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MPC-based Two-stage Rolling Power Dispatch Approach for Wind-integrated Power System

  • Zhai, Junyi (State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University) ;
  • Zhou, Ming (State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University) ;
  • Dong, Shengxiao (State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University) ;
  • Li, Gengyin (State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University) ;
  • Ren, Jianwen (State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University)
  • Received : 2017.06.07
  • Accepted : 2017.12.22
  • Published : 2018.03.01

Abstract

Regarding the fact that wind power forecast accuracy is gradually improved as time is approaching, this paper proposes a two-stage rolling dispatch approach based on model predictive control (MPC), which contains an intra-day rolling optimal scheme and a real-time rolling base point tracing scheme. The scheduled output of the intra-day rolling scheme is set as the reference output, and the real-time rolling scheme is based on MPC which includes the leading rolling optimization and lagging feedback correction strategy. On the basis of the latest measured thermal unit output feedback, the closed-loop optimization is formed to correct the power deviation timely, making the unit output smoother, thus reducing the costs of power adjustment and promoting wind power accommodation. We adopt chance constraint to describe forecasts uncertainty. Then for reflecting the increasing prediction precision as well as the power dispatcher's rising expected satisfaction degree with reliable system operation, we set the confidence level of reserve constraints at different timescales as the incremental vector. The expectation of up/down reserve shortage is proposed to assess the adequacy of the upward/downward reserve. The studies executed on the modified IEEE RTS system demonstrate the effectiveness of the proposed approach.

Acknowledgement

Supported by : Central Universities

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