PARTNERSHIP TO ADVANCE CLEAN ENERGYDEPLOYMENT PACED TECHNICAL ASSISTANCE PROGRAM Session Contents Applicable standards and regulations for grid connectivity of SPVRT Interconnection technical specifications and requirements ID: 913777
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Slide1
Grid Connectivity & Inspection Procedure
PARTNERSHIP TO ADVANCE CLEAN ENERGY-DEPLOYMENT (PACE-D)TECHNICAL ASSISTANCE PROGRAM
Slide2Session: ContentsApplicable standards and regulations for grid connectivity of SPVRTInterconnection technical specifications and requirementsComponent inspection checklistGrid connected functional safety checklist
Slide3Session: ContentsInterconnection test specifications and requirementsCommissioning testsUnintentional islanding functionality testPeriodic interconnection tests
Slide4Net Metering System without Battery
Slide5Net Metering System with BatteryBattery Bank
To dedicated consumer loads
Slide6Applicable Standards & Regulations for Grid Connectivity of SPVRTCentral Electricity Authority (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013IEEE 1547 – Standard for Interconnecting Distributed Resources with Electric Power System, 2003Central Electricity Authority (Measures Relating to Safety and Electricity Supply) Regulations, 2010Central Electricity Authority (Technical Standards for Connectivity to the grid) Regulations 2007IEEE 519: Recommended Practice and Requirements for Harmonic Control in Electric Power Systems, 2014
Slide7Interconnection Technical Specifications & RequirementsGeneral Requirements (IEEE 1547 / CEA Regulation 2013)
Voltage Regulations
The distributed resources shall not actively regulate the voltage at the point of interconnection
Synchronization
The distributed resource synchronized with electric system shall not cause a voltage fluctuation at the point of interconnection greater than ±5%
Monitoring Provision
Each distributed resource of 250 kVA or more at a single point of interconnection shall have provisions for monitoring its connections status, real power output, reactive power output and voltages at the point of interconnection
Slide8Interconnection Technical Specifications & RequirementsGeneral Requirements (IEEE 1547 / CEA Regulation 2013)
Isolation Device
There should be a manually operating isolating switch between distributed generation resource and electric system, which meets the following requirements:
Allow visible verification that separation has been established
Indicators to show clearly closed and open position
Be readily accessible and be capable of being locked in open position
May not be rated for load-break
Be located at height of 2.44 m above ground level
Slide9Depends on state grid code / SERC regulationNormal capacities and voltages:Capacity
< 4 kW (or 5 / 6 / 7 / 10 kW in some states) connected at 240 VAC, 1φ, 50 Hz
Capacity
> 4kW (or 5 / 6 / 7 / 10 kW in some states) but < 50
kW (or 75 / 100 / 112 kW in some states) connected at 415 VAC, 3φ, 50 Hz
Capacity
> 50 kW
(or 75 / 100 / 112 kW in some states)
< 1 MW
(or 2 / 3 / 4 / 5 MW in some states) connected at 11
kVAC
, 3φ, 50 Hz
*The above mentioned ranges normally fall under grid codes for respective states
Interconnection Voltages
Slide10Interconnection Parameters - 1ParametersReference RequirementOverall Grid Standards
Central Electricity Authority (Grid Standard) regulations 2010
Compliance
Equipment
BIS / IEEE / IEC
Compliance
Meters
Central Electricity Authority (Installation and Operation of Meters) Regulation 2006& Amendments thereof, OERC Generic Tariff Order 2013
Compliance
Safety and Supply
Central Electricity Authority (Measures of Safety and Electricity Supply) Regulation 2010
Compliance
Harmonic Current
IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013
shall not exceed the limits specified in IEEE 519
Slide11Interconnection Parameters - 2ParametersReference RequirementSynchronization
IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013
Every time the generating station must be synchronized to the grid. Voltage fluctuation < ±
5% at point of inter connection
Voltage
IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013
Voltage-operating window should be under operating range of 80% to 110% of the nominal connected voltage. Beyond a clearing time of 2 second, the photovoltaic system must isolate itself from the grid
Flicker
IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013
Should not cause voltage flicker in excess of the limits stated in IEC 61000
Slide12Interconnection Parameters - 3ParametersReference RequirementFrequency
IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013
When the Distribution system frequency deviates outside the specified conditions (50.5 Hz on upper side and 47.5 Hz on lower side), there should be over and under frequency trip functions with a clearing time of 0.2 seconds.
DC injection
IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013
Should not inject DC power more than 0.5% of full rated output at the interconnection point
Power Factor
IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013
While the output of the inverter is greater than 50%, a lagging power factor of greater than 0.9 should operate
Slide13Interconnection Parameters - 4ParametersReference RequirementIslanding and
DisconnectionIEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013
In the event of fault, voltage or frequency variations the PV system must island / disconnect itself within IEC standard on stipulated period
Overload and Overheat
IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013
The inverter should have the facility to automatically switch off in case of overload or overheating and should restart when normal conditions are restored
Paralleling Device
IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013
Paralleling device of photovoltaic system shall be capable of withstanding 220% of the normal voltage at the interconnection point.
Slide14Component Inspection ChecklistSr. No.Item type
Yes
No
1
Installation Layout – is it as per drawing?
2
Inverter IS / IEC standards qualified
3
PV panel IS / IEC standards qualified
4
PV isolators / PV cables IS / IEC standards qualified
5
String level and cumulative protections are provided for over-current
and surges
6
AC disconnect manual switch provided with locking arrangement
7
Meters approved by concerned authority
Slide15Grid Connected Functional Safety ChecklistSr. No.Item type
Yes
No
1
Check whether solar power generation stops automatically when DISCOM supply shut off
2
Confirm Bi-directional flow recorded on net meter
3
Check
‘
Consumption (Import) only
’
mode operation
4
Check operation of Solar (Generation) meter
5
Check all Protections and Earthing points
6
Confirm Solar and Bi-directional meter tested & sealed by DISCOM meter testing lab
Slide16Commissioning TestsAll commissioning tests shall be performed based on written test procedures of equipment manufacturer / system integratorA visual inspection shall be made to ensure that the system earthing is adequate as per standard / regulationA visual inspection shall be made to confirm the presence of the isolation device as required by standard / regulationThe following initial commissioning tests shall be performed on the installed solar PV rooftop system and grid connected inverter prior to the initial parallel connection to the grid: Operability test on the isolation device Unintentional islanding functionality Cease to energize functionality
Slide17Unintentional Islanding Functionality TestIf there is more than one inverter, tests should be carried out for each inverter
SPVR system should produce more than 20% of the rated output of the SPVRT Array or the inverter – whichever is less
This test must be conducted during noon time on a sunny day
Slide18Unintentional Islanding Functionality Test – Test 1Test 1: Inverter must cease supplying power within 0.2 seconds of loss of mains
Step 1:
Keep DC supply from the SPVRT array connected to the inverter
Step 2:
Place the voltage probe in the inverter side of the AC main switch
Step 3:
Turn OFF the main switch, through which inverter is connected to grid
Step 4:
Measure time taken for inverter to cease attempting to export power with a timing device and record
Slide19Unintentional Islanding Functionality Test – Test 2Test 2: Inverter must not resume supplying power until mains have been present for more than 60 seconds
Step 1:
Keep DC supply from the SPVRT array connected to the inverter
Step 2:
Place the current probe in the inverter side of the AC main switch
Step 3:
Turn ON the main switch, through which inverter is connected to grid
Step 4:
Measure time taken for inverter to re-energize and start exporting power with a timing device and record
Slide20All interconnection related protective functions and associated batteries shall be periodically tested at intervals specified by the manufacturer, system integrator or the authority who has the jurisdiction over the DR interconnection
Periodic test reports should be maintained
Periodic Interconnection Tests
Slide21Quiz: Fastest Finger First
Slide22What are the qualifying parameters you will check in the test report or data sheet of a grid connected inverter?What are the grid parameters that inverter must synchronize with?
What is the limit of voltage fluctuation to synchronize a SPVRT inverter?
What are the requirement of AC isolation device between SPVRT inverter and grid as per CEA regulation 2013?
Additional Discussion Points
Slide23Answer the following interconnection requirement Response to abnormal grid conditionVoltage: Above _____ %, Below ______%; Trip within ____ second
Frequency: _____ Hz, below ______Hz; Trip within ____ secondIslanding: Cease within ___ second, Reconnect after ______ second Power quality
DC injection must be limited to ___ %
Limitation of flicker
Harmonics ________ %
Additional Discussion Points
Slide24What are the steps for testing a rooftop PV system before commissioning?How do you carry out an unintentional islanding functionality test?
What is periodic interconnection test and how often this need to carry out?
Additional Discussion Points
Slide2525Anurag MishraSenior Clean Energy SpecialistUSAID/IndiaEmail: amishra@usaid.govDisclaimer:This training material is made possible by the support of the American People through the United States Agency for International Development (USAID). The contents of this material are the sole responsibility of Nexant, Inc. and do not necessarily reflect the views of USAID or the United States Government. This material was prepared under Contract Number AID-386-C-12-00001.