Method for starting flexible high-voltage direct-current (HVDC) system of modularized multi-level converter

A modular multi-level, starting method technology, applied in the direction of converting AC power input to DC power output, power transmission AC network, electrical components, etc., can solve the problem of doubling the charging time of the converter and increasing the complexity of the controller design and other problems to achieve the effect of solving charging, simplifying charging control methods, and optimizing modulation algorithms

Active Publication Date: 2011-08-31
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0006] The common disadvantages of the above two sub-module methods are: first, during the charging process of each bridge arm/phase of the converter, only a single sub-module is put into charging. Under the same current limiting resistance, the charging time of the converter Second, whether it is other excitation charging of the DC voltage source or self-excitation charging of the AC sy

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  • Method for starting flexible high-voltage direct-current (HVDC) system of modularized multi-level converter
  • Method for starting flexible high-voltage direct-current (HVDC) system of modularized multi-level converter
  • Method for starting flexible high-voltage direct-current (HVDC) system of modularized multi-level converter

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[0051] The steps in this embodiment are basically the same as those in the first embodiment. The difference is that the steps (1) to (9) can be applied to both the active AC system at both ends, and it is also applicable to the non-active AC system at both ends. Source AC system occasions. When both ends are active AC systems, station 2 can also be used as a DC voltage control station. Accordingly, the control strategies and operations of station 1 and station 2 in the above startup steps should be swapped; when one end is a passive AC system, station 1 It should be located on the active side. Unlike the former, the passive AC voltage control command value in the above control steps (8) and (9) depends on the load requirements of the passive side.

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Abstract

The invention provides a method for starting a flexible HVDC (high-voltage direct-current) system of a modularized multi-level converter, which is utilized to control a switch, a breaker, a converter and the like, so that the submodule voltage and DC voltage are ensured to reach rated values; and control strategies are formulated properly to restrain impulse currents generated in a charging process. By using the method, a charging control method is simplified, a modulation algorithm is optimized, the problem that a far-end converter submodule is short of capacitor voltages when an alternating-current system at one end charges two stations is solved, and the problem of the charging of a DC line is solved as well.

Description

Technical field: [0001] The invention relates to the technical field of flexible direct current transmission in power systems, in particular to a starting method for a modular multilevel converter flexible direct current transmission system. Background technique: [0002] The Modular Multilevel Converter (MMC) used for flexible direct current transmission adopts a new type of multilevel topology that is currently popular in the world. Its core unit - sub-module (Sub Module, SM), such as figure 1 As shown, it is a half-bridge structure composed of two self-turn-off power electronic switching devices with anti-parallel diodes and a capacitor. The basic topology of the novel multilevel topology is as figure 2 As shown, similar to the H-bridge cascaded multi-level structure, it consists of three phase units (Phase Module or Phase Unite, figure 2 1) in the composition, each phase unit includes a vertically symmetrical converter leg (ConverterLeg), and each converter leg is c...

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Application Information

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IPC IPC(8): H02J3/36H02M1/36
CPCY02E60/60H02M2007/4835H02M1/36H02M7/4835
Inventor 汤广福孔明刘栋马巍巍赵岩
Owner CHINA ELECTRIC POWER RES INST
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