DSP (digital signal processor) based energy-feedback electronic load grid-connected inverting system and control method thereof

Abstract

The invention discloses a DSP (digital signal processor) based energy-feedback electronic load grid-connected inverting system and a control method thereof. The system comprises a main circuit and a control circuit. The main circuit comprises a grid-connected inverting module and an output filter module in sequential connection, the grid-connected inverting module is connected with a 400V DC (direct-current) output end of a booster system, the output filter module is connected with a public power grid phase, and the control circuit comprises a fault protection circuit module, a current voltage sampling and signal processing module, a human-computer interaction module, a DSP embedded system module and a high-frequency driving module. Fully digitalized control of the grid-connected inverting system is realized by a reliability test aiming at low-voltage direct-current power output characteristics for the first time in China, on the basis of the high-frequency PWM (pulse-width modulation) technology and adopting an industrial-level high-performance digital signal processor DSP chip, 400V high-voltage direct-current output by the energy-feedback electronic load booster system is inverted into 220V single-phase power-frequency current, and an output side is connected into a power grid.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a DSP-based energy-feedback electronic load grid-connected inverter system and a control method. Background technique [0002] In order to ensure the quality of power supply products and meet the performance indicators in line with the factory requirements, the power supply must be tested for 24 to 72 hours or even longer before leaving the factory, including: power supply reliability test, power supply load test and output characteristic test. Due to the complex form of the load connected to the actual power supply, the traditional load cannot completely simulate the performance of the power supply in various normal states and limit states, and the traditional load is made of metal materials of different materials, and it is 100% in the test process. It consumes electric energy and causes a large amount of energy loss, so it is urgent to improve the adjustable ability ...

AI Technical Summary

Problems solved by technology

However, this kind of electronic load equivalent to pure resistance is operated by the transistor in the amplified state, and the equivalent output resistance of the transistor is controlled by the control electrode. As a result, the electric energy is still completely wasted. Compared with the pure resistance load, it is only its equivalent resistance Continuously adjustable, the common problems of the two are: energy consumption, heat generation and bulky

However, this electronic load is designed for the aging test of traditional communication power supplies, and it is also not suitable for aging tests of low-voltage and high-current DC power supplies.

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