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DC-link Voltage Control using a TI DSP. National Center of Research and Technological Development (CENIDET) TI Innovation Challenge 2016 Project Report Team Leader: Gabriel Calderón Zavala [email protected] Team Members: Team Gabriel Calderón Zavala 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 GSC control is based in the dq reference frame 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 ISO124 It is used to isolated the DC link voltage stage from the control stage (TI DSP TMS320F28335). 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. DC link Controller The process to design the DC link controller based in vector control is as follows[3]. * vdgl ο½ οvds1 ο« ο¨ Lο·iqg ο« vds ο© * vqgl ο½ οvqs1 ο ο¨ Lο·idg ο© Where vds1 ο½ Ridg ο« L didg dt vqs1 ο½ Riqg ο« L (2) diqg dt (3) The expressions from (3) where used to design the control for the GSC which can be seen in Fig 2. Fig. 2. GSC Control schematic. Meanwhile, the DC link controller design comes from the dq reference frame formulas and is given by: C ducd 3 ο½ m1idg dt 4 2 (4) From this expression the controller to regulate the dc bus is designed and is in cascade with the controller in (3). 3.- DC link control Implementation Now, some images of the dc-link control implementation are showing. In figure 3 the voltage sources used to energize all the circuits involve in the implementation are depicted; it worth to mention that TMS320F28335 SCI interface was used to visualize in real time some important data processed by the DSP. Fig. 3. Voltage sources and SCI interface. In figure 4 it can be appreciated all the stages involved to control de dc-link bus voltage. Fig. 4. Implementation for the dc-link bus voltage control. 4.- Results After all the analysis realized in relation with the abc model of the GSC, the reference frame model and the control scheme, it was possible to carry out a real implementation based mainly on the DSP TMS320F28335. The main objective of the control was to regulate tha dc-link bus voltage at 80 volts. Figure 5 shows how this objective control was reached. Fig. 5. Dc-link bus voltage controlled to 80 volts. (Channel multiplied x10). 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] R. Pena, J. C. Clare, and G. M. Asher, βA doubly fed induction generator using back-to-back PWM converters supplying an isolated load from a variable speed wind turbine,β IEE Proc. - Electr. Power Appl., vol. 143, no. 5, p. 380, 1996. [3] R. Pena, J. C. Clare, and G. M. Asher, βDoubly fed induction generator using back-to-back PWM converters and its application to variable-speed wind-energy generation,β IEE Proc. - Electr. Power Appl., vol. 143, no. 3, p. 231, 1996.