scholarly journals An integrated market solution to enable active distribution network to provide reactive power ancillary service using transmission–distribution coordination

2021 ◽  
Author(s):  
Houhe Chen ◽  
Haoyuan Li ◽  
Chuqiao Lin ◽  
Xiaolong Jin ◽  
Rufeng Zhang ◽  
...  
Keyword(s):  
Reactive Power ◽  
Distribution Network ◽  
Ancillary Service ◽  
Active Distribution Network

scholarly journals Two-Stage Active and Reactive Power Coordinated Optimal Dispatch for Active Distribution Network Considering Load Flexibility

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5922
Author(s):  
Yu Zhang ◽  
Xiaohui Song ◽  
Yong Li ◽  
Zilong Zeng ◽  
Chenchen Yong ◽  
...  
Keyword(s):  
Real Time ◽  
Prediction Error ◽  
Reactive Power ◽  
Distribution Network ◽  
Constant Current ◽  
Economic Losses ◽  
Time Varying ◽  
Two Stage ◽  
Active Distribution Network ◽  
Active And Reactive Power

A high proportion of renewable energy connected to the power grid has caused power quality problems. Voltage-sensitive loads are extremely susceptible to voltage fluctuations, causing power system safety issues and economic losses. Considering the uncertainty factor and the time-varying characteristic, a linearized random ZIP model (constant impedance (Z), constant current (I), and constant power (P)) with time-varying characteristics was proposed. In order to improve the voltage quality of the voltage-sensitive loads in the day-here stage in an active distribution network (ADN), a linearized two-stage active and reactive power coordinated stochastic optimization model was established. The day-ahead active and reactive power coordination optimization was to smooth the large voltage fluctuation and develop a reserve plan to eliminate the unbalanced power caused by the prediction error in the day-here optimization. In the day-here real-time redispatch, the voltage was further improved by the continuous reactive power compensation device. Finally, the simulation results on the IEEE-33 bus system showed that the control strategy could better eliminate the unbalanced power caused by the prediction error and obviously improve the voltage of sensitive loads in the real-time stage on the premise of maintaining economic optimality.

scholarly journals Dynamic Coordinated Active–Reactive Power Optimization for Active Distribution Network with Energy Storage Systems

2019 ◽  
Vol 9 (6) ◽  
pp. 1129 ◽  
Author(s):  
Lingling Wang ◽  
Xu Wang ◽  
Chuanwen Jiang ◽  
Shuo Yin ◽  
Meng Yang
Keyword(s):  
Energy Storage ◽  
Reactive Power ◽  
Storage Systems ◽  
Distribution Network ◽  
Mixed Integer ◽  
Reactive Power Optimization ◽  
Power Losses ◽  
Energy Storage Systems ◽  
Active Distribution Network ◽  
Second Order Cone

This paper proposes a coordinated active–reactive power optimization model for an active distribution network with energy storage systems, where the active and reactive resources are handled simultaneously. The model aims to minimize the power losses, the operation cost, and the voltage deviation of the distribution network. In particular, the reactive power capabilities of distributed generators and energy storage systems are fully utilized to minimize power losses and improve voltage profiles. The uncertainties pertaining to the forecasted values of renewable energy sources are modelled by scenario-based stochastic programming. The second-order cone programming relaxation method is used to deal with the nonlinear power flow constraints and transform the original mixed integer nonlinear programming problem into a tractable mixed integer second-order cone programming model, thus the difficulty of problem solving is significantly reduced. The 33-bus and 69-bus distribution networks are used to demonstrate the effectiveness of the proposed approach. Simulation results show that the proposed coordinated optimization approach helps improve the economic operation for active distribution network while improving the system security significantly.

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