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This paper introduces a new approach for the optimal management of reactive power, with emphasis on offshore wind power plants. The approach follows a predictive optimization scheme (i.e. day-ahead, intraday application). Predictive optimization is based on the principle of minimizing the real power losses, as well the number of On-load Tap Changer (OLTC) operations for daily time horizon (discretized...
This paper presents a compressive introduction to the development of a simulation platform for smart multi-terminal DC micro-grid (sMTdc), this tool will facilitate the development of DC network to support a low-carbon sustainable electricity supply system. The simulation platform uses a compressive set of high-resolution (1-min) sub-models: generation (photovoltaic, wind power), demand (individual...
Electrical load forecasting in long-term horizon of power systems plays an important role for system planning and development. Load forecast in long-term horizon is represented as time-series. Thus, it is important to check the effect of volatility in the forecasted load time-series. In short, volatility in long-term horizon affects four main actions: risk management, long-term actions, reliability,...
Load forecasting is considered vital along with many other important entities required for assessing the reliability of power system. Thus, the primary concern is not to forecast load with a novel model, rather to forecast load with the highest accuracy. Short-term load forecast accuracy is often hindered due to various load impacting factors. Two of the major impacting factors are day-ahead weather...
The use of multi-terminal HVDC to integrate wind power coming from the North Sea opens de door for a new transmission system model, the DC-Independent System Operator (DC-ISO). DC-ISO will face highly stressed and varying conditions that requires new risk assessment tools to ensure security of supply. This paper proposes a novel risk-based static security assessment methodology named risk-based DC...
The IEC-60909 is based on assumptions that may not be valid for Wind Turbines (WT) with Doubly-Fed Induction Generator (DFIG-WT), since the DFIG has a different short-circuit response compared to the synchronous generator (SG). This paper presents a comparison of short-circuit behaviors of DFIG and SG based on IEC-60909 definitions, in order to assess the differences between the two generators, as...
The characterization of random load behavior has been largely attempted through statistics-based model fitting. Remarkably, the use of Gaussian mixture model (GMM) has proven to be adequate to tackle the heterogeneity and variability of the statistical distribution of loads. In this paper, an application of the Mean-Variance Mapping Optimization (MVMO) algorithm to the identification of the parameters...
Recently, several smart grid applications have been designed to improve monitoring, protection and control of power systems in real time. Most of these emerging approaches exploit the capabilities of wide-area technologies (wide area monitoring, protection and control - WAMPAC). Since WAMPAC implementation requires distributed phasor measurements throughout the system, phasor measurement units (PMUs)...
This paper presents an assessment of the variability on the output power of three different types of wind turbines commercially available. The dynamic response of terminal voltage, active power and reactive power are evaluated using time-domain simulations obtained from DIgSILENT® PowerFactoryTM. The assessment of the variability is performed based on probability density function, Pearson correlation...
This paper presents a survey of the impact of large-scale wind power plants on the identification of Voltage Control Areas (VCAs). A Monte-Carlo based framework is proposed for the probabilistic analysis of variations in the arrangement of the VCAs, the critical buses as well as of estimation of the statistical properties of the loading margin. Test results, performed on the IEEE 39-bus system, showed...
This paper presents a novel approach for determining post-contingency dynamic vulnerability regions (DVRs), oriented to assess vulnerability in real time as part of Smart Grid applications. Based on the probabilistic models of input parameters, such as load variation and the occurrence of contingencies, Monte Carlo-type simulation is performed to iteratively evaluate the system time domain responses...
Proper location and adjustment of power system stabilizers (PSSs) is of great concern to achieve effective enhancement of overall power system damping performance. Thus, the problem of optimal location and coordinated tuning of PSSs (OLCTP) requires the fulfillment of several specifications to ensure system operation with adequate security margins for different operating conditions. This paper presents...
The integration of Paraguaná wind farm imposes several challenges on the operation and control of Paraguaná transmission system. An assessment of the power system variability is imperative for the planning of the essential system reinforcements. The objective of this paper is to evaluate the variability of power flows on the Paraguaná transmission system due to the integration of the new 100MW Paraguaná...
Vulnerability assessment is one of the main tasks in a Self-Healing Grid structure, since it has the function of detecting the necessity of performing global control actions in real time. Due to the short-time requirements of real time applications, the eligible vulnerability assessment methods have to consider the improvement of calculation time. Although there are several methods capable of performing...
Based on wide area measurements obtained by phasor measurement units and probabilistic eigenanalysis, this paper presents an approach to the design of a wide-area supplementary damping controller (WASDC) in order to improve the damping of inter-area oscillatory modes in wind-thermal power systems. Novel probabilistic indexes of controllability and observability are proposed to tackle the selection...
The rapidly growing service-oriented economy has highlighted key challenges and opportunities in ICT-supported service and product lifecycle management. From a service consumer point of view there is no standardized way to locate, evaluate, negotiate and monitor services. Composition of third party services is fraught with uncertainty due to absence of definitive SLAs. Moreover, there is a lack of...
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