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Control structure of full power type AC-DC-AC converter for wind power generation

A technology of AC-DC-AC converter and control structure, which is applied in motor generator control, wind power generation, electronic commutation motor control, etc. It can solve problems such as large loss, large current harmonics, and inability to realize four-quadrant operation.

Active Publication Date: 2009-05-06
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, these two converters use diode rectifiers and thyristor active inverters respectively, which have disadvantages such as relatively large current harmonics, slow dynamic response, large losses, and inability to realize four-quadrant operation.

Method used

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  • Control structure of full power type AC-DC-AC converter for wind power generation
  • Control structure of full power type AC-DC-AC converter for wind power generation
  • Control structure of full power type AC-DC-AC converter for wind power generation

Examples

Experimental program
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Embodiment Construction

[0034] See attached image.

[0035] The control structure of the generator-side converter: the main circuit of the generator-side converter adopts the inverter topology structure in which the uncontrollable rectifier bridge and the PWMDC / AC bridge inverter are connected in series; the inductance L1 and the reactance C1 are mainly used for filtering and the reactive power component of the storage circuit, so that the input current of the inverter is smoother, so as to facilitate the realization of PWM current control; they respectively provide accurate current and voltage sampling signals for DSP; the power module of the charging and discharging main circuit adopts the IPM module, the rectifier bridge The side input AC voltage signal is rectified and smoothed by the inductor L1 and the capacitor C1 to obtain a relatively smooth DC voltage signal; the Hall effect voltage sensor measures the DC bus voltage signal UD, and after A / D conversion leads to the A of the DSP / D pin; the ...

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Abstract

The invention relates to a controller of full-power alternative-direct converter used in wind generation, wherein the alternative-direct converter is formed by network converter and the convert of generator; the used generator is a permanent-magnetic generator; the rotor is in permanent-magnetic structure, without external magnetic activate power supply; two convert loops both uses the PWM converters operating in four quadrants, based on full-control element, which can improve the dynamic response, reduce cost and impact, realize bidirectional transmission of electricity, and realize generating via power factor sine wave current parallel network; and the invention uses improved direct torque technique to control the converter, to confirm the sine wave change of input current at the stator, with quick response, low vibration, torque dynamic control and wide speed adjust range.

Description

technical field [0001] The invention relates to a control structure of a direct drive type AC-DC-AC converter for wind power generation. Background technique [0002] With its advantages of cleanness, no pollution, less land occupation, short construction period, single management, small maintenance workload, and low operating costs, wind power has become one of the important contents of the development of new and renewable energy at home and abroad. Become a key development area of ​​the energy industry. The typical technical solutions in the current advanced wind power generator products are nothing more than two kinds of variable speed double-fed asynchronous wind power generators and gearless variable speed permanent magnet synchronous wind power generators. The frequency converter of variable-speed doubly-fed asynchronous wind turbines has a power of about a quarter of the power of the unit. The total price of the unit is low, but there is a gearbox, and its maintenanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/44H02J3/38H02P21/00H02P21/30
CPCY02E10/763Y02E10/76
Inventor 曹仁贤李维华杨淑英余勇张兴汪东林
Owner SUNGROW POWER SUPPLY CO LTD
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