Allocation Method of Spare Shared Capacity in Interconnected Grid Considering Security Constraints

Abstract

The invention discloses an interconnected network standby shared capacity allocation method considering security constraints, and belongs to the control field of electrical power systems. The interconnected network standby shared capacity allocation method comprises the following steps: using a provincial network adjustable capacity analysis method based on sensitivity analysis and cross-section margin so as to determine actually available support capacity of each member in a standby sharing group; on the basis of unit regulation performance and power transmission line available capacity, presenting an active support optimal allocation strategy considering provincial cross-section and inter-provincial interconnection line security constraints, and giving full play to the roles of an interconnected network in high-power loss disruption recovery under the precondition of guaranteeing transmission cross-section and interconnection line power transmission security through method improvement of fixed coefficient allocation loss power in control deviation of a dynamic area.

Description

technical field [0001] The invention relates to a method for allocating backup shared capacity of an interconnected power grid considering safety constraints, and belongs to the technical field of electric power systems. Background technique [0002] With the continuous increase of power received outside the power grid in some areas, the characteristics of the large receiving end power grid are becoming more and more obvious. Any DC commutation failure or unipolar or bipolar blocking failure will inevitably lead to a sharp drop in grid frequency. When a large disturbance occurs in the frequency of the interconnected grid, the recovery of the system frequency first depends on the primary and secondary adjustments of the system frequency. The inter-connection line plan is not corrected in real time according to the power loss of each control area, which will inevitably lead to a large reduction in output in the non-DC drop point control area and cause miscontrol, which is not ...

AI Technical Summary

Problems solved by technology

[0009] The dynamic economic dispatch model proposed in Document 3 integrates the factors of electricity market and ancillary service market, and considers the demand for spare capacity for safe operation of the system under normal working conditions and N-1 working conditions. Similar to Document 2, this model solves the existing The problem of power purchase cost optimization above the demand for spare capacity, without analyzing the adjustable capacity under the current operating conditions of the power grid, cannot provide effective technical support for inter-provincial reserve capacity mutual aid under accident disturbances

Images