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Renewable energy feed-back parallel network circuit and its control device

A renewable energy and circuit technology, which is applied in circuit devices, AC network circuits, output power conversion devices, etc. The effect of high efficiency, high power factor and reliable operation

Active Publication Date: 2006-12-27
XINFENGGUANG ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the above technologies, the present invention provides a renewable energy feedback grid-connected circuit and its control device to solve the deficiencies of low operating efficiency and high input cost in the existing renewable energy system, with reliable operation and good performance , high grid-side power factor and low current total harmonics (THD), it belongs to a "green" power electronic conversion technology in today's world

Method used

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  • Renewable energy feed-back parallel network circuit and its control device
  • Renewable energy feed-back parallel network circuit and its control device
  • Renewable energy feed-back parallel network circuit and its control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 Shown is a grid-connected circuit diagram of a renewable energy feedback grid-connected diode clamped three-level circuit. Its specific structure is: an absorption filter circuit 3 composed of C1 and C2 in series is connected in parallel between the positive and negative bus bars of the external input DC power supply Vdc, and a group of three-level circuits are connected in parallel between the positive and negative bus bars behind the absorption filter circuit 3 2. After the midpoint of the clamping diode of each phase of the three-level circuit 2 is connected, it is connected to the middle of the filter absorption circuit 3, and the midpoint of the series connection of the power device 1 of each phase passes through a current sharing inductance L and the output AC R, S, T are connected.

Embodiment 2

[0023] Such as figure 2 As shown, it is a renewable energy feedback grid-connected circuit diagram of a three-level circuit multi-unit parallel connection when large capacity is required. Its specific structure is as follows: the external input DC power supply Vdc is delivered to the power unit 4-1, and the power unit 4-1 passes through the current equalizing inductor L1 to output the alternating current R, S, T; similarly, the external input DC power supply Vdc is delivered to the power unit 4-2 , the power unit 4-2 passes through the current sharing inductance L2 to the output AC R, S, T; there are 1 input DC power supply, n power units, and n current sharing inductances to form n identical power circuits, all of which are identical to the final Output alternating current R, S, T phase connection. The external input of these n identical power circuits is the same direct current Vdc; the n circuits are respectively connected in parallel and then connected to the output alte...

Embodiment 3

[0025] Such as image 3 Shown is the control device of the renewable energy feedback grid-connected circuit of the present invention. Its specific structure is: the bus voltage given signal 11 is transmitted to the voltage regulator 12, the voltage regulator 12 transmits the output signal to the current regulator 13, the current regulator 13 transmits the output signal to the PWM signal generating circuit 14, and the PWM signal is generated The circuit 14 transmits the PWM wave signal to the renewable energy feedback grid-connected circuit 15, and the renewable energy feedback grid-connected circuit 15 converts direct current into alternating current and directly feeds back to the grid 19 through the current equalization and circulation suppression circuit 16. A current sampling circuit 17 and a voltage sampling and synchronous signal generating circuit 18 are arranged between the circuit 16 and the grid 19. The current sampling circuit 17 feeds back the current sampling signa...

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Abstract

The related renewable energy feedback interconnected circuit comprises: the input dc, a power unit with an absorption filter and level circuit in turns all paralleled between positive and negative bus-bar, an equalizing inductance, and the output ac. This invention can improve running efficiency, reduces cost, and has high power factor fit to wide application.

Description

(1) Technical field [0001] The invention relates to a renewable energy feedback grid-connected circuit and a control device for the above-mentioned feedback grid-connected circuit. Power filter, unified power flow controller, superconducting energy storage, new UPS and grid-connected power generation of renewable energy such as solar energy and wind energy, etc. (2) Background technology [0002] In the prior art, methods for dealing with renewable energy generally include supercapacitor energy storage, electromagnetic bearing flywheel energy storage, pure resistance consumption, and feedback grid-connected methods. For high-power renewable energy systems, supercapacitor energy storage has disadvantages such as large investment costs and high maintenance costs; electromagnetic bearing flywheel energy storage is still in the laboratory stage, and there may be certain technical difficulties; pure resistance energy consumption braking structure is simple, The operation is reli...

Claims

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Application Information

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IPC IPC(8): H02M7/537H02M1/14H02J3/00
Inventor 李瑞来胡顺全
Owner XINFENGGUANG ELECTRONICS TECH CO LTD
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