High-capacity optical storage all-in-one machine and control method thereof

Abstract

The invention discloses a high-capacity optical storage all-in-one machine. The all-in-one machine comprises an energy storage battery pack, the two ends of the energy storage battery pack are connected with the input end of a three-level DC / DC converter, the output end of the three-level DC / DC converter is connected with a three-level DC / AC converter direct-current bus, and the three-level DC / ACconverter direct-current bus is further connected with a photovoltaic array. Transient / static frequency adjustment of the voltage frequency and amplitude of the grid-connected point is introduced andcan be directly connected with an electric power system, the voltage amplitude and frequency stability of the electric power system can be improved, and the problems that at present, a power grid hasa bottleneck in consumption of photovoltaic power generation electric energy, and the electric power system is unstable in operation are solved. The invention further discloses a control method of thehigh-capacity optical storage all-in-one machine.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering equipment, and relates to a large-capacity optical-storage integrated machine, and also relates to a control method for the large-capacity optical-storage integrated machine. Background technique [0002] In recent years, my country's photovoltaic power generation industry has achieved sustained and rapid development. According to data from the National Bureau of Statistics, the newly installed photovoltaic capacity in China in 2017 set a new record of 34.53GW in 2016, and the domestic market added 53GW, a year-on-year increase of 53.6%. Among them, distributed photovoltaic was 19.44GW, a year-on-year increase of 3.7 times. However, the large-scale connection of photovoltaic power generation systems to the grid brings the following problems: [0003] 1) There is a bottleneck in the power grid's consumption of photovoltaic power generation; [0004] 2) The equivalent inertia of th...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a large-capacity optical-storage integrated machine. Compared with the conventional optical-storage integrated machine, it introduces the transient / static frequency adjustment of the grid-connected point voltage frequency and amplitude, and can directly interface with the power system. It helps to improve the voltage amplitude and frequency stability of the power system, and solves the current bottleneck in the power grid's consumption of photovoltaic power generation and the unstable operation of the power system

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