A Study On Digital Real-time Dynamic Simulation And Testing System For The Excitation Regulator Of Synchronous Generator

Modem excitation system of synchronous generator plays an important role in improving the reliability and stability of power systen~ nowadays. Unfortunately, being a sophisticated control system, its own reliability and performance are not satisfied yet in China. Excitation malfunction and disturbance are major causes of generator electrical emergency. Thus, it is important to do the design verifying and equipment dynamic testing of an excitation system by using speqial dynamic testing devices with equivalent models and parameters of the controlled objects in the stage of design, manufacture, commissioning and maintenance in addition to heighten the manufacture grade. So far in China, an excitation regulator is gen~rally adjusted and dynamically tested at site after completed with factory static testing and dynamic testing without matching parameters to its control object and operating environment. Apparently, the non-bumpless site testing is harmful for the generator as well as the power system, even though, there is no possibility for the system short circuits and stability testing. Thus, for specified excitation equipment, its performance data under emergency conditions cannot have been derived beforehand. In this paper, after taking into consideration the balance of real time simulation, modeling accuracy and device economy, the Digital Real-time Dynamic Simulation and Testing System for the Excitation Regulator of Synchronous Generator (RTDTS) is issued. Within the study, improved models of excitation system are studied, various typical excitation components are modeled, detailed generator models, general turbine and shaft models, velocity control facility models, simple transformer and power transmission models as well as models for simulation various short circuit or trip conditions are selected. These models that are corn puterized and digital real time integrated into generator-infinitive source model that is an ideal power system model æ¡°l? form the software base of the real time digital simulation. Also within the study is the special interface between the software and an excitation reality. The interface is necessary for translating their conventional outer signals to each other. RTDTS can perform real time excitation device testing and simulation under various conditions assumed and has the features of flexible parameter adjustment, compact size, low cost, easy operation and preparedness for interfacing the excitation devices. RTDTS gives a method and device solution for transplanting the excitation device to its virtual future operating environment with generator and power system detailedly simulated during pre-study, testing and commissioning. As the result of verifying procedure for the RTDTS provided in the paper, it is possible to use digital real time simulation method to simulate and test excitation system with a model generator in a simplified power system. RTDTS fulfills the real time and accuracy requirement of dynamic testing for the excitation system and is significant in enhancing the reliability and performance of excitation system.