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In this paper, a new three-phase hybrid seven level inverter topology with a single DC supply is proposed for the first time. The proposed inverter is realized by cascading two three level flying capacitor inverters with a half bridge module. The inverter topology is having multiple switching state redundancies for each of the pole voltage levels. By using these switching state redundancies, capacitor...
The paper discusses the design principles of configurable control systems for electric drive instructional laboratories. Adopting this approach a control structure is assembled at software level using a number of control elements and compiled into control algorithm of a real-time DSP board. To ensure comprehensive and safe test execution, all control elements operate under the supervision of a real-time...
One of the most important requirements for grid-connected inverters is an accurate control of the line currents. Applying the “switched diamond hysteresis control (SDHC)” to multilevel inverters combines the advantages of both techniques and is an enabling step towards a better inverter performance than using state of the art controllers. The hypotheses are further investigated in a real hardware...
In this paper, a five-stage fault protection scheme against the short-circuit fault for parallel high-power three-phase combined inverter to achieve high reliability is proposed. There are two control modes, Voltage Controlled Mode (VCM) and Current Controlled Mode (CCM). VCM operates under normal operation to keep constant output voltage. CCM operates under fault operation to limit the output current,...
Variable carrier frequency control of PWM inverter based on deadbeat control using SoC-FPGA based hardware controller was proposed. The inductor current was controlled using digital hysteresis method and the output current was controlled using deadbeat control with disturbance compensator. As the result, the control accuracy and the efficiency of the inverter can be adjustable with superior tracking...
A space-vector hysteresis modulation (SVHM) technique is presented in this paper for three-level neutral-point-clamped (TL-NPC) multilevel inverter for active power filter (APF) applications. The main responsibility of this modulation technique is to force the actual current to reach the reference current and, simultaneously, balance the capacitor voltages. This scheme is implemented in the stationary...
In this paper, the performance of space vector pulse width modulation (SVPWM), sinusoidal pulse width modulation (SPWM) and hysteresis current control (HCC) control techniques used in power control with back to back converter of permanent magnet synchronous generator used in wind turbines are comparatively analyzed in terms of dynamic response, total harmonic distortion (THD), torque ripple and current...
This paper presents modeling of existing proprietary-based 1.6 kWp single-phase grid-connected photovoltaic (PV) system in Electrical Energy Conversion Research Laboratory (EECRL) of School of Electrical Engineering and Informatics (SEEI), Institute of Technology Bandung (ITB). The PV system was a grant from Indonesia State Utility Company (PT. PLN), included with the propietary inverter. Although...
Hysteresis current control is an attractive nonlinear current-control method for voltage source inverters when a fast system response is required. A well-known disadvantage of hysteresis current control is that the system has to operate over a wide switching frequency range. This causes an increase in the switching losses of the system and increases the difficulty in designing the output filter. The...
A Hysteresis current control (HCC) modulation is commonly used because of its various advantages. However, the HCC modulation has the disadvantage that the modulation frequency varies in a fixed band and, consequently, produces non-optimum current ripples. To overcome this drawback, an adaptive hysteresis-band current control (AHCC) modulation has been suggested. However, when the AHCC is employed...
A current error space vector based hysteresis controller for two-level voltage source inverter fed Induction Motor drives is proposed in this paper. All inherent advantages of conventional hysteresis controllers like fast dynamic response, simple implementation, switching in one phase at a time etc. are also retained in the proposed controller . The harmonic spectrum of phase voltage obtained using...
This paper presents the principle of Direct Power Control (DPC) and Voltage Oriented Control (VOC) for a three-level Neutral point clamped (NPC) grid connected inverter. Considering balancing of the neutral point, a switching table with neutral point voltage control is derived for DPC. The two control algorithms are successfully implemented in a test bench, and an experimental comparison is conducted...
This paper presents three-phase current source inverter with hysteresis control in voltage source mode. Analysis of the output characteristics of the converter was made. The voltage source mode for current source inverter was considered. A computer model of three-phase current source inverter and control system with hysteresis control was developed. The basic diagrams illustrating working capacity...
This paper presents a transformerless electronic converter topology for PDLC applications. In order to meet the PDLC ON/OFF state requirements, the converter must be able to supply an AC @1 kHz signal with different voltage levels, which correspond to different transparency levels. The converter will be connected directly to the electrical socket outlet and will use three conversion stages (AC - DC,...
The Hysteresis current control (HCC) is a popular modulation technique used in active power filter (APF) applications owing to its simplicity of implementation, fast current response and peak current limiting capability. Despite these advantages, it has a major disadvantage when applied to three-phase isolated neutral point (INP) systems: interphases dependency causes very high-switching frequencies...
Integration of the renewable source in the distribution network under varying load profile is a daunting task. This paper presents the PV system with battery energy storage to improve the distribution network utilization. The load profile of the distribution systems demands the reactive/real power support to maintain the voltage profile and better efficiency in the power utilization. The addition,...
In order to improve reliability and safety of an In-Wheel Motor, the Wireless In-Wheel Motor (W-IWM) using magnetic resonance coupling has been proposed. Transmitting power of the W-IWM is controlled by the primary inverter and the secondary converter. One of a technical issue of the W-IWM is transmitting power variation due to the load power variation and the coupling coefficient variation. In this...
A recently developed control method for multiphase induction machine drives termed the Brush-DC Equivalent control has presented a simpler control strategy that does not use any complex transformations. It has been implemented using a hysteresis current controller and in this paper, a delta modulated current control technique is presented. Delta modulation is proposed in to replace hysteresis control...
In this paper, a simple current error space vector (CESV)based constant switching frequency hysteresis controller for two level voltage source inverter fed Induction Motor(IM) drives is proposed. The controller have all inherent advantages of space phasor based hysteresis controllers such as fast dynamic behaviour, easy implementation, adjacent voltage vector switching in addition to elimination of...
This paper presents two new Schmitt trigger circuits with eight enhancement-type MOS transistors are introduced in this paper. These two Schmitt trigger circuits are implemented based on current sink and current source inverters. The hysteresis curves of the proposed Schmitt triggers are presented, hysteresis width depends on the supply voltage and transistor geometry. These circuits are preferred...
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