xuemei wang, power quality center, , november, 2016 abb

© ABB

| Slide 1

ABB Power World 2016 Power Quality Solution in Distribution Net Work

Xuemei Wang, Power Quality Center, Xi’an ABB Capacitor Company Ltd, November, 2016

November 16, 2016

© ABB

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Power energy is produced,

transmitted and consumed

almost at the same time.

Power energy is irreplaceable.

Destroyers of power quality may

also be victims of the power

energy with poor-quality.

High-quality power energy should

be guaranteed by 3 parties, the

supplier, the distributor and the

consumer.

November 16, 2016

Power QualityBasic Concept

Power energy special product

Voltage, current or frequency

deviation in AC system.

Change of power system network

and structures

Non-linear devices

Industrial automation degree

increased.

Power quality

contradiction between high-tech and poor quality power

© ABB

| Slide 3

Lightning impulse

Switch on capacitor bank or

transformers

Switch on large-load equipment

Non-linear and unbalanced load

Equipment and power grid failure

Misoperation

November 16, 2016

Power QualityProblem Sources

Typical Disturbance

Voltage quality

Current quality

Frequency quality

Definition of power quality

Safety Stable High-quality Economic

© ABB

| Slide 4

Voltage changes:

• Continuous interruption

• Under voltage

• Overvoltage

Voltage waveform distortion,

harmonics, interharmonics and

notches

Voltage fluctuation, transient,

flicker, sag, discontinuity

Voltage frequency deviation

November 16, 2016

Power QualityClassify

Voltage Quality

Current harmonics, interharmonics,

and subharmonics

Noise

Current Quality

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Main concerns:

System losses

System voltage stability

Transmission ability

November 16, 2016

Power QualityPower Grid

Power is commodity

Emphasis on:

Cost saving

Increase earnings

Environment protection

Target

power quality optimization increases load capacity and saves

the cost of power grid

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Main concerns:

Power factor

Voltage stability, continuity and

reliability

Rapid recovery after an accident

November 16, 2016

Power QualityUtility Industry

Power is cost

Emphasis on:

Cost saving

Benefit increase

Target

Less cost, more benefit

© ABB

| Slide 7November 16, 2016

Sweden

HV / PQC/ TLC

India

LV / HV

Xi’an China

HV / LV / PQC/ TLC

HV capacitor：3

LV capacitor：2

PQC: 8

TLC：3

Belgium

LV / PQC / TLC

Tailand

LV

Spain

PQC

Canada

PQC

Dubai

PQC

Brazil

PQC

Australia

PQC

Power QualityABB Overall Arrangement

© ABB


ABB Xi’an Capacitor Company LtdPower Quality Solution and Product

System analysis / Power quality monitoring

Failure analysis / solution

Site commissioning test/ training

Power quality solution for distribution network

Power quality solutions for industrial

MV and HV fixed compensation / filter

MV dynamic reactive power compensation

Series capacitor bank

LV Statcon/PQF/Dynacomp

Capacitor unit

HV: BAM/AAM

LV: CLMD

© ABB


Power QualityPortfolio

© ABB

| Slide 10

Internal fuse External fuse

ABB Xi’an Products

Internal fuse External fuse ABB design Conventional

FuselessConventional

fuseless

Unit Fuse Technology

Fuse Discharge resistor© ABB Group

November 16, 2016 | Slide 10

© ABB


• Improve system power factor

•Provide transmission capacity

•Reduce transmission loss

•Fully use the economic benefits of

equipment

Customer value Open rack Open rack

Cubicle Pole mounted

ABB Xi’an ProductsShunt Compensation Installation

© ABB

| Slide 12© ABB Group


Shunt CompensationImprove System Power Factor

L

Transformer Load

Transmission line

Active power

Reactive power

Transmission line

Transformer Load

Capacitor

L

Active power can be added on the line

𝑐𝑜𝑠𝜑 =𝑃

𝑆=

P

𝑃2 + 𝑄2

P+jQ P+j(Q-Qc)jQc

𝑐𝑜𝑠𝜑′ =P

𝑃2 + (𝑄−𝑄𝑐)2

© ABB



Shunt CompensationIncrease Equipment Utilization Rate

Load Load

Shunt

capacitors

1428 kVA

1000 kW

1009 kvar

Cos = 0.7

1000+j1009

cosφ=0.7

Low power factor,

transformer fully load

AC

Supply

1428 kVA

1111 kVA

1000kW

1009 kvar

482 kvar

Cos = 0.9

22%

available

1000+j482

cosφ=0.9

527kvar

Power factor improved and 22.2%

transformer capacity available

© ABB



Shunt CompensationReduce Transmission Losses

Load Load

Shunt

capacitors

1000+j1009

cosφ=0.7

1000+j482

cosφ=0.9

527kvar Line impedance=R+jXL

Active power consumed by load：

𝐼 =𝑃

𝑈 ∗ 𝑐𝑜𝑠𝜑

𝑃 = 𝑈 ∗ 𝐼 ∗cos𝜑∆𝑃 = I^2 ∗ 𝑅

Line loss：

∆𝑃 = (𝑃

𝑈 ∗ 𝑐𝑜𝑠𝜑)^2 ∗ 𝑅

© ABB



Shunt CompensationImprove Load Side Voltage

负荷 Load

Shunt

capacitors

1000+j1009

cosφ=0.7

1000+j482

cosφ=0.9

527kvar

1U

QXPRU L

U1 U2 U1 U2

𝑈2 = 𝑈1 − ∆𝑈

© ABB



Shunt Capacitor InstallationOpen Rack

© ABB



Shunt Capacitor InstallationCubicle Capacitor Bank

Technical specification

• System voltage：6kV/12kV

• Dimension：

1.6m/1.2m/1m*1.6m*2.25m(L*W*H)

• Enclosure level：IP4X

• Contamination level：II

• Switching type：Step by step automatic

switching or fix switching

• Capacity per step： max 2000kvar

• Product standard：

DLT 604-2009

GB50227

GB11024

MMECB：Modular Metal Enclosed Capacitor

Bank

© ABB

| Slide 18

Technical specification

Shunt Capacitor Installation

Pole Mounted Capacitor Bank

• Voltage rank：6~24kV

• Capacity range：<=

2.4Mvar

© ABB

| Slide 19

Feature & application

Pole Mounted Capacitor Bank

Reduce Transmission Losses, Increase Energy

Efficiency

• Close to loads to

compensation

• Postpone retrofit of current

line and equipment, save

investment

• Reduce transmission loss

• Improve voltage of user side

Application

• Long distance transmission

of rural power grid

• Load Dispersed Oil Zone

System

© ABB

| Slide 20

Providing a low impedance path to the harmonics

Shunt Filter Capacitor BanksFiltering Principle

© ABB Group


Clean power grid

Load

(Harmonic source)

Water purify stationFilter

Polluted current

(harmonics)

Clean waterClean current

Water flow without pollution

(System)

Polluted water

© ABB



ABB Xi’an Power Quality CenterService Cope

Distribution net power quality problem checking

Distribution net power quality problem analysis and simulation

Distribution net power quality solution

Industrial project power quality research report & overall solution making, product proving, on site installation & commission, maintenance & training

On site problem analysis and solving Power quality product & solution

promotion

© ABB



Power QualityOn-site Problem Solving Case

On-sit problem： Big Noise With 7th filter Operating

PQC solutions：

ABB Engineer check and exclude the product quality reason

Simulation & calculation Find reason to the problem, and

provide solution Installed the protection equipment,

Noise disappear ABB PQC provide the PQ test and

simulation again and operating suggestion

xuemei wang, power quality center, , november, 2016 abb

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