Investigation of performance of UPFC without DC link capacitor

Geethalakshmi, B.; Dananjayan, P.

doi:10.1016/j.epsr.2007.05.019

Cited by 39 publications

(18 citation statements)

References 13 publications

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“…If a large amount of DGs using renewable energy are installed to a distribution system, voltage deviations and fluctuations based on output power fluctuation of DGs become a significant problem which cannot be solved by only tap changing for a load ratio control transformer (LRT) in substation and step voltage regulators (SVRs), due to relatively slow behavior. As a countermeasure against this problem, some control methods that use mainly reactive power controllers such as flexible ac transmission systems (FACTS) [1]- [3] or reactive power control of distributed generators [4]- [12], have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Decentralized voltage control in distribution systems by distributed generators

Tanaka

2009

2009 IEEE International Symposium on Industrial Electronics

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Recently, renewable energy such as wind turbine generator and photovoltaic system are introduced as distributed generators (DGs). Connection of a large amount of distributed generator causes voltage deviation beyond the statutory range in distribution system. Reactive power control of inverter interfaced with DG is one of the solutions against this problem. Additionally, reactive power control has a possibility to contribute for reduction of distribution loss.In this paper, we propose a voltage control method in distribution system by reactive power control of inverters interfaced with DGs. The proposed method has been developed with the aim of reduction of distribution loss and voltage regulation into statutory range without any telecommunications. In the proposed method, each interfaced inverter controls reactive power based on voltage control reference, which is calculated from local measurements. The calculation rule of control reference has been developed using optimal data, which consist of relations between ramdomly given inputs and corresponding optimal outputs calculated by an optimization technique. Simulations are conducted to show the effectiveness of the proposed method.

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Section: Introductionmentioning

confidence: 99%

Decentralized voltage control in distribution systems by distributed generators

Tanaka

2009

2009 IEEE International Symposium on Industrial Electronics

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“…The mentioned advantages are achieved while the multiple dc sources are used to generate the output voltage waveform [4]. In recent years, MULTILEVEL inverters are one of the most versatile and powerful components that are utilized in many industrials such as FACTS devices [5] & [6], HVDC [7] & [8], etc. Various topologies for multilevel inverters have been introduced over the past 20 years, the most popular topologies are the diode-clamped [9], flying capacitor [10] and cascaded H-bridge topologies [11].…”

Section: Introductionmentioning

confidence: 99%

A New Topology of Multilevel Voltage Source Inverter to Minimize the Number of Circuit Devices and Maximize the Number of Output Voltage Levels

Ajami¹,

Mokhberdoran²,

Oskuee³

2013

Journal of Electrical Engineering and Technology

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-Nowadays multilevel inverters are developing generally due to reduced voltage stress on power switches and low total harmonic distortion (THD) in output voltage. However, for increasing the output voltage levels the number of circuit devices are increased and it results in increasing the cost of converter. In this paper, a novel multilevel inverter is proposed. The suggested topology uses less number of power switches and related gate drive circuits to generate the same level in output voltage with comparison to traditional cascaded multilevel inverter. With the proposed topology all levels in output voltage can be realized. As an illustration, a symmetric 13-level and asymmetric 29-level proposed inverters have been simulated and implemented. The total peak inverse (PIV) and power losses of presented inverter are calculated and compared with conventional cascaded multilevel inverter. The presented analyses show that the power losses in the suggested multilevel inverter are less than the traditional inverters. Presented simulation and experimental results demonstrate the feasibility and applicability of the proposed inverter to obtain the maximum number of levels with less number of switches.

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“…In addition, voltage regulation by OLTC has not reached a fundamental solution for power quality considering the power factor. As a countermeasure to this problem, the use of reactive power controllers, such as additional static VAR compensators (SVCs) [6][7][8][9][10][11] or the reactive power control system by the inclusion of an inverter with distributed generators [12][13][14][15][16][17][18] has been proposed. The literature [19] has discussed rapid and precise tap control online.…”

Section: Introductionmentioning

confidence: 99%

Optimal Operation Method for Distribution Systems Considering Distributed Generators Imparted with Reactive Power Incentive

et al. 2018

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Featured Application: The incentive method with flexible contribution functions can be applied to demand response by the reactive power market and distribution company, which has the possibility to reduce the additional installation of distribution control equipment and battery capacity. It also leads to the reduction of total electricity purchase cost of consumers, and the power system can achieve high mixing of renewable energy in the grid with the reactive power incentive demand response and the IoT development. Furthermore, reliability assessment of cooperative control with the participation rate will give an important contribution to the robust design of the system. Abstract: In order to solve urgent energy and environmental problems, it is essential to carry out high installation of distributed generation using renewable energy sources (RESs) and environmentally-friendly storage technologies. However, a high penetration of RESs usually leads to a conventional power system unreliability, instability and low power quality. Therefore, this paper proposes a reactive power control method based on the demand response (DR) program to achieve a safe, reliable and stable power system. This program does not enforce a change in the active power usage of the customer, but provides a reactive power incentive to customers who participate in the cooperative control of the distribution company (DisCo). Customers can achieve a reduction in their total energy purchase by gaining a reactive power incentive, whilst the DisCo can achieve a reduction of its total procurement of equipment and distribution losses. An optimal control schedule is calculated using the particle swarm optimization (PSO) method, and also in order to avoid over-control, a modified scheduling method that is a dual scheduling method has been adopted in this paper. The effectiveness of the proposed method was verified by numerical simulation. Then, simulation results have been analyzed by case studies.

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Investigation of performance of UPFC without DC link capacitor

Cited by 39 publications

References 13 publications

Decentralized voltage control in distribution systems by distributed generators

Decentralized voltage control in distribution systems by distributed generators

A New Topology of Multilevel Voltage Source Inverter to Minimize the Number of Circuit Devices and Maximize the Number of Output Voltage Levels

Optimal Operation Method for Distribution Systems Considering Distributed Generators Imparted with Reactive Power Incentive

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