The induction motor is multi-variable, nonlinear and strong-coupled system. Due to parameters' variation during operation of induction motor, the decoupling and linearization implemented by field oriented control(FOC) and analytical inverse control(ANIC) is destroyed. For that, a novel linearization and decoupling method named as artificial neural network(ANN) inverse for induction motor control is proposed. It is characterized by that the construction of the ANN inverse is independent of the motor model and parameters. Cascading the ANN inverse which consists of a static ANN and four integrators with the motor, the multivariable, nonlinear and strongly coupled system is decoupled into two independent second-order linear subsystems, or rotor speed subsystem and rotor flux one, so as to be easy to design the closed-loop linear regulator to control each of the subsystems. Simulation and primary experiment results show that the good static and dynamic decoupling performance and the strong robustness to both variation of parameters and load torque disturbance can be achieved by using the proposed method.
This article aims to discuss how to give full play to the comparative advantages of the rural ecological environment and realize the endogenous development of rural society and economy in China. First, based on the ecological economy theory of “lucid waters and lush mountains are golden and silver mountains” (the “two mountains” theory), we integrated the theories and methods of ecology, economics, and geography disciplines to examine the transformation of “ecological advantages” into “economic development” from a comprehensive perspective. Second, based on the matching relationship between the division of major function zones and the classification of ecological services, we creatively constructed a theoretical framework for the endogenous development of rural areas. Third, accounting indicators and methods for rural ecological products’ biophysical quantity and monetary value are established. Finally, we conducted an empirical study of Nanshi Village in central China as a case. The results showed that: The benefits provided by ecosystems to the development of human society would be underestimated if it is measured only by the provisioning services; the per capita Gross Ecosystem Product (GEP) of the case area was three times the per capita disposable income of rural permanent residents in the same period. Taking advantage of the rural ecological environment to promote the actual transformation of the potential value of ecological products is the feasible path for rural revitalization. One of the implications of this study is that it links the rural ecological and environmental advantages with social and economic development from the perspective of ecological economics and provides decision-making support for this case and other similar rural ecological industry revitalization practices.
In some industry instrument and automation equipment, the digital signal processor (DSP) usually needs establishing the interface with different speed peripheral chips. TMS320Cxx provide two kinds of mechanism to match with out side chips. One can insert 0~7 wait periods by setting inner control register. Another is to provide the READY signal pin, it can produce arbitrarily number of wait period with the exterior control circuit. In this paper, CPLD is employed to generate the waiting sign by the correlative hardware circuit diagram and VHDL language programs method respectively. The speed match circuits have been realized between DSP and peripheral chips. It can simplify the program and raise the whole performance speed of system.
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