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Parallel system of 2N inverters and control method of parallel system

A control method and inverter technology, applied in the field of power electronics, can solve the problems of coupled inductance and zero common-mode modulation that cannot be extended to multiple inverter parallel systems, so as to reduce the design volume and weight, and reduce the maximum saturation The effect of high magnetic density and power density

Active Publication Date: 2019-08-27
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide a 2N inverter parallel system and its control method, aiming to solve the problem that the coupled inductance and zero common mode modulation cannot be extended to multiple inverter parallel systems

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[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0046] The present invention provides a parallel connection system of 2N inverters, including: N inverter units and 3N independent inductors; the inverter unit includes a first inverter, a second inverter, a coupled inductor a , coupled inductance b and coupled inductance c;

[0047] One opposite end of the coupled inductance a is connected to phase a of the first inverter and the second inverter, and the other end of the opposite end is connected in parallel to the input end of an independent inductance a;

[0048] One opposite end of the coupled inductance b is connected to phase b of the first ...

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Abstract

The invention discloses a parallel system of 2N inverters and a control method of the parallel system. A dotted end of a coupling inductor a is connected with phases a of a first inverter and a secondinverter, the other dotted end of the coupling inductor a is connected with an input end of an independent inductor a, similarly, a coupling inductor b is connected with a coupling inductor c, outputends of same independent inductors are connected in parallel, each independent inductor is used for suppressing a ring current between the inverters, and each coupling inductor is used for suppressing a ring current in each inverter unit. On the basis of the inverter parallel systems, the control method comprises the steps of calculating a rising edge and a descending edge of switch pulse according to synchronous sawtooth carrer and a pulse phase-shift angle, and acquiring a PWM signal; and achieving control of a parallel structure of the 2N inverters by the PWM signal. The ring current of the 2N inverters is suppressed by combining advantages of the coupling inductors and the independent inductors, and expansion and control of the coupling inductor-based inverter parallel system are achieved.

Description

technical field [0001] The invention belongs to the field of power electronics, and more specifically relates to a parallel connection system of 2N inverters and a control method thereof. Background technique [0002] Voltage source inverters are widely used in many power conversion applications and are often run in parallel for higher output currents, effectively increasing the system power rating. Parallel inverters have a high degree of modularity and are suitable for fault-tolerant technology to ensure system reliability. Interleaved pulse width modulation has the ability to reduce the line current harmonics and the loss of passive devices, and it has been paid more and more attention by people. In addition, zero common-mode modulation based on two inverter parallel systems can theoretically achieve zero common-mode voltage, and can significantly suppress system common-mode current and common-mode EMI. When using interleaved PWM or zero common-mode modulation, the arti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/5395H02M1/32H02M1/12
CPCH02M1/12H02M1/32H02M7/48H02M7/493H02M7/5395H02M1/123
Inventor 蒋栋李桥张野驰沈泽微
Owner HUAZHONG UNIV OF SCI & TECH
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