- 标题
- 摘要
- 关键词
- 实验方案
- 产品
过滤筛选
- 2018
- rural electrification
- optimised renewable energy utilisation
- power sharing
- micro grid
- community development
- grid interconnection
- IoT based data acquisition system
- Grid tie solar PV system
- IoT
- Losses in Solar PV plant
- Electrical Engineering and Automation
- Amrita School of Engineering
- Zeal College of Engineering and Research
-
[IEEE 2018 IEEE Power & Energy Society General Meeting (PESGM) - Portland, OR, USA (2018.8.5-2018.8.10)] 2018 IEEE Power & Energy Society General Meeting (PESGM) - Comparative Study of Active Power Curtailment Methods of PVs for Preventing Overvoltage on Distribution Feeders
摘要： Overvoltage is one of the major issues on distribution grids with high penetration of photovoltaic (PV) generation. Overvoltage could be prevented through the control of active/reactive power of PVs. However, given the high R/X ratio of low voltage feeders, voltage control by using reactive power would not be as effective as using active power. Therefore, active power curtailment (APC) of PVs, though not desirable, becomes necessary at times to prevent the overvoltage issues. Existing literature is rich in centralized and droop-based methods for APC and/or reactive power control of PVs to prevent overvoltage issues. In this context, this paper revisits the most popular existing methods, and evaluates the performance of droop-based and centralized methods using a typical North American 240 V low voltage feeder with 24 residential homes. In this work, our key findings are: a) droop-based methods provided conservative solutions or did not eliminate the overvoltages completely, b) power flow sensitivity based droop approach led to 13% more curtailment than the centralized approaches, c) centralized approach had 40% less energy curtailed compared with standard droop while no overvoltages were observed, and d) operating PVs at non-unity power factor in centralized approach led to 5% less energy curtailment.
关键词： Inverter,Overvoltage,Photovoltaic,Power Curtailment,Voltage Control,Distribution Grid
更新于2025-09-23 15:23:52
-
Improved three-vector based dead-beat model predictive direct power control strategy for grid-connected inverters
摘要： Since only one inverter voltage vector is applied during each duty cycle, traditional model predictive direct power control (MPDPC) for grid-connected inverters (GCIs) results in serious harmonics in current and power. Moreover, a high sampling frequency is needed to ensure satisfactory steady-state performance, which is contradictory to its long execution time due to the iterative prediction calculations. To solve these problems, a novel dead-beat MPDPC strategy is proposed, using two active inverter voltage vectors and one zero inverter voltage vector during each duty cycle. Adoption of three inverter vectors ensures a constant switching frequency. Thus, smooth steady-state performance of both current and power can be obtained. Unlike the traditional three-vector based MPDPC strategy, the proposed three vectors are selected based on the power errors rather than the sector where the grid voltage vector is located, which ensures that the duration times of the selected vectors are positive all the time. Iterative calculations of the cost function in traditional predictive control are also removed, which makes the proposed strategy easy to implement on digital signal processors (DSPs) for industrial applications. Results of experiments based on a 1 kW inverter setup validate the feasibility of the proposed three-vector based dead-beat MPDPC strategy.
关键词： Grid-connected inverter,Model predictive control,Constant switching frequency,Power errors,Direct power control,Three vectors
更新于2025-09-23 15:23:52
-
[SpringerBriefs in Energy] Grid Parity and Carbon Footprint (An Analysis for Residential Solar Energy in the Mediterranean Area) ||
摘要： In the context of global warming, big cities’ atmosphere is always more contaminated and natural disasters in augmentation, solar energy, and more generally renewable energies are sources of great enthusiasm. Besides, thanks to recent improvements in technologies, the costs of photovoltaic (PV) have strongly declined in the last decades and are now accessible for particulars. The purpose of this project is then to study the economic profitability of solar energy for a residential use. A common and appropriate tool for this is the grid parity. This term, largely used in the literature, refers to the moment when producing electricity from solar modules will have the same cost than buying it from the grid. Grid parity depends mainly on the geographic position (as solar irradiation is very different from a place to another) and on the local electricity price. Consequently, a country with expensive electricity and a high rate of irradiation is more likely to reach grid parity soon. In the present study, the geographic framework chosen is the Mediterranean area, which includes countries with similar climates but with other differences sufficiently important to obtain interesting comparative results. The PV system used in the following model is a basic one since it does not include energy storage or resale to the grid, which gives a conservative perspective to the study. Extensive financial analysis is conducted in order to determine under which conditions it is the most profitable. The secondary objective is to evaluate the environmental impact of solar energy, mainly by carrying out carbon footprint analysis. It basically consists in comparing the emissions released by the manufacturing process of the modules to the reduction obtained thanks to its utilization. This study is first realized at an individual level and, then, is generalized at a national one in order to measure what could be the contribution of a massive investment in residential solar energy to the Paris agreement objectives.
关键词： Mediterranean area,Carbon footprint,Residential solar energy,Economic profitability,Environmental impact,Photovoltaic energy,Grid parity
更新于2025-09-23 15:23:52
-
Framework of Gradient Descent Least Squares Regression Based NN Structure for Power Quality Improvement in PV Integrated Low-Voltage Weak Grid System
摘要： This work proposes a novel gradient descent least squares regression (GDLSR) based neural network (NN) structure for control of grid-integrated solar PV (Photovoltaic) system with improved power quality. Here, a single layer neuron structure is used for the extraction of fundamental component (FC) from the load current. During FC extraction, GDLSR based NN structure attenuates harmonic components, noise, DC offsets, bias, notches and distortions from the nonlinear current, which improves the power quality under normal as well as under abnormal grid conditions. This single layer GDLSR-based NN structure has a very simple architecture, which decreases the computational burden and algorithm complexity. Therefore, it is easy in implementation. In this work, the GDLSR based control technique is tested on a single-phase single-stage grid-integrated PV topology with the nonlinear loads. The prime objective of the GDLSR based NN structure is to provide reactive power compensation, power factor correction, harmonics filtering and mitigation of other power quality issues. Moreover, when solar irradiation is zero, then the DC link capacitor and VSC, act as a distribution static compensator (DSTATCOM), which enhances the utilization factor of the system. The proposed system is modelled, and its performances are verified experimentally on a developed prototype in different grid disturbances as well as solar insolation variation conditions, which performances have satisfied the motive of proposed technique as well as the IEEE-519 standard.
关键词： Single-phase Grid,GDLSR based Control,Grid Integration,Single-stage Topology,Solar Energy,Power Quality,DSTATCOM
更新于2025-09-23 15:22:29
-
Novel High Gain, High Efficiency DC–DC Converter Suitable for Solar PV Module Integration With Three-Phase Grid Tied Inverters
摘要： This paper proposes a novel configuration for high gain, high efficiency dc–dc converter comprising a single switch, two intermediate capacitors, and a coupled inductor for low voltage solar PV module fed applications. The high voltage gain is achieved by charging the intermediate capacitors through the coupled inductor in parallel and discharging in series. In a two winding coupled inductor, considered in the presented work, maximum two intermediate capacitors can be integrated with the secondary winding. A passive lossless clamped circuit is also provided in the converter, which recovers the leakage energy to improve the efficiency and alleviate large voltage spike. The structure of the circuit is such that the power device voltage stress is reduced thereby increasing the efficiency. The maximum power point tracking at various irradiation levels is implemented in the proposed converter. Laboratory prototype of a 300-W system with 30–45-V input and 700-V output was built to validate the theoretical claims. All the detailed analysis, simulation, and experimental waveforms are presented. A maximum converter efficiency of around 95% is achieved.
关键词： maximum power point tracking (MPPT),switched capacitor,solar PV,coupled inductor,dc micro-grid,step-up,high efficiency,3-φ inverter,low voltage,high gain,dc–dc converters
更新于2025-09-23 15:22:29
-
[IEEE 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC) - Shenzhen, China (2018.11.4-2018.11.7)] 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC) - A 25kW SiC Universal Power Converter Building Block for G2V, V2G, and V2L Applications
摘要： This paper presents a universal power converter building block (PCBB) with isolation transformer which can perform various functionalities such as charging (G2V), vehicle to grid (V2G) regenerative capability, and vehicle to load (V2L) feature. This converter can output different types of voltage, such as AC or DC, high voltage or low voltage, single-phase or three-phase. With different combinations of modularized PCBB, various voltage and power rating can also be achieved. The control algorithms for each operation mode are explained, including G2V, V2G, and V2L. Simulation results are accompanied to validate its capability. To achieve high power density, SiC MOSFET power module with high frequency switching is adopted along with the isolation transformer of nanocrystalline core. Overall, this paper extends a promising circuit topology of multiple practical and essential features for vehicle electrification.
关键词： Vehicle to Grid (V2G),Dual Active Bridge,Vehicle to Load (V2L),Solid State Transformer,Bidirectional DC/DC,On-board Charger,Electric Vehicle
更新于2025-09-23 15:22:29
-
Sizing and improved grid integration of residential PV systems with heat pumps and battery storage systems
摘要： In the future, the remuneration of photovoltaic (PV) grid feed-in might significantly drop in Germany and questions arise if small-scale PV systems remain economically attractive. However, battery storage systems (BSSs) and sector coupling with heat pumps (HPs) provide promising opportunities to increase PV self-consumption and the value of local energy generation, but change the dynamics of PV grid integration. Thus, an optimization model is proposed to enable all involved stakeholders to analyze interdependencies between different flexibility options for PV systems, incentive and grid integration. A case study-based approach allows an efficient evaluation of future PV systems with BSSs and HPs, the impact of such decentralized power-heat-storage systems on grid integration as well as proper incentive setting for sector coupling. The analysis shows that such shifting technologies are required to avoid undersizing of PV systems. BSSs only provide a benefit for the adoption of inflexible HPs, which is not preferable from a grid integration point of view. Operational incentives, such as peak charges and PV feed-in limits, offer a chance to foster PV grid integration and use new flexibilities in a grid-supporting way. The adoption of market-oriented operation leads to small benefit for such systems, which heavily rely on PV self-consumption.
关键词： Power system planning,Heat pumps,Battery storage systems,Photovoltaic systems,Grid integration
更新于2025-09-23 15:22:29
-
LLMLF based Control Approach and LPO MPPT Technique for Improving Performance of a Multifunctional Three-Phase Two-Stage Grid Integrated PV System
摘要： This study presents a novel Leaky Least Mean Logarithmic Fourth (LLMLF) based control technique and Learning based Perturb and Observe (LPO) maximum power point tracking (MPPT) algorithm, for optimal control of grid-tied solar photovoltaic (PV) system. Here, a novel LLMLF algorithm is developed for active component extraction from load current, and a novel LPO MPPT algorithm is developed for optimal MPPT operation. Proposed LPO is the improved form of Perturb and Observe (P&O) algorithm, where inherent problems of traditional P&O algorithm like steady-state oscillation, slow dynamic responses and fixed step size issues, are successfully mitigated. The prime objective of proposed LLMLF control is to, fulfill the active power requirement of the loads from generated solar PV power, and excess power is fed to the grid. However, when generated PV power is less than the required load power, then LLMLF fulfills the load by taking extra required power from the grid. During this process, power quality is improved at the grid. The controller action provides reactive power compensation, power factor correction, harmonics filtering and mitigation of other power quality issues. Moreover, when the solar irradiation is zero, than the DC link capacitor and VSC act as DSTATCOM (Distribution Static Compensator), which enhances the utilization factor of the system. The proposed techniques are modeled and their performances are verified experimentally on a developed prototype, in solar insolation variation condition, imbalance loading condition for linear/nonlinear loads, as well as in different grid disturbances such as over-voltage, under-voltage, phase imbalance, harmonics distortion in the grid voltage etc, where it has shown a very good performance.
关键词： Leaky Least Mean Logarithmic Fourth Control,Solar PV array,Grid Integrated,Power Quality,DSTATCOM
更新于2025-09-23 15:22:29
-
[IEEE 2018 International Ural Conference on Green Energy (UralCon) - Chelyabinsk (2018.10.4-2018.10.6)] 2018 International Ural Conference on Green Energy (UralCon) - Concepts of Solar Batteries Integration in Linear Infrastractural Objects
摘要： Land and maintenance costs are often underestimated in solar power costs evaluation, but those become more significant as solar cell prices go down. A shared use of land, infrastructure and maintenance can both reduce the solar electricity price and boost new infrastructure projects by supplying the demanded power and acceleration of investment return. We considered the possible technical, economic and social benefits of PV integration in railroads and powerlines. Some of the conclusions could be also expanded to other linear structures, demanding land alienation (pipe lines, highways, etc.). Own energy generation could significantly reduce the investment return period of such infrastructure. A possibility of getting high DC voltages in PV systems directly could be the most demanded in the 1.5 and 3 kVDC powered railroads. The application of solar batteries could also significantly improve railroads embankment stabilization in permafrost regions, which becomes more pronounced in connection with global warming and Arctic regions development.
关键词： solar batteries,distributed generation,shared use,grid-tied,land use
更新于2025-09-23 15:22:29
-
[IEEE 2018 IEEE International Conference on Computer and Communication Engineering Technology (CCET) - Beijing, China (2018.8.18-2018.8.20)] 2018 IEEE International Conference on Computer and Communication Engineering Technology (CCET) - Lightweight Security Signaling Mechanism in Optical Network for Smart Power Grid
摘要： The communication security issue brought by Smart Grid is of great importance and should not be ignored in backbone optical networks. With the aim to solve this problem, this paper firstly conducts deep analysis into the security challenge of optical network under smart power grid environment and proposes a so-called lightweight security signaling mechanism of multi-domain optical network for Energy Internet. The proposed scheme makes full advantage of current signaling protocol with some necessary extensions and security improvement. Thus, this lightweight security signaling protocol is designed to make sure the end-to-end trusted connection. Under the multi-domain communication services of smart power grid, evaluation simulation for the signaling interaction is conducted. Simulation results show that this proposed approach can greatly improve the security level of large-scale multi-domain optical network for smart power grid with better performance in term of connection success rate performance.
关键词： Smart grid,security signaling,signaling encryption,multi-domain optical network,trusted connection
更新于2025-09-23 15:22:29