Investigation of Capacitor Voltage Regulation in Modular Multilevel Converters with Staircase Modulation
نویسندگان
چکیده
This paper presents a detailed theoretical analysis and performance assessment of the capacitor voltage balancing strategies for staircase modulated modular multilevel converters (MMC) in terms of the algorithm structures, voltage balancing effect, and switching frequency. A constant-frequency redundancy selection (CFRS) method with minimal switching loss is proposed and the function realization of specific modules of the algorithm is given. This method is simple and efficient in both switching frequency and regulation capacity. Laboratory results show very good agreement with the theoretical analysis and numerical simulations.
منابع مشابه
Conduction and Dead-Time Voltage Drops Estimation of Asymmetric Cascaded H-Bridge Converters Utilizing Level-Shifted PWM Scheme
Linear AC power supplies can be replaced by their nonlinear switching counterparts due to the lower voltage drops and higher efficiency and power density of switching-mode inverters. Multilevel cascaded H-bridge (CHB) converters are the preferred inverter structure because of modular configuration, control, and protection. The output voltage quality in CHB converters depends on the number of ou...
متن کاملStudy on Control Strategies for the Multilevel Cascaded Converters
The multilevel cascaded converters are extensively applied for high-voltage and high-power applications, which are considered as the most favorable topologies for the high power ac-drives and the high-voltage DC transmission (HVDC) systems using the voltage source converters (VSCs). This paper presents the dc capacitor balancing and effective current regulation methodologies for the multilevel ...
متن کاملVoltage Regulation Using Phase Shift Modulation in Single-dc-source or Solar Voltage Source Using Cascaded H-bridge Multilevel Converters
Cascaded H-bridge multilevel power electronic converters generally require several dc sources. An alternative option is to replace all the separate dc sources feeding the H-bridge cells with capacitors, leaving only one H-bridge cell with a real dc voltage source. This will yield a cost-effective converter. However, the required capacitor voltage balancing is challenging. In this paper, using t...
متن کاملMultilevel Converters-A New Breed of Power Converters
AbstructMultilevel voltage source converters are emerging as a new breed of power converter options for high-power applications. The multilevel voltage source converters typically synthesize the staircase voltage wave from several levels of dc capacitor voltages. One of the major limitations of the multilevel converters is the voltage unbalance between different levels. The techniques to balanc...
متن کاملIntegration of Energy Storage with Cascaded H-bridge Multilevel Inverters
Multilevel converters are mainly utilized to synthesize a desired singleor three-phase voltage waveform. The desired output voltage is obtained by combining several separate dc voltage sources. Solar cells, fuel cells, batteries, and ultracapacitors are the most common independent sources used. Multilevel converters have found wide applications in motor drives, static VAR compensators, and unin...
متن کامل