A Unified Power-Setpoint Tracking Algorithm for Utility-Scale PV Systems With Power Reserves and Fast Frequency Response Capabilities

This paper presents a fast power-setpoint tracking algorithm to enable utility-scale photovoltaic (PV) systems to provide high quality grid services such as power reserves and fast frequency response. The algorithm unites maximum power-point estimation (MPPE) with flexible power-point tracking (FPPT...

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Veröffentlicht in:IEEE transactions on sustainable energy 2022-01, Vol.13 (1), p.479-490
Hauptverfasser: Paduani, Victor Daldegan, Yu, Hui, Xu, Bei, Lu, Ning
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Yu, Hui
Xu, Bei
Lu, Ning
description This paper presents a fast power-setpoint tracking algorithm to enable utility-scale photovoltaic (PV) systems to provide high quality grid services such as power reserves and fast frequency response. The algorithm unites maximum power-point estimation (MPPE) with flexible power-point tracking (FPPT) control to improve the performance of both algorithms, achieving fast and accurate PV power-setpoint tracking even under rapid solar irradiance changes. The MPPE is developed using a real-time, nonlinear curve-fitting approach based on the Levenberg-Marquardt algorithm. A modified adaptive FPPT based on the Perturb and Observe technique is developed for the power-setpoint tracking. By using MPPE to decouple the impact of irradiance changes on the measured PV output power, we develop a fast convergence technique for tracking power-reference changes within three FPPT iterations. Furthermore, to limit the maximum output power ripple, a new design is introduced for the steady-state voltage step size of the adaptive FPPT. The proposed algorithm is implemented on a testbed consisting of a 500 kVA three-phase, single-stage, utility-scale PV system on the OPAL-RT eMEGASIM platform. Results show that the proposed method outperforms the state-of-the-art.
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1949-3037
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subjects Adaptive algorithms
Algorithms
Current measurement
Curve fitting
Energy & Fuels
Engineering
fast frequency response
FPPT
Frequency dependence
Frequency response
Inverter control
Irradiance
Mathematical models
Maximum power tracking
MPPE
Photovoltaic cells
Photovoltaics
power curtailment
power regulation
power reserves
PV system
Real-time systems
Reserves
Science & Technology - Other Topics
Steady-state
Temperature measurement
Tracking control
Voltage measurement
title A Unified Power-Setpoint Tracking Algorithm for Utility-Scale PV Systems With Power Reserves and Fast Frequency Response Capabilities
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