68results about How to "Achieving power balance" patented technology

The invention discloses a power control method of an energy storage system, which is used for secondary recycling of power batteries. The power control method comprises the following steps of: sequentially classifying power battery packs into a priority discharging battery pack, an effective working battery pack and a priority charging battery pack according to charged state values of the secondarily-recycled power battery packs from large to small; charging the priority charging battery pack and then the effective working battery pack during charging; and discharging the priority discharging battery pack and then the effective working battery pack during discharging. By the power control method, the battery packs are sequenced and classified in terms of priorities according to the charged states of all power battery packs, power is allocated to the battery pack with a high charging / discharging level by referring to a power given value, thus, charging and discharging frequencies of each power pack are reduced, power balance of the plurality of battery packs running in a parallel-connection manner is achieved, a part of battery packs are prevented from frequently running in charging and discharging ways, the service life of the energy storage system is comprehensively prolonged, and the running stability and safety of the system can be further improved.

The invention relates to a micro-grid hybrid energy storage system power distribution method based on fuzzy control rules. A power distribution strategy of variable-filter time constant in a micro-grid hybrid energy storage system is achieved. The micro-grid hybrid energy storage system power distribution method regulates the time constant of a low pass filter according to a charge state of an energy storage unit, dynamically regulates charging and discharging power of the energy storage unit, enables the charge state of the energy storage unit to be kept in a certain range, avoids overcharging and over-discharging of the energy storage unit and facilitates power balance of the micro-grid hybrid energy storage system.

The invention relates to power balance control for a multi-motor dragging system, in particular to a power balance control method of a frequency converter multi-motor dragging system for a belt conveying system and a test device. The control method comprises the following steps of: arranging a main frequency converter, and adjusting the torque of a frequency converter in rigid connection with the main frequency converter to be consistent with that of the main frequency converter; and adjusting the rotating speed of a frequency converter in flexible connection with the main frequency converter to be consistent with that of the main frequency converter. The test device comprises a plurality of motors and frequency converters and also comprises coaxial rigid dragging parts formed between every two motors and heteroaxial flexible dragging parts formed between the coaxial rigid dragging parts and other motors; the output ends of the motors are connected with torque rotating speed sensors; and the output end of the test device is connected with a load. By using the control method, the power of the multi-motor dragging system can be enabled to be balanced, and the test device is used for testing.

The invention discloses an optimal dispatching method for a multi-energy complementary power generation system. According to the method, when a wind and light power generation system and a water suction energy storage power station are switched in a large power grid for operation, a coordinated dispatching method is applied, and the coordination problem between the power grid loss generated when the wind and light power generation system and the water suction energy storage power station are switched in the large power grid and the economic optimal object of a complementary system is solved. Moreover, the absorptive problem of wind and light power generation is further considered, a coordinated dispatching strategy is provided, and the method is used for carrying out system optimization onthe overall system containing the wind and light power generation system and the water suction energy storage power station. Therefore, a flexible, safe and reliable technology can be provided amongthe interior of the wind and light power generation system, the wind and light power generation system and the water suction energy storage power station and between the complementary system and the large power grid by using a particle swarm intelligence algorithm, flexible economic dispatching is realized, and the stability of the complementary system is guaranteed.

The invention discloses a control strategy for restraining circulating currents of three-phase four-leg inverters on the basis of third-harmonic injection, and provides a method for restraining circulating currents of three-phase four-leg inverters on the basis of third-harmonic injection. The method includes that three-phase current reference signals outputted by voltage loops are synthesized into a zero-sequence current reference signal (4) on the basis (1) of parallel-connection voltage and current double-loop control of the three-phase four-leg inverters for a parallel-connection topology of two three-phase four-leg inverter modules (2) and (3), and error amplifiers track the zero-sequence current reference signal for a mid-line inductive current in a fourth leg of each module, so that mid-line currents of the two three-phase four-leg inverters are shared, and purposes of restraining the circulating currents of the mid-line currents, protecting power tubes and improving the efficiency of each inverter are achieved; and output signals of current loops of the two modules are synthesized to form two third-harmonic signals (5), the two third-harmonic signals (5) are added to obtain a sum (6), an average value (7) of the sum is used as a common third-harmonic signal (8) for being injected into three-phase and mid-line modulation signals of the two inverter modules, zero-sequence modulation components in the third-harmonic signals are eliminated, and the instantaneous zero-sequence circulating currents caused by factors such as inconsistency of parameters of a main circuit filter and inconsistency of switching time of switching tubes are restrained. The method has the outstanding advantages that the circulating currents of the mid-line currents are effectively restrained; control loops are simple; and third-harmonic injection of the parallel-connection inverters is unaffected, and the direct-current voltage utilization rate is increased.

The invention discloses an alternating current / direct current distribution network distributed optimization method considering wind power uncertainty. Based on the natural partitioning properties of an alternating current / direct current distribution network, a typical alternating current / direct current hybrid distribution network structure and distributed optimization framework are established. Within each alternating current / direct current power grid sub-region, the 1-norm and the infinity-norm are considered at the same time to constrain the probability distribution of each wind power outputscene, and a data-driven two-stage distribution robust model is established. The model uses the electricity purchasing cost of a superior power grid, the electricity purchasing and selling cost of alternating current / direct current sub-regions, the wind abandonment cost, the power generation cost of a micro-turbine and the like as optimization goals, and uses the 1-norm and the infinity-norm to constrain the uncertainty of the probability distribution of the screened typical scene. The data-driven two-stage distribution robust model is established, and column and constraint generation algorithms are used to solve.

The invention brings forward a power balancing control method of cascaded photovoltaic grid-connected inverter on the partial shadow condition. The method comprises the following steps: (1), carrying out independent maximum power point tracking (MPPT) controlling on H bridges of all cascade units to obtain all-stage direct-current voltage instruction values and then carrying out PI controlling on a general direct-current voltage to obtain a grid-connected current instruction value; (2), carrying out quasi-proportional resonant (PR) control of the grid-connected current and grid voltage feedforward control so as to obtain initial duty ratio values of the H bridges; (3) carrying out per-unit processing on actual values of the direct-current side voltages of the cascade units according to the respective direct-current side voltage instruction values of all the cascade units, carrying out comparison with 1 and carrying out PI controlling so as to obtain active correction values of the duty ratios of the H bridges, and realizing power balancing control based on the duty ratio correction. According to the control method, floating control of the grid-connected current can be realized; and power balancing of all power units of the cascade inverter can be maintained. The provided control method has advantages of clear conception, simple control structure, and easy engineering realization and the like.

A logic unit confronting differential power analysis relates to the technical field of IC card safety and special device encryption. One output end with 01 output of a first power balance module of the invention and a random signal sel are connected to the input end of a first AND gate, and the other output end with 01n output of the first power balance module and the random signal sel are connected to the input end of a second AND gate; one output end with 01 output of a second power balance module and a random signal nsel are connected to the input end of a third AND gate, and the other output end with 01n output of the second power balance module and the random signal nsel are connected to the input end of a fourth AND gate. The output ends of the first and the fourth AND gates are connected to one outport OUT of the logic unit via a first OR gate, and the output ends of the second and the third AND gate are connected to the other output port OUTN of the logic unit. The two power balance modules and the four AND gates have constant power consumption, and the output ports of the logic unit has statistically balanced power consumption. Compared with the prior art, the invention realizes the power balance of the unit interior and the output and effectively avoids burrs.

The invention provides a decomposition-coordination optimization method based on multi-microgrids merging into a power distribution network. The decomposition-coordination optimization method is applied when the microgrids are merged into the power distribution network for operation, solves the coordination problem between power distribution network reconfiguration optimization and microgrid economic dispatching optimization goals, provides flexible and bidirectional information interaction platform and technology for the internal of each microgrid, among the microgrids and between the microgrids and the power distribution network, achieves flexible economic dispatching, and ensures safety operation of power grids.

The invention discloses a CCHP (combined cooling, heating and power) system coordinated scheduling method under an active power distribution network environment. The coordinated scheduling method is applied when a CCHP system is accessed to the active power distribution network and operates to solve the coordination problem between power distribution network reconstruction optimization and CCHP system economical optimization targets. The coordinated scheduling strategy is used for carrying out system optimization on the whole system comprising CCHP system subsystems. Therefore, through the artificial intelligence technology, the method can provide flexible, safe and reliable techniques for the inner portion of each CCHP system, between the CCHP systems and between the CCHP system and the active power distribution network, thereby realizing flexible economical scheduling and ensuring safety operation of a power grid.

The invention comprises a remote monitoring system and a remote monitoring method of a wind-solar complementary power generation system. The remote monitoring system comprises an Android-based mobile client, a Java-based upper computer and a hybrid power generation controller which are interconnected in sequence. The wind-solar complementary power generation system comprises a storage battery, a photovoltaic array and a wind power generator which are connected in parallel to a charging end of the storage battery, and a load connected to a power supply end of the storage battery. The hybrid power generation controller comprises a photovoltaic control module used for controlling an output voltage of the photovoltaic array, a fan control module used for controlling an output voltage of the wind power generator, a dump load and a first relay which are connected in parallel to the charging end of the storage battery, a second relay connected on the load in series, and a single chip microcomputer which is used for acquiring a voltage of the storage battery, the output voltage of the photovoltaic array and the output voltage of the wind power generator for comparison. An output end of the single chip microcomputer is connected with the photovoltaic control module, the fan control module, the first relay and the second relay.

The invention discloses a microgrid system of considering operating characteristics of microsources and a power frequency division control method for the microgrid system. According to the system, load demand power is divided into an ultra-low frequency band, a low-frequency band and a medium-high frequency band, wherein a storage battery pack works on the low-frequency band and the stability of DC bus voltage is maintained by adopting a voltage control mode; a diesel generator set and a new energy power generation system work on the ultra-low frequency band and ultra-low frequency power required by load is output by adopting a current control mode; and a supercapacitor works on the medium-high frequency band to stabilize high-frequency power fluctuation of the load. The invention providesan algorithm for decomposing the power required by the load according to the bands and a secondary distribution method of the ultra-low frequency power. By adopting the system and the control methoddisclosed by the invention, power balance of a source end and a load end of a microgrid can be achieved, the harm of the high-frequency power fluctuation to sensitive microsources, such as storage batteries can also be effectively reduced, the service life of equipment is prolonged and the operation efficiency of the system can be significantly improved.

The invention discloses a battery discharge balancing method. The method includes (1) judging discharge demand; (2) calculating storage battery property; (3) calculating bidirectional DC / DC converterperformance; (4) forming a pairing relation. According to the invention, through calculating the storage battery property and the bidirectional DC / DC converter performance, automatic power balance ofthe battery in the discharge process is realized and balancing effectiveness is ensured.

The invention discloses a novel double-drum balanced driving device and a using method. The device comprises a PLC control system, a slide block mechanism, a carrier roller and a material bearing box, wherein the PLC control system comprises a torque sensor, a rotating speed sensor, a motor, a hydraulic pump and a hydraulic cylinder; the torque sensor and the rotating speed sensor are connected to a drum shaft; the motor is connected to the hydraulic pump, and the hydraulic pump is connected to the hydraulic cylinder; the slide block mechanism is fixed on a fixed rack between the two drums and is driven by the hydraulic cylinder to move up and down; the roller is mounted on a carrier roller groove on the slide block mechanism; the material bearing box is arranged right below the carrier roller between the two drums for loading sundries falling from a carrier roller sweeping conveyor belt. The device disclosed by the invention realizes power balance driven by the double drums, reduces imbalance of abrasion of the two drums, and achieves the purposes of reducing the loss and prolonging the service lives of the drums and the conveyor belt.

The invention discloses a charging station locating and sizing method and device. The method comprises the following steps: establishing a traffic network model for calculating road traffic flow in real time according to traffic network data based on a graph theory method, wherein the traffic network data comprises at least two road nodes, longitude and latitude coordinates of the road nodes, a road node connection relationship and the number of electric vehicles among the road nodes with the connection relationship; establishing a traffic flow space-time transfer model based on the road traffic flow and the environment temperature; and achieving information interaction between the traffic network model and the traffic flow space-time transfer model based on the speed, traffic flow and traffic flow density relationship in the traffic network model and the traffic energy consumption relationship in the traffic flow space-time transfer model, predicting the charging load, and determiningthe installation position and capacity of the charging station according to the charging load. The charging load simulation result is closer to the actual load, the installation position and the required capacity of the charging station are accurately determined according to the charging load, and power supply balance is achieved.

The invention relates to the technical field of motor control, in particular to an extended-range hybrid power control method. The method comprises the steps of determining a plurality of operative rated revolving speed values of an engine and dividing a plurality of range extender target electricity generation power ranges according to the operative rated revolving speed values of the engine; calculating range extender target electricity generation power Pr in real time according to Pbty, Pmot and Pcoun; comparing the range extender target electricity generation power Pr with the range extender target electricity generation power ranges, and determining the range extender target electricity generation power ranges to which the range extender target electricity generation power Pr belongsand the corresponding operative rated revolving speed values of the engine; adjusting the output of an range extender in real time according to the range extender target electricity generation power Pr so as to lead the range extender to operate in rated revolving speed and torque-changing states. By the method, the operative rated revolving speed values of the engine are set, the plurality of range extender target electricity generation power ranges are divided according to the operative rated revolving speed values of the engine to lead the range extender to operate in the rated revolving speed and torque-changing states, the power balance is realized, and the range extender responds quickly.

Embodiments of the present invention provide a method, device and system for transmitting data in a hybrid network. The method includes: determining in the hybrid network the order number N of the highest order multiple-input multiple-output MIMO data and a number M of data types, N being an even number no less than 2, and M being a natural number no less than 2; obtaining, by means of the i-th linear transformation of the i-th data in the M types of data, a number N of i-th output data of equal power, wherein i is a natural number less than or equal to M; outputting the number N of i-th output data of equal power to a number N of physical antennas respectively, so that the received output data are merged and transmitted by each physical antenna. The present invention makes possible the power balance of each radio channel in a hybrid network.

The invention discloses a modular multilevel converter for eliminating low-frequency voltage fluctuation. The low-frequency voltage fluctuation of a sub-module during low-frequency dragging of the modular multilevel converter can be eliminated, sub-modules with corresponding serial numbers in each phase of upper and lower bridge arms are connected with the same DAB power conversion unit, the DAB power conversion unit transmits fluctuation energy in the corresponding module, the power balance of the corresponding sub-modules of the upper and lower bridge arms can be realized, the modular multilevel converter disclosed by the invention can be entirely modularized, thereby being high in reliability and being convenient to maintain and debug; no high-frequency common mode voltage needs to be injected just like the traditional voltage fluctuation control method, therefore the control calculation is simple, and meanwhile, adverse effects to a motor are reduced; and no harmonic circulation component needs to be injected in the bridge arms, thereby reducing the voltage stress and the loss of the bridge arms.

The invention provides a dynamic economic dispatch distributed optimization method and system for a smart power grid, and the method comprises the steps: measuring the frequency of each node, and calculating the Lagrange multiplier deviation; updating the Lagrange multiplier at the current moment based on the consistency algorithm and the Lagrange multiplier deviation corresponding to the generating capacity at the previous moment; and updating the generating capacity and the charging and discharging power in the X update and performing judging, and if the conditions are met, performing Y updating on all nodes. On the basis of a neural network controller, the variable quantity of a Lagrange multiplier is calculated through frequency deviation, so that power balance in a power grid is realized, and a novel thought is provided for realizing power balance constraint in an economic dispatching problem.

The invention discloses a method for enabling a temperature control load to participate in the frequency regulation of a power system. The method comprises installing a controller in the temperature control load, detecting a system frequency fnow through the controller, and when the controller detects that a system frequency deviation exceeds a limit, according to a steady frequency predicted value fpred, taking different control measures and changing the power demand of the load to cooperate with the active power regulation of a power grid. The method can realize power balance quickly by directly removing the load in the case of a large power shortage, and can adjust the load setting temperature in the case of a small power shortage to gradually restore the rated frequency of the system,does not generate under-regulation and over-regulation, and has high control reliability and a good effect.

The invention discloses an internet temperature control system. The internet temperature control system comprises an electric floor heater, an internet temperature controller, a cloud platform and a mobile phone. On the basis of an intelligent temperature controller, remote control is added, the internet temperature control system can be used for behavior energy saving and centralized control, andelectric power and electric quantity balance of single residents, groups and areas can be achieved. A dual relay is used for controlling multiple cables, the indoor temperature is maintained constantly with the lowest power like frequency conversion while interference on a power grid can be avoided. The invention further discloses the electric floor heater, the internet temperature control systemis adopted for control, the usage cost is low, few resources are occupied, and environment friendliness is better achieved.

The invention discloses a inverter station topology structure suitable for high voltage and large capacity traditional HVDC project receiving end transformation and a control method thereof. The inverter station topology can be flexibly applied to the receiving end transformation of HVDC transmission projects with various voltage levels and transmission capacities, so that the voltage and power ofthe inverter can be matched with the original project, and the balance of DC voltage and DC current can be maintained between the inverter units during the steady-state operation of the inverter station. The control mode of the invention is the control mode control of each MMC converter unit, and the power balance between the converter units can be realized without adding an additional controller.

The invention provides a soft start speed regulation motor comprising an output shaft, a clutch, a hydraulic system, a motor shaft, a motor body, a cooling oil distribution disc and a case body. According to the soft start speed regulation motor, complete zero-load starting of the motor in a high-power working condition can be realized. In the starting process, a pressure variation characteristic of the hydraulic system to oil supply of a piston of the clutch is adjusted so that starting time and the starting characteristic of a working machine can be controlled at will. In the working process, a pressure value of the hydraulic system to the oil supply of the clutch is adjusted so that the working machine can work at any speed, and thus energy is saved. Meanwhile, power balance among motors can be realized for a combined driving system of multiple motors so that overload working of single motor can be avoided and the service life of the motor can be prolonged.

The invention provides a soft start gearcase, which comprises a case body, a gear drive assembly, a clutch assembly, a lubricating system, a hydraulic control system and a cooling system, wherein the gear drive assembly and the clutch assembly are arranged inside the case body, the lubricating system and the hydraulic control system are arranged outside the case body, and the cooling system is connected with the case body through an oil pipeline. The soft start gearcase disclosed by the invention can achieve no-load start of a motor under the working condition of high-power transmission and arbitrary control over starting time and starting characteristic; the hydraulic control system and an electric system are effectively combined, therefore the clutch assembly can be accurately controlled and multipoint drive power balance is achieved; a gear drive operating oil pool and an oil tank of the hydraulic system are separated so as to avoid frequent machine halt for replacing hydraulic parts because metal scraps formed by gear meshing enter the hydraulic system; and in addition, due to adoption of an oil tank separation mode, the lubricating oil replacement frequency can be greatly reduced and the equipment operating cost is lowered.

The invention discloses a high-performance ECC coprocessor system resistant to power consumption attack. The system comprises an ECC master controller, a finite field arithmetic unit, a scalar multiplication module, a random number generator and a hash operation module. The ECC master controller controls all the modules to cooperatively complete operation and feeds back state signals to the register set, basic modular operation is completed by calling the finite field operation unit, then data is sent to the scalar multiplication module, and the functions of the point doubling point operation module, secret key scanning, coordinate conversion, y coordinate recovery and power consumption balance are completed. Wherein the random number generator is used for generating random Z coordinates in scalar multiplication operation, and the Hash operation module completes preprocessing of input messages, so that the efficiency of digital signature is improved, and finally encryption and decryption functions and digital signature verification functions are completed. The method has the advantages of being low in space complexity, simple, regular and easy to modularize, has the advantages of performance and area overhead, and meets the application requirements of ECC in the specific field.

The invention discloses a method and apparatus for balancing power among power grid partitions. The method includes the following steps: partitioning a power grid within an object area to obtain a plurality of grid partitions; based on the power supply output power, tie-line power, and load occupancy power of each grid partition, computing the state of output balance of each grid partition; transmitting the redundant output power of grid partitions which are at a rich state in terms of output balance to grid partitions which are at an inadequate state in terms of output balance, thus realizing power balance among grid partitions. Therefore, the method firstly divides the power grid within the object region into a plurality of grid partitions, further computes the state of output balance of each grid partition based on the power supply output power, the tie-line power and the load occupancy power of each grid partition, and transmits the redundant output power of grid partitions which are at a rich state in terms of output balance to grid partitions which are at an inadequate state in terms of output balance, and thus implementing power balance of different grid partitions through the transmission of output power.

The invention discloses a control method of a direct current micro-grid system based on digital energy storage, which comprises the following steps that: when a system is in normal operation, the output power of a PCS1 is a power set value, and the output power of a PCS2 is a difference value between a system power unbalance amount and the power set value; when the direct current load suddenly changes, the output power of the PCS1 is automatically adjusted, and the instant output response power is used for supplying power imbalance caused by the sudden change of the direct current load, so that instant system power balance is realized; an EMS issues a control command to adjust the output power of the PCS2, the output power of the PCS1 automatically recovers to a power set value, and steady-state system power balance is achieved; and the control method also comprises the step that a charging and discharging process of the energy storage system is dynamically controlled according to relevant parameters such as the battery SOC, and bus voltage fluctuation is effectively restrained. By setting a reasonable power response mechanism and a charging and discharging control strategy, power stability and voltage stability of the micro-grid system are realized, and stable operation of the micro-grid is ensured.

The invention discloses a battery management system and method. The battery management system comprises a standby battery module, a plurality of switch modules and a controller, wherein the switch modules are in series connection between the standby battery module and a plurality of battery modules in a battery pack, and the controller is used for detecting the voltage value of the battery modules in the battery pack and controls closing and opening of a specific switch module according to the charging and discharging state of the battery pack in order to connect a corresponding battery module in the battery pack with the standby battery module in parallel. The battery management system is provided with the standby battery module, enables the specific battery module in the battery pack to be charged or discharged according to the charging and discharging state of the battery pack, achieves electric quantity balance of the battery pack in the charging and discharging process, and is simple, reliable and low in cost.

The invention relates to a topological structure of a photovoltaic inverter with wide input and middle-high voltage alternating current output. The invention relates to the technical field of a power system, a high-voltage power grid and a photovoltaic power generation system, the structure comprises a photovoltaic string, a multi-path LLC resonant multi-level half-bridge circuit and a multi-cascade H-bridge half-bridge multi-level circuit, the photovoltaic string is connected with the multi-path LLC resonant multi-level half-bridge circuit, and the multi-cascade H-bridge half-bridge multi-level circuit is connected with the multi-cascade H-bridge half-bridge multi-level circuit. The multi-path LLC resonant multi-level half-bridge circuit is connected with the multi-cascade H-bridge half-bridge multi-level circuit, and the multi-cascade H-bridge half-bridge multi-level circuit is respectively connected with an A phase, a B phase and a C phase. Under the limiting condition of the voltage class of an existing power device, the voltage class of direct-current input and alternating-current output of the photovoltaic inverter can be improved, the power loss on a circuit and a cable line is reduced, and the power generation efficiency of a whole set of photovoltaic system is improved; the number of power devices in the circuit is reduced by half, and the input cost of the power devices of the photovoltaic inverter is reduced.