Control circuit of three-phase Vienna rectifier and its mixed carrier modulation method
A technology for controlling circuits and rectifiers, applied to electrical components, output power conversion devices, and converting AC power input to DC power output. problem, to achieve the effect of small switching loss, excellent efficiency performance, and high converter efficiency
Active Publication Date: 2022-04-29
HOHAI UNIV
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Prior art literature "W.Zhu, C.Chen, S.Duan, T.Wang, and P.Liu, A carrier-based discontinuous PWMmethod with varying clamped area for Vienna rectifier, IEEETrans.Ind.Electron., vol.66 , no.9, pp.7177-7188, Sept.2019." Proposed a hybrid modulation strategy based on carrier-based SVPWM (CB-SVM) and CB-DPWM, the introduction of CB-SVM solved However, the use of CB-SVM will inevitably increase the switching loss, and when the modulation ratio is low, the ability of this method to adjust the midpoint potential will be greatly weakened
Prior art literature "K.Li, M.Wei, C.Xie, F.Deng, J.M.Guerrero, and J.C.Vasquez, Triangle carrier-based DPWM forthree-level NPC inverters, IEEE J.Emerg.Sel.Topics Power Electron, vol.6, no.4, pp.1966-1978, Dec.2018." By switching the clamp mode to adjust the neutral point potential balance, but the switching of the clamp mode will introduce additional switching action and reduce the efficiency of the converter. It is an inevitable problem in midpoint potential adjustment
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[0033] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0034] Such as figure 1 Shown is an existing three-phase Vienna rectifier 10 and a control circuit 20 designed by the present invention.
[0035] Such as figure 1 As shown, the three-phase Vienna rectifier 10 includes a three-phase AC power supply 101 / u sa , u sb , u sc ;Three-phase input filter inductance 102 / L a , L b , L c ; The first to sixth power diodes 103 / D 1 ~D 6 ; The first to sixth power switch tubes 104 / S 1 ~S 6 ; The first DC bus filter capacitor and the second DC bus filter capacitor 105 / C dc1 、C dc2 . The six power diodes are connected in pairs to form a three-phase bridge arm, the six power switch tubes are connected in pairs to form a three-phase bridge arm, and the first DC bus filter capacitor and the second DC bus filter capacitor are respectively connected to Both ends of the midpoint of the DC side. R in...
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The invention discloses a control circuit of a three-phase Vienna rectifier and a discontinuous carrier wave mixed modulation method thereof. The control circuit includes a grid voltage sampling circuit, an inductor current sampling circuit, a bus voltage sampling circuit, a switch tube drive circuit and a DSP control unit; the DSP control unit includes a first abc / dq converter, a second abc / dq converter, a lock phase converter, dq / αβ converter, HCB‑DPWM controller, hysteresis controller, bus voltage PI regulator, active current PI regulator and reactive current PI regulator. The discontinuous carrier hybrid modulation method can realize the unbalanced operation of the midpoint potential of the Vienna rectifier without causing current distortion on the AC side, avoiding the switching loss introduced by the traditional midpoint potential adjustment method; The adjustment of the midpoint potential broadens the applicable working conditions of this method. The invention can effectively control the midpoint potential, reduce switching loss and improve converter efficiency.
Description
technical field [0001] The invention belongs to the technical field of power electronic converters, and in particular relates to a control circuit and method of a three-phase Vienna rectifier. Background technique [0002] The three-phase Vienna rectifier is widely used in aviation power supply, electric vehicle charging and other fields due to its advantages of high reliability, high efficiency and low current harmonic distortion. In the application of aviation primary power supply, it is often desired that the converter has a higher switching frequency. On the one hand, high switching frequency can reduce the volume and weight of the converter and obtain higher power density; on the other hand, the fundamental frequency of aviation power grid is high, and high switching frequency can help reduce current harmonic distortion and improve power factor. However, high switching frequency will bring higher switching loss and reduce system efficiency. Compared with traditional s...
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IPC IPC(8): H02M7/219
CPCH02M7/219
Inventor 张犁明岩邹宇航张哲
Owner HOHAI UNIV