A multi-purpose energy storage inverter system

Abstract

The invention belongs to the technical field of power energy storage inversion and in particular relates to a multifunctional energy storage inversion system. The multifunctional energy storage inversion system comprises a photovoltaic and new energy power input end, a bidirectional inverting circuit, a protection and switch circuit, a power supply output power line, a charging-discharging module, a monitoring module, a B1 monitoring and sensing circuit, a B2 monitoring and sensing circuit, a control module, a system bus, a B1 path electric control switch, a B2 path electric control switch, a B1 storage battery and a B2 storage battery. Two or more groups of storage batteries are utilized; the real-time monitoring is carried out through the monitoring module; the storage batteries in corresponding charge and discharge states are controlled; the whole charge or discharge process is independently carried out in a corresponding state; the service life of each storage battery is prolonged; the reliability and the security of the energy storage inversion system are enhanced; and the robustness and the black start capability of the energy storage inversion system are enhanced.

Description

technical field [0001] The invention belongs to the technical field of electric power energy storage inverter, and in particular relates to a multifunctional energy storage inverter system. Background technique [0002] The wide application of new energy power and micro-grid has promoted the development of energy storage inverters and systems, and is developing towards a multi-purpose energy storage inverter system for power generation, storage, power supply, and grid-connected and off-grid sharing. Therefore, many energy storage inverter products have appeared on the market. For example, the products of the world-renowned ABB company and the well-known Chinese inverter company "Sunshine Power" have provided support and made contributions to the grid-connection and networking of new energy power systems, as well as power generation and power supply. [0003] However, the energy storage inverters and system products seen in the existing technology and the market are mainly d...

AI Technical Summary

Problems solved by technology

[0003] However, the energy storage inverters and system products seen in the existing technology and the market are mainly developed based on UPS technology for energy storage and backup. The energy storage part is composed of a set of batteries connected to the DC terminal of the bidirectional inverter circuit. Its disadvantage is that when there is a load that needs to supply power, even if the battery is charging, the battery will switch to the state of discharging, so that the battery pack is essentially not controlled by the charge and discharge control circuit, which seriously affects the healthy work and operating life of the battery. ; Moreover, in the microgrid, the energy storage inverter system is mainly responsible for supporting the grid environment of the microgrid. After the battery is discharged, a single battery pack needs to add a certain amount of electricity to make the inverter circuit work again and supply power. This is because the startup The voltage is higher than the minimum voltage that can be set for discharge. For this, if the new energy power generation is insufficient or does not generate power, it will affect the inverter circuit to start and work again, and even paralyze the microgrid; moreover, the existing technology and the market have seen Energy storage inverters and system products cannot be integrated to effectively realize the multi-functional energy storage inverter system for power generation, storage, power supply, and grid-connected and off-grid sharing, which affects the performance of the system.

Images