Driving device of mobile medium and low voltage circuit breaker with permanent magnet
On trial-actual trial
ApplicationNo.: 201410165014.9 Application Date: 20 14-04-23.
A permanent magnet movable driving device for medium and low voltage circuit breakers consists of opening winding, moving iron core, permanent magnet, fixing device, closing winding, static iron core and driving connecting rod. The open winding is wound on the upper part of the static iron core, and the closed winding is wound on the lower part of the static iron core; The movable iron core adopts an I-shaped structure; Permanent magnets and fixing devices are embedded around the moving iron core, wherein the fixing device is embedded in the middle of the moving iron core, and two permanent magnets are embedded on the moving iron cores at two ends of the fixing device respectively; The driving connecting rod and the movable iron core are connected into a whole. The permanent magnet of the device of the invention is embedded in the moving iron core and works together with the winding magnetic field to shorten the transition process of opening and closing and quickly reach the limit steady state. The invention can be used for the protection of power system substations, railway traction substations and various feeders.
Applicant: East China Jiaotong University
Address: 3300 13, No.808 Shuang Gang East Street, Nanchang, Jiangxi.
Inventors (designers): Peng Chunhua, Wang Kui.
Risk control method of smart grid bidding power generation
On trial-actual trial
ApplicationNo.: 201310442914.9 Application Date: 20 13-09-26.
The invention relates to a risk control method of smart grid bidding power generation, which considers the real-time influence of bidding behavior of power producers on market electricity price from the perspective of power producers, and establishes a new real-time correction mechanism of power producers' market electricity price forecast based on wavelet decomposition reconstruction and differential evolution support vector machine theory. Then, based on the real-time correction module of electricity price prediction and the quantitative evaluation module of bidding risk, a new dynamic adaptive control mechanism of bidding risk feedback compensation is established by using the feedback compensation control principle and fast PID incremental algorithm, which realizes stable and reliable dynamic adaptive control of bidding risk, drives the joint optimization of the output of bidding price random groups in each trading day, and provides key risk control method support for the generation side in smart grid to realize low cost, energy saving and emission reduction and low risk and high yield online bidding. The invention is suitable for multi-objective optimal bidding power generation at the power generation side in the smart grid environment.
Applicant: East China Jiaotong University
Address: 3300 13, No.808 Shuang Gang East Street, Nanchang, Jiangxi.
Inventors (designers): Peng Chunhua and Sun Huijuan.
Circuit and method for realizing soft turn-off and energy feedback of converter switch tube
In trial operation
ApplicationNo.: 20 14 10705656.3 Application Date: 2014-1-28.
Circuit and method for realizing soft turn-off and energy feedback of converter switch tube. The circuit consists of buffer capacitor, energy storage capacitor, inductor, diode, transformer and auxiliary switch tube. The buffer capacitor realizes the soft turn-off of the protected switch tube. When the protected switch tube is turned on, the energy of the buffer capacitor is transferred to the storage capacitor through the protected switch tube, inductor and diode. Whenever the protected switch tube is turned on, the voltage of the energy storage capacitor gradually rises. When the voltage of the energy storage capacitor rises to the highest threshold voltage, the auxiliary switch tube acts, and the energy of the energy storage capacitor is quickly transferred to the DC absorption link through the transformer to realize energy feedback. A converter can have multiple circuits corresponding to different protected switches. The invention can not only realize the soft turn-off of the protected switch tube, but also feed back the energy in the buffer capacitor to the DC side of the circuit with less loss, which is simple and easy to implement, and can improve the switching frequency of the high-frequency converter and reduce the circuit loss.
Applicant: East China Jiaotong University
Address: 3300 13, No.808 Shuang Gang East Street, Nanchang, Jiangxi.
Inventor (Designer): Yuan Yisheng Peng Chunhua