Asian Institute of Technology, Energy field of study 1

INTERCONNECTION OF PHOTOVOLTAIC BASED GENERATION AND ITS IMPACT ON STABILITY OF

ELECTRIC POWER SYSTEM

Committee: Dr. Mithulananthan Nadarajah (Chairman)Dr. Weerakorn OngsakulProf. Yaw-Juen Wang

Presenter: Md.Rakibuzzaman Shah

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Presentation outline

Objectives

Background

Introduction

Results and Discussion

Conclusions

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Introduction

1

Coal fired plants

2

Oil and Gas fired plants

3

Nuclear power plants

Recently

4

Renewable energy based plants

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Introduction (cont.)

Energy sustainability (Sustainable grid)

Energy security issues

Environmental degradation

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Introduction (cont.)

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Background

60% increment

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Background (Cont.)

Intermittent nature of solar radiation.

Power electronic device at the terminal.

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Objectives

To assess the impact of photovoltaic generator on power system oscillatory stability.

To assess the impact of photovoltaic generator on power system static voltage stability.

To assess the economical evaluation of the photovoltaic generator.

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Results and Discussion

Without PV generator With PV generator

Effect of PV generator on IEEE-14 Bus Test System

Oscillatory Stability

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Results and Discussion (Cont.)Effect of PV on EM modes in IEEE-14 Bus Test System

Oscillatory Stability

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Results and Discussion (Cont.)

Effect of radiation level on damping ratio of the critical modes

Oscillatory Stability

No change in damping ratio of the critical

modes

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Results and Discussion (Cont.)

Modes related to generator

Damping ratio with out PV

Damping ratio with PV

G1 0.12 0.13

G2 0.073 0.083

G3 0.11 ------

Most associated states

Eigenvalues with out PV

Eigenvalues with PV

delta_syn1, omega_syn1

-1.092±8.746 -1.0946±8.3752

delta_syn2, omega_syn 2

-0.549±7.420 -0.6421±7.8501

Eigenvalues of Two-area Test System without PV generator

Oscillatory Stability

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Results and Discussion (Cont.)

Damping ratio of EM modes without PV Damping ratio of EM modes with PV

Effect of PV generator on Bangladesh Power System

Oscillatory Stability

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Results and Discussion (Cont.)

LM of IEEE-14 Bus System at base case LM of IEEE-14 Bus System with PV

Loading margin improved (6%)

Static Voltage Stability

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Results and Discussion (cont.)

Voltage profile at LF = 0 Voltage profile near to the collapse point

Static Voltage Stability

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Results and Discussion (cont.)

Case LM (pu)

Base 1.7151

With PHV(250 W/m2)

1.7974

With PHV (400 W/m2)

1.8228

With PHV (550 W/m2)

1.8361

With PHV (750 W/m2)

1.8511

Effect of radiation on system loading margin

Effect of PV generator position on system LM

1.77

1.78

1.79

1.8

1.81

1.82

1.83

1.84

Bus 14 Bus13 Bus 4

Bus No.

LM (P

U)

... 250 W/m2

400 W/m2

550 W/m2

Better LM than without

PV

Static Voltage Stability

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Results and Discussion (Cont.)

LM of Bangladesh Power System at base case

LM of Bangladesh Power System with PV

Static Voltage Stability

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Results and Discussion (Cont.)

Voltage profile at L.F = 0 Voltage profile near to the collapse point

Static Voltage Stability

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Results and Discussion (Cont.)

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

200 250 300 350 367 400 450 500

CO2 tax($/ton)

COE(

$/kW

h)

...

PHV

Gas

Diesel

NPC with emission tax Effect of different CO2 tax

Economical Evaluation

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Conclusions PV generator add more damping to the critical modes of the

power system. Critical modes of the power system are not affected by the

radiation level change. PV generator improves the loading margin of the power system.

Even at lower radiation level, it provides better loading margin than the base case (Without PV).

Comparatively lower CO2 tax makes PV option viable than diesel in case of Bangladesh.

Based on fuel availability and radiation level, different emission taxes can be implemented at different system buses.

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Thank you all