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THE RESEARCH OF STABILITY OF SYNCHRONIZATION PROCESS WITH UNITROL 1000APPLICATION

SINHRONIZCIJAS PROCESA STABILITTES IZPTE IZMANTOJOT UNITROL 1000

E. Ketnere, K. Brzia, A. Mesajevs, G. Orlovskis

Keywords: Synchronization, generator

Introduction

Modern electro technical progress now isdeterminable wherewith developing and initiatingsafe and economical alternating current electricalequipment is simply maintenance.The UNITROL 1000-15 is an Automatic VoltageRegulator of the latest design for synchronous

generators and synchronous motors. Theimplementation of the most advancedmicroprocessor technology together with IGBTsemiconductors enables it to be used in a widerange of applications.The maximum output current is 15 A and thepower input can be from an AC or DC source.The UNITROL 1000-15 has all the elements ofexcitation control built inside. A powerful signalprocessor running extensive control softwareguarantees excellent performance under allconditions. The chopper type power stage, whichcan be supplied from an AC or DC power source,enables the use in varied applications. The frontpanel serves for easy monitoring and configuring.The robust mechanical design guarantees a highreliability. The applications shown here aretypical examples.The UNITROL 1000 standard functions are:

Voltage regulator with PID control algorithm; Cos regulator with PID control algorithm; Reactive power regulator with PID control

algorithm; Excitation current regulator (manual control)

with PI control algorithm;

Internal digital reference values; Bumpless changeover for all modes of

operation; Soft-start function; Reactive current droop for network operation; Reactive power sharing between parallel

machines by RS 485 bus; Modbus serial communication; Volts-per-Hertz limiter; Minimum excitation current limiter;

Three-step delayed maximum excitationcurrent limiter (temperature dependent);

Reactive current limiter as a function of activepower (P/Q);

Stator voltage limiter; Stator current limiter (temperature

dependent); Master/Slave reactive power sharing; Undervoltage detection to activate external

current boost for short circuit support; Open-loop control of output voltage for test

purposes; Built-in step test function; Stand-by mode for redundant backup channel

system; Alarm and Trip signals.

All of the parameter settings for the UNITROL

1000 it is allow following how the changing of aparameter affects the overall behavior of theregulator by referring to the power chart and theoscilloscope function. This means, that theoptimum settings are found within a short time.The single-channel solution, with all thenecessary components installed on a mountingplate, is frequently used for the excitation ofsmaller synchronous machines, e.g. generatorsthat are driven by hydro turbine or by a diesel

Att.1. Ierosmes untana.Fig.1. Shunt excitation with optional

short circuit support.

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engine. This is also a commonly used solution formotor excitation.

The UNITROL 1000-15 is equipped with flexible

interfaces:- 4 digital inputs, 4 digital outputs (or inputs), 3

analog inputs, 2 analog outputs.The four digital outputs can be individuallyredefined as digital inputs. An RS 232 serialinterface is used for PC connection. An RS 485link is used for Modbus serial communication orfor reactive power sharing where two or moregenerators or motors are connected in parallel. ACAN bus is for controlling local extensiondevices.

The automatic synchronization and paralleling ofthe synchronous machine with the line isachieved using the optional integratedsynchronizing function. By settings a few simpleparameters the Unitroll 1000 supplies thecorresponding control signals for the speed

governor and close the circuit breaker is releasedif all conditions are fulfilled.To show serviceability of the exciting generatormodel we shall lead carry out the analysis of asynchronization regime with an infinite powernetwork.

On picture number 5 are given the Unitrol 1000synchronization diagram program visualizationresults, where can see cases of coming into a

synchronous work are resulted at a deviation fromsynchronization conditions.On picture number 6 are given the Unitrol 1000synchronization measurements programvisualization results.To show emergency conditions of the excitinggenerator model we shall lead carry out theanalysis of a synchronization regime with aninfinite power network.

Att.2. Atsevio kanlu sistma.Fig.2. Single-channelsystem.

Att.5. Unitrol 1000 sinhronizcijasdiagrmma.

Fig.5. The Unitrol 1000 sync Diagram.

Att.4. Unitrol 1000 elektrisk; de.Fig.4. The Unitrol 1000 circuit.

Att.3. Unitrol 1000 ievadi.Fig.3. The Unitrol 1000 inputs.

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At the fig. 7 9 are given results for normal casesof coming into a synchronous work are resulted ata deviation from synchronization conditions

generator-network, generator-load 2,2 A andgenerator- double as much load 4,4A.

At the fig. 10 12 are given results foremergency situations cases of coming into asynchronous work are resulted at a deviation from

synchronization conditions generator-network,generator-load and generator-load, whengenerator was initiated into engine conditions.

Att.8. Sinhronizcijas rezultti gadjumamenerators - dubult slodze.

Fig.9. Results for cases of coming into asynchronous work are resulted at a deviation fromsynchronization conditions generator- double as

much load.

Att.8. Sinhronizcijas rezultti gadjumamenerators-slodze.

Fig.8. Results for cases of coming into asynchronous work are resulted at a deviation from

synchronization conditions generator-load.

Att.7. Sinhronizcijas rezultti

gadjumam enerators-tkls.Fig.7. Results for cases of coming into a

synchronous work are resulted at adeviation from synchronization

Att.6. Unitrol 1000 mranas lielumi.Fig.6. The Unitrol 1000 sync measurements.

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Att.11. Matematisks modeles sinhronizcijas rezulttigadjumiem enerators -slodze (5A),kad enerators dzneja rem.

Fig.11. Results for cases of coming into a synchronous work are resulted at a deviation fromsynchronization conditions generator- load (5A), when generator was initiated into engine

conditions.

1

2

4

5

3

1-cos;2-Im;3-p;4-q;

5-Iq.

1

2

3

4

5

6

7

8

Att.10. Matemtisks modeles sinhronizcijas rezulttigadjumiem enerators tkls,(neprtraukta lnija) un enerators - slodze (10A)(prtraukt lnija).

Fig.10. Results for cases of coming into a synchronous work are resulted at a deviation fromsynchronization conditions generator-network (line type) and generator-load (10A), (hidden line type).

1-q (-tkls);2-q (-slodze);3-p (-slodze);4-p (-tkls);5-Im (-slodze);6-Im (-tkls);7-Cos (-slodze);8-Cos (-tkls).

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CONCLUSIONS

On the Unitrols basis there is possible to define

synchronization conditions of generator. Todetermine possible deviation limits on rotationfrequency and mismatch corner of exactsynchronization. It is easy to follow how thechanging of a parameter affects the overallbehavior of the regulator by referring to thepower chart and the oscilloscope function. Thismeans, that the optimum settings are found withina short time. The applied model has shown theserviceability. Also the device allows comparingthe networks and generators currents and voltagein the real time.Four signals can be selected forgraphic display parameter files and graphs can besaved in numerical form for later analysis theresolution of mismatch corner dependence fromtime.The Unitrol 1000 make possible to control,analyze and compare theoretical current, power,mismatch corner results which was received frommathematical models and all componentspractical results. It gives possible to check is thethe oscilloscope is 50 ms, and a total of 20channels are recorded.At the publication was disclose results foremergency situations cases of coming into a

synchronous work are resulted at a deviation from

REFERENCES

1 .. . M.: ; ; 2002.- 607.

2 .. . .: ;1950.- 551.

3 Park K.H. Two reactions theory ofsynchronous machines. Generalized methodanalysis PtI, Trans. AIEE, 1929.- 71p.

4 Dirba J., Ketnere E., Ketners K.Synhronization (resynhronization) modes:modelling and simulation. Latvian Journal ofphysics and technical sciences, Riga, 1999.

5 UNITROL 1000 Compact AutomaticVoltage Regulator for small synchronousmachines, ABB catalog, 2007.

Elena Ketnere, Asoc.Prof.,Dr.Sc.Ing.Riga Technical University,

Power Engineering Institute

Address:Kronvalda blv., 1, LV-

1010, Riga, Latvia

Phone:+3717089929,

fax:+3717089418

Email: ketnere@eef.rtu.lv

Kristna Brzia,ph.Dstudent, Mag.Sc.Ing.

Riga Technical University,

Power Engineering Institute

Address:Kronvalda blv., 1, LV-

1010, Riga, Latvia

Phone: +3717089929Email:berzina@eef.rtu.lv

1 2

3

45

1-Im;2-Iq;3-p;4-q;5- cos.

Att.12. Matematisks modeles sinhronizcijas rezulttigadjumiem enerators -slodze (6A), kadenerators dznj rem.

Fig.12. Results for cases of coming into a synchronous work are resulted at a deviation fromsynchronization conditions generator-load (6A), when generator was initiated into engine

conditions.

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Aleksandrs Mesajevs, ph.Dstudent, Mag.Sc.Ing.Riga Technical University,

Power Engineering Institute

Address:Kronvalda blv., 1, LV-

1010, Riga, LatviaPhone: +3717089928

Email: KBL@inbox.lv

Guntis Orlovskis,

Bakalaurs.

Riga Technical University,

Power Engineering Institute

Address:Kronvalda blv., 1, LV-

1010, Riga, Latvia

Phone: +3717089927

Email:jott@inbox.lv

Ketnere E., Berzina K., Mesnajevs A., Orlovskis G.

The research of stability of synchronization process

with UNITROL 1000 application.

UNITROL 1000 is an automatic voltage regulator of

the latest design for synchronous generators and

synchronous motors. The unit contains the most

advanced microprocessor technology together with

IGBT semiconductor technology (Insulated Gate

Bipolar Transistor). In article is considered theproblem of synchronization conditions execution on

the synchronous generator with an infinite power

network with UNITROL 1000 system application. All

of the parameter settings for the UNITROL 1000 it is

allow following how the changing of a parameter

affects the overall behavior of the regulator by

referring to the power chart and the oscilloscope

function. This means, that the optimum settings are

found within a short time.

On the Unitrols basis there is possible to define

synchronization conditions of generator. To determine

possible deviation limits on rotation frequency and

mismatch corner of exact synchronization.

At the publication are given results for normal cases of

coming into a synchronous work are resulted at a

deviation from synchronization conditions generator-

network, generator-load, generator- double as much

load and emergency situations events, when

synchronous generator was initiate into engine

conditions.

Ketnere E., Brzia K., Mesajevs A., Orlovskis G.

Sinhronizcijas procesa stabilittes izpte izmantojot

UNITROL 1000.

UNITROL 1000 ir jaunas paaudzes sinhrono

eneratoru un sinhrono manu automtiskais

sprieguma regulators. Rakst apskatts sprieguma

regulators ietver sev pusvadtju mikroprocesoru

tehnoloiju, k ar tika aprakstts sinhrono eneratoru

sinhronizcijas process ar UNITROL 1000 iekrtas

paldzbu.

Doto iekrtu iespjas auj sekot eneratoru un tkluparametru izmaim k sinhronizcijas moment, t

ar uzdot laik period. Iekrt ir integrtas

oscilografa funkcijas.

Ar UNITROL 1000 iekrtas paldzbu var noteikt

enertoru sinhronizcijas apstkus. Ir iespjams

noteikt novirzanas robeas rotanas frekvencei un

sinhronizcijas lea nobdei.

Rakst ir vizualizti un apskatti sinhrono eneratoru

ar tklu, sinhrono eneratoru ar slodzi un sinhrono

eneratoru ar dubulto slodzi sinhronizcijas rezultti.

Ievietoti ar sinhronizcijas avrijas remu vizualizti

dati.Simulcijas rezultti pardja, ka izptta

koenercijas sistma strd korekti zem sprieguma

sistm.

E., K., A., .

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