Original scientific paperThis paper presents a regenerative cascade inverter topology with direct active power control scheme. From the mathematical model of the proposed regenerative cascade inverter, the instantaneous active power and reactive power are derived. Based on the instantaneous abc theory, direct active power feed-forward control is proposed to reduce AC power and voltage fluctuation in DC link. Moreover, a load current full order observer is established to avoid the inconvenient of the current sensor installation. The proposed control scheme is analyzed theoretically by simulation, and verified experimentally. Key words:Regenerative cascade inverter, Direct active power control, Feed-forward control, Observer Upravljanje aktivnom snagom regenerativnog kaskadnog invertera uz smanjenje izmjenične komponente snage u istosmjernom meîukrugu. U ovome radu predstavljena je topologija regenerativnog kaskadnog invertera sa shemom direktnog upravljanja aktivnom snagom. Trenutna aktivna i reaktivna snaga dobiveni su iz matematičkog modela predloženog regenerativnog kaskadnog invertera. Na temelju abc teorije, predloženo je unaprijedno upravljanje aktivnom snagom kako bi se smanjila izmjenična komponenta snage i promjena napona u istosmjernom meîukrugu. Ugradnja senzora za mjerenje struje izbjegla se razvijanjem observera punog reda. Predložena shema upravljanja testirana je simulacijski i eksperimentalno.Ključne riječi: regenerativni kaskadni inverer, upravljanje aktivnom snagom, unaprijedno upravljanje, observer

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A new readout method of focal plane array -correlated readout is presented for the first time. The interface circuit of this method is modeled as to charge and discharge the integration capacitor according to a control signal. Combined with an optical modulator, this readout method will be able to increase image's dynamic range and signal-to-noise ratio more effectively for strong background application. It will not only increase the output voltage swing but also attenuate noises that have lower frequency than the modulation frequency. Several interface circuits are designed and studied. SPICE simulation results show that correlated capacitive transimpedance amplifier (CTIA) may become a very promising correlated readout circuit. In order to study this new method experimentally by visible imager, a 16x 16 silicon CMOS FPA demo chip has been designed, along with a test system. The application of this method on solar megnetograph measurement is discussed.

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