55results about How to "Improve voltage distribution" patented technology

The invention discloses a multi-end flexible direct current power transmission system level coordinate control device which comprises a data collecting module, a data processing module, a control function processing module, a communication management module and a redundancy control module. The data collecting module is responsible for process data collection and data collection of analog quantities such as state signals, voltage and current and generates input data needed by the control function processing module. The control function processing module comprises an active control module, a reactive control module, a direct-current voltage control module, a VF control module and the like, finally, reference value signals of voltage, active power, reactive power, frequency and the like of a converter station are generated, the reference value signals are sent to a converter station unit controller through the communication management module to complete a system control target. The multi-end flexible direct current power transmission system level coordinate control device can conduct emergent operation control which includes conversion of the system operation mode and the control mode, emergent running stopping and locking control under some faults, fault switching of a redundant system, resetting operation control after alarming or protecting actions and the like, and the reliability of integrated design of the system is improved.

The invention relates to a double-layer voltage optimization method for integrating low-speed distributed wind power into distribution network, comprising the following steps: 1) constructing a double-layer voltage optimization model according to a model of a low-speed wind turbine generator system and a SVC; 2) In the upper layer model, the multi-objective programming problem of low-speed wind turbine location is solved, and the optimal type and location of low-speed wind turbine are obtained. After the location of low-speed wind turbine is selected, Q-V-curve method is adopted to determine the optimal access location of SVC; 3) The optimal type, access position and optimal access position of SVC of low-speed wind turbine in the upper layer model are transferred to the lower layer model,and the reactive power control method of coordinated voltage regulation between DFIG and SVC based on fuzzy logic is established, so that the parallel voltage of wind turbine can be raised to the range of continuous operation. Compared with the prior art, the invention has the advantages of considering low wind speed, load fluctuation and user behavior characteristics of the load of the distribution network, improving the overall voltage distribution of the distribution network and the like.

The invention provides a voltage bilevel optimization droop control method for a distributed photovoltaic cluster, which belongs to the technical field of power system operation and control. The method includes steps of: establishing a distributed photovoltaic cluster droop curve optimization layer and a distributed photovoltaic local reactive power control layer respectively, two levels executingsimultaneously and separately, and the distributed photovoltaic cluster droop curve optimization layer periodically sending the optimization result to the distributed photovoltaic local reactive power control layer to enable the latter to adjust the reactive power output in real time according to the fluctuation of the system state, respond to the system's reactive power regulation requirements to the greatest extent, solve the contradiction between optimization calculation, cycle communication and real-time control, and reduce the photovoltaic off-net risk. The method fully utilizes the reactive power adjustment capability of distributed photovoltaic power generation nodes, reduces the calculation burden of the system, and reduces the operation and maintenance cost.