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This paper presents the experimental results on electromagnetic behavior of galinstan in liquid metal current limiter in case of rated and short circuit current respectively. For the former, the liquid keeps unstable in the channel like ‘boiling’ when DC current of 1kA passes it and pinches to ignite the arc finally within the channel in several minutes, which is observed by a specially designed test...
In this paper, the concept of micro energy internet is discussed firstly. To achieve economic and environmental goal in the operation of micro energy internet, a hierarchical energy management system is proposed to handle the power flow exchanged between the micro energy internet and the host grid. First, the concept, characteristics and operational goals of micro energy internet is investigated....
In this paper, an improved high-frequency equivalent circuit model is developed to represent the joint high-frequency behavior for the time and frequency-domain analyses. The model is based on improved high-order multiple-Γ sections. Considering the shape variation in axial direction, the cable joint can be approximated as series-connected uniform line pieces, each of which can be equivalent as several...
The nonlinear distortion from power amplifier (PA) distorts the signal and causes significant impact on the symbol-error-rate (SER) performance for the electric-power-systems (EPS) communications. This paper proposes a calculation of the optimal input power back-off (IBO) to resist PA nonlinearity, as well as guarantee an appropriate signal-to-noise ratio (SNR), by minimizing the mean square error...
In ultra-wideband (UWB) communications for power electronic systems, large power consumption and logic resource are occupied by multi-parallel sliding-block Viterbi decoders. A novel add-select-delay-compare architecture for Viterbi decoder is proposed to minimize these consumptions. In this architecture, a nested iteration of add-select and compare-select with balanced settling path is utilized to...
The EMT simulation for wind farms provides an alternative approach to study interaction between wind farms and power systems. To build up an EMT model of the DFIG, thoroughly considerations should be paid to the characteristics of the back-to-back PWM converter, which plays a crucial role in determining the dynamic behaviors of the DFIG. However, the detailed models of the PWM converters are so complicated...
Due to the randomness and intermittent characteristics of wind energy, the integration of wind farm may have many negative effects on the operation of the distribution networks. In this paper, a scenario-based evaluation framework is established for the theoretically analysis of influences introduced by the uncertainties of wind power integration. Then, a set of well designed evaluation indexes are...
Transient simulation of wind farms provides an effective approach to study dynamic performance of power system with high penetration of wind power. To accelerate the transient simulations, sophisticated modeling methods for the DFIGs are required. In this paper, a general framework is proposed to develop and verify the fast simulation models of the DFIGs, which is based on practical indices designed...
Power system economic dispatch with renewable energies like wind power is a typical decision-making problem with uncertainty. Firstly, a robust decision-making model for this type of decision-making problem is formulated in this paper based on the two-person zero sum game, and the detailed robust economic dispatch model for the power system with wind power and plug-in electric vehicles (PEV) is proposed...
In order to obtain partial discharge (PD) measurements under impulse voltage, a PD measuring probe based on a current transducer was constructed. In this paper, the transfer function of the current transducer was proposed, and bode plot simulated the effect of changing some of variables, then by selecting magnetic cores and optimizing chief parameters, a PD measuring probe has both wide bandwidth...
Due to the lack of typical damage samples in the transformer fault diagnosis, a new method based on chaos support vector machines (CSVMs) was proposed. According to the method, the five characteristic gases dissolved in transformer oil were extracted by the K-means clustering (KMC) method as feature vectors, which were input to chaotic optimal multi-classified SVMs for training. Then the CSVMs diagnosis...
Partial discharge is defined by IEEE as an electrical discharge that only partially bridges the insulation between conductors and that may or may not occur adjacent to a conductor. Partial discharges occur when the local electrical field intensity exceeds the dielectric strength of the dielectric involved, resulting in localized ionization and breakdown. Therefore, measurement and analysis of this...
In order to study partial discharge pulses under impulse voltage effectively, a high-frequency current transducer for measurement of PD is developed. According to the equivalent circuit model, its principle and transmission characteristics are analyzed, and the effects of coil turns integral resistance and stray capacitance on frequency properties are studied. Moreover, calibration and analysis of...
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