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Control method of distributed in-series coupling power flow controller

A power flow controller and series coupling technology, applied in the control field of flexible AC transmission system application technology, can solve problems such as large area, complex structure, and various functions, achieve optimal power flow distribution, increase transmission capacity, and protect lines Effect

Active Publication Date: 2015-01-28
STATE GRID CORP OF CHINA +1
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Problems solved by technology

However, this type of centralized, large-capacity FACTS device: has many functions, complex structure, large floor area, high one-time investment cost, and high professional technical requirements for daily operation management, maintenance and repair personnel

Method used

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  • Control method of distributed in-series coupling power flow controller
  • Control method of distributed in-series coupling power flow controller
  • Control method of distributed in-series coupling power flow controller

Examples

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Embodiment

[0049] Taking Liaoning Power Grid as an example, in its 500kV / 200kV electromagnetic ring network, due to the unbalanced distribution of compliance and the imbalance of line transmission capacity, there are 1) insufficient transmission capacity of related lines caused by excessive growth of compliance, 2) high and low voltage The equivalent impedance of the grade line is quite different, the transmission bottleneck caused by the large power flow transfer caused by the open loop of the electromagnetic ring network, and 3) the unbalanced distribution of the Thevenin equivalent impedance of the power grid leads to the unbalanced distribution of the power flow.

[0050] In the sending section of Qinghe Power Plant in Liaoning Province, there are many lines, and some lines are under heavy load while other lines are still under light load state. In the maintenance mode, if there is no fault N-1 disconnection, it will lead to overload. The application of DSR (that is, the self-control ...

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Abstract

The invention relates to a control method of a distributed in-series coupling power flow controller. The distributed in-series coupling power flow controller comprises a distributed in-series coupling electric reactor group. A single distributed in-series coupling electric reactor comprises a coupling transformer, a silicon controlled rectifier group V1, an electric contactor S1, a current transformer, a zinc oxide arrester MOV and a wireless communication component. The control method comprises three layers of control strategies, namely a transient state locking strategy, a far end power flow overall control strategy and a power flow self controlling strategy. Through a wireless communication mode, the distributed in-series coupling electric reactor group can carry out corresponding switching by receiving dispatching center macroscopic readjustment and control, so that the purpose of optimal power flow distribution is achieved, a line is prevented from exceeding the thermal stability limit, and the transmission capacity of a network section can be increased. Under the situation of a communication barrier, by self detecting, the over-high current of the line is limited, and the purpose of line protecting is achieved. The method is used in a power grid of at least 220 kV of a certain province through simulation, and effect is obvious.

Description

technical field [0001] The invention relates to a control method for the application technology of a flexible alternating current transmission system, in particular to a control method for a distributed series coupled power flow controller. Background technique [0002] Today's power system power distribution and grid structure change extremely rapidly, transmission and distribution network transmission line congestion occurs from time to time, and system stability is also affected, resulting in soaring operating costs, low full utilization of system equipment, and uneven distribution of power flows. economy. The flexible AC transmission system FACTS technology widely used in the power grid at present, such as controllable series compensation, SVC, controllable high reactance, etc. These devices play an extremely important role in the safe and stable operation of the power grid in UHV and EHV systems. However, this kind of centralized, large-capacity FACTS device has many ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/001H02J3/0073
Inventor 盖振宇赵刚魏春霞
Owner STATE GRID CORP OF CHINA
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