DC-Bus Voltage Range Extension in 1500 V Photovoltaic Inverters

Solar plants based on single-stage conversion photovoltaic (PV) inverters (no dc-dc boost stage) have gained popularity due to their simplicity, high efficiency, and cost effectiveness. Existing PV plants mostly operate under 1000 V and are subject to wide dc-bus voltage variations due to the effect...

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Published inIEEE journal of emerging and selected topics in power electronics Vol. 3; no. 4; pp. 901 - 917
Main Authors Serban, Emanuel, Ordonez, Martin, Pondiche, Cosmin
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.12.2015
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
1000V and 1500V PV systems
Arrays
Control systems
DC-bus voltage utilization
Inverters
Modulation
Motors
Temperature distribution
Third-harmonic zero-sequence
Three phase modulation
Voltage control
third-harmonic zero-sequence (3H-ZS)
1000 and 1500 V PV systems
dc-bus voltage utilization
three-phase modulation
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Abstract Solar plants based on single-stage conversion photovoltaic (PV) inverters (no dc-dc boost stage) have gained popularity due to their simplicity, high efficiency, and cost effectiveness. Existing PV plants mostly operate under 1000 V and are subject to wide dc-bus voltage variations due to the effect of PV cell temperature and the voltage of the maximum power point (well below the open-circuit voltage). In particular, attractive locations, such as U.S.-Canada mountain and central regions, are subject to extreme PV surface temperatures, making the dc-bus voltage variation a challenge for single-stage solar inverters. This paper investigates 1500 V solar inverters with a focus on dc-bus voltage range extension capabilities through novel modulation and power devices utilization. A comparative analysis with the existing 1000 V solar inverters is presented to illustrate the significant advantages of the wide dc-bus range in 1500 V systems. A lower voltage limit in the dc-bus is achieved by employing a novel voltage reactive power dc-bus control strategy and modified modulation. A higher dc-bus peak voltage is obtained by maximizing the use of power switches. As a result, the 1500 V inverter dc-bus voltage is significantly extended to capture energy under extreme PV surface temperatures, greatly improving the limited range of traditional 1000 V inverters. Simulations and experimental results using a three-phase three-level neutral point-clamped inverter level are presented to validate the proposed dc-bus extension range, control strategy, and modulation scheme.
AbstractList Solar plants based on single-stage conversion photovoltaic (PV) inverters (no dc-dc boost stage) have gained popularity due to their simplicity, high efficiency, and cost effectiveness. Existing PV plants mostly operate under 1000 V and are subject to wide dc-bus voltage variations due to the effect of PV cell temperature and the voltage of the maximum power point (well below the open-circuit voltage). In particular, attractive locations, such as U.S.-Canada mountain and central regions, are subject to extreme PV surface temperatures, making the dc-bus voltage variation a challenge for single-stage solar inverters. This paper investigates 1500 V solar inverters with a focus on dc-bus voltage range extension capabilities through novel modulation and power devices utilization. A comparative analysis with the existing 1000 V solar inverters is presented to illustrate the significant advantages of the wide dc-bus range in 1500 V systems. A lower voltage limit in the dc-bus is achieved by employing a novel voltage reactive power dc-bus control strategy and modified modulation. A higher dc-bus peak voltage is obtained by maximizing the use of power switches. As a result, the 1500 V inverter dc-bus voltage is significantly extended to capture energy under extreme PV surface temperatures, greatly improving the limited range of traditional 1000 V inverters. Simulations and experimental results using a three-phase three-level neutral point-clamped inverter level are presented to validate the proposed dc-bus extension range, control strategy, and modulation scheme.
Author Serban, Emanuel
Ordonez, Martin
Pondiche, Cosmin
Author_xml – sequence: 1
  givenname: Emanuel
  surname: Serban
  fullname: Serban, Emanuel
  email: emaserban@ieee.org
  organization: Dept. of Electr. & Comput. Eng., Univ. of British Columbia, Vancouver, BC, Canada
– sequence: 2
  givenname: Martin
  surname: Ordonez
  fullname: Ordonez, Martin
  email: mordonez@ieee.org
  organization: Dept. of Electr. & Comput. Eng., Univ. of British Columbia, Vancouver, BC, Canada
– sequence: 3
  givenname: Cosmin
  surname: Pondiche
  fullname: Pondiche, Cosmin
  email: cosmin.pondiche@schneider-electric.com
  organization: Schneider Electr. Solar Bus., Burnaby, BC, Canada
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Keywords third-harmonic zero-sequence (3H-ZS)
1000 and 1500 V PV systems
dc-bus voltage utilization
three-phase modulation
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Snippet Solar plants based on single-stage conversion photovoltaic (PV) inverters (no dc-dc boost stage) have gained popularity due to their simplicity, high...
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SubjectTerms 1000V and 1500V PV systems
Arrays
Control systems
DC-bus voltage utilization
Inverters
Modulation
Motors
Temperature distribution
Third-harmonic zero-sequence
Three phase modulation
Voltage control
Title DC-Bus Voltage Range Extension in 1500 V Photovoltaic Inverters
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