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Multi-unit Coordinated Control Method of Distributed Power Flow Controller

A power flow controller and coordinated control technology, applied in electrical components, AC network circuits, circuit devices, etc., can solve problems such as low work efficiency, switch tube wear, shortened life of series systems, etc., to extend life, reduce failure rates, The effect of improving the average utilization rate

Active Publication Date: 2022-05-17
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] At present, the control method for multiple DPFCs in the system is mainly based on the average distribution method. When working, the DPFC units of the entire series system output on average according to the control target, but when the total output demand of DPFCs is small, each DPFC The unit output is far below the rated value, and the work efficiency is extremely low; and because all DPFC units are always in working condition, the switch tube of each DPFC unit is also constantly worn out, which will greatly shorten the life of the entire series system composed of DPFC

Method used

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  • Multi-unit Coordinated Control Method of Distributed Power Flow Controller
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  • Multi-unit Coordinated Control Method of Distributed Power Flow Controller

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Embodiment Construction

[0050]The technology of the present invention will be described in detail below in combination with specific embodiments. It should be known that the following specific embodiments are only used to help those skilled in the art understand the present invention, rather than limiting the present invention.

[0051] DPFC structure such as figure 1 As shown, the single-turn coupling transformer is ignored here, L se Is the filter inductance (taking into account the transformer leakage inductance), C se is the filter capacitor, V se,i is the injection voltage of a single DPFC unit.

[0052] Since DPFC is a voltage source converter, when the DC side voltage is constant, if the modulation ratio is very small, the injection voltage V of a single DPFC unit se,i The harmonic components will be similar to the fundamental components, the waveform distortion is serious, and the work efficiency is not high. Therefore, in order to improve the working efficiency of each DPFC unit, it is ...

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Abstract

The invention discloses a multi-unit coordinated control method of a distributed power flow controller. The technical solution adopted in the present invention is: the output distribution of all DPFC units is undertaken by the coordination controller, which updates the control target every other control cycle T, and then judges whether the control target changes, and when the control target remains unchanged, The number and output of DPFC units also remain unchanged; when the control target changes, the coordinating controller needs to re-establish the DPFC unit allocation plan according to the new control target, and find out the number of DPFC units that need to be put into work and each DPFC unit. The output power of the unit. The invention can ensure that each working DPFC unit is in an efficient operation state, and fully utilizes the redundant units on the line, improves the average utilization rate of all DPFC units, reduces the failure rate of a single DPFC unit, and greatly prolongs the entire DPFC series system lifespan.

Description

technical field [0001] The invention belongs to the technical field of smart grid operation and stability control. Specifically, it relates to a multi-unit coordinated control method of a distributed power flow controller based on an alternate working mode. Background technique [0002] Distributed power flow controller (DPFC) is one of the development directions of FACTS technology in the future. It can make the traditional FACTS device used on the transmission line miniaturized, low-cost, and mobile, making it more comprehensive in function, simpler in structure, and easier to maintain. and easier to apply. DPFC can be applied to the transmission network and installed in substations in a distributed manner. It has the functions of system operation optimization, balanced optimization of power flow distribution, limiting the overload of the power flow section, suppressing power oscillation and sub-synchronous resonance, and reducing the transmission loss of my country's tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/10
Inventor 裘鹏金玉琪郭锋项中明陆承宇徐华王松陆翌张静潘武略陈骞谢浩铠陈明李心宇周路遥唐爱红卢智键罗绍铷
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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