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Multi-terminal VSC-HVDC system droop control coefficient determining method

A VSC-HVDC, determination method technology, applied in the field of coordinated control between converter stations, can solve problems such as ignoring the stability analysis of mathematical models, achieve optimal stability and robustness, ensure stability, and increase constraints. Effect

Inactive Publication Date: 2017-05-31
SICHUAN UNIV +1
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Problems solved by technology

However, there are few studies on the mathematical model of droop control at present, and the stability analysis based on the mathematical model is also ignored when determining the droop coefficient

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Embodiment Construction

[0051] The technical solutions and technical effects of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] A method for determining the droop control coefficient of a multi-terminal VSC-HVDC system, comprising the following steps:

[0053] Step 1: Decouple the AC-DC system based on the average value model of VSC, the DC side of the converter is equivalent to a DC current source, and the DC line is π-type equivalent to obtain the equivalent model of the VSC-HVDC system.

[0054] Step 2: Establish its state space model based on the equivalent model of the multi-terminal VSC-HVDC system. Specifically:

[0055] Let the state space model of the multi-terminal VSC-HVDC system be

[0056]

[0057] In the formula: x is the state variable; ω is the disturbance variable; u is the control variable; y and z are the output variables; A, B ω , B u , C y , C z is the state matrix.

[0058]...

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Abstract

The invention discloses a multi-terminal VSC-HVDC (Voltage Source Converter Based High Voltage Direct Current) system droop control coefficient determining method comprising the following steps: first, a DC system state space model containing droop control is built based on a mean value model of VSC, and the action mechanism of droop control is analyzed using the model; and then, a droop coefficient determining problem is converted into an optimization problem with minimum system hybrid sensitivity Frobenius-Hankel norm as the objective based on the system model, and the eigenvalue constraint and steady-state error constraint of a closed-loop system are considered to optimize the stability and robustness of the system. The method can maximize the stability of the system under disturbance and make the system have certain fault ride-through capability. Moreover, the method can be combined with other droop coefficient determining methods, and a droop controller meeting different requirements or achieving different functions can be designed by increasing constraint conditions or changing the optimization objective.

Description

technical field [0001] The invention relates to the technical field of coordinated control among converter stations in power grid construction, in particular to a method for determining droop control coefficients of a multi-terminal VSC-HVDC system. Background technique [0002] Multi-terminal voltage source converter based high voltage direct current (VSC-HVDC) is gradually becoming a new trend in power grid construction. In order to make better use of the adjustment capability of the multi-terminal VSC-HVDC system, it is necessary to study the coordinated control mode between converter stations. Among them, the comprehensive performance of voltage droop control is better, and it is currently the most widely used coordinated control mode between stations. The voltage droop control coefficient determines the proportion of power and voltage regulation tasks undertaken by the converter station, and then determines the stability of the system, so the determination of the droop ...

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60H02J3/36
Inventor 刘天琪彭乔李保宏吴亚楠曾琦王顺亮李兴源
Owner SICHUAN UNIV
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