In the above two cases, there is always some energy loss during the power generating system operation. To obtain both wind and solar energy at the same time, a microproces­sor and two batteries as shown in Fig. 5 are employed to control the charging operation from both energy sources. Figure 11 displays the circuit in […]

In order to acquire both wind and solar energy at the same time, the system is config­ured as in Fig. 4. As seen in Fig. 10(a)-(c), the wind to solar charging duty cycle ratio is changed to examine the charging behavior at three wind speeds. Owing to fluctuations in wind speed at 3 m/s, the […]

In this study, a 250-W permanent magnet alternator driven by wind turbine and a 12- V/75-W solar cell panel were used as the wind and solar energy source, respectively. Both energy sources were output to 12-V/75-AH lead batteries, which were kept in under­charged condition before test. In the experiment, a 100- MHz scope was employed […]

3.1.Source resistance measurements To measure battery source resistance, as shown in Fig. 6(a), a 12-V/75-AH battery supplied the load through a switch. We adjusted theload resisdancrdkL to change the battery discharging current Ib. From the voltage difference Eb – Vo and Ib, the source resistance rb can be determined. Because the solar energs is much […]

Owing to the large variation in the wind and solar energy, the converter is employed to provide the stable power for normal application. When only one energy source supplies the load, as shown in Fig.1(a), the voltage and frequency of the converter output is adjusted to meet the load specification. In Fig. 1(b), both wind […]

Mu-Kuen Chen and Chao-Yuan Cheng Additional information is available at the end of the chapter http://dx. doi. org/10.5772/54495 1. Introduction Large wind turbines use mechanical systems, such as geared or gearless devices to increase the speed of the generator. In addition, an inverter is employed to adjust the output voltage to exceed the grid value. […]

There are many tasks, which have to be done, such that energy management can be con­ducted accurately. The following, we list the mandatory tasks required in energy manage­ment for solar cell system. First of all is current monitoring flow-in to and flow-out from the battery bank. The second one is measuring electrical energy content inside […]

Discharging process can approximated by using a Constant Voltage Source Circuit Model as illustrated on Fig 19 below. The reason we use Constant Voltage Source circuit model, be­cause there is a fact that at condition of near to empty, the battery (without load) still has voltage that close to peak voltage when battery at the […]