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This paper presents the design of a low-power 7 GHz two-stage VCO for UWB systems using a 0.13 ??m CMOS technology with supply voltage of 1.2 V. Fully differential structure is utilized to achieve high substrate noise rejection and a new formula is derived which accurately estimates the VCO output frequency as a function of control voltage. The VCO has very large tuning range (4.22 GHz), covering...
The paper presents a complete mathematical analysis of a sinusoidal BLDC motor commutation. The motor is supplied from a DC source via a 6-leg inverter using the 120degON operation. The commutation period of 60 electrical degrees is divided into two sub-periods, for which the corresponding differential equations are solved using the initial and final conditions. The obtained model is simple to apply;...
In wind power generation system the grid-connected inverter is essential device for energy conversion and transmission, of which the performance has a direct influence on the entire wind power generation system. The inductance of AC side affects the static and dynamic performance of the whole system when the grid-connected inverter is actively inverting. So the design of inductance of AC side is essential...
A novel hybrid control based on digital variable-band hysteresis discrete pulse modulation (DPM) control and repetitive control is proposed for a 400 Hz inverter. The good dynamic response of the DPM inverter is obtained by the digital hysteresis control, and the steady state control performance is improved significantly by the repetitive control. By utilizing the variable hysteresis band, the stability...
To improve the output performance of cascaded H-bridge multilevel inverter under faulty conditions, this paper presents an optimized method suitable for harmonic cancellation while the faulty inverter are operated with neutral shift. With some parameters adjusted according to the fault type, the line to line voltages of the cell-fault inverter are increased than traditional control method, while keeping...
A significant problem with neutral-point-clamped three-level inverters is the fluctuation in the neutral-point voltage. When three-level inverter is loaded, the neutral-point voltage leads to the distortion on output voltage space-vector waveform of the inverter. A novel and simple judge rule based on the virtual space-vector is introduced. The mathematics models of neutral-point circuit and neutral-point...
For the mathematical model of PWM inverter under the d-q rotary coordinate system, there exists coupling between the active current and reactive current, which makes it difficult manipulating the power injected into AC grid from distributed generation system. So as to handle the problem, a novel current decoupling strategy based on the input-output linearization is employed in the paper and the PI...
This paper focuses on ideal operation status of the parallel inverter system. The limitation of conventional conclusion about ideal operation status of parallel inverters is discovered. And a new conclusion is introduced, that there will be no circulating current among parallel inverters when their unattached output voltages have the same frequency, phase, amplitude and be uniformly modulated. Simulation...
Renewable energy power generation technology, such as wind power and PV system, has developed rapidly nowadays. The wind/PV hybrid system has become a promising power generation form due to the natural complementary character of wind power and PV power. Storage devices are usually equipped in the hybrid system to constitute Micro-grid through appropriate energy management strategies to improve the...
Through analyzing the shortcomings of the control system on the traditional cutting inverter, this paper presents the double close loop control system based on pole assignment for cutting inverter, which based on phase shift full bridge zero voltage switched (PS-FB-ZVS). This paper builds the small signal mode of PS-FB-ZVS PWM converter, and assigns the double close loop PI parameters by pole assignment...
Because of the shortage of the IGCTpsilas series connection to obtain 6 kV output, the medium voltage drive (MVD) based on the H bridge neutral point clamped three-level inverter is introduced. Consequently, the arising of the common mode voltage (CMV) is discussed, the equivalent CMV circuit is deduced, and the common-mode circle currents are proposed in this paper. With the analysis of the relationship...
In the paper, a novel principle of variable reactor with a transformer and inverter control is proposed. A transformer with air gap is chosen and its primary winding is connected in series or parallel in power utility, the primary winding current of the transformer is detected and functioned as the reference signal. A voltage source PWM inverter is applied to produce a voltage, which is a controlled...
The permanent magnet brushless DC motor speed control system (PMBDCSCS) is simple control, high power density and high performance, and used in many domains. The voltage inverter used widely in the PMBDCSCS operates commonly in the six PWM methods: H_PWM_L_PWM, ON_PWM, H_PWM_L_ON, H_ON_L_PWM, PWM_ON and PWM_ON_PWM. In this paper, the six PWM methods are introduced in theory and are compared in detail...
This paper presents a design of a voltage controller of single-phase voltage source PWM inverter with LC filters. To compensate voltage distortion from non-linear loads, the resonant controller has been proposed. However, the design of the control system with the resonant controller is not clear. So we propose the design with the Coefficient Diagram Method (CDM).
The Selective Harmonic Elimination (SHE) PWM technique has become a significant PWM method for less switching loss for three-level neutral-point-clamped (NPC) inverter. This paper introduces an online optimization approach to the SHEPWM technology based on genetic algorithm and BP neural network. The method doesnpsilat need to preset the initial values and to predict the trend of these values over...
On the basis of analyzing three-level inverter direct torque control principle (DTC) , a new synthesizing vectors PWM method of three-level DTC is presented, which can not only effectively control neutral- point voltage, but also restrain higher dv / dt of output voltage and improve three-level DTC output performance ,reduce torque ripple. Through theory analysis and experiment research, the author...
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