Shanghai Jiaotong University

Other

Jianwen Zhang

Gang Shi

Xu Cai

Han Wang

Jianqiao Zhou

Weixin Fang

Jing Lv

Yang Zhao

Lu Zheng

Wei Lv

Yao Qin

Yunfeng Cao

Yuehua Li

Yixin Zhang

Jiacheng Wang

Haoshu Shao

The present invention discloses a modular intelligent combined wind power converter and a control method thereof. The modular intelligent combined wind power converter comprises separate bridge arm power units, wherein a plurality of the bridge arm power units are connected in parallel to form a high-capacity bridge arm power module, three bridge arm power modules form a three-phase full-controlled bridge power module, and the three-phase full-controlled bridge power module comprises an electric reactor, a capacitor, a fuse and a circuit breaker to form a basic converter module, and the basic converter module forms a high-capacity wind power converter through a modular intelligent combination method.

Modular intelligent combined wind power converter and control method thereof

Disclosed is a solid-state transformer having an uninterrupted operation ability under an AC/DC fault, in which bridge arms of a hybrid modular multilevel converter include half-bridge submodules and full-bridge submodules. The half-bridge submodules and the full-bridge submodules are connected with input ends of isolated dual-active-bridge converters via DC capacitors of the half-bridge submodules and full-bridge submodules; output ends of the isolated dual-active-bridge converters are connected in parallel to form a low-voltage DC bus; and a three-phase full-bridge inverter is connected to the low-voltage DC bus. The solid-state transformer may be provided with four ports including a medium-voltage AC port, a medium-voltage DC port, a low-voltage DC port and a low-voltage AC port which are beneficial to the interconnection of multi-voltage-level and multi-form AC/DC hybrid distribution grids. The solid-state transformer has the uninterrupted operation ability under the AC/DC fault.

Solid-state transformer having uninterrupted operation ability under AC/DC fault and control method thereof

A modular multilevel converter with multi-port DC power flow control includes a modular multilevel converter topology and a DC power flow controller, wherein an input terminal of the DC power flow controller is connected in series to uppermost submodules of upper arms of the modular multilevel converter topology, and with power transfer and energy interaction between the modular multilevel converter topology and an AC power grid, a converter station or a solid state transformer based on the modular multilevel converter topology has a function of direct current power flow control. The output terminal of the DC power flow controller adopts DC/DC converters to regulate the output voltage, and a plurality of DC/DC converters share a common DC bus with the ports connected with different DC outlet lines, thereby providing a plurality of flexible and controllable DC ports.

Modular multilevel converter with multi-port DC power flow control and control method thereof

A plasma oil-free ignition system in oxygen enriched environment comprises a plasma generator and a burner. The plasma oil-free ignition system comprises a sleeve group coaxially arranged with the burner, and the sleeve group comprises multiple coaxially sleeved sleeves. Annular spaces are formed between adjacent sleeves and between the sleeves and the burner. Oxygen ducts are arranged on the sleeves, and oxygen ducts are arranged on the burner. Plasmas jetted by the plasma generators form a local high temperature zone filled with high temperature plasma and pulverized coal air flow. A certain amount of oxygen is fed to the burner through the oxygen duct therein to form local oxygen enriched zones in the annular spaces and the subsequent adjacent spaces through which air flows, thus realizing oxygen enriched combustion of volatile matters or coke or mixture thereof, and combustion the pulverized coal air flow more intensely to release more heat so as to ignite the primary air pulverized coal air flow quickly and burn the pulverized coal air flow stably. The invention has simple structure, is applicable to different coal types, especially applicable to the plasma oil-free ignition system in oxygen enriched environment of coal types with low volatile matters.

Plasma oil-free ignition system in oxygen enriched environment

Growing community of inventors

Shanghai, China

Jianwen Zhang