| With the continuous development of the power industry,the continuous reform and innovation of the power system,and the more secure and reliable operation of the power grid,the real-time monitoring and analysis of the power system is very important in the large power grid dispatching.Power flow calculation system can better serve power construction and grid dispatching.This system is a real-time power flow calculation and analysis system based on the operation of power dispatching system.The main function modules include base power flow analysis,combined loop power flow analysis and optimized power flow analysis.Base power flow analysis is the most basic part.It is based on the physical model of power grid and the real-time measurement data of power grid.The power calculation model is formed by topology search algorithm.The voltage and power of each node and the current value of each branch are calculated by Newton Raphson algorithm principle,and the power flow changes under various operation modes are analyzed,and the statistic analysis are made Overload condition of standby operation.Closed loop power flow analysis is based on normal power flow analysis,which is used to calculate the transient current and steady-state current when the loop closing operation occurs in the power grid,evaluate the risk of equipment overload or protection maloperation caused by the loop closing operation,and assist the dispatcher in the decision-making of loop closing operation.Optimal power flow analysis is a module used to optimize the economic operation or safe operation of the power grid based on the normal power flow analysis.When the power grid is in summer or winter peak,the operation of some lines will be overloaded due to the high peak value of the power grid.At this time,the operation mode needs to be adjusted to transfer part of the overload line to the light load line to achieve the load average of the whole network Therefore,it is necessary to carry out optimal power flow analysis and give a guiding adjustment scheme of operation mode.The system USES C++,QT,Java and other languages,Oracle10.0 database for development.The software architecture of the system is designed in two modes: server-client mode is adopted in the power production area,the core calculation module is deployed on the server,and it runs in the system host's resident period.The data of power grid model and power grid measurement are read from the database interface provided by the power dispatching system for calculation and analysis,and the data of calculation results and statistical analysis results are written in the database,the client program is deployed on the workstation,and the calculation results read from the database are displayed on the interface.In the power management area,the server browser mode is adopted,the background program reads the calculation results from the server,and the front-end program visualizes the read data on the browser.The structure of this paper firstly reviews the development process of the power flow calculation system,analyzes the demand and related technology of the system development,then carries on the overall design and software development programming design of the system,finally displays the various functions of the power flow calculation system,introduces its practical application effect,and verifies the practicability of the system. |
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