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Method and system for controlling network-side converter

A technology of grid-side converter and control method, which is applied in the direction of single-grid parallel feeding arrangement, etc., can solve the problems of multiple hardware equipment, high maintenance cost, and high cost of hardware sensor method detection.

Inactive Publication Date: 2011-05-11
SEARI ELECTRIC TECH
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Problems solved by technology

The detection cost of the hardware sensor method is relatively high, and more hardware devices will be used, and the maintenance cost is relatively high

Method used

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  • Method and system for controlling network-side converter
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  • Method and system for controlling network-side converter

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Embodiment Construction

[0049] refer to figure 1 As shown, the present invention discloses a control system of a grid-side converter. The control system of the grid-side converter includes: a signal acquisition device 100, an A / D converter 102, a 3s / 2r coordinate transformation device 104, a virtual Grid flux linkage angle observer 106 , rotating coordinate transformation device 108 , current inner loop controller 110 , stationary coordinate transformation device 112 , space voltage pulse width modulation device 114 , and drive circuit 116 .

[0050] The signal acquisition device 100 detects the three-phase current i on the AC side of the grid-side converter through the Hall sensor ga i gb and i gc , where the three-phase current i ga i gb and i gc is an analog signal.

[0051] The A / D converter 102 is connected to the signal acquisition device 100, and performs A / D conversion on the analog signal to obtain the three-phase current i ga i gb and i gc digital signal.

[0052] The 3s / 2r coordi...

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Abstract

The invention discloses a method and a system for controlling a network-side converter. A power grid voltage is taken as a differential of a virtual flux linkage by using a virtual power grid flux linkage angle observer; a virtual power grid flux linkage is observed by an observing method similar to that of the flux linkage of an alternating current motor for replacing the power grid voltage to serve as an oriented vector; and a power grid orientation angle is obtained by using the virtual power grid flux linkage angle observer. By the method and the system, partial parameters are calculated by software by using the virtual power grid flux linkage angle observer, a control strategy is decoupled by using a vector oriented by a d axis virtual power grid flux linkage, and four quadrant operation is realized; and related electricity parameters are acquired by the virtual power grid flux linkage angle observer, and a virtual power grid flux linkage angle is observed by a software algorithm. The observation accuracy of a virtual power grid flux linkage observer can be improved by adding initial flux linkage estimation, and the impact of a starting current can be effectively restrained, so that the conventional method for using a hardware voltage sensor is replaced. By the method and the system, the reliability and anti-interference performance of the network-side converter are improved, and hardware cost is lowered.

Description

technical field [0001] The present invention relates to new energy technology, and more specifically, relates to a control method and a control system for a grid-side converter in a wind power generation system. Background technique [0002] The PWM rectifier can realize the sinusoidalization of grid-side current, the power factor can be controlled, and the energy can be transmitted bidirectionally, which not only saves energy, but also reduces grid pollution. Seriously, it has important research significance today. [0003] With the continuous deepening of the research on the control strategy of PWM rectifiers, the problems caused by many sensors are becoming more and more obvious, which not only increases the cost, but also reduces the reliability of the system, especially in the harsh field environment. Control has a negative effect. This makes it one of the current research hotspots to reduce the number of sensors used without affecting the system control performance. ...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 张瑛张扬柴熠李长乐徐志武夏伟杨浩然董立骏
Owner SEARI ELECTRIC TECH
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