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=Li q qq International Journal of Fuzzy Logic Systems (IJFLS) Vol.2, No.3, July 2012 the angular speed, rs is the stator resistance. The flux linkage of PMSM can be expressed as, d =Ldid +PM (3) Where, Ld, Lq are d and q axis inductances, ψPM is the permanent magnet rotor flux linkage, The electromagnetic torque equation of the PMSM is given as [12], T = 3 p ( i − i ) edqqd 2 Where p is the number of pole pairs, the motion equation is expressed as, Te =JdΩ+BΩ+TL dt Ω= p (4) (5) (6) Where, ψPM is the rotor flux linkage, J is the moment of inertia, B is the damping torque and TL is the motor load. 3. POWER ELECTRONICS CONVERTER The power electronics interfacing is a critical component in the single shaft microturbine design and represents significant design challenge, especially in matching turbine output power to the connected load or grid. There are different configurations available to interface the MTG power to load. One possible is to use a three phase diode rectifier, voltage source invert and filter. This requires a separate start-up arrangement for the microturbine. The configuration used in this paper is assumed to be brought to rated speed for the isolated mode of operation and bidirectional power converter has been used for the grid connected mode of operation. For a single shaft microturbine the power interfacing circuit is used to convert high frequency AC power produced by the PMSM into usable electrical power. The power conditioning circuit is one of the critical components in a single shaft microturbine design and represents significant challenge in design. Especially in matching turbine output to required load. The control structure for grid connected mode of operation is shown in Figure 4. The grid side converter operates as a controlled power source. The standard PI controller is used to regulate the grid current in the dq synchronous frame in the inner control loops and the DC voltage regulator in the outer loop. It is seen that a PI controller regulates the DC bus voltage by imposing an id current component. Id represents the active power component of the injected current into the grid and iq is it reactive component. In order to obtain only a transfer of active power only a transfer of active power, the id current reference set to zero. The decoupling terms are used to obtain independent control of id and iq in. A PLL is used to synchronize the converter with the grid. The philosophy of the PLL is that the difference between the grid phase and inverter phase angel can be reduced to zero using PI controller and locking the line side inverter phase to grid [8]. 45PDF Image | PERFORMANCE OF FUZZY LOGIC BASED MICROTURBINE GENERATION SYSTEM CONNECTED TO GRID/ISLANDED MODE
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