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Static compensator model prediction control method based on modularized multilevel transverter

A modular multi-level, model predictive control technology, applied in the direction of multi-phase network asymmetry reduction, AC network to reduce harmonics/ripple, multi-phase network elimination/reduction of asymmetry, etc., can solve the capacitor voltage imbalance balance, endangering the normal operation of the converter, etc.

Inactive Publication Date: 2014-04-23
SIEYUAN ELECTRIC CO LTD +2
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Problems solved by technology

[0003] Because each sub-module of MMC is independent, the difference in charge and discharge, loss and capacitance value of each sub-module will make the capacitor voltage unbalanced, which will endanger the normal operation of the converter.
Therefore, the problem of DC side capacitor voltage control of each module is a difficult problem for modular multilevel converters

Method used

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  • Static compensator model prediction control method based on modularized multilevel transverter
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  • Static compensator model prediction control method based on modularized multilevel transverter

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Embodiment

[0099] In order to verify the feasibility of the control method, the inventor built a simulation model of a static compensator based on a modular multilevel converter (MMC-STATCOM) on the PSCAD / EMTDC electromagnetic transient simulation software platform. Number of MMC bridge arm modules N=6, DC side voltage U dc =2400V, sub-module capacitance C=3300μF, bridge arm reactance L 1 = 15mH. Grid rated voltage u s =1400V. For simplicity, the connection resistance and inductance between the power grid and MMC are not considered, that is, R 2 = 0Ω, L 2 = 0 mH. The unbalanced load is an unbalanced load in star connection, A phase is a 5Ω resistor connected in series with a 10mH inductor, B phase is a 10Ω resistor connected in series with a 10mH inductor, and C phase is a 15Ω resistor connected in series with a 10mH inductor. The control period T of the model predictive control algorithm s = 100 μs. In each control cycle, it is necessary to calculate The value function value u...

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Abstract

The invention discloses a static compensator model prediction control method based on a modularized multilevel transverter. A. any one type of switching combination of one phase of the modularized multilevel transverter is selected; B. error values of capacitor voltage of all sub-modules of the phase under the switching combination are calculated; C. the error values of current outputted by a corresponding multilevel transverter AC side are calculated; D. a cost function value is acquired via the error values of the capacitor voltage in the step B and the error values of the current outputted by the multilevel transverter AC side in the step C so that deviation between the output of the corresponding multilevel transverter under the switching combination and a practical control objective is represented; E. another switching combination in the modularized multilevel transverter is selected, and the steps B, C and D are repeated until all the switching combination situations of one phase are completely processed; an F. finally the minimum cost function value and the corresponding switching combination are found, and switch signals are generated according to the switching combination so that switch devices of the sub-modules of the phase are triggered.

Description

technical field [0001] The invention relates to the field of electric power, and more specifically relates to a static compensator model predictive control method based on a modular multilevel converter. Background technique [0002] With the continuous development of the scale of the power system, the requirements for the voltage level and capacity of the flexible alternating current transmission (FACTS) device are also increased. Static compensator (abbreviated as STATCOM) is an important part of FACTS. In order to realize high-voltage and high-power applications, the topology of its converter is divided into two types: low-level number and cascaded multi-level number. The low-level topology adopts the technology of direct series connection of devices, but it brings a series of problems such as dynamic and static voltage equalization and large output harmonics. In the multi-level topology, the multi-level topology using diode or capacitor clamping increases with the numbe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26H02J3/01
CPCY02E40/40Y02E40/50
Inventor 李锦曹穆沈斐王跃丛武龙陈远华李岩
Owner SIEYUAN ELECTRIC CO LTD
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