34results about How to "Solve low voltage" patented technology

The invention relates to a low-voltage management method for coordinated control of a transformer tap switch and a distributed power supply, and belongs to the technical field of low-voltage governance. According to the invention, the management of the low voltage of the power distribution network is realized by a method of combining voltage control of a transformer substation and reactive power and active power control of the distributed power supply. Firstly, rough adjustment of low voltage of a power grid is realized by changing the position of a tap switch of a main transformer; furthermore, the voltage of the line is locally adjusted by changing the active power and the reactive power of the distributed power supply in the line, so that the voltage of the power distribution network isaccurately adjusted, and the effect of balancing the voltage of the whole line is achieved; and finally, the state of the distributed power supply is adjusted through recovery control, the active power and reactive power of the distributed power supply are optimized, and the influence of voltage regulation control on the power generation efficiency of the distributed power supply is reduced to the maximum extent. According to the invention, the problem of low voltage of the power distribution network is solved, the distributed power supply is fully utilized, and the cost of low voltage management of the power distribution network is reduced.

The invention discloses a rural distribution network low voltage treatment method, comprising the steps of obtaining a load voltage of a load node; judging whether the node voltage is smaller than a preset threshold or not; determining a voltage adjustment parameter of a voltage adjustment device according to the load voltage if the node voltage is smaller than the preset threshold; and sending the voltage adjustment parameter to a voltage adjustment device, thereby enabling the voltage adjustment device to adjust the load voltage according to the voltage adjustment parameter, wherein the voltage adjustment device comprises a feeder line reactive compensation device, and the voltage adjustment parameter of the feeder line reactive compensation device is feeder line reactive compensation quantity. According to the method and the system, through monitoring and analysis of the load voltage of the load node, the adjustment can be carried out by controlling the voltage adjustment parameterof the voltage adjustment device when the low voltage condition occurs; through utilization of the advantage that the feeder line reactive compensation device is close to the load node, the low voltage problem of the load node is effectively solved; and the treatment effect is improved. The invention also provides a rural distribution network low voltage treatment system. The system has the same beneficial effects.

The invention discloses a distribution transformer capable of automatically adjusting capacitance and voltage. The distribution transformer comprises a transformer shell; transformer coils are arranged in the shell; the upper and lower ends of the transformer coils are provided with an upper clamp piece and a lower clamp piece; the shell is provided with a transformer top cover; the upper part ofthe transformer top cover is provided with high voltage insulators and low voltage outlet parts or low voltage insulators; and the distribution transformer also comprises a transformer support, a capacitance adjustment switch, a voltage adjustment switch, a low voltage permanent magnet vacuum load switch and a comprehensive monitoring controller. The distribution transformer capable of automatically adjusting capacitance and voltage effectively solves the problems of low voltage in a distribution network, large no-load loss and unbalanced transformation three-phase load in a rural power distribution transformer district, can be operated remotely in a controllable way, has a function of power stealing prevention, and realizes automatic control and power monitoring and management of the power distribution network transformer district.

The invention relates to a load moment margin-based medium-voltage feeder breaking position optimization method. The method comprises the steps of simplifying a network frame topology structure into a single radiation topology type that all loads are intensively distributed and mounted on a trunk line; formulating breakpoint alternative schemes by combining planed substation locations and a feeder network topology; selecting the model number of the line with the maximum line diameter in the trunk line as the feeder baseline type, calculating feeder load moment values at two sides in the most serious working condition under various schemes respectively and comparing the load moment values with a load moment threshold under a power factor corresponding to the baseline type to obtain the total load moment margin after the corresponding scheme is implemented; and finally, selecting the scheme with the maximum total load moment margin as a recommended breakpoint according to the comparison result of the total load moment margins of the alternative schemes. According to the load moment margin-based medium-voltage feeder breaking position optimization method, a distribution network designer conveniently looks for an optimal breaking scheme by combining the network frame topology and the load space distribution condition; an enough growth margin is reserved for development of each regional load when the problem of low voltage at the tail end of the line is solved; and resource waste caused by repeated construction in the near future is avoided.

The present invention provides a court-level voltage control method and system. The method realizes the regulation of the control of the voltage of the tail end of distribution line through the control of the court-level device so as to effectively solve the problem that the voltage of the tail end of the distribution line is low.

The invention is suitable for a low-voltage management device and method at the end of a long-distance 10kV distribution network, and relates to the technical field of distribution network power management devices. The invention includes an active compensation unit, a passive compensation unit, and a control unit. The active compensation unit and the passive compensation unit are connected in series to the end of the 10kV power distribution line, and the active compensation unit is set at the front end of the passive compensation unit and located at the power distribution line. line power side. Aiming at the deficiencies of existing low-voltage treatment devices, the invention achieves the goals of simple structure, increased power density, reduced capacity requirements of compensation devices, and improved equipment cost performance.

The invention discloses a wide-area reactive power control low-voltage treatment method, which comprises the steps of: constructing a wide-area reactive power control low-voltage treatment model; adding a constraint condition on a voltage amplitude safety lower limit of a voltage infeasible node into the wide-area reactive power control low-voltage treatment model; and regarding the minimum voltage lower limit crossing amount and the lowest power loss of the voltage infeasible node as a target function, and calculating the wide-area reactive power control low-voltage treatment model by utilizing a parallel co-evolutionary algorithm to obtain the optimal voltage control scheme. The wide-area reactive power control low-voltage treatment method effectively solves the problem that the wide-area reactive power control of a power distribution network fails at the voltage infeasible node, and achieves the purpose of effectively treating the low-voltage problem in the power distribution network.