A coordinated voltage control approach for coordination of OLTC, voltage regulator and DG to regulate voltage in a distribution feeder

Muttaqi, Kashem M.; Le, A.D.T.; Negnevitsky, Michael; Ledwich, Gerard

doi:10.1109/ias.2013.6682518

Cited by 38 publications

(36 citation statements)

References 11 publications

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“…In [9], a method for coordinating the operation of DG and step voltage regulator for improvement of distribution system voltage regulation has been presented. In [17], a coordination scheme is developed for coordination of a single DG with OLTC with an advanced LDC which is developed based on uniformly distributed load.…”

Section: Imentioning

confidence: 99%

“…Also, operation of the tap changing and the DG systems inclusion have made the process of selecting R and X even more complicated [13]. In an earlier work of the authors [17], an advanced LDC is proposed that allows the estimation of the remote end voltage without any difficulties of choosing the LDC's internal coefficient settings. The voltage prediction by Advanced LDC is performed by utilizing only the local voltage and current measurements.…”

Section: Advanced Ldc Fo R Vo Ltage Predictio Nmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Tuning Method for Advanced Line Drop Compensator and its application to Response Coordination of Distributed Generation with Voltage Regulating Devices

Muttaqi

Negnevitsky

et al. 2015

IEEE Trans. on Ind. Applicat.

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Nowadays, integration of small-scale electricity generators, known as Distributed Generation (DG), into distribution networks has become increasingly popular. This tendency together with the falling price of DG units has a great potential in giving the DG a better chance to participate in voltage regulation process, in parallel with other regulating devices already available in the distribution systems. The voltage control issue turns out to be a very challenging problem for distribution engineers, since existing control coordination schemes need to be reconsidered to take into account the DG operation. In this paper, a control coordination approach is proposed, which is able to utilize the ability of the DG as a voltage regulator, and at the same time minimize the interaction of DG with another DG or other active devices, such as On-load Tap Changing Transformer (OLTC). The proposed technique has been developed based on the concepts of protection principles (magnitude grading and time grading) for response coordination of DG and other regulating devices and uses Advanced Line Drop Compensators (ALDCs) for implementation. A distribution feeder with tap changing transformer and DG units has been extracted from a practical system to test the proposed control technique. The results show that the proposed method provides an effective solution for coordination of DG with another DG or voltage regulating devices and the integration of protection principles has considerably reduced the control interaction to achieve the desired voltage correction. Abstract --Nowadays, integration of small-scale electricity generators, known as Distributed Generation (DG), into distribution networks has become increasingly popular. This tendency together with the falling price of DG units has a great potential in giving the DG a better chance to participate in voltage regulation process, in parallel with other regulating devices already available in the distribution systems. The voltage control issue turns out to be a very challenging problem for distribution engineers, since existing control coordination schemes need to be reconsidered to take into account the DG operation. In this paper, a new tuning method for line drop compensator has been proposed and it is applied for control coordination of DG with other regulating devices in the network, which is able to utilize the ability of the DG as a voltage regulator, and at the same time minimize the interaction of DG with another DG or other active devices, such as On-load Tap Changing Transformer (OLTC). The proposed coordination technique has been developed based on the concepts of protection principles (magnitude grading and time grading) for response coordination of OLTC, DG unit and other regulating devices. A distribution feeder with tap changing transformer and DG unit has been extracted from a practical system to test the proposed control technique. The results show that the proposed method provides an effective solution for coordination between OLTC and DG, DG-DG or DG ...

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Section: Imentioning

confidence: 99%

Section: Advanced Ldc Fo R Vo Ltage Predictio Nmentioning

confidence: 99%

A Novel Tuning Method for Advanced Line Drop Compensator and its application to Response Coordination of Distributed Generation with Voltage Regulating Devices

Muttaqi

Negnevitsky

et al. 2015

IEEE Trans. on Ind. Applicat.

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“…Excessive OLTC operation is inadequate because tap-changes can cause transients and mechanical failures [23]. Therefore, the minimum transformer-tap control action is performed to adjust the voltage of generators to the scheduled voltage.…”

Section: Objective Functionmentioning

confidence: 99%

“…In many countries, the OLTC is operating to control only the voltage of the bus connected to the transformer. However, as the use of electric power facilities becomes more important due to the recent rapid increase in electric power consumption worldwide, research on the efficient use of OLTC is being actively carried out [22][23][24][25]. Previous studies have focused on the voltage control function of the OLTC.…”

Section: Introductionmentioning

confidence: 99%

An Approach to Improve the Penetration of Sustainable Energy Using Optimal Transformer Tap Control

Bae

Lee

2017

Sustainability

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A method to secure the generator reactive power reserve by adjusting the transformer tap to improve the power system penetration of renewable energy has been proposed in this study. The tap is adjusted based on the voltage and reactive power sensitivity in the power system network. That is, the transformer tap sensitivity is calculated and analyzed to adjust the tap variation to gain sufficient or the least necessary amount of reactive power reserve. This method can be effective for generators without any margins in the reserves. The optimization problem based on the calculated sensitivities and effectiveness are presented. The optimum solution derived from such a problem provides the minimum control amount necessary to maintain the system voltage and dynamic reactive power reserve at their pre-specified levels to improve the power system acceptability of renewable energy. To demonstrate the effectiveness of the method proposed, a simulation has been performed for an IEEE-25 bus system. The results from simulations prove that the voltage has been well maintained while securing a dynamic reactive power reserve through optimal control based on the sensitivity analysis.

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“…T delay is largely dependent on the tap changer design. A minimum of 2 seconds is given in [20]. The trigger time t tri and tap position n tap will be sent to the MPC controller.…”

Section: Coordination With Oltcmentioning

confidence: 99%

Coordinated Voltage Control of a Wind Farm Based on Model Predictive Control

Zhao

Guo

et al. 2016

IEEE Trans. Sustain. Energy

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Abstract-This paper presents an autonomous wind farm voltage controller based on Model Predictive Control (MPC). The reactive power compensation and voltage regulation devices of the wind farm include Static Var Compensators (SVCs), Static Var Generators (SVGs), Wind Turbine Generators (WTGs) and On-Load Tap Changing (OLTC) Transformer, and they are coordinated to keep the voltages of all the buses within the feasible range. Moreover, the reactive power distribution is optimized throughout the wind farm in order to maximize the dynamic reactive power reserve. The sensitivity coefficients are calculated based on an analytical method to improve the computation efficiency and overcome the convergence problem. Two control modes are designed for both voltage violated and normal operation conditions. A wind farm with 20 wind turbines was used to conduct case studies to verify the proposed coordinated voltage control scheme under both normal and disturbance conditions. Index Terms-Dynamic

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A coordinated voltage control approach for coordination of OLTC, voltage regulator and DG to regulate voltage in a distribution feeder

Cited by 38 publications

References 11 publications

A Novel Tuning Method for Advanced Line Drop Compensator and its application to Response Coordination of Distributed Generation with Voltage Regulating Devices

A Novel Tuning Method for Advanced Line Drop Compensator and its application to Response Coordination of Distributed Generation with Voltage Regulating Devices

An Approach to Improve the Penetration of Sustainable Energy Using Optimal Transformer Tap Control

Coordinated Voltage Control of a Wind Farm Based on Model Predictive Control

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