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Modular multilevel converter voltage-sharing control method

A modular multi-level, voltage equalization control technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problems of multi-control time and consumption, and improve engineering efficiency , Reduce data traffic, reduce the effect of time occupied

Active Publication Date: 2016-03-02
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

When the value of N becomes larger, the number of capacitor voltages to be collected will increase correspondingly, and the requirements for the control cycle will also be higher: in a real-time simulator (RealTimeDigitalSimulation, RTDS), using optical fiber to transmit the capacitor voltage of 512 sub-modules takes time. 4 small steps with a total period of about 10us; in actual engineering, the voltage equalization control needs to collect the capacitor voltages of the sub-modules arranged in series and then merge them together for sorting, which will also consume more control time

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Embodiment Construction

[0025] The present invention proposes a voltage equalization control method for a modularized multilevel converter. The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] figure 1 Shown is a flow chart of a voltage equalization control method for a modular multilevel converter, including the following steps:

[0027] 1) According to the different conditions of whether the sub-modules are pre-charged when the modular multi-level converter is started, initialize the capacitor voltage values ​​of all sub-modules inside the voltage equalization controller; when the sub-modules are not charged, The capacitor voltages of all sub-modules are initialized to 0; when the sub-modules have been precharged to the rated value, the capacitor voltages of all the sub-modules inside the voltage equalizing controller are initialized to the rated value U cref ;

[0028] 2) Collect the bridge arm current of each ph...

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Abstract

The invention discloses a modular multilevel converter (MMC) voltage-sharing control method, belonging to the capacitance voltage control technical field. The method comprises: initializing capacitance voltage values of all sub modules in a voltage-sharing controller; collecting the bridge arm current of each phase of a MMC, utilizing the voltage and current relation of capacitors to perform differencing to obtain the capacitance voltage change values of all the sub modules in each control period, and correcting the capacitance voltage of all sub modules in the voltage-sharing controller; collecting a small amount of capacitance voltages to obtain the error between a capacitance voltage storage value in the voltage-sharing controller and a capacitance voltage collection value, and correcting the capacitance voltage of all sub modules in the voltage-sharing controller again. The method realizes MMC voltage-sharing control through collecting bridge arm current and a small amount of capacitance voltages, can avoid real time collection of a great amount of sub module capacitance voltages, and guarantee voltage-sharing control effects, and provides a feasible solution for reducing data traffic in practical voltage-sharing control, and improving engineering efficiency.

Description

technical field [0001] The invention belongs to the technical field of capacitor voltage control, and in particular relates to a voltage equalization control method for a modularized multilevel converter. Background technique [0002] With the development of voltage source converter (voltage source converter, VSC) and pulse width modulation technology, HVDC transmission technology has received more and more attention, and can be widely used in low-power transmission, renewable energy grid connection and passive Network powered. However, VSC usually adopts a 2-level or 3-level topology, which has disadvantages such as difficult dynamic voltage equalization and high switching frequency. Modular multilevel converter (MMC), as a new type of voltage source converter, has received more and more attention in research at home and abroad. Each bridge arm of the MMC is composed of multiple modular sub-modules and bridge arm inductors in series, and multi-level superposition output i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 郭琦王嘉钰林雪华李岩刘崇茹
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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