Drivers of Ancillary ServicesinIndia
Transcript of Drivers of Ancillary ServicesinIndia
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The Need for Regulatory & Policy Framework for Ancillary Services & Alternative
Energy Options in the Indian Power Sector
Drivers of Ancillary Services
in
India
Sanjoy K. Parida
Assistant Professor
Department of Electrical Engineering
Indian Institute of Technology Patna
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Presentation Layout
• Introduction
• Ancillary services provision from DERs
• Scope to promote ancillary services in India
• Conclusion
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Introduction
Generation
Transmission
Distribution
Consumers
Ver
tica
lly i
nte
gra
ted u
tili
ty Gencos
Wholesale Competition
Transco
Discos
Retail Competition
Consumers
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Ancillary Services
• The literal meaning of the word ancillary is providing
support or help.
• Generally, the System Operator (SO) procures ancillary
services for ensuring security, reliability and quality of
the power supply to the consumers.
• Ancillary services can be provided by generators, Load
Serving Entities (LSEs) and transmission operators.
• Ancillary services are classified, procured and remunera -
ted depending upon the operational practices of the
Electricity Supply Industry (ESI).
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Classification of Ancillary Services
SRAS
Secondary FC
Primary FC
Tertiary FC
Ancillary Services
PFCAS
NCAS FCAS
VCAS
Primary VC
Secondary VC
Tertiary VC
Ref: Guide to ancillary services in the National Electricity Market, National Electricity Market Management Company.
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Frequency Control Ancillary Services
A certain amount of active power, called frequency control reserve, is kept available to perform this task.
Three levels of control are generally used to achieve FCAS: (i) Primary frequency control, (ii) Secondary frequency control and (iii) Tertiary frequency control.
Primary frequency control requires a response period of 5 to 10sec, secondary frequency control requires a response period of 10s to 15min and tertiary frequency control requires a response period of 10 to 30min.
Frequency control reserves required to perform above control tasks can be of (i) positive frequency control reserve and (ii) negative frequency control reserve.
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Network Control Ancillary Services
These are the services required to maintain the network parameters within permissible range.
VCAS are required for supporting the voltage to be maintained within the permissible limit. Three levels of control are generally used to achieve VCAS: (i) Primary voltage control, (ii) Secondary voltage control and (iii) Tertiary voltage control.
PFCAS are needed for the purpose of improving Available Transfer Capability (ATC) and the performance of real time operation considering network constraints.
System Restart Ancillary Services
These are the services related to backup capacity of the system and the capacity that is required to return the system to a normal operation after a major or partial blackout.
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Technologies Used for Provision of AS
Ancillary Services Technologies Used
FCAS Governor, AGC, Rapid unit loading, Rapid
unit unloading, Demand side
management, Distributed energy
resources (DERs)
NCAS Generators, Capacitors, Inductors,
Synchronous condensers, FACTS
controllers, Distributed energy resources
(DERs)
SRAS Generators, Distributed energy resources
(DERs)
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Procurement of Ancillary Services
Compulsory Provision
• As part of connecting conditions, a fixed amount of ancillary
services is provided.
• Consequences: (i) volume of service provided may exceed
what is actually needed, (ii) potentially low cost providers are
treated on the same basis as more expensive one.
Market Based Provision
• Bilateral contracts: (i) this form of procurement lacks
transparency, (ii) this type of negotiation can be long-term,
complex and costly, (iii) because of high transaction cost of
contracts, price and volume often remain fixed for a long
time.
• Both tendering process and creation of a spot market enhance
transparency and foster competition.
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Remuneration of Ancillary Services
Structures of Remuneration
• Availability cost
• Utilization cost
• Fixed cost
• Variable cost
• Opportunity cost
Remuneration Methods
• Regulated price
• Pay as Bid price
• Common clearing price
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RESs in Distribution Network
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Summary of renewable technology
capabilities to provide AS
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Summary of non-renewable technology
capabilities to provide AS
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Economic Analysis • Cost of Electricity Generation
It consists of three components.
• Capital cost:
Includes the cost of the plant, land acquisition, grid
connection, initial financing cost.
• Operating & Maintenance cost Includes insurance, rent, cost of labor and materials used for
operation & maintenance.
• Fuel cost
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• Cost comparison with the conventional power
generation technologies
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Optimum Economic Dispatch
• The aim is to load generating sets in response to demand changes so as to minimize the cost of supply. This is known as optimum economic dispatch (OED).
• If plant A is a nuclear plant and plant B is a coal based thermal plant, then KA
’ < KB’
• the minimum cost Cmin occurs when the plant A takes as much of the load share as possible, i.e. it is loaded to its maximum level, with plant B brought in to cover the deficit.
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• If there are ‘n’ plants available arrange the plants in order of increasing K′, the so - called merit order. Starting from the top of the list, the plants are then loaded (each up to the limit of its capacity) before the next plant on the list is brought into action.
• Units with low operating costs run preferentially and therefore attract high load factors; they generate a disproportionately large share of electricity relative to their capacity. They are called base load plants , or high merit plants.
• Units with high operating costs only run during peak demand, generate a disproportionately small share of the total electricity and are known as peaking plant.
• Plants in between these two extremes are called intermediate plants or middle merit plants.
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• The total cost of generated energy by a power station, for example a nuclear power station, may be higher than that from a coal fired one, the OED requires that the nuclear station is fully loaded because of its very low incremental cost.
• The rationale is that the loading priority is independent of the original capital sum expended in the construction of a power station. As the station is present and available it should be utilized fully because of its low running costs.
• It may be concluded that as the energy supplied by RE sources (except biomass) is characterized almost entirely by a capital cost component, their incremental cost is negligible. Therefore the OED method would require them to provide at all times all the energy they are capable of delivering.
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Scope to Promote Ancillary Services in
India
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Structure of the Indian ESI
Delhi
Punjab
Chandigarh
Rajastan
Jammu & Kashmir
Haryana
Himachal Pradesh
Uttar Pradesh
Uttaranchal
Bihar
Jharkhand
Orissa
Sikkim
West Bengal
Assam
Tripura
Meghalaya
Arunachal Pradesh
Manipur
Mizoram
Nagaland
Kerala
Karnataka
Andhra Pradesh
Tamil Nadu
Goa
Madhya Pradesh
Chhatisgarh
Maharastra
Gujarat
Indian ESI
NRG ERG NERG SRG WRG
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Operational Structure of ESI in India
Offer
RLDC (RSO)
ISGSs/ CGSs/ IPPs
Forecast Drawal. Sch.
SLDCs
State Gen.
SEBs/Discos
Availability Disp. Sch.
Traders
Traders
PXs
Bid Bid
MCV
&
MCP
NLDC (ISO)
Other
RLDCs
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Frequency Regulation Service
• The primary frequency control, which is provided by the
governor action of a generator or automatic regulation
of frequency sensitive load, is also know as frequency
regulation.
• With the transition from vertically integrated utilities to
unbundled one frequency regulation transformed to a
“service” from an “obligation”.
• In India, this service is being provided by generators
under Free Governor Mode of Operation (FGMO)
complied with certain guidelines prescribed by CERC
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FCAS from Generators
Valve
Power
- +
Incremental
Cost
Scheduled
Generation
Gain
Nominal
Frequency +
+
UI
Rate
Secondary Control Loop
Generator
Output
Actual
Frequency
Generator Power
System
Droop
Change in
Tie line
Power
Change in
Demand
Primary Control Loop
Ref: Tyagi et al. “A mathematical framework for frequency linked availability based tariff mechanism in
India” Proc. of the National Power Systems Conference, December 2004, IIT Chennai, India.
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FCAS from LSEs
UI Rate Comparison
Incremental
Cost
Captive
Generation
+
-
Demand
requirement from
CGSs/ISGSs/IPPs
Total
Demand
Grid
Frequency
Next
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Some renewable technologies are small and modular,
they can be sited in or near buildings as distributed
generation (DG) where energy is used.
It can be used as an important component in microgrid,
which is defined as localized grouping of electricity
generation, energy storage, and loads that operates
within the grid or in islanded mode if possible.
Renewables have great potential in providing Ancillary
Services (AS). AS are the system support services
required to maintain security and reliability of the system
EXPLOITATION OF RENEWABLES
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In radial mode transmission there are sources of generation at one end with a transmission and distribution system having consumers at the other end.
At the instant of failure of the generating station the whole system fail. As such there is no flexibility for the system.
In integrated system all the generating stations are connected through a reliable mesh transmission network.
Total load connected to the system is shared by all the generation stations.
Demand of electricity vary place to place. Industrial load growth generally occurs adjacent to the cities and towns.
INTEGRATED SYSTEM
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Continued….
In India because of uneven distribution of natural resources, generating stations are located in few pockets far away from load centers.
Also, some regions are surplus in generation and some regions are shortfall of generation as compared to load demand.
Surplus generation is need to be transported to energy deficit regions, which improves the power-supply reliability and quality.
Liberalization of the electricity market leads to new
management structures for the operation and control of
the electricity grid.
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I. Technical
II. Economical
III. Environmental
IV. Resource availability
INTEGRATION BASED ON
ATTRIBUTES
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Technical Economical Environmental Resource
availability
Efficiency Investment cost Noise Oil
Power generation O&M cost NOx Gas
Capacity factor Electricity Price SO2 Wind
Life time CO2 Solar
Installation led
time
CO
Start up time HC
Forced outage rate PM
Maintenance
Footprint
SUB-ATTRIBUTES
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EASTERN
REGION
DG TECHNOLOGIES WITH RESPECT TO
THE MAIN ATTRIBUTES
WESTERN
REGION
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SOUTHERN
REGION
NORTHERN
REGION
Continued….
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NORTH EASTERN
REGION
Continued….
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Conclusion
• Indian power sector, Free Governor Mode of Operation (FGMO) is the sole mechanism to provide FCAS.
• DERs are important resources for various kinds of AS.
• Design of market mechanism with proper policy framework for provision of ancillary services.
• UI may play very important role in AS provision.
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