Microgrid central fuzzy controller for active and reactive power flow using instantaneous power measurements

The equipments based on the power electronics have been improved under the name of Flexible Alternating Current Transmission Systems (FACTS) in the last years. Unified Power Flow Controller (UPFC) is the most widely used FACTS device to control the power flow and to optimize the system stability in the transmission line. UPFC is a FACTS devices that can control active and reactive power flow in transmission line by means of injection controllable series voltage to the transmission line. This paper proposes a new connection for a Unified Power Flow Controller (UPFC) to control the active and reactive power flow control in two sides of a transmission line independently and it regulates bus voltage in the same transmission line, furthermore it is possible to balance line current too. This connection of the UPFC will be called an center node UPFC (C_UPFC). It is one of the newest devices within the FACTS technology. The structure and capability of the C_UPFC is discussed and its control scheme is based on the d-q orthogonal coordinates. According to this, the performance of UPFC for several modes of operations using different control mechanisms based on Proportional-Integral (PI) and PID based controllers has been studied. The obtained simulation results from Matlab/simulink confirm the effective features.

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Hybrid optimal management of active and reactive power flow in a smart microgrid with photovoltaic generation

Microsystem Technologies ◽

10.1007/s00542-019-04354-x ◽

2019 ◽

Vol 25 (11) ◽

pp. 4077-4090 ◽

Cited By ~ 4

Author(s):

M. Et-Taoussi ◽

H. Ouadi ◽

H. E. Chakir

Keyword(s):

Power Flow ◽

Reactive Power ◽

Optimal Management ◽

Photovoltaic Generation ◽

Active And Reactive Power ◽

Reactive Power Flow

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Novel Implementation and Comparison of Active and Reactive Power Flow Control Methods in a Single Phase Grid-Connected Microgrid

IEEE Transactions on Industry Applications ◽

10.1109/tia.2020.2965080 ◽

2020 ◽

Vol 56 (2) ◽

pp. 1631-1639 ◽

Cited By ~ 1

Author(s):

Dimitrios Kanavaros ◽

Giovanna Oriti ◽

Alexander L. Julian

Keyword(s):

Flow Control ◽

Power Flow ◽

Single Phase ◽

Reactive Power ◽

Control Methods ◽

Power Flow Control ◽

Active And Reactive Power ◽

Reactive Power Flow

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Demodulation of Three-Phase AC Power Transients in the Presence of Harmonic Distortion

Energies ◽

10.3390/en13092341 ◽

2020 ◽

Vol 13 (9) ◽

pp. 2341

Author(s):

Benjamin T. Gwynn ◽

Raymond de Callafon

Keyword(s):

Power Systems ◽

Power Flow ◽

Reactive Power ◽

Harmonic Distortion ◽

Transient Effects ◽

Active And Reactive Power ◽

Reactive Power Flow ◽

Ac Power ◽

Rlc Circuit ◽

Smart Inverters

Load switches in power systems may cause oscillations in active and reactive power flow. Such oscillations can be damped by synthetic inertia provided by smart inverters providing power from DC sources such as photovoltaic or battery storage. However, AC current provided by inverters is inherently non-sinusoidal, making measurements of active and reactive power subject to harmonic distortion. As a result, transient effects due to load switching can be obscured by harmonic distortion. An RLC circuit serves as a reference load. The oscillation caused by switching in the load presents as a dual-sideband suppressed-carrier signal. The carrier frequency is available via voltage data but the phase is not. Given a group of candidate signals formed from phase voltages, an algorithm based on Costas Loop that can quickly quantify the phase difference between each candidate and carrier (thus identifying the best signal for demodulation) is presented. Algorithm functionality is demonstrated in the presence of inverter-induced distortion.

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