Integrating intermittent renewable energy resources tso operational challenges and solutions
This presentation is the property of its rightful owner.
Sponsored Links
1 / 35

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


  • 76 Views
  • Uploaded on
  • Presentation posted in: General

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

Download Presentation

Integrating Intermittent Renewable Energy Resources:  TSO Operational Challenges and Solutions

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


Integrating intermittent renewable energy resources tso operational challenges and solutions

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 generationb) The expected challenges

4)Conclusions


Integrating intermittent renewable energy resources tso operational challenges and solutions

Part 1

The Present Turkish Electricity

TransmissionSystem

(Before Synchronization)


Integrating intermittent renewable energy resources tso operational challenges and solutions

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)


Integrating intermittent renewable energy resources tso operational challenges and solutions

CESA System


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


Integrating intermittent renewable energy resources tso operational challenges and solutions

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


Integrating intermittent renewable energy resources tso operational challenges and solutions

Periodical Frequency Oscillations

  • Major HPPs out of Service


Integrating intermittent renewable energy resources tso operational challenges and solutions

Periodical Frequency Oscillations

  • Major HPPs in Service


Integrating intermittent renewable energy resources tso operational challenges and solutions

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.


Integrating intermittent renewable energy resources tso operational challenges and solutions

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 


Integrating intermittent renewable energy resources tso operational challenges and solutions

Part 2

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

(After Synchronization)


Integrating intermittent renewable energy resources tso operational challenges and solutions

Inter Area Oscillations – After Interconnection

  • Mode shape after the interconnection of

  • Turkish Power System to ENTSO-E CESA system.


Integrating intermittent renewable energy resources tso operational challenges and solutions

Simulation Studies - Time Domain Analysis


Integrating intermittent renewable energy resources tso operational challenges and solutions

Stability Related Issues

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


Integrating intermittent renewable energy resources tso operational challenges and solutions

Dynamic Stability - Solution Methodology

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


Integrating intermittent renewable energy resources tso operational challenges and solutions

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


Integrating intermittent renewable energy resources tso operational challenges and solutions

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


Integrating intermittent renewable energy resources tso operational challenges and solutions

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.


Integrating intermittent renewable energy resources tso operational challenges and solutions

Frequency Control Problems


Integrating intermittent renewable energy resources tso operational challenges and solutions

Frequency Control Problems


Integrating intermittent renewable energy resources tso operational challenges and solutions

Frequency Control Problems


Integrating intermittent renewable energy resources tso operational challenges and solutions

Present State

  • Frequency Stability (1&2)

  • Rotor Angle Stability (3)

  • Operational Issues

    • On progress


Integrating intermittent renewable energy resources tso operational challenges and solutions

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)

Hydro7.3

Wind7.3

Geothermal10.5

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


Integrating intermittent renewable energy resources tso operational challenges and solutions

Characteristics of Wind Generation


Integrating intermittent renewable energy resources tso operational challenges and solutions

Characteristics of Wind Generation

Characteristics of Wind Generation


Integrating intermittent renewable energy resources tso operational challenges and solutions

Geographical Distribution of Renewable Generation


Integrating intermittent renewable energy resources tso operational challenges and solutions

Geographical Distribution of Renewable Generation


Integrating intermittent renewable energy resources tso operational challenges and solutions

Geographical Distribution of Renewable Generation


Integrating intermittent renewable energy resources tso operational challenges and solutions

Geographical Distribution of Renewable Generation


Integrating intermittent renewable energy resources tso operational challenges and solutions

Geographical Distribution of Renewable Generation


Integrating intermittent renewable energy resources tso operational challenges and solutions

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.


Integrating intermittent renewable energy resources tso operational challenges and solutions

Part 4

Conclusions


Integrating intermittent renewable energy resources tso operational challenges and solutions

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)


  • Login