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Power quality enhancement in utility grid using distributed energy resources integrated BBC-VSI based DSTATCOM

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Abstract

In this research work, two Back to Back connected 2-level voltage source inverters (BBC-VSI) under three phase three wire weak utility grid is examined. Generally, the challenges addressed in the modern utility grid are end users’ nonlinear loads and dependency on conventional energy sources. The end users’ nonlinear loads generate power quality (PQ) issues and dependency on conventional energy sources raises environment pollution and economic crises. The BBC-VSI based distribution static compensator (DSTATCOM) topology consists of two voltage source inverters (VSIs) supplied by a distributed energy resources (DERs) supported common DC-link capacitor. A sparse least mean squares (SLMS) technique is selected for generating the pulses IGBTs. The SLMS technique offers high estimation speed, less than one cycle weight convergence, fast transient response and small error in steady state over conventional technique. A holistic comparison is performed between the BBC-VSI and VSI using the field programmable gate arrays (FPGA) SPARTAN-6 control board regarding optimal power flow control, which shows the BBC-VSI is competitive. Also, it is authenticated under different conditions like source current shaping before and after compensation, source power failure, DER power fluctuation, nonlinear load variation, etc., which are naturally encountered in a modern utility grid.

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Abbreviations

\({i}_{sa,}{i}_{sb},{i}_{sc}\) :

Actual source currents

\({w}_{p}\) :

Active weighting values (Mean value)

\({\gamma }_{k}\) :

Associated weight

\({P}_{BBC-VSI}\) :

Back-to-back connected voltage source inverter power

\({Z}_{c}\) :

Compensating impedance

\({v}_{dc}\) :

Common DC-link voltage

\({P}_{DER}\) :

DER power

\({v}_{te}\) :

Error in AC voltage

\({v}_{de}\) :

Error in DC voltage

\({e}_{k}\) :

Estimation error

\({L}_{f}\) :

Filter inductance

h :

Hysteresis band

\({I}_{DC1}\) :

Input DC link current

\({P}_{loss}\) :

Inverter power loss

\({f}_{max}\) :

Maximum switching frequency

\({I}_{DC2}\) :

Output DC link current

\({v}_{t}\) :

Peak AC voltage

\(\Delta {v}_{DC}\) :

Peak to peak DC link voltage ripple

\({v}_{s}\) :

Peak value of the utility grid phase voltage

\({i}_{aa}, {i}_{ab}, {i}_{ac}\) :

Reference active component of each phase

\({i}_{ra}, {i}_{rb}, {i}_{rc}\) :

Reference reactive component of each phase

\({w}_{q}\) :

Reactive weighting values (Mean value)

\({v}_{dc (ref)}\) :

Reference DC link voltage

\({\mu }_{k}\) :

Rate of convergence

\({P}_{utilitygrid}\) :

Real power injection to the utility grid

\(S\) :

Rating of individual inverter

\({\xi }_{k}\) :

Sparse constant

\(\omega\) :

System frequency

\({\sigma }_{k}\) :

Step size

\({i}_{sa,}{i}_{sb}, {i}_{sc}\) :

3-Phase source currents

\({i}_{ca}\) , \({i}_{cb}\) , \({i}_{cc}\) :

3-Phase compensating currents

\({w}_{pa},{w}_{pb},{w}_{pc}\) :

3-Phase load current’s active updated weight corresponding to each phase

\({w}_{qa},{w}_{qb},{w}_{qc}\) :

3-Phase load current’s re-active updated weight corresponding to each phase

\({u}_{pa}, {u}_{pb}, {u}_{pc}\) :

3-Phase unit voltage templates

\({i}_{la}\) , \({i}_{lb}\) , \({i}_{lc}\) :

3-Phase load currents

\({i}_{sa}^{*}, {i}_{sb}^{*}, {i}_{sc}^{*}\) :

3-Phase reference source currents

BBC-VSI:

Back-to-back connected 2-level voltage source inverters

DVR:

Dynamic voltage restorer

DSTATCOM:

Distribution static compensator

DERs:

Distributed energy resources

FPGA:

Field programmable gate arrays

HUPQC:

Hybrid unified power quality conditioner

HVDC:

High voltage direct current

IGBT:

Insulated gate bipolar transistors

MCCB:

Molded case circuit breaker

MCB:

Miniature circuit breaker

MFM:

Multi-function meters

NN:

Neural network

PCC:

Point of common coupling

P.F:

Power factor

PQ:

Power quality

SAPF:

Shunt active power filters

SSC:

Static series compensator

SLMS:

Sparse least mean squares

THD:

Total harmonic distortion

UPS:

Uninterruptible power supplies

VSI:

Voltage source inverter

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Acknowledgements

The Funding was provided by SERB (Sanction no. SERB/F/8504/2019-2020, Govt. of India).

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Authors and Affiliations

  1. Department of Electrical Engineering, Odisha University of Technology and Research, Bhubaneswar, 751029, India

    Jogeswara Sabat & Ajit Kumar Barisal

  2. Department of Electrical & Electronics Engineering, SRM University, Amaravati, Andhra Pradesh, 522240, India

    Mrutyunjaya Mangaraj

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  1. Jogeswara Sabat
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  2. Mrutyunjaya Mangaraj
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  3. Ajit Kumar Barisal
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Correspondence to Jogeswara Sabat.

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Sabat, J., Mangaraj, M. & Barisal, A.K. Power quality enhancement in utility grid using distributed energy resources integrated BBC-VSI based DSTATCOM. Int J Syst Assur Eng Manag (2024). https://doi.org/10.1007/s13198-024-02289-9

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