Transient simulation method of distributed power generation system based on automatic differentiation technology

Abstract

The invention discloses a transient simulation method of a distributed power generation system based on an automatic differentiation technology, which comprises the following steps: reading the basic information, topological connection, mathematical model expression and related parameters of a distributed power; stating a corresponding combinational function and independent variable, allocating memory for automatic differentiation and setting stimulation time to be zero; propelling a stimulation step forwardly for the stimulation time; calculating the differential coefficient information and function values of the corresponding combinational function through automatic differentiation; forming a Newton iterative format through combining the whole system equations, updating elements at corresponding positions of column vectors of a Jacobian matrix when iterative solving and the function values through the result obtained from automatic differentiation calculation; solving linear equations to obtain the column vector of variable increment of step k; updating the variable value; judging whether the stimulation time reaches the ceasing moment of stimulation, if yes, releasing the memory to finish stimulation; and otherwise, returning to step three. The method improves the calculation efficiency of programming and simultaneously keeps the maintainability and scalability of codes.

Description

technical field [0001] The invention relates to a method for modeling and simulating a distributed generation system in an electric power system. In particular, it relates to a transient simulation method for distributed power generation systems based on automatic differential technology. Background technique [0002] In the development process of distributed generation system simulation software, an important problem that needs to be faced is the model description of the distributed power generation control system, or the realization of the control system model in the simulation algorithm. Distributed power supply has the characteristics of many types and various control strategies. Each distributed power supply and its control system are described as a whole according to a certain model and built into the simulation algorithm. The advantage of this is that the efficiency of the simulation will be improved. However, the disadvantage is that in the face of new distributed p...

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Problems solved by technology

When using manual programming to calculate the analytical expression of the derivative, the calculation process is more complicated, and sometimes the analytical expression of some differential terms cannot be obtained; symbolic differentiation is suitable for the calculation and solution of small-scale problems, and it is difficult to calculate the high-order derivative of the function, which is not conducive to The expansion of the program; the implementation of the numerical difference method is relatively convenient, and the improved sparse difference method has a relatively fast solution speed, thus becoming one of the most widely used methods, but the disadvantage of the numerical difference method is that there are truncation errors and rounding errors , and it is also difficult to determine the appropriate difference interval

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