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In this paper, we propose the method to realize high efficiency control for IPMSM (Interior Permanent Magnet Synchronous Motor). In this method, we pay attention to the torque equation. We realize high efficiency control by controlling the vector angle of stator current. As for the high efficiency control, we define the optimum angle as the stator current angle which makes the torque biggest against...
This paper presents the family of the single-inductor multi-output DC-DC converters. Conventional transformer-based multi-output DC-DC converters are proposed to provide multiple output voltages, which, however, have the drawbacks of high cost and large volume. Therefore, the single-inductor multi-output three-terminal configuration is developed in order to reduce the component count and cost for...
Low speed control is indispensable to several servo applications. Generally, motor speed obtained from the so-called M method is averaged by counting the number of pulses from the coupled encoder at a fixed time period. As a result, for speeds lower than the minimum measurable value determined by the sampling frequency and the resolution of the encoder, a long detection delay time may degrade the...
A systematic analysis for the multi-phase voltage source inverter (VSI) is illustrated in this paper. By applying the singular value decomposition, the instantaneous output voltage of VSI can be categorized into two complementary groups with the same magnitude and different sign to each other. The switching strategy for minimum conduction time which yields the maximum linear modulation index is proposed...
When a low voltage DC power source is used, a DC-DC converter with a high step-up voltage gain is required to raise the voltage to more applicable levels. This is typically achieved in classical converters which often have to be driven by pulse width modulation (PWM) waves with extremely high duty cycles. Although theoretically step-up converters can achieve an infinite gain as the duty cycle approaches...
This paper discusses the design of a low tip-speed ratio, drag type vertical axis wind turbine which is incorporated with permanent magnet synchronous generator with maximum power point tracking (MPPT) strategy of control system to acquire the optimal performance. By using two dimensional large eddy simulations (LES) method as fluid dynamic model, the calculated power coefficient for this multi-blade...
The design of a 1 MHz regulated multi mode charge pump using IBM7RF technology is described in this paper. This charge pump converts 2.7-4.5 V input voltage to a regulated 5 V output. The power stage includes nine PMOS switches and one NMOS acting as a controlled current source with 50% duty cycle. Together with three flying capacitors and the output capacitors, the converter can work in 2??, (3/2)??...
This research investigates the optimum solar panel installation angle for fixed solar panels to obtain the maximum annual energy collection at different latitudes using simulation equations. The simulated results were compared with the recorded data from the Weather Bureau for Taipei, Chiayi and Hungchun, respectively. The errors for daytime fair weather were all within 10%. Simulations were also...
Stochastic assessment is a method to predict the severity and number of voltage sags at a bus of interest in the transmission network system. In this paper, an analytical technique using impedance matrix is developed to predict the voltage magnitudes due to balanced and unbalanced faults at unlimited buses in an electrical network. The proposed technique was applied to an IEEE 24-buses electrical...
The selection criteria of dc-link capacitor based on the optimal ac line current regulation strategy for the single-phase grid-connected photovoltaic (GCPV) system is proposed in this paper. The power flow of the GCPV system and the optimal ac line current regulation strategy are presented. The optimal ac line current regulation strategy can achieve dc-link voltage regulation in one ac mains cycle...
We propose a universal field-oriented (UFO) control schemes for the rotor-side controller of doubly-fed induction generators (DFIG). The control block diagrams for different existing field oriented controllers (FOC), including stator flux oriented control (SFOC), rotor-flux oriented control (RFOC), and air-gap field-oriented control (AFOC), are unified in the same framework. Simulation comparisons...
This paper applies the selective harmonic elimination (SHE) technique to determine the switching angles for a multilevel inverter that cooperated with specially connected transformer, zig-zag connection. With the ability to direct controlling harmonics, SHE technique has the adaptability to associate with apparatus which are congenitally immune to specific harmonics, such as the zig-zag connection...
In general, power converters are nonlinear and time varying devices. Power electronic converters contribute significantly to the harmonic pollution of transmission systems. Being able to predict accurately the values of harmonics injected by the converters is essential for the power system planning and studies. Power converters can be classified into two types-line-commutated and force-commutated...
This paper presents the system modeling and analysis of the single-phase current regulation module (CRM) in continuous-conduction-mode (CCM) at steady state for use in the electrical discharge machines (EDMs). Based on the equivalent model of the three-terminal PWM switching cell, the small-signal equivalent circuit models of the single-phase CRM are obtained to derive the corresponding open-loop...
Capacity proportion frequency allocation compensation parallel control strategy based on the multiple synchronous rotating reference coordinates control is proposed to overcome difficulties in the field of high power application. The zero steady-state error compensation is implemented and the overall stability of the system may be improved by the multiple synchronous rotating reference coordinates...
The hybrid recurrent fuzzy neural network (HRFNN) control permanent magnet synchronous motor (PMSM) drive system using rotor flux estimator is developed to control electric motorcycle in this paper. First, the dynamic models of a PMSM drive system and electric motorcycle are builted though experimental tests and parameters measurements. Then, a HRFNN control system using rotor flux estimator is developed...
A motion control chip implementation method will be shown in this paper. The implementation is based on the Verilog HDL which is a popular tool for designing a special function FPGA, especially on the industrial field. There are several components needed in a control chip according to the motion control requirements. The major components are: encoder readers, PWM generators, subtracter/Adder, PID...
This paper proposes a modified one-cycle-control (OCC) scheme for regulation of three-phase pulsewidth-modulated (PWM) rectifiers under unbalanced and distorted supply conditions. Mathematical analysis is presented to show the dominant harmonic voltage across the dc-link of PWM rectifier when controlled by the existing OCC scheme. Such ripple voltage may aggravate the harmonic distortion in input...
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