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The integration of distributed energy resources into low and medium voltage networks will have profound impact on distribution network reconfiguration. In this paper, the impact of DG on distribution network reconfiguration is analyzed in both normal operation and post-fault scenarios with different load levels. Distribution system simulation is performed with the Open Distribution Simulator Software...
To improve the dynamic performance of the dual PWM converter, a new control strategy named direct capacitor power control based on sliding mode variable structure (SMC-DCPC) was proposed. In order to control the capacitor power and the grid-side reactive power to be zero, two sliding mode controllers were designed in the inner power loop. To realize the decoupling of grid-side active power, load power...
A complete secondary system can be split concerning the engineering responsibility into different parts. Example is separate engineering of line operation interlocking between substations. This paper presents a new approach to line operation IEDs engineering with exchanged information between substations, which is compatible with IEC 61850. In this paper, Architecture of Line Operation between substations...
The simulation accuracy of models is the basic of power system analysis, calculation, protection and control and verification of algorithm. And the present evaluation methods can not satisfy requires of analysis. The amplitude, frequency, phase and attenuation factor of the main resonant component are used for evaluation index in this paper. Combined with the evaluation index, prony algorithm is used...
In this paper, a particle swarm optimization (PSO) based negotiation agent with learning capability is proposed to facilitate the bi-directional energy trading between the building and the utility grid. A comprehensive set of factors in the integrated smart building and utility grid system is taken into account in developing the negotiation model. In addition, the learning capability of the negotiation...
Large-scale renewable energy source integration brings a significant challenge to the dispatch of power network. The potential synergy among the electrical vehicle charging, wind power and photovoltaic power has provided a workable approach for power grid to accommodate more renewable energy sources. By optimization of charging plan of electrical vehicle charging station of area grid under the premise...
Coordination method between long-term and short-time generation scheduling of wind power integrated system are proposed. Long-term scheduling mainly solves unit maintenance scheduling and energy allocation among weeks, and short-term scheduling decides unit commitment and hourly power output. In order to cope with the high uncertainty of wind power and load demand, dynamic rolling generation scheduling...
In this paper, a new three to single phase cycloconverter based on Ĉuk topology is proposed. The circuit will provide the load with adjustable AC voltage and frequency having low input current distortion, high input power factor and maintain high power conversion efficiency. In case of conventional cycloconverters, input power factor is low and input current is distorted. Complex control circuitry...
Distributed Generations (DG) have a great impact on the traditional distribution system. The increasing and wide use of DGs seems to be an edged sword, which has both positive and negative effects. From the perspective of power grid structure and distributed energy resource operation characteristics, this paper analyzed the different factors that influence the power supply reliability, such as the...
This paper presents a strategy of online adaptive underfrequency load shedding with wide area measurement (WAM) of nodal market power assessment (NMPA) to minimize the inter-area power requirements by shedding load near to the source of generation-load imbalance in a deregulated power system connected to distributed generation (DG). Simplified frequency response model is used to estimate the frequency...
The power condition system based on converter parallel for large capacity battery energy storage is introduced in this paper. For dispatchable battery energy storage system, the problems of power condition system with PQ control under unbalanced grid are emphasized. A new control scheme concerning both grid-connected current quality and circulating current elimination is proposed for power condition...
Partial discharge (PD) measurement is a promising method for condition assessment of insulation systems in smart grid. Conventional PD measuring systems have some difficulties in the measurements especially under on-line and noisy conditions. There is a growing tendency to use new measuring systems for the detection of PD pulses in 10kV switchgears. In this paper, a new PD detection method based on...
The micro-grid technology that integrates distributed generations, energy storage element and loads is an effective approach to solve the interconnection of large-scale distributed generations with power grid. Wind and solar can be complementary to each other in time, therefore wind and PV hybrid power system could make full use of clean energy and have high reliability. Smooth switching between grid-connected...
Different from conventional generators, wind power is an intermittent energy source, power system dispatch and control is confronted with new challenges. This paper establish the mathematical model of wind power and energy storage system for simulation and analysis, and study the wind power prediction using statistical methods and physical methods, and study the key technologies of automatic generation...
Micro-grid is a new concept gained significant attentions due to the increasing distributed energy sources. Several micro-grid test beds in the forms of either hardware or software simulation have been developed around the world. In Taiwan, one 20KVA 3W3Ø micro-grid test bed has been conducted in National Tsing Hua University (NTHU). This micro-grid consists of various fundamental power system components,...
In China, wind power industry has undergone great development in the last few years, while several cascading faults happened in 2011, reveal that terminal voltage of wind turbine generator (WTG) should be monitored and controlled. Furthermore WTGs and static var compensators/generators (SVC/SVGs) need to be coordinated to provide voltage service for the whole network. In this paper, a network model...
How to determine location and scale of electric vehicle charging station is a new problem for many researchers. A comprehensive objective function considering geographic information, construction cost and running cost is built in this paper. In objective function, construction cost consists of land cost, and investment in distribution transformer. Running cost includes power supply losses and with...
Smart meters and related technologies are becoming a noteworthy aspect of residential electrical power systems as proper energy feedback can result in significant energy savings. Smart meters also facilitate implementation of “time of use” (TOU) pricing for the residential sector. Results of Advanced Meter Infrastructure (AMI) pilot studies reveal that it is possible to save 12–15 % of energy saving...
Nowadays, the development of electric vehicles (EVs) is encouraged in China to address the issues about the energy security and the environment. In this study, the impacts of some crucial factors on the total charging load are investigated, such as the charging rate of the charging infrastructures, the battery capacity, the preference of the charging behavior and the penetration level of the charging...
The voltage source converters (VSCs) are widely preferred topologies for grid connection of renewable energy systems. This paper aims to evaluate the various types of deadbeat (DB) current controllers for the VSCs, which offer fast and finite settling time. The type of DB current controllers discussed in this paper aims to achieve the current command in one and two sampling time delay. Two compensation...
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