Multi Terminal High Voltage DC control system

Traditional power equipment, power-grid structures, and operation technology are becoming increasingly powerless with the large-scale renewable energy access to the grid. Thus, we must adopt new technologies, new equipment, and new grid structure to satisfy future requirements in energy patterns. Ac

Project Title

Multi Terminal High Voltage DC control system

Project Area of Specialization

Electrical/Electronic Engineering

Project Summary

Traditional power equipment, power-grid structures, and operation technology are becoming increasingly powerless with the large-scale renewable energy access to the grid. Thus, we must adopt new technologies, new equipment, and new grid structure to satisfy future requirements in energy patterns. Accordingly, the multiterminal direct current (MTDC) transmission system is receiving increasing attention. This paper starts with a brief description of current developments in MTDC worldwide. The MTDC project, which has been placed into practical operation, is introduced by the Italian–Corsica–Sardinian three-terminal high-voltage DC (HVDC) project. We then describe the basic characteristics and regulations of multiterminal DC transmission. The current mainstream of several control methods are described. In the third chapter, the key to the development of MTDC system or hardware and software technology that restricts the development of multiterminal DC transmission is discussed. This chapter focuses on the comparison of double-ended HVDC and multiterminal HVDC in most aspects and subsequently elaborates the key and difficult point of MTDC development.

Project Objectives

Increase “comfort level” for dc grids . That is, show that multi-terminal HVdc systems are both advantageous and feasible . Issues to explore include – Evolution / Topology of dc grid – Operation / Controllability of a dc grid – Need for breaker on dc side – Handling of islanded operation – Protection schemes for dc grid – Effects of cable capacitance – Communication infrastructure.

Project Implementation Method

PCBs, Voltage source converters, Grid forming converters, Transmission lines,  Controller etc.

Benefits of the Project

Losses are less .It is cost efficient, In AC there are three wires while in DC there are only two wires. Power Reversel is possible in DC .

Technical Details of Final Deliverable

Multi-Terminal VSC based HVDC (MTDC) is promising anticipation to transmit and integrate large offshore wind energy to on shore grids. This paper interprets the use of MTDC technology, seven terminal systems consisting of unanimously different local control for each VSC for integrating large offshore wind farms located hundreds of kilometer far from shore. Operating principal of proposed system has been described along with control of every VSC to accredit the solemn working and power sharing between various AC connected networks. EMTDC/PSCAD is used to simulate the seven terminal MTDC system, it consists of two different offshore wind farms connected to five different AC onshore grids through VSC's to exhibit the robust performance against power variation under load and faulty conditions. Local control schemes to the hilt have been implemented to study the behavior of VSC for aggregating offshore wind farms to onshore network.

Final Deliverable of the Project

HW/SW integrated system

Core Industry

Energy

Other Industries

Others

Core Technology

Others

Other Technologies

Clean Tech

Sustainable Development Goals

Affordable and Clean Energy

Required Resources

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