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Southern Regional Power Committee, Bengaluru Minutes of the Meeting on implementation of AGC in SR states
held on 19.09.2018 at SRPC, Bengaluru
1. Introduction A Meeting on implementation of AGC in SR states was held on 19th September 2018
at SRPC, Bengaluru. Representatives from APGENCO, KPTCL, KPCL, PCKL, KSEBL,
TANTRANSCO, TANGEDCO, TSTRANSCO, TSGENCO, NTPC, NLC, M/s Siemens,
M/s PRDC, NLDC, SRLDC and SRPC participated in this meeting. The list of
participants is given at Annexure-I.
In the 34th SRPC meeting held on 11.08.2018, it was agreed that (as noted in
28.03.2018 meeting on AGC), Pilot Project on AGC would be implemented in all the
states. States could approach the State Regulators and commence the Pilot Project.
In the SRPC meeting, it had also been agreed that a Committee with participation
from State SLDCs, GENCOs, SRLDC and NLDC would be formed to facilitate Pilot
Project implementation in the states.
In this regard it is pertinent to note that Hon’ble CERC vide Order dated 13.10.2015
on Petition No. 11/SM/2015 had directed as follows:
(b) The Commission reiterates the need for mandating Primary Reserves as well as Automatic Generation Control (AGC) for enabling Secondary Reserves.
(i) All generating stations that are regional entities must plan to operationalized AGC along with reliable telemetry and communication by 1st April, 2017.
(iii) The Central Commission advises the State Commissions to issue orders for intra-state generators in line with this timeline as AGC is essential for reliable operation of India’s large inter-connected grid.
Shri S R Bhat, Member Secretary, SRPC welcomed all the participants to the
meeting. He specially welcomed Shri N Nallarasan, DGM NLDC and noted that
NLDC was pioneering the AGC implementation which was worth noting. He stated
that the requirement of AGC has been well appreciated by all the stake holders. It
was apt time now to implement AGC in the states, the roadmap of which had
already been identified by Hon’ble CERC. M/s PRDC, M/s Siemens, NLDC, NTPC-
Simhadri, KPCL and KPTCL were present in this meeting to share their experience
on AGC implementation.
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2. The following was deliberated in the meeting: NLDC For Simhadri-NTPC Pilot project of AGC, the hardware had been delivered and
integration was being taken up. By end of September 2018/1st week of October 2018, the Pilot project of AGC was expected to take off.
NTPC-Dadri AGC Pilot project was successfully operating w.e.f. 04.01.2018. The Architecture diagram is given below:
Desired control logical unit (CLU/RTU) specification based on the experience of
the first Automatic Generation Control (AGC) Pilot Project are given below: The following signals were taken through the RTU/PLC/SAS controller for each unit.
A). Analog Input data from CLU per generating unit
1. Unit Load Set Point – Analog input 2. Actual Generation – Analog input 3. Participation Factor – Analog input 4. Unit Capability – Analog input 5. RGMO block input to governor – Analog input
B). Digital Input data from CLU per generating unit
1. Circuit Breaker Status on/off – Digital input 2. RGMO status on/off– Digital input 3. AGC Local/Remote– Digital input
C). Analog output data to CLU per generating unit through AGC server at NLDC
1. Delta P – Analog Output per unit
Technical Specification of control logical unit (CLU/RTU) and other associated hardware /cabling requirement are given at Annexure-II.
LOA for NTPC-Mouda AGC Pilot project had been placed while tendering activities were being taken up for NTPC-Bongaigaon and NTPC-Barh.
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For NP Kunta AGC Pilot project, they were in touch with AP, NTPC etc to come out with some compensation mechanism. Technically it had been assessed and concluded that the project was possible. PRDC presented the block diagram and the time schedules for the AGC at NP Kunta (Annexure-III). The test run was expected in March 2019.
APSLDC / APTRANSCO had shown interest in AGC implementation in a comprehensive manner in the state.
In Western region, Madhya Pradesh was moving ahead on AGC implementation.
M/s Siemens presented the overall set up of the AGC at Dadri (Annexure-IV). Their scope included setting up AGC (SCADA/AGC) system, establishing ICCP with SCADA/EMS system, receiving all required real-time data for SCADA/EMS system over ICCP, supply and commissioning of RTU at Generation Plant and developing a logic at RTU end to derive unit-wise set point from plant set point received from AGC.
SRLDC ED, SRLDC stated that non implementation of LVRT, RGMO, AGC and other
grid related requirements were sure recipe for another major grid disturbance even if there was system/transmission/protection adequacy. He earnestly requested all the stake holders to implement these grid requirements since grid operation was getting complex day by day.
SRPC On a query of SRPC about computing the ACE/communicating AGC signal
every two seconds, it was informed that the same is being carried out to capture all events and in multi generators providing AGC services the optimal/economic despatch scenario could be implemented. As there would be delay in response from thermal units (say around 1 minute) the ACE and AGC are appropriately coordinated through proper logic and feedback loop.
The references on the subject / discussions are given at Annexure-V. AP On a query by Sri Damodaram Sanjeevaiah TPS (Krishnapatnam) about the
AGC requirement violating the operation limits, it was clarified that limits are defined by generator itself and even in real time operating limit signal is communicated to AGC software at Control Centre (SLDC) and the AGC requirement would be considering these factors.
SRPC informed that in the 33rd TCC meeting, it was informed by APSLDC that APGENCO was willing to take up AGC in a comprehensive manner.
APGENCO stated that in discussion with APSLDC, they would communicate the units for AGC Pilot project implementation by 30.09.2018.
TSTRANSCO/TSGENCO
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TSTRANSCO/TSGENCO informed that they had initial deliberation (at Director level) on the issue and they were in principle agreeing for AGC Pilot project implementation.
TSGENCO informed that it had been agreed to visit NTPC-Dadri (or NTPC-Simhadri) to comprehend the AGC implementation at the generating station. NTPC / NLDC assured of the necessary assistance in this regard. It may take around 2-3 weeks time after the visit to identify the units for AGC Pilot project implementation.
MS, SRPC suggested that the visit could be planned within next week and the confirmation can be communicated by 30.09.2018. He pointed out that there appeared little progress in number of states on AGC implementation though there was CERC Order in this regard. If required, a special TCC meeting would be called.
KPTCL/KPCL KPCL informed that AGC implementation was under progress at Sharavathy
and Varahi. The OEMs M/s ABB and M/s Andritz would be taking up integration works at the generating stations. The AGC implementation at 10 MW Solar at Sivasamudram had also been agreed. Further, based on experience, AGC at Yeramarus TPS and Bellary TPS would be considered.
KPTCL informed that their SCADA was having the AGC module and more than 100 units could be configured through it.
PRDC presented the block diagram of AGC as given below:
The Technical requirements at plant are given below:
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PRDC presented the Karnataka ACE and stated with AGC reserve of around 300-400 MW the majority of the deviations would have been curtailed (Annexure-VI). Further, world wide it has been seen that with a reserve of around 3% the ACE could be controlled. If AGC is wired for number of units the contribution from individual unit becomes very small.
PRDC informed that Tenders were published in June 2018 and bids were received in August 2018.
At Varahi the installed capacity was 460 MW (4 x 115), the AGC control mode was at plant level, AGC signal frequency was every 4 seconds and 100 MW control was envisaged (Status block diagram given at Annexure-VII).
At Sharavathy ,the installed capacity was 1,035 MW (10 x 103.5), the AGC control mode was at plant level, AGC signal frequency was every 4 seconds and 100 MW control was envisaged (Status block diagram given at Annexure-VIII).
At Sivasamudram the solar installed capacity was 10 MW, the AGC control mode was at plant level, AGC signal frequency was every 4 seconds and 1 MW control was envisaged (Status block diagram given at Annexure-IX).
The plan of action is given below: Issue of orders to respective venders to provide the facilities at Varahi, Sharavathy and 10 MW solar plants - Sep-Oct 2018 Completion of AGC facilities at plant locations by vendors - Jan 2019 Test Run of AGC in Karnataka - Jan/Feb 2019 KERC regulations for compensation for participation of solar generation unit, if required - Jan to March 2019
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Execution of AGC - March 2019 to Aug 2019 Analysis of Results and recommendations for compensation mechanism for secondary reserves to regulators - Sep 2019
Pilot implementation process, implementation timelines and case study is given at Annexure-X.
It was noted that the AGC signal would be transmitted also on VSAT.
KSEBL KSEBL informed that AGC at Kuttiadi and Idukki would be taken up. There
were SCADA upgradation (Unit-4, 5 & 6) and OFC laying at Kuttiadi and the same may take around 3 months to complete the activities. There were some RMU activities and some communication upgradation (OFC) being taken up at Idukki and it may take 10 months to complete the activity. The AGC Pilot project was being contemplated at Kuttiadi, followed at Idukki.
It was noted that OFC was a desirable requirement but not a necessary requirement. It was suggested that KSEBL could commence AGC Pilot project implementation both at generator and at SLDCs and in the meantime the identified activities would also be completed.
SRLDC stated that they would take up the issue of expediting the OFC connectivity to Kuttiadi and Idukki on priority.
TANTRANSCO/TANGEDCO TANGEDCO informed that units at Mettur stage-III and North Chennai stage-II
may be identified but the confirmation would be communicated after management approval.
TANTRANSCO stated that AGC was required and works at SLDC would be initiated.
NTPC-Simhadri NTPC-Simhadri informed that the signal testing with NLDC had been
completed. The project is targeted to be completed by 24.09.2018 (Time schedule of various activities are given at Annexure-XI). The project may be operationalized from 01.10.2018.
The Architecture of AGC is given below:
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Data flow in the project is given below:
The logic block diagram is given below:
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The signal interfaced are given below:
The project had cost around Rs 31 lakhs at their end. Other OFC
implementation had cost around Rs 60 thousand. They did not face any issues in the implementation of the project. The
commercial aspects are given at Annexure-XII. 3. Recommendations
AP, TS & TN to confirm the units for AGC Pilot Project by 30.09.2018. SLDCs and the GENCOs to coordinate and firm up the requirements for AGC
implementation and the scope of works at their ends. SLDCs/GENCOs to appraise the SERCs on the Pilot Project implementation.
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It was noted that KPTCL and KSEBL proposals had not been accepted for AGC component for PSDF funding. Hence, all states / GENCOs may need to take up the works with their own funds.
4. Conclusion MS, SRPC thanked the participants for their active deliberations and hoped that implementation of the AGC Pilot Projects in the states would be expedited.
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