Renewable Generation Hosting Capacity Screening Tool...
Transcript of Renewable Generation Hosting Capacity Screening Tool...
© 2015 Electric Power Research Institute, Inc. All rights reserved.
Renewable Generation Hosting Capacity
Screening Tool for a Transmission Network
Vikas Singhvi Deepak Ramasubramanian
1st International Conference on Large-Scale Integration of Renewable Energy in
India
New Delhi 6-8th September, 2017
2 © 2015 Electric Power Research Institute, Inc. All rights reserved.
Renewable Generation/DER Hosting Capacity Tool for a Transmission Network
Goal : Develop a automated tool/engine for transmission system – Provides maximum renewable
generation/DER a transmission region can host without any network upgrades
– High-level screening tool
Disclaimer – The tool is not intended to replace detail
feasibility and system impact studies which are imperative to make to any investment decisions
The tool will help planners :
• To screen through multiple interconnection requests allowing for a better understanding of where and how much new generation resources would impact the system
• To identify optimal versus non-optimal locations of future renewable generation/DER deployments such that grid updates can be minimized
Tool: Framework
Input
Analysis
Criteria
Phase 1
Generation Dispatch
Load Levels
Injection Nodes
Network Conditions
Power Flow Analysis
Simple Short Circuit Analysis
Thermal Limtis Voltage LimitsShort-circuit Ratio(SCR)
Stability Analysis
(Small-signal and Transient)
Stability Limits
Renewable Temporal Variations
Renewable Functional Controls
Any Limit Violated
As-is Renewable Hosting Capacity of the Zone/Region/Area
Phase 2
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Tool Design: Overview
Study Case Developement Layer
- Compilation of user inputs
- Development of Power Flow test cases
- Building a case repository
Analysis Layer
- Power flow studies
- Short circuit calculations
- Limit violation assessments (voltage limits, line thermal limits, and short circuit ratio)
Output Compilation Layer
- Compiles analysis results for each of the test cases
- Enables capabilities such as post-processing of analysis results, visualizations, report/log creation
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Flow Diagram: Case Definition Layer
• For example; with 2 load levels, 10 contingencies and 2 location sets of renewable, the total number of generated cases will be (2x10x2) = 40
• Also, 4 cases will be generated by adding renewables/ DERs in the 2 load at the 2 specified location sets, making the total number of cases 44 in the process.
Start
Base cases to include in the study
(PSSE power flow .sav files)
User Input
PSSE Working Power Flow Case
Implementation of Critical Network Contingency Set
Incremental sav cases generated using ACCC (*con file)
User Input
Add Wind/PV/DER (Initialize with 0
MW)
Model parameters for Wind/ PV/DERs
User Input
POI Locatios [ .xlsx / .xls files ]
User Input
Generated .sav Cases
Provided by utility or developed using Production-cost
model
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Flow Diagram: Analysis Layer Generated power flow cases from Case Definition Layer
PSSE Working Case
Power Flow Converged?
Subroutine: attempt to make
the case converge
Limits Violated?
Previous penetration level is set as the maximum hosting capacity
for the current working case
All cases analyzed?
Stop / Exit
Update Case Identifier
Run Power Flow and Check Convergence
• Conventional Generation Re-dispatch
• Short-Circuit Calculations and Short-Circuit Ratio (SCR) Limit Check
• Increment Renewable and DER generations
Power Flow Converged?
Skip the case
Bus Voltage and Line Thermal Limit Check
Yes
Yes
Yes
No
No
No
No
Yes
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Implementation of the Short-Circuit Limit Assessment Block
• SCMVA = short-circuit MVA contributed by the synchronous generator
• SCRlimit = 10 (or any user defined value )
• PRated = Rated MW of the Renewable or DER Plant to be connected
Condition:
Implement Conventional Generation Re-dispatch based on the re-dispatch scheme (without solving PF)
Calculate Short Circuit MVA at the candidate buses
Rank the candidate POI buses according to their SCMVA
Define total increment in Renewable / DER generations and allocate the increment among the candidate buses based
on their SCMVA ranking
Condition check?
Calculate SCR
Implement generation increment PSSE power flow case
𝑆𝑆𝑆𝑆𝑀𝑀𝑀𝑀𝑀𝑀𝑆𝑆𝑆𝑆𝑆𝑆𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙
> 𝑃𝑃𝑅𝑅𝑅𝑅𝑙𝑙𝑅𝑅𝑅𝑅 Re-allocate the excess generations at constrained buses in accordance with
the bus rankings based on SCMVA
Re-allocation successful?
STOP: • Calculate the amount that couldn’t be re-allocated. • Adjust re-dispatch by that amount • Set the current amount of penetration as the MAX for this case
NOT Satisfied
Satisfied
NO
YES
Power Flow convergence, voltage and line thermal limit check
8 © 2015 Electric Power Research Institute, Inc. All rights reserved.
Tool Implementation: Overview of the GUI
Hosting Capacity v/s region, re-dispatch,etc….
Tool Main Window
9 © 2015 Electric Power Research Institute, Inc. All rights reserved.
Tool Implementation: Overview of the GUI Tool Main Window
10 © 2015 Electric Power Research Institute, Inc. All rights reserved.
Tool Output : Sample Results
Maximum Penetration Level across Multiple Contingency Cases
Maximum Penetration Level Split up by Type of Generation Resource
Branch Flow Violations v/s Generation Level
Voltage magnitude Violations v/s Generation Level
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Data Requirements
Common data for all types of screening studies: – Transmission planning model ( Peak, off-peak, etc) – Contingency list (.con file) and .sub/.mon files – Thermal/Voltage criteria
Data for renewable generation/DER limit assessment : – Potential buses for future renewable generation and DER
deployments in a region – Generator re-dispatch scheme(s) priority order
12 © 2015 Electric Power Research Institute, Inc. All rights reserved.
Next Steps Test and validate the tool across multiple utility cases
Develop additional automated screening capabilities :
– Impact/limits on generation retirement/new generation injection (Eg. Gas)
– Impact/limits on increase in load withdrawal
Explore feasibility of adding other criteria : Small signal stability Transient Stability FIDVR
13 © 2015 Electric Power Research Institute, Inc. All rights reserved.
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