HVDC circuit breaker with sufficient interruption capability and interruption speed, as a key technology to enable HVDC transmission in meshed multi terminal networks do not yet exist. AC circuit breakers in combination with a passive resonance path are used to build HVDC breakers even though the requirements for AC breaking strongly differ from requirements for DC current interruption. Current...

In this paper, a nonlinear controller for VSC-HVDC transmission system is proposed. The feedback linearization based nonlinear differential-geometric techniques is used to cancel nonlinearities and decouple the input control variables. A predictive current control (PCC) method is also proposed. It can predict the current reference for the next sampling instant rapidly and accurately. Comprehens...

For the safe and fast recovery of line commutated converter based high-voltage direct current (LCC-HVDC) transmission systems after faults, a DC order optimization strategy is proposed. Considering constraint electric control quantities, with maximum active power transfer calculated by Thevenin equivalent parameters (TEPs) quasi-state equations LCC-HVDC systems. Meanwhile, to mitigate subsequen...

A new modeling method for high voltage direct current (HVDC) systems and associated controllers is presented for the power system simulator for engineering (PSS/E) simulation environment. The aim is to improve the estimation of the transient DC voltage and current in the event of an AC line-to-ground fault. The proposed method consists primary of three interconnected modules for (a) equation co...

In High Voltage Direct Current (HVDC) transmission system applications, the control and protection plays an essential role in overall performance. This paper aims to give solutions some performance problems that can occur HVDC link. this paper, ways mitigate serious malfunction of commutation failure process operation converters are studied functions like Commutation Failure Prevention (CFPREV)...

We consider frequency control in power systems made of several non-synchronous AC areas connected by a multi-terminal high-voltage direct current (HVDC) grid. We propose two HVDC control schemes to make the areas collectively react to power imbalances, so that individual areas can schedule smaller power reserves. The first scheme modifies the power injected by each area into the DC grid as a fu...

The design distance of offshore wind power plants connected through HVAC transmission systems might be extended due to the introduction mid-cable reactors for reactive compensation purposes and latest developments AC cables higher voltages. Therefore, applicability limits between HVDC must revised. This paper analyzes contribution that has on increasing systems. A methodology is developed deter...

Low-frequency high-voltage alternating-current (LF-HVac) transmission scheme has been recently proposed as an alternative solution to conventional 50/60-Hz HVac and direct-current (HVdc) schemes for bulk power transfer. This paper proposes optimal planning operation loss minimization in a multi-frequency system. In such system, LF-HVac grids are interconnected using back-to-back (BTB) converter...

For the purpose of HVDC or FACTS device studies, the AC power system is often reduced to an equivalent seen by the device at the point of common coupling (PCC). This practice is encouraged by the fact that electromagnetic transient simulation of large AC power systems is computationally expensive and time-consuming and might not respect the realtime constraints (for real-time commissioning stud...