Implementation of a Cubature Kalman Filter for Power Estimation of Non-ideal Constant Power Loads in a DC Microgrid

Shirin Yousefizadeh*, Navid Vafamand, Jan Dimon Bendtsen, Mohammad Hassan Khooban, Frede Blaabjerg

*Kontaktforfatter

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Resumé

DC microgrids (MG) involve the integration of power electronic loads, which might behave as constant power loads (CPL). CPLs often degrade system stability due to their negative impedance characteristics. To maintain the voltage stability and safe operation of DC MGs, eliminating the undesired behavior of CPLs is a necessity. This aim requires the instantaneous power value of the time-varying uncertain CPLs. Since the integration of current sensors in DC MGs is costly and inefficient, estimation methods should be used to obtain the spontaneous power of CPLs. In this paper, a 3rd degree cubature Kalman filter (CKF) is developed to estimate the power of the CPLs alongside estimation of CPLs’ and source’s currents in a DC MG. By considering the CPLs powers as artificial states and augmenting them into the system states, not only the DC MG states but also the unknown values of the CPLs powers may be estimated. The proposed estimator is tested on a DC MG that feeds one CPL. The experimental results show that the proposed CKF is able to estimate instantaneous power consumption of the CPL as well as source and load currents.
OriginalsprogEngelsk
Artikelnummer15
TidsskriftWSEAS TRANSACTIONS on POWER SYSTEMS
Vol/bind14
Sider (fra-til)122-129
Antal sider8
ISSN2224-350X
StatusUdgivet - 2019

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Kalman filters
Power electronics
System stability
Voltage control
Electric power utilization
Sensors

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title = "Implementation of a Cubature Kalman Filter for Power Estimation of Non-ideal Constant Power Loads in a DC Microgrid",
abstract = "DC microgrids (MG) involve the integration of power electronic loads, which might behave as constant power loads (CPL). CPLs often degrade system stability due to their negative impedance characteristics. To maintain the voltage stability and safe operation of DC MGs, eliminating the undesired behavior of CPLs is a necessity. This aim requires the instantaneous power value of the time-varying uncertain CPLs. Since the integration of current sensors in DC MGs is costly and inefficient, estimation methods should be used to obtain the spontaneous power of CPLs. In this paper, a 3rd degree cubature Kalman filter (CKF) is developed to estimate the power of the CPLs alongside estimation of CPLs’ and source’s currents in a DC MG. By considering the CPLs powers as artificial states and augmenting them into the system states, not only the DC MG states but also the unknown values of the CPLs powers may be estimated. The proposed estimator is tested on a DC MG that feeds one CPL. The experimental results show that the proposed CKF is able to estimate instantaneous power consumption of the CPL as well as source and load currents.",
author = "Shirin Yousefizadeh and Navid Vafamand and Bendtsen, {Jan Dimon} and Khooban, {Mohammad Hassan} and Frede Blaabjerg",
year = "2019",
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Implementation of a Cubature Kalman Filter for Power Estimation of Non-ideal Constant Power Loads in a DC Microgrid. / Yousefizadeh, Shirin; Vafamand, Navid; Bendtsen, Jan Dimon; Khooban, Mohammad Hassan; Blaabjerg, Frede.

I: WSEAS TRANSACTIONS on POWER SYSTEMS, Bind 14, 15, 2019, s. 122-129.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Implementation of a Cubature Kalman Filter for Power Estimation of Non-ideal Constant Power Loads in a DC Microgrid

AU - Yousefizadeh, Shirin

AU - Vafamand, Navid

AU - Bendtsen, Jan Dimon

AU - Khooban, Mohammad Hassan

AU - Blaabjerg, Frede

PY - 2019

Y1 - 2019

N2 - DC microgrids (MG) involve the integration of power electronic loads, which might behave as constant power loads (CPL). CPLs often degrade system stability due to their negative impedance characteristics. To maintain the voltage stability and safe operation of DC MGs, eliminating the undesired behavior of CPLs is a necessity. This aim requires the instantaneous power value of the time-varying uncertain CPLs. Since the integration of current sensors in DC MGs is costly and inefficient, estimation methods should be used to obtain the spontaneous power of CPLs. In this paper, a 3rd degree cubature Kalman filter (CKF) is developed to estimate the power of the CPLs alongside estimation of CPLs’ and source’s currents in a DC MG. By considering the CPLs powers as artificial states and augmenting them into the system states, not only the DC MG states but also the unknown values of the CPLs powers may be estimated. The proposed estimator is tested on a DC MG that feeds one CPL. The experimental results show that the proposed CKF is able to estimate instantaneous power consumption of the CPL as well as source and load currents.

AB - DC microgrids (MG) involve the integration of power electronic loads, which might behave as constant power loads (CPL). CPLs often degrade system stability due to their negative impedance characteristics. To maintain the voltage stability and safe operation of DC MGs, eliminating the undesired behavior of CPLs is a necessity. This aim requires the instantaneous power value of the time-varying uncertain CPLs. Since the integration of current sensors in DC MGs is costly and inefficient, estimation methods should be used to obtain the spontaneous power of CPLs. In this paper, a 3rd degree cubature Kalman filter (CKF) is developed to estimate the power of the CPLs alongside estimation of CPLs’ and source’s currents in a DC MG. By considering the CPLs powers as artificial states and augmenting them into the system states, not only the DC MG states but also the unknown values of the CPLs powers may be estimated. The proposed estimator is tested on a DC MG that feeds one CPL. The experimental results show that the proposed CKF is able to estimate instantaneous power consumption of the CPL as well as source and load currents.

M3 - Journal article

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EP - 129

JO - WSEAS TRANSACTIONS on POWER SYSTEMS

JF - WSEAS TRANSACTIONS on POWER SYSTEMS

SN - 2224-350X

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