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Real-time simulation method for modular multilevel converter

A modular multi-level, real-time simulation technology, applied in the field of power electronics, can solve problems such as high cost and raise the threshold of experimental conditions for modular multi-level converters, avoid errors, and achieve intuitive and convenient programming and development. , the effect of great feasibility

Pending Publication Date: 2019-09-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, most of the existing real-time simulation platforms are expensive, which raises the threshold of experimental conditions for modular multilevel converter research.

Method used

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  • Real-time simulation method for modular multilevel converter
  • Real-time simulation method for modular multilevel converter
  • Real-time simulation method for modular multilevel converter

Examples

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Embodiment Construction

[0034] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0035] The invention provides a real-time simulation method for a modular multilevel converter, comprising the following steps:

[0036] Step 1. Build the circuit model of the MMC bridge arm, and build the control model to carry out simulation testing and verification on the built circuit model. This process is a primary simulation; where, the MMC bridge arm model is as follows: image 3 As shown, it is a three-phase bridge arm, including the MMC sub-module and the bridge arm inductor connected to each bridge arm.

[0037] This example builds a single-ended MMC-HVDC system on the Simulink / SimPowerSystems (SPS) platform. This model belongs to the inverter side and is responsible for converting the input DC bus voltage from DC to AC. The main circuit topology of the inverter side mainly includes MMC bridges Arm model, DC bus voltage source and load componen...

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Abstract

The invention discloses a real-time simulation method for a modular multilevel converter. By using the real-time simulation method, the dynamic characteristics of the current and the voltage can be accurately simulated, and the calculation complexity is low. According to the invention, a backward Euler method is adopted to discretize a bridge arm inductor and an MMC sub-module DC side capacitor, and a single-port network of the MMC sub-module is obtained by means of the Thevenin equivalent theorem, so that an equivalent circuit model of a bridge arm is obtained. The real-time simulation methodcan accurately simulate dynamic characteristics of current and voltage, can greatly reduce the calculation complexity, and can save a large amount of logic resource consumption during hardware simulation. Besides, real-time simulation method builds a simulation model on a System Generator platform in a module assembly connection mode, is more visual and convenient to build the simulation model, compared with traditional programming development, and is more efficient in verification and testing in the early design stage. Moreover, the real-time simulation method realizes simulation of the MMCbridge arm by adopting an FPGA board card on a Vivado platform, can carry out parallel research and development, and can effectively improve the system design operation rate.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a real-time simulation method for a modular multilevel converter. Background technique [0002] Modular multilevel converters have been rapidly developed in the field of flexible DC transmission due to their outstanding advantages such as the ability to achieve arbitrary output levels and low total harmonic content, especially in the fields of large-scale wind power grid integration and grid interconnection. application. However, in the development and commissioning process of the flexible DC transmission system, it is difficult to test the performance and indicators of the transmission system. If all field tests are used for research and development, it will consume a lot of resources and time costs, and it is easily affected by weather and other conditions. It is also a high-voltage network itself, which has potential dangers to researchers, so the weak current syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/39G06F2111/10G06F30/20
Inventor 周治国
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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