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The output voltage range of renewable energy generations such as wind and photovoltaic can be influenced by the parameters of environment at a wide range, which can not satisfy the requirements of system for grid-connected operation. Therefore high-gain voltage inverter is important to integrate the renewable energy into the utility. For high-gain voltage and standard load voltage at low input DC...
In this paper, a new method for reference network considering network topology optimization is proposed. The actual operation mode optimization and the correction control with transmission switching under the contingency situation are taken into account in the proposed method. Based on the forecasted load values of each period in predictive multi-time scale and candidate transmission line schemes...
In modern distributed energy systems (DES), there is a shift in focus from conventional centralized approach to more advanced distributed architecture. Modeling and analysis of these complex systems is more challenging, as multiple energy sources are connected with different loads through power electronics converters. Due to vastly different dynamic characteristics of these converters, it is necessary...
Due to the presence of power electronics interfaced generation, voltage stability is a key design goal for converter control systems, such as in Medium-Voltage DC in naval vessels. In the presence of power electronic converter interfaced loads that can display high-bandwidth constant power load (CPL) behavior, the nonlinearity of the negative incremental resistance can induce instability. This paper...
Multilevel current source converter (MCSC) is an effective way to increase the power rating of conventional current source-fed motor drive, especially its current rating. However, there are still several challenges existing in this configuration, which mainly focus on its modulation and control techniques, and the inherent DC current imbalance issue. In this paper, a model predictive control (MPC)...
Multilevel inverters as the best existing solution for high power/ medium voltage applications have been utilized to incorporate renewable energy sources into electric grid. Solar energy, and fuel-cells as two major sources of power can only provide unidirectional power flow. However, utilizing cascaded H-bridge inverters or other inverters with trinary voltage ratios at the input DC links might cause...
Conventional Hybrid Power Quality Conditioner (HPQC) adopts LC coupling branch and L coupling branch in the back-to-back converters to reduce the converter compensation capacity as well as the DC voltage. However, HPQC could only achieve the minimum compensation capacity under certain special load condition. To maintain the converter compensation capacity at a low level under all load conditions,...
Silicon carbide (SiC) MOSFETs have been widely studied in high frequency applications. The switching performance, however, is limited with the existence of the parasitic elements. One critical issue is the susceptibility of the gate-source voltage to the parasitic elements, rendering the possibility of spurious operation of the SiC MOSFETs. This paper conducts comprehensive investigations on the impact...
The aim of this research is to assist the consumer to control the air conditioning load during the peak season. Demand side response model was applied to manage inside room temperature to keep comfortable for the consumer. A simulation study is illustrated the effect of demand side response model application for air conditioning in residential house in Makassar city. In this research there are three...
This paper proposes the application of advanced modelling and control strategies for a single phase Dual Active Bridge (DAB) based Medium Voltage DC (MVDC) Shipboard Power System (SPS). In these systems the tightly controlled point of load (POL) converters exhibit a constant power load (CPL) behaviour, which has a destabilising effect on the bus voltage. In this work, a Multiple Input Single Output...
Non-inverting Buck Boost converters (NIBB) have been utilized as interfacing converters for energy storage, due to the high steady-state efficiency offered by the asynchronous control. However, classical asynchronous control has inherent poor dynamic performance when the input and output voltages are near. To solve the problem, concept of “dynamic mode switching” is first proposed in this paper. Instead...
The concept of decentralized demand response systems is not new, however descriptions of such systems are usually limited to general ideas and possible system services. In this paper the original modified stochastic Decentralized Active Demand Response (DADR) control algorithm has been presented. Fulfillment of the theoretically assumed properties has been numerically tested in a specially elaborated...
In this paper, we propose a method for identifying the differential mode impedance of a paralleled converter cell. The equivalent Thevenin / Norton circuit method is used for prediction. The predict of ElectroMagnetic Interference (generated by converters connected to the electrical network to identify the sources of noise, impedance and harmonics according to the identification of the contribution...
With the increasing application of photovoltaic, the micro-inverter with interleaved flyback module operating in continuous conduction mode (DCM) and discontinuous conduction mode (DCM)is more popular. However, its difficult to control output current of interleaved flyback micro-inverter because the transfer function has right-half-plane (RHP) zero in CCM and low gain in DCM. To solve this problem,...
Bipolar dc-dc converters, which are widely used in the battery testing equipment, have many advantages such as simple structure, wide range of output voltages and high conversion efficiency. However, the traditional synchronous carrier modulation method leads to a circulating current in the ground wire connected between filtering capacitors and the negative dc input bus. The circulating current results...
In this paper, a cascaded multilevel inverter is implemented for resistive as well as RL load. Working of Cascaded multilevel inverter is studied for various levels of voltages by implementing proper switching. To verify the operation of the proposed inverter, simulation is completed using MATLAB for various levels of outputs such as nine, eleven, fifteen, twenty seven, thirty three and thirty nine...
This paper presents an alternative closed-loop control strategy approach of back to back two-level voltage source converter to regulate the dc link voltage. Both rotor speed of the Permanent Magnet Synchronous Generator (PMSG) side and the DC-link voltage of load side are controlled by a PI controller. Modeling and simulation of the control structure has been carried out using PLECS toolbox on Matlab/Simulink...
Vast peak demand management approaches are being implemented in the residential space, and some of them involve automated switching control strategies. Controlled switching of appliances during peak periods minimizes demand and energy consumption, however this may constrict the consumer's flexibility to utilize desired appliances to fulfil their needs. This article presents the experimental implementation...
Capacitive micromachined ultrasonic transducers (CMUTs) are prone to having low transmit sensitivity. According to large signal CMUT models, this shortcoming can be overcome with higher pulse voltages and optimized bipolar pulse drives [1]. Therefore, a supply-inverted bipolar pulser and a Tx/Rx switch are proposed to drive CMUTs in medical ultrasound imaging applications. These circuits are particularly...
The challenge of integration and control of electric energy posed by microgrid can be addressed by introducing the solid state transformer proposed by the FREEDM center. This research focuses on the voltage regulation issue of SST by adopting dynamic phasor-based modeling and internal model control based nested loop PI control. The main contribution of the paper is use of internal model control design...
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