48results about How to "Increase terminal voltage" patented technology

An electric load driving circuit for driving an electric load having a capacity component includes a plurality of power sources generating different voltages, capacitors provided parallel to the plurality of power sources, a switch control unit that switches connections between the capacitors and the electric load and thereby switching a voltage applied to the electric load, discharge paths that enable discharging electric charge stored in the capacitor, and a discharge control unit that controls a quantity of electric charge discharged from the discharge paths.

The invention discloses a reactive collaborative compensation system and method of a power distribution network low voltage circuit. A concentrate compensation unit and a disperse compensation unit are arranged and organically combined, and intelligent collaborative compensation of reactive power of a power transmission circuit and a distribution transformer on a low voltage side is realized under the condition that the system overall investment cost is low. The reactive collaborative compensation system and method of the power distribution network low voltage circuit can reduce the loss of the circuit, and is particularly suitable for reactive power compensation of a rural power grid and a distribution circuit adopting a public transformer, the power factor of the whole power distribution system is improved, the tail end voltage of a power supply circuit is improved, and the safety, economic and efficient operating level of a power grid is improved.

The invention relates to a capacitor optimization configuration method based on an improved particle swarm optimization. The method comprises the following steps of S1, establishing a target functionwith improved voltage quality; S2, establishing a target function with reactive compensation reaching the standard; S3, establishing a target function with the total harmonic distortion rate reachingthe standard; S4, establishing a target function of parallel resonance frequency and series resonance frequency; and S5, establishing a multi-objective optimization model, and carrying out optimizingand configuring on the capacitor by adopting a particle swarm algorithm. Under the condition that resonance and voltage fluctuation are considered, the improved particle swarm algorithm is adopted, the inertia coefficient of the system is controlled by means of the method of presenting the linear descent along with the number of iterations, so that the algorithm can have high global searching performance when starting, the vicinity of the global optimum region can be quickly located, and meanwhile, high local searching performance is achieved; the established optimization model is not only applicable to electric power companies, the capacitor optimization configuration method based on an improved particle swarm optimization and other levels of power transmission and distribution managementdepartments, and is also suitable for a large-scale steel plant, a cement plant and other important harmonic source users.

The invention discloses a direct hanging type large-capacity electric energy quality comprehensive managing device for an electrified railway. The direct hanging type large-capacity electric energy quality comprehensive managing device comprises an active compensation system and a passive compensation system. The passive compensation system comprises two passive high-pass filters for filtering higher harmonics out and providing partial capacitive reactive power, and the active compensation system is formed by connecting a plurality of active compensation units in parallel. The direct hanging type large-capacity electric energy quality comprehensive managing device has the advantages of being simple in structure, low in cost, good in reliability, capable of solving various electric energy quality problems and the like.

An electric motor control apparatus controls an electric motor system that includes a power converter including switching elements and a three-phase alternating-current motor. The electric motor control apparatus includes generating devices for generating modulation signals by respectively adding corresponding triple harmonic signals to phase voltage command signals and a control device for controlling switching elements on the basis of a magnitude relation between each of the modulation signals and a carrier signal. Each of the triple harmonic signals includes a signal component that increases the absolute value of a peak value of a signal level of the corresponding modulation signal above the absolute value of a peak value of a signal level of the carrier signal in a corresponding one of phases.

The invention discloses an automatic rural network low-voltage in situ reactive compensation adjustment method. Capacity increasing is conducted on a transformer, the transformer is additionally arranged, low-voltage network distribution is conducted, a voltage regulating network is installed, a variable-phase transformer is installed, a distribution transform low-voltage-side automatic switching reactive compensation device and a low-voltage line reactive compensation device are additionally arranged, a in-situ compensator device is installed for a large-power user, and a voltage boosting device is additionally arranged at the branch line tail end. The voltage boosting device comprises a three-phase unbalanced adjustment reactive compensation controller, a star connection capacitor and an angle connection capacitor. The output efficiency of the transformer is improved and the power factor of the transformer is increased through connecting the star connection capacitor and the angle connection capacitor into phases and being in combination with the three-phase unbalanced adjustment reactive compensation controller. The method starts from solving three-phase unbalance and reactive compensation, the branch line voltage change is tracked automatically, the reactive power compensation and the active power are controlled to transfer automatically among the phases to achieve balance, the transformer output efficiency is improved, the transformer power factor is increased, reasonable adjustment of the branch line voltage is achieved, the line loss is reduced, and the branch line voltage is effectively boosted.

A solar cell and a method of manufacturing the solar cell, the solar cell including a first surface configured to receive incident sunlight and having a concavo-convex pattern, a substantially flat second surface opposite to the first surface, a first doped layer formed as a crystalline silicon layer having a first dopant, and a second doped layer formed as an amorphous silicon layer having a second dopant. The processes for forming these layers, with the exception of forming the first doped layer, are performed at a low temperature. Accordingly, reflectivity of sunlight may be minimized, a high terminal voltage may be generated, and a wafer including the solar cell can be kept from being bent.

The invention relates to a middle-low speed maglev vehicle running mechanism. The running mechanism comprises levitation frames connected in sequence. A linear induction motor stator is respectively hung on two sides of each levitation frame. The number of the levitation frames is six. The number of the linear induction motor stators is twelve, and the linear induction motor stators are symmetrically distributed on two sides of the running mechanism. The linear induction motor stators on each side of the running mechanism are divided into at least two groups. The linear induction motor statorsin each group are connected in series and are connected with a vehicle-mounted traction invertor. Compared with the prior art, the running mechanism increases terminal voltage of a single linear induction motor stator, and can improve maximum operation speed of a maglev train, and meanwhile system availability and reliability are improved, so as to ensure safe and stable operation of a train.

The present invention belongs to the electric power technical field and relates to a method for promoting wind power low voltage consumption. The method includes the following steps that: the low voltage consumption function model of a doubly fed wind turbine set is built; simulated analysis is performed on influence on the terminal voltage of the doubly fed wind turbine set caused by a short circuit occurs on the external system of a wind power plant according to the low voltage consumption function model; the low voltage limit value requirement of the low voltage consumption capacity of the doubly fed wind turbine set is determined according to a simulation result; and a series dynamic braking resistor is additionally arranged at the low voltage side of a booting transformer at the wind power plant outlet of the doubly fed wind turbine set, so that simulation can be carried out, and therefore, the terminal voltage of the doubly fed wind turbine set can be improved. With the method adopted, the low voltage consumption capacity of the wind power plant can be improved, certain project investment can be saved, and the price of wind power which is transferred onto a power grid can be decreased to a certain extent, and the development of wind power can be promoted.

The invention provides an IGBT (Insulated Gate Bipolar Transistor)-based high-voltage dynamic filtering power-saving device for a mine, comprising an active filter measuring-controlling and driving circuit, a smoothing filter, a main active filter circuit, a signal detecting circuit, a relay protection signal detecting circuit, a passive filter circuit, an active filter boosting transformer and a grid protecting circuit. A huge controllable reactor which absorbs reactive power and consumes active power in an SVC (Static Var Compensator) is replaced with a capacitor device sending reactive power; and a silicon controlled rectifier for generating harmonics is replaced with a novel electronic switch element, i.e., an IGBT of which the electric property is higher than that of a GTR (Giant Transistor). All the elements are arranged in a flameproof box, so that dynamic reactive compensation harmonic treatment equipment can enter underground, and the aims of reducing line loss and increasing the voltage at a tail end are achieved.

The invention relates to an operational amplifier controlled animation display conductivity test instrument, belonging to the demonstration field of teaching instruments. The animation display conductivity test instrument is composed of a test rod, a test clamp, tester jacks, a first-stage amplification unit, a second-stage operational amplification unit, an oscillation unit, a sound unit, a pushing unit, a zeroing unit, a light color display unit, an image effect unit and a quick-break protection adjustable power supply. A power supply for starting quick-break protection during overvoltage is arranged to protect stability of test instrument. When a tested electronic element is inserted into the tester jacks, according to the characteristics of object conductivity, the tested electronic element is amplified by the first-stage amplification unit and then enters an in-phase input end of a comparison amplifier in the second-stage operational amplifier unit, output is generated on the basis of the intensity of input signals, the sound unit is started to emit sound and also the pushing unit is excited to act, the light color display unit generates light display, animation images are formed, and then visual animation display and a voice effect are achieved. The operational amplifier controlled animation display conductivity test instrument is quite interesting, and can arouse the interest of teenagers to increase the love for science.

The invention relates to a high-voltage soft start main circuit, which belongs to the technical field of high-voltage motor soft starting. The input end of a high-voltage starting switch (2) is connected with a high-voltage grid (1), and the output end is connected with a front reactor (4); a reactor (6) is in parallel connection with a forward transistor (7) and a reverse transistor (8); the parallel-connected end of the reactor (6), the forward transistor (7) and the reverse transistor (8) are connected with the front reactor (4) and the other end is connected with a rear reactor (5); and the other end of the rear reactor (5) is connected with a motor (9). By connecting voltage regulating reactors with antiparallel transistors in parallel and serially connecting phase control reactors in the up-down direction, the high-voltage soft start main circuit provided by the invention can overcome the disadvantages of a variable reactor in the prior art, such as high manufacture cost, complex structure, multiple faults, large maintenance cost, and the content of current harmonics is reduced remarkably. The transistor assembly only needs to bear a lower end voltage and regulate a portion of current, so that the voltage regulator has much lower requirement for the through-current capability of the transistor, thereby greatly lowering the cost.

The invention relates to an accumulator non-maintenance electrolyte which belongs to field of lead-acid accumulator. The accumulator non-maintenance electrolyte comprises by volume percent: 0.1-0.3 of magnesium carbonate, 3-5 of rosin powder, 0.2-0.3 of humic acid, 0.3-0.4 of potassium permanganate, 2-3 of protanetrione, and the balance of dilute sulfuric acid with specific gravity of 1.27. Advantages of the accumulator non-maintenance electrolyte are that: generation of sulfated pole plate and abscission of pole plate active material are avoided, transition of complex particles are generated, evacuation is magnified, liquid surface tension and adhesive force is increased, reaction speed of ions is quickened, terminal voltage and starting current of accumulator are increased, the electrolyte is not easy to ice in winter and volatilize in summer, quality and purity of electrolyte are greatly increased.

In pore diameter distribution curves of a first stack body formed by stacking a first gas diffusion layer and a first porous layer of an anode, and of a second stack body formed by stacking a second gas diffusion layer and a second porous layer of a cathode, on a region where a pore diameter is smaller than a reference pore diameter at which a pore volume is maximum, both the curves coincide with each other for the most part. On a region where the pore diameter is equal to or larger than the reference pore diameter, the distribution curve of the second stack body lies above that of the first stack body. A pore volume ratio which is a ratio of the total pore volume of the second stack body to the total pore volume of the first stack body is in the range of 1.10 to 1.60.

The invention provides a BSG motor start stop control method and system; the method comprises the following steps: a vehicle controller receives a vehicle startup signal, and obtains a terminal voltage of a first battery and a terminal voltage of a BSG motor; if the voltage difference value between the terminal voltage of the first battery and the terminal voltage of the BSG motor is greater thana first set value, the vehicle controller controls a DCDC controller to invert and boost the voltage outputted by a second battery, thus increasing the terminal voltage of the BSG motor, and limitinga terminal current to be smaller than a startup current threshold; if the voltage difference value is smaller than a second set value, the vehicle controller controls a high voltage contactor to close, thus enabling the first battery to power up the BSG motor via the high voltage contactor, wherein the second set value is smaller than the first set value; the vehicle controller sends a motor startup signal to the BSG motor, the BSG motor starts up, and drives the vehicle engine to rotate via a belt. The method and system can improve the vehicle safety.

The invention discloses a remote meter reading device applied to reactive field compensation of an agricultural irrigation motor-pumped well and a system of the remote meter reading device and relates to the technical field of devices for metering and reactively compensating electric energy. The remote meter reading device comprises an intelligent prepayment electric energy meter, a compensation capacitor switching on-off switch, a compensation capacitor, a carrier communication module, an electric leakage protector and a relay. The device is capable of achieving reactive field compensation of the agricultural irrigation motor-pumped well submersible pump and remotely reading information of the electric energy meter of the agricultural irrigation motor-pumped well submersible pump, and is stable to run and convenient to use, and line loss is reduced.

The invention relates to a fault processing method for a power distribution network connected with the ground through a small resistor of an oil field. The fault processing method comprises the steps of seeking a position of a fault point when a fault occurs in the power distribution network of the oil field; disconnecting a circuit of the fault point by opening a circuit breaker, and judging whether the fault is a non-permanent fault or not; closing the opened circuit breaker when the fault is a non-permanent fault, and starting oil pumping unit set in a circuit disconnected with a bus in batches; and otherwise starting a power generator of the oil pumping set adjacent to the opened circuit breaker on the circuit disconnected with the bus, and providing an active power for the circuit disconnected with the bus. After the circuit fault is detected, corresponding fault processing is performed according to a type of the fault, so that normal working of the oil pumping unit set can be guaranteed.

The invention belongs to the technical field of new energy power generation and power supply, in particular to a black start device and a control method of a wind-solar power supply microgrid. As thatphotovoltaic power and the wind power are selected for the black start device and the voltage source energy storage inverter, so that the black start device of the microgrid can operate normally, A DC regulate protection circuit is controlled to gate a black start power supply path by a black start power supply control circuit, the terminal voltage of the battery string is increased by the photovoltaic power and the wind power, and generates a control command according to the electric parameters collected by the electric parameters real-time monitoring circuit, As that voltage source energy storage invert has the starting operate voltage and the corresponding electric power, the natural conditions of solar power generation and wind power can be quickly and conveniently utilized under thecondition that the microgrid does not have the necessary electric power for starting the operation, the black start of the microgrid can be automatically completed, and the technical problem of the black start of the microgrid is effectively and well solved. The voltage source energy storage inverter has the starting operating voltage and the corresponding electric power.