435 results about "Pumped-storage hydroelectricity" patented technology

The invention relates to a control method of low-speed stage starting of static frequency conversion starting of a pumped storage power station, comprising the following steps: calculating the initial position of a rotor; estimating each force commutation moment of a low-speed stage inverting bridge according to a preset constant acceleration value; electrifying an appointed two-phase winding at the unlocking moment of a frequency converter according to an interval to which the initial position of the rotor belongs; switching a rectifier bridge to an inversion run mode at the forced commutation moment, sending a trigger pulse to a thyristor bridge arm corresponding to the appointed two-phase winding according to an interval to which a rotor position angle belongs at the moment after a loop of a frequency converter is cut out and each bridge arm of the inverting bridge is reliably shut off, and simultaneously switching the rectifier bridge to a rectifying run mode, and ending single forced commutation; ending the low-speed run stage if the rotor speed is higher than or equal to 5 percent of specific speed of a machine set, and then switching to a natural commutation stage based on machine terminal voltage, or carrying out the forced commutation again; and if starting exceeds time, regulating the preset constant acceleration value, and then restarting until successful starting. The invention can realize rapid and reliable frequency conversion starting at the low-speed stage of the machine set of the pumped storage power station as long as a set value of the constant acceleration of machine set starting is regulated.

The invention relates to a main transformer differential protection CT polarity check method of a pumped storage power station. In the invention, an applied power method is adopted to solve the problem that the main transformer differential, bus differential and high-voltage cable differential protection CT polarity cannot be checked during the inversed electrification of a main transformer before the machine set of the power station is started, thereby the safety and reliability of the system and the inversed electrification of the main transformer are ensured. The method has the advantages that the operation and the using condition are simple, the used test instrument equipment can be used repeatedly, the water debugging straight-line period of the machine set is not occupied, the temporary high-voltage cable investment is saved, and the commissioning cost is reduced; therefore, the method has favorable popularization and application prospect.

The invention relates to a small-sized mixed-flow pump turbine for a low water head pumped storage power station. The small-sized mixed-flow pump turbine for the low water head pumped storage power station is characterized in that the wrap angle of runner blades is 105-124 degrees, the included angle between the water inlet edge of each runner blade and the water outlet edge of the runner blade is 54-86 degrees, each runner blade is a three-dimensional distorted curved face, the thicknesses are equal in the perpendicular spine direction, the profile of each runner blade is crescent, the ratio value of the thickness of each runner blade to the height B1, existing under the working conditions of the turbine, of an inlet of each runner blade is 0.06-0.11, the height B1, existing under the working conditions of the turbine, of an inlet of each runner blade is equal to the height B2 of each guide vane, a wing of each guide vane is of a symmetrical whale shape, the upper canopy of each guide vane is provided with three pressure-relief vents which are evenly distributed, the axial section of a volute is round, a draft tube is of an elbow shape, and the axial section of the horizontal and straight section of the draft tube is round. By the adoption of the small-sized mixed-flow pump turbine for the low water head pumped storage power station, the water pump pumping working condition and the turbine electricity generation working condition which are opposite in directions of water flow pumped for two times, and the water turbine can efficiently operate under the two operation working conditions.

The invention discloses a method for judging a main low-frequency vibration noise source of a pumped storage power station ground. Considering basic characteristics of noise of a pumped storage power station and on the basis of analyzing a possible noise source, the background values and the noise values of the sound level A before and after unit operation and the background value and the noise value of an octave band sound pressure level are measured in an underground power house, emphasis is given to the analysis of the spectral characteristics, the background values and the noise values before and after unit operation are measured inside and outside a typical peak resident house and the field ground in a splattering mode, after the spectral characteristics of the background values and the noise values are fully compared, the noise 1/3 octave vibration acceleration level is measured, the attenuation law of noise vibration spreading and the correlation degree of possible noise sources are analyzed, and the judgment about whether the possible noise sources are main noise sources is made finally. The method solves the problem that in a traditional method, the large noise source deeply buried in an underground cave is hard to actually observe.

The invention provides a scheduling method for a pumped storage power station to participate in an electric power system with wind power. First, the installed capacity of the pumped storage power station is classified, schemes are screened to obtain feasible schemes, and current scheduling models for the pumped storage power station to participate in the electric power system with wind power are established according to different feasible schemes; then, the models are solved to obtain operating points of a peak-load regulation unit of the pumped storage power station, unit combination and operating points of a thermal power unit and operating costs and air abandon volumes of the system in different feasible schemes; the air abandon volumes of the electric power system with wind power in all the feasible schemes are compared, and if the air abandon volumes are not consistent, the scheme with the smallest air abandon volume is selected as the optimum scheme; or else, the total positive spinning reserves and the total negative spinning reserves provided by the system in different periods are calculated according to the result, the expected value of electric quantity deficiency of the system is calculated with a Monte Carlo simulation method so as to obtain the power shortage cost, finally, the total costs of all the feasible schemes are compared, and the feasible scheme with the smallest total cost is selected as the optimum classification scheme.

The invention discloses an optimization method for improving safety and stability of grid frequency. The optimization method comprises the following steps of: determining a grid size, grid characteristics, an operation mode and a setting condition of a safety and stability control device of a target power system; determining whether the risk that the grid frequency is out of limit exists after a grid fails; implementing a measure for cutting off a pumped storage power station unit; determining a control measure for power of a speed-up or speed-down direct current line; and selecting starting frequency of the power of the speed-up or speed-down direct current line and determining speed-up or speed-down regulating quantity for power of the direct current line through simulating calculation. According to the optimization method, the frequency stability of the grid after failure is improved by using the control measure for the direct current line and a pumped storage power station, the direct current adjustable capacity and the pumped storage power station in the system can be effectively utilized, the frequency maintenance level of the system after failure is improved, the safety and stability control measures such as cut-off of a power set and load shedding are reduced, and the influence of the failure of the power system on power operation, industrial production and life of people is reduced.

The invention provides a method for constructing a total characteristic curve of a pump turbine. By the adoption of a mathematical manipulation method and with the combination of mathematical statistic knowledge, the total characteristic curve at any specific speed is obtained according to existing total characteristic data with the specific speed which is the characteristic parameter of the pump turbine as a standard interpolation. The premise of construction of the total characteristic curve includes the steps of collecting a set of data containing total characteristic curves at different specific speeds, and finally achieving construction of the total characteristic curve at any specific speed according to rule research, mathematical manipulation and mathematical statistic analysis of the collected data and by means of a four-dimensional interpolation method. The method is suitable for early-stage design of a pumped storage station and particularly suitable for early-stage adjustment assurance design of the pumped storage station when total characteristic data of the pump turbine are lacked.

The invention discloses a power generation planning method for a power system with a pumped storage power station. The power generation planning method is characterized by comprising the following steps: firstly, making a repairing plan, and acquiring a load curve of the power system; secondly, under constraint conditions of load balance, set stressing and climbing limits, system spinning reserve and pumped storage power station capacity, establishing a model with the minimum sum of the power generating cost and the start-stop cost of all thermal power generating sets within a scheduling period as an objective; finally, solving according to a basic particle swarm algorithm under chaos control. By the power generation planning method, the problems that during calculation of a power generation planning model of the power system, convergence is poor and local optimum easily appears are effectively solved, so that a more reasonable power generation plan of the power system can be made.

The invention relates to the technology of large volume electric power energy storage, in particular to a virtual pumping energy storage power station and an energy storage generating method based on air compressing energy storage. A high pressure air storage unit is used as an energy storage element to be connected with an air water energy exchange unit. The air water energy exchange unit is respectively connected with a high pressure water pool and a low pressure water pool, wherein the high pressure water pool and the low pressure water pool are provided with stable pressure differences, and a pumping storing generating unit is respectively connected with the high pressure water pool and the low pressure water pool. When power is generated, the air water energy exchange unit utilizes expansion of high pressure gas to act to send water from the low pressure water pool to the high pressure water pool, and utilizes the water pressure difference of the two water pools to drive the pumping storage generating unit to generate power. When energy is stored, the pumping storage generating unit utilizes electric power of power grid to send water from the low pressure water pool to the high pressure water pool, the air water energy exchange unit utilizes the water pressure difference to act to compress air, the air is enabled to be highly-pressured and is sent into a high-pressure air storage unit. The virtual pumping energy storage power station and the energy storage generating method based on the air compressing energy storage adopt mature pumping an energy storage technology to achieve air compressing energy storage and control of power generating.

The invention discloses a multi-target dynamic scheduling method for a wind storage hydrothermal power system based on multi-source complementation, and the method comprises the following steps: 1, building a multi-target dynamic economical scheduling model: 1.1, building four optimization targets: take the minimum thermal power coal consumption, the minimum thermal power output adjustment volume, the maximum thermal power generation and the minimum load fluctuation after the thermal power is inputted to a power grid; 1.2, determining the constraint conditions of the four optimization targets; 2, carrying out the weighting and conversion of the four optimization targets, and obtaining a target function F of the multi-target dynamic economical scheduling model; 3, combining with the target function F, and solving the multi-target dynamic economical scheduling model through employing the improved plant growth simulation algorithm. According to the invention, the method gives full consideration to the economical performance and stability of thermal power operation, the utilization rate of the wind power and hydropower and the adjustment effect of a pumped storage power station, and guarantees the economical performance and stability of operation of the thermal power generating unit while promoting the consumption of the wind power.

The invention relates to a pumped storage power station characteristic accurate simulation method for optimized operation of a wind power contained power grid system. The pumped storage power station characteristic accurate simulation method comprises the steps of: modeling a wind curtailment state of the wind power contained power grid system into a wind curtailment state linear function related to a binary variable; modeling relevant operating states of all pumped storage power stations in the system into a power station operating state linear function related to the binary variable on the basis of the binary variable; constraining the system through the combination of the two linear functions; and simulating output states of the pumped storage power stations when the system is in the wind curtailment state. The pumped storage power station characteristic accurate simulation method has the beneficial effects of conducting linear modeling on the situation that power generation by releasing water is forbidden by the pumped storage power stations when the system is in the wind curtailment state so that a model made by a power grid annual operating plan accurately considering pumped storage power station characteristics is still a mixed integer programming model, ensuring solving efficiency of the mode, being more inline with the actual power system dispatching condition and the actual operation conditions of the pumped storage power stations, and being capable of providing most intuitive judgment basis for dispatchers through calculation results.

Disclosed is a small-sized switched reluctance motor converter system. The system is composed of four alternating main circuits in two sets, an output circuit, a first subsidiary circuit and a secondsubsidiary circuit; the four main circuits alternately output direct current to the output circuit for direct rectify output, and the inversion link is omitted; the first subsidiary circuit can work in both directions, has the three main functions of charging a storage battery, strengthening the excitation and feeding energy backwards, and is flexible and adjustable; the second subsidiary circuitassists in achieving the three main functions and can achieve short-time double-fed power generation control work; a converter can be completely adopted as a motor during running; the system is simplein structure, diversified in function and suitable for complex four-quadrant running fields of small-sized speed-variable wind power, water pumping and energy storage power station integrated motor systems, integration micro-power grids and the like.

The invention discloses a method for determining capacity of a pumped storage power station. The method comprises the following steps: calculating load prediction data in preset time according to historical load data, calculating the wind-electricity power prediction data according to historical wind-electricity power data, and calculating call wire power prediction data according to historical call wire power data; determining the boundary conditions; calculating the equivalent load prediction data on the day according to the load prediction data on the hth day in the preset time, the wind-electricity power prediction data and the call wire power prediction data; determining the maximum technical output requirements on the day in the conventional unit; determining the start-up mode on the day in the conventional unit according to the maximum technical output requirements on the day and the unit operation constraints; determining the minimum technical output on the day in the conventional unit according to the start-up mode on the day, and determining the wind curtailment electric quantity at each point on the day according to the minimum technical output on the day and the equivalent load prediction data on the day; and repeating the previous steps, acquiring the wind curtailment electric quantity data on each day throughout the year, and determining the capacity of a pumped storage power station according to the wind curtailment electric quantity data.

The invention discloses a pumped storage power station and wind power plant combination system for power grid peak regulation and an optimized scheduling method thereof. On the basis of the wind power plant output power predicted value and prediction accuracy, the part not exceeding the lower limit of the wind power plant power predicted value is directly connected into a regional power grid and serves as the base load part of the regional power grid; then, a net load curve with the power of directly-grid-connected wind power plants removed is drawn; unstable wind power plant power exceeding the lower limit value of the predicted value is used for pumped storage at the load valley period, power generation is carried out at the net load peak period, and the start-stop condition and output power value of a pumped storage power station at each period are accurately calculated. According to the scheme, threats of wind power plant grid connection to power grid stability are greatly reduced, the peak regulating and valley filling function of the pumped storage power station is fully exerted, and wind curtailment is reduced.

The invention discloses a detection method for disconnection of voltage transformers. Two voltage transformers are applied to generator protection in a pumped-storage power station, and include a first voltage transformer in a power generation direction and a second voltage transformer in a pumping direction. The detection method for disconnection of the voltage transformers comprises the following steps of: collecting voltage signals from the first and second voltage transformers; working out voltages U1AB, U1BC, U1CA, U2AB, U2BC and U2CA; working out voltage amplitude differences of lines of the two voltage transformers [delta]UAB, [delta]UBC and [delta]UCA, and judging whether the voltage transformers are in disconnection. The detection method can be applied to various connection modes at the generator end of the pumped-storage power station, and is simplified in detection on disconnection of the voltage transformers in various connection modes, wide in application range, high in reliability, and convenient to implement general microcomputer protection.

The invention discloses a double-layer bidding optimization method for a pumped storage unit in a day-ahead electric power spot market. The method comprises the steps of firstly randomly generating Wgroups of new quoted prices in a quoted price range; then calling a gurobi optimizer to solve the market clearing model, and optimizing related parameters of the pumped storage unit under the target of minimum total power generation cost of the whole system; and with the goal of obtaining the maximum income of the pumped storage unit in the electric power spot market, optimizing the iterative process through a genetic algorithm until the optimal quotation and capacity optimization result of the pumped storage unit is output. According to the method, reasonable arrangement of the capacity of the pumped storage unit and optimization of resource allocation can be realized, and meanwhile, higher income is obtained, so that the competitiveness of the pumped storage power station in the market is improved.

The invention provides a method for detecting a seeping water source of an underground workshop of a pumped storage power station based on an isotope tracer technique. The method comprises the following steps: according to the overall structures of the underground workshop and an upper reservoir, collecting water samples from a measuring weir of the underground workshop, in-reservoir water, seepage around a dam of the upper reservoir, underground water, a gentle slope and the surrounding of the reservoir; analyzing radon isotopes in the water samples, at the same time, relatively analyzing theconcentration of hydrogen and oxygen isotopes, chloride ions, sulfate ions and nitrate ions in the water samples, wherein detection results of the concentration of the chloride ions, the sulfate ionsand the nitrate ions are up to the time point of half a year; analyzing all the contents in order to more comprehensively evaluate the seeping water source. The principle of fractional distillation of water isotopes is adopted for investigating a water supply source and distinguishing the composition of underground water from different sources in seeping water, which has a critical function in accurately understanding a seepage field of the dam and determining whether a seepage channel around the dame exists.

The invention discloses a method for measuring a pumped storage power station energy production/a motor rotor rotating inertia, which trips off a motor switch and a dynamo magnetic blow-out switch suddenly in a manner of phasing operation to maintain the pressing sate; measures the moderating process of the rotor of the machine set in the pressing state (a turning wheel of a water turbine rotates in pressed air without contacting water body), records time of rotate speed reducing from rated speed to 90% of rated speed; measures the input electric power (active power), the tolerance of a dynamo stator and a rotor, and the winding temperature of the stator and the rotor in the phasing operation of the machine set; calculates iron loss and copper loss of the motor in phasing operation by using the iron loss and copper loss of the stator and the rotor obtained by the experiment of the motor stator, rotor tolerance and motor efficiency; difference value between sum of loss of the two phases to the input electric power of phasing operation of the machine set is the total mechanical consumption of the rotor of the machine set in the moderating process in the pressing state. The total rotation inertia of the machine set can be obtained by total mechanical consumption power and moderating time.

The invention discloses an emergent switchover starting control method from water pumping to power generation of a pump storage group. Under a water pumping condition, after a guide vane is closed to the smallest opening degree and a generator switch GCB is disconnected, a rotary wheel loses the prime power in the water pumping direction, under the condition that the guide vane is not completely closed, water pressure from a pressure steel pipe forces the pump storage group to be braked and decelerated and pass through the zero rotation speed instantly, and then the pump storage group is immediately changed to be in a turbine steering direction and accelerated to the synchronous rotation speed, and grid-connected power generation is realized. The emergent switchover starting control method from water pumping to power generation of the pump storage group has the advantages that the pump storage group is stopped without inputting mechanical brake or electric brake, the work condition switchover time is effectively shortened, emergent response of a pumped storage power station when a power grid is abnormal is more effectively represented, and the safety function of the power grid is guaranteed.

An underwater pumped storage power plant that includes: an accumulator system with pressure vessels fillable with water and; a water outlet for water flow out of the system into a surrounding ocean against hydrostatic water pressure (PT) corresponding to water depth (T); a pump at the water outlet to pump water out of the system by converting electrical energy into potential energy corresponding to a displaced water column PT; a water inlet to allow water flow into the system from the surrounding ocean; a common generator at the water inlet, to convert the potential energy back into electrical energy when water flows in; electric lines to transport the electrical energy from the ocean surface to the power plant and back, wherein the pressure vessels are pressure-resistant and resistant to deformation from the PT at the ocean floor.

The invention provides a mechanical brake control apparatus, method and system of a pumping storage unit. The method comprises the steps of outputting a mechanical brake instruction according to a feedback signal of an electric brake disconnecting link in a water pumping energy storage power station, a feedback signal of a GCB, a feedback signal of a guide vane all-off sensor, a rotary speed signal of a unit, a feedback signal of a guide vane opening feedback sensor, a rotary speed signal measured by a fluted disc speed measurement probe, a first rotary speed threshold value and a second rotary speed threshold value, to enable an electromagnetic valve to act to control the low-pressure gas in a mechanical brake air supply pipeline to enter a lower cavity of the electromagnetic valve through linkage of the electromagnetic valve and to jack the lower cavity, and enabling a brake ring which is fixed below a rotation part of a unit generator motor of the water pumping energy storage power station to be in friction, so as to enable the pumping storage unit of the water pumping energy storage power station to be stopped in a static state. By virtue of addition of the speed regulator, the feedback signal of the guide vane opening feedback sensor and the rotary speed signal measured by the fluted disc speed measurement probe are electrically adjusted and collected to be used as the input mechanical brake conditions, so that reliability of a signal circuit can be improved.

The invention discloses a pumped storage power plant tail water retained rock step blasting safety protection method, and relates to an underwater rock step blasting safety protection method. A bladder curtain and porous stoplog gates are constructed outside a rock step to be blasted; the bladder curtain consists of a plurality of steel pipes; two rows of holes are bored on each steel pipe; and each steel pipe is connected with an air pipe of an air compressor. The porous stoplog gates consist of a steel frame and bamboo rafts; I sections are arranged on both sides of the stoplog gate of eachhole; the two sides of each I section are fixed on round flow splitting support piers through steel plates and expansion bolts; each stoplog gate is in welded connection through channel steel, the I sections and angle bars; a layer of vertical bamboo gangway is spread on the water inlet surfaces of the stoplog gates; and simultaneously safety nets are arranged on the tops of flow splitting support piers on the top and both sides of a single hole stoplog gate. The method adopts the proposal of arranging the bladder curtain plus the steel frame, the bamboo rafts and the safety nets to replace aproposal of the stoplog gate, has scientific and reasonable design, protects a trash rack and a tail gate against the damage and the influence of the blasting, and brings about easy spoil removal, short manufacturing and installation time limits, and low manufacturing, installation and demolition cost.