PWM signal sampling and equivalent pulse width reconstruction method for power electronic real-time simulation

Abstract

The invention discloses a PWM signal sampling and equivalent pulse width reconstruction method for power electronic real-time simulation, and the method comprises the steps: 1, carrying out the high-speed sampling and equivalent pulse width calculation of a PWM signal generated by an external hardware-in-loop controller through an FPGA, and determining a switching action equivalent moment throughthe equivalent pulse width reconstruction, if a plurality of switching actions exist in a certain simulation step length period, unifying the switching actions as a switching action equivalent moment;and 2, according to a network equation of a to-be-simulated model, solving a related state variable of a switching action equivalent moment, and introducing two model calculation modes at a specificposition in a simulation step length period according to the switching action equivalent moment. According to the method, the measurement error of the pulse width in each simulation step length periodcan be reduced, and the calculation amount in the switching action processing process can be reduced, so that the calculation precision and the simulation efficiency of real-time simulation of the power electronics in the limited step length can be improved.

Description

technical field [0001] The invention relates to a PWM signal sampling and equivalent pulse width reconstruction method for real-time simulation of power electronics, belonging to the field of real-time simulation of power electronics. Background technique [0002] Power electronics technology has been widely used in various fields of national economy such as industry, transportation and national defense of our country. As an important means of researching power electronics technology, real-time simulation can help researchers verify the effectiveness of control algorithms and protection strategies and facilitate hardware design and debugging. Real-time simulation samples the PWM signal at a set simulation step cycle. When the frequency of the PWM signal is high, the measurement error of the pulse width within a simulation step increases with the increase of the simulation step, which may seriously affect the simulation accuracy. ; In addition, there may be multiple switchin...

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Problems solved by technology

However, in the face of multiple switching actions within a simulation step, this method needs multiple interpolation operations to determine each switching action moment. Since each interpolation operation takes a certain amount of time, too small a simulation step size cannot meet the requirements. requirements, which will make real-time simulation difficult to achieve

[0006] 3) Use the FPGA board with a high-frequency working clock to accurately sample the moment when the PWM signal pulse jumps, and introduce these time stamp information signals into the real-time simulation platform to complete the switching action processing process, but when a simulation step When there are multiple time stamp information within a long period, the simulation system needs to perform multiple calculations within one simulation step size, and the calculation amount is large and the simulation step size is too small to meet the requirements

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