Energy storage grid-connected circuit based on lithium batteries and super capacitor and control method thereof

Abstract

The invention discloses an energy storage grid-connected circuit based on lithium batteries and a super capacitor and a control method thereof in the technical field of power equipment design, which is used for solving the problems that the electric power quality, the reverse current, the power random fluctuation and the like of a power grid are influenced by the grid connection of a distributed power supply. The energy storage grid-connected circuit comprises a lithium battery pack, a bidirectional power translation circuit, a super capacitor array, an inverter circuit, a filtering and grid-connected circuit and a three-phase AC (alternating current) breaker, which are connected in sequence. The control method comprises the following steps: controlling the bidirectional power translation circuit to discharge the lithium battery pack when a power-grid side needs power compensation and the lithium battery pack is in a normal working voltage state; controlling the inverter circuit to output power needing be compensated; and controlling the bidirectional power translation circuit to charge the lithium battery pack when the power-grid side has surplus power. According to the invention, when the distribution power supply generates random power fluctuation, the surplus power is stored, and electricity is supplied to the power grid properly when the power grid needs power compensation.

Description

technical field [0001] The invention belongs to the technical field of power equipment design, and in particular relates to an energy storage grid-connected circuit based on a lithium battery and a supercapacitor and a control method thereof. Background technique [0002] According to the guiding opinions on energy conservation and environmental protection, ensuring sustainable energy supply, promoting low-carbon economic development, and smart grid construction advocated by the Chinese government and the State Grid Corporation, all relevant scientific research institutes and equipment manufacturing R&D units will spend a lot of financial resources Material resources are invested in the research work of new energy and energy conservation and environmental protection. New energy power generation has become an important task in new energy research. [0003] New energy power generation has two operation modes: independent operation and grid-connected operation, and grid-connec...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an energy storage grid-connected circuit based on lithium batteries and supercapacitors and its control method, which are used to solve the problems of power quality, reverse current and random power fluctuations caused by distributed power grid-connected to the grid.

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