Modular multilevel converter modulation method based on double queues

A modular multi-level, modulation method technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc., can solve the potential risk of increasing system instability and increase the time occupied , reduce the switching frequency of sub-modules, etc.

Inactive Publication Date: 2013-12-04
ZHEJIANG UNIV
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Problems solved by technology

Although this strategy can greatly reduce the switching frequency of sub-modules and avoid random switching, it is necessary to sort the sub-modules in the state of switching on or off each time
Especially when the number of sub-modules reaches a certain scale, the time required for sorting will increase greatly in the entire control cycle, which will cause delays in control, reduce the operating stability of the syst...

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  • Modular multilevel converter modulation method based on double queues
  • Modular multilevel converter modulation method based on double queues
  • Modular multilevel converter modulation method based on double queues

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Embodiment Construction

[0097] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0098] Such as figure 1 As shown, a modulation method based on dual-queue modular multilevel converters includes the following steps:

[0099] Step 1: For each bridge arm, establish an input queue and a disconnection queue in the initial state, and store the serial numbers of the submodules in the input and disconnected states in order of voltage from small to large.

[0100] The MMC topology adopts a three-phase six-arm structure, such as figure 2 As shown, each bridge arm is formed by cascading N basic operating power units, and a snubber reactance L is configured at the same time 0 To suppress the rate of rise of circulating current and fault current. u dc is the MMC bipolar DC bus voltage difference. In view of the three-phase rotation symmetry ...

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Abstract

The invention discloses a modular multilevel converter modulation method based on double queues. The method includes: grouping submodules according to on-off status, and sequentially storing the same in an input queue or a remove queue from low voltage to high voltage; selecting number of the to-be-input or to-be-removed submodules according to bridge arm level variation, bridge arm current direction and maximum voltage deviation of the submodules, performing corresponding input and remove operations the selected submodules, and adjusting the two queues. By the method, only the on-off status of the submodules with the largest number or the smallest number in the two queues needs to be changed, switching frequency is kept low, voltage ordering is not required by all submodules, the queues can be adjusted by simple comparison, times and time of comparison required by ordering are reduced, system response speed is increased, and huge engineering application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of electric power system control, and in particular relates to a modulation method of a dual-queue-based modular multilevel converter. Background technique [0002] In 2001, R. Marquardt, a scholar at the Bundeswehr University in Munich, Germany, first proposed a modular multilevel converter (MMC) topology. The bridge arms of this topology adopt the form of cascading basic operating units to avoid a large The switching devices are directly connected in series, and there is no problem such as consistent triggering. However, since the MMC topology disperses and stores energy in the capacitors of each sub-module of the bridge arm, how to perform reasonable modulation in the dynamic process to quickly realize the balance of the capacitor voltage of each sub-module Control, so that the energy is evenly distributed throughout the converter, is one of the difficulties in the realization of the MMC topology. [000...

Claims

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Application Information

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IPC IPC(8): H02M7/483
Inventor 徐政刘高任薛英林许烽
Owner ZHEJIANG UNIV
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