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Flexible DC power transmission converter valve sub-module switching frequency optimization method and control system

A technology of flexible DC power transmission and switching frequency, which is applied in the direction of converting AC power input to DC power output, high-efficiency power electronic conversion, and output power conversion devices. It can solve problems such as fluctuations in sub-module voltage correction factors, and reduce losses. Effects of improving efficiency and reducing turn-on and turn-off frequencies

Active Publication Date: 2017-12-29
XUJI GRP +3
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AI Technical Summary

Problems solved by technology

Although this method can reduce the switching frequency of the sub-modules, it will cause fluctuations in the correction factors of the sub-module voltages, and it will be frequently turned on and off according to the results of the voltage sorting when the voltage difference of the sub-modules is small.

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  • Flexible DC power transmission converter valve sub-module switching frequency optimization method and control system

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Embodiment Construction

[0023] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0024] In the flexible DC transmission system, the converter valve is the core equipment to realize AC-DC conversion, and the sub-module is the basic unit of the converter valve. Each bridge arm of the converter valve is composed of several sub-modules connected in series. All sub-modules are turned on and off according to the control instructions of the converter valve control device (valve control), thereby realizing the AC-DC conversion of the entire converter valve. Since the on-off loss of the sub-module is the main source of its own loss, reducing the switching frequency of the sub-module is an important way to reduce the loss of the sub-module and reduce the loss of the converter valve.

[0025] Aiming at the problem of high switching frequency in the control process of the converter valve sub-module, the present invention proposes a ...

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Abstract

The invention relates to a flexible DC power transmission converter valve sub-module switching frequency optimization method and a control system, wherein the method and the system belong to the field of power system flexible DC power transmission technology. The method comprises the steps of firstly acquiring voltage of all sub-modules in each leg of the converter valve; then determining whether the voltage of each sub-module in the leg is in a preset range, if yes, changing the state of k sub-modules with lowest switching frequency in the leg, wherein k is the number of sub-modules which require to be inputted; and otherwise, controlling the state of the sub-module according to the voltage amplitude sequence and current direction of the sub-modules in the leg, and selecting the same number of sub-modules with lowest switching frequency in the sub-modules which are kept unchanged for being switching-off or switched-on. Under a precondition that voltage unbalance degree of the flexible DC power transmission converter valve sub-module is ensured, the method and the system according to the invention greatly reduce switching frequency of the sub-module, thereby reducing loss of the converter valve and improving efficiency in flexible DC power transmission.

Description

technical field [0001] The invention relates to a switching frequency optimization method and a control system for a converter valve sub-module of a flexible direct current transmission, belonging to the technical field of flexible direct current transmission of electric power systems. Background technique [0002] Modular multilevel flexible direct current transmission (MMC-HVDC) is a new generation of direct current transmission technology, and flexible direct current transmission is a direct current transmission based on a voltage source. The voltage polarity of the direct current line is unchanged, so it is very easy to form a multi-terminal direct current Power transmission, which can directly supply power to small isolated loads over long distances, especially passive systems. The switching frequency of the converter valve sub-module of the flexible HVDC transmission is a key factor affecting the overall loss of the converter valve. At present, the pressure equalizati...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02J3/36
CPCH02J3/36H02M7/219H02M1/0048Y02B70/10Y02E60/60
Inventor 俎立峰胡四全董朝阳吉攀攀李坤冯敏马俊杰
Owner XUJI GRP
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