scholarly journals Battery Storage Integration in Voltage Unbalance and Overvoltage Mitigation Control Strategies and Its Impact on the Power Quality

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1501 ◽  
Author(s):  
Dimitar Bozalakov ◽  
Mohannad J. Mnati ◽  
Joannes Laveyne ◽  
Jan Desmet ◽  
Lieven Vandevelde
Keyword(s):  
Energy Storage ◽  
Power Quality ◽  
Control Strategy ◽  
Control Strategies ◽  
Storage System ◽  
Energy Storage System ◽  
Voltage Unbalance ◽  
Phase Damping ◽  
Damping Control ◽  
Three Phase

The increased utilisation of distributed renewable energy sources in low voltage grids leads to power quality problems such as overvoltages and voltage unbalance. This imposes challenges to the distribution system operators to maintain the power quality in their grids. To overcome these issues, energy storage systems could be integrated together with the distributed energy resources and the stored energy could be used when needed to better improve power quality and achieve better grid performance. However, integrating an energy storage system introduces additional cost, therefore, determining the right capacity is essential. In this article, an energy storage system is combined with the classical positive-sequence control strategy and the three-phase damping control strategy. The three-phase damping control strategy is able to mitigate the voltage unbalance by emulating a resistive behaviour towards the zero- and negative-sequence voltage components. This resistive behaviour can be set on different values such that the desired voltage unbalance mitigation is achieved. Hence, the three-phase damping control strategy, equipped with the energy storage system is investigated under different values of the resistive behaviour. Both control strategies are investigated under the same conditions and the impact of the different capacities of the energy storage systems is investigated.

scholarly journals Possible Power Quality Ancillary Services in Low-Voltage Grids Provided by the Three-Phase Damping Control Strategy

2020 ◽  
Vol 10 (21) ◽  
pp. 7876
Author(s):  
Dimitar V. Bozalakov ◽  
Joannes Laveyne ◽  
Mohannad J. Mnati ◽  
Jan Van de Vyver ◽  
Lieven Vandevelde
Keyword(s):  
Power Quality ◽  
Control Strategy ◽  
Distribution System ◽  
Low Voltage ◽  
Control Strategies ◽  
Ancillary Services ◽  
Phase Damping ◽  
Damping Control ◽  
Three Phase ◽  
System Operator

The share of renewable energy is increasing because of environmental concerns and favorable economic conditions. The majority of the distributed energy resources, connected to the low-voltage grid, are inverter-connected units. These inverters are controlled by using specially developed control strategies to determine the power injection between the primary source and the grid. In the past, the connection of distributed energy resources was based on the connect-and-forget principle, but this approach leads to severe power quality problems. Nowadays, more sophisticated control strategies need to be developed, so that ancillary services can be provided to the distribution system operator, which will allow further increase of renewable share in the distribution grids. This article examines the technical capabilities of the three-phase damping control strategy to provide ancillary services to the distribution system operator. Besides the three-phase damping control strategy, the article also compares the classical positive-sequence control strategy. Active power drooping and reactive power exchange are combined with these control strategies and the effect on the annual energy production, power quality, and grid performance is assessed. The simulations are conducted on a Matlab/OpenDSS platform in a time series simulations.

scholarly journals Equalization control strategy of medium voltage direct hanging energy storage system

2020 ◽  
Vol 185 ◽  
pp. 01085
Author(s):  
Guanjun Li ◽  
Haoyuan Li ◽  
Fubao Wu ◽  
Shi Yin
Keyword(s):  
Energy Storage ◽  
Control Strategy ◽  
Control Strategies ◽  
Storage System ◽  
High Capacity ◽  
Capacity Utilization ◽  
Energy Storage System ◽  
Battery Life ◽  
Medium Voltage ◽  
Power Frequency

The medium voltage direct hanging energy storage system has been widely used in high capacity applications, which gets rid of power frequency transformer and is of high conversion efficiency. This paper introduces the medium voltage direct hanging energy storage system topology scheme. In order to improve the battery life and capacity utilization, the in-phase and inter-phase battery equalization control strategies are studied. Finally, the simulation results on medium voltage direct hanging energy storage system prove the correctness and effectiveness of the equalization control strategy.

scholarly journals Charging–Discharging Control Strategy for a Flywheel Array Energy Storage System Based on the Equal Incremental Principle

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2844 ◽  
Author(s):  
Changli Shi ◽  
Tongzhen Wei ◽  
Xisheng Tang ◽  
Long Zhou ◽  
Tongshuo Zhang
Keyword(s):  
Energy Storage ◽  
High Power ◽  
Control Strategy ◽  
Control Strategies ◽  
Storage System ◽  
Coordinated Control ◽  
Energy Storage System ◽  
Coordination Control ◽  
Flywheel Energy Storage ◽  
Specific Implementation

The widely used flywheel energy storage (FES) system has such advantages as high power density, no environment pollution, a long service life, a wide operating temperature range, and unlimited charging–discharging times. The flywheel array energy storage system (FAESS), which includes the multiple standardized flywheel energy storage unit (FESU), is an effective solution for obtaining large capacity and high-power energy storage. In this paper, the strategy for coordinating and controlling the charging–discharging of the FAESS is studied in depth. Firstly, a deep analysis is conducted on the loss generated during the charging–discharging process of the FESU. The results indicate that the loss is related to the charging–discharging of power. To solve the problems of over-charging, over-discharging, and overcurrent caused by traditional charging–discharging control strategies, this paper proposes a charging–discharging coordination control strategy based on the equal incremental principle (EIP). This strategy aims to minimize the total loss and establish a mathematical model of optimal coordination control with the constraints of total charging–discharging power, rated power limit, over-charging, over-discharging, and overcurrent. Based on the EIP, the optimal distribution scheme of power charging–discharging is determined. Secondly, this paper gives the specific implementation scheme of the optimal coordinated control strategy. Lastly, the charging–discharging coordinated control strategy is verified by examples. The results show that the coordinated control strategy can effectively reduce the loss during the charging–discharging process and can prevent over-charging, over-discharging, and overcurrent of the system. Overall, it has a better control effect than the existing charging–discharging control strategies.

scholarly journals Stratification Analysis and Behaviour of a Real Industrial Thermocline Thermal Energy Storage Tank for Cogeneration Purposes

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 120
Author(s):  
Francisco Fernández ◽  
José Díaz ◽  
María Folgueras ◽  
Inés Suárez
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Control Strategies ◽  
Storage System ◽  
Good Control ◽  
Energy Storage System ◽  
Temperature Gradients ◽  
Operation Conditions ◽  
Mean Temperature

Thermal energy storage systems help to couple thermal energy generation and process demand in cogeneration facilities. One single deposit with two design temperatures and one main temperature step in sensible thermal energy storage define the thermocline systems. Performance of one high size real thermocline thermal energy storage system is analysed. Starting from temperature and mass flow rate data registered by the plant control system, one advanced thermodynamic analysis is performed. The quality of heat storage is analysed in terms of evaluation of the stratification in the thermocline zone. The temperature data registered at 21 positions is extended by displacement analysis generating detailed profiles. Fraction of recoverable heat, thermocline width, stratification indices based on energy and exergy analysis, and mean temperature gradients in the thermocline region are calculated. These parameters are monitored under real operation conditions of the plant. The calculated parameters are studied to check their distribution and correlation. First and Second Law indices show parallel behaviour and two values are found that delimit situations of high and low values of mean temperature gradients. It was observed that buoyancy generates uniform forced movement with the right water temperature entering the diffusers, but good control strategies are essential to avoid mixing. The system demonstrated great stability in this use.

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