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Metro is integral to the urban rail transit with the expansion of the city. Due to the tremendous power consuming of the traction load which is generally considered to be megawatt-class, the attendant problems concerning energy-saving and emission-reduction cannot be neglected. An approach wherein the photovoltaic plants are connected into the metro traction power supply system to provide electrical...
This paper proposes an improved energy management strategy for simultaneous power management of the photovoltaic grid-connected system with energy storage. Based on the DC bus voltage and the working states of grid, the PV system is divided into six working modes by the proposed energy management strategy. This can avoid the effect of grid failure on PV system, and achieve the optimal utilization...
With the increasing capacity of grid-connected PV power grids, photovoltaic power generation systems that are connected to the utility grid have shown increasing competitiveness. When the voltage drop occurs due to power short circuit fault, a Low Voltage Ride Through(LVRT) Technology is proposed to improve the stability of the power system. This work, based on the research of PV grid-connected inverter...
A 31 LEVEL Asymmetrical Cascaded H-Bridge Multilevel inverter (ASCHBMLI) with DC-DC Fly back converter with single DC source for photovoltaic system using Maximum Power Point Tracking system. In this paper the photovoltaic (PV) system is given input to the primary side of DC-DC converter, where as the secondary side of the converter consists of ‘n’ no of turns with different output voltage. In Maximum...
A robust nonlinear control strategy, based on back-stepping, is presented to adjust the dc-link voltage from the PV system and the current which is used to control the amount of injected active or reactive power into the grid. The control system is projected using an adaptive backstepping technique taking the unknown parameters into consideration. But many times, the problems of differential expansion...
Traditional substation station power are taken from the grid system, power consumption is relatively large, not only increases the power loss, but also the consumption of nonrenewable energy. With the development of micro-network technology, more power users tend to use the new micro-grid power supply mode to improve power supply reliability. In this paper, the power supply system of 500kv substation...
Residential solar photovoltaic (PV) energy is becoming an increasingly important part of the world's renewable energy. A residential solar PV array is usually connected to the distribution grid through a single-phase inverter. Control of the single-phase PV system should maximize the power output from the PV array while ensuring overall system performance, safety, reliability, and controllability...
Medium voltage grids are a suitable selection for the connection of high power applications. However, for certain applications, such as PV energy conversion systems or fast charging stations for PEVs, the DC voltages are limited to be below 1000 V, making difficult their connection to such grids without the use of a step-up transformer. Multilevel converters allow the grid connection of such DC loads,...
Microinverters connect a single photovoltaic (PV) module to the grid, and therefore require a high voltage step-up conversion ratio. This is usually achieved in a two-stage approach with a step-up dc-dc converter followed by a step-down inverter. More recently single-stage step-up inverters have been proposed under the assumption that less stages improves efficiency. This paper compares these two...
This paper proposes a novel approach to photovoltaic (PV) module level power electronics (MLPE). Functionally, it is a hybrid of PV power optimizer and microinverter with such key features as shade-tolerant (or global) maximum power point tracking (MPPT), galvanic isolation, direct AC connectivity, PV module level monitoring and safety cut-off, flexibility of installation and PV power system sizing...
In photovoltaic-battery systems, more attention is usually paid to the MPPT control while the battery management is put aside. This paper proposes two control strategies for an integrated PV-battery system, both of them making it possible to perform MPPT or regulate the battery voltage to its maximum value in order to prevent it from overcharging. Simulation results prove the feasibility of both controls.
The intermittent character of the photovoltaic generator, power electronic converters and load dynamic are the main factors leading operation instability in islanded microgrids. The necessity of the immediate control within the micro-source is very important since it impacts the interaction between micro-sources in the microgrid. This control level must be characterized by a fast and accurate response...
This paper presents a new method for the accelerated ageing tests of photovoltaic inverters, created by analyzing the mission profiles of the current and ambient temperature extracted over several years from multiple photovoltaic plants located in France. It is proposed to create a particular ageing profile which takes into account not only the different constraints of the application of the photovoltaic...
This paper reports simple and effective control logic for connecting abrupt, steep and short-term power sources (for example, regenerative power from electric railway vehicles) to distribution lines with renewable energy units connected. With conventional centralized control systems, power conditioner units were unable to keep voltage of the distribution line within an acceptable range when extremely...
A single phase transformer-less inverter is introduced in this paper. The negative polarities of the input voltage and output terminal have common ground. Therefore, the leakage current problem that is common in PV systems is eliminated naturally. In addition, the proposed inverter has fewer components compared with its counterparts and only one switch conducts during the active states which enhance...
This paper contains the findings regarding the evaluation of a standalone photovoltaic, where the photovoltaic voltage is inverted through a single stage boost DC/AC inverter, which is controlled by a double loop control. This document shows the results of the evaluation of reliability, efficiency and technical performance of the system in normal and specific operation. Meanwhile, the control used...
Due to the insignificant share of inverter-based Renewable Energy Resources (RER) as well as the uncertainty concerning their integration impacts, the capability of RERs to regulate voltage or frequency has not been widely used. However, inverter-based voltage/frequency regulation is of interest due to the fast growth of distributed RERs, especially solar Photovoltaic (PV) resources. The IEEE 1547a...
In this paper, a three-level Boost (TLB) converter maximum power point tracking (MPPT) control strategy for a two-stage photovoltaic (PV) system based on model predictive control (MPC) is proposed. This method realizes fast and precise control through establishment of a prediction model and minimization of a cost function. In the work, first a three-level predictive model for the boost converter is...
The emergence of clusters of rooftop Photovoltaic (PV) systems in Distribution Networks (DNs) might result into voltage rise that can exceed the voltage limits particularly in secondary systems. This paper assesses the performance of two smart inverter controllers (Volt-Watt and Volt-Var) to mitigate these technical problems. A large-scale DN fully modeled in OpenDSS is used in the assessment considering...
In this work, an analysis of grid parity for residential and commercial photovoltaic generators in an important city of Argentina is presented. The analysis includes installation costs, levelized costs of photovoltaic energy, grid electricity price and incentive programs that promote the insertions of those generators in low demand users. A specific analysis on the economic viability of low power...
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