skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A Coordinated Compensation Strategy for Module-Mismatch of CHB-PV Systems Based on Improved LS-PWM and Reactive Power Injection

Journal Article · · IEEE Translations on Industrial Electronics
 [1];  [1];  [1]; ORCiD logo [2];  [3]
  1. Huazhong Univ. of Science and Technology, Hubei (China)
  2. Siemens Corp., Princeton, NJ (United States)
  3. Lehigh Univ., Bethlehem, PA (United States)
+ Show Author Affiliations

Here, the cascaded H-bridge (CHB) converter has become a promising candidate topology for utility-scale photovoltaic systems thanks to merits like modular structure, distributed maximum power point tracking (MPPT), and direct distribution grid access without medium-voltage transformers, etc. However, module-mismatches arising from non-ideal elements like partial shading and parameter variations pose a technical challenge for such systems. If not dealt with properly, module-mismatches can lead to adverse effects like unbalanced dc-link voltages of the modules, distortion of grid current, reduced power generation, etc. Conventional methods, such as reactive power compensation and level-shifted pulse-width modulation (LS-PWM) based compensation, can alleviate this issue, but their performances are still limited by the allowable modulation range of power converters. In this paper, a compensation strategy combining reactive power compensation with a novel modulation method is proposed to extend the operating range in terms of module mismatch. Experimental results on a 2.4kW/208V single-phase setup are presented and have demonstrated that the proposed method can not only ride through a larger range of module-mismatches but also improve solar power utilization and system efficiency owing to reduced switching events, non-compromised MPPT, and less required reactive power.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Electricity (OE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1461674
Journal Information:
IEEE Translations on Industrial Electronics, Vol. 66, Issue 4; ISSN 0278-0046
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

Figures / Tables (22)

Fig. 1(p. 2)figure Fig. 1
Fig. 2(p. 2)figure Fig. 2
Fig. 3(p. 3)figure Fig. 3
Fig. 4(p. 3)figure Fig. 4
Fig. 5(p. 4)figure Fig. 5
Fig. 6(p. 4)figure Fig. 6
Fig. 7(p. 4)figure Fig. 7
Fig. 8(p. 5)figure Fig. 8
Fig. 9(p. 5)figure Fig. 9
Fig. 10(p. 6)figure Fig. 10
Fig. 11(p. 6)figure Fig. 11
Fig. 12(p. 6)figure Fig. 12
Fig. 13(p. 7)figure Fig. 13
Fig. 14(p. 7)figure Fig. 14
Fig. 15(p. 7)figure Fig. 15
Fig. 16(p. 8)figure Fig. 16
Fig. 17(p. 8)figure Fig. 17
Fig. 18(p. 8)figure Fig. 18
TABLE I(p. 8)table TABLE I
Table II(p. 8)table Table II
Fig. 19(p. 9)figure Fig. 19
Fig. 20(p. 9)figure Fig. 20

Similar Records

Coupled-DC Module-Based Photovoltaic System With Power Mismatch-Tolerated Modulation
Journal Article · 2022 · IEEE Journal of Emerging and Selected Topics in Power Electronics · OSTI ID:1461674
+2 more
An Efficient Modulation Strategy for Cascaded Photovoltaic Systems Suffering From Module Mismatch
Journal Article · 2017 · IEEE Journal of Emerging and Selected Topics in Power Electronics · OSTI ID:1461674
+2 more
Applying PWM to control overcurrents at unbalanced faults of force-commutated VSCs used as static var compensators
Journal Article · 1997 · IEEE Transactions on Power Delivery · OSTI ID:1461674

Related Subjects

42 ENGINEERING
cascaded H-bridge converter
PV system
module-mismatch
modulation
reactive power compensation
extended operating range