Shanghai Jiao Tong University

Loongson Technology Corporation Limited

Longsoon Technology Corporation Limited

Guojie Li

Keyou Wang

Lijun Hang

Xiuchen Jiang

Lin Feng

Bei Han

Anping Tong

Xiaoyu Li

Jin Xa Xu

Pan Wu

Weiwu Hu

Zirun Li

Jin Xu

Xin Huang

Jingzhou Xu

Menghao Su

Electromagnetic transient simulation method applicable to a field programmable gate array (FPGA), which integrates topological parameters of a circuit to be simulated into two matrix parameters in an initialization stage thereof; and voltage and current information at each simulation moment can be obtained only through simple matrix multiplication operation in a main part of the simulation cycle thereof. The method avoids complex initialization operation in the field programmable logic array; meanwhile, the flow of the main part of the simulation cycle in the FPGA is maximally compressed, and the efficiency of electromagnetic transient simulation based on the FPGA is greatly improved.

Electromagnetic transient simulation method for field programmable logic array

A hybrid electromagnetic transient simulation method for microgrid real-time simulation, wherein a traditional node analysis method (NAM) and a highly parallel latency insertion method (LIM) are combined, so that the microgrid is firstly divided from a filter of a distributed power generation system to form one latency insertion method (LIM) network containing a power distribution line and a plurality of node analysis method (NAM) networks containing the distributed power generation system respectively, the NAM network being simulated by traditional node analysis method, the LIM network being simulated by the latency insertion method, in an initialization stage, one correlation matrix and four diagonal matrixes containing line parameters used for LIM network simulation being formed according to line topology and parameters of the microgrid, in a main cycle of the simulation, the LIM network solved simultaneously with multiple NAM networks, a parallelism of a microgrid simulation being improved.

Hybrid electromagnetic transient simulation method for microgrid real-time simulation

A diode clamp mixed three-level dual-active full-bridge converter based on a dual active full-bridge converter, an additional control variable is added by replacing two-level bridge arm on the primary side with a diode clamp three-level bridge arm. A control method based on four variables including duty ratios of 0 voltage level and high voltage level of the primary side, duty ratio of 0 voltage level of the secondary side of the diode clamp mixed three-level dual active full-bridge converter, and phase shift ratio between primary and secondary sides of the diode clamp mixed three-level DAB converter; four-degree-of-freedom globally optimized control is realized by coordinating four variables, RMS value of the current is reduced, and operating efficiency of the converter is improved. Closed-loop control of the DAB globally optimized operation is given, which enables the converter to automatically realize globally optimized operation under different operating conditions.

Diode clamp mixed three-level dual active full-bridge converter and control method thereof

Nonlinear control method for the micro-grid inverter with anti-disturbance. By generating reference currents that satisfy specific active and reactive power command under various working conditions, and introducing a nonlinear control method based on Lyapunov function to control the inverter, fast and accurate tracking of the generated reference signals is realized. The method realizes effective decoupling control of active power and reactive power. The system has high dynamic response and good robustness. Besides, the control structure of the method is simple and easy to implement, and the synchronous control link and the additional voltage and current regulator are omitted. The method realizes fast and accurate power exchange and stable power transmission between the inverter and the grid in the micro-grid under various working conditions, and provides a guarantee for improving the energy management efficiency within the micro-grid.

Nonlinear control method for micro-grid inverter with anti-disturbance

A current sensorless control system and a control method thereof for single stage isolated PFC converters based on DAB. By coordinating three control variables of the DAB converter, that is, the inside phase-shifting ratio of the primary side full-bridge, the inside phase-shifting ratio of the secondary side full-bridge, and the phase-shifting ratio between the primary and the secondary sides, the present invention does not need to design additional current controller for the control of the input current, and may make the input current sinusoidal by directly coordinating the output voltage controller, the input voltage and the current modulation step, thereby reducing system cost and the difficulty of controller design, enhancing the stability of the control system, and improving the dynamic performance.

Current sensorless control method for DAB-based single stage isolated PFC converters

A globally optimal close-loop controlling method for a triple-phase-shift modulated DAB converter, which is based on three control variables of the internal phase shift ratio of the primary side full bridge, of the internal phase shift ratio of the secondary side full bridge, and of the phase shift ratio between the primary and the secondary side, of a DAB (dual active bridge-isolated bidirectional DC/DC dual active bridge-isolated bidirectional DC/DC) converter, enabling the DAB to automatically realize global optimal operation via close-loop controlling means under various conditions, thus raising DAB efficiency. The method of close-loop control with global optimization for the DAB has a good controlling performance.

Globally optimal close-loop controlling method for triple-phase-shift modulated DAB converter

A feedforward voltage series compensator based on complimentary use of wind, solar, and electric power comprising a controller, a rectifier unit, an H bridge inverter, a series transformer, a wind-power DC voltage sensor, a wind-power DC current sensor, an AC voltage transducer, a DC boost unit, a PV DC voltage sensor, a PV DC current sensor, and a grid-connected inverter. The compensator makes use of wind-electric and photovoltaic-electric complimentary interactions to solve the traditional energy issue for series compensator, and as the grid-connected inverter is feedforward, there is extra capacity for the series transformer and the series complimentary inverter unit, and hence it enjoys the feedforward and quick voltage complimentary characteristics of the wind and solar power generation.

Feedforward voltage series compensator based on complementary use of wind power and photovoltaic power

A method for designing cascaded multi-level inverters with minimization of large-scale voltage distortion, based on KKT (Karush-Kuhn-Tucker) conditions and with simplified computation of conduction angles, simplifies the computation process, and is conducive to on-line calculation. Meanwhile, its fundamental voltage is adaptive, minimization of total harmonic is realized for cascaded multi-level inverters at high-voltage, and voltage power quality at grid connected nodes is improved.

Method for designing cascaded multi-level inverter with minimized large-scale voltage distortion

The present invention discloses a RISC processor and a method of processing flag bits of a register in the RISC processor. Said RISC processor comprises a physical register stack, an operating component connected to the physical register stack and an decoder connected to the operating component; the physical register stack comprises an emulation flag register for emulating to realize flag bits of a flag register in a CISC processor; the operating component comprises a flag read-write module for reading and writing the values of the flag bits of the emulation flag register. The operating component further comprises an operating controller for performing an operation control according to the values of the flag bits of the emulation flag register when the RISC processor is in the working mode of X86 virtual machine during an operation process.

RISC processor and its register flag bit processing method

A RISC processor apparatus and method for supporting an X86 virtual machine. The RISC processor includes: an instruction module for storing a virtual machine instruction set that supports the X86 virtual machine; a decoder for, during the decoding of an instruction of the virtual machine instruction set, distinguishing the virtual machine instruction set mode of the instruction, decoding the instruction according to the distinguished virtual machine instruction set mode, and outputting the decoded instruction to a fixed-point operation component or a floating-point operation component according to the distinguished virtual machine instruction set mode; the fixed-point operation component for processing the fixed-point instruction of the virtual machine instruction set according to the output of the decoder and outputting the execution result; the floating-point operation component for processing the floating-point instruction of the virtual machine instruction set according to the output of the decoder and outputting the execution result.

Growing community of inventors

Shanghai, China

Guojie Li