Grid-connected and off-grid high-power bidirectional converter device

Abstract

The invention discloses a grid-connected and off-grid high-power bidirectional converter device, which comprises a direct-current side arrangement filter circuit, a bidirectional converter circuit, an alternating-current side filter circuit and a signal acquisition and control circuit, and is characterized in that the bidirectional converter circuit is used for inversion / rectification mutual conversion and switching of the discharging / charging state of an energy storage battery pack; the signal acquisition and control circuit is used for sending the acquired direct current side electrical acquisition signal, the acquired alternating current side electrical acquisition signal and the acquired conversion circuit control communication signal to corresponding interfaces of the central acquisition control unit to form a closed-loop control circuit to charge the energy storage battery pack or perform discharge maintenance on the energy storage battery pack; and the discharged electric energy is fed back to a power grid. According to the invention, the functions of DC-DC charging and discharging management, DC-AC inversion and AC-DC bidirectional mutual conversion current transformation, electric energy quality control monitoring, and charging and discharging management of the energy storage battery are integrated.

Description

technical field [0001] The invention belongs to the technical field of new energy power, and relates to a grid-connected and off-grid high-power bidirectional converter device, which is suitable for an energy storage system, a remote maintenance system for a battery pack, a remote charge and discharge management system for a battery pack, and a grid-connected energy storage system. Microgrid systems and other applications. Background technique [0002] The power system consists of six parts: development, generation, transmission, distribution, consumption, and storage. In the past ten years, with the continuous advancement of power energy transformation, as a key node to promote renewable energy from replacing traditional energy to new energy, the main energy storage technologies have received great attention from the industry. The energy storage system is of great significance to realize the functions of end-user personalized demand-side energy management, substation grid ...

AI Technical Summary

Problems solved by technology

The energy storage management system combined with traditional energy storage equipment such as rectifiers, inverters, energy storage converters and other separate equipment can solve the power limit problem faced by new energy sources, and can stabilize power fluctuations and reduce the impact on the grid. Common problems such as impact, but there are many types of equipment, large and bulky, and the degree of integration and intelligence is not high. In terms of technical performance, it is difficult to effectively provide intelligent services such as power peak regulation, frequency modulation, peak shaving and valley filling, and power quality management.

Images