Design method of converter station controller of flexible direct-current transmission system

A power transmission system, flexible DC technology, applied in the direction of power transmission AC network, etc., can solve the problems of sensitive changes in internal parameters of the converter, long transient process, poor robustness, etc.

Inactive Publication Date: 2013-04-17
SICHUAN EXTREME ELECTRIC CONTROL SYST MFG
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Problems solved by technology

[0004] Most of the controllers of the converters at both ends of the HVDC system that are currently in operation use PI controllers. This design method takes a

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  • Design method of converter station controller of flexible direct-current transmission system
  • Design method of converter station controller of flexible direct-current transmission system
  • Design method of converter station controller of flexible direct-current transmission system

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[0015] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0016] figure 1 Add the principle diagram of passive control to the VSC-HVDC system; since the mathematical model of the VSC-HVDC system is a nonlinear coupling system, the control of the converter becomes complicated. The present invention adopts a passive control method based on the PCHD model. Realize the design of the controller. First, transform the mathematical model of the system into the port controlled dissipation Hamiltonian (PCHD), seek a static state feedback control to make the closed-loop system dynamic PCHD system have a dissipative form, and use the port controlled dissipation Hamiltonian (PCHD) The feedback stabilization of the original understanding of the passive control rate, the following combination of theoretical derivation a...

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Abstract

The invention discloses a design method of a controller of converter stations at the both ends of a flexible direct-current transmission system. A mathematical model of the converter stations at the both ends of the flexible direct-current transmission system is a nonlinear system and has the characteristic of strong coupling which causes certain difficulty to the design of the controller of the converters. According to the invention, with respect to an VSC-HVDC (voltage source converter based high voltage direct current) transmission system, a PCHD (port controlled hamiltonian with dissipation) model is established, and the controller of the converter stations at the both ends of the flexible direct-current transmission system is designed by adopting passive control of interconnection and damping configuration and selecting a proper energy function and a proper damping matrix, thus improving the dynamic and static performance of the controller, and ensuring the relatively strong robustness of the controller.

Description

[0001] 1. technical field [0002] The invention relates to a design method for a converter station controller of a flexible direct current transmission system (VSC-HVDC), which belongs to the technical field of converter station controller design, and is particularly suitable for the design of converter station controllers at both ends of a flexible direct current transmission system. 2. Background technology [0003] Flexible direct current transmission system (VSC-HVDC) is a new type of direct current transmission technology based on voltage source converter (VSC, Voltage Sourced Converter), self-shutdown device (IGBT) and pulse width modulation (PWM). Compared with the technology, VSC-HVDC can supply power to the passive network, without problems such as HVDC commutation failure and reactive power compensation, and can realize independent control of active power and reactive power. [0004] Most of the controllers of the converters at both ends of the HVDC system that are...

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 黄中军王奔符永良何腾王鹏
Owner SICHUAN EXTREME ELECTRIC CONTROL SYST MFG
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