An emergency control optimization method for power systems considering the temperature characteristics of transmission lines

Abstract

The invention discloses a power system emergency control optimization method power transmission line temperature characteristic. The method comprises the steps of obtaining real-time running state information of a power grid and running environment information based on a (supervisory control and data acquisition) SCADA system and a (dynamic thermal rating) DTR system, and performing extended state evaluation considering the line temperature and thermal rating of the power system to obtain the thermal rating of the power transmission line; calculating an allowed emergency control time of the power system by combining a dynamic thermal rating theory; providing a new index for judging the thermal stability of the power system, and providing a safety margin for calculating the thermal stability of the power system; and establishing a system emergency control optimization model considering the power transmission line temperature characteristic, wherein the optimized result of the model is the emergency control policy. On the premise of ensuring that the system can eliminate the line power flow out-of-limit and voltage out-of-limit within the allowed time, the control cost can be the minimum; and namely, the running safety of the system is fully ensured, the operation economy is taken into consideration as well, and the control structure is more scientific and effective.

Description

technical field [0001] The invention relates to the field of electrical engineering, in particular to an emergency control optimization method of a power system considering the temperature characteristics of a transmission line. Background technique [0002] As a pillar industry of the national economy, the power system plays a very important role in the safe and stable operation of the entire national economy. In recent years, the sharp increase in power load and the lag of power grid planning have made it difficult to build power transmission networks. To keep up with the needs of economic development, the normal operating state of the network is getting closer and closer to its transmission limit. At this time, the power grid is running in a relatively fragile state, and an accidental disturbance will cause equipment overload, which will cause the system to enter an emergency state. Improper handling will cause chain accidents, and even cause a major blackout of the entir...

AI Technical Summary

Problems solved by technology

The determination of the allowable time of traditional emergency control is to give a fixed control time based on empirical values, but under different meteorological environments and power grid operating conditions, the dynamic process of line temperature is also different, and it is difficult to adapt to the complex and changeable power grid with the same setting. The operating environment will inevitably lead to conservative or aggressive correction control decisions

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