Parallel Operation of Transformers With on Load Tap Changer and Photovoltaic Systems With Reactive Power Control

Kraiczy, Markus; Stetz, Thomas A.; Braun, Martin

doi:10.1109/tsg.2017.2712633

Cited by 75 publications

(54 citation statements)

References 11 publications

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“…where G ij and B ij are the real and imaginary part of the ij-th element of the network admittance matrix. Considering slack bus during time instant t, the voltage angle is equal to zero, while the voltage magnitude (V t sb ) is calculated according to (9) to model the OLTC operation.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

“…Furthermore, an offline coordination of the Q(V ) droop characteristics is proposed in [8] to minimize the overall reactive power of the DG units. Nevertheless, the above-mentioned methods attempt to solve a single-objective optimization problem, focusing on the coordinated operation of the DG units and neglecting possible interactions with other network devices, such as the OLTC [9].…”

mentioning

confidence: 99%

“…Consequently, the problem is simplified to a bi-objective optimal voltage regulation problem. Nevertheless, conflicts between the remaining objectives may occur in case of highly variable generated power due to the intermittent nature of DG units consisting mainly of renewable energy sources [9]. An attempt to address these conflicts is proposed in [13] and [14] by developing a coordinated voltage regulation method, without, however, ensuring the optimal network operation.…”

mentioning

confidence: 99%

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A Two-Stage Solution to the Bi-Objective Optimal Voltage Regulation Problem

Kryonidis

Demoulias

Papagiannis

2020

IEEE Trans. Sustain. Energy

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In this work, a two-stage approach is introduced to efficiently solve the optimal voltage regulation problem in radial medium-voltage (MV) distribution networks. The proposed method uses the available reactive power of distributed generation units and the on-load tap changer (OLTC) of the high-/medium-voltage transformer to regulate network voltages, while also minimizing two conflicting objectives, namely the network energy losses and the frequency of tap changes. This bi-objective optimal voltage regulation problem is addressed in two distinct stages. In the first stage, the network is linearized and a simplified optimal voltage regulation problem is solved to determine the candidate OLTC operating plans (COOPs). For each COOP, a new reactive power allocation method is employed in the second stage to regulate the network voltages and minimize network losses. This method follows a rule-based approach, allowing also its implementation under real-field conditions. The final outcome of this two-stage process is the Pareto-front which can be used by the distribution system operators to select the most preferable solution for the real-time network operation. The proposed methodology is characterized by reduced computational complexity compared to the application of conventional optimization techniques. Time-domain and time-series simulations on a radial MV distribution network are employed to thoroughly evaluate the performance of the proposed method.

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Section: Theoretical Frameworkmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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A Two-Stage Solution to the Bi-Objective Optimal Voltage Regulation Problem

Kryonidis

Demoulias

Papagiannis

2020

IEEE Trans. Sustain. Energy

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show abstract

“…In [5], voltage fluctuations in the grid due to solar systems were discussed and this problem was solved by reactive power control. In [6], the unnecessary switching of the On-Line Tap Changer (OLTC) was prevented by ensuring that the OLTC, which was present in the grid and PV system were working compatibly with each other. Using the sliding mode control, the inverter in the PV system was provided to generate useful reactive power in the study [7].…”

Section: Introductionmentioning

confidence: 99%

Active-Reactive Power Control of Grid-Tied Solar Energy Systems, Using Multi-Parameter Band Control for Grid Voltage Regulation

Tekin¹,

Şekkeli²

2020

ACTA POLYTECH HUNG

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One of the most studied and funded renewable energy sources is solar energy, all over the world. Solar panels are used to obtain electrical energy from the sun. They should be used effectively due to their expensive structure and challenging installation. However, as the sun light only reaches to the earth during daylight hours, solar systems cannot generate active power during the night, or in cases where daylight is not enough, the whole power capacity of the solar inverters have not been used. In this study; it was shown that in addition to the active power generation during the daytime hours, the solar systems were able to generate reactive power with the remaining capacity of the inverter. Thereby adjusting the grid voltage was provided by the solar system's reactive power control. Designed solar system generates completely reactive power at nights. Thus, the efficiency of the solar systems has been increased by ensuring that the solar systems have used to keep the grid voltage within the values, which stated in the standards, by producing reactive power as well as active power. Matlab/Simulink was used to model the system when using hysteresis band method for system control.

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“…The DG capabilities of voltage regulation are analyzed in [8,9]. The coordinated control of OLTC transformer and DGs is also widely studied to control the voltage problem [10,11]. Further, the effect of utilizing demand response is considered to mitigate system intermittency caused by renewable energy resources in [12].…”

Section: Introductionmentioning

confidence: 99%

A fast algorithm for manipulation control process of distribution system planning solution

Cheng

Wan

Tian

et al. 2019

J. Mod. Power Syst. Clean Energy

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Better flexibility and controllability have been introduced into distribution system with the development of new loads and resources. As a consequence, the connotations and tools for evaluating the planning solution need to be further enriched. This paper proposes a fast algorithm to quantify steady-state voltages and load profiles in distribution system by simulating the manipulation control process of controllable resources, taking the efficiency and ease of use into account. In this method, a complex distribution system is decoupled into several simple parts according to the ports of the DC interlink. Then, to achieve the qualified voltages and load profiles, the manipulation details of controllable resources are simulated following a certain control sequence in each part. Finally, the analysis results of each part are matched and filtered to obtain a complete evaluation. Five of the most commonly controllable resources are considered in this method. The effectiveness of the proposed method is demonstrated through a case study based on field data from an actual distribution system.

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Parallel Operation of Transformers With on Load Tap Changer and Photovoltaic Systems With Reactive Power Control

Cited by 75 publications

References 11 publications

A Two-Stage Solution to the Bi-Objective Optimal Voltage Regulation Problem

A Two-Stage Solution to the Bi-Objective Optimal Voltage Regulation Problem

Active-Reactive Power Control of Grid-Tied Solar Energy Systems, Using Multi-Parameter Band Control for Grid Voltage Regulation

A fast algorithm for manipulation control process of distribution system planning solution

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