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Buck and buck-boost ac-ac converter topologies with a center-point-clamped circuit configuration have been recently reported in literature. These converter circuits reduce the voltage stress on the bidirectional switches employed in corresponding direct ac-ac converters. This new topological structure enables access to the mid-point of voltage terminals. This paper introduces a family of such ac-ac...
SiC power devices exhibit low on-resistance and are capable of processing high switching frequencies at elevated temperatures. When SiC MOSFETs are employed as switch, minimizing switching power losses is crucial. A proper design of gate driving circuit for SiC MOSFET can ensure minimum losses, safe operation of the device and reliable performance. A comparative study of gate drivers for SiC MOSFETs...
A novel approach for mitigation of power quality issues have been presented in the paper. This paper introduces a Center-Point-Clamped AC-AC Buck-Boost Converter based power quality device for industrial and residential customers at the leaf end of the distribution network. This converter utilizes the principle of center-point-clamping to reduce the voltage stress on the power semiconductor switches...
Solar Panel Companion Inverter (SPCI) has been proposed as an H-bridge inverter embedded with a PV module. Each inverter converts the DC voltage output of the module, to a quasi-square wave voltage with variable pulse width. When these voltages are aggregated across multiple panels connected in a series string, they synthesize an AC waveform that can be interfaced with the power grid. The inverter...
Voltage Source Converter (VSC) based multi-terminal HVDC transmission system is an effective and reliable way for integrating off-shore wind power generations with onshore AC grid. In this paper, decoupled control of active and reactive power flow is established by modelling VSC controllers in synchronous d-q reference frame. A four terminal VSC-HVDC system is developed in PSCAD/EMTDC and simulated...
Photovoltaic energy is one of the key renewable energy resources of present day. Optimal usage of maximum power available from photovoltaic panels still remains an engineering challenge. Focusing on this issue, a novel photovoltaic power generation system based on a low voltage DC generation with panel level MPPT based on look up table, medium frequency square wave AC link, medium frequency transformer,...
The significant mechanical inertia of the rotor in a synchronous generator is crucial for facilitating the cooperative grid forming capability of multiple such generators on the transmission and distribution network. This paper demonstrates that the DC link capacitance in a PV inverter is the analogous form of inertia for such a system, albeit having much smaller magnitude. Furthermore it proposes...
A new approach for power line conditioning has been presented in the paper. State of the art line-conditioning devices like Static Voltage Restorer (SVR), Dynamic Voltage Restorer (DVR) and AC-AC power line conditioner offer higher bandwidth and low filter size requirement due to their high switching frequencies. However, commercial utilization of such devices is limited by the voltage blocking capability...
Proliferation of distributed energy resources (DERs) on the low voltage network comes with a myriad of power quality problems such as voltage fluctuations and poor harmonic performance. Distributed mitigation solutions are being proposed for the low voltage network which are similar to state-of-the-art solutions in medium voltage networks. This paper presents a μ-STATCOM device as a distributed solution...
Transmission of power over long distances has become an important aspect in today's world because of offshore generations from wind, ocean currents, tidal, waves and others. In general, HVDC technology is well-accepted around the world. The VSC-HVDC has gained importance over the years. Certain problems regarding protection still remain, but with the implementation of the hybrid breaker, the system...
A new approach for static reactive power compensation has been presented in this paper. Conventional thyristor controlled Static VAr Compensators (SVC) have inherent disadvantages like slow response times and poor harmonic performance as these FACTS devices are based on slow switching power electronics devices. Alternately, Pulse Width Modulated (PWM) dc-ac inverters and direct ac-ac converter structures...
A battery energy storage system (BESS) for a utility scale photovoltaic (PV) power plant is proposed. PV systems suffer from intermittency and partial shading problems, which could lead to power fluctuations and reduce grid stability. Utilities' inability to service the contracted load might lead to hefty penalties by the regulators. To reduce the effects of intermittency on PV output, a utility scale...
Photovoltaic (PV) installations on the residential scale have been increasing tremendously and projected to continue to do so. Battery energy storage at the residential level has also become critical due to the increased adoption of residential scale PV. This paper proposes a new micro-inverter topology with integrated energy storage for PV applications. The proposed topology has a structure similar...
This paper discusses a novel multilevel inverter topology. Using only six power devices and two asymmetrical DC sources, the proposed topology is capable of synthesizing seven-level output voltage waveform. As will be seen, the proposed configuration uses the least number of power devices and DC sources as compared to the conventional topologies reported in the literature. Simulation results verifying...
Modern substation integrated systems trend to increase the level of power system automation and remote accesibility, to deliver information to a wide range of users in near real time and also allow to control number of tasks that streamline operations and perfomance [1]. This drastic increase in sophistication of the automation and hidden interconnections (eg. to the Internet), is exposing the electric...
This paper investigates a unique methodology that converts the conventional dc voltage output of a photovoltaic solar panel to switched quasi-square wave voltages with variable pulse width, which when aggregated realize a superior quality multilevel waveform that can be directly interfaced with the power grid. Termed Solar Panel Companion Inverters, this alternative approach offers advantages of micro-inverters...
In this paper, a novel topology based on center-point-clamped circuit configuration for ac-ac power conversion has been presented. This converter introduces a unique methodology to clamp the voltage to the mid-point of the input transformer thus reducing voltage blocking requirements on the bi-directional switches employed in such direct ac-ac converter. Operating principles as well as dynamic analysis...
Majority of ongoing investigations in the field of power transmission systems are concerned with the use of naturally commutated, thyristor switched circuits such as Static VAr Compensators (SVC) and Thyristor Controlled Series Capacitors (TCSC). The enhanced Power Flow Controller (ePFC) is a distributed version of TCSC topology and is an improvement on Distributed Series Impedance (DSI) circuit....
Series Flexible AC Transmission Systems (FACTS) devices have been employed to increase power transfer capability of transmission networks and to provide direct control of power flow over designated transmission routes. However, high costs and reliability concerns associated with implementing one large FACTS device capable of altering the power flow in a wide transmission network have limited widespread...
This paper presents an adaptive distribution overhead line/underground cable protection and fault locator scheme based on IEC61850. This scheme uses the positive-sequence voltage and current phasors at both ends of a distribution line/cable to determine the location of a fault on the distribution line/cable. Traditional distribution systems use time-current coordination for protection devices. These...
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