2011 IEEE Power and Energy Society General Meeting

Summary form only given. The purpose of this paper is to analyze various approaches to incorporate short-term stored energy resources into the Midwest ISO co-optimized energy and ancillary service market. Based on the analysis, the best approach is to utilize short-term stored energy resources for regulating reserve with the real-time energy dispatch to be set in such a way that the maximum regula... View full abstract»

The modular multilevel converter (MMC) is a newly introduced switch-mode converter topology with the potential for high-voltage direct current (HVDC) transmission applications. This paper focuses on the dynamic performance of an MMC-based, back-to-back HVDC system. A phase-disposition (PD) sinusoidal pulsewidth modulation (SPWM) strategy, including a voltage balancing method, for the operation of ... View full abstract»

Summary form only given. The recently proposed phase imbalanced series capacitive compensation concept has been shown to be effective in enhancing power system dynamics as it has the potential of damping power swing as well as subsynchronous resonance oscillations. In this paper, a comparative effectiveness of two “hybrid” series capacitive compensation schemes in damping inter-area ... View full abstract»

Benchmarking issue in short term load forecasting has not received as much attention as it deserves. Although dozens of techniques have been reported to be applied to short term load forecasting, most of them are still on the theoretical level with insignificant practical value. None of them has been established to produce benchmarking models for comparative assessment. This paper proposes a nai&#... View full abstract»

Considerable research has been conducted on the issues of induced voltage on the pipelines which are close to the high voltage power lines. It has been found that the induced voltage and current on the pipeline are determined by many parameters. This paper presents a comprehensive study on how the various parameters affect the induced voltage and current on the pipelines. In the system modeling pa... View full abstract»

As wind penetration levels on power systems increase worldwide, the dynamic characteristics of these systems are changing due to the displacement of synchronous generation. One issue, of particular concern, is the resulting reduction in system inertia. Modern, variable speed wind turbines are controlled by power electronics and so do not inherently contribute to the inertial response of the system... View full abstract»

Output from a real-time sag, tension and ampacity program was compared with measurements collected on an outdoor test span. The test site included a laser range-finder, load cells and weather station. A fiber optic distributed temperature sensing system was routed along the conductor and thermocouples were attached to the conductor's surface. Nearly 40 million data points were statistically compar... View full abstract»

The number of semiconductor switches in a modular multilevel converter (MMC) for HVDC transmission is typically two orders of magnitudes larger than that in a two or three level voltage-sourced converter (VSC). The large number of devices creates a computational challenge for electromagnetic transient simulation programs, as it can significantly increase the simulation time. The paper presents a m... View full abstract»

This paper presents a smart distribution grid testbed to test or compare designs of integrated information management systems (I2MSs). An I2MS extracts and synthesizes information from a wide range of data sources to detect abnormal system behaviors, identify possible causes, assess the system status, and provide grid operators with response suggestions. The objective of the testbed is to provide ... View full abstract»

Summary form only given. This paper presents a new solution method that combines state-space and nodal analysis for the simulation of electrical systems. The presented flexible clustering of state-space described electrical subsystems into a nodal method offers several advantages for the efficient solution of switched networks, nonlinear functions and for interfacing with nodal model equations. Th... View full abstract»

Summary form only given. This paper presents various synchronous machine models implemented in the computation of electromagnetic transients. The paper proposes new models for achieving better computational efficiency while maintaining precision. In addition to simple infinite bus analysis, the machine models are also compared for a more sophisticated and practical case study. Precision analysis i... View full abstract»

A set of risk indices of weak lines and buses causing static voltage instability and an assessment technique to evaluate the risk indices are proposed. The assessment technique is based on the integration of a quadratic optimization model combined with a line-based voltage stability index into Monte Carlo simulation. The proposed risk indices can be used to differentiate the risk responsibilities ... View full abstract»

Summary form only given. Power transformers can fail from dielectric stresses caused by electromagnetic transients. In this paper we focus on a special phenomenon where excessive overvoltages arise due to resonance. This situation can take place when a transformer on the high-voltage side is connected to a cable and the low-voltage side is unloaded. Very high overvoltages can then result on the lo... View full abstract»

Summary form only given. This paper describes a hybrid procedure for wide-band characterization and modeling of power transformer behavior from frequency sweep measurements. The approach is based on measuring corresponding sets of voltage and current vectors that are associated with short circuit and open circuit conditions. These vectors are stacked side-by-side in two matrices which are used for... View full abstract»

Summary form only given: The paper proposes a detailed model of a gas turbine for a CHP (Combined Heat and Power) plant. The prime mover is endowed with several controls: first of all, a speed control which can be either droop type or isochronous type according to the status of connection to the distribution grid. An acceleration limiter and an exhaust gases temperature limiter intervene to cut th... View full abstract»

The paper investigates the impact of using Static Synchronous Series Compensator (SSSC) in phase imbalanced operation modes on damping subsynchronous resonance in series capacitive compensated transmission grid. Phase imbalance has the potential of reducing the energy exchange between the electrical and mechanical sides of the turbine-generator and, therefore, damps subsynchronous oscillations. Th... View full abstract»

Strict limits of the revised Noise Ordinance of NY City require Power Transformers to have ultra - low levels at each of the frequencies of the transformer noise at full load and over-excitation. This paper describes the development of the technology that allowed successful design and production of Ultra - Low noise Power Transformers recently delivered to ConEd (Consolidated Edison) of NY City. T... View full abstract»

To accommodate higher penetrations level of variable generation, changes will be required to the traditional methods used by system planners and operators in order to maintain ongoing bulk power system reliability. While the focus of this paper is on the integration of wind generation, the conclusions and recommended actions may also apply to the integration of all types of variable generation tec... View full abstract»

This study considers potential system effects from the addition of Plug-in Electric Vehicle (PEV) load to individually metered residential customers together with a concurrent market adoption of Distributed Energy Resources (DER) and energy storage technologies to offset the associated load growth. To evaluate various renewable energy source conditions, a prototypical circuit is evaluated in Detro... View full abstract»

The large increase of Distributed Generation (DG) in Power Systems (PS) and specially in distribution networks makes the management of distribution generation resources an increasingly important issue. Beyond DG, other resources such as storage systems and demand response must be managed in order to obtain more efficient and “green” operation of PS. More players, such as aggregators ... View full abstract»

Summary form only given. A novel, pattern-recognition-based approach for fast detection of power islands in a distribution network is investigated. The proposed method utilizes transient signals generated during an islanding event to detect the formation of the island. A decision-tree classifier is trained to categorize the transient generating events as “islanding” or “non-is... View full abstract»

Positive feedback anti-islanding methods have been widely applied to inverter-based distributed generators recently due to their high cost-performance ratio. The effectiveness of these anti-islanding methods is usually demonstrated by means of steady-state non-detection zones (NDZs) represented in a load parameter space (LPS). However, such NDZs cannot accurately describe the impact of the inverte... View full abstract»

This paper introduces a model developed for modeling the steady-state and the dynamic behavior of the Trans Bay Cable Project as Voltage-Sourced Converter based on the Modular Multilevel Converter design. The model is intended for time domain simulations in an electromechanical simulation program with a balanced positive sequence network representation. Typical applications are transient stability... View full abstract»

Summary form only given: The coupling of fundamental frequency voltages and currents on VSC-HVDC overhead transmission lines from neighboring ac lines is analyzed. The complementary modulation components at dc and 2nd harmonic frequencies on the ac side of the converter resulting from the fundamental frequency coupling are analyzed. A mathematical model is developed for the VSC converter that accu... View full abstract»