A power decoupling control method for the regenerative cascaded-H-bridge-based motor drive
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Abstract:
The cascaded H-bridge (CHB)-based medium-high voltage motor drive suffers a severe 2nd-harmonic ripple power problem on the DC side, especially under low output frequency conditions. Currently, strategies to address this problem include increasing the DC capacitors or adopting active power-decoupling methods that require extra switches and passive components. This paper proposes a novel power decoupling control method for the regenerative cascaded multilevel motor drive converter. Considering the inherent balance of the ripple power in the three phases and the special topology of the regenerative CHB-based motor drive, this method induces a negative-sequence current with special frequency into the active front end of each power module to transfer the ripple power of all power modules into the core column of the input transformer, allowing them to counteract each other. In this way, the 2nd-harmonic ripple of the DC voltages are eliminated without the need for additional components or impacts on the input and output power quality, which can greatly decrease the requirement for DC capacitors.Keywords:
H bridge
Decoupling (probability)
Motor drive
Power Electronics
Correction magnets of synchrotron storage ring are served with linear power supplies (correction power supply) with 100 ppm output current ripple in National Synchrotron Radiation Research Center. Reducing output current ripple of correction power supply might reduce perturbation of beam position of storage ring. Replacing correction power supplies with lower output current ripple ones is straightforward but costs lots of money. Without adding any other circuit and electronic component, some components of correction power supply are replaced by ones with more precious and lower output fluctuation; so that the same circuitry structure of correction power supply is kept without increasing its complexity and could reach 25 ppm output current ripple
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The ripple of switching power supply is defined.The reason of generating the ripple is analyzed.Several solutions to reject the ripple are proposed in this pepper.Aiming at a special switching power supply,the output stability of the switch power supply is described.This power supply which is used to drive semiconductor laser can output the 12 V voltage and 10 A current.Several methods of ripple rejection such as filtering,multi-channel superposition and so on are studied to reduce the ripple of output current and improve the stability of laser power.The integrated power supply is divided into two parts,the major power supply and minor power supply.The ripple signal which is collected in the major one will be send to the control end of minor one.That can make output ripple of major and minor ones smaller.This method can keep the ripple within 1% which was verified in experiments,and improve the performance of the power supply.
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Effects of ripple width in rippled-spectrum signals on ripple density resolution was investigated. Two measurement paradigms were tested: (i) ripple density resolution for discrimination between two rippled signals and (ii) discrimination between a rippled test signal and non-rippled reference signal. The ripple widths varied from 9% to 64% of the ripple frequency spacing. For both paradigms, the ripple density resolution increased with deceasing the ripple width. For discrimination between two rippled signals, the resolution was 8.1 ripples/oct for a ripple width of 64% and increased to 15.1 ripples/oct at the ripple width of 9%. For discrimination between a rippled test and non-rippled reference signal, the resolution was 9.3 ripples/oct at a ripple width of 64% and increased to 85 ripples/oct at a ripple width of 9%. Discrimination between two rippled signals is hypothesized to depend on ripple depth in the excitation pattern; the depth increases with narrowing the ripple width. Discrimination between a rippled test and non-rippled reference signal is hypothesized to depend on temporal processing; the effect of the ripple width appears due to increasing the ratio of the autocorrelated to uncorrelated components of the input signal with narrowing the ripples.
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Uncorrelated
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The high voltage generation mode and ripple suppression of 100kHz switching power supply are studied in this paper. The structure of the power supply system is designed by the power supply simulation software Simplis, two kinds of power supply system structures are built by the single secondary winding transformer and the multiple secondary windings transformer respectively, and the ripple suppression design of their output high voltage is simulated and analyzed. The simulation results show that the low-pass characteristic of RC integrating circuit can be used to filter the high-voltage ripple, which can effectively suppress the ripple and improve the stability of the power supply.
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This paper deals with the analysis of the input dc-link voltage ripple in multilevel inverter based on H-bridge and level doubling network (LDN). The LDN is basically a half-bridge fed by a floating capacitor, with voltage self-balancing capability, recalling the concept of a flying capacitor configuration. The amplitude of the LDN voltage ripple is analytically determined considering both the low-order and the switching harmonic components. In particular, peak-to-peak distributions of voltage ripples over the fundamental period are analytically determined, making possible the design of dc-link capacitor relying only on the dc-voltage ripple requirements. The case study makes reference to negligible switching ripple in the output current. It well represents either grid connection or passive load having almost sinusoidal currents. Numerical simulations carried out by MATLAB/Simulink and a complete set of experimental verifications are given to confirm the theoretical developments.
H bridge
Harmonic Analysis
Grid connection
Harmonic
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It is critical for buried target detection via ripple scattering to know the ripple structure, e.g., the ripple height and spatial wavelength. In the present paper, backscattering data from a 300-kHz system show that ripple wavelength and height can potentially be estimated from backscattering images. Motivated by the backscatter data, we have developed a time-domain numerical model to simulate scattering of high-frequency sound by a ripple field. This model treats small-scale scatterers as Lambertian scatterers distributed randomly on the large-scale ripple field. We have found that this approach characterizes the field data well. Numerical simulations are conducted to investigate the possibility of remotely sensing bottom ripple heights and wavelength.
Backscatter (email)
Ripple marks
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This paper analyzes the mechanism of ripple generation,summarizes characteristics of the ripple and its effects on load,and puts forward a discussion of methods for measuring ripple of DC stabilized power supply.
Ripple marks
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Hysteresis
Ripple marks
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When a solid object or wheel is repeatedly dragged on a dry sandy surface, ripple patterns are formed. Although the conditions to form ripple patterns have been studied well, methods to eliminate the developed ripple patterns have not been understood thus far. Therefore, history-dependent stability of the ripple patterns formed on a sandy surface is investigated in this study. First, the ripple patterns are formed by sweeping the flat sandy surface with a flexible plow at a constant speed. Then, the sweeping speed is reduced, and the variation of ripple patterns is measured. As a result, we find that the ripple patterns show hysteresis. Specifically, the increase in amplitude of ripples is observed when the reduced velocity is close to the initial velocity forming the ripple pattern. In addition, splitting of ripples is found when the reduced velocity is further decreased. From a simple analysis of the plow's motion, we discuss the physical mechanism of the ripple splitting.
Hysteresis
Ripple marks
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In order to decrease the ripple coefficient of switching power supply,the isolated CUK type switching power supply was researched.Based on the switch mode of power supply,the constraint equations between the ripple current of power and magnetic components were deduced.With the equations,the conditions of zero ripple current input and zero ripple current output were discussed.Moreover,the magnetic integration realization method of CUK type power supply was analyzed.Simulation results validated the conclusions.
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