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Modulation method for bidirectional transducer of flow battery energy storage grid-connected system

A technology of a bidirectional converter and modulation method, which is applied in the directions of reducing the asymmetry of the polyphase network, eliminating/reducing the asymmetry of the polyphase network, etc., can solve the problems such as the inability to solve the influence of the power grid

Active Publication Date: 2012-07-04
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the optimal Alesina-Venturini method cannot solve the influence of grid voltage imbalance (amplitude or phase asymmetry), non-sinusoidal waveform, and grid surge (surge and dip) on the output.

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  • Modulation method for bidirectional transducer of flow battery energy storage grid-connected system
  • Modulation method for bidirectional transducer of flow battery energy storage grid-connected system
  • Modulation method for bidirectional transducer of flow battery energy storage grid-connected system

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Embodiment Construction

[0043] The 6 bidirectional power switches in the main circuit of the matrix AC-DC converter have a total of 9 switching states, which are usually represented by a group of 2 letters: (ab), (bc), (ba), (ca), ( cb), (ac), (aa), (bb), (cc). The first bit in ab indicates that the output terminal P of the matrix converter passes through the bidirectional power switch S of the upper bridge arm Pa Connected to the input phase a, the second bit indicates that the output terminal N of the matrix converter passes through the bidirectional power switch S of the lower bridge arm Nb Connect with input phase b. 9 switching states correspond to 6 effective vectors (I 1 , I 2 , I 3 , I 4 , I 5 , I 6 ) and three zero vectors (I 01 , I 02 , I 03 ). The effective vector action connects different input phases to the output terminals to generate an output voltage; the zero vector action connects the same input phase to two output terminals to provide a freewheeling path for the load, an...

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Abstract

The invention discloses a modulation method for a bidirectional transducer of a flow battery energy storage grid-connected system, comprising the steps of computing absolute value of amplitude Ui of an input phase voltage space vector, relative position angle thetai of a sector where an input current space vector is located, voltage modulation coefficient m, duration time Talpha, Tbeta, T0 in sequence; according to m value, using selection of the 1-3 zero-vector switch state to perform selecting according to the principle that only one bidirectional power switch is changed before / after a switching state; finally, modulating sequence and duration time by a commutation control circuit according to a state of the bidirectional power switch to arrange on and off of sixth bidirectional power switches of a matrix converter so as to achieve commutation control. The modulation method is suitable for an abnormal working condition of the input voltage, reduces a narrow pulse condition, reduces current ripple on the output inductance, improves output performance and achieves output of adjustable direct-current voltage in a large range.

Description

technical field [0001] The invention belongs to the technical field of power electronic conversion devices, and in particular relates to a modulation method for a bidirectional converter used in a liquid flow battery energy storage grid-connected system, so as to eliminate the voltage imbalance (amplitude or phase asymmetry) of the three-phase input grid, The impact of non-sinusoidal waveform and power grid surge (sudden rise and drop) on the output DC voltage, reducing the converter output inductor current ripple and narrow pulse phenomenon, to increase the output DC voltage regulation range and obtain excellent The purpose of the output voltage and input current waveforms. Background technique [0002] Energy storage technology has been regarded as an important part of the grid operation process. After the energy storage link is introduced into the system, it can effectively realize the demand side management, eliminate the peak-valley difference between day and night, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 林桦王兴伟冯波安星
Owner HUAZHONG UNIV OF SCI & TECH