Accurate and efficient modelling of grid tied inverters for investigating their interaction with the power grid

Hadjidemetriou, Lenos; Kyriakides, Elias

doi:10.1109/ptc.2017.7980897

Cited by 7 publications

(14 citation statements)

References 20 publications

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“…Advanced operational capabilities of power electronic based distributed energy resources (DERs) can be employed to compensate power quality phenomena such as harmonics, interharmonics, and current/voltage unbalances [15,[19][20][21][22]. Hence, smart and multi-functional inverters are capable of providing multiple ancillary services to the MG, along with dedicated resources such as automatic power factor correction equipment.…”

Section: Introductionmentioning

confidence: 99%

Improving the Efficiency and Sustainability of Power Systems Using Distributed Power Factor Correction Methods

2020

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For the equipment connected to the three-phase or single-phase grid, the power factor represents an efficiency measure for the usage of electrical energy. The power factor improvement through correction methods reduces the load on the transformers and power conductors, leading to a reduction of losses in the mains power supply and a sustainable grid system. The implications at the financial level are also important. An example of load that generates a small power factor is represented by a motor without mechanical load or having a small mechanical load. Given the power factor correction (PFC), the costs are reduced through the elimination of penalties, applying only in the common coupling point (CCP). The advantages of using equipment for the power factor correction are related also to their long operation duration and the easiness of their installation. The device presented in this article takes advantage of the advances in information and communication technology (ICT) to create a new approach for telemetry and remote configuration of a PFC. This approach has flexibility and versatility, such that it can be adapted to many loads, easily changing the capacitance steps and settings of the power factor correction device.

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Section: Introductionmentioning

confidence: 99%

Improving the Efficiency and Sustainability of Power Systems Using Distributed Power Factor Correction Methods

2020

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“…It should be noted that there are already commercial inverters providing such functionalities [13]. Advanced operational capabilities of power electronic based DERs can also be employed to compensate power quality phenomena such as harmonics, interharmonics and current/voltage unbalances [14][15][16][17][18]. Hence, smart and multi-functional inverters are capable of providing multiple ancillary services to the DSO.…”

Section: Introductionmentioning

confidence: 99%

Phase Balancing and Reactive Power Support Services for Microgrids

et al. 2019

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Alternating current (AC) microgrids are expected to operate as active components within smart distribution grids in the near future. The high penetration of intermittent renewable energy sources and the rapid electrification of the thermal and transportation sectors pose serious challenges that must be addressed by modern distribution system operators. Hence, new solutions should be developed to overcome these issues. Microgrids can be considered as a great candidate for the provision of ancillary services since they are more flexible to coordinate their distributed generation sources and their loads. This paper proposes a method for compensating microgrid power factor and loads asymmetries by utilizing advanced functionalities enabled by grid tied inverters of photovoltaics and energy storage systems. Further, a central controller has been developed for adaptively regulating the provision of both reactive power and phase balancing services according to the measured loading conditions at the microgrid’s point of common coupling. An experimental validation with a laboratory scale inverter and a real time hardware in the loop investigation demonstrates that the provision of such ancillary services by the microgrid can significantly improve the operation of distribution grids in terms of power quality, energy losses and utilization of available capacity.

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“…Hence, the main contribution of this paper is the design of a tailor-made voltage support scheme for distribution grids where the resistive characteristics of distribution lines are properly considered and the support intensity depends on the level of voltage drop. It should be highlighted that a constant DC source is assumed in most of the studies [8], [9], [12]- [15], which simplify the controller and ignore the dynamics of the primary energy resource. In this work, a detailed model for a photovoltaic system is developed for primary energy resource to allow a more realistic study.…”

Section: Introductionmentioning

confidence: 99%

Voltage Support Scheme for Low Voltage Distribution Grids Under Voltage Sags

Charalambous¹,

Hadjidemetriou²,

Kyriakides³

2019

2019 IEEE Milan PowerTech

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A grid-connected power electronics based distributed generator can act as an active element by providing support to the grid under various disturbances. In this paper, a voltage support scheme dedicated for distributed generators installed in the low voltage distribution network is proposed. The voltage support considers the resistive characteristics of the distribution line grid impedance in order to maximize its effectiveness. Therefore, the optimal active and reactive current references are estimated based on the resistance to reactance ratio (R/X). Moreover, a droop curve is suggested such that the intensity of voltage support will be defined according to the voltage drop conditions. The proposed voltage support concept is applied on a photovoltaic system to validate its operation. The effectiveness of the proposal is confirmed by means of simulations in a realistic low voltage distribution network. Index Terms-fault ride through operation, low voltage distribution grid, photovoltaics, voltage support scheme.

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Accurate and efficient modelling of grid tied inverters for investigating their interaction with the power grid

Cited by 7 publications

References 20 publications

Improving the Efficiency and Sustainability of Power Systems Using Distributed Power Factor Correction Methods

Improving the Efficiency and Sustainability of Power Systems Using Distributed Power Factor Correction Methods

Phase Balancing and Reactive Power Support Services for Microgrids

Voltage Support Scheme for Low Voltage Distribution Grids Under Voltage Sags

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