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This paper presents different types of robust state estimators and introduces original formulations that allow solutions to be obtained using general-purpose mathematical programming algorithms. Different set up of bad measurements and bad leverage measurements are introduced to evaluate the performance of these estimators. Independent and confirming bad measurements are considered. The performance...
The major issues always attached to conventional electrical Distribution Systems are poor voltage regulation so far the consumers are concerned and the high level of losses & limited or no reserve capacity of the Network so far as the utility is concerned. In this paper, an attempt has been made to address both issues by adding Dispersed Generation of appropriate capacity at appropriate location,...
This paper focuses on the study of the paralleled multi-terminal HVDC system (MTDC). A control strategy is investigated for LCC-MTDC system based on the autonomous decentralized theory. By this approach, a stable operating point can be reached from initial starting independent of communication coordination. Simulation is performed on a model of LCC-MTDC system with four terminals using PSCAD/EMTDC...
In the context of Condition Based Maintenance (CBM), this paper presents a risk-based optimization model for system maintenance scheduling problem. It consists on optimizing availability and cost of the system by balancing between system maintenance risk and failure risk. In this paper, system reliability constraint is considered. Reliability of system components is characterized by their failure...
Short term load forecasting methods involve estimation of the model parameters. The estimation is done by using the historical data of load profiles. Therefore quality of the data is very crucial for the better estimation of the model parameters. In practice, many events occur which degrade the quality of data. These events include natural and man-made calamities, network outages, trade strikes, general...
It is important to manage precise power flows in closed small power networks for their reliable operations. This paper describes a method for managing the instantaneous power flows in a local area power network. In order to provide instantaneous power to a load through a power bus without disturbing the other modules, we adaptively adjust the power flow and keep the balance of the instantaneous power...
In this paper, a grid connected permanent magnet synchronous generator (PMSG) based direct drive variable speed wind turbine with a static synchronous compensator (STATCOM) is investigated to achieve uninterrupted operation of wind farms during grid disturbances. The wind energy system will be able to maintain uninterrupted operation during grid faults or disturbances. The control strategies for the...
This paper proposes a new method to measure AC frequency and amplitude by combining group theory and spiral vector theory. At first, the real frequency of power system is defined associated with a rotation phase angle in the complex plane. Then with the rotation phase angle and three voltage vectors, a gauge voltage group is constructed. Therefore the group's two invariants - frequency coefficient...
Solar photovoltaic electricity is more expensive by a large margin compared with conventional electricity at retail level. As a result, general public do not find the solar PV electricity an attractive option to use for generating a portion of their electricity need. To promote PV electricity utilization and to make it more attractive, Governments of some countries like Germany, Japan, USA, Australia,...
Conventional monitoring systems do not address the increasing complexity of electric power systems (EPSs). Bringing together the strengths of artificial intelligence technologies, special software and Wide Area Monitoring System/Phasor measurement unit (WAMS/(PMU) technologies it provides a holistic, intelligent approach to the monitoring of complex EPSs for the detection of emerging patterns. This...
In the area of power quality conditioners, the Series Hybrid Active Power Filter (SHAPF) has been focused more because of its multi-functionality and lower inverter rating requirement. Existing control strategies for SHAPF are based on extracting either source current harmonics or load voltage harmonics and are valid for balanced source and load conditions. In this paper, a novel control scheme based...
This paper presented an investigation of diversity factors for Light Emitting Diode Lamps (LEDs) which are used in residential and commercial applications as energy efficient lighting bulbs. It is done by performing experimental tests on various LED lamps available in the market. The current drawn by several LED lamps are first measured to investigate the electrical characteristics. These measurements...
This paper presents the reliability analysis of a distribution test system comparing four different load models using the time sequential Monte Carlo Simulation techniques. The load models investigated include: an average load, a time varying load, a five-step load and a beta probabilistic load model. The accuracy of representation of the actual customer load varies with different load models. The...
In this research, the novel hysteresis current controller in dq reference frame is proposed to replace the traditional Proportional-Integral (PI) regulator in the vector control scheme of Doubly Fed Induction Generator (DFIG). More dominant than conventional hysteresis current controller, this algorithm can modulate the voltage space vector directly in the dq rotation frame. Therefore, it is simple...
The introduction of ‘Smart grid’ technologies in the electricity supply industry has attracted new attention to Conservation Voltage Reduction (CVR). CVR is a method that aims to save energy by reducing the voltage level of the electrical distribution network. However, not all devices consume less electricity when exposed to lower voltage levels; some devices keep energy consumption constant by extending...
Repugnancies often appear between control behaviors of the real time optimal dispatch and the reserve regulations (containing primary, secondary and tertiary regulations). Real time optimal dispatch push the power system operating point toward the optimal point, but reserve regulations pull it deviated from the optimal point, it induces that the most operating points become non-optimal points. With...
Precise estimation of synchronized phasors in phasor measurement unit (PMU) is significant for system analysis, control and security. Measurement technique under dynamic conditions is addressed in recent researches. Limitations and criteria for dynamic behaviors are proposed in the new issued IEEE Std. C 37.118-2011 for synchrophasor measurements for power system. In this paper, dynamic characteristics...
As installed capacity of wind power retains a significant proportion of generation in the power system, the dispatch of wind power brings some new problems to the system. It is an effective way to increase the capabilities of wind farms to regulate active power for grid optimal dispatch support. Particle swarm algorithm is an excellent optimization algorithm for its robustness and versatility, and...
In 1926 Carson produced his paper on ground return effects for overhead wires. It is surmised that the intended application of this work was telegraph circuits. The equations, however, have since been applied to transmission networks ranging from printed circuit boards to power systems. Carson in his derivation makes many assumptions, most of which are only alluded to. This makes defining the boundary...
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