Voltage Equalization Optimization Strategy for Storage Battery of Power Grid

2021 ◽  
Author(s):  
Dong Yuyin ◽  
Li Fenghai ◽  
Li Weijie ◽  
Wei Heyu
Keyword(s):  
Power Grid ◽  
Storage Battery ◽  
Optimization Strategy

scholarly journals Energy-Storage Optimization Strategy for Reducing Wind Power Fluctuation via Markov Prediction and PSO Method

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3393 ◽  
Author(s):  
Pingping Yun ◽  
Yongfeng Ren ◽  
Yu Xue
Keyword(s):  
Energy Storage ◽  
Wind Power ◽  
Large Scale ◽  
Wind Farm ◽  
Power Grid ◽  
Optimal Operation ◽  
Storage Battery ◽  
Optimization Strategy ◽  
Power Fluctuation ◽  
The Impact

Wind power penetration ratios of power grids have increased in recent years; thus, deteriorating power grid stability caused by wind power fluctuation has caused widespread concern. At present, configuring an energy storage system with corresponding capacity at the grid connection point of a large-scale wind farm is an effective solution that improves wind power dispatchability, suppresses potential fluctuations, and reduces power grid operation risks. Based on the traditional energy-storage battery dispatching scheme, in this study, a multi-objective hybrid optimization model for joint wind-farm and energy-storage operation is designed. The impact of two new aspects, the energy-storage battery output and wind-power future output, on the current energy storage operation are considered. Wind-power future output assessment is performed using a wind-power-based Markov prediction model. The particle swarm optimization algorithm is used to optimize the wind-storage grid-connected power in real time, to develop an optimal operation strategy for an energy storage battery. Simulations incorporating typical daily wind power data from a several-hundred-megawatt wind farm and rolling optimization of the energy storage output reveal that the proposed method can reduce the grid-connected wind power fluctuation, the probability of overcharge and over-discharge of the stored energy, and the energy storage dead time. For the same smoothing performance, the proposed method can reduce the energy storage capacity and improve the economic efficiency of the wind-storage joint operation.

Analysis of UHV Power Grid Operation and Maintenance System Construction and Optimization Strategy - Taking Shan-Xi UHV Grid as an Example

2014 ◽  
Vol 960-961 ◽  
pp. 1108-1111
Author(s):  
Ding Qiang Duan ◽  
Li Ting Jiao
Keyword(s):  
Power Grid ◽  
System Construction ◽  
Optimization Strategy ◽  
Power Company ◽  
Operation And Maintenance ◽  
Speed Up ◽  
Control Requirement ◽  
Grid Operation ◽  
Automation Technology

Compared with the traditional power grid, UHV power grid has the character of stronger system function, higher control requirement, and also set a higher request to the daily maintenance management. The operation and maintenance experience of Shan-xi province electric power company on the UHV power grid proved the importance of establishing the new mode of management, strengthening the application of automation technology, and guarenteeing the technology and resources . In order to improve the efficience and quality of UHV power grid operation and maintenance, we should speed up the formulation of operation guidelines for UHV live working and strengthen personnel training and reserve technical talents.

scholarly journals Adaptive Droop Coefficient and SOC Equalization-Based Primary Frequency Modulation Control Strategy of Energy Storage

Electronics ◽  
2021 ◽  
Vol 10 (21) ◽  
pp. 2645
Author(s):  
Gaojun Meng ◽  
Yang Lu ◽  
Haitao Liu ◽  
Yuan Ye ◽  
Yukun Sun ◽  
...  
Keyword(s):  
Energy Storage ◽  
Frequency Modulation ◽  
Control Strategy ◽  
Simulation Analysis ◽  
Power Grid ◽  
Frequency Regulation ◽  
Storage Battery ◽  
Load Disturbance ◽  
Modulation Control ◽  
Primary Frequency

In order to efficiently use energy storage resources while meeting the power grid primary frequency modulation requirements, an adaptive droop coefficient and SOC balance-based primary frequency modulation control strategy for energy storage is proposed. Taking the SOC of energy storage battery as the control quantity, the depth of energy storage output is adaptively adjusted to prevent the saturation or exhaustion of energy storage SOC. The balanced control strategy is introduced to realize the rational utilization of resources and the fast balance of SOC in the process of primary frequency modulation of energy storage battery under different charge states. Then, four evaluation indexes are proposed to evaluate the effect of primary frequency modulation and SOC maintenance. Taking a regional power grid as an example, a simulation analysis is carried out under step load disturbance and continuous load disturbance. According to the simulation results, the proposed control strategy is effective in power system frequency regulation and battery SOC maintenance.

scholarly journals Research on Load Recovery Optimization Strategy Based on Power Grid Partition

2019 ◽  
Vol 300 ◽  
pp. 042111
Author(s):  
Yingzhe Huo ◽  
Ting Wang ◽  
Qun Wang ◽  
Fei Xia ◽  
Xiaohua Yin ◽  
...  
Keyword(s):  
Power Grid ◽  
Optimization Strategy ◽  
Grid Partition

scholarly journals Optimization Strategy of SVC for Eliminating Electromagnetic Oscillation in Weak Networking Power Systems

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3489
Author(s):  
Huabo Shi ◽  
Xinwei Sun ◽  
Gang Chen ◽  
Hua Zhang ◽  
Yonghong Tang ◽  
...  
Keyword(s):  
Parameter Optimization ◽  
Short Circuit ◽  
Power Grid ◽  
Oscillation Mode ◽  
Voltage Regulation ◽  
Optimization Strategy ◽  
Long Distance ◽  
Large Power ◽  
Electromagnetic Oscillation ◽  
Long Distance Transmission

The central Tibet AC interconnection project (CTAIP), which connects the Tibet power grid and the Sichuan power grid through a long distance transmission line of more than 1400 km, has a significant problem of voltage regulation. In order to improve the voltage regulation performance, six sets of ±60 Mvar static VAR compensators (SVC) were installed in the CTAIP. However, the SVCs may lead to electromagnetic oscillation below 50 Hz while improving voltage regulation capability. In this paper, the electromagnetic oscillation modes and the sensitivity of control parameters of SVC are analyzed. Then, the characteristics and influencing factors of the oscillation are discussed. It was found that there is an inherent electromagnetic oscillation mode below 50 Hz in the ultra-long distance transmission system. The employ of SVCs weaken the damping of this mode. Large proportional gain and integral gain (PI) parameters of SVCs can improve the voltage regulation performance, but weaken the electromagnetic oscillation mode damping. Therefore, a suppression method based on SVC PI parameters optimization is proposed to damp the oscillation. The essential of this method is to use the rising time of voltage response and setting time of SVCs as performance indicators of voltage regulation, and take the damping level of the electromagnetic oscillation mode as the performance index of SVC electromagnetic oscillation suppression ability. Combining the two indicators to form a comprehensive optimization index function, an intelligent optimization algorithm is applied. The process of SVC parameter optimization and the steps of multi-SVC parameter optimization in large power grids is proposed. Finally, PSCAD and real-time digital simulation (RTDS) simulation results verified the correctness of the proposed method. The optimization strategy was applied to CTAIP. The artificial grounding short circuit experimental results proved the effectiveness of the proposed strategy.

The Analysis of Strategies for Large Thermal Power Unit Frequency Control after the Breakdown of Isolated Network in Sending-End Network

2013 ◽  
Vol 392 ◽  
pp. 646-650
Author(s):  
Hao Wang ◽  
Qing Wang ◽  
He Huang ◽  
Yong Zhang ◽  
Yun Ting Song ◽  
...  
Keyword(s):  
Power Unit ◽  
High Frequency ◽  
Frequency Control ◽  
Power Grid ◽  
Thermal Power ◽  
Load Shedding ◽  
High Rate ◽  
Optimization Strategy ◽  
Lower Amplitude ◽  
Primary Frequency

As for the hidden dangers of low-frequency load shedding caused by high frequency generator tripping in isolated power grid because of the failure connection between outward transmission district grid and leadership grid, we gave an analysis to problems with high-frequency in sending network and isolated power grid, and reasons causing the unmatching between OPC and governors. Then, we adopted the measured parameters of thermal power units for the analysis of its regulating system under the isolated power grid, and discussed the regulating effect when the lower amplitude of the primary frequency was-30% and full liberalization. As for the high rate of load shedding in the sending network, this paper has put forward an optimization strategy for thermal power unit frequency control in isolated network. Release primary frequency amplitude to-30% in isolated network, measure the acceleration of rotation speed when OPC acts at the first time, calculate the tragic power of the unit and send it to AGC system. The unit quickly adjusts the power of the unit according to new AGC instruction, and stabilizes the frequency in isolated network. This strategy can help to realize the coordination between OPC and speed governor, and improve the margin of high-frequency in isolated network.

scholarly journals Characteristic Analysis and Optimal Regulation of Primary Frequency Regulation Condition in Low Water Head Area Based on Hydraulic-Mechanical-Electrical Coupling Model of Pumped Storage Unit

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-17 ◽  
Author(s):  
Cong Lv ◽  
Yanhe Xu ◽  
Xin Wu ◽  
Qing Zhang
Keyword(s):  
Power Grid ◽  
Electrical Coupling ◽  
Frequency Regulation ◽  
Regulation System ◽  
Optimization Strategy ◽  
Power Station ◽  
Storage Unit ◽  
Pump Turbine ◽  
Pumped Storage ◽  
Primary Frequency

Pumped storage power station is an important regulating tool for peak load regulation and frequency regulation of the power grid, especially its primary frequency regulation function, which is of profound significance for the safety and stability of the power grid. As the core equipment of the pumped storage power station, the reversible design of the pump turbine makes it easy to have hydraulic fluctuation and mechanical instability when the unit runs to the “S” characteristic area, which will cause the frequency oscillation of the generator under the condition of primary frequency regulation. Therefore, some innovative work is studied in this paper: (1) an accurate hydraulic-mechanical-electrical coupling system mathematical model of pumped storage unit regulation system (PSURS) is established based on full characteristic curve of the pump turbine and seventh-order synchronous generator and excitation system; (2) the dynamic response characteristics of primary frequency regulation of pumped storage unit (PSU) under different water heads and different frequency disturbances are analyzed by numerical simulation; (3) in view of the unstable condition of the unit under the large frequency disturbance when it operates in the low head and small load area, the objective optimization function considering the ITAE index of hydraulic, mechanical, and electrical factors is proposed; and (4) fractional-order PID controller and the bacterial-foraging chemotaxis gravitational search algorithm (BCGSA) combined optimization strategy is used for PSURS optimization regulation and parameter optimization. The results show that the joint optimization strategy proposed in this paper has smaller objective function value, and makes the PSURS pass through the unbalanced area quickly, with better primary frequency regulation speed and smaller regulation depth.

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