Pouyan Pourbeik

Simultaneous coordination of power system stabilizers and FACTS device stabilizers in a multimachine power system for enhancing dynamic performance

By using the concept of induced torque coefficients, a method is developed for the simultaneous coordination of power system stabilizers (PSSs) and FACTS device stabilizers (FDSs) in order to enhance the damping of the rotor modes of oscillation in a multimachine system. The proposed coordination scheme employs linear programming. However, because eigenanalysis using the QR algorithm is required, it is limited to systems with less than 600-700 states. A case study is given which illustrates the coordination of PSSs and FDSs in a three-area system with 29 stations, 3 SVCs and 400 states.

Interactions between, and effectiveness of, power system stabilizers and FACTS device stabilizers in multimachine systems

Summary form only given as follows. In this paper, it is shown that interactions occur between stabilizers in multimachine power systems, the stabilizers being power system stabilizers (PSSs), FACTS device stabilizers (FDSs) or both. The interactions, which are identified and quantified, may enhance or degrade the damping of certain modes of rotor oscillation. In particular, interactions between PSSs are found to adversely affect the damping of inter-area modes. The analysis of interactions also provides a practical means for quantifying and assessing simultaneously the relative effectiveness of both PSSs and FDSs in damping the rotor modes of oscillation. This is achieved using a stabilizer damping contribution diagram. A theoretical basis is given for the analysis of interactions and the effectiveness of stabilizers; the practical significance and applications are illustrated using a case study on a 3-area, 400-state system having 28 generator groups and a number of FDSs. For systems of more than 600-700 states, the modified Arnoldi method is used for eigenanalysis-based calculations.

Model Validation for Wind Turbine Generator Models

This paper summarizes the work of the Ad Hoc Task Force on Wind Generation Model Validation. The paper describes the concept of model validation, how this applies to wind turbine generation systems, and then gives clear examples of the most recent efforts to achieve model validation for wind turbine power plants. The document ends with a summary of the learning from the work presented and the conclusions which can be derived. Recommendations are made on the path forward for wind turbine generator modeling and model validation, primarily focused on generic models (i.e., standardized and publicly available) for stability analysis in power system studies.

Damping and synchronizing torques induced on generators by FACTS stabilizers in multimachine power systems

Using modal analysis, a new technique is described for calculating the electrical damping and synchronizing torque coefficients induced on generators through the action of FACTS stabilizers in multimachine power systems. At a given modal frequency and for an increment in gain of each stabilizer, it is possible to assess from an array of induced damping and synchronizing torque coefficients the effect of each stabilizer on the damping of individual generators. Furthermore, using this array, the technique is extended to calculate the contribution of each generator to the eigenvalue shift resulting from the gain increment. To illustrate the application and interpretation of the technique, stabilizers for two SVCs are designed to improve the damping of the inter-area mode in a 11 machine, 2 area power system.

Description and technical specifications for generic WTG models — A status report

This paper summarizes work performed by the WECC Wind Generation Modeling Group and the IEEE Working Group on Dynamic Performance of Wind Power Generation regarding generic Wind Turbine Generator models, their development, and specifications.

Validation of power system models

Since models form the basis for most power system studies, power system model validation is an essential procedure for maintaining system security and reliability. The procedure may be viewed as a “top-down” approach to model verification; comparisons with measured data indicate the quality of the overall model. Analysis of the differences demonstrates which subsystem component models need to be revalidated. Numerous examples are presented to illustrate the use and importance of system model validation.

Load model parameter derivation using an automated algorithm and measured data

This paper summaries some of the key results achieved in the second phase of a multi-year collaborative load modeling research project. After having identified suitable types of load monitoring devices, actual field data for load model development and validation were collected at appropriate locations for several months to more than a year in three different utilities. This data was post-processed using an automated methodology to filter out events suitable for load model parameter estimation. Two load model structures were then used with an automated parameter estimation algorithm to fit model parameters using the field data collected. The models thus developed were then validated using Siemens PTI PSS/ETM dynamic simulation program. This whole process resulted in some key insights and valuable conclusions for future load modeling research efforts.

A hybrid model for representing air-conditioner compressor motor behavior in power system studies

This paper presents an automated hybrid model structure for emulating the performance of an air-conditioner compressor motor in power system studies. What is shown in this paper is that the expected behavior of the air-conditioning load can be reasonably emulated, in a bulk system model, to capture the observed delayed voltage recovery for actual system events. The one aspect that is clear is that the minutia of the load characteristics are hard to capture, this lends itself to further work in establishing sensitivity analysis for system studies.

Model Development and Field Testing of a Heavy-Duty Gas-Turbine Generator

This paper presents a detailed account of model development for a heavy-duty gas-turbine generator, based on field testing. Some salient points are discussed. These include a more elegant way of modeling the ambient temperature and frequency dependence of the turbine power output, the deadband in the governor response and the importance of modeling the excitation system limiters for system studies.

Code Shift: Grid Specifications and Dynamic Wind Turbine Models

Grid codes (GCs) and dynamic wind turbine (WT) models are key tools to allow increasing renewable energy penetration without challenging security of supply. In this article, the state of the art and the further development of both tools are discussed, focusing on the European and North American experiences.