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Sample-Based Power Flow Approximations: Computational Methods, Analysis, and Applications
Sample-Based Power Flow Approximations: Computational Methods, Analysis, and Applications
Sample-Based Power Flow Approximations: Computational Methods, Analysis, and Applications

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260209102905
ISBN  
9798263394677
DDC  
343.09
저자명  
Buason, Paprapee.
서명/저자  
Sample-Based Power Flow Approximations: Computational Methods, Analysis, and Applications
발행사항  
[Sl] : Georgia Institute of Technology, 2023
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2023
형태사항  
142 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
주기사항  
Advisor: Molzahn, Daniel K.
학위논문주기  
Thesis (Ph.D.)--Georgia Institute of Technology, 2023.
초록/해제  
요약The non-convex nature of the power flow equations poses a challenge for solving various power system optimization and control problems. To address these challenges, linear approximations are often employed. However, the accuracy of these linearizations can vary depending on the specific characteristics of the power system and the operational range in which they are applied. Existing linearizations typically rely on general assumptions that apply to broad classes of systems, which can limit their accuracy and result in constraint violations when applied to specific systems.In contrast to these existing approaches, we introduce conservative linear approximations of the power flow equations. These conservative linearizations intentionally overestimate or underestimate quantities of interest, aiming to make algorithms more tractable while avoiding constraint violations. We compute these conservative linear approximations through a sample-based method, involving the solution of a constrained linear regression problem.Additionally, we introduce a class of approximations based on rational functions with linear numerators and denominators. This choice is motivated by the resulting linear inequality constraints, making these approximations well-suited for optimization formulations, while still providing enhanced accuracy compared to linear functions.We enhance the conservativeness and accuracy of our approximations through an iterative sampling method, optimizing these functions with respect to the relevant quantities. We also conduct a sample-complexity analysis. To further develop our approach, we establish an importance sampling method for constructing linear and conservative linear approximations. This method's objective is to efficiently improve approximation quality by selecting the most informative samples. It does so by drawing samples from a relatively low-dimensional subspace exhibiting high curvature. This approach allows us to obtain highly accurate linear approximations with significantly fewer samples than random selection. By examining the relationships between the voltage magnitudes and the active and reactive power injections, we characterize the performance of our proposed power flow approximations for a range of test cases.Furthermore, we examine applications of conservative linear approximations to prove their effectiveness in an optimal sensor placement problem that we formulate as a bilevel program. In the optimal sensor placement problem, our goal is to place a minimal number of sensors and avoid false sensor alarms in the upper level while the lower level ensures that these sensors will detect any voltage violations. We replace the nonlinear power flow equations with conservative linear approximations to make the bilevel problem tractable. With conservative linear approximations, we can ensure that the resulting sensor locations and thresholds are sufficient to identify any constraint violations. Additionally, we apply various problem reformulations to significantly improve computational tractability while simultaneously ensuring an appropriate placement of sensors. Lastly, we improve the quality of the results via an approximate gradient descent method that adjusts the sensor thresholds. We demonstrate the effectiveness of our proposed method for several test cases, including a system with multiple switching configurations.Numerical tests demonstrate that our power flow approximations enhance accuracy compared to other linear approximations and prove effective in optimization problems. In future research, we plan to leverage machine learning techniques for our power flow approximations, extend these methods to other parameters (e.g., current flows), and apply them to additional applications like capacity expansion planning problems.
일반주제명  
Violations
일반주제명  
Linear programming
일반주제명  
Computer engineering
키워드  
Constraint violations
키워드  
Linear functions
기타저자  
Georgia Institute of Technology.
기본자료저록  
Dissertations Abstracts International. 87-06B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798263394677
■035    ▼a(MiAaPQ)AAI32315653
■035    ▼a(MiAaPQ)GeorgiaTech73177
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a343.09
■1001  ▼aBuason,  Paprapee.
■24510▼aSample-Based  Power  Flow  Approximations:  Computational  Methods,  Analysis,  and  Applications
■260    ▼a[Sl]▼bGeorgia  Institute  of  Technology▼c2023
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2023
■300    ▼a142  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-06,  Section:  B.
■500    ▼aAdvisor:  Molzahn,  Daniel  K.
■5021  ▼aThesis  (Ph.D.)--Georgia  Institute  of  Technology,  2023.
■520    ▼aThe  non-convex  nature  of  the  power  flow  equations  poses  a  challenge  for  solving  various  power  system  optimization  and  control  problems.  To  address  these  challenges,  linear  approximations  are  often  employed.  However,  the  accuracy  of  these  linearizations  can  vary  depending  on  the  specific  characteristics  of  the  power  system  and  the  operational  range  in  which  they  are  applied.  Existing  linearizations  typically  rely  on  general  assumptions  that  apply  to  broad  classes  of  systems,  which  can  limit  their  accuracy  and  result  in  constraint  violations  when  applied  to  specific  systems.In  contrast  to  these  existing  approaches,  we  introduce  conservative  linear  approximations  of  the  power  flow  equations.  These  conservative  linearizations  intentionally  overestimate  or  underestimate  quantities  of  interest,  aiming  to  make  algorithms  more  tractable  while  avoiding  constraint  violations.  We  compute  these  conservative  linear  approximations  through  a  sample-based  method,  involving  the  solution  of  a  constrained  linear  regression  problem.Additionally,  we  introduce  a  class  of  approximations  based  on  rational  functions  with  linear  numerators  and  denominators.  This  choice  is  motivated  by  the  resulting  linear  inequality  constraints,  making  these  approximations  well-suited  for  optimization  formulations,  while  still  providing  enhanced  accuracy  compared  to  linear  functions.We  enhance  the  conservativeness  and  accuracy  of  our  approximations  through  an  iterative  sampling  method,  optimizing  these  functions  with  respect  to  the  relevant  quantities.  We  also  conduct  a  sample-complexity  analysis.  To  further  develop  our  approach,  we  establish  an  importance  sampling  method  for  constructing  linear  and  conservative  linear  approximations.  This  method's  objective  is  to  efficiently  improve  approximation  quality  by  selecting  the  most  informative  samples.  It  does  so  by  drawing  samples  from  a  relatively  low-dimensional  subspace  exhibiting  high  curvature.  This  approach  allows  us  to  obtain  highly  accurate  linear  approximations  with  significantly  fewer  samples  than  random  selection.  By  examining  the  relationships  between  the  voltage  magnitudes  and  the  active  and  reactive  power  injections,  we  characterize  the  performance  of  our  proposed  power  flow  approximations  for  a  range  of  test  cases.Furthermore,  we  examine  applications  of  conservative  linear  approximations  to  prove  their  effectiveness  in  an  optimal  sensor  placement  problem  that  we  formulate  as  a  bilevel  program.  In  the  optimal  sensor  placement  problem,  our  goal  is  to  place  a  minimal  number  of  sensors  and  avoid  false  sensor  alarms  in  the  upper  level  while  the  lower  level  ensures  that  these  sensors  will  detect  any  voltage  violations.  We  replace  the  nonlinear  power  flow  equations  with  conservative  linear  approximations  to  make  the  bilevel  problem  tractable.  With  conservative  linear  approximations,  we  can  ensure  that  the  resulting  sensor  locations  and  thresholds  are  sufficient  to  identify  any  constraint  violations.  Additionally,  we  apply  various  problem  reformulations  to  significantly  improve  computational  tractability  while  simultaneously  ensuring  an  appropriate  placement  of  sensors.  Lastly,  we  improve  the  quality  of  the  results  via  an  approximate  gradient  descent  method  that  adjusts  the  sensor  thresholds.  We  demonstrate  the  effectiveness  of  our  proposed  method  for  several  test  cases,  including  a  system  with  multiple  switching  configurations.Numerical  tests  demonstrate  that  our  power  flow  approximations  enhance  accuracy  compared  to  other  linear  approximations  and  prove  effective  in  optimization  problems.  In  future  research,  we  plan  to  leverage  machine  learning  techniques  for  our  power  flow  approximations,  extend  these  methods  to  other  parameters  (e.g.,  current  flows),  and  apply  them  to  additional  applications  like  capacity  expansion  planning  problems.
■590    ▼aSchool  code:  0078.
■650  4▼aViolations
■650  4▼aLinear  programming
■650  4▼aComputer  engineering
■653    ▼aConstraint  violations
■653    ▼aLinear  functions
■690    ▼a0464
■71020▼aGeorgia  Institute  of  Technology.
■7730  ▼tDissertations  Abstracts  International▼g87-06B.
■790    ▼a0078
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17365969▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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