Improved Low Voltage - Ride Through (LVRT) ‎Performance of an Active Distribution Grid by ‎Providing a Bidirectional Converter to Control DC ‎Bus Voltage Ripple

Subject Areas : Electrical Engineering

afshin kadri ¹ , Reza Ebrahimi ^{2 *} , Edris Pouresmaeil ³

1 - Department of Electrical Engineering, Gorgan Branch, Islamic Azad University, Gorgan, Iran
2 - Department of Electrical Engineering, Gorgan Branch, Islamic Azad University, Gorgan, Iran
3 - Department of Electrical Engineering and Automation, Aalto University, 02150 Espoo, Finland

Received: 2023-04-18 Accepted : 2023-06-09 Published : 2023-06-01

Keywords: Inverter, renewable energy sources, Low Voltage - Ride Through, Bidirectional converter,

Abstract :

In today's world, distributed generation sources through grid-connected inverters perform other roles in addition to generating the required load’s power. Among these roles, it is possible to perform the function of the inverter as a virtual synchronous machine in the direction of frequency stability in the presence of a fault, supporting the network in the condition of voltage fault caused by the presence of a fault, and so on. It can be mentioned that doing each of these things, It requires changes in the control system, hardware or new topologies. Supporting the grid in voltage sag conditions, that is called Low Voltage - Ride Through for an inverter, has its own standards and requirements, so meeting them requires new research and designs. In this paper, first, a review of the past work is done and then by presenting a new method, the inverter performance is improved in these conditions. In the presented method, the DC bus ripple will be very low and thus the high order harmonics will be reduced. Also, this ripple is reduced by using a two-way converter and suitable control of the inverter, unlike some of the presented methods that transfer it on the reactive power produced or on the voltage of the solar cell side. Furthermore, in these cases, it is tried to reduce the DC bus ripple to the minimum value of the capacitive capacity of this bus. To evaluate the presented method, simulations have been performed in Simulink / MATLAB software and the results have been presented.

References:

[1] E.  Afshari,  G. R. Moradi,  R. Rahimi, B.  Farhangi,  Y. Yang,  F.  Blaabjerg ,  S.  Farhangi, “Control strategy for three-phase grid-connected PV inverters enabling current limitation under unbalanced faults”. IEEE Transactions on Industrial Electronics, 64(11), 8908-8918,2017.

[2] Y.  Geng, ,  K.. Yang,  Z. Lai,  P.  Zheng,  H.  Liu,  & R.  Deng, “A novel  low voltage ride  through control method for current source grid-connected photovoltaic inverters”. IEEE Access, 7, 51735-51748, 2019.

[3] D.I. Brandao, F.E.  Mendes, R.V.  Ferreira, S.M.  Silva, &  I.A. Pires. “Active and reactive power injection strategies for three- phase four-wire inverters during symmetrical/asymmetrical voltage sags”. IEEE Transactions on Industry Applications, 55(3), 2347-2355, 2019.

[4] G. Ding, F.  Gao, H. Tian, C.  Ma, M.  Chen, G.  He, &  Y. Liu.” Adaptive DC-link voltage control of two-stage photovoltaic inverter during low voltage ride-through operation”. IEEE Transactions on Power   Electronics, 31(6), 4182-4194, 2015.

 [5] P. Rodriguez, A.  Timbus, R.  Teodorescu, M.  Liserre, F. Blaabjerg. “Reactive power control for improving wind turbine system behavior under grid faults”. IEEE Transactions on Power Electronics, 24(7), 1798-1801, 2009.

[6] P. Rodriguez, A.V. Timbus, R. Teodorescu, M. Liserre,  & F.  Blaabjerg. “Flexible active power control of distributed power generation systems during grid faults”. IEEE transactions on industrial electronics, 54(5), 2583-2592, 2007.

[7] A.  Khoshooei, J.S. Moghani, I. Candela, & P. Rodriguez.“Control of D-STATCOM during unbalanced grid faults based on DC voltage oscillations and peak current limitations. IEEE Transactions on Industry Applications”, 54(2), 1680-1690, 2017.

[8] A. Luna, P. Rodriguez, R. Teodorescu, & F. Blaabjerg.” Low voltage ride through strategies for SCIG wind turbines in distributed power generation systems”. In 2008 IEEE Power Electronics Specialists Conference (pp. 2333-2339) IEEE, 2008.

[9] A.  Luna, J. Rocabert,  J.I.  Candela, J.R.  Hermoso, R. Teodorescu, F.  Blaabjerg,  & P. Rodriguez.” Grid voltage synchronization for distributed generation systems under grid fault conditions”. IEEE Transactions on Industry Applications, 51(4), 3414-3425, 2015.

[10] P.  Rodriguez, A.V.   Timbus, R. Teodorescu, M.  Liserre, &  F. Blaabjerg. “Independent PQ control for distributed power generation systems under grid faults”. In IECON 2006-32nd Annual Conference on IEEE Industrial Electronics (pp. 5185-5190). IEEE, 2006.

[11]  S. Alepuz, S.  Busquets-Monge, J. Bordonau , J.A. Martínez-Velasco, C.A. Silva, J.  Pontt, & J.  Rodríguez. “Control strategies based on symmetrical components for grid-connected converters under voltage dips”. IEEE Transactions on Industrial Electronics, 56(6), 2162-2173,2009.

[12] Guangqian Ding,  Feng Gao,  Hao Tian,  Cong Ma; Mengxing Chen,  Guoqing He,  Yingliang Liu. (2016)”Adaptive DC-Link Voltage Control of Two-Stage Photovoltaic Inverter During Low Voltage Ride-Through Operation” pp. 4182 – 4194, 20016.

[13] Mohammed  Ali Khan; Ahteshamul  Haque; V. S. Bharath  Kurukuru.”Dynamic Voltage Support for Low-Voltage Ride-Through Operation in Single-Phase Grid-Connected Photovoltaic Systems”. pp. 12102 – 1211,2021.