New Breed of Network Fault-Tolerant Voltage-Source-Converter HVDC Transmission System

Abstract

This paper proposes a new breed of high-voltage dc (HVDC) transmission systems based on a hybrid multilevel voltage source converter (VSC) with ac-side cascaded H-bridge cells. The proposed HVDC system offers the operational flexibility of VSCbased systems in terms of active and reactive power control, blackstart capability, in addition to improved ac fault ride-through capability and the unique feature of current-limiting capability during dc side faults. Additionally, it offers features such as smaller footprint and a larger active and reactive power capability curve than existing VSC-based HVDC systems, including those using modular multilevel converters. To illustrate the feasibility of the proposed HVDC system, this paper assesses its dynamic performance during steady-state and network alterations, including its response to ac and dc side faults.Index Terms-DC fault reverse blocking capability, hybrid multilevel converter with ac side cascaded H-bride cells, modular multilevel converter, voltage-source-converter high-voltage dc (VSC-HVDC) transmission system.

Phase-Shifted Carrier Pulse Width Modulation Based on Particle Swarm Optimization for Cascaded H-bridge Multilevel Inverters with Unequal DC Voltages

“…The calculation of carrier phases needs to solve the nonlinear transcendental equations shown in Equation (13). The calculation is usually complex and time-consuming.…”

“…Therefore, the capability of riding through the cell dc source faults is required [13][14][15][16][17][18]. The cell dc source faults that lead to a drop in the dc voltage result in unequal cell dc voltages, and some differences in cell dc source parameters result in unequal cell dc voltages too.…”

Reverse-blocking modular multilevel converter for battery energy storage systems

“…For megawatt-scale medium-voltage (MV) application, multilevel converters show significant advantages over conventional topologies [12]. Among them, the most promising concept for renewable energy integration and power transmission is the modular multilevel converter (MMC) [13][14][15]. Compared with conventional multilevel converters, MMCs provide advantages of high modularity, better harmonic spectra, lower switching frequency, higher efficiency, and reduced weight of the filtering components.…”

Neutral-point-clamped hybrid multilevel converter with DC fault blocking capability for medium-voltage DC transmission

“…To overcome the drawbacks of the MMC, a new type of VSC called a hybrid multilevel converter has been proposed in recent years [14,15]. The hybrid multilevel converter combines features and advantages of the aforementioned two groups of VSCs and employs IGBTs and SMs in series.…”

“…The hybrid multilevel converter combines features and advantages of the aforementioned two groups of VSCs and employs IGBTs and SMs in series. The alternate arm converter (AAC) proposed in [14] and the hybrid cascaded multilevel converter (HCMC) proposed in [15] are two typical hybrid multilevel converters that can be regarded as hybrids of the TLC and MMC. By employing IGBTs in series as director switches (DSs) in place of some SMs, the AAC and HCMC employ fewer SMs, and therefore can reduce the number and cost of power electronic devices.…”