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Adaptive Droop Control Method for Multi-terminal Flexible HVDC Transmission Considering Line Resistance

A multi-terminal flexible, DC transmission technology, applied in the direction of power transmission AC network, circuit devices, electrical components, etc., can solve problems such as overloading of converter stations, affecting active power of converter stations, and fixed droop coefficient, so as to avoid overloading and realize Accurate and coordinated control to ensure the effect of stable operation

Active Publication Date: 2022-07-26
国网新疆电力有限公司营销服务中心 +1
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Problems solved by technology

[0004] The present invention is to solve the problem that the droop coefficient is fixed in the traditional droop control method, so when the power fluctuation is large, it is easy to cause the converter station to be overloaded; and the resistance on the DC line will cause a voltage drop on the line, which will affect the commutation. To solve the problem of accurately distributing active power in substations, an adaptive droop control method for multi-terminal flexible HVDC transmission considering line resistance is now provided

Method used

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  • Adaptive Droop Control Method for Multi-terminal Flexible HVDC Transmission Considering Line Resistance
  • Adaptive Droop Control Method for Multi-terminal Flexible HVDC Transmission Considering Line Resistance
  • Adaptive Droop Control Method for Multi-terminal Flexible HVDC Transmission Considering Line Resistance

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specific Embodiment approach 1

[0027] Specific implementation mode 1: refer to Figures 1 to 5 This embodiment is described in detail. The adaptive droop control method for multi-terminal flexible DC transmission considering line resistance described in this embodiment, the reactive power control loop adopts figure 2 The traditional constant AC voltage control or constant reactive power control in the traditional figure 2 The active outer ring in is replaced by figure 1 In the middle droop control mode, the droop control expression is as follows:

[0028]

[0029] in, is the PI control transfer function expression, k p is the scale factor, k i is the integral coefficient, Indicates the integral, U dc and U dcref are the actual value and reference value of the DC voltage of the converter station, respectively, P jref and P j are the power reference value and the actual power of the jth converter station, respectively.

[0030] when When the power of the multi-terminal flexible DC transmiss...

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Abstract

A multi-terminal flexible direct current transmission adaptive droop control method considering line resistance relates to the technical field of power control. The invention is to solve the problem that the droop coefficient is fixed in the traditional droop control method, so when the power fluctuation is large, it is easy to cause the converter station to be overloaded; and the resistance on the DC line will cause a voltage drop on the line, which will affect the commutation. The problem of accurate allocation of active power to the station. The adaptive droop control method for multi-terminal flexible direct current transmission considering line resistance according to the present invention enables the converter station to make full use of its own capacity and avoid overload of the converter station. Moreover, considering the influence of line resistance, the dynamic power of the system can be distributed accurately and reasonably. The invention realizes accurate coordinated control of power and ensures stable operation of the system.

Description

technical field [0001] The invention belongs to the technical field of power control, in particular to the power transmission control technology of a converter station. Background technique [0002] The multi-terminal flexible DC transmission system based on voltage source converters has good application scenarios in the fields of island power supply and offshore wind power grid connection due to its flexibility in dispatching and low transmission cost. There are three main control methods of multi-terminal flexible DC transmission: constant DC voltage control mode, constant active power control mode and droop control mode. Among them, the droop control method is widely used in multi-terminal flexible DC transmission because of its high reliability and no need for communication. [0003] In the traditional droop control method, since the droop coefficient is fixed, when the power fluctuation is large, it is easy to cause the converter station to be overloaded. In addition,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/38
CPCH02J3/36H02J3/381H02J2203/20Y02E60/60
Inventor 王少林王刚张超王晓磊曹云峰李志潭刘立果杨金成张海丽刘陶陈琦刘鸿鹏
Owner 国网新疆电力有限公司营销服务中心
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