Type B, C and D Power Park Modules connected

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Transcript Type B, C and D Power Park Modules connected

RfG Implementation
Fault Ride Through
Antony Johnson
National Grid – Network Capability
Summary
 High level voltage against time curves prepared last year and presented to
the GC0048 Workgroup
 A number of substantive comments received which resulted in further
review
 The high level voltage against time curves for Type B – D Synchronous
Power Generating Modules and Power Park Modules are covered in this
presentation
 These suggested voltage against curves need to be assessed against the
fast fault current injection performance requirements.
 Studies have been started on fast fault current injection and are to be
covered via a separate presentation.
 There is close relationship between fast fault current injection, the fault
ride through voltage against time curves and banding.
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RfG - Fault Ride Through
Requirements – Voltage Against Time
Profile – Figure 3
U/p.u.
1.0
Urec2
Urec1
Uclear
Uret
0
tclear
trec1
trec2
trec3
t/sec 3
Type D Synchronous Power Generating
Modules Connected ≥ 110kV
Type D Synchronous Power Generating Modules
connected at ≥110kV
GB Type D Voltage Against Time Curve
Connection
Point Voltage
(pu)
NOT TO SCALE
1.0
0.9
0.5
0.25
0
0
0.14
0.45
1.5
Time (s)
5
Type C and D Synchronous Power Generating
Modules Connected <110kV
Type C and D Synchronous Power Generating
Modules Connected <110kV
Suggested Voltage Against Time Profile – Type C and D
Connection
Point Voltage
(pu)
NOT TO SCALE
1.0
0.9
0.7
0.10
0
0
0.14
0.45
1.5
Time (s)
7
Type B Synchronous Power Generating
Modules Connected <110kV
Type B Synchronous Power Generating Modules
Connected <110kV
GB Voltage Against Time Profile – Type B
Connection
Point Voltage
(pu)
NOT TO SCALE
1.0
0.9
0.7
0.30
0
0
0.14
0.45
1.5
Time (s)
9
Type D Power Park Modules connected
≥110kV
Type D Power Park Modules connected ≥110kV
GB Voltage Against Time Profile – Type D
Connection
Point Voltage
(pu)
NOT TO SCALE
1.0
0.85
0
0
0.14
2.2
Time (s)
Type B, C and D Power Park Modules
connected <110kV
Type B, C and D Power Park Modules connected
<110kV
GB Voltage Against Time Profile - Type B, C and D
Connection
Point Voltage
(pu)
NOT TO SCALE
1.0
0.85
0.10
0
0
0.14
2.2
Time (s)
Example of PPM connected below 132kV
Voltage - time ride through requirements. Example for a 132kV fault with a two transformer grid substation feeding generation
connected at 33kV
1st 132kV end clears at 100ms, second 132kV end clears at 130ms, 33kV DOC operation clears at 440ms. Tap changer
operation starts at 60 seconds and restores voltage to target at 110 seconds. Vertical line at 180 seconds to at least meet
statutory min voltage level for the connection in question typically 0.94 pu but without a defined end point.
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Issues
 Different voltage against time requirements between Synchronous Type B
and Synchronous Type C and D connected below 110kV
 Retained voltage for Type B, C and D Power Park Modules and Type C
and D Synchronous Plant set to 0.1pu
 Dependency on Banding is also related to Fast Fault Current Injection
(FFCI) and fault ride through capability
 Need to ensure Embedded Generation is not lost for a Transmission
System fault – particularly if the post fault voltage falls within the 0.85 – 0.9
region prior to tap changers operating
 A CBA will need to be undertaken to establish the volumes of Embedded
Generation which could be lost for a Transmission System fault.
 Transition between fault ride through mode and statutory voltage limits
needs to be understood
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