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The increasing penetration of large-scale wind generation in power systems will challenge the power system inertia due to the reason that the converter based variable speed wind turbines have no contribution to the system inertia. Traditionally, a doubly fed induction generator (DFIG)-based wind power plant naturally does not provide frequency response because of the decoupling between the output...
This paper presents a smart energy management strategy (SEMS) to optimise the economic operation of a micro-grid. As an important component of smart grids, the micro-grid acts as a bridge to bundle renewable generation, energy storage systems (ESSs) and electric vehicles (EVs) together. It can be operated either by connecting to upstream distribution systems or isolated with the help of ESSs. In the...
This paper introduces a localized phase compensation method for the design of power system stabilizers (PSSs) to suppress the oscillation occurred in a single-machine infinite-bus (SMIB) power system. The proposed method is used to design stabilizers to suppress power system oscillations and only requires the available generator and transformer parameters thus eliminating the need to receive and verify...
Renewable energy resources are increasingly being used to meet electric power demands and are gradually replacing conventional generation. In particular, wind generation using variable speed wind turbines (VSWT) which include doubly-fed induction generator (DFIG) technology, can not only be adjusted by the amplitude and phase of rotor excitation current but also by active and reactive power independently...
This paper considers the coordinated tuning of stabilisers attached to the primary control loop of a Synchronous Generator (SG), Doubly Fed Induction Generator (DFIG) and Energy Storage System (ESS) in a large-scale electric power grid. The indices obtained from a Damping Torque Analysis (DTA) method are used to evaluate the impact of different stabilisers subject to a range of low-frequency oscillations...
The increased interconnectivity and complexity of supervisory control and data acquisition (SCADA) systems in power system networks has exposed the systems to a multitude of potential vulnerabilities. In this paper, we present a novel approach for a next-generation SCADA-specific intrusion detection system (IDS). The proposed system analyzes multiple attributes in order to provide a comprehensive...
Increased complexity and interconnectivity of Supervisory Control and Data Acquisition (SCADA) systems in Smart Grids potentially means greater susceptibility to malicious attackers. SCADA systems with legacy communication infrastructure have inherent cyber-security vulnerabilities as these systems were originally designed with little consideration of cyber threats. In order to improve cyber-security...
Synchrophasor systems will play a significant role in next generation Smart Grid monitoring, protection and control. However, these systems also introduce a multitude of potential vulnerabilities and cyber threats from malicious attackers or disgruntled employees, which may cause erroneous situational awareness or severe damage. This paper proposes a Synchrophasor Specific Intrusion Detection System...
Environmental concerns and fossil fuel shortage put pressure on both power and transportation systems. Electric vehicles (EVs) are thought to be a good solution to these problems. With EV adoption, energy flow is two way: from grid to vehicle and from vehicle to grid, which is known as vehicle-to-grid (V2G) today. This paper considers electric power systems and provides a review of the impact of V2G...
This paper investigates the use of plug-in parking lots (SmartPark) as integral energy storage to improve small-signal stability using plug-in electric vehicles (PEVs). The paper establishes the Phillips-Heffron model of a power system for a SmartPark solution. Based on this model, SmartPark-based stabilisers have been designed based using phase compensation to improve power system oscillation stability...
While load flow conditions vary with different loads, the small-signal stability of the entire system is closely related with the locations, capacities and models of loads. In this paper, load impacts with different capacities and models on the small-signal stability are analysed. In the real large-scale power system case, the load sensitivity which denotes the sensitivity of the eigenvalue with respect...
In July 2010, the Shanghai Donghai Bridge wind farm, the first commercial offshore wind project was connected to the main grid in China. Three months later, four contracts were handed out to build a total of 1GW wind power capacity in the first round of an offshore concession project by the Chinese central government. At that time, there was a worldwide expectation that Chinese offshore wind power...
A micro-grid is an autonomous system which can be operated while connected to an external system or isolated with the help of energy storage systems (ESSs). While the daily output of distributed generators (DGs) strongly depends on the temporal distribution of natural resources such as wind and solar, unregulated electric vehicle (EV) charging demand will reduce the imbalance between the daily load...
Increased interconnectivity of Supervisory Control and Data Acquisition (SCADA) systems in renewable power system networks can potentially mean greater susceptibility to malicious attackers. SCADA systems have inherent cyber vulnerabilities as these systems were originally designed with limited consideration of cyber attacks or threats. There is little published literature which rigorously considers...
This paper presents damping torque analysis of an automatic voltage regulator (AVR) in a multi-machine power system. Firstly in this paper, mathematic model of a multi-machine power system with AVR considered is described. Damping torque analysis of AVR is established. Then an example three-machine power system is presented to demonstrate how the damping torque analysis for the AVR is carried out...
This paper presents the application of decomposed analysis of damping contribution from a PSS installed in a real large scale Chinese power system. With the decomposition of damping function from the PSS into damping torque contribution and its connections with the power system oscillation mode of interests, a deep understanding on the PSS function is obtained in the complex large scale multi-machine...
This paper presents a case of applying STATCOM/BESS (battery energy storage system) stabilizers in a real large scale Chinese power system to alleviate inter-area power oscillations. As STATCOM/BESS can exchange both active and reactive power with power grid, stabilizers attached to a STATCOM/BESS is able to function to suppress power system oscillations via regulation of active or/and reactive power...
The increased complexity and interconnectivity of Supervisory Control and Data Acquisition (SCADA) systems in the Smart Grid has exposed them to a wide range of cyber-security issues, and there are a multitude of potential access points for cyber attackers. This paper presents a SCADA-specific cyber-security test-bed which contains SCADA software and communication infrastructure. This test-bed is...
Reactive power control is an important control issue for distribution system operators due to increased penetration of distributed generation. The work presented in this paper utilizes the inherent reactive power capability of the doubly-fed induction generator (DFIG) based wind farms to optimize the system losses while considering the network constraints in the system. The IEEE-30 bus system was...
Heat pumps are vitally important for achieving low carbon and renewable energy targets. There is a rapid increase in heat pump installations in the UK and Europe in the last few years for their supporting role towards green energy and demand-side management. The increase in heat pump installation prompts research work on the impact of high penetration of heat pumps on the low voltage network. This...
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