Multi-mode adaptive local reactive power control method based on PV inverters in low voltage distribution networks

2020 ◽  
Vol 14 (4) ◽  
pp. 542-551 ◽  
Author(s):  
Yongxiang Cai ◽  
Wei Tang ◽  
Li Li ◽  
Bo Zhang ◽  
Lu Zhang ◽  
...  
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Control Method ◽  
Low Voltage ◽  
Distribution Networks ◽  
Voltage Distribution ◽  
Reactive Power Control ◽  
Multi Mode

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.

scholarly journals Advanced voltage control method for improving the voltage quality of low-voltage distribution networks with photovoltaic penetrations

2021 ◽  
Vol 4 (S2) ◽  
Author(s):  
Marika Nakamura ◽  
Shinya Yoshizawa ◽  
Hideo Ishii ◽  
Yasuhiro Hayashi
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Low Voltage ◽  
Distribution Network ◽  
Distribution Networks ◽  
Voltage Distribution ◽  
Power Conditioning ◽  
Pv Systems ◽  
Measurement Period ◽  
Voltage Violation

AbstractAs the number of photovoltaic (PV) power generators connected to the distribution grid increases, applications of on-load tap changers (OLTCs), power conditioning systems, and static reactive power compensators are being considered to mitigate the problem of voltage violation in low voltage distribution systems. The reactive power control by power conditioning systems and static reactive power compensators can mitigate steep voltage fluctuations. However, it creates losses in generation opportunities. On the other hand, OLTCs are installed at the bases of distribution lines and can collectively manage the entire system. However, the conventional voltage control method, i.e., the line drop compensation (LDC) method, is not designed for the case in which a large number of PV systems are installed in the distribution network, which results in voltage violations above the limit of the acceptable range. This study proposes a method to determine the optimal LDC control parameters of the voltage regulator, considering the power factor of PV systems to minimize the magnitude of voltage violations based on the voltage profile analysis of low-voltage (LV) distribution networks. Specifically, during a measurement period of several days, the voltages at some LV consumers and pole transformers were measured, and the optimal parameters were determined by analyzing the collected data. The effectiveness of the proposed method was verified through a numerical simulation study using the actual distribution system model under several scenarios of PV penetration rates. Additionally, the difference in the effectiveness of voltage violation reduction was verified in the case where all the LV consumer’s consumer voltage data measured per minute were used as well as in the case where only the maximum and minimum values of the data within the measurement period were used. The results reveal that the proposed method, which operates within the parameters determined by the voltage analysis of the LV distribution network, is superior to the conventional method. Furthermore, it was found that even if only the maximum and minimum values of the measurement data were used, an effective voltage violation reduction could be expected.

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.

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.

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