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This paper proposes a current control strategy with zero steady-state tracking error for grid-connected boost-inverters. Two boost converters are controlled separately to achieve both output current tracking and balanced output voltages. Based on cascading control and feedback linearization, the inner and outer-loop controllers are derived combining the inversion of boost converter model and the output...
Domestic induction heating is a well-consolidated technology that is evolving in order to obtain new products combining three key aspects: performance, efficiency, and cost. New development tendencies suggest the use of multi-inductor architectures to improve the user performance. These systems require the development of new power converters adapted to the new architectures to achieve an efficient...
In this paper, a high gain single-stage buck-boost grid-connected system is proposed. The proposed system consists of a high voltage gain - high efficiency - switched inductor buck-boost converter (SIBBC) and a folded cascade H-bridge inverter. The proposed converter switch is derived with a sinusoidal modulation, so that the converter output voltage is a rectified sine wave which requires only a...
This paper proposes a photovoltaic lighting system based on a power converter that combines the Z-source and the quasi-Z-source topologies. When there is enough sunlight the power converter operates similarly as the quasi-Z-source topology and thus the photovoltaic energy is stored in a battery bank. In the absence of sunlight the power converter operates similarly as the Z-source topology for powering...
Grid interaction of DG units with a novel hybrid flying capacitor multicell converter which is suitable for hybrid systems, is presented in this paper. Multicell inverters have important advantages which make them a flexible solution for medium voltage/high power applications such as: lower rating of switches and lower output voltage THD. Proposed configuration of multicell inverter requires less...
This paper gives the State Space modeling of Distribution Static Synchronous Compensator (D-STATCOM). It is important to keep the voltage constant in the distribution system, hence voltage regulation is required in the distribution network. Voltage Source Converter (VSC) based D-STATCOM achieves voltage regulation in the connected bus by absorbing/supplying the required reactive power. The capability...
In Multilevel Inverters, Cascaded H bridge converters are considered to be the most preferred form of converters. But in these converters as the number of staircase levels in output voltage increases the dc source requirement also increases, thereby limiting its application. This paper tries to address the above mentioned problem by developing a Modified version of Cascaded Multilevel Converters which...
This paper proposes a high power-factor electronic ballast for metal halide lamps. In the proposed circuit, two buck-boost converters and a buck converter are integrated with a full-bridge inverter of which the four active switches are shared. Two active switches are switched at high frequency, while the others are switched at low frequency. The buck converter is used to step down the dc-link voltage...
This paper presents the development of the Controller and efficient Control algorithms for enabling modularity and bus paralleling of High Power Converters employing high speed Controller Area Network bus (CAN). Presently paralleling of Converters requires common current sensors to sense the load current, which restricts the level of redundancy of the system as well as limits the number of Converter...
In small-scale grid-connected wind energy conversion systems with DC-link energy storage components, traditional PWM technology is usually used to produce sine wave output current. However, for the converter topology without DC-link energy storage components used in the wind generation system with a high-inductance permanent magnetic synchronous generator, the DC current in the DC-link of the converter...
Self-excited induction generators (SEIGs) have a significant potential for application in small scale wind energy generation systems due to their robustness, lower cost and lower maintenance requirements. This type of generator is often incorporated with variable speed wind turbines where maximum power extraction is possible. In such applications, SEIG is intensively used with full-sized converter...
In this work, a Back to Back converter based on a Diode Clamped Multilevel topology is presented. Both converters are controlled using model predictive approach. The control objective of the front-end converter is the DC bus voltage regulation with sinusoidal current and unity power factor, while the load converter drives an induction motor through predictive direct torque control. Both algorithms...
This paper provides an alternative to the conventional back-to-back converter currently used within appliance motor drives. The novel approach suggests using IPM/IRAMS modules in building the power stage. Moreover, this novel power stage configuration does not include the bulky DC bus capacitor, and reduces the filtering requirements, resulting in a smaller and more reliable assemble. Complete description...
In this paper, authors propose a novel fourteen-band hysteresis technique to control the fifteen level packed U cells (PUC) converter. This topology was first introduced. It combines advantages of the flying capacitor and the cascaded H-bridge topologies. The study of the novel converter allows the establishment of the switches gates signals equations. In case of rectifier operation, the proposed...
The stochastic fluctuating offer of wind energy limits the capacity of supply in electrical grids by means of technical and economical reasons. To increase the supply, a concept of dynamic conditioning with the objective to increase the quality of supply was developed. The concept envisages support and management of the electrical grid respectively through compensation of active and reactive power...
This paper presents a field programmable gate array (FPGA) implementation of a digital circuit that measures in real-time the first harmonic load impedance of medium-frequency (25 kHz-70 kHz) induction heating cooking appliances. The load impedance of a planar inductor coupled to a pan depends on the geometry, pan material, temperature, and frequency. Real-time load measurement is desirable for a...
This work presents a brief description of stage integration for photovoltaic system converters. In low power PV applications the output voltage available is low and a boost stage is necessary for regulated stand-alone or grid-connected. In the most usual topologies, the boost stage and the inverter stage are separated and cascaded. It simplifies the control schemes and it improves the power decoupling...
A Hard Disk Drive (HDD) spindle motor is a brushless dc (BLDC) motor which has been used in high speed applications due to its high efficiency and good controllability. This paper presents a novel topology for a low cost converter which drives a spindle motor at high speed with high starting torque using the bipolar starting and unipolar running algorithm. This topology is simple and uses only eight...
Many voltage source converters have no redundant power components (e.g. IGBT modules) built in. Therefore if one power component fails, the converter stops working. Here we introduce a generic approach that takes advantage of the inherent redundancies of voltage vectors in multilevel converters in order to actively extend the lifetime of converters. When detecting increased stress of one IGBT module,...
This paper presents a current control for single phase grid connected inverters. The method allows for inverter active and reactive power control. The method uses the Direct-Quadrature (DQ) synchronous reference frame transformation for single-phase converters. This method transforms an orthogonal pair consisting of the inverter output current and a time shifted version of this current from a stationary...
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