Chang-bao Zheng

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The solar street lamp system using GPRS and ZIGBEE technology is designed in this paper. The street lamp management system is composed of GPRS wireless mobile network and ZIGBEE short-distance wireless network. Users can view the real-time parameters of street lamps on the computer (or mobile phone), and at the same time, can also set up some working(More)
The three-level active-neutral-point-clamped (3L-ANPC) inverter is used to solve the problem of uneven loss distribution in the three-level neutral-point-clamped (3L-NPC) inverter. Labview is widely used for industrial monitoring. As a common industrial bus, RS485 is used to connect and control several devices. MLX906I4 is an infrared thermometer for(More)
Voltage differential feedback control system based on repetitive control is proposed in this paper. The scheme, which can improve the dynamic characteristic and steady state performance by Capacitor voltage as outer loop while its differential as inner loop without current sensor, is achieved on a three-phase PV inverter with TMS320F2808. Two different(More)
This paper describes the characteristics of cascaded converter and details the work of cascaded H-bridge multilevel converter which use phase shifted carriers pulse width modulation. Use cascaded H-bridge multilevel converter instead of ordinary inverter, we can get a photovoltaic power generation system which has a multilevel output voltage. The PV system(More)
Based on the theoretical model of three-level converters, a mathematical model of the predictive active power and reactive power control is deduced. Relationship of both active power and reactive power with voltage vectors is analyzed from an instantaneous power perspective. Influence and tendency caused by voltage space vectors on the active power and(More)
Photovoltaic power generation technology is already quite mature. But the conversion efficiency of the silicon cells which are heavily used now remains stagnant. Besides, large amounts of energy will be consumed during the process of production. It also makes serious pollution. Thus, to maximize utilization of solar cells will undoubtedly have a huge(More)
The three-level active-neutral-point-clamped (3L-ANPC) voltage source converter (VSC) is used to overcome the uneven loss distribution. In 3L-ANPC VSC the dissipation in the power device is typically characterized by Sinusoidal Pulse Width Modulation (SPWM). The junction temperature and the load current of an actual power converter system are detected to(More)
A photovoltaic controller is a converter which can transform the energy generated by photovoltaic cells and control the battery charging and discharging. The maximum power point tracking (MPPT) technology can maximize the efficiency of photovoltaic cell and effectively improve the efficiency of photovoltaic power generation system. The single-phase buck(More)
Buck-boost constant current driving circuit is a flexible LED driving power supply, which can work properly in two modes of buck boost and boost. Buck-boost LED constant current drive circuit can adjust the operating mode according to vatiation of the load current to ensure that the output current is constant. The buck and boost topology structure is(More)
Ultracapacitor is widely used in EVs for its high performance such as high power density, long cycle life and wide working temperature. However, the frequent use and variation of the operating temperature will affect the performance parameters of ultracapacitor and the variation trend of the ultracapacitor's performance in this situation is always different(More)