DEVIATION SETTLEMENT.pdf

CERC (Deviation Settlement Mechanism and related matters)

Regulations,2014

Effective from 17.02.2014

2/11/2014 1ERPC, KOLKATA

S.KEJRIWAL ( Executive Engineer, Commercial), ERPC , KolkataMob: 09831919509

E-mail : [email protected]

Replacement of existing UI Regulations which is effective since 17.09.12

Objective: Discourage deviation from Schedule Operate within the freq band Ensure grid security Operation of network elements within acceptable limits Operation of network elements within acceptable limits

Important Changes vis--vis Existing UI regulation: Buyer/Seller Rate vector:


SL No EXISTING UI RATE

1 f>=50.20Hz, RUI=0

2 50.20>f>=50.00, RUI increases by 16.5 p/u for each 0.02Hz step

3 50.00>f>=49.8,RUI increases by 28.50 p/u for each 0.02Hz step

4 49.8>f>=49.50, RUI increases by 28.12 p/u for each 0.02Hz step

5 f

SL No NEW RATE FOR DEVIATION CHARGE

1 f>=50.05Hz, RDC=0

2 50.05>f>=50.00, RDC increases by 35.6 p/u for each 0.01Hz step

3 50.00>f>=49.7, RDC increases by 20.84 p/u for each 0.01Hz step

4 f

BUYERs/SELLERs

1. Overinjection/Underdrawal:

Charges for Deviation receivable foroverinjection/underdrawal in a time block withinthe volume capping of 12% of Schedule or 150MWwhichever is less in normal Deviation Chargedepending on freq.whichever is less in normal Deviation Chargedepending on freq.

For any overinjection/underdrawal beyond thevolume capping limit in a time block, the chargesreceivable is zero.

Additional Charges for Deviation foroverinjection/underdrawal in any time block whenf>=50.10Hz at 178 p/u


2. Overdrawal/Underinjection:A. Charges for Deviation payable for

overdrawal/underinjection in a time block in normalDeviation Charge depending on freq.

B. Additional charges for Deviation levied foroverdrawal/underinjection beyond the volume cappinglimit as follows:

Freq ---- 49.7 Hz and above Freq ---- 49.7 Hz and abovea. 12% of Sch in a time block < = 150 MW

Overdrawal/Underinjection

12-15% 15-20% Above 20%

Additional Charges for Deviation

20 % of NormalDeviation Charge

depending on average freq of that

block



block



block2/11/2014 6ERPC, KOLKATA

b) 12% of Sch in a time block > 150 MWOverdrawal/

Underinjection150-200MW 200-250MW Above 250MW

Additional Chargesfor Deviation

20 % of NormalDeviation Charge depending on average freq of that block



This is a new provision added to this regulation.

Freq ---- Below 49.7 Hz

Additonal Charges levied = 824.04 p/uTotal Charges = 1648.08 p/u


ILLUSTRATION:Buyer/Seller : Underdrawal/Overinjection:Sch Act Dev Freq Dev Rate Min

(12% ofCol2,150)

Dev Charge Receivable

Quantum of Deviation for Addl Dev Charge

AdditionalDev Charge Payable

1 1450 1480 30 49.9 407.24 150 30*407.24 0 0

2 1450 1680 230 50 178 150 150*178 0 0

3 1200 1380 180 49.96 261.36 144 144*261.36 0 0

4 1300 1350 50 50.12 0 150 0 50 50*178

5 -120 -100 20 49.9 407.24 14.4 14.4*407.24 0 0

6 -1300 -1210 90 50 178 150 90*178 0 0

7 -1300 -1140 160 49.96 261.36 150 150*261.36 0 0

8 -1150 -1010 140 49.84 511.44 138 138*511.44 0 0

9 -300 -240 60 50.18 0 36 0 60 60*1782/11/2014 8ERPC, KOLKATA

Sch Act Dev Freq Dev Rate Min (12% ofCol2,

150)

Dev Charge Payable

Quantum of Deviation for Addl Dev Charge

Additional Dev Charge Payable

1 1450 1420 -30 49.9 407.24 150 30*407.24 0 0

2 1450 1190 -260 49.8 594.8 150 260*594.8 110 50*0.2*594.8+50*0.4*594.8+10*594.8

Buyer/Seller: Overdrawal/Underinjection:

3 1180 940 -240 49.75 678.16 141.6 240*678.16 98.4 35.4*0.2*678.16+59*0.4*678.16+4*678.16

4 1180 1150 -30 49.68 824.04 141.6 30*824.04 30 30*824.04

5 -400 -435 -35 50.01 142.40 48 35*142.4 0 0

6 -400 -485 -85 49.86 469.76 48 85*469.76 37 12*0.2*469.76+20*0.4*469.76+5*469.76

7 -1400 -1665 -265 49.91 365.56 150 265*365.56 115 50*0.2*365.56+50+0.4*365.56+15+365.56

8 -250 -282 -32 49.61 824.04 30 32*824.04 32 32*824.04


In a time block: Sch injection = 1450MW Act injection= 1190MWDeviation =1190-1450 = -260MW Freq = 49.8 Hz, Dev Rate = 594.80 paisa/unit Min ( 12% of Sch=174MW, 150MW) = 150MW Total underinj allowed without levy of Addl Charge for Deviation = 150MWQuantum of Underinjection on which Addl Charges for Deviation to be levied = 260-150 = 110 MW

(200-150)*20% of (250-200)*40% of (110-50-

150-

200M

W

(200-150)*20% of Dev Rate of that time block= 50*0.2*594.8 paisa/unit 20

0-25

0MW

(250-200)*40% of Dev Rate of that time block= 50*0.4*594.8 paisa/unit

Abov

e 25

0MW (110-50-

50)*100% of Dev Rate of that time block= 10*1*594.8 paisa/unit


In a time block: Sch Drawal = -400MW Act Drawal= -485MW Deviation = -485-(-400)= -85MWFreq = 49.86 Hz, Dev Rate = 469.76 paisa/unit Min ( 12% of Sch=48MW, 150MW) = 48MW Total overdrawal allowed without levy of Addl Charge for Deviation = 48MWQuantum of Overdrawal on which Addl Charges for Deviation to be levied = 85-48 = 37 MW

12-1

5%

3% of Sch*20% of Dev Rate of that time block= 12*0.2*469.76 paisa/unit 1

5-20

%5% of Sch*40% of Dev Rate of that time block= 20*0.4*469.76 paisa/unit Ab

ove

20 % (37-8% of

Sch)*100% of Dev Rate of that time block= 5*1*469.76 paisa/unit


300

350

400

450

Existing UI Rate (paise/unit)

Maximum UI Rate= 421.5 p/u

Thermal Stations regulated by CERC and using coalunder APM as fuel):

0

50

100

150

200

250

300

50.3

50.2

650

.22

50.1

850

.14

50.1

50.0

650

.02

49.9

849

.94

49.9

49.8

649

.82

49.7

849

.74

49.7

49.6

649

.62

49.5

849

.54

49.5

Existing UI Rate (paise/unit)165 p/u at 50Hz


200

250

300

350

Rate for Deviation Charge ( paise/unit )Maximum Deviation Rate= 303.04 paise/unit

Thermal Stations regulated by CERC and using coal under APM as fuel:

0

50

100

150

200

50.2

50.1

5

50.1

50.0

5 50

49.9

5

49.9

49.8

5

49.8

49.7

5

49.7

49.6

5

49.6

49.5

5

Rate for Deviation Charge ( paise/unit )

178 paise/unit at 50 Hz


Thermal Stations regulated by CERC and using coal under APM as fuel:

1. 105% time block capping and 101% day capping w.r.t DC of ISGS has been done away with

2. Overinjection:

Charges for Deviation receivable for overinjection in a time block within the volume capping of 12% of Schedule or block within the volume capping of 12% of Schedule or 150MW whichever is less in normal Deviation Charge subject to a capping of 303.04p/u depending on freq.

For any overinjection beyond the volume capping limit in a time block, the charges receivable is zero.

Additional Charges for Deviation for overinjection in any time block when f>=50.10Hz at 178 p/u


3. Underinjection:A. Charges for Deviation payable for underinjection

in a time block in normal Deviation Charge subject to a capping of 303.04p/u depending on freq.

B. Additional charges for Deviation levied for underinjection beyond the volume capping limit as follows:as follows:

Freq ---- 49.7 Hz and abovea. 12% of Sch in a time block < = 150 MW

Underinjection 12-15% 15-20% Above 20%


20 % of MIN(303.04p/u , Normal Deviation Charge)




b) 12% of Sch in a time block > 150 MW

Underinjection 150-200MW 200-250MW Above 250MW





This is a new provision added to this regulation.

Freq ---- Below 49.7 Hz

Additonal Charges levied = 303.04 p/uTotal Charges = 606.08 p/u


ILLUSTRATION:

1) Overinjection

Sch Act Dev Freq Dev Rate Dev RateApplic-able

Min (12% ofCol2,150)

Dev Charge Receivable


1 1450 1480 30 49.9 407.24 303.04 150 30*303.04 0

2 1450 1680 230 50 178 178 150 150*178 0

3 1200 1380 180 49.96 261.36 261.36 144 144*261.36 0

4 1300 1350 50 50.12 0 178 0 50*178


Sch Act Dev Freq Dev Rate Dev RateApplic-able

Min (12% ofCol2,150)

Dev Charge Payable


1 1450 1420 -30 49.9 407.24 303.04 150 30*303.04 0

2 1450 1280 -170 50 178 178 150 170*178 20*.2*178

3 1450 1240 -210 49.96 261.36 261.36 150 210*261.36 50*0.2*261.36+10*0.4*261.36

4 1450 1190 -260 49.8 594.8 303.04 150 260*303.04 50*0.2*303.04+50*0.4

UNDERINJECTION

4 1450 1190 -260 49.8 594.8 303.04 150 260*303.04 50*0.2*303.04+50*0.4*303.04+10*303.04

5 1180 1150 -30 49.75 678.16 303.04 141.6 30*303.04 0

6 1180 1000 -180 49.98 219.68 219.68 141.6 180*219.68 35.4*0.2*219.68+3*0.4*219.68

7 1180 940 -240 49.88 428.08 303.04 141.6 240*303.04 35.4*0.2*303.04+59*0.4*303.04+4*303.04

8 1180 1075 -105 49.70 803.2 303.04 141.6 105*303.04 0

9 1180 1075 -105 49.69 824.04 303.04 141.6 105*303.04 105*303.04


In a time block: Sch injection = 1450MW Act injection= 1190MWDeviation =1190-1450 = -260MW Freq = 49.8 Hz, Dev Rate = 594.80 paise/unit Dev Rate applicable = MIN( Normal Dev Rate, 303.04)=303.04 paise/unitMin ( 12% of Sch=174MW, 150MW) = 150MW Total underinj allowed without levy of Addl Charge for Deviation = 150MWQuantum of Underinjection on which Addl Charges for Deviation to be levied = 260-150 = 110 MW

150-

200M

W

(200-150)*20% of MIN(Normal Dev Rate of that time block,303.04)= 50*0.2*303.04paisa/unit 20

0-25

0MW

(250-200)*40% of MIN(Normal Dev Rate of that time block,303.04)= 50*0.4*303.04paisa/unit Ab

ove

250M

W (110-50-50)*100% of MIN(Normal Dev Rate of that time block,303.04)= 10*1*303.04paisa/unit


In a time block: Sch injection = 1180MW Act injection= 940MWDeviation = 940-1180 = -240MW Freq = 49.88 Hz, Dev Rate = 428.08 paisa/unit Dev Rate applicable = MIN( Normal Dev Rate, 303.04)=303.04 paise/unitMin ( 12% of Sch=141.6MW, 150MW) = 141.6MW Total underinj allowed without levy of Addl Charge for Deviation = 141.6MWQuantum of Underinjection on which Addl Charges for Deviation to be levied = 240-141.6 = 98.4 MW

12-1

5%

3% of Sch*20% MIN(Normal Dev Rate of that time block,303.04)= 35.4*0.2*303.04 paisa/unit

15-2

0%5% of Sch*40% MIN(Normal Dev Rate of that time block,303.04)= 59*0.4*303.04 paisa/unit Ab

ove

20 %

(98.4-8%of Sch)*100% MIN(Normal Dev Rate of that time block,303.04)= 4*1*303.04 paisa/unit


Infirm power:

1. Injection:

Period of 6 months allowed Domestic coal/lignite/hydro: 178p/u against 165 p/u Imported coal: 303p/u against 330p/u Exemption from volume limit

2. Drawal:

Exemption from volume limit for f>=49.7Hz No levy of Additional charges for deviation at f

Accounting of Charges for Deviation:

RLDCs to furnish data by every Thursday RPCs to prepare and issue statement of

Deviation including Additional Charges forDeviation by every Tuesday for 7 day periodDeviation by every Tuesday for 7 day periodending on penultimate Sunday.

All payments including interest , if any, to becredited to Regional Deviation Pool AccountFund

Fund to be operated and maintained by RLDCs


Other Important Clauses: Any Additional Charge for Deviation collected from a

regional entity shall be retained in the RegionalDeviation Pool Account Fund of the concerned regionwhere the regional entity is located

In the event of sustained deviation from schedule inone direction (positive or negative) by any regionalentity, such regional entity (buyer or seller) shall haveentity, such regional entity (buyer or seller) shall haveto make sign of their deviation from schedule changed,at least once, after every 12 time blocks. To illustrate, ifa regional entity has positive deviation from schedulefrom 07.30 hrs to 10.30 hrs, sign of its deviation fromschedule shall be changed in the 13th time block i.e.10.30 to 10.45 hrs from positive to negative or negativeto positive as the case may be.


Other Important Clauses: (contd.) RLDCs shall, on monthly basis, prepare and publish on

its website the records of the DeviationAccounts, specifying the quantum of over-drawl/under-injection and corresponding amount of Chargesfor Deviation payable/receivable for each buyer andseller for all the time-blocks when grid frequency was"49.90Hz and above" and "below 49.90" Hz separately.

Any surplus amount in the Deviation Pool Account Fund Any surplus amount in the Deviation Pool Account Fundon the last day of the month shall be transferred toPSDF in first week of the next month

On commencement of these regulations:a) CERC (UI & related matters) regulation shall stand

repealedb) Regional UI Pool Account Fund shall continue to

operate till the UI Accounts settlement is completed2/11/2014 24ERPC, KOLKATA

Schedule of Payments: Payment to be made within 10 days of issue of statement by RPC For delay of more than 2 days i.e beyond 12 days of issue of statement by

RPC, simple interest @ 0.04% to be levied for each day of delay Payments to receivable entities to be made within 2 working days of

receipt of payments in the fund In the event of delay of payment by Payable entities, the receivable entities

shall be paid from the balance in the fund. If sufficient fund notthere, payment to be made on pro rata basis

Utilities defaulting at any time in previous FY shall open an LC equal to110% of its average payable weekly liability in favour of the concerned

Utilities defaulting at any time in previous FY shall open an LC equal to110% of its average payable weekly liability in favour of the concernedRLDC within a fortnight of date these regulations come into force

Utilities defaulting at any time in current FY shall open an LC equal to 110%of its weekly outstanding liability in favour of the concerned RLDC within afortnight from the due date of payment

LC to be increased to 110% of the payable weekly liability for Deviation inany week during the year, if it exceeds the previous LC amount by morethan 50%

For payments not received within 12 days, RLDC entitled to encash the LCto the extent of default which has be recouped within 3 days


Relevant Clauses from IEGC , 2nd AmendmentRegulations effective from 17.02.2014

Clause 3(7)(g):RLDCs shall devise standard instantaneous message formatsin order to give directions in case of contingencies and/or threat to thesystem security to reduce deviation from schedule by the bulkconsumer, SLDC/StateUtility/ISGS/Regional Entity/Injeecting Utility atdifferent overdrawal/underdrawal/over-injection/underinjection conditionsdepending upon the severity. The concerned SLDC/other regional entityshall ensure immediate compliance with these directions of RLDC and senda compliance report to the concerned RLDC

Clause 4(1): ..The regional entities shall regulate their generationand/or consumers load so as to maintain their actual drawl from theregional grid close to the above schedule. Maximum inadvertent deviationallowed during a time block shall not exceed the limits specified in theDeviation Settlement Mechanism Regulations. Such deviations should notcause system parameters to deteriorate beyond permissible limits andshould not lead to unacceptable line loadings. Inadvertent deviations, ifany, from net drawl schedule shall be priced through the DeviationSettlement mechanism as specified by the Central Commission from time totime. Every regional entity shall ensure reversal of sign of deviation fromschedule at least once after every twelve time blocks


Relevant Clauses from IEGC , 2nd AmendmentRegulations effective from 17.02.2014 (contd)

Clause 4(2)(7): The SLDC, SEB / distribution licensee shall always restrict the netdrawl of the state from the grid within the drawl schedule keeping the deviationsfrom the schedule within the limits specified in the Deviation SettlementMechanism Regulations. The concerned SEB/distribution licensee/User, SLDC shallensure that their automatic demand management scheme mentioned in clause5.4.2 acts to ensure that there is no over-drawl. If the automatic demandmanagement scheme has not yet been commissioned, then action shall be taken asper manual demand management scheme to restrict the net drawal from grid towithin schedules and all actions for early commissioning of Automatic DemandManagement Scheme (ADMS) shall be initiated Management Scheme (ADMS) shall be initiated

Clause 4(3)(10): The ISGS is normally expected to generate power according to thedaily schedules advised to them barring any inadvertent deviations. Maximumdeviation allowed during a time block shall not exceed the limits specified in theDeviation Settlement Mechanism Regulations. Such deviations should not causesystem parameters to deteriorate beyond permissible limits and should not lead tounacceptable line loadings. Inadvertent deviations, if any, from the ex-power plantgeneration schedules shall be appropriately priced in accordance with DeviationSettlement Mechanism Regulations. In addition, deviations from schedules causingcongestion, shall also be priced in accordance with the Central Electricity RegulatoryCommission (Measure to relieve congestion in real time operation)Regulations, 2009


Relevant Clauses from IEGC , 2nd AmendmentRegulations effective from 17.02.2014 (contd) Clause 4(5)(12): .. the RLDC may direct the SLDCs/ISGS/

other regional entities to increase/decrease theirdrawal/generation in case of contingencies e.g. overloading oflines/transformers, abnormal voltages,threat to systemsecurity. Such directions shall immediately be acted upon.Incase the situation does not call for very urgent action, andIncase the situation does not call for very urgent action, andRLDC has some time for analysis, it shall be checked whetherthe situation has arisen due to deviations from schedules.

Clause 4(7)(24): "Hydro generating stations are expected torespond to grid frequency changes and inflow fluctuations.Maximum deviation allowed during a time block shall be as perthe CERC Deviation Settlement Mechanism Regulations."


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