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

The invention discloses a three-phase low-voltage line voltage-regulating system. The system comprises a three-phase low-voltage line voltage-regulator. The system is characterized in that the three-phase low-voltage line voltage-regulator comprises a molded case circuit breaker, a three-phase voltage-regulating controller, current transformers, AC contactors, a three-phase isolation transformer, AC voltage stabilization modules, a combination switch and a self-healing electric capacitor, wherein the molded case circuit breaker is connected to the current transformers, the current transformers are connected to the three-phase voltage-regulating controller, the AC contactors are connected to the three-phase voltage-regulating controller, the three-phase isolation transformer is connected to the AC contactors, the AC voltage stabilization modules are connected to the three-phase isolation transformer and obtain voltages from the three-phase isolation transformer, the AC contactors are connected to the AC voltage stabilization modules and the AC voltage stabilization modules provide working voltages, the self-healing electric capacitor is connected to the combination switch, and the three-phase voltage-regulating controller will emit instructions to automatically regulate opening and closing of the AC contactors to change the access mode of a three-phase isolation transformer winding so that a secondary side of the three-phase isolation transformer outputs qualified voltages.

The invention discloses a low-voltage treatment method for a rural power grid. In the rural power grid, four-stage regulating and controlling devices are arranged at the low-voltage line from a transformer substation to a supplied user, which sequentially comprise a first-stage on-load voltage regulation and transformer substation concentrated compensation device for regulating and controlling the transformer substation, a second-stage multilevel circuit reactive compensation device for regulating and controlling a medium-voltage line, a third-stage on-load tap changing transformer for regulating and controlling a distribution area, and a fourth-stage low-voltage reactive compensation device for regulating and controlling a low-voltage line, wherein the low-voltage line is connected with a low-voltage monitor; the low-voltage monitor and each-stage regulating and controlling device are connected with a regulating and controlling management main station through the network or wireless communication. In the low-voltage treatment method disclosed by the invention, when the low-voltage monitor detects a certain low-voltage abnormality in the line, the regulating and controlling management main station regulates and controls the device nearest the fault place according to a sequence from the final state to the advanced voltage of the line; the regulated voltage value is transmitted to the regulating and controlling main station; the voltage data are compared with the reference value, and if the voltage data meet the standard, the main station monitors again; or, the line gives out an alarm.

The invention relates to a smart grid energy-saving optimized comprehensive evaluation method. According to the smart grid energy-saving optimized comprehensive evaluation method, two-layer iteration is adopted to solve load flow problems; according to inner-layer iteration, a forward and backward substitution method is adopted to calculate pure radial network load flows composed of branches; and the outer-layer iteration constantly revises injection current at nodes at two ends of each branch so as to realize overall convergence. The smart grid energy-saving optimized comprehensive evaluation method of the invention is advantageous in energy saving effect.

The invention discloses a low-voltage control device applied to a low-voltage distribution network and aiming to keep the obvious effect of series compensation voltage regulation and the continuously adjustable output capacity of parallel compensation and to solve a low-voltage problem. The low-voltage control device comprises a series compensation module and a parallel compensation module which are connected in series with each other between a power supply and a load. The series compensation module comprises a series capacitor bank (C3) and a bypass circuit which are connected in parallel. The series capacitor bank (C3) comprises a plurality of series capacitors connected in parallel. The bypass circuit is a two-stage bypass circuit. The parallel compensation module comprises a plurality of parallel capacitors connected in parallel each of which is connected in series with a combination switch. One end of each parallel capacitor is grounded.

The invention relates to an electric heating load regulation optimization method and device. The method comprises the steps of substituting an obtained load distribution amount of an electric heatingload into a load regulation efficiency optimization model, and obtaining a load regulation efficiency initial value of each electric heating load; based on the load regulation efficiency initial valueof each electric heating load, correcting the load distribution quantity of the electric heating loads input into the load regulation efficiency optimization model in the iterative solution process by utilizing a dual model of the load regulation efficiency optimization model, and determining an optimal load regulation scheme according to the load regulation quantity of each electric heating loadobtained in the iterative solution process. The optimal load regulation and control scheme is obtained by optimizing the load regulation efficiency of the electric heating load, and the problems thatthe voltage at the tail end of the power distribution network is low and the load utilization rate is not high due to increase of the electric heating load are solved.

The invention relates to a composite ternary positive electrode material, a preparation method thereof and a lithium-ion battery. The preparation method of the composite ternary positive electrode material comprises the following steps: 1) uniformly mixing a precursor and a lithium source, and carrying out heat preservation at 500-900 DEG C for 5-20 hours to obtain a pre-sintered product; 2) uniformly mixing the pre-sintered product with an auxiliary agent, and carrying out heat preservation at 700-1000 DEG C for 5-20 hours to obtain a ternary material; and 3) carrying out oxide coating treatment on the ternary material prepared in the step 2) to obtain the composite ternary positive electrode material. According to the preparation method of the composite ternary positive electrode material provided by the invention, the ternary material with a layered structure is formed through low-temperature pre-sintering, so that a lithium source is fixed, and the problem of serious lithium loss caused by high-temperature sintering is reduced; then an auxiliary agent is added for sintering, so that the effects of reducing the sintering temperature and remodeling a crystal are achieved, and theternary material with high voltage and single crystal morphology is prepared; and finally, through oxide coating treatment, the interface stability of the material under high voltage is improved.

The invention discloses a low-voltage compensation device and method of an energy-saving power distribution network. The device is divided into a rectification part, an inversion part and a bypass unit, wherein the rectification part comprises a relay QF1, a filtering capacitor C1, an AC reactor L1, an IGBT tube G1, a rectification diode and a photovoltaic cell panel, the inversion part comprisesa relay QF2, an IGBT tube G2, an IGBT tube G3, an inversion inductor L2 and a filtering capacitor C2, and the bypass unit comprises a bidirectional thyristor SCR. With the adoption of a series voltagecompensation mode, the problem of low voltage of the power distribution network is solved, and the device only needs to provide a part of load power; with the adoption of a transformerless DC seriesmode, the problems of loss and non-linearity of the transformer are prevented; combined with photovoltaic power generation, a working mode is switched, and the problem of extremely low voltage of a plurality of voltage regulation devices simultaneously running at access points is solved; and meanwhile, photovoltaic power generation is fully utilized, the effect of energy saving and emission reduction is achieved.

The invention relates to a chargeable and dischargeable aqueous solution energy storage device. The energy storage device is mainly composed of a magnesium salt aqueous solution containing an organicadditive and an electrode material, wherein the negative electrode is metal magnesium or magnesium alloy; and the positive electrode is a carbon material capable of performing ion reversible adsorption / desorption, oxide capable of producing pseudocapacitance or a conductive polymer capable of generating pseudocapacitance, oxide capable of performing a redox reaction or an intercalation compound capable of performing ion reversible intercalation / deintercalation. The chargeable and dischargeable aqueous solution energy storage device has a high electrochemical stability window, and the energy density can reach more than 260Wh / kg, which is much higher than that of an ordinary aqueous solution energy storage device. The chargeable and dischargeable aqueous solution energy storage device can beused for storage and release of power.

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 discloses a design method of a novel wide-breadth voltage-regulating distribution transformer, and aims to provide a design method of a novel wide-breadth voltage-regulating distributiontransformer which is reliable in operation. The method comprises the following steps: step 1, selecting transformer districts which cannot maintain normal voltage amplitude of a low-voltage side fromthe transformer districts in grid-connected operation, and comparing and analyzing voltage regulation modes and control strategies of the transformer districts to obtain a wide-width voltage regulation distribution transformer meeting requirements; step 2, by researching a control strategy of the wide-width voltage-regulating distribution transformer, adding a corresponding unit on a functional module, thereby realizing self-adaptive control of the distribution transformer and automatic treatment of low voltage; step 3, enabling the wide-width voltage-regulating distribution transformer to have self-adaptive operational capability by designing the wide-width voltage-regulating distribution transformer and optimizing a control strategy; and step 4, screening and optimizing a self-adaptivecontrol module through PSCAD-based simulation modeling and full-working-condition fault analysis, thereby improving the low-voltage governance capability of the low-voltage transformer area in the distribution network.

The invention discloses a double-bus power supply system and a control method. The double-bus power supply system comprises a first load. The first bidirectional silicon controlled rectifier SCR1, thesecond bidirectional silicon controlled rectifier SCR2, the third bidirectional silicon controlled rectifier SCR3, the first change-over switch K1 and the second change-over switch K2 are respectively connected with the control unit. The first bus L1 and the second bus L2 are respectively connected with a first load and a second load through the third bus L3, and the first bus L1 and the second bus L2 are connected through the third bidirectional silicon controlled rectifier SCR3. The first change-over switch K1 and the second change-over switch K2 are respectively connected with the third bus L3. According to the double-bus power supply system, the SCR1, the SCR2 and the SCR3 are adopted to replace a traditional isolation circuit breaker, and the control unit is arranged, so that a loadtransient interruption event caused in the switching process of the double-bus power supply system can be avoided, and the switching stability and the switching efficiency are improved.

The invention aims at providing a modularized intelligent reactive compensator. A reactive compensation mode of intelligent control is achieved through an intelligent integrated capacitor composed ofa power grid parameter sampler, an intelligent network, an intelligent controller, a zero-off switching device, a power capacitor, a circuit protector and other units, and the problem of low voltage caused by insufficient reactive power of a large power distribution network is effectively solved. The modularized intelligent reactive compensator mainly comprises modular design of the intelligent integrated capacitor, study on the intelligent controller as a control core of the intelligent integrated capacitor, the improvement in the zero-off switching device and technical support of intelligentnetwork communication. According to the modularized intelligent reactive compensator, the defect of a traditional compensation device is greatly overcome, and the prominent advantages of zero-off switching, intelligent networks, split-phase compensation, temperature protection, man-machine interfaces, easy wiring, convenient capacity increasing, high reliability, low power consumption and the like are achieved.

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.

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 discloses a dynamic overload on-load wide-amplitude pressure regulating distribution transformer. The dynamic overload on-load wide-amplitude pressure regulating distribution transformer comprises a low-voltage paper tube, a high-voltage paper tube and an outer shell; two low-voltage coils arranged between the low-voltage paper tube and the high-voltage paper tube, and a low-voltage oil way is formed between the two low-voltage coils; an oil way between the high voltage and the low voltage is arranged between the low-voltage paper tube and the high-voltage paper tube; the high-voltage paper tube is adjacent to a first high-voltage coil, a first high voltage oil way is arranged between the first high-voltage coil and a second high-voltage coil, and a second high voltage oil way is arranged between the second high-voltage coil and a third high-voltage coil; a corrugation cooling fin is arranged in an oil tank of the transformer, an upper oil way opening and a lower oil way opening are formed in the corrugation cooling fin, and oil circulates between the upper oil way opening and the lower oil way opening. The dynamic overload on-load wide-amplitude pressure regulating distribution transformer can solve the problem that in the prior art, the distribution transformer often operates in the light load state or the unloaded state and at low voltage, and has the advantages that the good radiating effect is achieved, and the power distribution reliability is improved.

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 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 discloses a rural intelligent low-voltage power distribution network low-voltage treatment device and a use method thereof. The technical scheme is that the device comprises a power grid equipment body; a voltage dividing mechanism is arranged at the bottom of the power grid equipment body and comprises a reactive power compensation equipment body, and supporting pieces are rotationally connected to the two sides of the power grid equipment body through bearings; a first sliding groove is formed in the bottom of the supporting piece, a connecting plate is arranged in the first sliding groove, limiting blocks are fixedly connected to the two sides of the connecting plate, the limiting blocks are arranged in the first sliding groove, a fixing sleeve is fixedly connected to the bottom of the connecting plate, a bearing plate is arranged in the fixing sleeve, and the bearing plate is movably connected with the fixing sleeve in a sleeving mode; and the reactive compensation equipment body is arranged at the top of the bearing plate; the beneficial effects of the invention are that the problems of insufficient horsepower and low voltage, easy influence on the working power and efficiency of equipment and damage to the equipment due to overlarge current load during power utilization in peak hours are solved.

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 invention discloses a rural distribution network low-voltage improvement device. The rural distribution network low-voltage improvement device comprises a single-phase EN series controller, a lineprotection unit and a capacitor which are electrically connected, a thyristor composite switch circuit, a molded case circuit breaker, a lightning arrester and a current transformer, wherein the controller adopts feedback monitoring, the real-time voltage of a load is used as a switching physical quantity, and signal data collection, calculation and control output are completed in 20ms, and aftera switching switch receives a switching command, zero-current input is completed within 10ms. There is no inrush current in switching, there is not impact on the power grid to ensure the real-time tracking of switching. The device is short in response time, good in voltage improving effect and high in compensation precision, and finally achieves the purposes of the stable tail end voltage of thesystem and the increased voltage pass rate.

The invention provides a cable voltage drop compensation circuit and an ultrasonic imaging system. The cable voltage drop compensation circuit comprises a voltage stabilization module, a sampling conversion module, a cable which is used for connecting a load, and a sampling resistor which is connected between the voltage stabilization module and the cable. The voltage stabilization module is configured to output a current and a first voltage to the sampling resistor. The sampling conversion module is configured to collect a second voltage generated at the two ends of the sampling resistor when the current passes through the sampling resistor, convert the second voltage into a third voltage according to a set rule, and output the third voltage to the voltage stabilization module. The voltage stabilization module is configured to adjust the first voltage according to the third voltage so as to compensate the voltage drop generated by the current on the cable.

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 transformation function. The voltage regulating transformer comprises a vector transformation coil set, voltage regulating coils and voltage regulating iron cores. The voltage regulating coils are installed on the voltage regulating iron cores, and the two sets of voltage regulating coils and voltage regulating iron cores are installed on each voltage regulating transformer. The vector transformation coil set comprises two coils, and the two coils are coaxially wound outside the two sets of voltage regulating coils andvoltage regulating iron cores, so that the two sets of voltage regulating coils become vector iron cores simultaneously. The line voltage regulating transformer is installed in the middle section of aline, conducts transformation through a vector phase and is used for solving the problem that a country low-voltage system single-phase transmission voltage is low; the vector coils and an iron corestructure are designed, and a double-phase voltage of 380 V and with a phase angle of 120 degrees free of zero lines is transformed into a phase-free single-phase voltage (vector transformation); a voltage regulating coil structure is designed, and the voltage subjected to the vector transformation is automatically raised to the voltage range needed by a user on line. The low voltage problem, caused by the problems of a tail end load and the line diameter, of an already built line is solved.

The invention relates to a low-voltage intelligent station area line voltage automatic adjusting method. An isolation transformer, an intelligent gear controller, an intelligent circuit breaker, an intelligent fusion terminal and the like are included. Two phases of circuits in the low-voltage distribution transformer are connected in series through the isolation transformer and are used in a voltage reduction mode. The high-low voltage turn ratio of the isolation transformer is adjusted in a self-adaptive mode through the intelligent gear controller and the intelligent fusion terminal, intelligent adjustment of the electricity utilization voltage of a terminal user is achieved, and meanwhile real-time monitoring of the voltage of a transformer area line is achieved in combination with a new-generation power distribution cloud master station. The method solves the problem of low voltage ubiquitous to users at the tail end of the low-voltage distribution area, and has the advantages of no harmonic interference, high efficiency, strong loading capacity, economy and the like.

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.