Heuristic Coordinated Voltage Control Schemes in Distribution Network with Distributed Generations

The voltage and reactive power control (Volt/VAR Control, VVC) in distribution networks has become a challenging issue with the increasing utilization of distributed generations (DGs). In this paper, a heuristic-based coordinated voltage control scheme that considers distribution voltage control devices, i.e., on-load tap changers (OLTC) and step voltage regulators (SVR), as well as reactive power control devices, i.e., DGs, are proposed. Conventional voltage control methods using non-linear node voltage equations require complex computation. In this paper, the formulation of simplified node voltage equations accounting for changes in tap position of distribution voltage control devices and reactive power changes of reactive power control devices are presented. A heuristic coordinated voltage control scheme using the proposed simplified node voltage equations is proposed. A coordinated voltage control scheme to achieve voltage control for nominal voltage and conservative voltage reduction (CVR) is presented. The results of the proposed schemes are compared with the results from the quadratic optimization method to confirm that the proposed schemes yields suitably similar results. Furthermore, a tap scheduling method is proposed to reduce the number of tap changes while controlling network voltage. The tap position is readjusted using a voltage control performance index (PI). Simulation results confirm that when using this method the number of tap changes is reduced. The proposed scheme not only produces reasonable performance in terms of control voltage of networks but also reduces the number of tap changes made by OLTC. The proposed control method is an alternative candidate for a system to be applied to practical distribution networks due to its simplified calculations and robust performance.

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An accurate reactive power control study in virtual flux droop control

Open Physics ◽

10.1515/phys-2017-0116 ◽

2017 ◽

Vol 15 (1) ◽

pp. 948-953

Author(s):

Aimeng Wang ◽

Jia Zhang

Keyword(s):

Power Control ◽

Reactive Power ◽

Control Method ◽

Power Sharing ◽

Control Voltage ◽

Droop Control ◽

Reactive Power Control ◽

Control Scheme ◽

Static Performance ◽

Virtual Flux

AbstractThis paper investigates the problem of reactive power sharing based on virtual flux droop method. Firstly, flux droop control method is derived, where complicated multiple feedback loops and parameter regulation are avoided. Then, the reasons for inaccurate reactive power sharing are theoretically analyzed. Further, a novel reactive power control scheme is proposed which consists of three parts: compensation control, voltage recovery control and flux droop control. Finally, the proposed reactive power control strategy is verified in a simplified microgrid model with two parallel DGs. The simulation results show that the proposed control scheme can achieve accurate reactive power sharing and zero deviation of voltage. Meanwhile, it has some advantages of simple control and excellent dynamic and static performance.

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Nonlinear reactive power control scheme to maximize penetration of distributed generation in distribution networks

2017 IEEE Electrical Power and Energy Conference (EPEC) ◽

10.1109/epec.2017.8286185 ◽

2017 ◽

Cited By ~ 1

Author(s):

Amrit Singh ◽

Peter W. Lehn

Keyword(s):

Power Control ◽

Distributed Generation ◽

Reactive Power ◽

Distribution Networks ◽

Reactive Power Control ◽

Control Scheme

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

Energies ◽

10.3390/en12224364 ◽

2019 ◽

Vol 12 (22) ◽

pp. 4364 ◽

Cited By ~ 3

Author(s):

Ou-Yang ◽

Long ◽

Du ◽

Diao ◽

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.

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.839.54 ◽

2016 ◽

Vol 839 ◽

pp. 54-58 ◽

Cited By ~ 1

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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