Multi-Terminal DC Grid with Wind Power Injection

Lilantha Samaranayake,Janaka B Ekanayake,Carlos E Ugalde-Loo,John Licari,Oluwole D Adeuyi

doi:10.3390/wind2010002

Lilantha Samaranayake, Janaka B Ekanayake + Show 3 more

Open Access

https://doi.org/10.3390/wind2010002

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Abstract

With the development of offshore wind generation, the interest in cross-country connections is also increasing, which requires models to study their complex static and dynamic behaviors. This paper presents the mathematical modeling of an offshore wind farm integrated into a cross-country HVDC network forming a multi-terminal high-voltage DC (MTDC) network. The voltage source converter models were added with the control of active power, reactive power, frequency, and DC link voltages at appropriate nodes in the MTDC, resembling a typical cross-country multi-terminal type of HVDC scenario. The mathematical model for the network together with the controllers were simulated in MATLABTM and experimentally verified using a real-time digital simulator hardware setup. The resulting static and dynamic responses from the hardware setup agreed well with those from simulations of the developed models.

Highlights

The simulation results are compared against the experimental results for verification of the four cases, namely GSC1 only, GSC1 connected to GSC2, GSC1 connected to WFC, and GSC1 connected to GSC2 and WFC
The mathematical modeling of an offshore wind farm integrated with a cross-country
High-voltage direct current (HVDC) network, i.e., multi-terminal high-voltage DC (MTDC) network, has been presented along with simulation results relating to the dynamic behavior and backed up by experimental verifications

Summary

Introduction

While technological developments to replace fossil-fuel-based energy systems are challenging, it is becoming increasingly clear that decarbonizing electricity grids is a must. During this journey, the development of renewable energy sources (RESs) both onshore and offshore will play a key role. In 2020, more than 6 GW of offshore wind power capacity was added globally, bringing the cumulative global capacity to 34 GW. It is expected that approximately 83 GW of offshore wind will be connected to the North Sea regional grid in Europe by 2030 [4,5]

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