Light storage power generation system control method and storage medium

Abstract

The invention discloses an optical storage power generation system control method and a storage medium, the method is applied to an optical storage power generation system based on a VF source type virtual synchronous machine working in an off-grid state, and the method comprises the following steps: obtaining photovoltaic output power and load power of the optical storage power generation system; judging whether the photovoltaic output power is greater than the load power; when the photovoltaic output power is smaller than the load power, setting a voltage component according to the direct-current voltage deviation of the optical storage power generation system; superposing the voltage component on the voltage loop, adjusting the output power of the optical storage power generation system, and enabling the output power to be matched with the load power; and when the photovoltaic output power is greater than or equal to the load power, if the charge state of the energy storage battery reaches a limit value or the energy storage system cannot work normally, the photovoltaic working mode is converted into a variable power tracking mode, and the photovoltaic output power is changed by adjusting the photovoltaic working voltage, so that the balance between the photovoltaic output power and the load power is realized. The method can effectively ensure power balance in the system and improve the stability of the system.

Description

technical field [0001] The invention relates to the field of photovoltaic energy storage power generation system control, in particular to a control method and storage medium of a photovoltaic energy storage power generation system. Background technique [0002] Explanation of terms and abbreviations: [0003] Photovoltaic (PV) [0004] Energy storage system (ESS) [0005] Energy management system (EMS) [0006] Photovoltaic-battery energy storage system (PV-BES) [0007] Virtual synchronous generator (VSG) [0008] Voltage / Frequency Control (VF Control) [0009] Maximum power point (MPP) [0010] Maximum power point tracking (MPPT) [0011] State of Charge (SOC) [0012] Active Power - Frequency (P-f) [0013] Reactive Power - System Voltage (Q-U). [0014] Photovoltaic power generation generally adopts the maximum power point tracking (MPPT) working mode. In this mode, the photovoltaic cell always works at the maximum power point (MPP). Photovoltaic power genera...

AI Technical Summary

Problems solved by technology

Therefore, when the energy storage system may not start in time or the energy storage system cannot work normally due to failure, downtime, etc., the photovoltaic storage power generation system has been separated from the grid and the internal power of the system is unbalanced, which will lead to DC Voltage rises or falls rapidly

In addition, when the PV, energy storage and load power of PV-BES are unbalanced in the off-grid operation state, the system will also be unstable.

In short, based on the scenarios and requirements, in the existing related research, the control strategy for the multiple operation modes of PV-BES still needs to be studied

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