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Variable target control method of flexible direct current power transmission system

A technology of power transmission system and flexible DC, which is applied in the direction of AC network circuit, system integration technology, information technology support system, etc. It can solve the problems of complex control, difficulty in taking into account rapidity and overshoot, and weak control system robustness. , to achieve the effect of enhancing robustness

Inactive Publication Date: 2018-06-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and provide a flexible direct current transmission system to solve the problems of complex control, difficulty in both rapidity and overshooting, and poor robustness of the control system in the control of the flexible direct current transmission system System variable target control method

Method used

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  • Variable target control method of flexible direct current power transmission system
  • Variable target control method of flexible direct current power transmission system
  • Variable target control method of flexible direct current power transmission system

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Embodiment

[0031] figure 1 It is the structure of the outer loop control of the control strategy of the flexible HVDC converter station. The active power outer loop control includes constant active power control and constant DC voltage control, and the reactive power type control is constant reactive power control. Such as figure 1 As shown, the calculation of the active class outer loop control is i d The reference value of the reactive power class outer loop control is calculated as i q The reference value of the reference value, and the outer loop control of the active class and the reactive class. The control of each converter station needs to choose one to realize the control.

[0032] figure 2 It is the control block diagram of the inner loop current control. When the inner loop current control adopts PI control so that i d i q When tracking the reference value, the relational expression for the input quantity of the inner loop controller can be obtained:

[0033] v d = u d...

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Abstract

The invention discloses a variable target control method of a flexible direct current power transmission system. According to the method, a new variable target control link is added after a link of calculation of an error between a target value and an actual value through converter outer loop control. The input control reference quantity under dual-loop control of the converter of the flexible direct current power transmission system is subjected to tracking regulation; and the input control reference quantity under dual-loop control of the converter is divided into multiple gradually progressive small target values according to the regulation limit of the system to enable the system to reach the divided small target values within the given time in an non-overshoot and quick manner, so that the target value of the input control reference quantity is reached gradually, and non-overshoot and quick tracking of the control reference quantity can be realized. In addition, after variable target control is added, the system dual-loop controlled PI link parameters can be set more easily, so that different working condition requirements of the system can be satisfied.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission in power systems, in particular to a variable target control method for a flexible direct current transmission system. Background technique [0002] The application of flexible DC transmission determines that it needs good control performance. It is necessary to ensure the stability and rapidity of its control system, and ensure the flexibility of power flow deployment and anti-interference ability under the premise of ensuring the voltage and power stability of the DC transmission system. The control method of flexible direct current transmission system is generally for d q Shaft current and voltage are controlled, and the control can be divided into inner loop current control and outer loop control. The inner loop current control adjusts the converter output voltage v d , v q come on i d i q Perform tracking control. The outer loop control is based on the contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J13/00H02J3/18H02J3/24
CPCH02J3/18H02J3/24H02J3/36H02J13/0017H02J2003/365Y02E40/30Y02E40/70Y02E60/60Y04S10/22
Inventor 夏成军刘志江王真华夏
Owner SOUTH CHINA UNIV OF TECH
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