134results about How to "Avoid frequent movements" patented technology

The invention relates to a double-fed wind-power generation high-voltage through control structure, wherein a control structure of a rotor side virtual resistor is formed by guiding a feedback factor Ra into a current feedback channel of a rotor, stacking a product obtained by multiplying feedback current of a d shaft and a q shaft of the rotor on output of a rotor excitation and torque current regulator in rotor excitation control of a double-fed wind power generation. The double-fed wind-power generation high-voltage through control structure has the advantages of reducing the impaction of current and electromagnetic torque of the rotor of a generator when the voltage of power grid suddenly rises and avoiding frequent operation of a crowbar circuit, wherein the virtual resistor can flexibly change according to suddenly rising extent of the power grid rotor and current rotation speed, and when voltage of the rotor is ensured to be not over than an allowable value of an converter rotor, the oscillation of the current and the electromagnetic torque of the rotor is restrained to a maximum extent, so that the optimal control of the generator is realized when the voltage of the power grid rises suddenly. The invention further relates to a double-fed wind power generator and a double-fed wind power generation system with the double-fed wind-power generation high-voltage through control structure.

The invention relates to a multi-area power system load frequency control method. A power system comprises a plurality of areas interconnected by connecting lines; and each area comprises a conventional generator, a super capacitor, a battery energy storage system and a wind generator. The multi-area power system load frequency control method is characterized by comprising the step of: according to a control interval in which a value of an ACE (Area Control Error) is positioned, enabling output power of a frequency regulating device to be correspondingly regulated, and enabling a system frequency error to be kept in a normal range. Compared with the prior art, according to the multi-area power system load frequency control method disclosed by the invention, different control strategies are adopted according to the control interval of the ACE. The control strategies effectively reduce a system frequency error, improve stability of the power system and reduce cost of power grid construction.

The invention provides a battery control circuit for a double-electrical-energy locomotive, comprising a dc switch, a charger, batteries and isolated conversion units. When an overhead contact system supplies power for traction, the batteries are discharged through the charger and the isolated conversion units; when the batteries supply power for traction, the locomotive is pulled by electrical energy of the batteries through the isolated conversion unit and the dc switch; and when the locomotive is in a regenerative breaking condition, the batteries are charged by feedback braking energy of a traction motor through the charger and the isolated conversion units. The battery control unit provided in the invention can realize battery charge and discharge of the double-electrical-energy locomotive and can utilize breaking energy generated by breakings of the traction motor. The dc switch is not required to be disconnected when the batteries store braking energy, thereby avoiding frequent actions of the dc switch with the applications of electrical breakings, ensuring reliability of the dc switch, and prolonging service life of the dc switch. In addition, the battery control circuit for the double-electrical-energy locomotive of the invention can realize circuit extension and circuit isolation conveniently.

The invention provides a dynamic positioning control method based on UKF (Unscented Kalman Filtering) and constraint model predictive control. The method includes the following steps: obtaining the position and course information of a ship through a sensor; receiving the measured information by a UKF filter, filtering noise interference and wave high frequency oscillation components in the information, and carrying out state estimation for unmeasured states; receiving a low frequency state estimated value of the UKF filter by a model predictive controller and taking the low frequency state estimated value as an initial condition for future dynamic prediction, considering system thruster constraint and operating area constraint online, carrying out optimal solving of a target function, generating an optimal control instruction and transmitting the instruction to the controlled ship, thereby controlling the ship to keep the set position and course. The method avoids frequent movements ofa thruster, reduces wearing and energy consumption of the thruster, improves the control effect and stability of model predictive control, and has high engineering utilization values.

The invention discloses an offline operation control method suitable for a user-side microgrid. Research is carried out on an offline operation mode in the microgrid, a microgrid coordination control strategy of a layered structure is employed, the layered structure comprises a local control layer and a centralized control layer, and the method is applied to coordination control between multiple power sources and loads under multiple operation conditions. According to the invention, under the condition that the quality of electric energy is guaranteed, by full use of the generating advantages of various micro power sources, the micro power sources of multiple types in the user side microgrid can be coordinated and controlled efficiently and reliably so that the requirements of the mcirogrid for energy balance and output are met. The method is simple and practical, the voltage and the frequency inside the microgrid are enabled to be stable, safe operation of important loads is guaranteed, at the same time, the output of a photovoltaic power generation system is fully utilized, and the utilization rate of regenerative energy is improved.

The invention provides a hierarchical distributed photovoltaic access power distribution network voltage control system and method. The system comprises a feed line voltage controller and local voltage controllers. Each local voltage controller is directed to a local photovoltaic power station. The feed line voltage controller is directed to the whole feed line and coordinates and controls each local voltage controller on the feed line. If the local voltage controller cannot solve the local voltage off-limit problem, the local voltage controller uploads the operation state of the local photovoltaic power station to the feed line voltage controller to which the local voltage controller belongs, and the feed line voltage controller calculates the control amount and issues the control instruction according to electrical information uploaded by the local voltage controller. According to the instruction sent by the feed line voltage controller, the local voltage controller calculates the control amount of the local area, and controls reactive power output of a local reactive power compensator and a local photovoltaic inverter, so to achieve voltage off-limit control in the feed line area. The voltage off-limit problem caused by the photovoltaic access is solved, and the power distribution network voltage distribution meets engineering operation requirements.

The invention relates to a primary frequency modulation coordination control system for a full power variable speed pumping storage unit. The system includes a proportional differential regulator module, a filter module, a target active power calculation module and an optimal speed calculation module, wherein the modules are connected in series in the signal flow direction, the proportional differential regulator module calculates an additional active reference value deltaPf of primary frequency modulation of the full power variable speed pumping storage unit, the filter module performs filtering processing of the additional active reference value deltaPf of primary frequency modulation, a low frequency signal deltaPfL and a high frequency signal deltaPfH are separated, a first active reference value 1 and a second active reference value 2 of the full power variable speed pumping storage unit are calculated by the target active calculation module according to the low-frequency signal deltaPfL and the high-frequency signal deltaPfH separated by the filter module, and the optimal running speed of the full power variable speed pumping storage unit is calculated by the optimal speed calculation module according to the first active reference value 1 and transmitted to the full power variable speed pumping storage unit as a speed reference value of a governor of the full power variable speed pumping storage unit.

The invention discloses an all-drive-by-wire electric vehicle chassis coordination control method based on driver characteristics. The method includes the steps of collecting processing driving behavior parameters and vehicle state direct parameters, estimating vehicle state indirect parameters and road environment parameters, distinguishing the personality characteristics for classifying drivers,calculating longitudinal ideal state parameters and transverse ideal state parameters, conducting personality modifying on the ideal state parameters, distributing personality ideal yaw velocities, calculating the torque of wheels according to the personality longitudinal ideal state parameters and the distributed personality ideal yaw velocities, and calculating the rotating angle of the wheelsaccording to personality side slip angle parameters and distributed personality ideal yaw velocities. By means of the method, it is ensured that a longitudinal dynamics system assists a transverse dynamics system in steering when necessary, the vehicle steering safety is improved, the frequent actions of the longitudinal dynamics system at unnecessary moments are avoided, and meanwhile the personality of a chassis dynamics control system is realized.

The invention discloses a coordination control method of a bipolar direct-current microgrid hybrid energy storage system, and belongs to the stable operation field of bipolar direct-current microgrids. The bipolar direct-current microgrid hybrid energy storage system comprises a lithium battery, a first super-capacitor and a second super-capacitor, wherein the lithium battery is connected onto the positive line and the negative line of a bipolar direct-current bus PN through a first bi-directional DC/DC converter; the first super-capacitor is connected onto the positive line and the negative line of a bipolar direct-current bus PO through a second bi-directional DC/DC converter; the second super-capacitor is connected onto the positive line and the negative line of a bipolar direct-current bus ON through a third bi-directional DC/DC converter; and the three bipolar direct-current buses are connected through a voltage balancer. According to the coordination control method, the electric energy quality of the bipolar direct-current microgrid is improved; and frequent actions of the voltage balancer are avoided.

The invention provides a voltage control method and device for a power distribution network provided with a distributed power source. The method includes the following steps that: the main nodes of each sub power distribution area in the power distribution network are obtained; the sensitivity matrix of the voltages of the main nodes and the power of the sub power distribution areas is determined;and a main node voltage allowable interval is determined, and voltage control is performed on the power distribution network provided with the distributed power source. According to the voltage control method and device of the invention, the optimized scheduling means of the distributed power source is provided; the flexible and efficient utilization of the distributed power source can be realized; a voltage quality requirement of the connection of a large-scale distributed power source into the power distribution network can be satisfied; the main nodes are adopted as the objects of voltagecontrol, so that the amount of calculation data on a global layer is decreased, and calculation efficiency can be effectively improved; and the frequent action of a control system can be avoided; andthe voltage control capability of the power distribution network with the distributed power source is improved; and the operational safety of the power distribution network with the distributed powersource is ensured.

The invention discloses a device and a method for switching a stepped capacitor group. By the device and the method, the electric energy quality can be monitored in real time and can be subjected to reactive switching control, meanwhile the device has a fault diagnosis function on the capacitor group and a switching switch, and the reliability of a system is increased. The device consists of an electric energy parameter reading single chip system, a switching control single chip system, a fault diagnosis single chip system and a coordinate control single chip system, wherein the electric parameter reading single chip system consists of a first voltage mutual inductor, a first current mutual inductor, an electric energy metering module, a grid fault state indicating system, a grid fault sound-light alarm system and an electric energy parameter reading single chip; and the fault diagnosis single chip system consists of a second voltage mutual inductor, a second current mutual inductor, a fault diagnosis single chip, auxiliary contacts of the switching switch, a capacitor group fault state indicating system and a capacitor group fault sound-light alarm system. The four single chips form a sub-system with host machine-client machine relation, can finish respective task independently and can also work cooperatively.

The invention provides a method for dynamically setting a gateway reactive power control range under a single-line and single-variable wiring mode. The problem that the dynamic variation of power grid operation characteristics can not be adapted due to the fact that the gateway reactive power control range is fixed in automatic voltage control of a current power grid is solved. The method comprises the specific steps that first, the parameter of a regional power grid circuit, the parameter of a main transformer and the voltage data of an electricity sending end are collected; second, the minimum value of system active power loss of the main transformer under different load rates, the gateway reactive power optimal section, and the corresponding gateway power factor variation range are calculated; at last, the gateway power factor constraints of the transformer in the low load process and in the heavy load process are considered, and the gateway reactive power control ranges under different working conditions are obtained. According to the method for dynamically setting the gateway reactive power control range under the single-line and single-variable wiring mode, the gateway reactive power optimal control range can be dynamically adapted to the variation of power grid load levels, and reactive power balance, energy saving and consumption reduction of the system can be promoted.

The invention relates to an active clearance control method and system. The method comprises the steps that the current state of an aero-engine is judged, and if the aero-engine is in a steady state, a closed-loop control process which is achieved by a closed-loop controller and based on clearance-related parameter adjustment and an actuator affecting turbine clearance is selected and used; if the aero-engine is in a transition state, an open-loop control process which is achieved by an open-loop controller and based on clearance-related parameter adjustment and the actuator is selected and used. According to the method, when the aero-engine is in the steady state, the closed-loop control process based on clearance-related parameters is adopted to ensure high control accuracy of the turbine clearance in the steady state; when the aero-engine is in the transition state, the open-loop control process based on the clearance-related parameters is adopted to make turbine clearance control respond more quickly in the transition state and avoid frequent actuation, caused by slow response, of the actuator affecting the turbine clearance; as a result, high control accuracy of the turbine clearance in the transition state is acquired, and the control effect of active clearance is improved.

The invention discloses a device and a method for demand control of a two-way power supply system. A power flow regulator composed of an isolation transformer, a series-side inverter and a parallel-side inverter is connected in parallel to a spare power automatic switching bus tie switch between two power supply buses powered by a two-way power supply. When the sum of real-time demands of the twopaths in the two-way power supply exceeds a total demand limit value, the power flow regulator transfers the energy of one power supply bus to the other power supply bus. Thus, the sum of the total demand of the system, namely, the demand of a user metering point, is reduced, the basic electric charge is reduced, and the electric energy demand of the load can be ensured to be met. Various problemsfaced by other demand controllers in the current market can be solved, for example, the load stability is affected due to the fact that the demand is reduced by reducing the load power. The control difficulty and the equipment maintenance amount are reduced, the service life of the equipment is prolonged, and the economic benefit is very good.

The invention discloses a valve management optimization method based on steam distribution mode switchover for a 200MW heat supply unit. The invention relates to a switchover method, and specifically relates to a valve management optimization method based on steam distribution mode switchover for a 200MW heat supply unit. The invention aims at solving the problem that the influence of deflection of the optimal valve site due to the change of a steam extraction flow is not considered in the present steam distribution optimization scheme for a 200MW heat supply unit, that is, the same steam distribution optimization curve is adopted under different steam extraction flows, so that the efficiency of a high-pressure cylinder of a steam turbine cannot achieve the optimal value. The method disclosed by the invention comprises the following specific steps: setting two steam distribution modes according to the actual condition of power plant equipment; carrying out load-up and load-down experiments on the heat supply unit to obtain related experiment data, and calculating the efficiency of a high-pressure cylinder of the unit under the different steam distribution modes; obtaining the switchover boundaries of the steam distribution modes according to the efficiency curves of the high-pressure cylinder under the different steam distribution modes; determining the corresponding steam distribution mode according to the relative flow of main steam; and judging whether the change of the flow of the main steam exceeds a margin or not. The invention belongs to the field of steam turbine power generation.

The invention discloses a device and a method for modulating the frequency of a generator set of the device. According to the device, an isolation cascaded transformer and a cascaded convertor are additionally arranged between a machine end of a generator and a low-voltage side of a boosting transformer of a grid connection point, a shunt-wound convertor is additionally arranged on a low-voltage side of the machine end of the generator or the low-voltage side of the boosting transformer of the grid connection point, the cascaded convertor and the shunt-wound convertor are connected together through a public bus, and the cascaded convertor is used for dynamically regulating a cascading compensation output voltage according to the real-time response of technical requirements on the frequencymodulation of the generator set so as to realize the active power regulation of the frequency modulation requirements; and the shunt-wound convertor is used for stabilizing a direct current bus voltage and timely responding to reactive power control requirements of a system. The device has the advantages that various problems during the frequency modulation of the generator set at present can besolved, the comprehensive response speed is high, the modulation precision is high, the device has good coordination control capability with an existing automatic generation control AGC system, the equipment maintenance amount is reduced, the service life of a machine set is prolonged, and the device has very good economic benefits.

The invention relates to a reactive voltage optimization control method and system for a 10kV power supply area, and the method comprises the steps: obtaining the power grid data of all nodes in a power supply area, and calculating the three-phase unbalance degree according to the power grid data; if the three-phase unbalance degree is less than or equal to 2%, determining a node of which the voltage is out of limit according to the power grid data; respectively calculating the voltage sensitivity of each voltage out-of-limit node to each regulation and control unit in the power supply area, and determining the regulation and control unit according to the voltage sensitivity; establishing a regulation and control model; and solving the regulation and control model by adopting a hybrid intelligent algorithm, and outputting a control instruction for the reactive voltage to a regulation and control unit. According to the scheme provided by the invention, the voltage regulation and control effect of distributed photovoltaic is exerted, the combination of hour-level static reactive power optimization and real-time dynamic reactive power optimization of the power distribution network is realized, the voltage of each node of the 10kV power distribution network can be effectively controlled, the voltage fluctuation amplitude is reduced, the frequent action of equipment is avoided, and the economy is considered while the safety is ensured.

The invention relates to optimization on the steam distribution mode of a steam turbine, in particular to a method of optimizing the steam distribution mode of a steam turbine under the effect of backpressure, and aims to solve the problem that: since the effect of backpressure is not considered in the existing steam distribution optimization scheme, namely, same steam distribution optimization curves are used in different seasons and at different times in a day, the efficiency of the steam turbine cannot be optimal. The method includes: 1, determining steam distribution optimization curves under certain backpressure by testing; 2, determining steam distribution optimization curves under adjacent backpressures by testing; 3, constructing a steam distribution mode changeover interface; 4, determining a corresponding steam distribution mode according relative power or backpressure; and 5, judging whether changes exceed allowance or not and changing the steam distribution modes when the relative power or backpressure changes. The method is applicable to the field of steam turbine steam-distribution.

The invention discloses an intelligent control method and system of a cantilever type rescue fire truck in a narrow and small region. According to the intelligent control method, through demarcating of the position needing rescue and sensing of the space around the rescue fire truck, the stretching path of a cantilever is made, and the spreading range of support legs is rapidly determined; if theexisting space around a chassis cannot meet rescue requirements, an appropriate parking position is marked out, and an operator is assisted in conducting corresponding correction according to the marked parking position. The intelligent control method greatly saves the rescue time of the cantilever type rescue vehicle, avoids the situation that due to limitation of chassis space, the spreading ranges of the left and right support legs or the position of the chassis are frequently changed, greatly shortens the rescue preparing time and improves efficiency and avoids personal and property loss.The intelligent control method and system are suitable for cantilever type rescue fire trucks in the narrow and small regions.

The invention provides a nuclear power plant heating system and a heating method thereof. The heating system comprises a condenser, a heating loop, a steam generator, a steam turbine, a steam-water separation reheater which are connected in sequence and a heating loop connected to the outlet of the steam-water separation reheater, wherein the steam turbine comprises a high-pressure cylinder, a medium-pressure cylinder and at least two low-pressure cylinders; the heating loop is used for heating the condensed water generated by the condenser for multiple times, the steam generator is used for heating the heated condensed water into saturated steam, and a part of saturated steam enters the high-pressure cylinder and expands and works; the steam-water separation reheater is used for removingwater in exhausted steam discharged after working, and heating the exhausted steam into superheated steam; and a part of superheated steam enters the middle-pressure cylinder and the low-pressure cylinder to expand and do work, and the other part of superheated steam enters the heating loop to heat the heating water and is supplied to the user. According to the nuclear power plant heating system and the heating method thereof, the environmental pollution problem caused by heating of a thermal power plant can be avoided, and the nuclear power plant heating system and the heating method have thegood technical effect.

The invention discloses a multi-level power circuit control method and device. The method comprises the steps of: A, structuring a switching function s=kx1+x2 by a controller on the basis of a load-side voltage in a power circuit; B, carrying out buffer control on the switching function s by the controller; C, obtaining a switching inequation by the controller by using the switching function s subjected to the buffer control and a convergence condition of a control system, and carrying out logic judgment on the basis of the switching inequation to obtain the control law of a switching function ux; and D, determining the number of working power units in the power circuit by the controller on the basis of the position of a differential value between the voltage us of a power grid connected with the power circuit and an ideal power grid voltage d, in the control law of the ux. The device comprises a function structuring module, a buffer control module, a logic judgment module and a circuit control module. The method and the device, provided by the invention, not only can lower the switching frequency of the power circuit but also can optimize output waveforms.

The invention discloses a comprehensive controller and control method for a sunlight greenhouse electric film rolling machine. The comprehensive controller comprises an automatic control unit, a remote control unit, a manual operation unit and an interlock linkage protection unit. The automatic control unit partially adopts digital tube display, conducts parameter setting in combination with keys and detects an open ventilating opening and a closed ventilating opening according to a temperature and humidity sensor. The remote control unit adopts a coded wireless remote control module. The manual operation unit adopts a double-knife three-gear switch and can achieve film rolling, film releasing and operation stopping. The interlock linkage protection unit guarantees that only one control mode acts for a system at any moment, and other two unit circuits are cut off automatically. By means of the automatic control mode, production and management experience of users is fully considered, and the temperature parameter and the time parameter can be set, so that reasonability and scientificity of rolled film ventilation are improved; the remote control mode and the manual operation mode are added, more choices are provided for the users, and personalized requirements in different seasons and different crop growth stages of the users are met.

The invention disclose a setting calculation method for a bus differential protection current loop line disconnection alarm fixed value, which solves the problem that the current loop line disconnection alarm signal of the transformer substation bus protection frequently happens due to the fact that the current transformer substation bus differential protection current loop line disconnection alarm fixed value is not reasonable. The setting calculation method comprises steps of establishing an imbalance current calculation model of a power transmission circuit according to the usage tower types, the lead phase sequence arrangement and the line length of all power transmission circuits which are connected to one bus of the transformer substation, calculating the positive sequence current, the negative sequence current and the zero sequence current of each loop of the power transmission circuit and the imbalance degree of the zero sequence current, performing actual measurement on the secondary zero sequence imbalance current of all power transmission lines after the transformer substation is in operation, and performing adjustment on the bus protection current loop line disconnection alarm fixed value according to whether the degree of imbalance of the zero sequence current is not greater than 5%. The setting calculation method overcomes the frequent actions of the bus protection current loop line disconnection alarm signal of the transformer station, and guarantees the safety operation of the power grid.