349results about How to "Reduce running loss" patented technology

A high-voltage direct-current breaker is composed of an initial current path (1) and a fail current interdicting path (2). The initial current path (1) comprises at least one electric electronic switch module (3) and a mechanical switch (4), and the fail current interdicting path (2) comprises an initial capacitor (C) and a modular switching subunit series connection component (5). The modular switching subunit series connection component (5) is formed by connecting a plurality of sub units (6) in series. When a high-voltage direct-current electric transmission line fails, the opening and closing of a fail electric transmission line can be rapidly achieved.

The invention relates to a unified power flow controller based on a modular multilevel converter structure. The unified power flow controller comprises a static synchronous compensator and a static synchronous series compensator, wherein positive and negative buses of the static synchronous compensator are connected with positive and negative buses of the static synchronous series compensator; and an output end of the static synchronous compensator and an output end of the static synchronous series compensator are respectively connected with a power grid. According to the invention, as a modular-mode cascaded form is adopted, the requirements on components are reduced; a modular design is realized, the integrated level is high, and the design is convenient; through a design on a bridge arm, an effect of individual-phase control is achieved; through using a redundancy technique, a fault unit can be bypassed, thereby improving the operation reliability of a device; in an original technique, for reducing the outputting of harmonic waves, a scheme of connecting IGBT (insulated gate bipolar translator) devices in series is usually high in switching frequency, therefore, the loss of the device is large; in the invention, a modular multilevel technique is adopted, so that the switching frequency of each component is low, but an effect of extremely high external equivalent switching frequency can be achieved, and the outputting of harmonic waves is reduced, therefore, the device is low in running loss.

The invention provides a high-speed railway electric energy quality and traction network voltage comprehensive compensation system. The comprehensive compensation system comprises a single-phase back-to-back STATCOM installed on the traction side of a traction substation and thyristor switched high-pass filters installed in section posts. The single-phase back-to-back STATCOM is used for negative sequence compensation, lower-order harmonic filtration within the range of 2-11 order and power factor and traction network bus voltage control. The thyristor switched high-pass filters are used for absorbing high-order harmonic with the order of 11 or above and stabilizing the traction network terminal voltage. The single-phase back-to-back STATCOM can detect the power factor of the traction substation in real time, carry out dynamic stepless regulation on reactive output and maintain the power factor of the system to be 0.9 or above. The thyristor switched high-pass filters arranged in the section posts are used for absorbing harmonic currents with the order of 11 or above and improving the traction network voltage. The whole high-speed railway electric energy quality and traction network voltage comprehensive compensation system has the advantages of being small in occupies area, low in operation loss, low in construction cost, high in reliability, simple in technology implementation, prominent in comprehensive benefit and the like.

The invention belongs to an operating method for an olefin conversion device and relates to a device for preparing olefin such as methanol to olefin (MTO) and methanol to propylene (MTP) by using organic oxides such as methanol, dimethyl ether and the like. The method is characterized by comprising the following steps that: when the device is operated, catalysts of a reactor 2 and a regenerator 3are respectively introduced from respective catalyst tank and are added in two paths; and the catalysts respectively added into the reactor and the regenerator are heated depending on an external heat source and a heating medium which are independently arranged, namely, the reactor 2 is provided with an operating steam superheater 1 to heat the catalyst by using high-temperature steam and the regenerator 3 is provided with an auxiliary combustor to heat the catalyst by using high-temperature air. When added, the catalysts are not transferred from the regenerator 3 to the reactor 2, namely thecatalysts are not transferred between the reactor and the regenerator.

A fault current limiter (FCL) for limiting a fault current in a power line during a fault condition. The FCL includes a magnetic coupling circuit for monitoring current in the power line through magnetic coupling; a sensing circuit for sensing the current in the power line and providing a signal indicative of the sensed current; a control circuit receiving the signal indicative of the sensed current in the power line and determining whether the sensed current indicates that the fault condition exists; and high and low impedance paths that are connected in parallel. The high impedance path includes a discharging impedance circuit for limiting the fault current. The low impedance path includes a reactor circuit and a switching unit having an ON state for conducting current through the low impedance path and an OFF state for conducting current through the high impedance path.

The invention provides an HVDC (high voltage direct current controller) and UPFC (unified power flow controller) system based on a modularized multi-level converter. The HVDC and UPFC system comprises converting devices (1, 2 and 11), grounding circuits (3 and 12) and a direct current transmission line (13). The UPFC is formed by the converting device (1) and the converting device (2). The HVDC is formed by the converting device (1) and converting device (11). The HVDC and the UPFC shares one converting device, so that cost and investment for engineering construction are saved, equipment utilization rate is improved, concentrated management and control are facilitated. The converting devices use the topological structure of the modularized multi-level converter, so that technical difficulty in component serial connection is avoided, split-phase control and modularization are facilitated, fault units can be bypassed through redundancy, operation stability of the devices is improved, on and off frequency of components is low, and device operation loss is low.

The invention relates to a unified power flow controller used for an unbalanced system. The unified power flow controller comprises a static synchronization compensator and a static synchronization series compensator. An upper part split capacitance and a lower part capacitance are arranged between the static synchronization compensator and the static synchronization series compensator. The upper part split capacitance and the lower part split capacitance are connected in series and then respectively connected with the static synchronization compensator and the static synchronization series compensator in parallel. The upper part split capacitance and the lower part split capacitance are connected in series and then a split capacitance branch circuit is formed. A midpoint of the split capacitance branch circuit is connected with a neutral point of the static synchronization series compensator. Output ends of the static synchronization compensator and the static synchronization series compensator are respectively connected with a power grid. The unified power flow controller is convenient to split-phase control and modularization design, small in running loss, good in voltage control capacity, good in zero-sequence current controlling, few in element quantity, low in cost and high in cost performance.

The invention provides a dynamic optimization scheduling method for the active power distribution network. The method comprises steps of firstly, constructing an active and reactive coordination scheduling model of the active distribution network; secondly, refining the time scale on the basis of the active and reactive coordination scheduling model of the active power distribution network in thefirst step, setting the time interval to be 15 minutes, and solving an output plan in the scheduling period of the next four hours; and finally, establishing an ultra-short-term prediction model of renewable energy and load and an output prediction model of the controllable distributed power supply by taking the output plan as a reference value, performing adjusting by using multi-step dynamic rolling in a limited time domain at a time interval of 5 minutes, setting the rolling duration to be 15 minutes, and realizing closed-loop control through a feedback correction link.

The invention supplies a DC superconduction fault current limiter, whose structure is: two superconduction coupling coil w1 and w2, has the same inductance wrapped on ring shaped core and one superconduction coil w1 is current limiting inductor whose two ends are connected to load loop, and another superconduction coil w2 as bias winding is connected to DC power source E2 and resistor R2 in series, w1 and w2 cooled by cooling device current limiting effect. The invention has advantages is: notable current limiting effect and low loss; short response time and high reliability, when the system operates normally, superconduction coil has very small stored energy and won't create overvoltage after accident protection; detecting, triggering and current limiting are integrated without need of adding control circuit, simple structure and small volume. The invention can satisfy DC fault protective device of individual system such as ship, plane, oil platform, mobile communication station and electric automobile.

The invention provides a realization method for functions of an adaptive load type distribution transformer. The realization method comprises the following steps of setting adaptive load type distribution transformer motion constant values which include a three-phase load unbalance adjusting constant value, a phase-splitting reactive compensation constant value, a load capacitance-modulating current constant value and a load voltage-modulating voltage constant value, and according to the set adaptive load type distribution transformer motion constant values, performing three-phase load balance control, phase-splitting reactive compensation control, rated capacity operation model adjusting control and voltage tap shift adjusting control. The realization method fulfills an aim of adaptive loads by scientifically setting the load capacitance-modulating motion constant value and combining the three-phase load unbalance adjustment and phase-splitting reactive compensation strategy, helps to effectively reduce operation loss of the distribution transformer and low-voltage network wire loss, improve the economic operation level of the power distribution area and guarantee power supply quality to users.

The invention relates to a tower-top cyclone purification method and a device for a recycling hydrogen desulfurization tower. The invention provides a tower-top cyclone purification method for a recycling hydrogen desulfurization tower, which comprises the following steps: carrying out a countercurrent contact reaction between sulfur-containing mixed gas entering the recycling hydrogen desulfurization tower and absorption liquid in the recycling hydrogen desulfurization tower, sequentially performing countercurrent absorption and cyclone absorption on the sulfur-containing mixed gas so as to remove sulfur in the mixed gas, and obtaining the mixed gas with the absorption liquid; and performing gas-liquid cyclone separation on the mixed gas with the absorption liquid so as to obtain the purified mixed gas. The invention also provides a tower-top cyclone purifying device for the recycling hydrogen desulfurization tower.

The invention is concerned with the compensation equipment that uses for electrification railroad reactive power compensation and the electrical energy quality control, including: two groups of passive filters using to provide reactive power for electrification railroad locomotive and filters the harmonic current of the electrification locomotive; two groups of contravariant equipments using to create current that can control the breadth value, the phase and the frequency; two groups of transformers using to coupling the current from the two contravariant equipments to the supply are of the electrification railroad; the public direct-current unit using to transform the active power between the two groups of contravariant equipments and provide the direct-current to the two groups of contravariant equipments. The invention can process power factor compensation for the electrification railroad supply system, control the quality of the electricity energy.

The invention, which belongs to the optimization operation field of the power system, discloses a linear approximation solution method of voltage and reactive power optimization of a distribution network. An active distribution network reactive power optimization module is established by using reactive power outputs of a distributed power supply and a discrete reactive power regulating device in a distribution network as state variables and using the operation transmission loss of the distribution network as an objective function; linearization is carried out on an active distribution network reactive power optimization module to obtain a linear approximation model; and alternate iteration is carried out on a loaf flow analysis and the linear approximation model to solve a solution approximating an original non-convex problem. According to the invention, for the distribution network design with loop network operation, the reactive power regulation capability of the distributed power supply can be fully utilized to realize coordinated cooperation with other reactive-load compensation devices; over-voltage and under-voltage problems caused by grid connection of a distributed power supply can be solved; the operation losses of the distribution network can be reduced; the capability of the distribution network for absorbing the distributed power supply can be improved; the safe and economic operation of the distribution network can be guaranteed; and the model solution becomes simple and reliable and no non-feasible solution is generated.

The invention relates to a configuration method for on-load capacity regulating power distribution transformers, in particular to a configuration method for capacity regulating and value fixing of an on-load capacity regulating power distribution transformer. The method includes the steps of obtaining technical performance parameters of an on-load capacity regulating power distribution transformer; determining a load rate of the on-load capacity regulating power distribution transformer in a large rated capacity operation mode; determining operation consumption of the on-load capacity regulating power distribution transformer; determining a critical load rate; determining a low voltage side current set value of the on-load capacity regulating power distribution transformer; and determining whether the technical performance parameters of the on-load capacity regulating power distribution transformer are changed. According to the configuration method for capacity regulating and value fixing of the regulated capacity distribution transformer, by the analysis and calculation of the technical performance parameters of the on-load capacity regulating power distribution transformer, the capacity regulating and value fixing configuration scheme of the on-load capacity regulating power distribution transformer from a small rated capacity mode to a large rated capacity operation is determined, and the purpose of reducing transformer operation consumption and economic operation is achieved.

The invention discloses a unidirectional direct current-direct current autotransformer for transmitting a direct-current power between two direct-current systems in a unidirectional mode. On the basis of optimized designs of a converter, a rectifier, and an alternating-current link, defects of large converter capacity, large alternating-current link capacity, and high running losses according to the existing unidirectional direct current-alternating current-direct current conversion technology can be overcome. A voltage source type converter is used for controlling an alternating-current voltage of the unidirectional direct current-direct current autotransformer, thereby realizing controlling of a direct-current power transmitted between a low-voltage first direct-current system and a high-voltage second direct-current system or a direct-current power transmitted between a high-voltage second direct-current system and a low-voltage first direct-current system and thus realizing power transmission between the two direct-current systems. Moreover, the unidirectional direct current-direct current autotransformer has the advantage of configuration of the bidirectional direct-current fault isolation capability. In addition, the invention discloses corresponding high-voltage-side and low-voltage-side direct-current fault isolation methods.

The invention discloses a coordination control method applied to a flywheel energy storage matrix system of a wind power plant. The method comprises the following steps of: (1) establishing a wind power plant flywheel energy storage matrix topological structure; (2) establishing a control system of a flywheel energy storage matrix; (3.1) performing flywheel energy storage matrix system discharge control, wherein when Prfw is less than or equal to POmaxj, a flywheel energy storage unit j is solely connected, and when Prfw is more than or equal to POmax1, first m flywheel energy storage units with the highest rotation speed need to be selected one by one; and (3.2) performing flywheel energy storage matrix charge control, wherein when the absolute value of Prfw is less than or equal to PImaxj, the flywheel energy storage unit j is solely connected for energy storage, and when the absolute value of Prfw is more than or equal to PImaxn, first m flywheel energy storage units with the lowest rotation speed need to be selected one by one. By virtue of the coordination control method, the advantages of the flywheel energy storage matrix system is given full play more effectively, the unit switching loss and operation loss are reduced, the stability of the flywheel energy storage matrix system and a power system is ensured, and thus the quality of electric energy output from wind power is improved.

The invention provides an absorbent pelletizing method comprising the step that: a powder material used in absorbent shaping is pelletized in a rotation pelletizing device. The method is characterized in that the water content in the powder material used in absorbent shaping is 30-45wt%. With the method provided by the invention, during the pelletizing proved, dust amount is low, powder material loss is low, and working environment is greatly improved. The method provided by the invention is easy to operate, such that labor intensity is greatly reduced, and production efficiency is improved.

The invention relates to a single-phase electric energy quality controller for an electrified railway power supply system, which is characterized by comprising a load side converter, a no-load side converter, a DC unit, a capacitive impedance and a booster transformer, wherein the load side converter and the no-load side converter exchange energy through the DC unit to form a back-to-back rectifier inverter; and the load side converter is connected with the capacitive impedance, and the no-load side converter is connected with the booster transformer. The controller provided by the invention has functions of active power control, reactive power compensation and harmonic compensation, and is capable of effectively improving electric energy quality in a traction power supply system of the electrified railway and reducing system loss.

The invention provides a novel superconductive controllable reactor which mainly comprises a superconducting field winding, an excitation DC power supply, a detection control unit, an AC winding, a short-circuit winding and an iron core and so on. The novel superconductive controllable reactor can timely adjust the inductance value according to the running state of an electric grid so as to cause the reactive power in the electric grid to be compensated timely and completely, thus reducing the operation loss of the electric grid and improve the power supply quality of the system. Compared with traditional controllable reactor, the novel superconductive controllable reactor is safe and reliable in working and has higher overvoltage and overloading capacity; furthermore, the service life is long, the running cost is low and the installation and maintenance are easy. The advantages of the reactor are more distinct in the 35KV or higher electric grid levels.

A current converter module unit, a converter, a direct-current transmission system and a control method. In the converter module unit, the positive electrode of a first switch module (T1, D1) is connected to the positive electrode of a first energy storage element (C1), and the negative electrode of a second switch module (T2, D2) is connected to the negative electrode of the first energy storage element; the negative electrode of a diode (D6) is connected to the positive electrode of the first switch module, the positive electrode of the diode is respectively connected to the negative electrode of a second energy storage element (C2) and the negative electrode of a fourth switch module (T4, D4), the positive electrode of the fourth switch module is connected to the negative electrode of a third switch module (T3, D3), and the positive electrode of the second energy storage element is connected to the positive electrode of the third switch module; and the positive electrode of the third switch module is connected to the positive electrode of a fifth switch module (T5, D5), and the negative electrode of the fifth switch module is connected to the negative electrode of the second switch module. This structure can provide a favourable direct-current side fault ride-through performance, thereby overcoming the limitation and deficiency of structures such as a full-bridge module and a clamping double-module, and having better economical and technological performances.

The invention provides a method and a device for preventing interior of a disengager from coking by quickly extracting oil gas from the fluidized catalytic cracking disengager of petroleum, wherein the device comprises a primary cyclone separator, a straight connection component which is arranged on the tail end of exit tube of the primary cyclone separator, a top cyclone separator, an oil gas drainage tube, an inertial separation component which is on the lower end of inlet of the drainage tube, a stripping section, an anti-coking steam ring and a disengager. The oil gas and the steam within the disengager are discharged out from the oil gas drainage tube only, the lower end of opening of the oil gas drainage tube is equipped with the inertial separation component so as to reduce the catalyst which is entered into the oil gas drainage tube by splashing while discharging from the dipleg of the primary cyclone separator and the dipleg of the top cyclone separator, the exit tube of the primary cyclone separator is tangentially connected to the oil gas drainage tube by means of the straight connection component, and a rotational flow is formed on the upper section of the oil gas drainage tube, so that a vortex low-pressure region is formed and the drainage draft of the oil gas is increased. The method and the device for inhibiting coking of residue fluid catalytic disengager provided by the invention have the advantages that the structure is simple and compact, the fast and efficient separation between the oil gas and the catalyst is ensured, the oil gas within the space of the disengager is extracted quickly, the retention period of the oil gas within the disengager is reduced greatly, the coking phenomenon within the disengager is inhibited effectively and therefore the operation cycle of the catalytic device is prolonged.

The invention discloses an inductor and resistor compound superconducting reactor. The technical keys are that the superconducting reactor mainly comprises a superconducting inductive coil, a superconducting non-inductive coil, a low-temperature Dewar component, low-temperature insulating sleeves, superconducting binary current leads, superconducting transition leads and low-temperature refrigerant pipelines, wherein the superconducting inductive coil and the superconducting non-inductive coil are both completely soaked in low-temperature refrigerants inside the low-temperature Dewar component; the low-temperature insulating sleeves, the superconducting binary current leads and the low-temperature refrigerant pipelines are all connected with sealing cover plates of the low-temperature Dewar component; the superconducting inductive coil is connected in series with the superconducting non-inductive coil through the superconducting transition leads, and is connected with the superconducting binary current leads, so as to form the inductor and resistor compound superconducting reactor provided with a fixed inductance value and a variable resistance value. The superconducting reactor has the application characteristics of both the fixed inductance value of a single superconducting reactor and the variable resistance value of a single superconducting non-inductive coil, and can simultaneously have the current-limiting and power compensating function of an electric power system, as well as the high-efficient neutral point grounding function.