CCS/TMS320F28335: orthogonal signal generator from spll library

Tool/software: Code Composer Studio

Dear Sir,

I want to generate orthogonal signals(alfa, beta, zero) from single-phase grid voltage. For this, I am using the SPLL library. In this library, I am unable to find which variables belong to alfa, beta, and zero components. I am using the attached  structure, please help me in this regard.

typedef struct{
    float32_t   u[3];       //!< AC input data buffer
    float32_t   osg_u[3];   //!< Orthogonal signal generator data buffer
    float32_t   osg_qu[3];  //!< Orthogonal signal generator quadrature data buffer
    float32_t   u_Q[2];     //!< Q-axis component
    float32_t   u_D[2];     //!< D-axis component
    float32_t   ylf[2];     //!< Loop filter data storage
    float32_t   fo;         //!< Output frequency of PLL(Hz)
    float32_t   fn;         //!< Nominal frequency (Hz)
    float32_t   theta;      //!< Angle output (0-2*pi)
    float32_t   cosine;     //!< Cosine value of the PLL angle
    float32_t   sine;       //!< Sine value of the PLL angle
    float32_t   delta_t;    //!< Inverse of the ISR rate at which module is called
    SPLL_1PH_SOGI_OSG_COEFF osg_coeff; //!< Orthogonal signal generator coefficient
    SPLL_1PH_SOGI_LPF_COEFF lpf_coeff; //!< Loop filter coeffcient structure
} SPLL_1PH_SOGI;