PMU-Based Decoupled State Estimation for Unsymmetrical Power Systems
Modal decomposition of measurement equations has already been shown to simplify the formulation and resulting computational complexity of three-phase state estimation of systems where all the transmission lines are three-phase and fully transposed. When there are non-transposed and/or mixed-phase li...
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| Veröffentlicht in: | IEEE transactions on power systems 2021-11, Vol.36 (6), p.5359-5368 |
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| creator | Khalili, Ramtin Abur, Ali |
| description | Modal decomposition of measurement equations has already been shown to simplify the formulation and resulting computational complexity of three-phase state estimation of systems where all the transmission lines are three-phase and fully transposed. When there are non-transposed and/or mixed-phase lines, modal decomposition can no longer fully decouple the three-phase measurement equations. This paper addresses the above shortcoming by proposing a simple yet practical solution based on the commonly used numerical compensation techniques. Thus, it enables application of the powerful decoupling approach to any type of three-phase networks which may contain non-transposed or mixed-phase lines and are fully observable by PMUs. The proposed procedure modifies the measurement set by deriving additive terms that compensate for the neglected unsymmetrical effects. It will be shown that unbalanced systems including non-transposed and mixed-phase elements, can still be transformed into three decoupled subsystems and solved in parallel by the proposed approach. Performance of the proposed algorithm is validated against several IEEE test cases. |
| doi_str_mv | 10.1109/TPWRS.2021.3069738 |
| format | Article |
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When there are non-transposed and/or mixed-phase lines, modal decomposition can no longer fully decouple the three-phase measurement equations. This paper addresses the above shortcoming by proposing a simple yet practical solution based on the commonly used numerical compensation techniques. Thus, it enables application of the powerful decoupling approach to any type of three-phase networks which may contain non-transposed or mixed-phase lines and are fully observable by PMUs. The proposed procedure modifies the measurement set by deriving additive terms that compensate for the neglected unsymmetrical effects. It will be shown that unbalanced systems including non-transposed and mixed-phase elements, can still be transformed into three decoupled subsystems and solved in parallel by the proposed approach. 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Performance of the proposed algorithm is validated against several IEEE test cases.</description><subject>Algorithms</subject><subject>Compensation methods</subject><subject>Decomposition</subject><subject>Decoupling</subject><subject>ENGINEERING</subject><subject>Load management</subject><subject>Mathematical analysis</subject><subject>Modal decoupling</subject><subject>Phase measurement</subject><subject>Phasor Measurement Units</subject><subject>State estimation</subject><subject>Subsystems</subject><subject>Three-phase electric power</subject><subject>three-phase state estimation</subject><subject>Transmission lines</subject><issn>0885-8950</issn><issn>1558-0679</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNo9kMtOAjEUhhujiYi-gG4muh7shd6WCnhJMBKBuGw65UwcAlNsSwxvbxHiqifp95_850PomuAeIVjfzyafH9MexZT0GBZaMnWCOoRzVWIh9SnqYKV4qTTH5-gixiXGWOSPDhpO3ublo42wKIbg_HazytM02QTFKKZmbVPj26L2oZi3cbdeQwqNs6ti4n8gFNNdTLCOl-istqsIV8e3i-ZPo9ngpRy_P78OHsalY0KkkvZlvwKnRUW55tIqzWSfMrwQGhyuMZaO0aq2mltnK1HViou-c4TIShDMCOui28Nen6uZ6JoE7sv5tgWXDJFKCqIydHeANsF_byEms_Tb0OZehnLFBBOU8UzRA-WCjzFAbTYhXxt2hmCzV2r-lJq9UnNUmkM3h1ADAP8BzXQup9gv2fFxIw</recordid><startdate>20211101</startdate><enddate>20211101</enddate><creator>Khalili, Ramtin</creator><creator>Abur, Ali</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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When there are non-transposed and/or mixed-phase lines, modal decomposition can no longer fully decouple the three-phase measurement equations. This paper addresses the above shortcoming by proposing a simple yet practical solution based on the commonly used numerical compensation techniques. Thus, it enables application of the powerful decoupling approach to any type of three-phase networks which may contain non-transposed or mixed-phase lines and are fully observable by PMUs. The proposed procedure modifies the measurement set by deriving additive terms that compensate for the neglected unsymmetrical effects. It will be shown that unbalanced systems including non-transposed and mixed-phase elements, can still be transformed into three decoupled subsystems and solved in parallel by the proposed approach. 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| source | IEEE Electronic Library (IEL) |
| subjects | Algorithms Compensation methods Decomposition Decoupling ENGINEERING Load management Mathematical analysis Modal decoupling Phase measurement Phasor Measurement Units State estimation Subsystems Three-phase electric power three-phase state estimation Transmission lines |
| title | PMU-Based Decoupled State Estimation for Unsymmetrical Power Systems |
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