Presentation Grid Reliability
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Transcript of Presentation Grid Reliability
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PRESENTATION
ON
Grid Reliability Requirements, Stability andProtection
Presented by : Mr. M.Majumdar
Executive Director ( Commercial)WBSEDCL
10 th April , 2008
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Profile and Energy Scenario of West Bengal :
West Bengal is located in theeastern region of India with anarea of 87853 sq. km and 19districts. West Bengal shares
an international border withNepal, Bhutan and Bangladeshand is surrounded by IndianStates namely, Sikkim, Assam,
Orissa, Jharkhand and Bihar.Main languages spoken inWest Bengal are Bengali, Hindiand English. West Bengal ishaving a total population 80.22million (2001 Census) withdensity of population of 904 perSq.km.
WBSEDCL
http://powermap%2010%20pln%20cea.pdf/ -
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Profile and Energy Scenario of West Bengal :
West Bengal is located in theeastern region of India with anarea of 87853 sq. km and 19districts. West Bengal shares
an international border withNepal, Bhutan and Bangladeshand is surrounded by IndianStates namely, Sikkim, Assam,
Orissa, Jharkhand and Bihar.Main languages spoken inWest Bengal are Bengali, Hindiand English. West Bengal ishaving a total population 80.22million (2001 Census) withdensity of population of 904 perSq.km.
WBSDA
Some Basic Features :
Area 87853 SQ KMNo of Population 80.22 million
Urban Population 28.03 %
Total no of Mouzas 37910
No of Mouzas Electrified 34184
Peak Load : 4900 MW
Off-Peak Load : 3350 MW
Sundarban Mangrove Forest is not connected by Grid Power
Some Special Features about Electricity In West Bengal(as on March 31, 2008)
WBSEDCL
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Profile and Energy Scenario of West Bengal :
West Bengal is located in theeastern region of India with anarea of 87853 sq. km and 19districts. West Bengal shares
an international border withNepal, Bhutan and Bangladeshand is surrounded by IndianStates namely, Sikkim, Assam,
Orissa, Jharkhand and Bihar.Main languages spoken inWest Bengal are Bengali, Hindiand English. West Bengal ishaving a total population 80.22million (2001 Census) withdensity of population of 904 perSq.km.
WBSDA
WBSEDCL
List of Renewable & Co-generation plants selling power to
WBSEDCL :
Sl.No.
Name of theEntrepreneur
LocationType ofproject
Capacity(MW)
1. M/s Electro SteelHaldia, Dist
Purbo MedinipurCoke Oven
plant12.0
2.
M/s Neora Hydro
Ltd.
Neora, Dist
Darjeeling Hydel 3.0
3.M/s. Nippon
Power LimitedLodhama, Dist:
DarjeelingHydel 3.0
4. WBREDAMohan Dairy,Dist: Purulia
Bio-gas Plant 0.03
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Profile and Energy Scenario of West Bengal :
West Bengal is located in theeastern region of India with anarea of 87853 sq. km and 19districts. West Bengal shares
an international border withNepal, Bhutan and Bangladeshand is surrounded by IndianStates namely, Sikkim, Assam,
Orissa, Jharkhand and Bihar.Main languages spoken inWest Bengal are Bengali, Hindiand English. West Bengal ishaving a total population 80.22million (2001 Census) withdensity of population of 904 perSq.km.
WBSDA
WBSEDCL
List of Renewable & Co-generation plants who executed PPA
with WBSEDCL for sale of power:
Sl.No.
Name of theEntrepreneur
LocationType ofproject
Capacity(MW)
1.M/s. Kamarhatti
Co. Ltd.Raina,
Dist: BurdwanBio-mass 6.0
2
M/s. Amrit Bio-
Energy &Industries Ltd.
Bankati, Dist:Bankura Bio-mass 10.0
3.M/s. PCM Hydel
PowerCorporation Ltd.
Chel-I, DistDarjeeling
Hydel 6.0
4.M/s. Shyam
Energy LimitedChel-II, DistDarjeeling
Hydel 6.0
5.M/s. EasternHydro Power
Company Limited
Chel-III, Dist
DarjeelingHydel 4.2
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8/6/2019 Presentation Grid Reliability
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Some salient features of State Electricity Grid Code(SEGC):
Frequency variation : Rated frequency of the system 50 HZ.
and shall normally be controlled within
the bandwidth of 49 to 50.5 HZ
Voltage Variation : Shall not be more than Voltage rangespecified in IE Rules.
Sub-Station Equipment :All equipment shall be designed,manufactured, tested as per IEC /
BIS standard.
Each Connection between anagency and STS shall be controlled
by a circuit breaker capable of
interrupting at the connectionpoint.
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WBSEDCL
Protection systems are to be provided by all entities as
specified by STU.
Requires to isolate the faulty equipment and protect the
other equipments against all types of faults internal /
external within specified fault clearance time withreliability, selectivity and sensitivity.
Relay Setting Coordination shall be done by STU
STU shall arrange periodic meeting with the entities to
discuss coordination of protection.
Protection :
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WBSEDCL
A generating unit shall be capable of continuously supply its
normal rated active / reactive out put with specified systemfrequency and voltage variation.
Generating Unit shall be provided with an AVR, Protective
and safety devices. All Generating Units and associated Electrical Equipment
connected to State Grid shall be provided with adequate
protection so that State Grid does not suffer due to anydisturbances.
Each Generating Unit shall be fitted with a Turbine SpeedGovernor having an over all droop characteristic within therange of 3-6 % .
Each Generating Unit shall be capable of instantaneouslyincreasing out put by 5% limited to 105% MCR whenfrequency falls.
Requirements of Generating Unit:
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WBSEDCL
Every EHT line taking off from generating station or a sub-
station shall have distance protection and back up
protection.
For 132 KV lines three-zone non-switched distance
protection with suitable back-up protections to be used.
Transmission Line Requirements :
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WBSEDCL
All 33 KV and 11 KV lines at connection point shall beprovided with minimum of over current and earth fall
protection with or without directional features as.
Transformer requirements :
For transformers of HV class differential protectionshall be provided for 10 KVA and above.
For transformers of 2.5 MVA to less than 10 MVA timelag over current, earth fault and instantaneous REF
relays.All transformers of 2.5 MVA and above shall be provided
with gas operated relays, winding temperature and oil
temperature protection.
Distribution line requirements:
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WBSEDCL
Communication:
Communication system between grid sub-station
and generating station shall be developed by the
developer at their cost
Developers of co generation and renewable energy
sources shall abide by all applicable codes, rules &
regulations in regard to operational and
commercial practices
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WBSEDCL
Ownership and responsibility of maintaining and
testing of meter shall be mutually agreed
between the entities and the STU.
Minimum standard of accuracy of meter shall be
of class 0.2 or as specified by STU.
All CTs and PTs used for metering shall confirm
to the BIS or standard of IEC.
Metering :
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WBSEDCL
Procedure for connection to STS:
Any agency seeking connection to STS shall submit applicationon specified forms to STU along with the following details:
A report stating the purpose of connection, connection
point ,apparatus to be connected and beneficiaries ofconnection.
Prospective users shall, require to pay STU all chargesas specified by WBERC for conducting initial and anyadditional studies for processing the application.
Construction schedule and target completion date.
A confirmation to abide by the provisions of WBEGC,I.E rules and provisions of the regulation made by theCEA under the Act.
The connection point shall be at licensees gantry in case of CPP
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WBSEDCL
Connection Agreement:
A connection agreement shall include (but may not be limited
to), as appropriate, within its terms and conditions, the
following: A condition requiring both parties to comply with
WBEGC and Grid Code;
The details of connection, technical requirements and
commercial arrangements;
The details of any capital expenditure arising from
necessary reinforcement or extension of the system and
demarcation of the same between the concerned parties;
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WBSEDCL
Connection Agreement: contd..
A Site Responsibility Schedule;
The metering arrangements;
The general procedure, guidelines, etc. on protection and
telemetry;
The procedures necessary for site access, site operationalactivities and maintenance standard for equipment of
Licensee at the premises of the User and vice-versa;
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The Cogeneration and renewable energy sourcesexcepting roof-top Solar PV and Bio gas sources
shall be connected to state grid at a voltage of 33KV or 11 KV subject to technical suitability
Delivery point shall be the nearest grid sub stationof 33/11 KV voltage level
Roof top solar PV system shall be connected at LVor MV or 11 KV
Bio gas plant shall be connected at MV or at 11KV
Connectivity for Co-generation & Renewable
sources as per WBERC regulation:
WBSEDCL
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WBSEDCL
Procedure to be followed for Co-generation & Renewable
Energy Sources:
After preliminary discussions with the buyer licensee, the
developer shall submit full details of the projects alongwith
cost data and financial charges and tariff for direct sale tothe licensee.
The buyer licensee shall examine the tariff proposal in the
light of price reasonableness, impact on consumer tariffand the price cap specified in these regulations.
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WBSEDCL
Procedure to be followed for Co-generation & Renewable
Energy Sources:
MOU / PPA shall be signed between developer and
purchaser. In case of open access, the transmission
and/orwheeling agency shall also be a party to the MOU /PPA. In the MOU / PPA with details of connectivity,
completion of project and commencement of supply,
periods of supply (month wise), time of supply (peak / off
peak), technical & commercial obligation, security and
modes of payment of each party, etc. in line with these
regulations shall be suitably incorporated. The MOU /
PPA, as agreed and signed, shall be submitted to the
Commission.
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WBSEDCL