2,814 research outputs found
URBANIZATION AND SUSTAINABLE FOOD PRODUCTION IN CHINA
China is now facing urbanization and the migrants from rural area have increased significantly. The farmland was the core iuess of the new urbanization process. The contracted land management right, residence land use rights and collective construction land allocation right were the main contents of the property right of peasants. To establish a new mechanism to make peasants and the rural collective enjoy the reasonable land profit is important for the new round land reform in China. Based on that, this paper will explain how the rural land were transformed into urban poverty. This paper argued that replace rural retained land into urban property model was a new form of compensation for the rural land. By this model, the migrant farmers can obtain the compensation as the economic base in city and improve the willingness of farmers moving to city and transfer their land to enlarge average arable land scale to develop food production. The paper concluded that the way to solve the shortage of arable land was to speed up the process of urbanization, promote the circulation of cultivated land to realize the expansion of rural per capita arable land to ensure food security. Therefore, it is needed to build a unified construction land market, realize the same price and same right between state-owned land and rural collective land, giving farmers more property rights
Optimized Hierarchical Power Oscillations Control for Distributed Generation Under Unbalanced Conditions
Control structures have critical influences on converter-interfaced
distributed generations (DG) under unbalanced conditions. Most of previous
works focus on suppressing active power oscillations and ripples of DC bus
voltage. In this paper, the relationship between amplitudes of the active power
oscillations and the reactive power oscillations are firstly deduced and the
hierarchical control of DG is proposed to reduce power oscillations. The
hierarchical control consists of primary and secondary levels. Current
references are generated in primary control level and the active power
oscillations can be suppressed by a dual current controller. Secondary control
reduces the active power and reactive power oscillations simultaneously by
optimal model aiming for minimum amplitudes of oscillations. Simulation results
show that the proposed secondary control with less injecting negative-sequence
current than traditional control methods can effectively limit both active
power and reactive power oscillations.Comment: Accepted by Applied Energ
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