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We propose a new Non-Intrusive Load Monitoring (NILM) approach for appliances power profile/signal estimation at low sampling rate (1 s or greater). The proposed method relay on two main phases: identification of turned on appliance combination in a given time period and estimation of the active power consumption signal of each individual appliances in that combination. Unlike most existing NILM method...
With the increasing levels of distributed generation, the control of voltages within statutory limits across distribution networks becomes challenging. Further, the demand depends on the load busbar voltages to some extent and therefore the voltage control becomes an important means of load control especially at peak load periods. An electronically controlled series compensator based on a three winding...
A Non-Intrusive Load Monitoring (NILM) method for residential appliances based on uncorrelated spectral components of an active power signal is presented. This method utilizes the Karhunen Loéve (KL) expansion to breakdown the active power signal into subspace components so as to construct a unique information rich appliance signature. Unlike existing NILM techniques that rely on multiple measurements...
With the ever increasing demand for electric power, electricity suppliers face the challenge of transmitting and distributing more and more power to load centers. However, the power distribution is limited by the ratings of power lines. Construction of new lines may solve this problem but it is not economically and socially preferred option. The limit of the maximum current a line can transmit is...
Smart Grid is expected to improve the reliability and efficiency while reducing the carbon footprint of energy sector. The incorporation of renewable generations at customer premises is a viable method to increase the renewable component of generation in Smart Grid. However, the random and intermittent nature of power generation is an inherent challenge for the operation of power grids with high penetration...
It is anticipated that with increased penetration of micro scale renewable generation sources, electric vehicles and demand response initiatives the voltage of low voltage networks need to be controlled in real time. Commonly used method of voltage control is on-load tap changing. However as this has limitations, an electronically controlled Volt-Var Control (VVC) scheme based on a three winding transformer...
This paper presents a subspace signature based approach for the identification of turned on appliances at a given observation time using one single-function smart meter. The novelty of the proposed approach compared to existing method is its capability for proper identification while relying on a significantly lower amount of measurement data. Unlike existing techniques which rely on multiple measurements...
Frequency excursions on electrical power systems are traditionally controlled using governors on central, often steam driven, generators. However, if the proportion of steam driven plant is reduced, there is a need to provide frequency response by other means. Distributed frequency response is under-utilised; this is partly because it is difficult for system operators to schedule demand side frequency...
The potential of Fully Rated Converter-based wind turbines (FRC-WTs) on the mitigation of subsynchronous resonances (SSR) in the power system having series-compensated transmission line. IEEE First Benchmark Model (FBM) was featured with Aggregated FRC-WTs to perform the studies. The potential occurrence and mitigation of the SSR in steam turbine were investigated. The Linear Quadratic Regulator (LQR)...
High penetration of wind power is hindered by the variability and uncontrollability of wind power output. Many research publications already proposed solutions using energy storage devices. However due to capital and maintenance cost, real applications of energy storage are limited. Wind turbines employing wound rotor induction generators where either rotor resistance is controlled or a voltage is...
In Great Britain, increased wind generation, up to 34 GW, is planned. Offshore and onshore infrastructure reinforcements have been proposed, the inland reinforcement including series compensation (fixed capacitors), as discussed in the UK National Grid 2020 Vision. Interaction of series fixed capacitors with the quadrature boosters that are already installed in the GB transmission grid is assessed,...
The complete-order modelling of state-space representations of synchronous and induction generators for wind turbine applications is presented. Fully equivalent models with different state variables, suitable for different control schemes, are given. The state-space representations provide a convenient, compact and elegant way to assess the induction and synchronous generator-based wind turbines,...
The combination of extensive cable networks and wind turbine converters has been identified as a potential cause of resonances. A modelling approach for a doubly fed induction generator and a full power converter fed generator for harmonic penetration studies is developed and discussed. An example offshore wind farm is then studied in the simulation package IPSA using the detailed wind turbine generator...
The electromechanical transients during a deloading of a DFIG turbine and the Fault Ride Through (FRT) capability of a DFIG wind farm connected through HVDC transmission lines are discussed. The electromechanical oscillations during a deloading operation of a DFIG wind turbine generator are simulated using BLADED software. Then power reduction control during a fault was achieved by reducing the power...
The limitations with regard to the capability of Doubly Fed Induction Generator based wind turbines are discussed. The importance of considering the stability margin when constructing the capability curve was highlighted. Then the total power output vs the reactive power output of the turbine within its capabilities was obtained. A case study was carried out to discuss the capability of a wind farm...
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