Electricity production feedback system using renewable energy source

Abstract

The invention relates to a novel renewable energy generation feedback system, which is characterized in that the novel renewable energy generation feedback system comprises direct current power, an isolation transformer, a plurality of power change modules and a main control circuit, wherein the direct current power is produced by a generation device, the isolation transformer is used to feedback electric energy to a power network, a primary side thereof is a three-phase winding and is connected with the power network, and a secondary side thereof is a multi-channel three-phase winding. The power change modules change direct current to alternating current, the input ends of various power change modules are connected in series and are directly connected with the direct current power or are connected through matching inductance, and the output end of the power module is respectively connected with the secondary side winding of the isolation transformer. The main control circuit is connected with the power change modules, the main control circuit comprises a voltage detection unit and a current detection unit, through detecting the voltage and the current values of the direct current power and comparing with a predetermined value, the work of the power module is controlled. The novel renewable energy generation feedback system has low cost, high reliability, high conversion efficiency and low harmonic content.

Description

Technical field: [0001] The invention relates to a novel renewable energy power generation feedback system, in particular to a renewable energy power generation converter. Background technique: [0002] The power generation and utilization of renewable energy such as wind power, solar power, and tidal power have attracted more and more attention. The general characteristics of these new energy power generation systems are scattered power generation equipment, small single-unit capacity, wide distribution area, and unstable output voltage and current. How to convert the power generated by these renewable energy power generation 1. The three-phase electricity used directly by civilians is an urgent problem in my country and the world. [0003] At present, the most adopted schemes for wind power generation equipment are: ①Adopt AC excitation wire-wound rotor doubly-fed motor with variable speed and constant frequency wind power generation system. The power converter located on...

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Problems solved by technology

The frequency converter of this scheme only handles the slip power, and the general rated power is about one-third of the generator capacity, and it is also a low-voltage converter, so the cost and volume of the converter are greatly reduced, but the problems of this scheme Yes, because the generator adopts a wire-wound rotor and is excited by the slip ring, the volume and cost of the generator increase. Due to the use of the slip ring, the failure rate of the generator is high and the maintenance cost is high.

In essence, the solution is to remove the rectification part of the general-purpose inverter and use the full-control high-power semiconductor device IGBT or IGCT, and need to use a large number of electrolytic capacitors. Similarly, the cost of the converter is high, and the reliability is also low. Difficult to guarantee

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