software aspects of pq in a dg context by dr. siri varadan

Software Aspects of PQ Software Aspects of PQ in a DG Context in a DG Context

ByBy

Dr. Siri VaradanDr. Siri Varadan

2DG Conference, Clemson, SCDG Conference, Clemson, SC

March 13-15, 2002March 13-15, 2002

OverviewOverview IntroductionIntroduction

– PQMSPQMS

– Basic Components of a PQMSBasic Components of a PQMS

Modular System DesignModular System Design– BenefitsBenefits

– Functional DesignFunctional Design

– Data Flow, Analysis, ReportingData Flow, Analysis, Reporting

DG Specific ApplicationsDG Specific Applications ConclusionsConclusions


March 13-15, 2002March 13-15, 2002

Power Quality Monitoring Power Quality Monitoring SystemsSystems

Integrated systems of several PQ monitors Integrated systems of several PQ monitors are being set upare being set up– increasing number of monitorsincreasing number of monitors– emerging computer technologies on hardware emerging computer technologies on hardware

and software areaand software area– different architectures that serve all PQ different architectures that serve all PQ

monitors with a single large databasemonitors with a single large database» client-serverclient-server» Intranet/InternetIntranet/Internet


March 13-15, 2002March 13-15, 2002

Power Quality Monitoring Power Quality Monitoring SystemsSystems

AdvantagesAdvantages– efficient and fast analysis of large volumes of dataefficient and fast analysis of large volumes of data– establish centralized PQ dataestablish centralized PQ data– usage of standard PQ indices within the utilityusage of standard PQ indices within the utility– standardization of customer complaint evaluationstandardization of customer complaint evaluation– modular, expendable and portable system designmodular, expendable and portable system design– reduction in system maintenance and expansion costsreduction in system maintenance and expansion costs– standard data analysis tools on LAN/WAN, Intranet, standard data analysis tools on LAN/WAN, Intranet,

etc.etc.– centralized security systemcentralized security system


March 13-15, 2002March 13-15, 2002

Main PQ Monitoring System Main PQ Monitoring System ComponentsComponents

Communication System - physical media (fibre Communication System - physical media (fibre optics, copper, wireless, etc), modems (DSL, optics, copper, wireless, etc), modems (DSL, telephone, etc.), Ethernet network components telephone, etc.), Ethernet network components (switches, routers, etc), etc.(switches, routers, etc), etc.

Information Technology (IT) System - computers Information Technology (IT) System - computers (data servers, polling stations, client stations, etc), (data servers, polling stations, client stations, etc), system software (operating system, etc), database system software (operating system, etc), database system, protocol converters, user applications system, protocol converters, user applications (GUI, analytical applications, alarm and (GUI, analytical applications, alarm and information dispersal software, web publishing, information dispersal software, web publishing, etc.), etc. etc.), etc.


March 13-15, 2002March 13-15, 2002

Main PQ Monitoring System Main PQ Monitoring System ComponentsComponents

Monitoring System - instrumentation (PQ Monitoring System - instrumentation (PQ monitors, RTUs, sensors, etc), data retrieval and monitors, RTUs, sensors, etc), data retrieval and

configuration software, etcconfiguration software, etc


March 13-15, 2002March 13-15, 2002

PQ Monitoring System PQ Monitoring System ComponentsComponents

Monitoring system

WAN

Pollingserver

ODBCdatabase

Database/Applicationserver

Communication system

IT system

End users

PQ Monitors


March 13-15, 2002March 13-15, 2002

Modular System Design - Modular System Design - BenefitsBenefits

Removes vendor dependencies - The best alternatives, specific to meet all of the utility’s requirements, are used

Easy implementation of analysis applications – Analytical applications can be written that use the

‘standardized databases

– Industry standard and vendor independent applications, each best suited to meet utility’s requirements


March 13-15, 2002March 13-15, 2002


Ease in implementation of web reporting Ease in implementation of web reporting applications - Latest web hosting and interactive applications - Latest web hosting and interactive site technologies can be used.site technologies can be used.

Economic benefits - With several alternative Economic benefits - With several alternative systems, price of the individual modules is more systems, price of the individual modules is more competitivecompetitive


March 13-15, 2002March 13-15, 2002


Maintenance of a standard databaseMaintenance of a standard database– Allows cheap and regular maintenance. Facilitates easy Allows cheap and regular maintenance. Facilitates easy

database expansion. Single database ensures that there database expansion. Single database ensures that there is no duplication of data from all current and potential is no duplication of data from all current and potential future power quality monitors.future power quality monitors.

Existing trained personnel can quickly come up to Existing trained personnel can quickly come up to speed with the operation & maintenance of the speed with the operation & maintenance of the system - No new elaborate training is necessarysystem - No new elaborate training is necessary


March 13-15, 2002March 13-15, 2002


Future subsystem components can be Future subsystem components can be selected solely on their merit - ‘Vendor-selected solely on their merit - ‘Vendor-independence’ independence’

Modular design allowsModular design allows– utilization of future advances in utilization of future advances in

instrumentation, communication, and software instrumentation, communication, and software technologiestechnologies

– utilization of upgrading without a major utilization of upgrading without a major investment in a complete system overhaulinvestment in a complete system overhaul


March 13-15, 2002March 13-15, 2002

Conceptual DesignConceptual Design Future expandability; plug-and-play concept

Database

Leased Lines or other media

Fiber Optics and DSL modems

Instrumentation

Database serverMeter server

LAN

End user

Required software - Communication- Data logging - Configuration

Current PQ meters Future PQ meters


March 13-15, 2002March 13-15, 2002

Functional DesignFunctional Design

ODBCDatabase

ProprietaryDatabase

User Interface

FutureApplications

PQ SystemCharacterization

WEB Reporting

Data Managing, Analysis& Reporting

Polling & Downloading

Applications Software


March 13-15, 2002March 13-15, 2002

Software ModulesSoftware Modules

Data from Communication server

ODBC database Application

server

3 component analysis

‘Basic’ softwareis installed on the Communication server

Harmonicanalysis

Web reporting

Event reporting

PQ characterization

Independent software modules, each of which can be modified/upgraded independently

Import/Export of datato other formats

(PQDIF , COMTRADE , etc)


March 13-15, 2002March 13-15, 2002

Data FlowData Flow

Data Managing & Reporting

Standard Interfaces

PQ System Characterization

WEB Reporting

Data Analysis & Reporting

Basic Software 3 Component Analysis Harmonics Analysis

Alarms

Proprietary Database

Polling

User Interface

ODBC Database

SQL


March 13-15, 2002March 13-15, 2002

Data Analysis and ReportingData Analysis and Reporting

ODBC compliant databaseOracle or SQL serverDisturbance reports

Event-based reportsPeriodic reportsTrending reports

Data Managing& Reporting

Data Analysis& Reporting

Expertsystem rules

ODBC data

CalculationModules

Display

Extract

ODBC compliant databaseOracle or SQL serverDisturbance reports

Event-based reportsPeriodic reportsTrending reports

Data Managing& Reporting

Data Analysis& Reporting

Rule-basedSystem

ODBC data

CalculationModules

Display

Extract


March 13-15, 2002March 13-15, 2002

Data Analysis and ReportingData Analysis and Reporting Calculation ModulesCalculation Modules

– RMS, Root Mean Square, (voltage or current)RMS, Root Mean Square, (voltage or current)– SARFISARFI– Fundamental voltages and currents of Fourier seriesFundamental voltages and currents of Fourier series– Total voltage harmonic RMS, etc.Total voltage harmonic RMS, etc.

Expert system rules constitute a simple if-and-then Expert system rules constitute a simple if-and-then logic for combining windowed time data with logic for combining windowed time data with relational and topological datarelational and topological data

Extract module basically extracts the required Extract module basically extracts the required portion of the data from database tablesportion of the data from database tables

Display is in the form of graphs, tables and textDisplay is in the form of graphs, tables and text


March 13-15, 2002March 13-15, 2002

DG Specific PQ Applications ?DG Specific PQ Applications ?

Event AggregationEvent Aggregation Use of Intelligent schemes for post-Use of Intelligent schemes for post-

processingprocessing Centralized data analysisCentralized data analysis Cross-communication between different Cross-communication between different

measuring units for real-time diagnostics; measuring units for real-time diagnostics; classification etc.classification etc.


March 13-15, 2002March 13-15, 2002

DG Specific NeedsDG Specific Needs

Protection issues – How and what caused Protection issues – How and what caused the problem?the problem?

Potential conflicts with PQ design and DG Potential conflicts with PQ design and DG objectivesobjectives

Operational conflictsOperational conflicts Ability to analyze conditions leading to Ability to analyze conditions leading to

resonance etc.resonance etc.


March 13-15, 2002March 13-15, 2002

ConclusionsConclusions Modular – system components can be changed Modular – system components can be changed

without major modificationswithout major modifications Expandable – new monitoring systems can be Expandable – new monitoring systems can be

added without a complete system overhaul added without a complete system overhaul Easier to maintainEasier to maintain Standard unified set of tools across the usersStandard unified set of tools across the users Customizable PQ applications with DG Customizable PQ applications with DG

systemssystems

software aspects of pq in a dg context by dr. siri varadan

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