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Modular multilevel converter hierarchical control method

A modular multi-level, layered control technology, applied in the field of power systems, to achieve the effect of effective and reliable system balanced and stable operation and stable voltage control

Inactive Publication Date: 2016-10-12
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

On the issue of sub-module capacitor voltage balance control, most patents focus on adjusting the capacitor voltage itself, and do not mention the suppression of capacitor voltage ripple.

Method used

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  • Modular multilevel converter hierarchical control method
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Embodiment Construction

[0029] Below in conjunction with accompanying drawing, the implementation method of the present invention is described in detail: this implementation method is carried out under the condition taking the technical scheme of the present invention as a premise, has provided detailed implementation mode and concrete operation process, but protection scope of the present invention does not Limited to the following examples.

[0030] Such as figure 1 Shown is the topology of the power conversion transmission circuit of the modular multilevel converter. The power transmission system connects the modular multilevel converter and the load through the LCL filter. The modular multilevel converter is composed of three-phase bridge arms, and each bridge arm has 2n sub-modules in series. There is an inductor in series at the current output position. There are 6n sub-modules corresponding to the capacitor voltage, and corresponding to all 6n sub-modules, there are 12n trigger signals conne...

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Abstract

The invention puts forward a modular multilevel converter (MMC) hierarchical control method. On the basis of the existing voltage-current and sub module control method, a current injection ring current suppression structure, a sub module capacitive voltage ripple suppression structure and a predicted composite voltage frequency and amplitude recovery control method are superimposed. Hierarchical control is divided into inner-ring basic control and outer-ring optimized control. The hierarchical control method is applicable to half-bridge sub module, full-bridge sub module and mixed-bridge sub module multilevel circuits. Inner-ring control comprises a voltage and current loop control structure, a sub module capacitive voltage ripple control structure, a ring current injection suppression control structure, and the like. Outer-ring control comprises a droop control structure, a predictive composite control structure, and the like. Ring current injection suppression control, sub module capacitive voltage ripple control and predictive composite control methods are put forward by the invention. The control method of the invention can help improve the stability of a system under different load conditions, improve the quality of output voltage and power of a DC transmission system, reduce the investment cost of a modular multilevel transmission system, and improve the anti-interference ability and rapid response ability of a transmission system.

Description

technical field [0001] The invention relates to a layered control method of a modular multilevel converter in the field of power systems. Background technique [0002] In recent years, with the increasingly serious problems of energy crisis and environmental pollution, countries all over the world are vigorously developing and utilizing clean energy. Modular multilevel converter (Module Multilevel Converter, MMC) technology has been famous for its better output voltage quality, higher capacitance, better electromagnetic compatibility and better fault tolerance since its birth. Widely concerned. Researchers from different countries have successively carried out research on the relevant main circuit, control circuit and electric parameter optimization output. At the same time, because this converter adopts a highly modular structure and has strong scalability, it is widely used. for flexible direct current transmission. [0003] However, the circulating current value in the...

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Application Information

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IPC IPC(8): H02M7/49
CPCH02M7/49
Inventor 韩杨赵玉龙李自鹏杨平熊静琪
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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