Delta Electronics (shanghai) Co., Ltd

Sap Se

Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Ling Shi

Jun Li

Cheng Lu

Wenfei Hu

Hong Tao Liu

Hong Liu

Rolf William Albach

Chenxi Zhang

Joern Beaujean

Haichao H Wei

Lutz Boehnke

Erika Zhu

Hua Lu

A method for controlling a distributed power conversion system comprises: configuring N control units for controlling N power modules of the system respectively, wherein each of the control units is configured to execute: step S, generating a first variable Qreflecting respective module serial numbers R according to a coordination variable; step S, generating a second variable Qreflecting the optimal operating number M of the modules; and step S, comparing the first variable Qand the second variable Q, wherein, when the first variable Qis greater than the second variable Q, the corresponding power module stops; and when the first variable Qis less than or equal to the second variable Q, the corresponding power module runs.

Device and method for controlling distributed power conversion system

A method for controlling a power conversion system includes: configuring a carrier period of the power modules, and configuring a phase shift of carrier waves of the adjacent power modules to be 2&#x3c0;/N; selecting M power modules to operate within the carrier period, where O&#x2264;M&#x2264;N, and providing a modulation wave to the power modules, an amplitude of the modulation wave being A/N of a carrier peak of the carrier waves; and comparing the value of the modulation wave with a value of the carrier wave of each of the power modules, respectively, wherein, when the value of the modulation wave is greater than the value of the carrier wave, the corresponding power module runs; when the value of the modulation wave is less than or equal to the value of the carrier wave, the corresponding power module stops.

Control device for power conversion system and its control method

The present application discloses a polyol system for preparing polyurethane comprising: i) at least one active chain extender having at least two groups that can react with an isocyanate, wherein at least one group that can react with an isocyanate is free primary &#x2014;NH2 group; ii) at least one active chain extender having three groups that can react with an isocyanate, wherein at least one group that can react with an isocyanate is free primary &#x2014;OH group, and iii) at least one polyether polyol starting from an amine. The polyol system according to the present disclosure is phase-stable without layering and capable of releasing mold quickly after reacting with an isocyanate to produce polyurethane.

Polyol system for preparing polyurethane

The present invention relates to predominantly (&#x3e;50 vol %) open-cell (to DIN ISO 4590-5 86), cold-deformable, rigid polyurethane foams which possess high acoustic absorption and a uniform cell structure and which are suitable for producing automotive interior trim, more particularly roof linings and pillar trim.

Rigid polyurethane foams with high acoustic absorption

A middle layer in business applications is provided to wrap all the database management operations generically, to store changed data temporarily, to validate and lock the data before updating the database, and to synchronize the data change and unlock it as a whole when a commit method is called. In embodiments, only six generic methods are needed for all data interactions. Transaction, isolation level, exception format, and performance tuning operations can be performed centrally in the six generic methods. A buffer section may be created in the middle layer. Operations such as insert, update, delete, and select are performed on data stored in the buffer. Buffered data may then be stored in a data storage device.

Generic database manipulator

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Shanghai, China

Ling Shi