Cascaded H-bridge converter fault diagnosis method based on voltage residual
A technology for converter faults and diagnosis methods, which is applied to the measurement of electrical variables, circuit breaker testing, instruments, etc., can solve the problems of difficulty in fault detection and location, and few diagnostic algorithms, and achieve the effect of online real-time monitoring
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[0134] In order to verify the method of the present invention, the hardware structure is RT-LAB hardware-in-the-loop testing platform, and the model is a DSP controller of TMS320F28335.
[0135] Proceed as follows:
[0136] Step 1: Build a normal working model of a single-phase 3-cascade H-bridge converter on the RT-LAB platform, set the PWM switching frequency to 500Hz, the effective value of the grid side voltage to 4500V, and the DC side reference voltage to 3000V. Write the single-phase cascaded H-bridge converter control and fault monitoring program on the DSP to realize the normal operation of the single-phase cascaded H-bridge rectifier and carry out online fault monitoring.
[0137] Step 2: By controlling the loss of the control signal sent by the DSP, simulate the effect of the open circuit failure of the switch tube.
[0138] Step 3: Sampling at every other sampling interval to obtain the grid-side voltage u N , grid side current i N , DC side voltage u i real-ti...
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