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Micro-grid can be classified as grid connected or isolated. In isolated micro-grid it acts as a small power system with its all part (generation, transmission, and distribution). The main driver for isolated micro-grid is the availability of local energy resources. Hybrid Renewable energy system (HRES) is a combination of one or more renewable resources such as solar Photo Voltaic (PV) and wind turbine...
Original last breaker protection based on arrester energy consumption characteristics might malfunction in light loaded power system. In this paper, we analyzes the relationship between the high side inlet voltage of converter transformer and the AC load, pointing out that the main reason of the arrester based last breaker protection maloperation is that the original protection strategy cannot distinguish...
As large-scaled electric vehicles (EVs) connecting to power distribution system via charging devices, the load of power system will get heaver in the foreseeable future. This will lead to an increasing risk for the security and stability of operation. Studying the quantitative influence that EV charging loads bring to the transient voltage stability of distribution system is of vital significance...
Electric vehicles connected directly to the distribution network are expected to increase the base electric loads and reduce the stability of a power system. Meanwhile, equipped with bidirectional battery chargers, electric vehicles can work in V2G mode, as spinning reserve, and enhance grid stability. This paper discusses the charger technologies, requirements and proposes transient voltage stability...
The relation among DC bias, zero-crossing shifting resulting from voltage distortion and commutation failure is analyzed in this paper. It is pointed out that magnetizing current of converter transformer distorts when DC biasing, which not only may cause distortion of AC bus voltage, but increase risk of commutation failure. Based on PSCAD / EMTDC simulation software, China Southern Power Grid AC-DC...
The occurrence of DC Bias will affect the normal operation of power transformer, thus DC bias withstand capability of transformer is a prerequisite for stable operation of power system. In this paper, the DC current distribution model of transformer neutral point in Yichang area is established. Meanwhile, according to the transformer noise limit, the maximum current which is allowable to flow through...
Since busbar protection is the cornerstone of smart grid stability, a wireless sensor network (WSN) of distribution busbar protection is presented, and architecture of the WSN and busbar protection principles are proposed in this paper. The fault detection, analysis and judgment of WSN protection owns a unique feature but still has common characteristics with traditional protection scheme. Based on...
Although single phase to ground fault location in non-solid grounded networks has been studied for many years and a lot of research has been done, yet adequate solution for direct fault location of radial distribution network hasn't been made, especially for the distribution network with the neutral point grounded via arc suppression coil. Involvement of the arc suppression coil may decrease short-circuit...
The selection of the faulty feeder in the case of single phase-to-earth fault in a Neutral Un-effectively Grounded System (NUGS) has been one of the conventional problems of distribution network. The compensation method is introduced to highlight the difference of the zero-sequence admittances between the faulted feeder and the sound feeder. In this way, the setting of the criterion becomes feasible...
A novel single-ended traveling wave fault location method applicable to the distribution network with multiple branches is presented in this paper. The method only depends on the arrival times of the initial aerial-mode and zero-mode travelling wave, and it is not affected by structure of a distribution system itself. Therefore, good results can be achieved for precise fault locating in multi-source...
As a result of world's energy resources crisis and environment pollution increasingly aggravating, distributed generation (DG) based on renewable energy has become a developmental trend for electric power industry in 21 century. However, DG's are usually affected by natural conditions being not able to output power continuously and steadily, so when large scale wind turbine generators are incorporated...
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