Initial report of power flow calculation
Power flow calculation is to determine the steady-state operation parameters of each part of the power system according to the parameters and operating conditions of the given power grid structure, generators, loads and other components.
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MatlAB power flow calculation modeling and simulation opening report
Significance and purpose of topic selection
Power flow calculation is the simplest but very important analysis and calculation in power system, which can be used to study various problems raised in system planning and operation. For the planned power system, power flow calculation can verify whether the proposed power system planning scheme can meet the requirements of various operation modes; For the power system in operation,
Through power flow calculation, it can be predicted whether various load changes and network structure changes will endanger the safety of the system, whether the voltages of all buses in the system are within the allowable range, and whether various components (lines, transformers, etc.). ) will overload in the system, and what preventive measures should be taken in advance when overload may occur.
However, the traditional power flow calculation program lacks a graphical user interface, the results are not intuitive, it is difficult to integrate with other analysis functions, and the network raw data input is large and prone to errors. With the rapid development of computer technology, combined with the characteristics of power system and the development and design idea and overall structure of graphical power flow calculation software,
The application of MATLAB software can improve this problem. The main features of the system are simple operation, intuitive graphical interface, stable operation and accurate calculation. In the calculation, the algorithm is improved to improve the calculation speed, and various types of effective encapsulation make the program have good modularity, maintainability and reusability.
Research status of the subject (including literature review)
Power flow calculation of power system is the basic operation to study the stable operation of power system, which can determine the voltage distribution and power distribution of the system, as well as the power distribution and loss in the network. For the planned power system, power flow calculation can verify whether the proposed power system planning scheme can meet the requirements of various operation modes; For the power system in operation,
Through power flow calculation, it can be predicted whether various load changes and network structure changes will endanger the safety of the system, whether the voltages of all buses in the system are within the allowable range, and whether various components (lines, transformers, etc.). ) will overload in the system, and what preventive measures should be taken in advance when overload may occur.
Power flow calculation is not only the basis of quantitative analysis of rationality, reliability and economy of power system planning, design and operation mode, but also the basis of static and transient stability calculation of power system. Computer power flow calculation began in the mid-1950s and experienced Gauss-Saidel iterative method based on node admittance.
Newton-Raphson method, a typical method for solving nonlinear equations, and its improved fast decoupling PQ decomposition method.