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PR controller in stationary frame which is equivalent to PI controller in synchronous frame has been widely used in the application of PV inverters. While little attention has been devoted to VR(vector-resonant) controller in the application of PV inverters. VR controller in stationary frame is equivalent to VPI(vector PI) controller in synchronous frame, which takes decoupling into consideration...
Grid connected photovoltaic inverters always adopt a cascade control system in interfacing photovoltaic cells for maximum power point tracking purposes. Unbalanced gird voltage generate a double frequency component in the dc-link voltage. Either selecting larger capacitance value or decreasing the crossover frequency of the dc-link voltage control decreases distortion of grid current references. Large...
A voltage source inverter-fed synchronous magnet synchronous motor (PMSM) produces torque ripple due to application of pulsewidth modulation (PWM) method. Torque ripple is influenced strongly by the PWM strategy. A Hybrid SVPWM (HSVPWM) technique is presented to reduce torque ripple of PMSM. The method employs both conventional sequences and advanced bus-clamping switching sequences, which apply an...
In recent years, there have been an increasing number of photovoltaic (PV) generators integrated into the modern distribution power network. However, the introduction of a large number of PV units could have a negative impact on the distributed PV grid-connected power generation systems, such as polluting the grid, and causing grid instability, even resulting in the voltage collapse if the relevant...
In this work an improved Space Vector PWM (SVPWM) scheme is proposed for a three-phase thirteen-level inverter. The proposed topology has a reduced number of space vector and redundant switching states, and the space vector PWM scheme presented solve the problem of computational complexity in the control of semiconductor devices. Based on this control strategy, the location of the reference voltage...
In the present paper, a three-dimensional space vector PWM (3-D SVPWM) algorithm for multilevel converters with digital signal processing is implemented. This modulation technique uses the minimum number of tetrahedrons inside a cube, where each tetrahedron has four vertices which permit to generate a reference voltage vector. The algorithm uses a maximum of three comparisons to calculate the right...
Controllability of the nine-switch inverter is studied with the switched linear system model. On the basis of analysis results, a novel space vector pulse modulation (SVPWM) strategy is proposed. Compared with the classic SVPWM strategy, the number of operation modes used in the novel modulation strategy is reduced by half, therefore the switching sequence of the vectors can be simplified. In addition,...
A propulsion system for hybrid electric vehicles and electric vehicles contains DC voltage supply, DC link capacitor, three phase voltage source inverter and a three phase AC machine. The key role of the inverter is to convert DC voltage to three AC voltages which commands the motor. The electrical machine is chosen to have the phase voltages in star connection and the common node of the phase voltages...
In this paper two operating modes available for permanent magnet synchronous machines (PMSM) are presented. This study aims to increase the efficiency of the motor-pump system. The PMSM is driven at variable speed and the inverter is controlled by space vector modulation theory. This study allows changing the component that produces magnetic flux (id), while the torque current component of PMSM (i...
This paper presents short review of both conventional and non-conventional methods of synchronized space-vector pulsewidth modulation (PWM) for three-level and multilevel inverters and ac drives. Accent has been done on overview of specialized techniques and algorithms of space-vector modulation, allowing continuous voltage waveform symmetries of multilevel systems in the whole control range for any...
In this paper, a new control strategy for Direct Torque Control (DTC) of dual two-level VSI fed 3-phase induction motor drive in an open end winding configuration is presented. The drive can be operated in dual mode; open-end winding or conventional single-sided supply configuration; based on the condition of the motor speed. A block of Optimum Status Detection & Mode Selector (OSD & MS) is...
A space vector based bang-bang controller driving a rotating target system (space vector bang-bang controller with flux related hysteresis shape SVBF) such as a machine or an ac-power-supply is discussed in this paper. A two-level, three-phase conventional inverter is used as means of power conversion. The advantages such as a low switching frequency as well as further opportunities of the SVBF are...
The damping of vibrations on aircrafts and rotorcrafts can provide life extension and weight reduction on those structures on which the vibration load is a significant amount of load endurance spectrum. In this work, a hybrid active-passive inertial actuator system is presented. It is based on a ballscrew based actuator, and the power generation is provided by an open windings three phase motor controlled...
In this paper, two modulation strategies for a three level neutral point clamped inverter SynRM drive are compared. The inverter uses two different algorithms called Mod-1 and Mod-2 for balancing the two dc bus capacitor voltages (suppression of the neutral point voltage). These modulation strategies are of the nearest three vector (NTV) family. Mod-1 chooses certain vector states to suppress the...
A drive train system (DTS) powered by an ideal voltage source and driving a permanent magnet synchronous motor (PMSM) is discussed in this paper. A two-level, three-phase conventional inverter with no harmonic filters on both AC and DC sides is used as means of power conditioning. This DTS is modelled as a double oscillator according to a drive train in an electric vehicle. Various inverter modulation...
An, offline fault detection strategy for the finite field inversion operation of Advanced Encryption Standard (AES) is presented in this paper. The AES inversion units are stimulated using conventional Test Pattern Generation methods and the results' correctness is evaluated by means of signature analysis. The proposed architecture rely on connecting several inversion operation together in order to...
This paper presents a new 3-level direct self-control (DSC) scheme for induction motor drive by selecting proper voltage vector for different speed operational. In conventional DTC two different voltage vectors are assigned to vary flux for low speed, medium speed and high speed motor operational. This paper proposed a scheme where only a single voltage vector is applied during low speed, medium speed...
Multilevel inverters brought a tremendous revolution in high power superior performance industrial drive applications. Minimizing harmonic distortion is a challenging issue for power electronic drive. This problem can be solved by developing suitable modulation technique. There are number of modulation techniques established in the last decade. Among them, the space vector pulse width modulation (SVPWM)...
In this paper, the advantage of using open-end inverter topology which can provide greater number of vector selection in minimizing the output torque ripple of Direct Torque Control (DTC) of 5-phase induction machine was proposed. By employing Dual Inverter Fed Open-End winding topology, it provides 132 effective voltage vectors where each vector may give different effect on controlling performance...
Pulse width modulation controlled inverters produce Common-Mode Voltage (CMV), which is the main culprit of many system drawbacks ranging from Electromagnetic Interference (EMI) issues to bearing damage and insulation aging. Former methods for common-mode voltage reduction based on voltage control cause a great deal of extra harmonic distortion in output currents. In this paper, a method named as...
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