Method, device and system for inhibiting ring current between large power PWM (Pulse-Width Modulation) rectification power supply modules
A technology of rectifying power supply and circulating current suppression, applied in the field of power system, can solve the problems affecting the security of distribution network, inconsistent switching time of multiple rectifying power supply modules, etc., to achieve the effect of balancing load, improving safety and stability, and suppressing circulating current.
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Embodiment 1
[0032] Such as figure 1 As shown, the embodiment of the present invention provides a method for suppressing circulating current between high-power PWM rectifier power supply modules. The high-power PWM rectifier power supply includes a first rectifier power supply module and a second rectifier module. The method includes:
[0033] S10. Collect the three-phase input current of the first rectifying power module to obtain the circulating current between the first rectifying power module and the second power rectifying module;
[0034] S20. Obtain the phase difference of the triangular carrier signal of the first rectifying power module and the second rectifying power module according to the circulating current;
[0035] S30. Calculate the carrier compensation delay time according to the carrier phase difference;
[0036] S40. Adjust the phase of the triangular carrier signal of the first rectifying current module according to the carrier compensation delay time, so as to synchro...
Embodiment 2
[0056] Such as figure 2 and image 3 As shown, the high-power PWM rectified power supply provided by the embodiment of the present invention includes: a rectified power supply main circuit 100 composed of a first rectified power supply module 101 and a second rectified power supply module 102 connected in parallel, a circulating current suppression device 200 and a voltage and current control module 300 .
[0057] Among them, the circulation suppression device 200 provided by the embodiment of the present invention, such as figure 2 and image 3 shown, including:
[0058] The circulating current acquisition module 202 is configured to collect the three-phase input current of the first rectified power supply module, so as to obtain the circulating current between the first rectified power supply module and the second power supply rectification module; The three-phase input current i of the second rectified power module 2a i 2b i 2c The zero-sequence current of the secon...
Embodiment 3
[0066] An embodiment of the present invention also provides a circulation suppression system between high-power PWM rectification power supply modules, including the circulation suppression device described above. Based on the same purpose of the invention, the same technical problem is solved, and the same technical effect is achieved, the embodiments of the present invention will not be repeated one by one.
[0067] To sum up, the embodiment of the present invention provides a method, device and system for suppressing circulating current between high-power PWM rectifying power modules. The circulating current is obtained by collecting the input current of the rectifying power module, and the carrier wave of the two rectifying power modules is obtained according to the circulating current. The phase difference between the two rectifier power modules can be obtained to obtain the carrier compensation delay time. According to the carrier delay time, the phase of the carrier wave...
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