Control method of back-to-back current source converter

A control method and converter technology, applied in the field of electrical systems, can solve the problems of increasing the number of continuous switching of a single device, heat dissipation failure, uneven power distribution, etc., and achieve the effects of good suppression effect, reduced insulation requirements, and wide operating range.

Active Publication Date: 2021-04-27
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

However, this common-mode voltage suppression method based on the traditional three-phase system can only bring a suppression effect of 50% at most in princ

Method used

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  • Control method of back-to-back current source converter
  • Control method of back-to-back current source converter
  • Control method of back-to-back current source converter

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Embodiment Construction

[0044] 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. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0045] In order to illustrate the effects of the present invention, the method of the present invention will be described in detail below taking the water turbine regulating system as the implementation object of the present invention. Among them, the schematic diagram of the water turbine regulating system is as follows: Figure 1a shown. The flow of the method provided in this application is ...

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Abstract

The invention discloses a control method of a back-to-back current source converter, belongs to the field of electrical systems, and aims at a frequency converter scheme adopting back-to-back series current source converter topology and the like, and adopts a method of a central controller to carry out coordination control on current source converters on a rectification side and an inversion side. Stability of the system is improved, the utilization rate of direct-current bus current is improved, and loss of direct-current side reactance is reduced; besides, when space vector modulation is adopted, five-segment SVM modulation for cutting small vectors is completed by optimizing zero vectors, the maximum value of the common-mode voltage on each side is kept to be half of the original value, and according to the relation between the working sectors of the current source converters on the two sides, vector sorting during driving signal wave sending is switched. The method can suppress the common-mode voltage of the system, and the common-mode voltage is reduced by more than half of that of a traditional method; and meanwhile, the insulation requirement on a load side common-mode loop can be reduced, and power density is improved while the size of the direct-current side common-mode reactor is reduced.

Description

technical field [0001] The invention belongs to the field of electrical systems, and more specifically relates to a control method for a back-to-back current source converter. Background technique [0002] With the rapid development of power electronics technology, not only the voltage source converter (VSC) has been popularized, but the current source converter (CSC) is also used in photovoltaic grid-connected power generation because of its better life and boosting capability. , HVDC transmission, wind power and many other fields have high application potential. But it is the same as the voltage source converter, due to the action of the switching device, there is also a problem of common mode voltage (CMV) in the process of operation. Excessive common-mode voltage will threaten the insulation of the system, damage the bearings of the motor load, and interfere with the reliable operation of the system. [0003] In order to solve this problem, isolation transformers, inte...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M1/12
CPCH02M5/4585H02M1/12
Inventor 蒋栋刘康王若栋
Owner HUAZHONG UNIV OF SCI & TECH
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