scholarly journals MODELING OF DVSI WITH HYBRID ENERGY SYSTEM AND VOLTAGE OPTIMIZER ACTIVE POWER CONTROLLER

2019 ◽  
Vol 5 (6) ◽  
pp. 10
Author(s):  
Monika Pawar ◽  
Santosh Kumar
Keyword(s):  
Power Control ◽  
Control Strategy ◽  
Renewable Energy Sources ◽  
Energy System ◽  
Phase Locked Loop ◽  
Voltage Regulation ◽  
Active Power ◽  
Active Power Control ◽  
Loop Control ◽  
Power Controller

Technological progress and environmental concerns drive the power system to a paradigm shift with more renewable energy sources integrated to the network by means of distributed generation (DG). These DG units with coordinated control of local generation and storage facilities form a micro grid. A voltage regulation and power flow control scheme for a wind energy system (WES) WITH solar system is proposed. The simulation result shows that the system with the proposed voltage optimizer active power control strategy proposed is better as compared to the basic phase locked loop control. Also the system was made efficient by integrating it with the wind system and making it a hybrid power source. On comparing the active power outputs from the system with phase locked loop control with proposed voltage optimizer active power control, it was found to be that the proposed system gives 4 MW output which is considerably more than the 0.5 MW output of the system with basic PLL control. Thus it can be drawn from this work that while designing an inverter control strategy the proposed voltage optimizer active power controller can serve the purpose with better results

Comparison of two control strategies for VSC-MTDC with wind farm

2021 ◽  
Vol 14 ◽  
Author(s):  
Congshan Li ◽  
Pu Zhong ◽  
Ping He ◽  
Yan Liu ◽  
Yan Fang ◽  
...  
Keyword(s):  
Power Control ◽  
Control Strategy ◽  
Voltage Stability ◽  
Wind Farm ◽  
Control Strategies ◽  
Wind Farms ◽  
Active Power ◽  
Stable Operation ◽  
Active Power Control ◽  
Dc Voltage

: Two VSC-MTDC control strategies with different combinations of controllers are proposed to eliminate transient fluctuations in the DC voltage stability, resulting from a power imbalance in a VSC-MTDC connected to wind farms. First, an analysis is performed of a topological model of a VSC converter station and a VSC-MTDC, as well as of a mathematical model of a wind turbine. Then, the principles and characteristics of DC voltage slope control, constant active power control, and inner loop current control used in the VSC-MTDC are introduced. Finally, the PSCAD/EMTDC platform is used to establish an electromagnetic transient model of a wind farm connected to a parallel three-terminal VSC-HVDC. An analysis is performed for three cases of single-phase grounding faults on the rectifier and inverter sides of a converter station and of the withdrawal of the converter station on the rectifier side. Next, the fault response characteristics of VSC-MTDC are compared and analyzed. The simulation results verify the effectiveness of the two control strategies, both of which enable the system to maintain DC voltage stability and active power balance in the event of a fault. Background: The use of a VSC-MTDC to connect wind power to the grid has attracted considerable attention in recent years. A suitable VSC-MTDC control method can enable the stable operation of a power grid. Objective: The study aims to eliminate transient fluctuations in the DC voltage stability resulting from a power imbalance in a VSC-MTDC connected to a wind farm. Method: First, the topological structure and a model of a three-terminal VSC-HVDC system connected to wind farms are studied. Second, an analysis is performed of the outer loop DC voltage slope control, constant active power control and inner loop current control of the converter station of a VSC-MTDC. Two different control strategies are proposed for the parallel three-terminal VSC-HVDC system: the first is DC voltage slope control for the rectifier station and constant active power control for the inverter station, and the second is DC voltage slope control for the inverter station and constant active power for the rectifier station. Finally, a parallel three-terminal VSC-HVDC model is built based on the PSCAD/EMTDC platform and used to verify the accuracy and effectiveness of the proposed control strategy. Results: The results of simulation analysis of the faults on the rectifier and inverter sides of the system show that both strategies can restore the system to the stable operation. The effectiveness of the proposed control strategy is thus verified. Conclusion: The control strategy proposed in this paper provides a technical reference for designing a VSC-MTDC system for wind farms.

scholarly journals A non-centralized predictive control strategy for wind farm active power control: A wake-based partitioning approach

2020 ◽  
Vol 150 ◽  
pp. 656-669
Author(s):  
Sara Siniscalchi-Minna ◽  
Fernando D. Bianchi ◽  
Carlos Ocampo-Martinez ◽  
Jose Luis Domínguez-García ◽  
Bart De Schutter
Keyword(s):  
Power Control ◽  
Predictive Control ◽  
Control Strategy ◽  
Wind Farm ◽  
Active Power ◽  
Active Power Control

scholarly journals The Reactive Power Support Strategy based on Dual-loop Control for Three-phase Grid-connected Inverter

2020 ◽  
Vol 182 ◽  
pp. 02011
Author(s):  
WAN Qian ◽  
Xia Chengjun ◽  
Azeddine Houari ◽  
Zhao Xue ◽  
Xia Chengjun ◽  
...  
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Low Voltage ◽  
Renewable Energy Sources ◽  
Active Power ◽  
Electric Power System ◽  
Pv System ◽  
Loop Control ◽  
Pv Array ◽  
Three Phase

Renewable energy sources (RESs) generally connected with electric power system via power electronic interface. This paper presents a reactive power and voltage (Q/V) control strategy of three-phase photovoltaic (PV) system to offering reactive power based on the typical dual-loop control topology. It is worth mentioning that control strategy can support reactive power when a low voltage fault occurs in AC bus without additional compensation device. With the help of the decoupling control, the PV array can generate active power as much as possible in variable external solar radiation conditions. The voltage of PV arrays is adopted as the objective, which on account of the easy availability and controllability of voltage, to control output active power. Besides, accurately modeling process from a PV cell to PV array is described in the beginning to acquire the P-V and V-I characteristics of PV arrays, which promote the designment of Q/V control.

Active Power Control Strategy with Auxiliary Frequency Regulation Function of Wind Farms

2014 ◽  
Vol 536-537 ◽  
pp. 1257-1260
Author(s):  
Guan Qi Liu ◽  
Li Na Wu
Keyword(s):  
Power Control ◽  
Control Strategy ◽  
Power Plants ◽  
Operation Mode ◽  
Wind Farms ◽  
Active Power ◽  
Normal Operation ◽  
Frequency Regulation ◽  
Active Power Control ◽  
System Frequency

The fluctuations and uncertainties of wind power increase the frequency regulation pressure of conventional power plants. This paper introduces an active power control strategy with auxiliary frequency regulation function of wind farms. With this active power control strategy, wind farms can work in normal operation mode or in auxiliary regulation mode. Wind farms in normal operation mode can trace the power command to the utmost extent. When the system frequency drops large, to respond this change, the wind farms can switch to auxiliary regulation mode automatically. Simulation results show that the wind farms can assist the conventional power plants to regulate the system frequency effectively.

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