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A parallel system of 2n inverters and its control method

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 achieve high power density , The effect of reducing the maximum saturation flux density

Active Publication Date: 2020-09-18
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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  • A parallel system of 2n inverters and its control method
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  • A parallel system of 2n inverters and its control method

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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 connection system and control method of 2N inverters. One of the coupling inductance a with a different name is connected with phase a of the first inverter and the second inverter, and the other with a different name The terminals are connected in parallel with the input end of an independent inductance a; by analogy, the connection relationship between the coupled inductance b and the coupled inductance c; the output terminals of the same independent inductance are connected in parallel; the independent inductances are used to suppress the inverter unit The circulating current between them; the coupled inductors are used to suppress the circulating current in each inverter unit. Based on the above-mentioned inverter parallel system, the control method of the present invention includes: calculating the rising edge and falling edge of the switching pulse according to the synchronous sawtooth carrier wave and the pulse phase shift angle, and obtaining the PWM signal; realizing the control of 2N inverters through the PWM signal Control of parallel structures. The invention combines the advantages of the coupled inductance and the independent inductance to suppress the circulating current of 2N inverters, and realizes the expansion and control of the inverter parallel system based on the coupled inductance.

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 Patents(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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