Phần 3 KHÓA ĐÀO TẠO TÍNH TOÁN ỔN ĐỊNH VÀ ỨNG DỤNG TRÊN PHẦN MỀM PSSE CHO KỸ SƯ HỆ THỐNG ĐIỆN (Thực hiện tính toán mô phỏng trên Phần mềm PSSE với hệ thống điện 24 nút của IEEE)

THỰC HIỆN TÍNH TOÁN MÔ PHỎNG TRÊN PHẦN MỀM PSSE VỚI HỆ THỐNG ĐIỆN 24 NÚT CỦA IEEE. NỘI DUNG CHÍNH PHẦN 3 (Calculation for IEEE 24 Bus System): 1. Overview of the IEEE 24 Bus System. 2. Load Flow Analysis. 3. N-1 Contingency Analysis. 4. Short-Circuit Analysis. 5. PV-QV Analysis. 6. Dynamic Analysis of 3ph and SLG Faults.

A Division of Global Power

POWER SYSTEM STABILITY CALCULATION TRAINING Day 1 - Review of the Main Topics Covered in Course A

December 6, 2013 Prepared by: Frida Ceja-Gomez

• PV & QV Analysis

IEEE 24 BUS SYSTEM REVIEW

System Components

&

Load Flow Simulation

Reliability Test System

• Two areas (230kV &

• Open the saved case file and

the single line diagram

• Run a power flow simulation;

no errors should be

encountered

encountered

• Identify the main direction of

the power flow on the SLD

Reports to identify overloads

or voltage issues

Eliminating the overloads

• All the transforms originally had a rating of 100MVA

• It was necessary to modify the transformers’ ratings as

shown below

• Note that the resistance/reactance values do not need to

be modified since these parameters were input with

respect to the winding MVA base, which was left

unchanged

Correcting the voltage issues

we added a fixed shunt capacitor of 75 MVAR at

bus 3

10, 11 and 14, we placed a fixed shunt capacitor

Swing bus reactive power

• To correct this problem, it was necessary to

increase the scheduled voltage at nearby PV buses

increase the scheduled voltage at nearby PV buses

to encourage other machines to increase their reactive power output

• Specifically, we modified the scheduled voltage at

bus 23 to 1.03pu

IEEE 24 – N-1 CONTINGENCY

ANALYSIS

Preparing the input files for the DFAX file

below, which the whole system as well a

subsystem for each area

Preparing the input files for the DFAX file

• overloads on all branches

• the buses for each subsystem having a

• the buses for each subsystem having a

voltage below 0.9pu or above 1.1pu

Preparing the input files for the DFAX file

each of the branches in the system, one at a

time

Creating the DFAX file

build the distribution factor data file

Creating the DFAX file

the distribution factor file

bus

AC Contingency Analysis Report

AC Contingency Analysis Results

overloads?

AC Contingency Analysis Results

major overloads?

prevent excessive overloads?

power compensation to keep the

voltage within acceptable limits? If so,

where?

Remedial Action Schemes

upgrade lines, it is necessary to

develop operational measures to

protect lines and other equipment from

protect lines and other equipment from

high overloads

you implement for the safe operation of

this system?

IEEE 24 – SHORT-CIRCUIT

ANALYSIS

Negative and Zero Sequence Parameters

there was no input data for the zero

sequence parameters

the negative and zero sequence

parameters are not available?

Negative and Zero Sequence Parameters

• Negative-sequence impedance is equal to

positive-sequence impedance for all equipment

• Zero-sequence impedance of generators is equal to ¼

of positive-sequence impedance

of positive-sequence impedance

• Zero-sequence impedance of transformer is equal to

positive-sequence impedance

• Zero-sequence impedance of lines is equal to three

times the positive-sequence impedance (B0 = ½ B1)

Automatic Sequencing Fault Calculation in

PSS®E

• Go to the Misc menu,

and select Change

Program Settings

• Change the

short-• Change the

magnitude and angle

Automatic Sequencing Fault Calculation in

PSS®E

and select the ASCC

option

• Set the pre-fault

conditions as the linear

power flow

three-phase and

line-to-ground faults

Fault current summary

Automatic Sequencing Fault Calculation in

IEEE 24 – VOLTAGE STABILITY eBook for You

to study the loss

of each one of the

transformers

• Set the initial

• Set the initial

PV Analysis Results

• In Course A, we had

plotted the voltage

at Bus 14 for each

contingency

• What is the point of

• What is the point of

voltage collapse for

for each case?

• Which one seems

to be the worst

contingency?

for each case?

• Are there any

unstable

points?

IEEE 24 – DYNAMIC ANALYSIS eBook for You

Dynamic Analysis Setup

• Prepare the IEEE 24 saved

case file (V32) to use for

dynamic simulations

• Load the dynamics data file

that you created in Course A

• Set the required simulation

option options, as shown to

the right

• Do not forget to define the

output channels; select all

machine angles and bus

voltages

Initializing the dynamic simulation

• Go to Perform Dynamic Simulation and initialize

• There should not be any errors as shown below

• Do you recall any problems found in Course A with the

dynamic analysis file we created initially?

Line Fault

• Run the

simulation to 1s

• Apply a 3-phase

line fault on the

line from Bus

21 to Bus 22

• Leave the fault

for 5 cycles

• Trip the affected

line and run the

simulation ten

more seconds

3-Phase Line Fault Results

• What can be said of the machine angles?

3-Phase Line Fault Results

• What about the bus voltages?

• Leave the fault

for 5 cycles and

3-Phase Line Fault Results

• Match the events in the progress window to the plot

3-Phase Line Fault Results

• What can be said about the bus voltages?

single-line-to-ground fault on the

line shown to the

right

Applying a SLG Line Fault

• Choose the In-line fault option (the

model assumes both breakers are

Applying a SLG Line Fault

(Note that in this case we assumed that there is no

re-closure of the line and that the line breakers only have

3-pole reclose capability)

SLG Line Fault Results

• Do the machine angles reach stability?

SLG Line Fault Results

• What about the bus voltages?

Single Pole Auto-reclose)

• Initialize a new dynamic

simulation and run to 1s

• Go to the disturbance menu and

apply a branch unbalance

• Again, select the branch from

• Run the simulation for 5 cycles

Single Pole Auto-reclose)

menu and select the One phase

open option

• Run the simulation for 24

additional cycles

phase by modifying the line

parameters R, X, B

• To close the open phase, replace

the original R, X and B line

parameters in the converted

saved case file (this also removes

Pole Auto-reclose)

• Do the machine angles reach stability?

Pole Auto-reclose)

• What about the bus voltages?

Single Pole Auto-reclose)

• The steps for this simulation are outlined below:

• Initialize and run simulation to 1 second

• Apply an in-line SLG fault to the line from Bus 11 to Bus 14 (1/5

of the line, closer to Bus 14) and run for 5 cycles

• Open the faulty phase and run for 24 cycles

• Close the open phase (by replacing the original R, X B)

• Apply the in-line fault again and run for 5 cycles

• Trip the line

• Run for 20 additional seconds

Pole Auto-reclose)

• Do the machine angles reach stability?

Pole Auto-reclose)

• What about the bus voltages?

Stability Analysis

different event sequences simulated for SLG

faults?

IEEE 24 test system in general (3-phase,

QUESTIONS?

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