Novel control strategy of grid-connected photovoltaic power supply for frequency regulation

Abstract

The maximum power point tracking (MPPT) mode is widely applied in photovoltaic (PV) power generation system. In this article, instead of MPPT, a novel control strategy of grid-connected PV power supply for frequency regulation is proposed. First, the static frequency characteristic curve of PV plant is proposed, and a method of synthesising the PV power output power–voltage characteristic curve and static frequency characteristic curve into frequency regulation curve of PV power supply is introduced. So the PV plant can participate in frequency regulation of the system. Through simulation analysis in power systems computer aided design (PSCAD)/electromagnetic transients including DC (EMTDC), PV plant realises the function of frequency regulation when load changes, so the variation of system frequency can be reduced and the frequency stability of power system can be improved, and the effectiveness of the strategy is verified.

Keywords

• maximum power point trackers
• power generation control
• frequency control
• power grids
• photovoltaic power systems
• control system synthesis
• MPPT
• photovoltaic power generation system
• novel control strategy
• grid-connected PV power supply
• static frequency characteristic curve
• PV plant
• PV power output power–voltage
• frequency regulation curve
• system frequency
• frequency stability
• power system
• grid-connected photovoltaic power supply
• maximum power point tracking mode