Self-adaptive power control method of photovoltaic power generation hybrid energy storage system

Abstract

The invention discloses a self-adaptive power control method of a photovoltaic power generation hybrid energy storage system. The system comprises a hybrid energy storage device, a DC bus, an AC bus, converters and various loads, wherein the hybrid energy storage device comprises a photovoltaic cell array, a storage battery energy storage unit used for converting solar energy to electric energy, a supercapacitor energy storage unit and two energy storage power supplies, the storage battery energy storage unit and the supercapacitor energy storage unit are connected with the DC bus respectively through respective DC / DC converter, a photovoltaic power generation unit is connected to the AC bus through a DC / AC inverter, the DC bus passes through the DC / AC inverter to be connected with the AC bus, different control strategies are adopted, a storage battery DC / DC converter adopts power control, and a supercapacitor DC / DC converter is used for voltage control of the DC bus. The whole system adopts a self-adaptive power control strategy to achieve system coordination control, thus, the energy storage advantages of a storage battery and a supercapacitor are developed, and a good power throughput effect is obtained.

Description

Technical field [0001] The invention relates to the technical fields of microgrid, renewable energy power generation and energy storage, and in particular to a power adaptive control method of a photovoltaic power generation hybrid energy storage system. Background technique [0002] The flexible control of distributed power characteristics of microgrids is a powerful supplement to large-scale power grids. It plays an important role in the power system and provides an effective way to promote the development and utilization of renewable energy, energy conservation, emission reduction, and green power consumption. The microgrid is integrated into the grid and also operates independently. With the continuous increase of renewable energy generation capacity, the impact of power fluctuations on the safe operation of the power grid and power quality during microgrid island operation has become more and more obvious. The use of energy storage devices can play a role in suppressing pow...

AI Technical Summary

Problems solved by technology

However, it is difficult for a single energy storage device to meet the requirements of both power control and energy management

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