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

The invention provides a method and a system for controlling transformer substation level voltages. The method and the system for controlling the transformer substation level voltages have the advantages that district level equipment is controlled, accordingly, terminal voltages of circuits of power distribution networks can be regulated and controlled, and the problem of low terminal voltages of existing circuits of existing power distribution networks can be effectively solved.

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 cylinder type series-connection line direct-current monopole motor; the cylinder type series-connection line direct-current monopole motor comprises a machine shell (1100), astator (1300) and a rotor (1200), wherein the machine shell comprises a cylindrical shell (1100-A) and disc type end covers (1100-B) at the two axial ends of the cylindrical shell (1100-A); the stator (1300 and the rotor (1200) are arranged in the machine shell; the motor is characterized in that the stator comprises an excitation coil fixing body (1301) and annular excitation coils (1302); the rotor (1200) comprises at least one open-loop squirrel-cage armature (1202) and a cylindrical rotor (1201); the annular excitation coils (1302) are arranged on the excitation coil fixing body (1301); at least one open-loop squirrel-cage armature (1202) is arranged on the cylindrical rotor (1201); at least two annular excitation coils are arranged at intervals in the axial direction; the current directions of adjacent annular excitation coils are opposite to form a monopole radial magnetic field; and one open-loop squirrel-cage armature (1202) is correspondingly arranged on the inner side of theeffective excitation edge of each monopole radial magnetic field .

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 discloses a low-voltage compensation device and method for an energy-saving distribution network. The device is divided into rectification part, inverter part and bypass unit; rectification part includes relay QF1, filter capacitor C1, AC reactance L1, IGBT tube G1, rectifier diode, photovoltaic panel; inverter part includes relay QF2, IGBT tube G2 , IGBT tube G3, inverter inductor L2, and filter capacitor C2; the bypass unit includes a bidirectional thyristor SCR; the series voltage compensation method is adopted to solve the low voltage problem of the distribution network, and the device only needs to provide part of the load power; the direct series connection without transformer is adopted The method avoids the loss and non-linear problems of the transformer; combined with photovoltaic power generation, the working mode is switched to solve the problem of too low voltage at the access point when multiple voltage regulating devices are running at the same time, and at the same time make full use of photovoltaic power generation to achieve energy saving and emission reduction. effect.

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 invention relates to a manufacturing method of composite diaphragm paper for a nickel-hydrogen low-self-discharge battery. The manufacturing method comprises the following steps: selecting an anti-dendritic crystal diaphragm of which the aperture is 0.01-100 microns, the pore size is uniform and the thickness is 5-80 microns; performing hydrophilic treatment on the selected anti-dendritic crystal diaphragm by adopting a surfactant treatment method; and bonding, rolling and compounding the anti-dendritic crystal diaphragm and the nickel-hydrogen liquid absorption film which are subjected to hydrophilic treatment by adopting CMC glue to obtain the composite diaphragm paper. The invention has the beneficial effects that the diaphragm subjected to hydrophilic treatment has good air permeability and hydrophilic liquid absorption performance; the internal resistance of the battery is small, the battery is suitable for high-power discharge, and the current consistency is better; the material also has the effect of blocking or inhibiting impurity micro short circuit between the positive electrode and the negative electrode, so that the electrode performance is more stable in storage and circulation, the self discharge between the electrodes is reduced, and the charge retention capability of the battery is improved; the anti-dendritic crystal diaphragm is used for an aqueous solution soaking process for hydrophilic treatment, is simple to operate, low in cost, safe and reliable, and improves the production efficiency.

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 provides a line voltage regulating transformer with a vector conversion function. The voltage regulating transformer includes a vector conversion coil group, a voltage regulating coil and a voltage regulating iron core. The voltage regulating coil is installed on the voltage regulating iron core, and two groups of voltage regulating transformers are installed. The vector conversion coil group includes two coils, which are coaxially wound on two sets of voltage regulating iron cores and outside the voltage regulating coils, so that the two sets of voltage regulating iron cores become vector iron cores at the same time. It is a line voltage regulating transformer installed in the middle of the line using vector phase conversion to solve the problem of low single-phase transmission voltage in rural low-voltage systems. The vector coil and iron core structure are designed to convert the 380-volt, 120-degree The biphase voltage with phase angle is converted into single-phase voltage without phase (vector conversion); the voltage regulating coil structure is designed to automatically increase the voltage of vector conversion online to the voltage range required by the user. It solves the problem of low voltage caused by the end load and wire diameter of the built line.

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.