30results about How to "Reduce rated capacity" patented technology

The invention relates to a megawatt wind power storage battery combined independent power supply system, which comprises a plurality of wind turbines, a storage battery energy storage regulation system, a plurality of storage battery packs, an external standby power supply and unload charges, wherein the output ends of the wind turbines are connected with a high-voltage main bus; the storage battery energy storage regulation system comprises a plurality of charge and discharge management systems and a system main monitor, wherein the alternating current side of each charge and discharge management system is connected with the high-voltage main bus after the alternating current side is connected with a public bus, and the system main monitor conducts information interaction with the charge and discharge management systems through a plurality of CAN interfaces and works according to the commands of the charge and the discharge management systems; each storage battery pack is connected with the direct current end of the corresponding charge and discharge management system and conducts bidirectional regulation of active power and reactive power jointly with PCC points formed by the high-voltage main bus and the storage battery energy storage regulation system within the voltage range from the upper limit to the lower limit to enable the voltage and the frequency of the PCC points to be stable; the external standby power supply supplies power to the high-voltage main bus under the control of the system main monitor in the storage battery energy storage regulation system to enable the voltage and the frequency of the PCC points to be stable; and the unloading charges are used to consume the power output by the high-voltage main bus under the control of the system main monitor in the storage battery energy storage regulation system to enable the voltage and the frequency of the PCC points to be stable.

The invention provides a method for breaking a high-voltage (HV) superconducting current-limiting direct current (DC) circuit breaker. The method comprises the following steps: when a HVDC side is in short-circuit fault and current / current rising steepness rises rapidly and reaches a critical value of a current limiter, a superconducting material quenches immediately, impedance rises steeply, short-circuit current is limited within set values, and meanwhile, an instruction is sent to an ultra-quick mechanical switch; the ultra-quick mechanical switch acts immediately, enables contacts to separate at an ultrahigh rigid separating speed so as to form a physical gap and generate electric arcs, and immediately sends a breaking instruction to a power electronic switch; the power electronic switch quickly breaks the short-circuit current and enables the electric arcs between the contacts to be extinguished, so as to form an isolated fracture; when the contacts are separated to final open positions and current in a lightning arrester is attenuated to zero, the HV superconducting current-limiting DC circuit breaker completes a whole breaking process, and a HVDC transmission power grid is isolated from a faulty line. The method has the advantages that the cost performances of different components are taken into account comprehensively, so that the cooperation is optimized; the number of components and devices is reduced as much as possible, so that the size is reduced, the weight is reduced, and the reliability is improved.

The invention provides a novel integrated photovoltaic unified power quality adjustment device and a control method thereof. The device comprises a series transformer, a series converter, a parallel converter, a direct current bus capacitor, a boost converter and a photovoltaic array. When the power grid voltage is reduced, a complex power control method is enabled. The series converter can provide active and reactive power for a load. When the power grid voltage is normal and the power grid voltage increases, the series converter works in a rectification state. The parallel converter works inan inversion state. The direct current bus capacitor is in a charging state. When the power grid voltage drops, the series converter works in the rectification state and the inversion state with thedeepening of the voltage drop degree of a power grid. The direct current bus capacitor is in a charging state and a discharging state with the deepening of the drop degree. The parallel converter works in the inversion state and the rectification state with the deepening of the voltage drop degree of the power grid. When the power grid voltage is interrupted, the photovoltaic array is connected with a direct current bus through the boost converter to provide power for the load.

The invention discloses an active power filtering apparatus applicable to a circuit which comprises a system power supply and a harmonic load; the active power filtering apparatus comprises a transformer, an inverter and a modulation signal generation module; a primary side winding of the transformer is connected with the harmonic load in series to be connected to a loop which is formed by the system power supply and the harmonic load; the modulation signal generation module is used for generating a modulation signal of the inverter, wherein the modulation signal is formed by superposition of a reversely amplified transformer primary side fundamental current and positively amplified transformer primary side harmonic current; and the inverter is used for converting a direct current signal into an alternating current signal with the same frequency as the modulation signal to be injected to a secondary side winding of the transformer, so as to enable the transformer primary side fundamental wave equivalent impedance to be Z<1>+(1-<alpha>)Z<m> and to enable the transformer primary side n harmonic wave equivalent impedance to be nZ<1>+(1+<beta>)nZ<m>. Based on fundamental wave and harmonic wave magnetic flux mixed control, the transformer primary side relative fundamental wave short circuit and relative harmonic wave open circuit are realized, and the harmonic current is forced to flow to a passive branch, so that an active filtering effect is played.

The invention discloses an ice-reservation heat pump energy-saving unit, which comprises the following parts: cold water unit, refrigerating working fluid cooling water circulation system, ice-reservation system, indoor cold-and-heat supply system and computer self-control device (13), wherein the cold water unit contains compressor (1), first heat-exchanger (5), electronic expansion valve (6), second heat-exchanger (7), plate-type refrigerating working fluid heat-exchanger (2), first electronic three-way valve (3), second electronic three-way valve (8), electromagnetic valve (9), which forms a loop through refrigerating working fluid pipe connection. The invention can be applied in the air-conditioner energy-saving domain widely.

The invention discloses a plug-and-play active electric power filtering device and is applicable to a circuit comprising a system power source and a harmonic load. The plug-and-play active electric power filtering device comprises a mutual inductor, an inverter and a modulation signal generation module, wherein a winding at a primary of the mutual inductor is a power transmission wire penetrating between the system power source and the harmonic load of the internal portion of a core, the modulation signal generation module is used for generating a modulation signal of the inverter, the modulation signal is generated through superposing a primary fundamental current after reverse amplification and a primary harmonic current after positive amplification, and the inverter is used for converting a DC signal into an AC current signal same as the modulation signal in frequency and injecting the AC current signal to a secondary winding of the mutual inductor to make primary fundamental equivalent impedance of the mutual inductor be Z1+(1-alpha)Zm and make primary nth-order harmonic equivalent impedance of the mutual inductor be nZ1+(1+beta)nZm. The plug-and-play active electric power filtering device is advantaged in that the specially-produced mutual inductor is employed to make the active filtering device realize the plug-and-play function, the primary of the mutual inductor can be controlled for being in short circuit relative to a fundamental state and for being in an opening circuit relative to a harmonic state, and the filtering function is further realized.

The invention discloses a hybrid energy storage system for stabilizing a wind power fluctuation. The hybrid energy storage system aims at solving the problems of complicated structure and working state optimization of an energy storage system in the prior art. The hybrid energy storage system comprises a supercapacitor, a storage battery and a hysteresis comparison controller, wherein the supercapacitor and the storage battery are cascaded; and the hysteresis comparison controller is connected with the supercapacitor and the storage battery, and provided with a first threshold, a second threshold, a third threshold and a fourth threshold which are ascended and correspond to the dump energy of the supercapacitor. Therefore, frequent action, charging and discharging of the storage battery can be effectively avoided; the service life is prolonged; a charge state fluctuation of the supercapacitor is reduced; the whole economy of the hybrid energy storage system is improved; and a working state of the energy storage system is optimized. The hybrid energy storage system is applicable to research, development, design, operation control, electric energy measurement, expense management and the like of a wind power generation system, has the characteristics of simple structure, good stability, environmental protection and reproducibility, and has a high industry-university-research value.

The invention discloses a plug-and-play specified subharmonic active electric power filtering device. The device comprises a mutual inductor, an inverter and a modulation signal generation module, wherein a winding at a primary of the mutual inductor is a power transmission wire penetrating between the system power source and the harmonic load of the internal portion of a core, the winding has one loop, the core of the mutual inductor is a fine long cylindrical structure or is a fine long cuboid structure suitable for a busbar, the modulation signal generation module is used for generating a modulation signal of the inverter, the modulation signal is generated through superposing a primary fundamental current after reverse amplification and a primary specified subharmonic current after positive amplification, and the inverter is used for converting a DC signal into an AC current signal same as the modulation signal in frequency and injecting the AC current signal to a secondary winding of the mutual inductor to make primary fundamental equivalent impedance of the mutual inductor be Z1+(1-alpha)Zm and make primary nth-order specified subharmonic equivalent impedance of the mutual inductor be nZ1+(1+beta)nZm. The device is advantaged in that the plug-and-play function is realized through the mutual inductor, for specified subharmonic compensation, capacity and cost of the whole set device are reduced.

The invention relates to a wind power generation system. According to the wind power generation system, flywheels are taken as energy storage devices, a one-pole dc magnetic driver (HET) is taken as flywheel energy transmission equipment, the stable power generation function is realized, and energy transmission advantages of the HET perform; a vertical flexible flywheel and a suspension type flexible flywheel are further employed, problems of a large-mass flywheel and a bearing are solved. HET speed change transmission is employed between the flywheel and a generator to greatly improve wind energy capture efficiency. Three schemes for energy transmission among a wind wheel, the generator and the flywheel, the first scheme is a no-HET scheme between the wind wheel and the generator, namely, an energy storage device and energy transmission equipment thereof are added to a routine wind power system in the prior art, the second scheme is an independent HET scheme between the wind wheel and the generator, the third scheme is a scheme through which the wind wheel, the generator and the flywheel are respectively connected with one HET half matching part.

The invention provides a telescopic contact assembly for a thyristor on-load tap switch. The telescopic contact assembly for the thyristor on-load tap switch comprises insulation supports symmetrically fixed to the two ends of a touch rod through locating pins. The insulation supports are connected through a connecting piece. Each installation support is provided with a telescopic contact perpendicular to the connecting piece. Static contacts are symmetrically arranged at the two ends of an orientating guide board. The telescopic contact at one end of the connecting piece is provided with a lead connecting piece connected with a thyristor circuit and used for enabling the telescopic contact and one static contact to be connected or disconnected with the thyristor circuit and the other end of the connecting piece is provided with a lead connecting piece used for enabling the touch rod and the other static contact to be connected or disconnected with the thyristor circuit. Compared with the prior art, the telescopic contact assembly for the thyristor on-load tap switch has the advantages that the requirement for timing sequence control of the thyristor circuit is satisfied, the number of moving contacts and the number of the static contacts can be increased, recovery voltage between fractures is effectively reduced, and therefore the different requirements for voltage adjustment or capacitance adjustment of a transformer are satisfied.

The invention provides a method for breaking a high-voltage (HV) superconducting current-limiting direct current (DC) circuit breaker. The method comprises the following steps: when a HVDC side is in short-circuit fault and current / current rising steepness rises rapidly and reaches a critical value of a current limiter, a superconducting material quenches immediately, impedance rises steeply, short-circuit current is limited within set values, and meanwhile, an instruction is sent to an ultra-quick mechanical switch; the ultra-quick mechanical switch acts immediately, enables contacts to separate at an ultrahigh rigid separating speed so as to form a physical gap and generate electric arcs, and immediately sends a breaking instruction to a power electronic switch; the power electronic switch quickly breaks the short-circuit current and enables the electric arcs between the contacts to be extinguished, so as to form an isolated fracture; when the contacts are separated to final open positions and current in a lightning arrester is attenuated to zero, the HV superconducting current-limiting DC circuit breaker completes a whole breaking process, and a HVDC transmission power grid is isolated from a faulty line. The method has the advantages that the cost performances of different components are taken into account comprehensively, so that the cooperation is optimized; the number of components and devices is reduced as much as possible, so that the size is reduced, the weight is reduced, and the reliability is improved.

The invention relates to the technical field of energy source devices, and discloses a hybrid energy source energy buffer balanced micro-grid for a drilling machine. The hybrid energy source energy buffer balanced micro-grid comprises an energy conversion unit, a power supply access, distribution and conversion bus coupler unit, main transformation units, a super capacitor energy storage unit, a load loop electricity conversion and bus coupler unit and a master control unit. The hybrid energy source energy buffer balanced micro-grid is reasonable and compact in structure, and convenient to use; by a plurality of paths of power supply or various power supply, site resources are utilized to the maximum possible extent; and energy complement and comprehensive utilization are realized. The super capacitor energy storage unit is provided with charging current by rectifiers of a plurality of main transformation units, so that capacity sharing is realized. By the plurality of main transformation units, segmental power supply is realized by combining with the electricity load characteristics. By a complementary work generation device or an internal combustion engine preheating generation device, the system power is dynamically adjusted and balanced; the oscillation frequency of the system and the peak and valley difference value of the load power curve are reduced; and the hybrid energy source energy buffer balanced micro-grid has the characteristics of being safe, labor-saving, simple, convenient and efficient.

The invention relates to a storage battery energy storage conditioning device, which is characterized by comprising at least two charging and discharging management systems and a main system monitor, wherein the AC sides of the charging and discharging management systems are connected with a public bus-bar in parallel, and then are connected with a high voltage main bus-bar through a transformer,and the DC side of each charging and discharging management system is connected with a storage battery so as to control the two-way conditioning of active power and reactive power of the storage battery and PCC points formed by the main bus-bar and the public bus-bar in a range of upper limit and lower limit voltage values, so that the voltage and frequency of the PCC points are stable; and the main system monitor is in information interaction with the charging and discharging management systems through a plurality of CAN interfaces, and controls an external standby power to supply power to the high voltage main bus-bar or control unloading charges to consume electric energy output by the high voltage main bus-bar according to the instructions of the charging and discharging management systems, so that the voltage and frequency of the PCC points are stable. The invention is easy to realize, saves cost, and is suitable for combining an independent power system with a megawatt-class wind generating unit, and supplying power to offshore oilfield platforms and remote areas.

The invention provides a novel integrated photovoltaic unified power quality adjustment device and a control method thereof. The device comprises a series transformer, a series converter, a parallel converter, a direct current bus capacitor, a boost converter and a photovoltaic array. When the power grid voltage is reduced, a complex power control method is enabled. The series converter can provide active and reactive power for a load. When the power grid voltage is normal and the power grid voltage increases, the series converter works in a rectification state. The parallel converter works inan inversion state. The direct current bus capacitor is in a charging state. When the power grid voltage drops, the series converter works in the rectification state and the inversion state with thedeepening of the voltage drop degree of a power grid. The direct current bus capacitor is in a charging state and a discharging state with the deepening of the drop degree. The parallel converter works in the inversion state and the rectification state with the deepening of the voltage drop degree of the power grid. When the power grid voltage is interrupted, the photovoltaic array is connected with a direct current bus through the boost converter to provide power for the load.

The invention relates to a water consuming method of a diamond wire cutting crystalline silicon production line. The diamond wire cutting crystalline silicon production line is provided with at leastone wire cutting machine, each wire cutting machine adopts a diamond wire saw for cutting silicon rods into silicon wafers, and circulating water coming from a water storage tank of the wire cutting machine washes a cutting part in the cutting process of the diamond wire saw; waste water after cutting part washing is collected and treated, and production water is obtained; and production water ismixed into circulating water, and circulating water is supplied to the wire cutting machine for usage. Waste water produced by the diamond wire cutting crystalline silicon production line is treated into production water, purified water is supplemented and used as circulating water to continue entering the diamond wire cutting crystalline silicon production line for cooling water and / or washing water after compositions are mixed, on the one hand, lots of water can be saved, and waste water discharging is reduced; and on the other hand, water consumption and a water discharge peak value can belowered, and the rated capacity of equipment is lowered.

The invention discloses an improved control method for a silicon carbide-based high-frequency hybrid filter, and relates to the technical field of high-frequency harmonic parallel compensation, by connecting the silicon carbide-based high-frequency hybrid filter in series between the grid and the active filter During the period, the rated capacity of the active filter can be reduced by the voltage division effect of the capacitor of the high-frequency hybrid filter. Due to the introduction of the capacitor, the phase shift of the compensation current generated by the filter will occur. Through the method of the present invention, the current signal Extract specific harmonic components, and perform first-order differential, proportional, and compensation on the harmonic components, and then inversely transform the dq rotating coordinate system, and output harmonic currents with the same frequency and opposite phase as the harmonic source through the control of the hysteresis loop controller.

The invention discloses a hybrid energy storage system and a generator inverter system. The hybrid energy storage system comprises: a super capacitor; a storage battery which is used for outputting adirect-current power supply so as to provide average power required by the load; and a DC-DC converter, wherein the DC-DC converter comprises a first capacitor, the first capacitor and the super capacitor are connected in series to form a capacitor bank, and the capacitor bank is used for being connected with a voltage bus of the generator inverter system. The DC-DC converter is used for performing corresponding voltage conversion on the direct-current power supply output by the storage battery under the control of the main control unit and outputting the direct-current power supply to the first capacitor, so that the capacitor bank provides peak power required by a load. The hybrid energy storage system can solve the problems that: in the prior art, the working voltage range of a super capacitor in a hybrid energy storage system is narrow, the utilization rate of a storage battery is low, and the system cost is too high due to the fact that the capacity of the hybrid energy storage system is too large.

The invention belongs to the technical field of metallurgy and in particular relates to a continuous ore reduction and hot-charging steelmaking device. The device comprises a vibration type cyclone reduction furnace, an ore powder ball forming preheating device arranged on one side of the cyclone reduction furnace, an electrical furnace smelting separation device and a fuel injection device which are arranged at one end of the vibration type cyclone reduction furnace, a dust removal device connected to the ore powder ball forming preheating device, a water cooling device connected to the vibration type cyclone reduction furnace, the ore powder ball forming preheating device and the electrical furnace smelting separation device, and an electrical control device used for controlling the parts. According to the device, the ironmaking and steelmaking processes are integrated, and high-quality molten steel with low harmful element content is directly produced from ores; the device is suitable for producing excellent special steel, the steelmaking process is carried out by the 100% ores without waste steel, a system is good in sealing property, coal gas and dust leak are avoided, and the surrounding environment is effectively protected.