model built in MATLAB/Simulink is used for individual validation tests of the different control level. The following experiments are executed in the wind power generators integrated CERTS 20-bus microgrid system. The simulation results show the system variations caused by wind power can be digested within the microgrid system with cooperation of the local loads, backup generators and energy storage devices which are operated by the hierarchical control system. In which case, the impact of wind power fluctuation can be absorbed by using microgrid concept with the proposed hierarchical control method.
Date of Award1 Aug 2019
Original languageEnglish
Awarding Institution
  • University Of Strathclyde
SupervisorKwok Lo (Supervisor) & Graham Ault (Supervisor)

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