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Rotor Side Converter Control for a Wind Energy Conversion System. National Center of Research and Technological Development (CENIDET) TI Innovation Challenge 2016 Project Report Team Leader: Adolfo Rafael López Núñez [email protected] Team Members: Team Adolfo Rafael López Núñez Team [email protected] Advising Professor: Rodolfo Amalio Vargas Méndez [email protected] The penetration of the Wind Energy Conversion Systems (WECS) is connected to the advancement of power electronics, which has permitted the development of efficient and low cost WECS in the last decades. A WECS configuration that has great attention is based on a doubly fed induction generator (DFIG) and a back to back (B2B) converter, the back to back converter is constituted by a Rotor Side Converter (RSC) and a Grid Side Converter (GSC). The RSC control is based in the dq reference frame model, which is based in the DFIG model. This model gives the necessary equations to implement the control which is implemented in a TI TMS320F28335 DSP. Qty. List all TI analog IC or TI processor part number and URL 1 TMDSDOCK28335TMS320F28335 This TI DSP is used in the acquisition of the sensors signals and to give the commutation signals to the IRAM IGBT modules. 3 HCPL2631 Optocouplers used to isolate the control stage from the power stage. It provides the gate signals from the DSP to the IRAM module. 3 TL084 It is used to condition the signals from the hall effect sensors; it is also used to condition the voltage sensors signals and to implement analog active filters. 1 TL082 It is used to condition the signals from the hall effect sensors; it is also used to condition the voltage sensors signals and to implement analog active filters. 1.- DFIG configuration system B2B is constituted by a Rotor Side Converter (RSC), a grid side converter (GSC) and a capacitive dc bus between both converters, see Fig. 1. In a grid connected WECS based in a DFIG and a B2B, the RSC controls the transfer of active and reactive power between the stator of the DFIG and the network, while the GSC controls the reactive power through the converter and the voltage in the dc bus [1]. Fig. 1. WECS diagram based in a DFIG and a B2B The DFIG three-phase model of the back to back converter can be written in a dq arbitrary reference frame [2]: π£ππ = ππ πππ β ππππ + πΜππ π£ππ = ππ πππ + ππππ + πΜππ π£ππ = ππ πππ β (π β ππ )πππ + πΜππ π£ππ = ππ πππ + (π β ππ )πππ + πΜππ πππ = (πΏππ + 32πΏππ )πππ + 32πΏππ πππ 3 3 3 3 3 3 (1) πππ = (πΏππ + 2πΏππ ) πππ + 2πΏππ πππ πππ = (πΏππ + 2πΏππ ) πππ + 2πΏππ πππ πππ = (πΏππ + 2πΏππ ) πππ + 2πΏππ πππ where π£π,ππ and π£π,ππ are the stator and rotor voltages in the dq frame; ππ,ππ and ππ,ππ are the stator and rotor currents in the dq frame; ππ,ππ and ππ,ππ are the stator and rotor flux linkages in the dq frame; ππ is the stator resistance; ππ is the rotor resistance; πΏππ is the stator inductance; πΏππ is the rotor inductance; πΏππ is the mutual inductance; ππ is the rotor speed; and π is the angular speed of the reference frame. 2. RSC Controller The process to design the RSC controller based in vector control is as follows [1]. Given that the selected reference frame is the stator flux, the obtained equations are: didr ο ο¨ο· ο ο·r ο© ο³ LR iqr dt di vqr ο½ rr iqr ο« ο³ LR qr ο« ο¨ο· ο ο·r ο©ο¨ LM ims ο« ο³ LR idr ο© dt vdr ο½ rr idr ο« ο³ LR (2) From (2) it is possible to get the next subsystems: vdr1 ο½ rr idr ο« ο³ LR didr dt vqr1 ο½ rr iqr ο« ο³ LR diqr (3) dt The expressions from (3) where used to design the control for the RSC which can be seen in Fig 2. Fig. 2. RSC control diagram. 3.- RSC Implementation The figure 3 shows the RSC implementation, which is controlled by the TI TMS320F28335 DSP, this converter contains the TI HCPL2631 Optocoupler/Optoisolator . Fig. 3. RSC controller The complete implemented system is shown is Fig 4, with the TI TMS320F28335 DSP and the TI TL084 and the TI TL082. Fig. 3. RSC controller 4.- Results The figure 3 shows the rotor current and the rotor voltage at a rotor speed of 3200 rpm. 5.- Bibliography [1] G. Calderón, J. Mina, and A. López, βModelado y simulación de un Sistema de Conversión de Energía Eólica de velocidad variable interconectado a la red eléctrica .,β XVI Congreso Latinoamericano de Control Automático, 2014. [2] P. C. Krause, O. Wasynczuk, and S. D. Sudhoff, Analysis of Electric Machinery and Drive Systems, Second. John Wiley and Sons, 2002.