scholarly journals Reactive Power Optimization for Transient Voltage Stability in Energy Internet via Deep Reinforcement Learning Approach

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1556 ◽  
Author(s):  
Cao ◽  
Zhang ◽  
Xiao ◽  
Hua
Keyword(s):  
Decision Making ◽  
Reinforcement Learning ◽  
Voltage Stability ◽  
Reactive Power ◽  
Learning Approach ◽  
Strong Impact ◽  
Reactive Power Optimization ◽  
Energy Internet ◽  
Transient Voltage Stability ◽  
Transient Voltage

The existence of high proportional distributed energy resources in energy Internet (EI) scenarios has a strong impact on the power supply-demand balance of the EI system. Decision-making optimization research that focuses on the transient voltage stability is of great significance for maintaining effective and safe operation of the EI. Within a typical EI scenario, this paper conducts a study of transient voltage stability analysis based on convolutional neural networks. Based on the judgment of transient voltage stability, a reactive power compensation decision optimization algorithm via deep reinforcement learning approach is proposed. In this sense, the following targets are achieved: the efficiency of decision-making is greatly improved, risks are identified in advance, and decisions are made in time. Simulations show the effectiveness of our proposed method.

scholarly journals The Voltage Regulation Control Strategy with Distributed Photovoltaic Participation under Serious Failure Based on Transient Voltage Margin

2020 ◽  
Vol 186 ◽  
pp. 01002
Author(s):  
Yunxin Liu ◽  
Liangzhong Yao ◽  
Siyang Liao ◽  
Jian Xu ◽  
Di Wu ◽  
...  
Keyword(s):  
Large Scale ◽  
Voltage Stability ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Voltage Fluctuation ◽  
Reactive Compensation ◽  
Transient Voltage Stability ◽  
Transient Voltage ◽  
Reactive Power Compensator ◽  
Weak Bus

With the poor ability of distributed PV to withstand voltage fluctuation, the voltage fluctuation caused by DC blocking can lead to large-scale disorderly de-networking of distributed PV, especially those distributed PV which close to voltage weak buses. which means that more and more attentions are paid to the transient voltage stability (TVS). If distributed PV can participation in reactive compensation, we don’t need to add additional reactive power compensator, voltage stability of voltage weak buses will be increased, which can reduce PV off-grid. Therefore, for the HVDC receiving end system under distributed PV intensive access, first of all, we need to find the voltage weak bus, then increase the reactive power output of distributed PV near the voltage weak buses to increase transient voltage margin. Taking the simplified model of power system in Anhui Province as an example, the validity of the strategy is verified, and the results show that the transient voltage stability of the system has been improved.

Control Strategy of Improving the Transient Voltage Stability of Grid-Connected Large-Scale Wind Farm

2013 ◽  
Vol 448-453 ◽  
pp. 1758-1761
Author(s):  
Jin Ling Lu ◽  
Shao Tong Shi ◽  
Yang Lu
Keyword(s):  
Control Strategy ◽  
Voltage Stability ◽  
Reactive Power ◽  
Wind Farms ◽  
Power Converter ◽  
Control Model ◽  
Pitch Control ◽  
Transient Voltage Stability ◽  
Transient Voltage ◽  
Voltage Support

Because mostly used variable speed wind turbines based on doubly fed induction generator (DFIG) do not provide with transient voltage support capability under fault conditions, the security and stability of grid is influenced by wind farms integration in the case of severe short circuit fault contingency occurred on the grid side. The modified power converter controller model with transient voltage support capability and pitch control model used for post-fault stability control are implemented in DIgSILENT/PowerFactory. The models validation and the contribution to transient voltage stability enhancement are verified by power system simulation containing large wind farms. From simulation results, it can be illustrated that modified power converter controller with transient voltage support capability can provide dynamic reactive power to support grid voltage recovery and the modified pitch control model can reduce mechanical power , preventing wind turbines from over-speeding and also providing more reactive power generation stability for the power converter controller in the duration of power system large disturbance. The conclusion is presented that the control strategy can effectively improve the transient voltage stability of the gird.

The Review of Grid-Connected PV System’s Transient Voltage Stability

2012 ◽  
Vol 182-183 ◽  
pp. 681-684
Author(s):  
You Jie Ma ◽  
Cheng Liao ◽  
Xue Song Zhou
Keyword(s):  
Stability Criterion ◽  
Distribution System ◽  
Voltage Stability ◽  
Reactive Power ◽  
Photovoltaic System ◽  
System Load ◽  
Voltage Instability ◽  
Simulation Calculation ◽  
Transient Voltage Stability ◽  
Transient Voltage

Grid photovoltaic system’s inverter, grid device and other power electronics device consume a large quantity of reactive power, the distribution system load mostly is perceptual, it must also consume reactive power. This will make big interference interconnection of photovoltaic system after the transient voltage stability serious test. Therefore, the study grid photovoltaic system transient voltage stability is of great significance. This paper introduces the transient voltage stability of research contents, such as transient voltage stability of factors, stability criterion, the simulation calculation, and puts forward prevention transient voltage instability accident measures, and analyzes system transient voltage stability mechanism.

scholarly journals Transient Voltage Stability of UHV DC/AC Hybrid Power Grids with Spinning Reserve

2020 ◽  
Vol 185 ◽  
pp. 01016
Author(s):  
Ting Cui ◽  
Ding Wang ◽  
Zhen Hu ◽  
Yangwu Shen ◽  
Hu Guo
Keyword(s):  
Voltage Stability ◽  
Reactive Power ◽  
Power Grid ◽  
Power Grids ◽  
Synchronous Generators ◽  
Spinning Reserve ◽  
Hybrid Power ◽  
Received Power ◽  
Transient Voltage Stability ◽  
Transient Voltage

This paper studies the mechanism of spinning reserve on transient voltage stability in ultra-high voltage (UHV) DC/AC hybrid power grids. Taking an actual received power grid with an UHVDC system as an example, the transient voltage stability is introduced and a certain scale of spinning reserve has to be retained to keep the transient voltage stability of the system. And then, the steady state of synchronous generators with different spinning reserve is studied using the method of phasor diagram analysis. At last, the relation of spinning reserve, excitation voltage, and dynamic reactive power is analyzed and the mechanism of spinning reserve on transient voltage stability is revealed. The actual received power grid is used to demonstrate the validity of the mechanism.

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