Secondary power supply seamless switching circuit of optical storage complementary grid-connection and grid-disconnection integrated energy management

Abstract

The invention relates to a secondary power supply seamless switching circuit of optical storage complementary grid-connection and grid-disconnection integrated energy management. The secondary power supply seamless switching circuit comprises a direct-current bus. The direct-current bus is provided with a battery set, a photovoltaic assembly, and an HVDC module which are mutually connected in parallel. The direct-current bus is connected to an input end of the HVDC module. A circuit breaker is installed between the direct-current bus and the HVDC module. A second relay switch is arranged between the circuit breaker and the HVDC module. The second relay switch is connected with a current limiting resistor in parallel. The current limiting resistor is connected with a starting button in series. An output end of the HVDC module is connected with a second coil in parallel. The second coil is connected with a Switch Support Board module in parallel. According to the invention, two common schemes are combined, one path is characterized in that a high voltage direct current is got from the high voltage direct current bus and converted into a required direct current, the other path is characterized in that an alternating current is got from an output side of an inverter and converted in the required direct current, and action switching and direct current loop supporting are provided.

Description

technical field [0001] The invention relates to the technical field of photovoltaic energy management systems, in particular to a secondary power supply seamless switching circuit for solar-storage complementary and off-grid integrated energy management. Background technique [0002] At this stage, energy storage systems and photovoltaic power generation are closely integrated, and a large number of home energy management systems have flooded into the market. The home energy management system stores the energy of photovoltaic modules in the battery pack. If the photovoltaic energy is not enough to support the household battery, the battery pack will be activated to supplement the power. If the battery pack is dead, the grid-connected switch will be switched to the grid to continue to supply power to the home. . In addition, if there is a surplus of photovoltaic power, it will be sold on the grid. The home energy management system is constantly switching in these working co...

AI Technical Summary

Problems solved by technology

At present, there are two main solutions on the market: one is to take power-frequency AC power from the household electricity side and transform it into the required DC power supply controller. Considering that the household power consumption is relatively stable, this solution is also a low-cost solution. But once there is a power outage, the whole system will not be able to start, and the UPS function of this energy management system will not be realized; the second is to take high-voltage direct current from the battery side and convert it into the required direct current supply controller through the converter. Under any circumstances, as long as the battery is weak, the system can be started, but like the first one, it cannot be started when the battery is dead, and this solution is not optimal for the use efficiency of the battery pack.

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