150results about How to "Guarantee the quality of power supply" patented technology

The invention discloses an energy storage power supply cabinet. The cabinet comprises: a storage battery set for storage and release of electric energy; an AC input wiring terminal, which is connected to an external AC power supply and is used for connection with the AC power supply; an energy storage bidirectional current transformer for charging or discharging the storage battery set; a control management system, which is connected to the storage battery set and the energy storage bidirectional current transformer and is used for monitoring charging and discharging status of the storage battery set and working status of the energy storage bidirectional current transformer and for monitoring and management of electric energy of the cabinet; and an AC output wiring terminal for connection with a load. The cabinet provided by an embodiment of the invention can work in an on-grid power supply system to ease the burden on a public power grid in a peak period of power use and ensure safe power use of users. The cabinet can also work in an off-grid power supply system to output high-quality stable electric power and ensure reliable and safe power supply. Besides, the cabinet can improve efficient usage of renewable energy. The invention further discloses an on-grid power supply system and an off-grid power supply system.

The invention discloses a non-stick overvoltage and under-voltage protector with a leakage protection function. The non-stick overvoltage and under-voltage protector comprises a box body and a control unit, wherein the control unit comprises a power circuit (1), a current sampling circuit (2), a voltage sampling circuit (3), a microprocessor (4), a key processing circuit (5), a working state indicating circuit (6), a magnetic relay driving circuit (7), a magnetic latching relay (8), a leakage mutual inductor (9), an energy-storage capacitor (10) and a chip peripheral circuit (11). According to the non-stick overvoltage and under-voltage protector with the leakage protection function provided by the invention, a power supply is switched on automatically when the power voltage restores to a normal voltage range after an under-voltage protection action is taken, so that the continuity of power supply is ensured, and the power supply quality is ensured; and after a leakage protection action is taken, the power supply is switched on automatically after a fault is cleared and a manual key is pressed for confirming, the power supply continuity is ensured, and personal safety is protected.

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 discloses a DC line carrier communicator, which is characterized in that: the communicator consists of a transmitting unit and a receiving unit, wherein, the transmitting unit is provided with a modulator, a carrier generator, a data buffer, a push-pull driver and a low-pass filter; and the receiving unit is equipped with an amplitude limiter, a band-pass filter, a frequency selective amplifier, an emitter follower, an envelope detector, a voltage comparator and a voltage reference source. The invention has the advantages of: simple structure, low cost, providing high direct current of a few amperes to dozens of amperes to loads, ensuring the quality of power supply of current, and enhancing the anti-interference ability of the communicator and also the confidentiality of data transmission.

The invention discloses an apparatus and a method of independent wind power driven seawater desalination. The method comprises the steps that: step one, establishing an independent grid: an independent grid is established through a bi-directional inverter by using electric energy from a storage battery; step two, wind power grid-connecting: electric energy generated from each aerogenerator is delivered to the independent grid through aerogenerator controllers and grid-connecting inverters; step three, load connecting: water supplying pumps, high pressure pumps and reverse osmosis membrane components are connected to form independent membrane modules, load circuits of the independent membrane modules are connected in parallel, and then connected to an electric output of a power system; step four, system coordination dynamic controlling. Previously, wind power driven seawater desalination requires large capacity storage batteries for ensuring the stability of power supply. With the present invention, the technical problem is solved, and a novel independent wind power driven seawater desalination mode is provided. According to the present invention, energy cost in fresh water producing with the present apparatus is substantially lower than that with systems of other similar types. Thus, the apparatus and the method have good prospect to be developed and applied in the field of seawater desalination.

The invention discloses a transformer area load regulation and control method containing an optical storage charging station, and the method comprises the steps: solving a district load regulation andcontrol multi-target model based on particle swarm optimization, and obtaining the optimal charging starting time of an electric vehicle user and the selected optical storage charging station; and according to the optimal charging starting time of the electric vehicle user and the selected optical storage charging station, guiding the electric vehicle with the charging requirement in the power distribution network to the selected optical storage charging station for charging under the optimal charging starting time. The beneficial effects of the method are that the method carries out the transformer area load regulation and control through combining with the characteristics of a charging load, alleviates the impact caused by the access of the optical storage charging station to a distribution network, and effectively guarantees the transformer area power supply quality; moreover, the method does not need investment of new equipment, and can effectively reduce the load regulation and control cost. 2) the responsivity and satisfaction of the load side are fully considered, the satisfaction is improved while the power demand of the user is ensured, and 3) the economic benefit and theenvironmental benefit are both considered, the load variance can be effectively stabilized, and the carbon emission is reduced.

The invention discloses a power quality management method for an active distribution network. The method comprises a step of grasping the output characteristics of distributed small hydropower and photovoltaic units through investigation, a step of integrating and analyzing the historical data of an electricity consumption information collection system by using big data mining technology, a step of performing the coordinated control of power quality, a step of performing power quality optimization, and a step of performing active power distribution. According to the method, the distribution network is hierarchically and regionally controlled based on an active distribution network radial structure, a distributed power source and a reactive power regulating device are fully used, the powerquality control of the active distribution network is achieved by using a top-down manner, the voltage is always in a safe interval, and the quality of the power supply is ensured.

The invention provides an optical storage and charging microgrid system and a control method thereof. The optical storage and charging microgrid system comprises a photovoltaic power generation unit,an energy storage unit, a photovoltaic controller, an energy storage converter and a grid-connected and off-grid switching unit, the photovoltaic power generation unit is connected with a direct current bus through the photovoltaic controller, an energy storage battery and the energy storage converter are connected with the direct current bus, and a charging pile is directly hung on the direct current bus to form a direct current network; wherein the energy storage converter is connected with a power grid and a load through the grid-connected and off-grid switching unit to form an alternatingcurrent network; the photovoltaic controller is used for controlling the photovoltaic power generation unit to charge the energy storage unit; and the grid-connected and off-grid switching unit is used for realizing grid-connected and off-grid state switching of the energy storage converter. By adopting the technical scheme of the invention, the energy loss is reduced, the economy is improved, thegrid-connected and off-grid seamless switching is realized, and the power supply quality of the system is ensured; and when the power grid is powered off or abnormally fluctuates, off-grid operationcan be fully automatically realized, and uninterrupted development of optical storage and charging services is ensured.

The invention provides a power supply control cabinet system and an operation method of the power supply control cabinet system. The power supply control cabinet system comprises a central processing unit module, a network module, a signal collection module, a displayer, an input terminal, a power input module, a power output module and a power supply switching module, wherein the power input module comprises a plurality of input channels, the power output module comprises a direct-current output module and an alternating-current output module, and the power supply switching module is connected with the power input module and switches a corresponding power supply loop into a system circuit according to user hand-operated selection or system presetting or a signal analysis result. By means of real-time monitoring of a central processing unit and a signal collection device, the defect that a traditional control cabinet is low in control accuracy is overcome in terms of input control and output control of power supplies, the situation that the over-current and the under voltage happen to circuit and other situations can be timely prevented, safety performance of a circuit system is effectively ensured, and meanwhile power supply safety and power supply quality of the system is ensured by setting multiple modes to conduct selection and switching on the power supplies.

The invention discloses a three-phase variable leakage current protective device, belonging to the field of protective devices used for protecting safeties of persons and electrical apparatuses. The device comprises a slowly-changing signal forming circuit, a signal amplifier circuit, a memory circuit, a clock circuit, a phase variable decomposer circuit, a positive/negative leakage current identifier circuit, a 150Hz square wave, an action current presetting device circuit, a break-time presetting device circuit, a time delay monostable circuit, a switch on/off mechanism and a self-restoring time presetting device circuit. Compared with the prior art, the three-phase variable leakage current protective device has the advantages that: the break time can reach the standard and no override trip occurs, no negative leakage trip occurs, the self-restoring mode is randomly selected by users according to local situations, special testers are configured, the power-on test is realized, and the like.

An active dynamic compensation device and distribution transformer integrated monitoring method is disclosed. A monitoring terminal conducts on-site data acquisition analysis and control, and a monitoring background conducts running state monitoring and early warning. The monitoring background is formed by a communication server, a WEB/data storage server, a work station and a network isolation device, wherein the monitoring background communicates with the monitoring terminal through a GPRS communication means. The on-site type monitoring terminal monitors real-time electric quantity data and quasi-real time non-electric quantity data, wherein the real-time electric quantity data include reactive power, harmonic current, negative phase-sequence current, zero sequence current and three-phase voltage at the low-voltage outlet of a distribution transformer and the load side, and the monitored quasi-real time electric quantity data include shift, oil level, vibration, noise and oil temperature information of the distribution transformer, and the module state and module temperature information of the active dynamic compensation device. Integrated monitoring of the active dynamic compensation device and the distribution transformer can be completed, and the application effect of the active dynamic compensation device and the economic performance and reliability of the distribution transformer are improved.

The invention discloses a wind power generation and thermal power generation set group load coordinated control system and method. The system comprises a wind power generation load change calculationmodule, a thermal power generation load dynamic compensation instruction calculation module and a thermal power generation set group dynamic adjustment module. The wind power generation load change calculation module is used for calculating the wind power generation load change quantity. The thermal power generation load dynamic compensation instruction calculation module is used for calculating the compensation load instruction of the thermal power generation set group when the wind power generation load changes according to the wind power generation load change quantity. The thermal power generation set group dynamic adjustment module dynamically adjusts the power generation load set value of the thermal power generation set according to the compensation load instruction of the thermal power generation set group. The actual output of the thermal power generation set group can be changed by dynamically adjusting the power generation load set value of the thermal power generation set according to the wind power generation load change quantity so that the load stability of the regional power grid can be maintained and the power supply quality of the power grid can be enhanced.

The invention relates to the technical field of electric power channel monitoring, in particular to an intelligent monitoring system for an electric power channel environment based on a LoRa technology. Environment information in the electric power channel environment and operation rate information of important parts such as a cable and a cable intermediate joint can be continuously and dynamically collected in real time, and the collected information is separately sent to an intelligent execution mechanism and a far-end monitoring center or a mobile monitoring terminal. Based on the operationstate, fed back by a monitoring system, of an on-site electric power transmission line, the intelligent execution mechanism can automatically start, stop or execute other operation according to preset operation conditions, and can also receive a far-end execution command to conduct the corresponding operation on environment adjustment, and therefore the operation state or environment of the electric power transmission line in an electric power channel is improved. The invention further provides multi-data fusion three-phase imbalance regulation control method based on the above intelligent monitoring system. The operation environment of the electric power transmission line in the electric power channel can be effectively improved.

The invention discloses an electric energy extracting device for cable partial discharge on-line detection. The device comprises a clamp-on transducer, a controlled rectifier and a rechargeable battery pack. When the device is used for field inspection, the clamp-on transducer of the device is connected at any position along a to-be-detected cable in a sleeving manner and can be used for inducing three-phase alternating current. The induced three-phase alternating current is sent to the controlled rectifier for rectifying, and the rectified DC can be used to charge the rechargeable battery pack, so as to provide a high-quality power supply to a load. The controlled rectifier comprises a control center, the control center samples the rectified DC voltage and compares the rectified DC voltage with the voltage of the rechargeable battery pack in real time, and through the adjustment of the conduction angle of the controlled rectifier, and the rectified DC voltage can be adjusted so as to ensure constant rectified DC voltage. According to technical scheme disclosed by the invention, the device can take electric energy any position on the cable between a switch cabinet and a terminal device and can provide the high-quality power supply for the load.

The invention discloses a capacitance monitoring method of a modular multilevel converter based on a full-bridge sub-module. The method comprises the steps of: selecting two redundant sub-modules froma certain bridge arm of the modular multilevel converter as reference sub-modules; and collecting a bridge arm current and capacitor voltage data of each sub-module on the bridge arm, monitoring capacitor voltage increments of the reference sub-modules and each sub-module in a power frequency period, and obtaining the capacitance of each sub-module capacitor on the bridge arm by utilizing the capacitance of the reference sub-modules, the capacitor voltage increments and the capacitor voltage increments of the sub-modules. According to the method provided by the invention, the capacitance value of each sub-module capacitor is determined through the ratio of the capacitor voltage increments, so that the capacitance in each sub-module of the modular multilevel converter can be effectively monitored.

The invention relates to an integrated switched reluctance machine flywheel energy storage device, belonging to the technical field of the design and preparation of the electric motor. The flywheel energy storage device comprises a switched reluctance machine and a bidirectional power inverter connected with the output end of the electric motor, wherein the outside of the switched reluctance machine is provided with a vacuum shell, the inside of the shell is provided with a stator, a rotor, an upper magnetic suspension bearing and lower magnetic suspension bearing used for supporting the rotor; the switched reluctance machine has an external rotor structure, the rotor is also used as the flywheel, a rotary inner bushing is fixed between the rotor and the stator, and a rotary outer bushing is fixed between the rotor and the vacuum shell. The device of the invention cancels the intermediate transmission unit through which the traditional flywheel is connected with the electric motor in the coupling manner and the like, thus reducing the noise and friction of the system and increasing the efficiency and reliability of the system.

The invention relates to a generator monitoring system device, comprising a common generator at the bottom. The common generator is connected with a transmission equipment at the second layer through a sensor module. The transmission equipment at the second layer is mutually connected with a monitoring management computer at the third layer and a monitoring management module independently assembled inside the monitoring computer. The device is able to carry out the data real-time collection, remote control (such as remote power generation, etc.) and analysis and statistic of the data to the common generator, which facilitates the maintenance and management, saves the manpower, material resource and financial resource, and ensures the quality of the power supply.

The invention discloses a supercritical CO2 Brayton cycle power generation system coupled with CO2. The supercritical CO2 Brayton cycle power generation system is formed by a Brayton cycle power generation unit and a CO2 energy storage unit, wherein the Brayton cycle power generation unit comprises a high temperature regenerator, a combustor, a turbine, an electric generator, a low temperature regenerator, a cooler I and a compressor I; and the CO2 energy storage unit comprises a low pressure air reservoir, a cooler II, a compressor II and a high pressure air reservoir. The CO2 energy storage unit in the power generation system can store unstable energy resources in a form of supercritical CO2, when the power demand is high, stored high temperature and high pressure supercritical CO2 stably acts to supply power through Brayton cycles, stable output of electric energy is well achieved, and thus the supercritical CO2 Brayton cycle power generation system coupled with the CO2 energy storage unit can further save energy, reduce the wind and light discharging rate, improve day and night load regulation stability and realize energy conservation and emission reduction.

An automatic switching control device for a photovoltaic micro-grid power generation system comprises a measurement control unit, a 4G wireless communication network, and a background decision system. The measurement control unit is connected to the background decision system through the 4G wireless communication network. Through the 4G wireless communication network, the measurement control unit sends grid information data to the background decision system, and/or the background decision system issues an instruction to the measurement control unit. According to the device, the whole grid is taken into consideration, multiple power parameters are detected, a decision is made based on the multiple power parameters and a background expert resource library, and a photovoltaic system with the optimal combination is connected to the grid for operation. Therefore, energy waste is avoided, and the quality of electric energy is ensured.

The invention relates to a control method for adjusting the reactive voltage of a power distribution network to ensure the electric energy quality of a low-voltage region. The method comprises the steps of 1) applying the load prediction, analyzing a next-day load demand parameter, analyzing and determining the type of each load, and establishing a load model; 2) applying the load prediction, analyzing the next-day terminal voltage information of a feeder line of a power distribution network, determining a voltage drop limit value and a voltage expected value, and determining the tapping pointof a grading voltage regulator and a to-be-switched capacitance value; 3) based on the capacitance value obtained through prediction, preparing a capacitor in advance; 4) when an intraday load is increased, adjusting the tapping point of the voltage regulator is real time or a switched capacitor to compensate the reactive power shortage. According to the invention, the next-day load prediction data is adopted as a basis, and the required value of the capacitor is prepared in advance. When the intraday load is increased, the well prepared capacitor is put into use. Therefore, on the premise that the voltage drop is ensured to be within an expected range, the power supply quality is guaranteed.