Applied Mechanics and Materials Vol. 733

Abstract: The noise component in power quality signals affects the accuracy of analysis result. This paper presents a new approach for power quality signals de-noising. Firstly, the original signals are transformed by S-transform method. Then, the matrix which is get from S-transform result is processed as a two-dimension image. The global thresholding de-noising method is used to filtering the noise component in the power quality signals. The simulation results showed the effectiveness of the new approach.

Abstract: The STM32F103RB single chip microcontroller as the core, and realizes the positioning and the short message transmission to the Beidou satellite navigation system module, to design the water quality detection control terminal. The actual show, control terminal design, can achieve the positioning system of water testing, acquisition, storage and transmission of sensor data. The extended application, the control terminal can be used to locate other required equipment, storage and transmission of data occasions.

Abstract: Based on the Free scale S12 processor as the main MCU, the article have designed the hardware circuit of the electronic parking brake system control unit, and on the basis I have made the rational analysis of the control of the total the electronic parking brake system. The analysis and experiment results show that the design can realize the basic function of EPB, to a great extent, it also improve the reliability of the system, fault self-checking ability and delayed its working life and just right to satisfy the most basic and most critical requirements of the system: As part of the braking system, it should have the reliability and security.

Abstract: When Electronic Parking Brake test bench validates the function of ramp start, Electronic Parking Brake (Simplified as EPB) control motor has been blocked state, the motor heat is large. Followed putting forward the performance required by the motor cooling system, and the cooling control system scheme and the control strategy of intelligent electronic pump motor by building a mathematical module about cooling system of EPB motor, this paper designs and develops the electronic water pump motor controller, including the efficient control on the pump, and the communication with the main controller, which is based on CAN bus and SAE J1939 and optimizes the hardware and software of motor controller so that the pump efficiency may reach 32%. The product-level design, shown by a large number of performances testing, is achieved.

Abstract: Sustainable exploration and use of energy source depend on discovery of new energy source and development of novel energy devices. As a kind of energy storage device, supercapacitors have many advantages over conventional batteries: high power density, long cycling stability, fast charge-discharge rate and being environment friendly. However, common problems involved with nanomaterials such as bad structural continuity, conglomeration and structural instability have restricted their application in supercapacitors. We have conducted the design, synthesis and performance research of the electrode materials containing. We demonstrate the above composite materials have wide prospect for application in the supercapacitors as well as other similar fields.

Abstract: In the three-phase four-wire low-voltage micro grid, three-phase imbalance usually happens because of a large number of single-phase loads. In this situation, the traditional control method cannot effectively control the voltage and frequency stability when the low-voltage micro grid operates in the island mode. According to the characteristics of the three-phase four-wire low-voltage micro grid, this paper designs a single-phase independent control based on the droop control. This paper firstly uses the improved droop control considering that the impedance characteristic of the low voltage micro gird is mainly resistance, and also designs single-phase independent control to ensure the control system have the ability to run under the unbalanced loads. Then this paper designs a two-level control strategy to control the voltage and frequency in the micro grid during the island operation. Finally, a simulation analysis based on the proposed method is used to prove the effectiveness. A micro grid is set up on PSCAD, and verifies the effectiveness of the single-phase control strategy based on the improved droop control. The proposed method can also realize the requirement of the voltage and frequency stability during the island operation. At the same time, the control method proposed in this paper can achieve the control objective under the condition of unbalanced three-phase.

Abstract: This device uses TMS320F28027 as the control core. It realizes functions of MPPT, frequency and phase synchronization, under voltage and over current protection, under voltage recovery and so on. It displays its main information on the LCD screen, providing a good man-machine interface. The topology of the main circuit is full bridge inverter which is controlled by doubled frequency SPWM modulation. MPPT is realized with constant input voltage method. Phase tracking is realized with software PLL. The performance of this device is satisfying. The relative voltage error is less than 0.7% when doing MPPT. The relative frequency error is less than 0.09%. The phase error is approximately 2°. The THD of the output voltage is less than 2%. The action voltage of the under voltage protection is 25.02V. The action current of the over current protection is 15.0A. The efficiency of this device is over 84%.

Abstract: With the increasing development of railway transportation, the wheel-rail wearing problem is becoming more and more serious while the increasing of both the operating speed and loading weight of railway vehicles. Active radial bogie is one of the hotspots for research in the area of decreasing the wheel-rail wearing issues. Meanwhile, the energy dissipation problem has been restricting its development. This paper puts forward a novel energy-harvesting active radial bogie for rail vehicles. Making use of the hydraulic electromagnetic energy-regenerative shock absorber, the vertical vibration energy could be harvested while train is traveling. Detailed study and evaluation for this active radial bogie will be presented. The tests and simulation results prove the effectiveness of the proposed bogie mechanism and control.

Abstract: This paper describes standard model for Smart Grid Home Energy Management System (HEMS). It is presently absence from the requirement of the service and standard model. Generally HEMS provides energy management consulting service based on digital home environments and defines the essential requirement. It also provides the guideline of the related technology development and infrastructure. We proposed the use cases and the communication requirement that component of devices and interface for home energy management system.

Abstract: This paper is on the basis of energy-consumption analyses and indicators competition system of a provincial branch electric power group, introduced how to integrate the existing power plant isolated SIS information and promote the economic operational level reached a new standard by indicators competition between units. Firstly, the paper introduced the overall network deployment of the system and the function and configuration of servers; secondly, compared with past SIS system, introduced some of the functional improvement project under the charge of electric power group; finally analyzed and prospected the application of this system.