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Modular multi-level current converter passivity modeling and control method

A modular multi-level, multi-level converter technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as unsatisfactory effects

Inactive Publication Date: 2014-02-19
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of applying the existing two-level or three-level converter-based voltage, current and power control strategies and controller methods to modular multi-level converters. , a passive modeling and control method for modular multilevel converters is proposed

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  • Modular multi-level current converter passivity modeling and control method
  • Modular multi-level current converter passivity modeling and control method
  • Modular multi-level current converter passivity modeling and control method

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Embodiment Construction

[0093] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0094] Such as figure 1As shown, the modular multilevel converter is connected between the DC grid and the AC grid, wherein the DC grid is composed of two 2250V DC power supplies connected in series, the connection point of the two DC power supplies is grounded, and the frequency of the AC grid is 50Hz, The peak voltage is 1600V. The upper and lower bridge arms of the modular multilevel converter are composed of two half-bridge modules, and each half-bridge consists of four parts: two IGBTs, two anti-parallel diodes, DC-side capacitors, and DC-side equivalent paralle...

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Abstract

The invention discloses a modular multi-level current converter passivity modeling and control method which mainly comprises the following steps: step 1, a modular multi-level current converter passivity mathematic model is established, and an equalization state-space equation within a switching period is obtained; step 2, a modular multi-level current converter energy forming method algorithm model based on the equalization state-space equation is established, and a passive system from an input state variable Xi to an output state variable X is defined; step 3, a current converter damping injection algorithm model is established; step 4, a current converter control model based on all module switching functions is established. The modular multi-level current converter passivity modeling and control method has the advantages that stabilized and balanced control over capacitance and voltages on the direct current sides of upper bridge arms and lower bridges arms and quick tracking control over currents on the alternating current sides of all the bridges arms can be realized rapidly, the defects of a traditional modular multi-level current converter control strategy are overcome, and a feasible means is provided for the design of a control strategy of a flexible direct current transmission system.

Description

technical field [0001] The invention belongs to the technical field of flexible transmission and distribution of power systems, and relates to a modeling and control method of a modular multilevel converter, in particular to a modeling of a modular multilevel converter based on passivity theory and control methods. Background technique [0002] The development of power transmission technology has experienced the technological evolution from DC to AC, and then to the coexistence of AC and DC. The flexible DC transmission technology based on the voltage source converter can solve many problems faced by the current AC and DC transmission field, and provides a new solution for the transformation of power transmission mode and the construction of future smart grid. Since the withstand voltage of fully controlled switching devices (such as insulated gate bipolar transistors (IGBT), etc.) is still relatively low, flexible direct current transmission systems based on two-level or t...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M7/5387
Inventor 韩杨
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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