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In the last decade, harmonic analysis of Japanese middle voltage (MV) customer and low voltage (LV) customer has been done, the distribution of the fifth harmonic current can be classified MV customer's single phase load, LV customer's three phase and single phase load named group A and MV three phase load named group B, and the amplitude per load kW has been investigated from sum of each current...
We developed a constrained state estimation method that clarifies the range of the feeder voltage in an unobservable distribution network in which the number of telemetric sensors is smaller than the number of state variables to be estimated. Instead of using pseudo-measurements, whose reliability is affected by unexpected power flow conditions, the method uses constant nominal boundaries as inequality...
A regime shift occurs when a dynamical system's state shifts from a nominal equilibrium to an alternative equilibrium. This concept is often used to describe the collapse of ecological systems, but it also appears in many engineering systems; most notably in the voltage collapse of power systems. This paper uses an information theoretic index known as the Fisher Information (FI) as a real-time statistical...
Transmission line parameter modeling and PMU measurement calibration are important research topics in power system engineering. State estimation is widely used to estimate voltage with assumption of “accurate” system parameters. Various methods have also been proposed to estimate line parameters based on PMU measurements. However, neither system parameters nor system measurements are reliable enough...
This paper proposes a Support Vector Machine (SVM) based methodology to classify the loads into various classes based on the load responses, following a disturbance and other information available from the feeder. The classification is performed after a large disturbance, and the model parameters are estimated by using a variable projection based efficient optimization algorithm. For small disturbances...
This paper proposes a robust control scheme to improve the integration of variable energy sources such as renewables into a DC bus distribution microgrid. The model of the controller is developed and analyzed with simplification of parameters and keeping the effect of the multiple loads and sources connected in parallel as an uncertainty. Various simulated scenarios are used to show the performance...
The changing face of the electric power system due to new power apparatus, the proliferation of customer owned resources and smart devices creates the possibility of coordinated control of all these resources for the benefit of the power grid and its customers. Coordinated control requires real-time monitoring of models and resources and subsequent model-based analysis, optimization and control. Legacy...
This paper presents a digital implementation of a DSP-based digital IEC 61000-4-15 flickermeter. According to the functions and design criteria suggested by IEC, a digital model of the flickermeter is developed and simulated by using Matlab and Code Composer Studio. Then, the developed flickermeter function is applied to perform a series of tests based on IEC Standard 61000-4-15 test procedures to...
This paper presents a new approach to voltage estimation for N−1 contingency analysis. The voltage magnitude after a single line or generator outage is estimated using a voltage sensitivity matrix. The sensitivity matrix is derived using phasor measurements during normal operation. This technique is compared to the traditional voltage sensitivity calculation using the Jacobian of the system, which...
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