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This paper proposes the reconfigurable RX analog baseband transformer that supports multi-standard applications. The proposed ABB can transform its structure between a delta-sigma modulated ADC for narrow band and a baseband LPF for wide band with a simple switch configuration without extra cost. Thus, the ABB obtains efficiency in both size and power aspects. It occupies only 0.11mm2 of active area...
Since the capacitor equivalent series resistance (ESR) above 1kHz almost stays constant, dc-link current root-mean-square (RMS) closed form equation is an easy way to evaluate the capacitor losses from the switching harmonic currents (SHCs). But when the ac current contains multiple low order harmonics (LOHs), their impacts on the dc-link has not been systematically studied. In this paper, a straightforward...
Regenerative drives, also known as four-quadrant drives are integral part of many industrial applications ranging from wind power generation, elevators, escalators, pump jacks used in oil fields to centrifuges, etc. All regenerative converters need passive LCL filters to filter out PWM frequency components. One disadvantage of using an input LCL filter in front of regenerative converters is that they...
The control of the grid side current in an LCL filter based grid connected converter is generally complex and involve multi loop structure. This paper presents a method to control the grid current indirectly by controlling the converter side current with compensation of the filter capacitor current. The proposed control algorithm uses only one current sensor to measure the converter side current....
Recently, many high-efficiency buck-boost typed inverters for the photovoltaic (PV) grid-connection applications have been proposed. However, the PV grid-connection inverters are in idle state at nighttime or low insolation. Based on green energy demand, the presented work proposes a high-efficiency bidirectional buck-cascaded buck-boost (BuCBB) inverter. It is developed via the connection of a bidirectional...
The power decoupling strategies of single-phase Z-source/quasi-Z-source inverter (ZSI/qZSI) to handle the inherent double-line-frequency (2ω) power are overviewed. They are categorized as passive and active power decoupling methods. The former suppresses the 2ω ripple by the impedance network, modified modulation methods, or closed-loop damping control. The latter diverts the 2ω ripple to the compensation...
This paper presents the application of a modular multilevel cascade converter(MMCC) based on single-delta bridge cells(SDBC) as an active power filter(APF). It is required that the mean value of the DC capacitor voltages is controlled so that the tracking of the source current reference is guaranteed in operation of APF. This paper proposes a DC capacitor voltage regulation method for MMCC-SDBC under...
The aim of this paper is the design and implementation of the control algorithm of a PWM boost rectifier capable to handle bidirectional energy flow. For this goal, the boost rectifier control loops must be tuned for the proper operation of absorbing active power from the power grid and transfer it to the dc load at constant output voltage, and also to give the rectifier the ability to generate back...
The paper presents the methodology and design of testing structure dedicated to one laboratory model of a filtering and regeneration system (SISFREG) developed through the project number 42/2014, type Partnerships — PCCA 2013, which allows the conversion of the dc traction substations in "active substations". The configuration was made based on the actual conditions prevailing in a substation...
This paper presents the study, design and simulation of a laboratory module related to filters. With this laboratory platform it was accomplish a comparative study between current feedback (CFA) and voltage feedback (VFA). Because the laboratory platform has an educational role, it was presented some practical aspects of active filters measurement and also the differences between the measured values...
Although the mechanism of electric energy flow for nonsinusoidal conditions is well described today, so fare is not yet available a generalized power theory, and theoretical calculations for the design of such devices as active filters or dynamic compensators. Therefore the task of designing compensators for optimize energy transmission with nonlinear time-varying loads in nonsinusoidal regimes is,...
Input-series-output-series (ISOS) inverter system is very suitable for high input voltage and high output voltage power conversion applications. If the inverter system topology is applied to the grid-connected application, a large-capacity inverter system can be built with multiple small-capacity standardized inverter modules, which will improve system reliability and simplify system design. For the...
This paper presents a new application of modular multilevel cascaded converters (MMCC) for combined active harmonic current elimination and reactive power compensation in a power distribution line. A technique for simultaneous extracting harmonic components and reactive element in the load current is presented. A novel voltage control scheme for balancing the module intra-cluster capacitor voltages...
Two-phase residential installations have become very common in Ecuador since different policies prompt the users to replace gas stoves and water heaters by electric appliances. The addition of a second phase to the originally installed single-phase wiring is required to obtain 220Vrms. This fact carries an intrinsic unbalance since single- and two-phase loads coexist. In this paper a topology for...
When photovoltaic systems are used as the energy source to start motors, the resultant voltage drop can be too large to enable effective starting. An active filter circuit using inductor energy storage is described, which can be used to maintain the output voltage. Simulation and experimental results are shown.
A new structure of the active RC low-pass filter (LPF) is proposed. This scheme is recommended as a second-order link in more complicated antialiasing filters and spectrum limiters in the input circuits of analog-to-digital converters. It is shown that in the low-pass filter under consideration an independent trimming of the main characteristics, such as a pole frequency, a pole attenuation, and a...
Aiming at the problems of slow dynamic response and high harmonic content for single phase magnetically controlled reactor (MCR), a comprehensive compensation system based on MCR and active power filter (APF) is proposed and the system topology is introduced. In the system, MCR is taken to compensate reactive power, while APF is taken to compensate harmonics generated by both load and MCR. Meanwhile,...
A novel Programmable Analog Array of fractional-order filters is proposed in this paper. It is constructed from an active core which is implemented using Current Feedback Operational Amplifiers as active elements. The scheme offers the realization of lowpass, highpass, bandpass, and bandstop fractional-order filter functions of various orders, and this is achieved through the utilization of resistor...
Inverters in back to back (B2B) connection are utilized to convert the voltage and frequency of the power source to another format. Typical application of inverters is the wind power system. This study presents a B2B inverter for equal voltage and frequency format conversion in which one inverter works to get power from the grid to charge the DC capacitor and another inverter returns most of the active...
An actively lossy parallel RL-type inductance simulation employing voltage differencing buffered amplifier (VDBA) as an active component is presented. The proposed grounded inductance simulator is realized with a single VDBA, one grounded capacitor and one floating resistor. The equivalent inductance value of the simulator can be adjusted electronically through the transconductance parameter of the...
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