2012 IEEE International Conference on Power System Technology (POWERCON)

This paper discusses the results of experiments performed to analyze the effects of multiple compact fluorescent lamp usage on residential power quality. CFLs are quickly replacing incandescent lamps in home lighting but their effects as non-linear loads on residential power quality is unknown. We performed 15 sets of experiments with different CFLs and analyzed their harmonic interactions. The re... View full abstract»

The modelling and control of proton exchange membrane fuel cell (PEMFC) possesses great challenges due to PEMFC system's inherent nonlinearities, time-varying characteristics and tight operating constraints. In this paper, we propose a constrained model predictive control (MPC) strategy based on a combined empirical and mechanistic model of PEMFC. First, we propose a hybrid modelling approach base... View full abstract»

The increase in demand for electricity and the growing energy density in the metropolitan areas have made it necessary to extend the high voltage network right up to the consumer. Gas insulated substations provide a best solution to the above problem and have been functioning for more than 30 years around the world. SF6 gas used in GIS has excellent dielectric properties, current interruption prop... View full abstract»

Today in competitive power markets, with higher level of penetration of variable renewable energy resources, electric energy price becomes more volatile and uncertain. The integration of distributed generation into the distribution systems makes the load more volatile. It becomes more challenging for load aggregators to manage energy purchasing cost facing the higher price and load uncertainties. ... View full abstract»

With the fast development of wind power, the techniques related to its grid integration and control have been researched all over the world. In which, active power control of wind farm is one of the most important techniques. However, current methods are not good to satisfy the relevant requirements. For the problem, an optimal active power control method of wind farm using the information of ultr... View full abstract»

In response to the severe energy and environmental issues, CO₂ emission reduction and low-carbon development are inevitable. China has become the biggest CO₂ emitter in the world since 2006. As a major CO₂ emission source in China, power industry is facing greater pressure for carbon emission abatement. By applying various low-ca... View full abstract»

Loads and distributed generation production can be modeled as random variables. This paper shows that the proposed method can be applied for the keeping of voltages within desired limits at all load buses of a distribution system with small-scale biomass based energy systems. To measure the performance of this distribution system, this work has formulated a probabilistic model that considers the r... View full abstract»

Electricity providers are increasingly faced with the challenge to integrate variable renewable generation with the existing portfolio and the electricity grid. The UltraBattery®technology, an entire new class of advanced lead-acid batteries invented by the CSIRO, now allows the continuous management of variability and shifting of energy, crucial for the large scale integration of renew... View full abstract»

This paper presents a multi-objective model considering flow time for cascaded hydro optimal scheduling. This model concentrates on taking advantage of the peaking regulation and generation for hydro units with two objectives introduced. One of them is minimization of total surplus load, which is surplus system load deducting the generation of hydroelectric generating units; aiming at maximizing t... View full abstract»

When electrical transients take place in onsite power system of nuclear power plants, the voltage of safety bus can be affected, as a form of voltage sag, by the transients. The safety buses in nuclear power plants have a role of power supplying to essential loads for safety shutdown of reactor. If voltage sag of the safety bus occurs and impact on the safety features is existed, the risk of nucle... View full abstract»

In this paper, a modified particle swarm optimization (MPSO) is introduced and applied for simultaneous coordinated designing of the power system stabilizer (PSS) and unified power flow controller (UPFC) as a damping controller in the multi-machine power system. The coordinated design problem of PSS and UPFC controllers over a wide range of loading conditions is formulated as a multi-objective opt... View full abstract»

Load shedding is the only Demand Side Management program taken by the utilities to reduce the peak load of the power system suffering from the capacity shortage in China. Three main contributions to improve the current load shedding program are elaborated in the paper: (1) The yardstick competition theory is innovatively applied in the load shedding for industrial consumers, which will lead to a s... View full abstract»

This paper proposes a decoupled three-phase load flow analysis method for unbalanced distribution systems. The power flows are solved through nodal current injection mismatch equations written in rectangular coordinates. The voltage changes resulting from nodal current injection mismatches and nodal admittance matrix have been decoupled into one contribution from the real part, conductance matrix,... View full abstract»

Rapid increase of wind power installation in China brings new technical issues and challenges for grid security operation. Reactive power and voltage control capability of wind farms is one of key issues that grid operators concern with. This paper presents a coordinated reactive power and voltage control system for wind farm gird integration to meet operation requirements described in the standar... View full abstract»

Large-scale development of plug-in hybrid electric vehicles (PHEVs) will have the most direct impacts on the distribution grid. PHEV charging impacts to the distribution grid are analyzed through a residential feeder of 10kV in a city from aspects such as load profile, power loss, voltage quality, and several penetration level scenarios are discussed. The results indicate that uncontrolled chargin... View full abstract»

Investigations of the electromagnetic interference indicate that disconnecting switching of the off-loaded busbars is one of the most important sources of electromagnetic interference in the secondary circuits of a power station. Disconnector's contacts in air-insulated substations (AIS) move slowly causing numerous strikes and restrikes between contacts. Every strike causes high-frequency current... View full abstract»

The work in this paper researches directional flow of power at harmonic frequencies in an integrated HVAC/HVDC power system. An innovation is the introduction of the concepts sources and sinks to demonstrate directions. A nodal diagram and new formulae are developed for analysing harmonic source-sink relationships of real and reactive power directional flows. Harmonic penetration is investigated t... View full abstract»

Selection of appropriate size of capacitance is very important to buildup voltage in a self-excited induction generator (SEIG). This paper proposes a simple method of determining the actual size of capacitance needed in a three-phase SEIG to obtain a pre-specified voltage under no-load and load conditions. The problem of determining the capacitance is formulated in a very general way so that the s... View full abstract»

A kind of main/auxiliary type wide-area backup protection fault location algorithm is proposed to improve the performance of the protection system. The “main” is through strict mathematical calculation to accurately locate the fault location, and the “auxiliary” is using the basic knowledge of power system to predict the fault interval. The “main” and the “auxiliary” run simultaneously. The interv... View full abstract»

A Transient Stability Analysis & Control (TSA&C) system has been developed and installed at PJM Interconnection several years ago, to perform on-line Dynamic Security Assessment (DSA) for the PJM power system. TSA&C was successfully applied to investigate an event that took place recently in the PJM system. This paper presents this application example to illustrate value and benefit of... View full abstract»

In this paper, the novel approach to design the power system stabilizer using artificial neural network based Non Linear Auto Regressive Moving Average-L2 (NARMA-L2) controller has been presented. The controller has been used to generate the appropriate supplementary control signal for the excitation system of synchronous generator. The signal generated has been used to damp the low frequency osci... View full abstract»

Large-scale integration of wind into power grids can have significant impact on the system stability. This paper presents the Rate Of Change Of Frequency (RoCoF) metric to determine limitations of the system with high levels of wind penetration. The metric takes into account the system inertia, wind turbine response, and the size of contingencies. The metric is then applied to the Tasmanian power ... View full abstract»