A NOVEL SYSTEM FOR ANALYSIS AND SYNTHESIS OF POWER SYSTEM SIGNALS

摘要

This document discloses a novel system for detection and extraction of usefulsignals for analysis, design, control, and protection of power systems as wellas for powerquality purposes. The proposed system is based on generalization of theconcept ofEnhanced Phase-Locked Loop (EPLL) system. The EPLL and one of its extensionsare first outlined. It is observed that this extension is not direct and someredundanciesare present in its structure which make the system have long transientresponses. Anew generalization of the EPLL to three-phase is presented in this report asthe mostintegral extension of the EPLL with no redundancy of structural components.Having a structure as simple as consisting of nine state-variables (nineintegrators);the proposed structure receives a three-phase set of signals and provides (1)instantaneouspositive-, negative-, and zero-sequence components; (2) steady-state sequence-components.(3) fundamental components; (4) harmonics, (5) amplitudes, (6) phaseangles, and (7) frequency.This three-phase EPLL system can certainly be a building block for almost allofthe signal processing requirements encountered in the context of power systemapplications.Examples are Flexible AC Transmission Systems (FACTS) and Custom PowerControllers. Active Power Filter (APF), Static Compensator (STATCOM), andvarious versionsof Power Flow Controller (PFC) system are specific examples in thiscategory. Particularly, the developed system can be employed as an integralpart ofthe control system of the fast. growing technologies of distributed generationsystemsand renewable energy sources. This is due to the presence of frequencyrecursions anddistortions encountered in these systems which conventional strategies fortheir controlfail to cope with them. The proposed system can equally be used as a basicpart ofthe power quality measurement and monitoring systems which will furnish themwithunique features due to its capabilities.Some typical behaviors of the system are shown using computer simulations inthisreport. However, extensive work must be carried out to investigate performanceof thesystem in various application areas.