Modulation method of inverter and use thereof

A modulation method and inverter technology, which are applied in the direction of converting AC power input into DC power output, output power conversion devices, electrical components, etc. frequency, current ripple reduction, size reduction effect

Active Publication Date: 2013-01-02
爱士惟电力设备贸易(上海)有限公司
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Problems solved by technology

[0003] However, this design method requires a current sharing reactor to balance the current of parallel power devices
The power devices connected in parallel act in the same way, and the switching times of the switches cannot be fully utilized to increase the switching frequency

Method used

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  • Modulation method of inverter and use thereof
  • Modulation method of inverter and use thereof
  • Modulation method of inverter and use thereof

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Embodiment Construction

[0015] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0016] The topologies targeted in this patent are figure 1 As shown, two three-phase half-bridges connected in parallel are used, and each half-bridge includes three-phase bridge arms. The SVPWM method is used to modulate and control the switches in each phase bridge arm separately, and the switches in each phase bridge arm are assigned different The duty cycle and action sequence finally make the two three-phase half-bridges output alternately in each PWM control cycle, thereby reducing the output current ripple.

[0017] In the present invention, the target vector is calculated by using the SVPWM general calculation method, and the sector is de...

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Abstract

The invention discloses a modulation method of an inverter and a use thereof. The modulation method of the inverter is applied to inverter topology in a parallel structure, and comprises two parallel three-phase half-bridges, and each three-phase half-bridge comprises a three-phase bridge arm. The method comprises the steps of: modulating by an SVPWM (Space Vector Pulse Width Modulation) method and respectively controlling a switch of each three-phase bridge arm; distributing different duty cycles and sequences of operation; and finally outputting each PWM (Pulse-Width Modulation) control period of two three-phase half-bridges alternately so as to reduce the output current ripple. The method further comprises the steps of: calculating to obtain a target vector and determining a sector according to a rotation angle of the target vector on a coordinate system; further determining the action times T1 and T2 of adjacent natural vectors and zero vector action time T0; and finally determining the duty cycle and sequence of operation of the switch in each phase bridge arm. With the adoption of the system, the modulation method of the inverter and the use thereof have the advantages that a current-sharing reactor can be omitted, and the cost is lowered; and the equivalent switching frequency is increased, the current ripple is reduced, and the size of a rear end LCL filter is reduced.

Description

technical field [0001] The invention relates to an inverter modulation method and its application. Background technique [0002] In the design of high-power inverters, in order to expand the power level, two three-phase half-bridge inverter structures are often connected in parallel. Each inverter bridge is given the same control signal and connected in parallel through a current-sharing reactor. [0003] However, this design method requires a current sharing reactor to balance the current of the parallel power devices. The power devices connected in parallel act in the same way, and the switching times of the switches cannot be fully utilized to increase the switching frequency. Contents of the invention [0004] The invention provides an inverter modulation method, which can make full use of the switching times of the switching tube, cancel the current sharing reactor and increase the equivalent switching frequency. [0005] The invention discloses an inverter modulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5395H02M1/12
Inventor 白志峰吴国瑞孙耀杰
Owner 爱士惟电力设备贸易(上海)有限公司
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