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Adaptive droop control method applicable to flexible DC distribution system

A flexible DC power distribution and control method technology, applied in the direction of power transmission AC network, etc., can solve the problems of unsatisfactory voltage dynamic adjustment, unreasonable power distribution, poor system stability, etc., achieve automatic optimization of droop coefficient, and realize no static error The effect of regulating and suppressing the change of DC voltage

Pending Publication Date: 2019-08-02
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0005] The invention aims at the problems of poor system stability, unsatisfactory voltage dynamic adjustment and unreasonable power distribution in the traditional droop control adopted by the converter station of the flexible direct current power distribution system, and proposes an adaptive droop suitable for the flexible direct current power distribution system The control method combines adaptive control, predictive control and traditional droop control methods, and proposes a new droop control strategy suitable for flexible DC power distribution systems with additional DC voltage deviation compensation and adaptive adjustment of each droop coefficient according to the maximum dynamic power margin

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  • Adaptive droop control method applicable to flexible DC distribution system
  • Adaptive droop control method applicable to flexible DC distribution system
  • Adaptive droop control method applicable to flexible DC distribution system

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Embodiment Construction

[0041] Aiming at the power fluctuation or operation mode change of the flexible DC power distribution system, the present invention uses the control method of adaptive droop adjustment, on the one hand, adopts DC voltage deviation compensation, and updates the voltage reference value of the converter station in real time; on the other hand, according to the voltage deviation sign Calculate the maximum power margin of each station based on the actual output conditions, adaptively adjust the droop coefficient of each converter station, reduce the probability of converter station parameters exceeding the limit, and realize the optimal configuration of unbalanced power and the adjustment of DC voltage without static difference , improving system stability and power quality. Finally, by introducing the model current predictive control, the complex PI parameter setting of the current inner loop control is avoided, and the dynamic response speed of the system is further improved.

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Abstract

The invention relates to an adaptive droop control method applicable to a flexible DC distribution system, which combines adaptive control, predictive control and the traditional droop control mode and proposes a novel droop control strategy applicable to additional DC voltage deviation compensation of the flexible DC distribution system and adaptive adjustment of each droop coefficient accordingto the maximum dynamic power margin. The model predictive current control is introduced to further improve the response speed of the system control. The adaptive droop control not only realizes floating control of the DC voltage, but also can automatically optimize the droop coefficients, thereby enabling the droop curve of each converter station to adaptively shift according to the dynamic powermargin principle, reasonably distributing the unbalanced power, and being well applicable to the flexible DC distribution system.

Description

technical field [0001] The invention relates to a power control technology, in particular to an adaptive droop control method suitable for a flexible DC power distribution system. Background technique [0002] The flexible DC power distribution system has the advantages of large transmission capacity and flexible control. It improves energy conversion efficiency while reducing the number of commutation links. The ideal way to demand. As the key technology of the new generation of integrated energy distribution system, in recent years, a large number of institutions and related scholars at home and abroad have carried out theoretical research and application on its system architecture, application scenarios, voltage levels, key equipment, control strategies, and protection systems. demonstration. Among them, a reasonable control strategy is the key link to improve the power quality and ensure the reliability of the system. [0003] Voltage droop control has strong anti-int...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 李盈含高亮殷煌凯陈蒙蒙
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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