scholarly journals Real-Time Dispatch of Coupled Transmission and Distribution Systems within a Distributed and Cooperative Framework

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5281
Author(s):  
Lingshu Zhong ◽  
Lin Guan
Keyword(s):  
Power Control ◽  
Real Time ◽  
Distribution System ◽  
Cooperative Control ◽  
Distribution Systems ◽  
Control Method ◽  
Active Power ◽  
Renewable Energy Consumption ◽  
Active Power Control ◽  
Transmission And Distribution

This paper presents a real-time dispatch strategy for coupled transmission and distribution systems within a distributed and cooperative control framework to maintain reliable and secure operation with minimum generation costs and maximum renewable energy consumption. The presented strategy transforms each distribution system into a dispatchable active source via an average-consensus-based active power control of renewable distributed energy resources (DERs) at the distribution level and then dispatches the active power reference of conventional generators as well as the distribution systems in a measurement-based way at a transmission level. The voltage fluctuation caused by the DER active power control is smoothened with a distributed voltage control method, which can also reduce the active power loss in the distribution systems. Compared to existing real-time dispatch strategies, the proposed strategy can eliminate security issues in the transmission system in a short time by regulating large amounts of DERs at a distribution level in a simple and easy controlled structure, in which the differences in the communication conditions and privacy requirements between the distribution and transmission systems are adequately considered.

scholarly journals Decentralised Active Power Control Strategy for Real-Time Power Balance in an Isolated Microgrid with an Energy Storage System and Diesel Generators

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 511 ◽  
Author(s):  
Hyeon-Jin Moon ◽  
Young Jin Kim ◽  
Jae Won Chang ◽  
Seung-Il Moon
Keyword(s):  
Energy Storage ◽  
Power Control ◽  
Real Time ◽  
Control Method ◽  
Renewable Energy Sources ◽  
Active Power ◽  
Power Balance ◽  
Active Power Control ◽  
Diesel Generators ◽  
Continuous Power

Remote microgrids with battery energy storage systems (BESSs), diesel generators, and renewable energy sources (RESs) have recently received significant attention because of their improved power quality and remarkable capability of continuous power supply to loads. In this paper, a new proportional control method is proposed using frequency-bus-signaling to achieve real-time power balance continuously under an abnormal condition of short-term power shortage in a remote microgrid. Specifically, in the proposed method, the frequency generated by the grid-forming BESS is used as a global signal and, based on the signal, a diesel generator is then controlled indirectly. The frequency is controlled to be proportional to the AC voltage deviation of the grid-forming BESS to detect sudden power shortages and share active power with other generators. Unlike a conventional constant-voltage constant-frequency (CVCF) control method, the proposed method can be widely applied to optimise the use of distributed energy resources (DERs), while maintaining microgrid voltages within an allowable range, particularly when active power balance cannot be achieved only using CVCF control. For case studies, a comprehensive model of an isolated microgrid is developed using real data. Simulation results are obtained using MATLAB/Simulink to verify the effectiveness of the proposed method in improving primary active power control in the microgrid.

scholarly journals Adaptive Multi-Model Switching Predictive Active Power Control Scheme for Wind Generator System

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1329 ◽  
Author(s):  
Hongwei Li ◽  
Kaide Ren ◽  
Shuaibing Li ◽  
Haiying Dong
Keyword(s):  
Power Generation ◽  
Model Predictive Control ◽  
Power Control ◽  
Wind Power ◽  
Predictive Control ◽  
Control Method ◽  
Measured Data ◽  
Active Power ◽  
Wind Power Generation ◽  
Active Power Control

To deal with the randomness and uncertainty of the wind power generation process, this paper proposes the use of the clustering method to complement the multi-model predictive control algorithm for active power control. Firstly, the fuzzy clustering algorithm is adopted to classify actual measured data; then, the forgetting factor recursive least square method is used to establish the multi-model of the system as the prediction model. Secondly, the model predictive controller is designed to use the measured wind speed as disturbance, the pitch angle as the control variable, and the active power as the output. Finally, the parameters and measured data of wind generators in operation in Western China are adopted for simulation and verification. Compared to the single model prediction control method, the adaptive multi-model predictive control method can yield a much higher prediction accuracy, which can significantly eliminate the instability in the process of wind power generation.

scholarly journals Active Power Control of Grid tied PV system using Fuzzy Controller

2020 ◽  
pp. 1-4
Author(s):  
P Ankineedu Prasad and Y Lakshmi
Keyword(s):  
Power Systems ◽  
Power Control ◽  
Control Method ◽  
Fuzzy Controller ◽  
Storage System ◽  
Active Power ◽  
Electric Power System ◽  
Frequency Regulation ◽  
Pv System ◽  
Active Power Control

Historically, electric power system operators have seen photovoltaic (PV) power systems as potential sources of problems due to intermittency and lack of controllability. However, the flexibility of power electronic inverters allows PV to provide grid-friendly features including volt-VAR control, ramp-rate control, high-frequency power curtailment, and event ride-through. Commercially available smart PV inverters can further provide frequency down-regulation by curtailing power, but they are unable to provide true frequency regulation through active power control (APC) because they are unable to increase power on command. This paper proposes a coordinated DC-link voltage control and deloading control for two-stage PV system to offer frequency support in an islanded microgrid without energy storage system (ESS). This paper proposes a predictive fuzzy logic based PV inverter control method for very fast and accurate control of active power

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