3results about How to "Guaranteed voltage quality" patented technology

The application discloses a power distribution network distributed photovoltaic voltage control method and system, comprising the following steps: obtaining the access node, access amount and active and reactive power control strategy of the photovoltaic inverter corresponding to the access node of the distributed photovoltaic in the power distribution network; calculating the sensitivity of the active and reactive power injected by all access nodes, and sorting the sensitivity of the access nodes in descending order; monitoring the voltage amplitude information of each access node during operation, and judging whether the operating voltage of any node is out of limit; when the voltage of any access node is out of limit, selecting the active or reactive control point with the highest sensitivity and positive value in the access node, combining the current meteorological environmental conditions of the selected control point and the corresponding active and reactive power control strategy of the photovoltaic inverter, and calculating the control adjustment amount of the selected control point. The active and reactive adjustment capabilities of different distributed photovoltaic power generation units in the power distribution network can be reasonably controlled, the voltage out-of-limit condition can be effectively improved, and the transmission loss of the power distribution network is reduced.

This invention belongs to the field of voltage level control technology, specifically relating to a reactive power voltage level control method and device based on optimal control objectives. The steps include: acquiring actual data during the reactive power voltage control process; analyzing the correlation between voltage influence factors, reactive power control modes, and reactive power configuration, forming judgment indicators from a quantitative perspective, and completing reactive power voltage leveling; considering the operating cost of reactive power voltage control, the number of switching operations of capacitor banks and on-load tap-changing transformers, and line active power transmission losses, establishing a reactive power voltage optimization model based on optimal control objectives; dynamically adjusting the sub-objective weights of the reactive power voltage optimization model using game theory weighting according to the reactive power voltage leveling situation; and solving the reactive power voltage optimization model using the NSGA-II algorithm within a set time period to obtain the optimal solution of the reactive power voltage level control method based on optimal control objectives. This invention can achieve multi-level reactive power voltage control, stabilizing the voltage within a safe range.

The present application relates to the technical field of electrical control, and particularly relates to a load prediction-based intelligent tap-changer method and system for distribution transformer without power interruption. Multi-source operation data of the load voltage regulating unit of the distribution transformer is loaded first to accurately evaluate the remaining life thereof; then the voltage qualified dead zone width and the double-target optimization function weight coefficient are dynamically set according to the remaining life, and the minimum action interval for tap-changer is configured in combination with the historical action frequency; when the voltage is out of limit, the tap position instruction is generated through double-target optimization, and the tap-changer is executed according to the instruction and the interval and the action information is updated, so that the dynamic balance between the voltage quality and the switch life is realized, and the frequent tap-changer is inhibited. The dynamic balance between the voltage quality guarantee and the load tap changer life protection in the process of tap-changer without power interruption for the distribution transformer can be realized.