Conclusions

In this chapter a preliminary frequency converter controller has been developed for the validated model of the Lagerwey LW-50/750 synchronous generator. It has been shown that, under the assumptions made, the generator plus conversion system can be viewed as an (almost) instantaneous torque source within the specified bandwidth using single loop PI current controllers. No effort has been put in to either minimize the power losses or to reduce the effect of disturbances. It is expected that the performance can be even further improved (or harmonic content can be reduced) by designing more advanced controllers (e.g. MIMO current controllers) that exploit the interaction which exists between the d and q components of the stator voltage and current.

Time [sec]

Figure 6.5: Normalized electromechanical torque response of Pi-controlled Lagerwey LW-50/750 synchronous generator to a number of stepwise changes in the torque set-point TSme.

Time [sec]

Figure 6.5: Normalized electromechanical torque response of Pi-controlled Lagerwey LW-50/750 synchronous generator to a number of stepwise changes in the torque set-point TSme.

0.8408 0.84 0.8392

JL 0.8384

0.8376 0.8368 0.836

1.5 1.5005 1.501 1.5015 1.502 1.5025 1.503 Time [sec]

Figure 6.6: Zoom around the second stepwise changes.

1.5 1.5005 1.501 1.5015 1.502 1.5025 1.503 Time [sec]

Figure 6.6: Zoom around the second stepwise changes.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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