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Controller unit for vsc‑mtdc systems

A controller and system voltage technology, which is applied in the direction of circuit devices, AC network circuits, power transmission AC networks, etc., can solve problems such as complex control design of converters, inability to switch operating modes for coordinated control, and complex PI parameter adjustment.

Active Publication Date: 2017-07-11
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The local control design of the converter is complex, including voltage and current controllers;
[0004] 2. With multiple PI controllers, the adjustment of PI parameters is complicated;
[0005] 3. Coordinated control cannot perform operation mode switching function, and the system reliability is low

Method used

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  • Controller unit for vsc‑mtdc systems
  • Controller unit for vsc‑mtdc systems
  • Controller unit for vsc‑mtdc systems

Examples

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Embodiment Construction

[0086] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0087] The controller device suitable for the VSC-MTDC system provided by the present invention includes: a model building device, a local controller on the rectification side, a local controller on the inverter side, and a coordination controller;

[0088] The model establishment device is used to establish a three-phase VSC mathematical model, such as figure 1 As shown, contains 6 IGBT switches. Among them, there are three bridge arms, and each bridge arm has an IGBT switch on the top and botto...

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PUM

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Abstract

The invention provides a controller device suitable for a VSC-MTDC (voltage source converter-multi-terminal direct current) system. The controller device comprises a rectifier-side local controller used for controlling a current transformer station with a rectification effect in an MTDC power transmission system, an inverter-side local controller used for controlling a current transformer station with an inversion effect in the MTDC power transmission system, and a coordination controller used for coordinating electric power physical parameters such as power, current and the like of each current transformer station in the MTDC power transmission system. The controller device effectively avoids PI (proportional integration) parameter setting and calculation of conventional double closed loop control and greatly lowers the complexity of control on rectification and inversion of current transformers without a linear controller and PWM (pulse width modulation); at the same time, a discrete mathematical model is fully utilized based on a P-DPC (predictive-direct power control) strategy, calculation is simple, and digitization is easy to realize.

Description

technical field [0001] The present invention relates to the field of electrical engineering, in particular to a controller suitable for VSC-MTDC (multi-terminal direct current transmission based on voltage source converter) system, especially based on prediction-direct power (P-DPC) suitable for VSC-MTDC Controller device for MTDC system. Background technique [0002] With the exhaustion of traditional energy sources, new energy sources are attracting more and more attention, and offshore wind power is favored due to its many advantages. At present, the long-distance transmission of large offshore wind farms usually adopts the VSC-HVDC based system. On the basis of double-terminal high-voltage direct current transmission, multi-terminal direct current transmission MTDC technology is gradually perfected and applied. The multi-terminal DC transmission system includes at least 3 or more converter stations. Due to the rapid development of power transmission, the traditional t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 江斌开王志新
Owner SHANGHAI JIAOTONG UNIV
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