Area high-permeability photovoltaic energy storage system and energy management method thereof

Abstract

The invention relates to an area high-permeability photovoltaic energy storage system and an energy management method thereof. The area high-permeability photovoltaic energy storage system comprises a photovoltaic battery array, an energy storage battery assembly, a deflector, a load, an area electrical network and an energy management system. When the area high-permeability photovoltaic energy storage system is connected to a network for operation, the energy management system carries out three-ring control of a power outer ring, a voltage middle ring and a current inner ring, and realizes the maximum utilization of photovoltaic energy, active power smooth input and reactive power compensation through the largest-power tracking of the photovoltaic battery array and the charging and discharging management of the energy storage battery assembly; and when the area high-permeability photovoltaic energy storage system is isolated for operation, the energy management system realizes double-ring control of a voltage / frequency outer ring and the current inner ring for providing constant voltage and frequency for the area high-permeability photovoltaic energy storage system and maintaining the stable operation of the system. The photovoltaic generating and energy storage technologies are fully combined so that photovoltaic and energy storage coordinated control is realized, the network point power fluctuation is inhibited, the grid-connected power generation of an area high-permeability photovoltaic power generation system is realized, and the system energy management efficiency, the power supply reliability and electric energy quality are effectively improved.

Description

technical field [0001] The invention relates to a solar photovoltaic power generation system, in particular to a regional high-permeability photovoltaic energy storage system and an energy management method thereof. Background technique [0002] Energy is the basis for human survival and development. Traditional non-renewable energy sources are decreasing day by day, and there are serious environmental pollution problems. Solar energy has the advantages of rich resources, no geographical restrictions, and environmental friendliness. It is the renewable energy with the most development potential in the 21st century. [0003] At present, the transmission and conversion of photovoltaic power generation energy is based on power electronics technology. Large-scale photovoltaic access has led to the introduction of a large number of power electronic converters into the power system, causing serious power quality problems to the power system. In addition, the islanding effect and ...

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Problems solved by technology

[0005] The present invention aims at the problems of single function, high cost and low efficiency of the existing photovoltaic power generation energy management system, and proposes a regional high-permeability photovoltaic energy storage system and its energy management method, combined with the layered control of the energy management system of the system The high-speed processing capability can realize the maximum power tracking MPPT of the photovoltaic cell array, the charging and discharging control of the battery energy storage component, and the optimal coordinated control of the two distributed power sources, effectively smoothing the active power fluctuation when the photovoltaic power generation system is connected to the grid, and real-time dynamic compensation Reactive power requirements, increase the penetration rate of large-scale photovoltaic power generation systems in the region, maximize the utilization of solar energy and the output power quality of photovoltaic power generation systems, and enhance system stability, thereby improving the overall performance of photovoltaic power generation systems

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