Load Frequency Control of Photovoltaic Generation-Integrated Multi-Area Interconnected Power Systems Based on Double Equivalent-Input-Disturbance Controllers

Minghui Yang, Chunsheng Wang, Yukun Hu, Zijian Liu, Caixin Yan and Shuhang He
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Minghui Yang: School of Automation, Central South University, Changsha 410083, China
Chunsheng Wang: School of Automation, Central South University, Changsha 410083, China
Yukun Hu: Department of Civil, Environment & Geomatic Engineering, University College London, London WC1E 6BT, UK
Zijian Liu: School of Automation, Central South University, Changsha 410083, China
Caixin Yan: School of Automation, Central South University, Changsha 410083, China
Shuhang He: School of Automation, Central South University, Changsha 410083, China

Energies, 2020, vol. 13, issue 22, 1-19

Abstract: With the rapid increase of photovoltaic (PV) penetration and distributed grid access, photovoltaic generation (PVG)-integrated multi-area power systems may be disturbed by more uncertain factors, such as PVG, grid-tie inverter parameters, and resonance. These uncertain factors will exacerbate the frequency fluctuations of PVG integrated multi-area interconnected power systems. For such system, this paper proposes a load frequency control (LFC) strategy based on double equivalent-input-disturbance (EID) controllers. The PVG linear model and the multi-area interconnected power system linear model were established, respectively, and the disturbances were caused by grid voltage fluctuations in PVG subsystem and PV output power fluctuation and load change in multi-area interconnected power system. In PVG subsystems and multi-area interconnected power systems, two EID controllers add differently estimated equivalent system disturbances, which has the same effect as the actual disturbance, to the input channel to compensate for the impact of actual disturbances. The simulation results in MATLAB/Simulink show that the frequency deviation range of the proposed double EID method is 6% of FA-PI method and 7% of conventional PI method, respectively, when the grid voltage fluctuation and load disturbance exist. The double EID method can better compensate for the effects of external disturbances, suppress frequency fluctuations, and make the system more stable.

Keywords: load frequency control; multi-area interconnected power system; photovoltaic generation subsystem; equivalent input disturbance (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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