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A Method of Circulating Current Detection and Control for Parallel Connection of Inverters

A technology of inverter power supply and control method, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as increased system loss, system collapse, etc. Streaming effects, effects with fast dynamic response performance

Inactive Publication Date: 2018-08-28
XI AN JIAOTONG UNIV
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Problems solved by technology

However, since the inverter outputs a time-varying sine wave, the differences in the frequency, amplitude, and phase of the output voltage of each inverter will introduce circulating currents, which will increase the loss of the system, and even cause the system to collapse in severe cases.

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  • A Method of Circulating Current Detection and Control for Parallel Connection of Inverters
  • A Method of Circulating Current Detection and Control for Parallel Connection of Inverters

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] According to the above detailed introduction of a circulating current detection and control method for parallel inverters, the following takes two 115KVA inverters in parallel as an example to design its control system, and gives the simulation model and simulation results.

[0035] The circulating current detection circuit obtained according to step 1 of the present invention is as follows: figure 2 shown.

[0036] The block diagram of the parallel system control principle after adding the instantaneous circulation suppression sub-module obtained according to step 2 of the present invention is as follows image 3 shown.

[0037] according to figure 1 The system block diagram in and image 3 The principle block diagram in the parallel simulation model of two inverters built on the MATLAB / SIMULINK simulation software is as ...

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Abstract

A circulating current detection and control method for parallel connection of inverter power supplies is realized by a circulating current detection and suppression module of an inverter parallel connection system composed of a circulating current detection circuit submodule and an instantaneous circulating current suppression submodule; the circulating current detection circuit submodule makes each inverter The inverter obtains the circulating current signal locally in real time; the instantaneous circulating current suppression sub-module uses the real-time circulating current to adjust the output of a single inverter controller, so that the output voltages of all inverters are the same, thereby achieving the purpose of effectively suppressing the circulating current; the invention uses Each inverter unit can obtain the circulating current information locally in real time, and suppress the instantaneous circulating current through control, so as to improve the current sharing capability of the inverter and ensure the stable and reliable operation of the parallel system.

Description

technical field [0001] The invention relates to the technical field of inverter parallel control, in particular to a circulating current detection and control method for parallel inverter power supplies. Background technique [0002] As the reliability and system redundancy requirements of the power supply system are getting higher and higher, the inverter parallel technology has become an important technology development direction. [0003] The use of parallel inverter technology can reduce the power supply system's requirements on the capacity and reliability of a single inverter, while improving the scalability and redundancy of the power supply system. However, since the inverters output time-varying sine waves, the differences in the frequency, amplitude, and phase of the output voltages of each inverter will introduce circulating currents, increase system losses, and even cause system collapse in severe cases. Therefore, detecting and suppressing the circulating curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/493
CPCH02M7/493
Inventor 沈传文邱东惠浩浩张博张鹏
Owner XI AN JIAOTONG UNIV
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