Combined type energy storage system matched with photovoltaic power station

Abstract

The invention discloses a combined type energy storage system matched with a photovoltaic power station. The combined type energy storage system comprises a controller, a converter and a power grid connected with the photovoltaic power station in series in sequence; and a lithium battery, a lithium battery management system, a supercapacitor and a supercapacitor management system are connected between the controller and the converter in parallel to form a circuit, wherein the energy storage proportion of a lithium battery energy storage system and a supercapacitor energy storage management system is regulated and controlled by the controller. A monitoring module is built in the controller, and the module is connected with a sampling circuit, a protection circuit, a communication circuit and an auxiliary circuit in the controller, so that the voltage and current at the input and output ends can be monitored in real time, and the operation state information of the whole system can be collected, processed and regulated and controlled; by virtue of the design, the output quality of the photovoltaic power station can be greatly improved, and the power supply requirement of a common power grid can be satisfied; and therefore, the photovoltaic power station can realize full-power output, without light abandonment loss, thereby greatly improving the operation benefits of the photovoltaic power station and shortening the cost recovering period of investors.

Description

technical field [0001] The present invention relates to an electric energy storage system, in particular, the present invention relates to an energy storage system for a photovoltaic power station, especially a combined energy storage system for a photovoltaic power station. Background technique [0002] With the continuous improvement of renewable energy technologies such as wind power and photovoltaic power generation, a group of large-scale operators for business purposes have entered the market. The proportion of stronger traditional generating units has decreased accordingly. In this case, the large use of renewable energy brings two challenges to the public grid. First of all, the inertia of the power system decreases, and the ability to deal with disturbances is insufficient. These problems are mainly reflected in the regulation of frequency and voltage and power quality. Another problem is that renewable energy power generation and load are not synchronized, which ...

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Problems solved by technology

[0003] The present invention mainly aims at the problem that the efficiency of configuring a single energy storage system in the prior art is not high, and proposes a combined energy storage system for a photovoltaic power station, which is a hybrid configuration based on a lithium battery energy storage system and a supercapacitor energy storage system It has the advantages of reasonable configuration, strong functional complementarity, and good smooth output quality, making it easy for the supporting photovoltaic power station to achieve full-load operation

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