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This paper proposes a new control design scheme for doubly fed induction generator (DFIG) based wind generation systems to damp interarea oscillations of power systems. The control system of DFIG consists of two parts. The first part is the primary power and voltage (PV) control. The second part is a supplementary damping controller (SDC) based on PV control, designed to enhance damping of interarea...
This paper calculates the reactive power limit of DFIG (doubly fed induction generator), and discusses the current reactive power control schemes of DFIG. Three methods, which use both the grid and rotor side converters for voltage regulation and reactive power support, are analyzed and compared. This paper presents a new coordinated control strategy, which central idea is to use the grid-side converter...
Distributed generation (DG) technology has drawn increasing attention for its tremendous benefits to customers, utilities and the environment. Furthermore, microturbine based power generation has become the most promising DG for its excellent record of improving system stability and economy. In this paper we develop a complete mathematic model, which includes the microturbine, a permanent magnet synchronous...
Locational Marginal Pricing (LMP) is a novel pricing electricity approach based on short term marginal cost. Compared to the conventional average accounting cost method, the LMP has the merits of real time reflecting electric energy's production cost, stimulating the customers' reasonable electricity consumption and reducing cross subsidies, etc. But the difference among different LMPs results in...
The performance of HVDC system depends on the parameters of control system, and usually PI controllers have been used to adjust system to fulfill desired objectives. However, the optimization methods for PI controllers' parameters of HVDC system are very few up to now. And when the optimization task comes to RTDS, it becomes more complex. This paper introduces the Simplex Algorithm and its application...
With the furtherance of power industry reform, the proposal of low carbon economy and “Green GDP” development patterns have laid a good foundation for power system to deepen generation dispatching reform. On the basis of traditional generation dispatching, this paper analyzes the possibility and necessity of energy saving generation dispatching from different standpoints such as national economy,...
In order to extract the weak partial discharge signals which have been submerged in the strong on-site background noise from power equipments, a new method is proposed based on the basic theory of CL multi-wavelet. In the first place, haar and balanced pre-processing method are used to pre-process the PD signals. And then, the vector thresholding method and the neighbouring coefficients method are...
As an online learning algorithm of approximate dynamic programming (ADP), direct heuristic dynamic programming (DHDP) has demonstrated its applicability to large state and control problems. However, there still lacks of a systemic approach to initialize the network weights for DHDP. In this paper, an improved PID-neural network (IPIDNN) configuration is proposed and applied to the critic and action...
Phasor based Wide Area Monitoring and Control (WAMC) Systems are becoming a reality with increased research, development and deployments. Many potential control applications based on these systems are being proposed and researched. Such applications are either local applications using data from one or a few Phasor Measurement Units (PMUs) or centralized utilizing data from several PMUs. An aspect...
In this paper we present the approach we have taken in the INSPIRE (INcreasing Security and Protection through Infrastructure REsilience) project to increase the protection of Critical Infrastructures (CIs). The core idea of the INSPIRE project is to protect Critical Infrastructures by making the underlying communication network more secure and resilient. In order to do so, we devised a routing mechanism...
Laboratory environments for experimenting on infrastructures are often challenging both technically, politically and economically. The situation is further complicated when the interaction between infrastructures is in focus rather than the behaviours of a singular one. Since ICT often has a key role in experiment management, data gathering and experiment upkeep - controlled experimentation becomes...
Phasor measurement unit (PMU) is an emerging measurement technology for power grids which enables the synchronised high speed measurement with precise time stamps for accurate system comparison over a wide geographic area. PMU measurement quality is the key issue in application purposes. To evaluate the measurement quality, the concepts of total vector error (TVE) and benchmark tests, including the...
As one of the fundamental structures in Smartgrid concept, Microgrid has critical effort on maintaining user's power quality and efficiency therefore reduce energy consumption and carbon emission. Harmonic environment of an electric network means the characteristic of distribution of the harmonic energy, voltage and current, in the network. Harmonic environment of Microgrid is complicated due to nonlinear...
Wide Area Measurements using Phasor Measurement Units have become an important component of modern power system monitoring. Several applications of this technology have been reported in the literature. What is lacking at this time is an assessment of communication requirements of those applications. This paper summarizes the various applications of Wide Area Measurements that have been proposed, and...
Wind energy is the most important type of renewable energy in Europe. The stability of system network operation with a large penetration of wind energy has become one of the most critical issues in the new structure of power systems with different types of generation. In this paper the HVDC and HVAC connection of the wind farm to grid is compared. The HVDC is more advantageous in maintaining the system...
The control systems in current and future power systems need reliable real-time information transmission. Internet Protocol (IP) based communication systems for wide-area frequency stability predictive control systems are proposed in this paper. The key technologies, such as network topology, communication protocols, and communication modes are studied. The frequency stability predictive control algorithm...
Synchronized phasor measurement based Wide Area Monitoring and Control (WAMC) system is becoming a reality within international research and development both in academia and industry. Timely and accurate data with high resolutions holds great promise for more responsible and advanced grid control and operation. Currently, most of the research focuses on the different control schemes and applications...
We report on an recent European Project aimed at assessment of suited Methodologies to measure interdependencies between the Electric and the ICT System. Based on best practices and available data, several different metrics have been defined. Depending on the methodology involved, three main types of metrics can be identified; namely “topological”; “system theory based” and “simulation based” metrics...
This paper deals with the aspects of stability assessment for the VSC HVDC transmission systems that are especially relevant for this technology when applied on a large scale. It focuses on the control strategies for the VSC HVDC transmission necessary to reach a full integration of large offshore wind farms into the power system operation while minimizing the critical situations for the power system...
Smart grids rely on a dependable information infrastructure for the monitoring and control applications. Two elements can enhance the suitability of the communication and control infrastructure for such smart grid applications. Overlay networks allow to resiliently deal with nodes that appear and disappear, as well as with the dynamic nature of the power values these nodes represent in a smart grid...
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