Closed loop operation risk analysis method for power system

Abstract

The invention relates to a method for analyzing the risk of closed loop operation in a power system, comprising the following steps: (1) acquiring an online power grid model and a data section; (2) setting a closed loop operation point; (3) automatically carrying out topology search of closed loop path in the whole network; (4) calculating the impedance of a closed loop interface; (5) calculating closed loop electric current on line; (6) analyzing and calculating power grid state after a loop is closed; (7) prompting the risk of the closed loop operation: a prompting message indicating whether the closed loop is reasonable or not is provided to the power system for dispatching and to the operating staff for reference based on the result calculated by the closed loop electric current, the closed loop flow and the power grid flow after the loop is closed and the topology search result of the closed loop path. Based on the invention, the closed-loop risk can be accurately analyzed so as to prompt the operating staff to avoid the false operations and ensure the operation safety.

Description

technical field [0001] The present invention relates to a safety analysis method of a power system, more precisely, the present invention relates to a risk analysis method of a power system loop closing operation. It belongs to the field of electric power technology. Background technique [0002] With the development of the national economy, users' requirements for power supply reliability continue to increase, and the operation and management of power distribution networks also have new goals, requiring more reliability, rationality and efficiency. After large-scale urban power grid transformation, most of the 10kV distribution network has reached the power supply mode of "closed-loop connection and open-loop operation" through transformation. Each of the loads is powered by a single busbar, and the load areas carried by different busbars are isolated by contact switches to form a power supply load. Under normal circumstances, in order to ensure the radial operation struc...

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Problems solved by technology

[0004] However, there is currently no complete risk analysis method for loop closure in China, and existing similar tools in China face three problems: 1. Offline analysis system

The real-time data of the power grid cannot be obtained online from the energy management system, and the operator or dispatcher of the power system must manually establish an equivalent model according to the operation of the power grid, which is very cumbersome and cannot be guaranteed to be accurate, and is not universal; 2. Loop impedance The use of rough cumulative calculations leads to inevitable errors in the results of loop closure information calculated on this basis, which is not practical; 3. Lack of loop path inspection, loop phase verification, loop closure current verification, and post-loop closure Complete risk warning mechanism for online power flow analysis

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