3results about How to "Does not affect dynamic performance" patented technology

The invention discloses a configuration method and system for a network-constructing type energy storage system for suppressing broadband oscillation, and relates to the technical field of new energy power generation grid connection and power system stability control. The invention aims to solve the problems that broadband oscillation is easily caused when a new energy field station is connected into a weak power grid, an existing suppression method affects equipment characteristics or needs additional investment, and netting type energy storage locating and sizing lacks scientific guidance. The method comprises the following steps: firstly, simplifying a system comprising a new energy station, a constructed network type energy storage system and a power grid, then carrying out impedance modeling on the two systems (reserving complete impedance characteristics of energy storage), and judging the stability through an impedance analysis method; and the optimal capacity is determined at a single position, and then the global optimal capacity and the corresponding position are determined by traversing the positions, so that low-cost broadband oscillation suppression is realized.

The application provides a direct-drive wind turbine active damping control method suitable for extremely weak power grids, comprising: a first oscillation stability improvement control strategy of a grid-side converter of a direct-drive wind turbine, and a second oscillation stability improvement control strategy of a machine-side converter; the first oscillation stability improvement control strategy is to apply d-axis and q-axis current components to corresponding voltage channels after damping compensation through the combination of a high-pass filter and a virtual impedance link; meanwhile, the q-axis current components are cross-compensated to the d-axis voltage channel after passing through a band-stop filter and a virtual impedance link; the second oscillation stability improvement control strategy is to apply d-axis and q-axis current components to corresponding voltage channels after damping compensation through the combination of a band-stop filter and a virtual impedance link. Through the grid-side converter control strategy and the machine-side converter control strategy, the oscillation stability of the direct-drive wind turbine is improved under the condition of extremely weak power grids, and the dynamic performance is not affected.

This invention relates to a method for purifying water from deep, water-rich tunnels using a construction inclined shaft. The method includes the following steps: preliminary purification of the tunnel surface at the support face, including preliminary purification of the tunnel surface along the slope and against the slope; the installation of multi-stage sedimentation tanks within the main tunnel; the installation of water storage tanks and pumping stations; and further purification of tunnel wastewater in an external sedimentation tank. This method effectively removes tunnel construction wastewater through a preliminary purification system on the surface and through internal and external sedimentation and purification systems, ensuring a good construction environment. It has the advantages of being simple and practical, having good drainage and filtration effects, low pollution control costs, and enabling on-site recycling and reuse of wastewater with good overall performance.