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Near-optimal relaxation reactive power control method for radiation type power grid

A radiation type, power control technology, applied in reactive power compensation, AC network voltage adjustment and other directions, can solve the problems of long calculation time, large calculation accumulated error, frequent operation of discrete equipment, etc., to reduce the calculation dimension and avoid the problem of error accumulation , the effect of improving computational efficiency and optimizing accuracy

Active Publication Date: 2014-03-12
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of long calculation time, frequent actions of discrete equipment, and large calculation cumulative error in the existing reactive power optimization control method, aiming to provide a practical real-time reactive power optimization control method

Method used

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  • Near-optimal relaxation reactive power control method for radiation type power grid
  • Near-optimal relaxation reactive power control method for radiation type power grid
  • Near-optimal relaxation reactive power control method for radiation type power grid

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Embodiment Construction

[0030] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples.

[0031] figure 1 It reflects the specific flow of the radial power grid relaxation and optimization reactive power control method that reflects a control cycle. The reactive power control methods for radial grid relaxation and optimization include:

[0032] (1) Obtain the connection mode between the radial grid line and the transformer;

[0033] (2) Decouple the radial grid according to the "line-transformer" unit; and number the "line-transformer" units from 1 to n, where n is the number of "line-transformer" units; define k=1~n , and the initial value of k is 1;

[0034] (3) Collect the operating data of the kth "line-transformer" unit; the operating data includes node voltage, line parameters, transformer parameters, load parameters, and reactive power compensation equipment parameters; node voltage includes power supply...

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Abstract

The invention discloses a near-optimal relaxation reactive power control method for a radiation type power grid. The method comprises the following steps: firstly, decoupling the power grid into a plurality of ''circuit-transformer'' units; secondary, acquiring the running parameter of each unit in real time; thirdly, solving gate reactive power which corresponds to the minimum active loss of each ''circuit-transformer'' unit under a real-time load level in sequence by adopting a hill climbing method with the reactive load of each unit serving as an independent variable; lastly, determining the real-time allowed upper and lower limits of the gate reactive power according to the gate reactive power obtained in the previous step and a single-group reactive compensation capacity, and combining the upper and lower limits of bus voltage to obtain a time-varying nine-zone diagram in order to further obtain a control command of a transformer gear and reactive compensation equipment. The near-optimal relaxation reactive power control method for the radiation type power grid can be applied to real-time voltage control of the radiation type power grid; network losses are better reduced while the switching times of the equipment are reduced, so that the power grid can run safely and economically under different load levels.

Description

technical field [0001] The invention relates to a reactive power operation method of an electric power system, in particular to a reactive power control method for a radiation-type power grid including discrete equipment for relaxation and optimization. Background technique [0002] At present, in the power system, VQC is a relatively widely used voltage / reactive power control strategy, and its basic theory is the control theory of the nine-zone diagram. The control theory of the nine-zone diagram divides the voltage and reactive power into three states of too low, qualified and too high, and forms nine regions by the combination of different states of voltage and reactive power. In different regions, corresponding transformer gear adjustment and Switching of reactive power compensation equipment. VQC's regulation of reactive power at gateways is based on empirical reactive power hierarchical balance, and its strategy has not been optimized to meet the needs of energy-savin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16
CPCY02E40/34Y02E40/30
Inventor 张勇军李钦豪
Owner SOUTH CHINA UNIV OF TECH
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