integrating intermittent renewable energy resources tso operational challenges and solutions
Download
Skip this Video
Download Presentation
Integrating Intermittent Renewable Energy Resources:  TSO Operational Challenges and Solutions

Loading in 2 Seconds...

play fullscreen
1 / 35

Integrating Intermittent Renewable Energy Resources:  TSO Operational Challenges and Solutions - PowerPoint PPT Presentation


  • 114 Views
  • Uploaded on

Integrating Intermittent Renewable Energy Resources:  TSO Operational Challenges and Solutions. Cihangir Gençoğlu 08.03.2011, Joint Transmission System Operator – Utility Regulator Renewable Energy Workshop , Istanbul. Outline. The present Turkish Electricity Transmission System

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Integrating Intermittent Renewable Energy Resources:  TSO Operational Challenges and Solutions' - libra


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
integrating intermittent renewable energy resources tso operational challenges and solutions

Integrating Intermittent Renewable Energy Resources:  TSO Operational Challenges and Solutions

Cihangir Gençoğlu

08.03.2011,

Joint Transmission System Operator – UtilityRegulator Renewable Energy Workshop,

Istanbul

slide2

Outline

The present Turkish Electricity Transmission System

2) ENTSO-E CESA trial parallel operation and frequency control performance indices

3) The possible effects of rapid growing intermittent generation on Turkish Electricity Transmission Systema) Geographical distribution of renewable generation b) The expected challenges

4) Conclusions

slide3

Part 1

The Present Turkish Electricity

TransmissionSystem

(Before Synchronization)

slide4

Some Facts about Turkish Grid

  • ~50 GW installed capacity
  • More than 32 GW of peak demand (summer)
  • Annual increase in demand 7–8 %
  • Hydro, coal and combined cycle power plants
  • Deregulated generation sector
  • Privatized distribution sector
  • TEIAS is natural monopoly in transmission business (regulated by EMRA)
organization chart of the project
Organization Chart of the Project

Rehabilitation of the Frequency

Control Performance of TPS for

Synchronous Operation with UCTE

Survey of Power Plants

Site Tests & Studies

Design of Governor Control and

Parameter Optimization

Secondary Control

Design and Optimization of

AVR/PSS

Special Protection Scheme

Restoration Plan

Training

slide7

Preliminary Studies

  • Site Survey
    • Power Plant Dynamical Data
      • Generator Parameters
      • AVR, PSS, Speed Governor Models and Parameters
      • Reliability of the data is very important!!!
  • Identification of the Problems
    • Very Low Frequency Periodical Frequency Oscillations
    • (b/w 20-30 sec, depending on the state of the system)
      • Governor Rehabilitation and Retuning Studies (mostly concentrated on HPPs)
    • Poor Quality of Frequency Control
      • Coordination with PPs, Balancing & Settlement Market
    • Expected Low Frequency Inter Area Oscillations (caused by static excitation systems and longitidunal structure of the system)
      • PSS Rehabilitation and Retuning Studies
      • Innovative Measures
slide8

Periodical Frequency Oscillations

  • Major HPPs out of Service
slide10

Basic Problem (Challenging !!!)

  • Periodical frequency oscillations have been resolved by rehabilitation of Ataturk & Karakaya HPPs.
  • According to the simulation studies, the expected inter area mode after interconnection of Turkey is ~0.15Hz.
  • ~0.15Hz oscillations are inside the control bandwidth of:
    • PSSs
    • Governors
  • Conclusion: The speed governing structures of power plants (Governors and Turbines) should not contribute to inter area power swings of ~0.15Hz.
slide11

Primary Frequency Control – TPPs & NGCCPPs

  • TPPs
    • Site specific problems
      • Quality of coal
      • Old power plants (rehabilitation !!!)
    • Boiler follows turbine !!!
    • Pressure control !!!
  • NGCCPPs
    • No problems as far as there is sufficient reserve for all conditions
      • Base load ~ f(temperature, pressure, humidity)
    • Temperature control !!!
  • HPPs
    • Designed according to the site specific geographic conditions
    • High nonlinearity
    • Every HPP is a small kingdom having its own rules 
slide12

Part 2

ENTSO-E CESA Trial Parallel Operation and Frequency Control Performance Indices

(After Synchronization)

slide13

Inter Area Oscillations – After Interconnection

  • Mode shape after the interconnection of
  • Turkish Power System to ENTSO-E CESA system.
slide15

Stability Related Issues

  • Low frequency modes (~0.15 Hz) are present in the system!!!
slide16

Dynamic Stability - Solution Methodology

  • Road map for enhancing the steady state stability of the interconnected system
slide17

Interconnected System Frequency

  • δf ~ 25 mHz
  • faverage ~ 50.001 Hz
  • Total 30 sec reserve (i.e., primary reserve) of the CESA system including Turkey is ~3000 MW
  • Turkey as a control area provides ~300 MW of this reserve
slide18

Performance Indices

  • The hourly integral of ACE should not exceed ±60 MWhrs
    • To limit unintended energy exchanges
  • Number of cases with ACE > ±175 MW (measured per 2 seconds, evaluated per 4 seconds) over an hour should not exceed 10% of the cases in normal operation
    • To prevent overloads in the electricity transmission systems of the neighboring Balkan countries
  • The amount of sum of tie line flows due to inter area oscillations should not exceed 30 MWs in normal operation
    • To prevent overloads due to inter area power oscillations in the CESA countries
slide19

Frequency Control Problems

  • High standard deviation of ACE due to
    • Intermittent loads
    • Hourly load variations up to 2500 MW/hr (annual peak load is ~32000 MW)
    • Balancing and settlement market problems (mostly related to market regulations)
    • IT infrastructure of TEIAS
  • Solution
    • Effective management of tertiary reserve (long term, not possible with the current market regulations)
    • Increased amount of secondary reserve under the influence of the AGC system (short term) for certain periods of the day.
slide23

Present State

  • Frequency Stability (1&2)
  • Rotor Angle Stability (3)
  • Operational Issues
    • On progress
slide24

Part 3

The Possible Effects of Rapid Growing Intermittent Generation on Turkish Electricity Transmission System

current situation in turkey
Current Situation in Turkey

Incentive mechanism for renewable generation

TechnologyFirst 10 years of operation ($cent/kWh)

Hydro 7.3

Wind 7.3

Geothermal 10.5

Solar13.3

Biomass (incl. LFG)13.3

90 % discount in system usage tariff & 99% discount in license fees

Extra incentives in the case of usage of domestic equipment

Technical previleges (ancillary services & market regulations)

Priority in system interconnection

Land usage incentives

For further details see Turkish Law #6094

slide27

Characteristics of Wind Generation

Characteristics of Wind Generation

slide33

The Expected Challenges

  • Increased standard deviation of ACE due to
    • Intermittent generation in short term (turbulent peaks/dips)
    • Balancing and settlement market problems due to bad prediction of renewable generation capacity in long term
    • IT infrastructure of TEIAS
      • Special monitoring/control system requirement especially for wind power
  • Solution
    • Effective management of tertiary reserve (current market regulations do not encourage generation curtailment)
    • Increased amount of secondary reserve under the influence of the AGC system (short term) for the entire day.
slide34

Part 4

Conclusions

slide35

Conclusions

  • The frequency stability of TETS has been drastically enhanced with the ENTSO-E CESA Interconnection
  • Intermittent generation characteristics in short term, together with balancing and settlement market problems due to the stochastic nature of renewable resources will definitely have adverse effects on this issue.
  • Possible solution:
    • Effective management of tertiary reserve (current market regulations do not encourage generation curtailment)
    • Increased amount of secondary reserve under the influence of the AGC system (short term) for the entire day.
    • Monitoring and control infrastructure investments (both hardware and software)
ad