Energy storage system based on distributed photovoltaic power generation

Abstract

The invention relates to an energy storage system based on distributed photovoltaic power generation. The energy storage system comprises an equalization controller, a double-pole double-throw switch, a grounding resistor, an XOR gate circuit, an AND gate circuit and a switch tube, wherein the switch tube is arranged between an equalization module and a battery module, a first group of contacts of the double-pole double-throw switch are arranged between the battery module and an output circuit, the common ends of a second group of contacts is connected to a first power supply, the normally open ends of the second group of contacts are respectively connected to one end of the grounding resistor and the first input end of the XOR gate circuit, the other end of the grounding resistor is grounded, the second input end of the XOR gate circuit is connected to the first output pin of the equalization controller, the first input end of the AND gate circuit is connected to the output end of the XOR gate circuit, the second input end of the AND gate circuit is connected to the first output pin of the controller, and the output end of the AND gate circuit is connected to the control signal input end of the switch tube. Compared with the prior art, the system has the advantages of improving reliability and the like.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation, in particular to an energy storage system based on distributed photovoltaic power generation. Background technique [0002] Green power refers to the use of specific power generation equipment, such as wind turbines, solar photovoltaic cells, etc., to convert renewable energy such as wind energy and solar energy into electrical energy. Compared with conventional thermal power generation, which is to obtain electricity by burning fossil fuels such as coal, oil, and natural gas, electricity from renewable energy is more conducive to environmental protection and sustainable development. The research on the development strategy and operation management of green power is particularly important in the context of the increasingly prominent contradiction between human development and environmental protection. [0003] The access to new energy will bring many uncertain factors (such as the ti...

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Problems solved by technology

[0003] The access to new energy will bring many uncertain factors (such as the time-varying nature of new energy power generation, etc.), so it will face the risk of cost fluctuations when formulating power generation dispatching plans and demand-side power system planning, which is not conducive to Safe and Stable Operation of Power System

[0004] At present, the cost of photovoltaic power generation has been significantly reduced, and the average power generation cost is even lower than that of coal-fired power generation. Therefore, due to its low cost, photovoltaic power generation has been gradually valued. However, the time constraints of photovoltaic power generation are still very serious. use, and the timing characteristics of its power generation during the day may not coincide with the power consumption curve, so it can only be matched by scheduling the processing of peak-shaving units, and due to the discretization of photovoltaic power generation, the summary processing of this information will consume A large number of resources, and there is a huge difficulty in coordinating

[0005] In order to solve the above problems, some existing technologies adopt a distributed energy storage system, allowing each distributed energy storage power source to perform peak-shaving and valley-filling for its corresponding photovoltaic power generation device, thereby reducing the burden on the grid side, but this In this mode, the switching of the energy storage power supply is more frequent, and the start-up of the equalization module may conflict with the output, so avoidance logic is required. The traditional method directly implements avoidance through the controller. Although the cost is low, the reliability is not high

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