tailieunhanh - PSIM User Manual phần 9

5,1 thoáng qua phân tích các thông số để phân tích thoáng qua được xác định bằng cách chọn điều khiển mô phỏng trong menu Mô phỏng trong PSIM, như sau. Thời gian mô phỏng điều khiển các tham số Bước Tổng thời In Time In Bước mô phỏng thời gian bước, trong giây. | Transient Analysis Chapter 5 Analysis Specification Transient Analysis The parameters for the transient analysis are defined by selecting Simulation Control in the Simulate menu in PSIM as follows. Simulation Control Parameters Time Step Simulation time step in sec. Total Time Total simulation time in sec. Print Time Time from which simulation results are saved to the output file. No output is saved before this time. Print Step Print step. If the print step is set to 1 every data point will be saved to the output file. If it is 10 only one out of 10 data points will be saved. This helps to reduce the size of the output file. Load Flag Flag for the LOAD function. If the flag is 1 the previous simulation values will be loaded from a file with the .ssf extension as the initial conditions. Save Flag Flag for the SAVE function. If the flag is 1 values at the end of the current simulation will be saved to a file with the .ssf extension. With the SAVE and LOAD functions the circuit voltages currents and other quantities can be saved at the end of a simulation session and loaded back as the initial conditions for the next simulation session. This provides the flexibility of running a long simulation in several shorter stages with different time steps and parameters. Components values and parameters of the circuit can be changed from one simulation session to the other. The circuit topology however should remain the same. In PSIM the simulation time step is fixed throughout the simulation. In order to ensure accurate simulation results the time step must be chosen properly. The factors that limit the time step in a circuit include the switching period widths of pulses waveforms and intervals of transients. It is recommended that the time step should be at least one magnitude smaller than the smallest of the above. In Version an interpolation technique is implemented which will calculate the exact switching instants. With this technique the error due to the .

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