Novel multi-terminal flexible DC power distribution system coordination control method

A multi-terminal flexible, DC power distribution technology, applied in the direction of AC network circuits, circuit devices, electrical components, etc., can solve the problems of increasing the amount of control calculation, unfavorable system safe and stable operation, and DC side voltage fluctuations, so as to improve stability and Effects of robustness, improved dynamic response and power fluctuation

Pending Publication Date: 2021-12-17
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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Problems solved by technology

However, the voltage outer loop has nonlinear characteristics. Disturbances such as port power mutations and AC voltage fluctuations will cause voltage fluctuations on the DC side and affect the normal operation of the system.
In order to control the voltage stability, PI control has been used in existing research, but there are many PI controllers in the multi-terminal flexible straight system, the parameter setting is difficult, the control accuracy is not high, and the anti-interference ability is poor
There are also studies based on model prediction to design the inner loop current co

Method used

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  • Novel multi-terminal flexible DC power distribution system coordination control method
  • Novel multi-terminal flexible DC power distribution system coordination control method
  • Novel multi-terminal flexible DC power distribution system coordination control method

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Example Embodiment

[0056] Embodiments, a novel multi-terminal flexible DC power distribution system coordination control method, including the following steps:

[0057] Step 1: First establish the mathematical model of the multi-terminal flexible DC power distribution system, and analyze the nonlinear characteristics of DC voltage control on this basis.

[0058] Step 2: According to the nonlinear characteristics of DC voltage control analyzed in step 1, the advantages and disadvantages of the traditional double closed-loop PI control are analyzed, and a new URC controller is proposed on this basis. According to the parameter matrix A in the controller K According to different values, different working modes are set to realize the multi-mode smooth switching of the multi-terminal flexible DC power distribution system.

[0059] Step 3: According to a new type of voltage controller designed in step 2, build a four-terminal flexible DC power distribution system model in Matlab / Siumlink, and verify t...

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Abstract

The invention belongs to the field of power electronic converter control, and particularly relates to a novel multi-terminal flexible DC power distribution system coordination control method. On the basis of analyzing the advantages and disadvantages of traditional double-closed-loop PI control, a novel URC controller is provided, different working modes are set in the controller according to different parameter matrix values, multi-mode smooth switching of a multi-terminal flexible DC power distribution system is realized, the dynamic responsiveness and power fluctuation of a multi-terminal high-voltage DC power grid can be improved, and the stability and robustness of the system are improved.

Description

technical field [0001] The invention belongs to the field of power electronic converter control, and in particular relates to a novel multi-terminal flexible direct current power distribution system coordination control method. Background technique [0002] With the rapid development of social economy, high-reliability power supply and high-proportion clean energy-friendly access put forward higher requirements for power transmission technology of distribution network. The traditional contact switch of the distribution network only has two states of on and off, and problems such as short-circuit current increase, electromagnetic ring network, and circulating power are prone to occur during operation. Therefore, the concept of a multi-port flexible DC power distribution system is proposed. The multi-terminal flexible DC power distribution system is a new type of system based on power electronics technology. It decouples and interconnects the AC system in the form of "AC-DC-AC...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36H02J2003/365H02J2203/20Y02E60/60
Inventor 孙健周建华葛乐嵇建飞肖小龙戴强晟司鑫尧苏伟吴楠陈雯嘉张迎星张宸宇葛雪峰刘瑞煌姜云龙
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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