Carrier phase shift based control system modeling method for modular multilevel converter (MMC)

A modular multi-level, carrier phase shift technology, applied in the fields of instruments, electrical digital data processing, special data processing applications, etc. Avoiding dimensional conversion work, avoiding dimensional conversion work, effect of reliable data communication

Active Publication Date: 2015-08-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the existing "data merge" and "data extract" modules in PSCAD can handle very limited signal dimensions, the "single-dimensional and multi-dimensional" bidirectional conversion of a large number of control signals between the primary system and the control system is performed using existing resources work is very difficult

Method used

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  • Carrier phase shift based control system modeling method for modular multilevel converter (MMC)
  • Carrier phase shift based control system modeling method for modular multilevel converter (MMC)
  • Carrier phase shift based control system modeling method for modular multilevel converter (MMC)

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Embodiment 1

[0035] In this embodiment, a CPS-SPWM-based MMC control system designed in a PSCAD environment is used to illustrate the modeling method of the present invention.

[0036] Step 1: Divide the MMC packaging control system based on CPS-SPWM into 4 packaging control modules, namely power control module, balance control module, carrier module and trigger module.

[0037] The signal interaction between the primary system and the secondary system of the existing MMC is as attached figure 1 Shown. Among them, the subscript i=A,B,C, indicating three-phase ABC; j=u or l, indicating the upper bridge arm or the lower bridge arm, respectively; k=1,2,...,N, indicating the number of the bridge arm neutron module . The meanings of the subscripts i, j and k in the present invention are the same as here.

[0038] Attached figure 1 The primary MMC system includes 6 MMC equivalent bridge arm models, and its main parameters include the number of sub-modules in a bridge arm N and the sub-module capacita...

Embodiment 2

[0061] This embodiment uses a three-terminal MMC-HVDC system to verify the dynamic characteristics of the package control system established according to the method of the present invention. As attached Figure 4 As shown, MMC has 100 sub-modules in each bridge arm, and the DC voltage is 200kV. The resistance and inductance of the DC transmission line are 0.15Ω and 25mH. MMC 1 And MMC 2 Access active AC system U s1 And U s2 In, where U s1 = U s2 =110kV, X L =j3.14Ω. MMC 3 Supply power to passive AC loads, where Z Load =(363.0+j121.0)Ω. The capacitance in each sub-module is 3mF, and the bridge arm inductance is 40mH. MMC 1 And MMC 2 use image 3 The d-q decoupling controller shown and MMC 3 Using M-δ controller. MMC 1 Use constant active and reactive power control, where P ref = 100MW, Q ref = 30Mvar. MMC 2 Adopt constant DC voltage and reactive power control, where U dcref =200kV, Q ref = 10Mvar. MMC 3 Use constant AC voltage amplitude control, where U sref = 89.8kV. ...

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Abstract

The invention belongs to the technical field of the operation and control of power systems and particularly relates to a carrier phase shift based control system modeling method for a modular multilevel converter (MMC). According to the carrier phase shift based control system modeling method, an MMC control system based on a CPS-SPWM (Carrier Phase Shifted-Sinusoidal Pulse Widen Modulation) method is divided into four encapsulated control modules, the original control element in each control module is converted into an equivalent control subfunction by using a discrete time domain algorithm, and a large number of control element duplicating work is avoided through repeatedly calling the equivalent control subfunctions; through designing signal interfaces and parameter filling cards of the encapsulated control modules, a large number of control signal dimension converting work in the original modeling process is avoided; in addition, subfunction files compiled by external Fortran can be encrypted through .obj files; each encapsulated module can be used for effectively meeting the requirements on specific control effect and can also be used for reliably realizing the communication of a large amount of data, so that a large number of data signal dimension converting work in the original modeling method is avoided.

Description

Technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a method for modeling a control system of a modular multilevel converter based on carrier phase shift. Background technique [0002] Modular multilevel converter (MMC) is a new type of voltage source converter (VSC) topology. The MMC based on the sub-module cascade structure has many advantages, such as reducing the switching frequency and switching loss while maintaining a higher equivalent switching frequency of the bridge arm, it does not involve the consistency of the direct series switching elements and the output AC waveform has high quality . Therefore, MMC is very promising in high-voltage and large-capacity transmission of electric energy and electric drive applications. The flexible straightening systems based on MMC technology that are under construction or have been put into use in my country include Dalian 4-terminal flexible strai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 刘崇茹李海峰洪国巍田鹏飞王嘉钰李庚银
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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