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Energy replenishing power supply system and control method thereof for MMC valve

A technology of power supply system and control method, which is applied in the field of supplementary power supply system and its control, can solve problems such as excessive oscillation and voltage drop in the adjustment process, and achieve the effects of eliminating oscillation, reducing oscillation, and improving control accuracy

Active Publication Date: 2014-12-17
CHINA EPRI ELECTRIC POWER ENG CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The traditional control method uses the voltage difference between the target voltage and the set voltage as the input of the control system to calculate and generate the adjustment amount. This constant voltage control method will inevitably lead to a voltage drop in the steady-state test, and the oscillation in the adjustment process is too large

Method used

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  • Energy replenishing power supply system and control method thereof for MMC valve
  • Energy replenishing power supply system and control method thereof for MMC valve
  • Energy replenishing power supply system and control method thereof for MMC valve

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Embodiment Construction

[0029] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] The supplementary power supply system of this embodiment is mainly used for figure 1 The structure of the rectification and charging circuit is shown, in which the two ends of the six-pulse rectifier bridge in the box (in the solid box) are connected in parallel with a 400Ω start-up resistor, and a capacitor of 18mF is connected through a diode and a reactor. This capacitor is in the MMC (in the virtual box) Ground the capacitor of the submodule. The rectifier bridge consists of uncontrolled diodes. MMC is composed of multiple sub-modules in series, and its electrical structure is as follows: figure 2 shown. Each sub-module consists of an IGBT module with an H-bridge structure or a half-bridge structure connected in parallel with a capacitor. Both ends of the capacitor are connected in parallel with a voltage ...

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Abstract

The invention discloses an energy replenishing power supply system and a control method thereof for an MMC valve. In the system, the two ends of an energy storage capacitor of a submodule are connected with a rectifier, a diode and a reactor, which are connected in series, to form a loop. The corresponding method comprises the following steps of: 1, collecting the initial voltage of the capacitor and the alternating current side voltage of the rectifier and feeding back to a controller; 2, by the controller, calculating the voltage difference of the initial voltage of the capacitor and the alternating current side voltage of the rectifier, calculating the trigger angle phi1 of the rectifier and outputting the trigger angle phi1 to the rectifier; 3, collecting the voltage of the capacitor and the alternating current side voltage of the rectifier once in a power frequency period and feeding back to the controller; 4, getting the average value of the voltage differences of the voltage of the capacitor and the alternating current side voltage of the rectifier in five power frequency periods, calculating the trigger angle phi2 of the rectifier in the next period, and outputting to the rectifier; and 5, repeating steps 1 to 4 until the test is over.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an energy supplementary power supply system for an MMC valve and a control method thereof. Background technique [0002] Flexible direct current transmission (VSC-HVDC) technology has broad application prospects in the field of high-voltage direct current transmission. VSC-HVDC based on modular multilevel converter (MMC) is a way to realize direct current transmission using IGBT valves , and its core component is called MMC valve. [0003] The purpose of the steady-state operation test of the MMC valve is to investigate the tolerance of the valve assembly to key stresses such as current, voltage and temperature under long-term actual operating conditions, which is also an important part of the research on the reliability of the converter operation. Among the key stresses investigated, voltage stress and current stress are not single AC variables or DC quant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/06
Inventor 高冲魏晓光吴亚楠罗湘谢敏华
Owner CHINA EPRI ELECTRIC POWER ENG CO LTD
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