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This paper describes a transformerless STATCOM (Static synchronous compensator) based on the MMCC-SDBC (modular multilevel cascade converter — single-delta bridge-cells) for independent control of positive- and negative-sequence reactive powers. A three-phase 200-V 6-kVA experimental system is designed, constructed and tested to verify the effectiveness of the topology and the control method including...
This paper proposes a three-phase six-inductor double-switch PFC circuit which is suitable for high frequency UPS application. This PFC circuit not only achieves high power factor correction in grid-connected mode of UPS, but also improves bus voltage in battery mode of UPS. This new PFC removes the independent boost design in common UPS and the whole cost can be reduced. The topology structure and...
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...
A single phase transformer-less inverter is introduced in this paper. The negative polarities of the input voltage and output terminal have common ground. Therefore, the leakage current problem that is common in PV systems is eliminated naturally. In addition, the proposed inverter has fewer components compared with its counterparts and only one switch conducts during the active states which enhance...
In this paper, the choices of different design input parameters are investigated to evaluate their effects on the performances of rotor-tied and conventional doubly fed induction generators (DFIGs). The stack aspect ratio, teeth and core flux densities are selected as key input parameters whose choices significantly affect the performance of DFIGs. The secondary side voltages, which affect the secondary...
This paper presents a study of the operating performance of an efficient high power and low cost three-phase and three-level power rectifier as a complementary reactive power source. Simulation and experimental (final version) results are presented to support the above ideas.
The paper's aim is to present the implementation details and results drawn from a solid state transformer (SST) prototype built on Silicon Carbide (SiC) MOSFETs, using a nanocrystalline-based high frequency transformer. Such combination becomes highly attractive from the viewpoint of feasibility for attaining the rating of an actual distribution transformer using simplest arrangements, which become...
This paper proposes a self-tuning model predictive direct power control (MPDPC) strategy for power flow control and power quality improvement in grid-connected power converters. At each sampling instant, a fuzzy logic controller is used to determine online the best weighting factor values for a given operating point. These values are then used to solve the multi-objective optimal control problem associated...
This paper presents an improved single phase seven-level active rectifier architecture controlled by finite control set model predictive control (FCS-MPC). The FCS-MPC is designed to enable power conversion with a unity power factor and generate seven level voltage waveform at the input. The proposed active rectifier architecture reduces harmonic contents of the rectifier input current by producing...
In this paper, a new DC ice-melting scheme based on hybrid modular multilevel converter (MMC) is proposed considering the problems of existing DC ice-melting device, such as high harmonic content, complicated mode switching operation, large size and so on. In the scheme, a novel structure of MMC is composed of the upper bridge arm all using full bridge sub-module (FBSM) and the lower bridge arm all...
As the compensation type is important in an inductively coupled power transfer system, a novel LCC/S compensation topology has been proposed in this paper, which features the advantage of the adjustable constant gain with zero voltage switching turn-on. The symmetric T type high-order compensation type is specifically introduced in this paper, which is not sensitive to the parameter deviation and...
In order to simulate the varied kinds of current and meet the acquirement on the different power, this paper proposes a multifunctional DC electronic load. The proposed DC electronic load is composed of many cascaded current simulation units. The number of units is according to the input power rating. Each unit is based on the combination of buck and boost converter, which is able to simulate both...
Performance of multilevel inverters (MLI) are distinguished because of their low harmonic waveform generation, low filtering requirements on AC side and high voltage application. Among different (MLI) topologies, cascaded multi-level inverters (CMLI) are easier to implement and are much more cost effective. The main drawback of multilevel inverters is requirement of more than one isolated DC source...
Isolated grid-connected inverters are typically constructed of two stages, namely a voltage-source inverter stage and an isolated bidirectional dc-dc converter stage. Recently, two dual-bridge isolated series resonant dc-dc converters are used to synthesize segments of the line current and reconstruct the complete sinusoidal line currents using a three-phase unfolder. The unfolder technique synthesizes...
An HVDC system based on a Cockcroft-Walton (CW-HVDC) topology is presented and a novel strategy is proposed to analyze and control the converter. In the connection to the grid the CW-HVDC uses a 3×2 matrix converter. The CW-HVDC voltage state-space vectors are derived and used to control the AC currents, guaranteeing nearly unitary power factor in the connection to the grid. Sliding mode controllers...
This paper studies the segmented thyristor controlled reactors ST CR used to control the inductive reactive power with zero harmonic content in the developed current. This paper explains how to use STCR to produce inductive reactive power with discrete steps of operation from zero to full reactive power rating of the inductor. Paper studies several topologies used as STCR and illustrates the specifications...
This paper proposes a single-phase UPFC topology using an autotransformer structure. The proposed topology uses a N:1 transformer, which is connected as an autotransformer and a power converter module which consists of a single-phase half-bridge converter and an inverter. Also, the three-phase system can be comprised of three single-phase UPFCs. In three-phase system, while the conventional UPFC topology...
In recent years, direct current power (DC) supply systems have been applied in various types of industrial equipment. As a common practice, an alternating current(AC)/DC converter will be introduced at the system front end to convert mains into DC power sources for system operation. However, when connecting to a power grid, under the influence of load-end characteristics, the phase difference between...
Voltage control zones are commonly used within power systems, for applications like Secondary Voltage Control and localized reactive power markets. The idea is to partition a power system into zones that are weakly coupled in terms of voltage control. Conventionally, these control zones are defined with a deterministic approach and are fixed. However, recent research has demonstrated that they may...
This paper provides optimal design of new topologies of the thyristor controlled reactors TCR used in static VAR compensators systems SVC with zero harmonic content. The paper discusses the principle of operation of the new topologies which depends on thyristor switched reactors TSR. The objective function and its constrains to get optimal design of such topologies are suggested to get proper reactive...
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