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The hydraulic wind turbine could not directly generate electricity after being connected to the grid, it was necessary to control the active power. The wind energy had randomness and volatility. The system had time-varying and nonlinear characteristics, and it was necessary to solve the accurate control of the active power of the fans under external disturbances. The nonlinear problem of the hydraulic main drive system was solved by feedback linearization. The nonlinear disturbance observer was used to quickly and accurately observe the influences of external disturbances on the output power of the system. An active power compensation controller under mismatched disturbances was proposed to accurately compensate the influences of disturbances on the output power of the system, and the active power control strategies of the hydraulic wind turbine were obtained. Based on the semi-physical simulation experimental platform of 30 kV * A hydraulic wind turbine, the output active power of the unit may accurately follow the target speed changes. The absolute error of active power is as + 0.05 kW, and the steady-state errors are within the range of 3%~5%. [ABSTRACT FROM AUTHOR]

Aimed at the practical operation problems of tail gas treatment unit in Puguang natural gas purification plant, the lightening process of hydro-treating heater is optimized by field measurement, chemical analysis, test comparison and other analysis method. The vibration reason of tail gas incinerators is studied and a solution is introduced. After analyzing the chemical compositions of tail gas from chimney, the water content of tail gas is decreased. Excessive sulfur dioxide content of exhausted tail gas is also inhabited by taking measures. The solution of the above problems can guarantee the smooth and efficient running of tail gas treatment unit. [ABSTRACT FROM AUTHOR]

Objective: To investigate the long-term results of the clamp technique of the posterior chamber intraocular lens (IOL) on the anterior capsule of lens in cases with big rupture of posterior capsule of lens., Methods: The clamp technique of the posterior chamber IOL on the anterior capsule of lens were performed on 48 eyes of 48 cases with big rupture of the posterior capsule of lens following extracapsular cataract extraction for senile, traumatic, complicated and diabetic cataract. After 3-60 months follow-up, the vision acuity, position of IOL, capsular opacity and post-operative complications were investigated., Results: The visual acuity of 39 eyes (81.3%) was >/= 0.5. The position of all IOL was in the optical center. The complications, such as after-cataract, retinal detachment, secondary glaucoma and persistent uveitis were not found., Conclusion: The clamp technique of the posterior chamber IOL on the anterior capsule of lens is convenient, safe and effectual in cases with big rupture of posterior capsule of lens.