Ong term voltage stability prevention and control method based on time sequence optimal power flow method

A technology for optimal power flow and voltage stability, applied in AC network circuits, forecasting, electrical components, etc., and can solve problems such as unbalanced reactive power distribution and system collapse.

Inactive Publication Date: 2015-12-23
SHANDONG UNIV
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Problems solved by technology

In the case of heavy loads, if all node voltages are forced to be within a certain fixed range, it may lead to long-distance transmission of react...

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  • Ong term voltage stability prevention and control method based on time sequence optimal power flow method
  • Ong term voltage stability prevention and control method based on time sequence optimal power flow method
  • Ong term voltage stability prevention and control method based on time sequence optimal power flow method

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Embodiment Construction

[0050] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0051] Aiming at the shortcomings that the current voltage prevention and control methods fail to comprehensively consider the load change trend within a period of time and the reactive power distribution balance, the present invention provides an effective long-term voltage prevention and control method, so as to prevent long-term voltage failure stable accidents.

[0052] Such as figure 1 As shown, the present invention formulates a two-layer time frame based on the optimal power flow method to construct the time-series optimal power flow method. The upper frame is the ultra-short-term load forecasting and voltage situation control part, which is used to screen the expected accident set for the system, The selection of voltage situation control nodes and the setting of the voltage constraint range provide constraint decision-making for the lower layer; the...

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Abstract

The invention discloses a long term voltage stability prevention and control method based on a time sequence optimal power flow method; the long term voltage stability prevention and control method comprises the following steps: using a load prediction start point as a prevention point, carrying out line fault screening pretreatment, building a grey load prediction model, and obtaining a predicted load curve in the time period; carrying out preconception accident set screening according to the predicted load curve; employing a system power flow equation minimum modulus characteristic value, in a maximum load Lmax portion of the predicted load curve, to carry out node classification for load node injection variable sensitivity, determining a node voltage to constrain an upper boundary and a lower boundary, and using transmission loss as a target function to do optimal power flow calculation; carrying out super-short term load forecast in the time period of h1-h2 at a new prevention point h1 when the lower time reaches the new prevention point h1. The beneficial effects are that the method provides a voltage state and tendency following control concept, so key load nodes can be monitored, thus making more effective idle balance and voltage safety control measures under heavy load conditions.

Description

technical field [0001] The invention relates to the field of power system operation and control, in particular to a long-term voltage stability preventive control method based on the sequential optimal power flow method. Background technique [0002] The frequent occurrence of power system voltage instability accidents in recent years has brought new challenges to the safe and stable operation of the power system. These accidents are characterized by a relatively long continuous voltage drop process during the development of the accident. In order to prevent the occurrence of long-term voltage instability accidents, it is necessary to formulate reasonable and effective long-term voltage prevention and control strategies. The formulation of the long-term voltage instability prevention and control strategy needs to ensure the accuracy of the calculation and be able to adapt to the requirements of on-line applications. Currently, there is no effective prevention and control str...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06Q10/04G06Q50/06
CPCY02E40/70Y04S10/50
Inventor 张文王超
Owner SHANDONG UNIV
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