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Model Predictive Control Strategy for Modular Multilevel Converter

A modular multi-level, model predictive control technology, applied in the conversion of AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as poor harmonic suppression effect of the power grid

Active Publication Date: 2020-04-21
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has poor suppression effect on grid harmonics

Method used

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  • Model Predictive Control Strategy for Modular Multilevel Converter
  • Model Predictive Control Strategy for Modular Multilevel Converter
  • Model Predictive Control Strategy for Modular Multilevel Converter

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Experimental program
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Embodiment Construction

[0046] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0047] figure 1 It is a traditional modular multi-level topology structure. Both the upper and lower bridge arms include N sub-modules, and each phase has a total of 2N sub-modules. Taking phase A as an example, the specific implementation steps of the model predictive control strategy of the present invention are as follows, as image 3 Shown:

[0048]Step 1: Assuming that the modular multilevel converter (MMC) is working in the inverter state, define the active power output by the MMC as p and the reactive power as q. When the grid voltage is oriented, e q = 0, so we can get:

[0049]

[0050] From the above formula, we can see that through i d i q Can separately and independently control the active power and reactive power output from MMC to the grid;

[0051] Step 2: It can be seen from formula (1) that when controlling the MMC output acti...

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Abstract

The invention discloses a model predictive control strategy for a modular multilevel converter. At present, the control strategies adopted for MMC are generally PI control and PR control, and the control effect is not good. The invention controls the working state of each phase sub-module to make the modular multilevel converter output a rated reference value to ensure that the conduction angles of the upper and lower switching power devices in each sub-module are complementary and will not be turned on at the same time; ensure that each The number of sub-modules put into work in the upper and lower bridge arms at each moment of the phase is N; the switch state of each phase sub-module changes optimally each time. The invention increases the prediction period to compensate and corrects the predicted value, realizes the effective control of the modularized multilevel converter, reduces the errors caused by sampling and calculation, and is a highly reliable and practical The optimal control strategy; at the same time, the weight of various factors is considered comprehensively, and the optimal working state of the sub-module is selected.

Description

technical field [0001] The invention belongs to the field of predictive control of electric equipment, and relates to a model predictive control strategy of a modular multilevel converter. Background technique [0002] Modular Multilevel Converter (MMC), such as figure 1 As shown, it has a modular structure, is easy to expand, and has a flexible design. It has a very broad application prospect in the medium and high voltage field. [0003] At present, the control strategy adopted for MMC is generally PI control, PR control and so on. Among them, PI control is a relatively mature technology used in the control of MMC controllers at present, and its working principle is relatively easy to understand, and it has the advantages of easy implementation and strong robustness. However, PI control cannot fully realize error-free tracking in the control of the AC volume in the αβ coordinate system. To achieve error-free tracking, it is necessary to transform the AC quantity in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/007
Inventor 陆翌贾冠龙杨勇王朝亮许烽陈敏唐诵裘鹏宣佳卓陈骞倪晓军丁超
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY