Phần 11 KHÓA ĐÀO TẠO TÍNH TOÁN ỔN ĐỊNH VÀ ỨNG DỤNG TRÊN PHẦN MỀM PSSE CHO KỸ SƯ HỆ THỐNG ĐIỆN (Mô phỏng và tính toán hệ thống điện Việt Nam trên Phần mềm PSSE)

KHÓA ĐÀO TẠO TÍNH TOÁN ỔN ĐỊNH VÀ HƯỚNG DẪN SỬ DỤNG PHẦN MỀM PSSE CHO KỸ SƯ HỆ THỐNG ĐIỆN (Mô phỏng và tính toán hệ thống điện Việt Nam trên Phần mềm PSSE):• Overview of the Vietnamese Power System. • Load Flow Analysis. • N1 Contingency Analysis. • ShortCircuit Analysis. • PV QV Analysis.

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POWER SYSTEM STABILITY CALCULATION TRAINING Day 4 - Overview of the Vietnamese Power System

November 21, 2012 Prepared by: Frida Ceja-Gomez

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OUTLINE

• Overview of the Vietnamese Power System

• N-1 Contingency Analysis

• Short-Circuit Analysis

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THE VIETNAMESE POWER

SYSTEM

Overview of the Vietnamese Power System

&

Load Flow Analysis

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Saved Case File and Slider File

4 THE VIETNAMESE POWER SYSTEM

Saved Case File and Slider File

Today’s exercises will require the following

• Today’s exercises will require the following

files:

September_2013_max.sav

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Region Totals North

6 THE VIETNAMESE POWER SYSTEMRegion Totals - North

• Generate a zone based

report including all the zones

belonging to the North

region

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• Generate a zone based report including all the

zones belonging to the South region

• How is this region different from the North

region?

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Region Totals Central

8 THE VIETNAMESE POWER SYSTEMRegion Totals - Central

• Generate a zone based report including all the

zones belonging to the South region

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• Generate an inter-area flow report for the links p

with China, Laos and Cambodia

• Is power imported from or exported to these Is power imported from or exported to these

countries?

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Running the Load Flow Simulation

10 LOAD FLOW ANALYSISRunning the Load Flow Simulation

• Run the power flow simulation p

• Verify the Progress window Are there any problems?

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• Does the diagram range checking flag any problems? g g g g y p

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Limit Checking Reports

12 LOAD FLOW ANALYSISLimit Checking Reports

• Verify if there are any branch overloads y y

• At what voltage level are the overloads more severe?

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Pl i R li bilit C it i

Planning Reliability Criteria

• The table below shows the current voltage

reliability criteria used in Vietnam

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• Verify if there are any voltage violations at the 500kV y y g

level

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level

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level

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18 N-1 CONTINGENCY ANALYSIS

Preparing the input files for the DFAX file

• Create a subsystem file as shown below

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• Create a monitoring file

voltage below 0.9pu or above 1.1pu g p p

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• Finally, write a contingency file to trip each of

the branches in the high voltage transmission

t system

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Creating the DFAX file

• Go to AC contingency solution (ACCC) and build

the distribution factor data file

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• Verify the output bar for any problems with the

distribution factor file

• Note that several contingencies create islands

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a report of the

non-converged cases eBook for You

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AC Contingency Analysis Reports

• How many contingencies caused non-convergence?

• Would this be resolved by increasing the iteration limit? y g

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AC Contingency Analysis Reports

• Increase the iteration limit and solve again

• Were any contingencies removed? y g

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Contingencies causing non-convergence

• For the loss of line from Bus 52002 to Bus 52062, we could build ,

an SLD to analyze the situation

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• Note that switching this line off creates an island

• This issue would be resolved by adding a parallel

circuit

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Contingencies causing non convergence

• When losing any of the lines with a blue arrow, all the power is going from bus

30102 to 19262 through the remaining line in service (red)

• This line has enough capacity to transfer the required amount of power, which

indicates that the non-convergence is caused by a voltage problem

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• This problem can be corrected by adding a fixed shunt capacitor of 80MVAR at

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AC C ti A l i R lt

AC Contingency Analysis Results

Make sure that the non transformer % units

• Make sure that the non-transformer % units

are in MVA (Misc, options menu)

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AC C ti A l i R lt

AC Contingency Analysis Results

• How many contingencies cause severe line

overloads?

• Make sure that the non-transformer % units are in

MVA (Misc options menu)

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Id tif i l d

Identifying overload causes

• Note that Note that

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O l d S l ti

Overload Solutions

What would you

• What would you

recommend to deal

with this overload?

• What type of RAS

would you propose? y p p

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V lt Vi l ti

Voltage Violations

• Some examples of contingencies causing Some examples of contingencies causing

voltage violations are shown below

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V lt Vi l ti

Voltage Violations

• Which contingencies caused severe

voltage violations?

• At what voltage level are voltage violations

more numerous?

I th lt t bilit ti ill

• In the voltage stability section, we will eBook for You

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VIETNAM SYSTEM –

SHORT-CIRCUIT ANALYSIS

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Automatic Sequencing Fault Calculation in

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• Go to the Fault menu and

select the ASCC option

• Set the pre-fault

conditions as linear

fl d li k power flow and click

Apply

• Choose to analyze

three-phase and line-to-ground

faults

• Select the output as Fault Select the output as Fault

current summary table

• Select only the 500kV

buses

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• Repeat the process but…

• Set the pre-fault

conditions as FLAT

• Be sure to unselect this

option

• Select the output as Fault Select the output as Fault

current summary table

• Select only the 500kV

buses

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Sh t Ci it A l i R lt

Short-Circuit Analysis Results

• Are there any buses with a fault level

exceeding the breaker capabilities?

• Do the results vary with different

pre-fault conditions? If so, why?

• Now perform the short-circuit analysis

for the 220kV b ses

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Sh t Ci it A l i R lt 220kV

46 SHORT-CIRCUIT ANALYSIS

Short-Circuit Analysis Results – 220kV

• Are there any buses with very high fault levels?

• What about the example shown below?

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split the bus?

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VIETNAM SYSTEM – VOLTAGE

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PV Distribution

50 PV ANALYSIS

PV Distribution

Factor File Input

Create a subsystem file that

has the following

subsystems

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Factor File Input

Write the monitoring file Write the monitoring file

as shown to the left

Write the contingency file

as shown to the right

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and create the

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eBook for You

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Transfer Dispatch Methods Subsystem

54 PV ANALYSIS

Transfer Dispatch Methods - Subsystem

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56 PV ANALYSIS

PV Analysis Results

• If you go back to the report for non-converged

contingency, you will see that the list includes

contingency 2

• Check the progress window to see what

prevented the last transfer increase for the base

case

during the last increase for contingency 1

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• We will pay special attention to the contingency single 58 (loss of

line 19262-30102)

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• What can you

tell from the

curve for the eBook for You

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• What can you

tell from the

curve for the

contingency

case?

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64 QV ANALYSIS

QV Analysis Results

• Why did we see such low voltages for

this outage during contingency

l i ? analysis?

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QUESTIONS?

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