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This paper presents the implementation of a hardware-in-the-loop simulation (HIL) workbench for hybrid AC/DC micro grid. The hybrid AC/DC micro grid integrates both distributed sources and loads in AC/DC systems to respective links directly. For DC system, photovoltaic arrays with boost converter (PVBC), battery with bi-directional DC/DC converter and DC loads are covered. Diesel generator (DGs) and...
Comparing to the traditional generator, wind turbines have special short circuit current traits, which gives rise to many new problems in power system's protection control. Traditional protection methods can't meet the requirement of the safe operation of the power system. This paper firstly analyzes the double feed induction generator. Then for the typical wind farms, the effect of the collective...
Several cases of unusual mal-operation of the current differential protection for transformer, generator and transmission line already in service, due to the adjacent transformer switching-on, have been reported. The complex inrush current, including the magnetizing inrush current and the sympathetic inrush current, is considered to be relevant with this sort of mal-operation. However, the detail...
The performance of the power take-off (PTO) system for a wave energy converter (WEC) depends largely on its control algorithm. This paper presents an adaptive damping control algorithm which improves power capture across a range of sea states. The comparison between this control algorithm and other active control approaches such as linear damping is presented. Short term wave elevation forecasting...
A stator earth fault protection scheme based on fault current is presented in this paper. It trips out the faulted generator only if the fault current following the breakdown channel exceeds the tolerance capacity of the generator. Otherwise, it will just emit alarm signals. This protection scheme can avoid unnecessary trip-out of large generator, which influences the safe operation of power system,...
As the probabilistic load flow (PLF) approach is often applied in the assessment the voltage in the distribution system with the distributed generation, the intermittent power output of the distributed generators (DGs) should be more considered. The power variation characteristics of load and distributed generators should be treated separately. In this paper, taking the PV arrays for the typical example,...
Wind power gradually occupies important proportion in modern power grid. The influence of wind turbine generator (WTG) for protective relays has been studied in recent years, but a very few papers are presented to study relative influence to primary protection. This paper proposes a detailed analysis for the operating characteristic of transmission line primary protection in power network which are...
The issue of power quality in the distribution system is always in sense of the concern. With the high penetration of distributed generation (DG) currently, it tends to be more complicated. This paper presents a new approach to evaluate impacts of the DG on power quality of the distribution network. In the process an objective function will be modeled, which will be solved by the optimization toolbox,...
Microgrid technologies are highly developed in low voltage networks, improving the power supply reliability and energy efficiency. Therefore, in this paper, the concept, including the configuration, principle and operation of microgrid, will be specified, comparing the microgrid with the prior distributed generation. Additionally, in order to justify the feasibility, the economical benefit analysis...
This paper designs a SRD-based comb generator with coplanar waveguide input and slot line output, for the use of phase reference and calibrator of mixer-based NVNAs. With a calibrated sampling oscilloscope, the precise characterization procedure of this comb generator is presented. The magnitude and phase repeatability of this comb generator is given through repetitive measurements, along with their...
Different stator winding types of multi-branch generator lead to different internal short circuit fault aggregation, and the main protection scheme research must base on this fault aggregation to educe the optimized branch grouping style on neutral side and the main protection configuration principles. The paper analyzed the stator winding type and internal short circuit faults of 250 MW generator...
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