Openloop analysis

First an open-loop analysis is performed on the identified, verified and validated model of the Lagerwey LW-50/750 synchronous generator to determine possible control strategies. Consider the (open-loop) Bode magnitude diagram from inputs ud, uf, and uq to outputs id, if, and iq shown in Fig. 6.4 (be aware of the different scales of the y-axes). The solid lines correspond to the standstill case; the dashed lines to the case in which the synchronous generator is rotating at rated speed (i.e.

wm « 2.82 [rad/s], see Table A.4 on page 226). The Bode magnitude plot is created by selecting the appropriate inputs and outputs from the identified synchronous generator model, and subsequently linearizing it about the aforementioned operating points. As the plots reveal, the synchronous generator dynamics strongly depend on the mechanical rotational speed wm. As expected, there is no interaction between the direct-axis and the quadrature-axis at standstill.

Figure 6.4: Open-loop Bode magnitude diagram from inputs Ud, Uf and uq to outputs id, if and iq. ¡Solid! lines: standstill case, and dashed lines: synchronous generator rotating at rated speed (wm « 2.82 [rad/s])
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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