Dynamic Performance of Reactive Power Control for Voltage Support in Low-Voltage Distribution Networks with Photovoltaic Systems

2015 ◽  
Vol 781 ◽  
pp. 388-392
Author(s):  
Piyadanai Pachanapan ◽  
Suttichai Premrudeepreechacharn
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Control Method ◽  
Low Voltage ◽  
Dynamic Performance ◽  
Distribution Networks ◽  
Voltage Source ◽  
Pv System ◽  
Reactive Power Control ◽  
Dynamic Voltage

The coordinated reactive power control among photovoltaic (PV) systems, without communication requirement, is introduced to prevent the over-voltage problems in radial distribution networks. The voltage source inverter in PV system can provide the reactive power control to deal with the dynamic voltage variations. Two reactive power control methods, Q(P) and Q(V), can be employed into each PV system depending on its location. The dynamic voltage control performances are examined on simulation in DIgSILENT PowerFactory software. The results showed that the proposed control method can mitigate the rise of voltage level sufficiently.

Micro Static Var Compensator for Over-Voltage Control in Distribution Networks with High Penetration of Rooftop Photovoltaic Systems

2016 ◽  
Vol 839 ◽  
pp. 54-58 ◽  
Author(s):  
Piyadanai Pachanapan ◽  
Phudit Inthai
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Control Method ◽  
Voltage Control ◽  
Distribution Networks ◽  
Static Var Compensator ◽  
Pv System ◽  
Reactive Power Control ◽  
Pv Systems ◽  
Dynamic Voltage

A micro static var compensator (µSVC) is introduced in this work to prevent the over-voltage problems in radial distribution networks with high number of rooftop photovoltaic (PV) connections. The µSVC is aimed to use in the PV system that has the fixed-power factor inverter, which cannot provide the active voltage controllability. The µSVC is a small shunt compensator installed parallel with the PV system and providing the automatic reactive power support to deal with the dynamic voltage variations at the point of common coupling. Two reactive power control methods, Q(P) and Q(V), can be employed into each µSVC depending on the location of PV systems. Moreover, the coordinated reactive power control among µSVCs, without communication system requirement, is presented for enhancing the Volt-Var controllability to the group of PV systems located in the same feeder. The dynamic voltage control performances are examined on simulation in DIgSILENT PowerFactory software. The results showed that the proposed control method can mitigate the rise of voltage level sufficiently.

scholarly journals A Hybrid Reactive Power Control Method of Distributed Generation to Mitigate Voltage Rise in Low-Voltage Grid

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 2078 ◽  
Author(s):  
Soo-Bin Kim ◽  
Seung-Ho Song
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Control Method ◽  
Low Voltage ◽  
Voltage Regulation ◽  
Active Power ◽  
Reactive Power Control ◽  
Voltage Rise ◽  
Distributed Generator ◽  
Network Losses

A high penetration of distributed generators, such as solar and wind power generators in low voltage network systems, impose voltage rise problems. Reactive power control of distributed generators can contribute to mitigating the voltage rise. In the existing reactive power control, reactive power was controlled using only one local variable, such as voltage at point of connection or the active power output of distributed generator. In case of PF(P) method, which provides certain power factors, depending on the active power of distributed generator, the voltage regulation ability is strong, but network losses are large. Q(V) method, which provides a certain amount of reactive power depending on the local voltage, has few network losses, but the voltage regulation ability is weak. In this paper, a reactive power control method that combines the PF(P) method and Q(V) method was proposed. The proposed method determines the reactive power output by using the active power of the distributed generator and local voltage variables together. The proposed method improves the voltage regulation ability of the reactive power control, while reducing the network losses, as compared to the existing method. The low voltage network system was modeled and simulated to evaluate the performance of the proposed method, in terms of voltage regulation ability and network losses, and the performance of the proposed method and the existing method were compared and analyzed.

scholarly journals Voltage Control Method for Active Distribution Networks Based on Regional Power Coordination

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4364 ◽  
Author(s):  
Ou-Yang ◽  
Long ◽  
Du ◽  
Diao ◽  
Li
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Control Method ◽  
Voltage Control ◽  
Distribution Networks ◽  
Active Power ◽  
Reactive Power Control ◽  
Safety Issues ◽  
Bus Voltage ◽  
The Relationship

As loads connected to active distribution network (ADN) grow, ADN’s voltage safety issues are becoming more serious. At present, the solution is mainly to build more distributed generation (DG) or to adjust the reactive power in the whole network, but the former needs a lot of investment while the latter requires a large amount of communication equipment and it takes a long time to calculate the adjustment amount of reactive power and to coordinate reactive power compensation equipment. When the loads are heavy, there will still be drawbacks of insufficient reactive power. Therefore, this paper analyzes the relationship between the active power, reactive power, and the voltage in the ADN. Through the autonomous region (AR) division, a voltage control method based on the active power variation and adjustable power in the AR is proposed. According to the relationship between the amount of active power and the adjustable amount active power, the active power control, the reactive power control, and the coordinated control of active power reactive power control are adopted to adjust the DGs’ output to stabilize the bus voltage. The simulation results show that the proposed method can effectively improve the voltage control capability of ADN and can enable it to operate normally under greater power changes. Through the control method in this paper, the communication requirements are greatly reduced and the calculation time is effectively shortened and is more adaptable.

scholarly journals Reactive Power Control Method for Enhancing the Transient Stability Total Transfer Capability of Transmission Lines for a System with Large-Scale Renewable Energy Sources

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3154
Author(s):  
Yuwei Zhang ◽  
Wenying Liu ◽  
Fangyu Wang ◽  
Yaoxiang Zhang ◽  
Yalou Li
Keyword(s):  
Power Control ◽  
Transmission Lines ◽  
Reactive Power ◽  
Control Method ◽  
Renewable Energy Sources ◽  
Voltage Source ◽  
Reactive Power Control ◽  
Total Transfer Capability ◽  
Transfer Capability ◽  
Thevenin Equivalent

With the increased proportion of intermittent renewable energy sources (RES) integrated into the sending-end, the total transfer capability of transmission lines is not sufficient during the peak periods of renewable primary energy (e.g., the wind force), causing severe RES power curtailment. The total transfer capability of transmission lines is generally restricted by the transient stability total transfer capability (TSTTC). This paper presents a reactive power control method to enhance the TSTTC of transmission lines. The key is to obtain the sensitivity between TSTTC and reactive power, while the Thevenin equivalent voltage is the link connecting TSTTC and reactive power. The Thevenin theorem states that an active circuit between two load terminals can be considered as an individual voltage source. The voltage of this source would be open-circuit voltage across the terminals, and the internal impedance of the source is the equivalent impedance of the circuit across the terminals. The Thevenin voltage used in Thevenin’s theorem is an ideal voltage source equal to the open-circuit voltage at the terminals. Thus, the sensitivities between TSTTC and the Thevenin equivalent voltages of the sending-end and receiving-end were firstly derived using the equal area criterion. Secondly, the sensitivity between the Thevenin equivalent voltage and reactive power was derived using the total differentiation method. By connecting the above sensitivities together with the relevant parameters calculated from Thevenin equivalent parameter identification and power flow equation, the sensitivity between TSTTC and reactive power was obtained, which was used as the control priority in the proposed reactive power control method. At last, the method was applied to the Gansu Province Power Grid in China to demonstrate its effectiveness, and the accuracy of the sensitivity between TSTTC and reactive power was verified.

Design, Control, and Modeling of a New Voltage Source Converter for HVDC System

2013 ◽  
Vol 14 (2) ◽  
pp. 123-138
Author(s):  
Madhan Mohan ◽  
Bhim Singh ◽  
Bijaya Ketan Panigrahi
Keyword(s):  
Power Control ◽  
Fundamental Frequency ◽  
Reactive Power ◽  
Control Method ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Reactive Power Control ◽  
Hvdc System ◽  
Active And Reactive Power ◽  
The Dead

Abstract: A New Voltage Source Converter (VSC) based on neutral clamped three-level circuit is proposed for High Voltage DC (HVDC) system. The proposed VSC is designed in a multipulse configuration. The converter is operated by Fundamental Frequency Switching (FFS). A new control method is developed for achieving all the necessary control aspects of HVDC system such as independent real and reactive power control, bidirectional real and reactive power control. The basic of the control method is varying the pulse width and by keeping the dc link voltage constant. The steady state and dynamic performances of HVDC system interconnecting two different frequencies network are demonstrated for active and reactive power control. Total number of transformers used in this system are reduced to half in comparison with the two-level VSCs for both active and reactive power control. The performance of the HVDC system is improved in terms of reduced harmonics level even at fundamental frequency switching. The harmonic performance of the designed converter is also studied for different value of the dead angle (β), and the optimized range of the dead angle is achieved for varying reactive power requirement. Simulation results are presented for the designed three level multipulse voltage source converters with the proposed control algorithm.

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