Economic Optimization Control Method of Grid-Connected Microgrid Based on Improved Pinning Consensus

Zejun Tong, Chun Zhang (), Xiaotai Wu, Pengcheng Gao, Shuang Wu and Haoyu Li
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Zejun Tong: College of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China
Chun Zhang: College of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China
Xiaotai Wu: College of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China
Pengcheng Gao: College of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China
Shuang Wu: College of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China
Haoyu Li: College of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China

Energies, 2023, vol. 16, issue 3, 1-31

Abstract: For the sake of reducing the total operation cost of grid-connected microgrids, an improved pinning consensus algorithm based on the incremental cost rate (ICR) is proposed, which defines ICR as the state variable. In the algorithm, the power deviation elimination term is introduced to rapidly eliminate the total power deviation, and the pinning term is brought to realize the fast convergence to reference value. By computing the optimal ICR of the system, the optimal active output reference value of each distributed generation (DG) is obtained when the system realizes the economic optimization operation. In addition, an economic optimization control method of grid-connected microgrids, based on improved pinning consensus, is proposed. By utilizing the method, the economic optimization operation of the system is attained by basing on the established distributed hierarchical architecture and by sending the reference value of optimal active output of each DG to the P - f droop control loop. Finally, a simulation model of parallel operation system of six DGs is established. The impact of grid electricity price, pinning coefficient and other factors on the operation state of the system is analyzed and simulated. The simulation results show that the economic distribution of active output is completed. The proposed method can make the microgrid rapidly enter the economic optimization state, and can still reduce the total operation cost and possess the faster response speed under the conditions of changing electricity price, low algebraic connectivity topology, DG plug-of-play, dynamic line rating (DLR) constraint, etc.

Keywords: grid-connected microgrid; distributed hierarchical architecture; economic optimization control; ICR; pinning consensus (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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