Device and method for determining layered load reduction amount in power system risk assessment

Abstract

The present invention provides a device and method for determining the amount of hierarchical load reduction in power system risk assessment. The method includes: collecting the active power of the first type load, the second type load and the third type load of each node in the power system before the fault Demand; calculate the AC power flow based on the collected generator active output and load active demand; according to the calculation results of the AC power flow, when the branch flow exceeds the limit in the independent subsystem, obtain the 0-n degree receiving end node of the branch that exceeds the limit set; hierarchical classification to judge the size of the active power limit capacity of the power flow off-limit branch and the active power demand of each type of load at the receiving end node, and determine the load reduction range; establish a load reduction model according to the load reduction range, respectively according to the third category, Calculate the load reduction amount in the order of the second type and the first type load. The invention effectively reduces the range of load reduction in the risk analysis of the electric power system, and at the same time, can consider cutting off the loads less affected by the power failure, so that the calculation result is more in line with the actual operation requirements.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a device and method for determining hierarchical load reduction amounts in power system risk assessment. Background technique [0002] Power system risk assessment plays a vital role in power system planning decisions, and load shedding is usually regarded as one of the important indicators to quantify power system risk. Power system risk assessment usually consists of main steps such as system state selection, system state analysis, out-of-limit correction, and risk index calculation. The out-of-limit correction refers to the measures taken to eliminate the abnormal operation state of the system after component failure, such as power generation rescheduling and necessary Therefore, the method of load reduction in risk assessment directly affects the calculation results of risk indicators. [0003] Traditional power system load reduction methods can be divided into load re...

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Problems solved by technology

[0005] In view of this, the present invention proposes a device and method for determining the amount of hierarchical load reduction in power system risk assessment, aiming at the inability to balance calculation accuracy and speed in the traditional load reduction method, and the inability to remove loads in order according to the priority level of the load. The nodes participating in the load shedding calculation are limited within a certain range, and the priority order of the load shedding is taken into account. The impact of the load importance on the calculation results can be taken into account while taking into account the calculation accuracy and efficiency, making the grid risk assessment results more accurate. comprehensive

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