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Identification of synchronous machine parameters using broadband power excitations

An interactive Graphical User Interface (GUI) package for the design, simulation and analysis of a power plant electrical auxiliary system is presented in this paper. The purpose of this package is to assist the engineer in performing non real-time, what-if analysis, in an interactive and intuitive environment. The package, AUXSYS, is capable of performing load flow and motor starting simulations. It provides a graphical interface for designing the one-line diagram of the plant and analyzing the output of the simulation. It is implemented for use on PC's. A power plant electrical auxiliary system is similar to a large power system and can be analyzed via load Bow, fault study etc. The purpose of AUXSYS is to provide an easy and intuitive way for engineers to study the electrical systems of power plants. It provides an interface for the analysis of power plants where the engineer can interact with a graphical model of the plant and analyze the plant through direct manipulation of the model. We model the steps taken by an engineer in studying the plant as (a) design, (b) simulation, and (c) analysis. In the design part, the visual representation of the devices and the configuration of the plant are created or modified. The simulation part approximates the behavior of the plant for the given configuration. In the analysis part, the results of the simulations can be viewed. Iterating through the above steps enables the engineer to perform "what if" studies on the plant. To accurately simulate and analyze the electrical behavior of the auxiliary system, the effects of the main network needs to be considered. The power plant electrical auxiliary system can be viewed as an isolated system with boundary lines connecting the plant to the main network. To this end, we separated the plant one-line diagram and the boundary one-line diagram. The boundary system can be configured similarlyto the plant and can be used to simulate different loading patterns on the plant. AUXSYS consists of six modules. These are: symbol builder, design, load flow simulation, motor starting simulation, load flow analysis and motor starting analysis. The user interacts with the design and the analysis modules. The simulation modules are invoked transparent to the user The symbol builder module is used to design the visual representation(s) (icons) of a device and maintain the catalog of the devices used in designing the one-line diagram. Typically, the representation of the devices will be designed once and reused in multiple one-line diagrams. The design module is used to edit the configuration of the plant and boundary systems and interface to the simulation programs. The configuration of system is defined by the schematic of the one-line diagrams, the data associated with the components of the system and the state of the devices. The simulation modules are invoked on the plant and boundary configuration from the design module. The data required for running the simulation is generated automatically from the current configuration of the plant and boundary systems. The load flow simulation of the plant is achieved using the fast decoupled load flow. The user is presented with a graphical output of the real and reactive convergence of the bus power mismatch during the simulation. The load flow analysis module displays the results of the simulation on the one-line diagram of the system. The results include bus voltages, generation, mismatch, line flows etc. The user can scroll through the plant and boundary one-line diagrams and view these results. AUXSYS provides for two methods of motor starting. These are the static and dynamic motor starting. The user chooses the motors, for which the motor starting simulation should be performed, interactively, in the design module. A maximum of four motors can be started per simulation. In static motorstarting, a load flow simulation is performed on the system, in which each motor load is multiplied by a constant factor. The output of the simulation is analyzed through the load flow analysis module. In the dynamic motor starting simulation module, the motors can be started either sequentially or simultaneously. The machine transients and subtransients can be studied with this module. In the dynamic motor starting analysis module, the variation of motor parameters (Y-axis) against time (X-axis) can be plotted and compared. This module allows for up to four different motor starting simulations to be compared at one time. The parameters that can be viewed include slip, speed, motor and load torque, current angle and magnitude, voltage angle and magnitude. AUXSYS is currently used to model Wisconsin Electric Power Company's power plants with wider deployment planned in the near future. The features of the package help engineers in the visual dissemination of information during the design, simulation and analysis of the power plant electrical auxiliary system.