A micro-grid power supply based on half-sine wave

Abstract

The invention discloses a micro-grid power supply based on a sine half-wave bus, which belongs to the field of distributed micro-grid power supplies. The topology of the power supply includes a full-bridge rectifier module (3), a BOOST module (1), a BUCK module (2) and a full-bridge inverter module (4). The input interface of the power supply includes a mains interface and a new energy power interface ( The following takes photovoltaic power as an example). The mains input is rectified by the full bridge to obtain a sine half-wave DC bus; the photovoltaic cell first outputs the maximum power through the BOOST module, and then outputs a current source with the same frequency and phase as the sine half-wave DC bus through the BUCK module, and directly sinks into the DC bus; The converging DC bus outputs sinusoidal alternating current to the load through a power frequency full-bridge inverter circuit. The invention adopts the sinusoidal half-wave DC bus confluence control to realize photoelectric real-time complementarity, and can obtain stable output and high-efficiency utilization of photovoltaic energy without energy storage equipment and large-capacity bus capacitors, thereby reducing the cost of the power generation system and prolonging the life of the power supply. Purpose.

Description

Background technique: [0001] With economic development, population increase, energy consumption increases rapidly, bringing about major problems such as energy shortage, environmental pollution, and ecological deterioration. Research institutions and enterprises all over the world have invested a lot of manpower and material resources in this emerging industry. In the past few years, photovoltaic grid-connected inverters with grid-connected power generation functions have been widely used in Europe and the United States. There are potential impacts on the large grid. Some other studies have developed photovoltaic independent inverters for specific applications, which are used in remote and island areas where the power grid is difficult to popularize. In order to obtain stable electric energy, independent inverters are usually equipped with large-capacity battery packs to realize time-sharing dispatch of energy. However, the defects of current battery technology have led to t...

AI Technical Summary

Problems solved by technology

In order to obtain stable electric energy, independent inverters are usually equipped with large-capacity battery packs to realize time-sharing dispatch of energy. However, the defects of current battery technology have led to the inherent high initial investment and maintenance costs of these products, and energy utilization. Insufficient efficiency and various safety hazards caused by batteries

[0002] The above reasons have caused difficulties in the promotion of photovoltaic inverters in civil and industrial fields.

Images