Control method for three-phase PWM rectifier for grid voltage waveform distortion

A grid voltage and waveform distortion technology, applied to the AC network to reduce harmonics/ripples, convert AC power input to DC power output, electrical components, etc., can solve problems such as grid current distortion, and achieve grid voltage waveform distortion suppression , to achieve a simple effect without stability problems

Active Publication Date: 2018-06-08
西安翌飞核能装备股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of grid-connected current distortion under the condition of grid voltage waveform distortion, and at the same time hope to achieve stable and high-performance operation under the condition of maximum grid voltage distortion

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Embodiment Construction

[0020] Below in conjunction with specific embodiment and accompanying drawing, the present invention is described in further detail:

[0021] like figure 1 The PWM rectifier topology is shown: the DC side uses electrolytic capacitors for bus voltage support, the converter uses voltage-type inverters, and the grid side uses LCL filtering to connect to the grid. Unity power factor and parallel are achieved through effective control. Sinusoidalization of grid currents.

[0022] The control method of the three-phase PWM rectifier of the present invention realizes as figure 2 shown.

[0023] a. Sample the instantaneous values ​​Ua(t), Ub(t), and Uc(t) of the three-phase grid voltage, and use the soft phase-locking algorithm to phase-lock the phase angle of the grid to obtain the grid angle φ. .

[0024] b. Bus voltage loop, because it is DC target quantity control, the conventional PI regulator is used for closed-loop control of bus voltage.

[0025] Adopt anti-integral windu...

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Abstract

The invention discloses a control method for a three-phase PWM rectifier for grid voltage waveform distortion. The method is characterized in that feedforward control of grid voltage harmonic components is carried out. The method specifically comprises the following steps of detecting an instantaneous value of three-phase grid voltage; extracting a needed single harmonic by utilizing an instantaneous power conversion algorithm in order to obtain an alternating current instantaneous value of each harmonic in the grid voltage, wherein the harmonic can be flexibly selected according to the fieldcondition; and multiplying the alternating current instantaneous value of each harmonic by an amplitude correction coefficient, feeding forwarding to a control loop, and carrying out feedforward control. The method has the advantages that the implementation is simple, a stability problem is avoided, and the frequency deviation is not affected, and meanwhile, the maximum grid voltage waveform distortion can be inhibited, and compared with other control methods, the method has considerable application prospect.

Description

technical field [0001] The invention belongs to the field of power electronic control and relates to a control method of a PWM rectifier. Background technique [0002] Because of its characteristics of realizing unity power factor and current sinusoidal, PWM rectifiers have more and more obvious advantages over uncontrolled rectification or half-controlled rectification as the cost of fully-controlled semiconductor tubes gradually decreases. With the development of the economy, the increase of sensitive loads in the power grid, whether it is the power transmission end or the power consumption end, has higher requirements on the quality of the power grid. In this regard, the promotion of PWM rectifiers has been further promoted. [0003] However, PWM rectifiers also have some problems. For example, in the case of grid voltage waveform distortion, due to the limited bandwidth and poor robustness of high-power PWM rectifiers, the grid-connected current will be distorted, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02M7/219
CPCH02J3/01H02M7/219Y02E40/40
Inventor 苏伟锋
Owner 西安翌飞核能装备股份有限公司
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