CN210178504U - Branch line grounding fault positioning system for power distribution network - Google Patents
Branch line grounding fault positioning system for power distribution network Download PDFInfo
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- CN210178504U CN210178504U CN201920929074.1U CN201920929074U CN210178504U CN 210178504 U CN210178504 U CN 210178504U CN 201920929074 U CN201920929074 U CN 201920929074U CN 210178504 U CN210178504 U CN 210178504U
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Abstract
The utility model discloses a distribution network branch line earth fault positioning system. The water-hammer-resistant power generation and supply device belongs to the technical field of power generation and supply, has good reliability, and can reduce the damage of the water hammer effect of the pipeline of the pumped storage power station. The system comprises a power supply network, a plurality of power utilization units connected to the power supply network and a plurality of pumped storage power stations arranged at different positions; the pumped storage power station comprises a reservoir, a water turbine and a pipeline, wherein two ends of the pipeline are respectively connected to a water outlet of the reservoir and a water inlet of the water turbine in a butt joint mode and can guide water in the reservoir to the water turbine; a storage, a grid-connected device and a controller are respectively arranged in the pumped storage power station; the grid-connected device comprises a first transformer, a first voltage sampling circuit, a switch K1, a charger, an energy storage battery pack, a switch K2, an inverter, a filter, a second transformer, a second voltage sampling circuit, a switch K3 and a third voltage sampling circuit which are respectively connected with the controller.
Description
Technical Field
The utility model relates to a power generation and supply technical field especially relates to a distribution network branch line earth fault positioning system.
Background
At present, the pumped storage power station guides water in a reservoir above the pumped storage power station to a hydraulic generator by using a pipeline, and the pipeline is easy to be affected by water attack in the process of pipeline water delivery so as to cause pipeline fracture. In the comprehensive power supply of hydropower, thermal power, wind power or solar power generation and the like, the hydropower generally plays a role in adjusting the sudden change of the power load, and when the load demand suddenly rises, the delivered water quantity needs to be increased immediately so as to increase the generated energy; when the demand drops, the water flow is required to be rapidly slowed down to reduce the generated energy, so that the water flow speed of the pipeline is changed suddenly, and the elasticity of the pipeline is tiny due to the fact that the water is basically incompressible, so that high-pressure waves of the water are transmitted along the pipeline, and a 'water hammer effect' capable of damaging the pipeline is generated on the pipeline.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve the pipeline of current pumped storage power station and be easy not enough that the water hammer effect destroys, provide a good reliability, can reduce a distribution network branch line earth fault positioning system that the pipeline water hammer effect of pumped storage power station destroys.
The technical problem is solved by the following technical scheme:
a power distribution network branch line ground fault positioning system comprises a power supply network, a plurality of power utilization units connected to the power supply network and a plurality of pumped storage power stations arranged at different positions; the pumped storage power station comprises a reservoir, a water turbine and a pipeline, wherein two ends of the pipeline are respectively connected to a water outlet of the reservoir and a water inlet of the water turbine in a butt joint mode and can guide water in the reservoir to the water turbine; a storage, a grid-connected device and a controller are respectively arranged in the pumped storage power station; the grid-connected device comprises a first transformer, a first voltage sampling circuit, a switch K1, a charger, an energy storage battery pack, a switch K2, an inverter, a filter, a second transformer, a second voltage sampling circuit, a switch K3 and a third voltage sampling circuit which are respectively connected with the controller; the input end of the first transformer and the input end of the charger are both connected to the power output end of the pumped storage power station; the output end of the first transformer and the acquisition end of the first voltage sampling circuit are both connected to one end of a switch K1, and the other end of the switch K1 is connected to a power supply network; the charging end of the energy storage battery pack is connected with the output end of the charger, the two ends of the switch K3 are respectively connected with the discharging end of the energy storage battery pack and the input end of the inverter, the output end of the inverter is connected with the input end of the filter, the output end of the filter is connected with the input end of the second transformer, the output end of the second transformer and the sampling end of the second voltage sampling circuit are both connected with one end of the switch K2, and the other end of the switch K2 is connected to the power supply network; the sampling end of the third voltage sampling circuit is connected to the power supply network; the memory is connected with the controller;
the pipeline comprises a first pipe and a second pipe with the diameter larger than that of the first pipe; the lower end of the second pipe is in butt joint with the water inlet of the water turbine, the upper end of the second pipe is integrally in butt joint with the lower port of the first pipe, and the upper port of the first pipe is in butt joint with the water outlet of the reservoir; the pumped storage power station also comprises a pipeline water hammer damage reduction strategy device, and a first side wall hole is formed in the second pipe; the pipeline water hammer damage reduction strategy device comprises a water bin with an opening at the upper end of a bin cavity, a communicating pipe and a water wave eliminating device; two ends of the communicating pipe are respectively connected to a water outlet at the bottom of the water sump and a first side wall hole of the second pipe in a butt joint mode; the water wave eliminating device comprises a plurality of cross rods, two ends of each cross rod are horizontally spaced and fixedly connected to the upper side wall in the bin cavity; a plurality of oscillation eliminating vertical pipes are vertically and downwards arranged on each cross rod, and a plurality of oscillation eliminating side pipe holes are arranged on the side pipe wall of each oscillation eliminating vertical pipe; the first tube forms an included angle theta with the horizontal plane.
When the load demand is low and the water quantity required by the water turbine is low, a large amount of water is stored in the water bin, and the water level in the water bin is high; when the load demand is suddenly increased, the water in the water bin can be utilized to meet the increase of the water turbine to the water quantity, and the water hammer effect that the water flow speed in the pipeline is suddenly changed to cause great damage to the pipeline is avoided. The damage of the water hammer effect of the pipeline of the pumped storage power station can be reduced.
Preferably, an oscillation elimination block with the outer end facing downwards is fixedly arranged on the oscillation elimination vertical pipe above each oscillation elimination side pipe hole.
The utility model discloses can reach following effect:
the utility model discloses the good reliability can reduce the pipeline water hammer effect destruction of pumped storage power station.
Drawings
Fig. 1 is a schematic diagram of a circuit principle connection structure according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a connection structure of a pumped storage power station according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an optimal solution x (t) according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of an optimal solution u (t) according to an embodiment of the present invention.
FIG. 5 is a schematic view of the overlooking enlarged connection structure of the ring plate in the reservoir of the embodiment of the present invention
Fig. 6 is a schematic view of a side-view enlarged connection structure of the pressure plate in the reservoir.
Fig. 7 is a schematic view of a connection structure of the pumped storage power station according to the embodiment of the present invention, in which the water sump is disposed on the second pipe of the pipeline.
Fig. 8 is a schematic diagram of an enlarged connection structure of the oscillation-eliminating vertical pipe of the pumped storage power station according to the embodiment of the present invention.
Fig. 9 is a schematic cross-sectional connection structure diagram of a pipeline water hammer damage reduction strategy device of a pumped storage power station according to an embodiment of the present invention.
Fig. 10 is a schematic view of a cross-sectional connection structure of a water inlet cover in a reservoir according to an embodiment of the present invention.
Fig. 11 is a circuit diagram of an analog signal input conditioning circuit according to an embodiment of the present invention.
Fig. 12 is a circuit diagram of a compound switch according to an embodiment of the present invention.
Fig. 13 is a schematic view of a connection structure of a pumped storage power station according to an embodiment of the present invention when water is present in the pipeline.
Fig. 14 is a schematic view of a connection structure of a pressure adjusting device according to an embodiment of the present invention.
Fig. 15 is that the embodiment of the utility model provides a silt of reservoir bottom surface is still more shallow, and the pressure plate has not pressed on silt yet, a user state connection structure sketch map when vertical pipe No. two has not upwards stretched out.
Fig. 16 is a schematic view of the connection structure of the embodiment of the present invention in a usage state when the sediment on the bottom surface of the reservoir is already higher, the pressure plate presses on the sediment, and the second vertical pipe is already extended upward.
Fig. 17 is a schematic view of a top-down connection structure at a vertical hole of a sealing slider according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
An embodiment, a branch line ground fault location system for a power distribution network is shown with reference to fig. 1-17.
The system comprises an energy storage control monitoring platform 15, a power supply network 14, a plurality of power utilization units 13 connected to the power supply network and a plurality of pumped storage power stations 1 arranged at different positions; the pumped storage power station comprises a reservoir 38, a water turbine 35 and a pipeline 40, wherein the two ends of the pipeline 40 are respectively connected to a water outlet 41 of the reservoir and a water inlet 42 of the water turbine in a butt joint mode and can guide water 98 of the reservoir to the water turbine; a wireless module 16, a stored power control generating efficiency strategy module 17, a memory 18, a grid-connected device 2 and a controller 12 are respectively arranged in the pumped storage power station; the grid-connected device comprises a first transformer 3, a first voltage sampling circuit 4, a switch K1, a charger 5, an energy storage battery pack 6, a switch K2, an inverter 7, a filter 8, a second transformer 9, a second voltage sampling circuit 10, a switch K3 and a third voltage sampling circuit 11 which are respectively connected with a controller; the input end of the first transformer and the input end of the charger are both connected to the power output end of the pumped storage power station; the output end of the first transformer and the acquisition end of the first voltage sampling circuit are both connected to one end of a switch K1, and the other end of the switch K1 is connected to a power supply network; the charging end of the energy storage battery pack is connected with the output end of the charger, the two ends of the switch K3 are respectively connected with the discharging end of the energy storage battery pack and the input end of the inverter, the output end of the inverter is connected with the input end of the filter, the output end of the filter is connected with the input end of the second transformer, the output end of the second transformer and the sampling end of the second voltage sampling circuit are both connected with one end of the switch K2, and the other end of the switch K2 is connected to the power supply network; the sampling end of the third voltage sampling circuit is connected to the power supply network; the power storage control power generation efficiency strategy module, the wireless module and the memory are respectively connected with the controller; the controller is connected with the energy storage control monitoring platform through the wireless module.
The switches K1 and K2 are all composite switches capable of switching at an accurate zero crossing. As shown in fig. 12.
The compound switch comprises a first node 701, a second node 702 and a silicon controlled switch KbMagnetic latching relay switch KcNode MaInductor LaNode MbCapacitor Ca and diode D1Diode D2Diode D3Diode D4Capacitor C0Photoelectric coupler OPT and resistor R0A self-powered power supply module 901, a magnetic drive power circuit 502, a silicon drive circuit 503 and a controller, wherein the photocoupler OPT comprises a light emitting diode D5And a photo transistor Q0(ii) a Silicon controlled switch KbAnd a magnetically held relay switch KcOne end of the first and second switches is respectively connected with a first node, and the thyristor switch KbAnother end of (1), magnetic latching relay switch KcAnother end of (1), inductance LaOne terminal of (1), diode D1Positive terminal of (2) and diode D3Respectively with the node MaConnection, inductance LaAnother terminal of the capacitor Ca, one terminal of the capacitor Ca and the capacitor C0One end of each is connected with the node MbThe other end of the capacitor Ca is connected with a second node, and a diode D2Positive terminal of (2) and diode D4Are all connected to a capacitor C0On the other end of the diode D1And diode D2Are all connected to the light emitting diode D5On the positive terminal of a diode D3Positive terminal of (2) and diode D4Are all connected to the light emitting diode D5On the negative terminal of the triode, a phototriode Q0The emitter of the transistor is grounded, and the phototriode Q0Respectively with a resistor R0Is connected with the controller, the resistor R0The other end of the silicon driving circuit is connected with a self-power-utilization power supply module, and the silicon driving circuit is respectively connected with a silicon controlled switch KbIs connected with the controller, and the magnetic drive circuit is respectively connected with a magnetic latching relay switch KcIs connected with the controller.
When the thyristor switch KbWhen conducting, the magnetic latching relay switch KcMagnetic latching relay switch K at the moment when it is not yet turned offcAlso conducting, i.e. thyristor switch KbAnd magnetic latching relay switch KcAt the same time in the on state. Because of the silicon controlled switch KbThe branch circuit has an inductance LaOn-resistance of, obviously magnetically holding, relay switch KcThe impedance of the branch is far less than that of the thyristor switch KbThe impedance of the branch thus flowing through the magnetically held relay switch KcIs greater than the current flowing through the thyristor switch KbThe current of the branch. If magnetic latching relay switch KcThe contact is not opened at the current zero crossing point, and the contact is easily damaged. The scheme is realized by acquiring the inductance LaCurrent I of the branch1At the accurate time point when the zero crossing point is reached, the controller sends out a control signal to disconnect the magnetic latching relay switch KcContact of (1) making magnetic latching relay switch KcWhen the current is small, the magnetic latching relay switch K is closed or opened, so that the magnetic latching relay switch K is not easy to burn outcUpper contact effectively prolongs the magnetic latching relay switch KcThe service life of the compound switch is further prolonged, the structure is simple, and the reliability is high.
When the transformer is used, the output end of the first transformer and the acquisition end of the first voltage sampling circuit are connected to a first node of a compound switch, and a second node of the compound switch is connected to a power supply network. Similarly, the output end of the second transformer and the sampling end of the second voltage sampling circuit are both connected to the first node of the other combination switch, and the second node of the combination switch is connected to the power supply network. And the power is switched on through zero crossing, so that the damage of the voltage to the power grid is small. The reliability is good.
A part of electricity generated by the pumped storage power station is stored in the energy storage battery pack, and the electricity storage quantity is used for controlling the power generation efficiency, so that the power supply stability of the pumped storage power station is good.
The pumped storage power station also comprises a lower water pool 27, a transfer pool 25, a lower pumping pipe 26 which is provided with a lower pumping pump 23 and can pump water in the lower water pool into the transfer pool, and an upper pumping pipe 24 which is provided with an upper pumping pump 80 and can pump water in the transfer pool into a reservoir; the transfer pool is arranged between the reservoir and the lower water pool; a reservoir water level sensor 81 capable of detecting the water level height of the reservoir is arranged in the reservoir, and a transfer pool water level sensor 82 capable of detecting the water level height of the transfer pool is arranged in the transfer pool; the upper and lower orifices of the lower pumping pipe are respectively arranged on the mouth of the reservoir and in the lower reservoir, and the upper and lower orifices of the upper pumping pipe are respectively arranged on the mouth of the reservoir and in the transit pool; the reservoir water level sensor, the transfer pool water level sensor, the control end of the upper water pump and the control end of the lower water pump are respectively connected with the controller. Water from turbine 35 is directed to the sink by a drain pipe 79.
After the upper water pump and the lower water pump are started, water in the lower water pool can be pumped into the reservoir for recycling. The reservoir water is led via a pipe to a hydraulic turbine 35 of a pumped storage power station.
The pumped storage power station further comprises a display 19 and a voice prompter 20, and the display and the voice prompter are respectively connected with the controller.
The pumped storage power station also comprises an analog signal input conditioning circuit 21 and an electricity utilization adjusting knob 22 which are respectively connected with the controller. As shown in fig. 11.
The pumped storage power station further comprises a water pump abnormity detection method, wherein the water pump abnormity detection method comprises the following steps: the method comprises the following steps that corresponding power utilization gears of a lower water suction pump at different water suction speeds are stored in a memory in advance; during the use, the user will use the electric adjust knob by the minimum gear of power consumption slowly to the biggest gear of power consumption to adjust, analog signal input conditioning circuit detects the pumping speed that every power consumption gear of power consumption adjust knob corresponds, and the controller judges whether the pumping speed that detects the lower suction pump that obtains that every power consumption gear corresponds reaches the normal range of the pumping speed that this power consumption gear corresponds of prestoring. If the pumping speed does not reach the normal range, the fault is judged, the controller controls the display to display the information that the pumping speed of the lower water pump is abnormal, and controls the voice prompter to send out a voice alarm prompt, otherwise, the controller controls the display to output the information that the pumping speed of the lower water pump is normal;
when the water pumping speed of the water pump is abnormal, the lower water pump pumps the same amount of water to consume more electricity, and the lower water pump pumps the water abnormally and needs to be replaced or maintained. The user can be timely reminded when the pumping speed of the lower water pump is abnormal, the detection precision is high, the misjudgment rate and the missing judgment rate are low, and the maintenance efficiency is improved. And in the same way, the abnormal information of the upper water pump can be judged.
The method for realizing the optimal strategy of the stored electricity control power generation efficiency strategy module comprises the following steps:
the power generation efficiency and the stored electricity quantity of the pumped storage power station need to be stabilized within a preset horizontal range so as to meet the continuous power generation function of the pumped storage power station; if the electricity selling quantity can be accurately predicted, the power generation efficiency strategy can be controlled according to the stored electricity quantity:
firstly, obtaining an optimal control function;
recording the power storage quantity at the time t as x (t), and the power generation quantity and the power selling quantity per unit time as u (t) and v (t), respectively, then meeting the requirements
Where v (t) is a known function,
the preset power generation rate and the preset stored power are respectively recorded as u0And x0The power generation rate u (t) and the stored electricity amount x (t) are stabilized as much as possible at u0And x0On the level of (c), a quadratic form objective function is obtained after the control function u (t) is solvedNumber of
A minimum value is reached, where T is any given time,
is a weighting factor that adjusts the degree of importance between u (t) stability and x (t) stability, and applies a dimension with the inverse of time;
in (1) and (2), the stored charge x (T) is a state function, and the stored charge is zero when T is 0 and T is T for the sake of certainty, that is, the end point condition is fixed
x(0)＝0，x(T)＝0 (3)
In addition, there are actually constraints on both the power generation rate and the stored electricity amount, and the constraints are expressed as
0≤u(t)≤um，0≤x(t)≤xm(4)
Solving u (t) under the constraint conditions (1), (3) and (4) to ensure that the general function F of the formula (2) reaches the minimum value;
solving the general function of u (t) into (2) from (1), and writing it as x (t)
If the condition (4) is not considered for the moment, the (3) and the (5) form a general function extreme value problem of an inherent end point, the most significant solution x (t) is obtained by solving with a variable method and then is substituted into the (1), and the optimal control function can be obtained;
then, the control quantity u can be determined according to the state x which is easy to observe;
to simplify the solution process, the electricity sales is set to a known constant, i.e.
v(t)＝v0(6)
Substituting the formula (6) into the formula (5) to obtain the optimal solution x (t) according to the Euler equation
Namely, it is
The solution of equation (7) under endpoint condition (3) is
Substituting (8) into formula (1) to obtain
(8) And (9) an optimal state function and an optimal control function, respectively;
obtained from the two formulas (8) and (9)
Let T → ∞, then for any finite T, the last term at the right end of the above equation approaches zero, and then
The above equation (11) shows that the power generation rate control function u can be directly determined from the state x of the stored electric quantity without involving the time argument t, and that u decreases as x increases, this control manner being called state negative feedback that can determine the control quantity u from the state x that is easy to observe;
finally, obtaining the optimal solution of the original problem of the constraint condition (4);
considering the constraint condition (4), the two expressions (8) and (9) can be re-expressed as a hyperbolic function
The optimal solutions x (t) and u (t) are drawn according to the formulas (12) and (13), and it can be seen from the diagram that as long as x ism≥x0X is more than or equal to 0 and less than or equal to x (t)mI.e., x (t) satisfies condition (4); given the parameter xmAnd x0Naturally there should be xm≥x0On the other hand, because
So long as u (0) is less than or equal to umU (T) is not less than 0, and u (t) is not less than 0mUnder the condition, x (t), u (t) and x (t) given by the two formulas (8) and (9) are also the optimal solution of the original problem considering the constraint condition (4); therefore, the optimal strategy for controlling the power generation efficiency by the stored electricity can be obtained.
The electricity selling quantity can be preset or can be accurately predicted, and the accurate value of the electricity selling quantity prediction can be obtained according to historical electricity selling data.
According to the embodiment, a part of electricity emitted by the pumped storage power station is stored in the energy storage battery pack, and the electricity storage quantity is used for controlling the power generation efficiency, so that the power supply stability of the pumped storage power station is good.
The pipeline comprises a first pipe 37 and a second pipe 36 with the diameter larger than that of the first pipe; the lower end of the second pipe is in butt joint with the water inlet of the water turbine, the upper end of the second pipe is integrally in butt joint with the lower port of the first pipe, and the upper port of the first pipe is in butt joint with the water outlet of the reservoir;
the pumped storage power station also comprises a pipeline water hammer damage reduction strategy device 39, and a first side wall hole 33 is formed in the second pipe; the device for reducing the pipeline water hammer damage strategy comprises a water sump 32 with an opening 44 at the upper end of a sump cavity 43, a communicating pipe 34 and a water wave eliminating device 78; two ends of the communicating pipe are respectively connected to a water outlet at the bottom of the water sump and a first side wall hole of the second pipe in a butt joint mode;
the water wave eliminating device comprises a plurality of cross bars 28 which are horizontally spaced and fixedly connected with the upper side wall in the chamber at two ends; a plurality of oscillation elimination vertical pipes 29 are vertically and downwards arranged on each cross rod, and a plurality of oscillation elimination side pipe holes 31 are arranged on the side pipe wall of each oscillation elimination vertical pipe; the first tube forms an included angle theta with the horizontal plane.
An oscillation elimination block 30 with the outer end facing downwards is fixedly arranged on the oscillation elimination vertical pipe above each oscillation elimination side pipe hole. The oscillation eliminating block has the advantages that water oscillating from bottom to top is pressed into the oscillation eliminating vertical pipe, and the oscillation eliminating effect is good.
The plurality of oscillation elimination side pipe holes on the same oscillation elimination vertical pipe are spirally arranged.
A lower limiting block 83 is fixedly arranged on the inner wall of the water bin above the cross bar, a closed sliding plate 84 capable of sliding up and down in a closed manner is arranged in the water bin above the lower limiting block, a fixed reinforcing rod 86 is arranged in the water bin above the closed sliding plate, and two ends of a spring 85 are respectively and fixedly connected to the lower surface of the fixed reinforcing rod and the upper surface of the closed sliding plate.
A plurality of side holes 97 are also provided along the conduit, the side holes being provided at different heights of the conduit; a pressure regulating device 98 is respectively arranged on each side hole; the pressure regulating device comprises a connecting pipe 87 and a pressure regulating cavity 90, the pressure regulating cavity is vertically arranged, the side wall of the inner cavity of the pressure regulating cavity is a vertical wall, an air vent 96 is arranged on the upper top surface of the pressure regulating cavity, a lower through hole 91 is arranged on the lower bottom surface of the pressure regulating cavity, and a sealing slide block 93 is arranged in the cavity of the pressure regulating cavity in a vertically sealed sliding manner; a lower limiting ring 89 is arranged in the cavity of the pressure regulating cavity below the closed sliding block, an upper ejector rod 95 is arranged in the cavity of the pressure regulating cavity above the closed sliding block, and two ends of a spring 94 are fixedly connected to the lower surface of the upper ejector rod and the upper surface of the closed sliding block respectively; two ends of the connecting pipe are respectively connected to the side hole of the pipeline and the lower through hole of the lower bottom surface of the pressure regulating cavity in a butt joint manner; the connecting pipe is provided with an electromagnetic valve 88 with a control end connected with the controller.
A plurality of vertical holes 92 are provided on the closed slider.
The upper surface of the closed sliding block comprises an inner ring area 205, a middle ring area 203 and an outer ring area 201, and the center of the inner ring area, the center of the middle ring area and the center of the outer ring area coincide with the center of the upper surface of the closed sliding block; the plurality of vertical through holes comprise a plurality of inner ring vertical through holes 206, a plurality of centering ring vertical through holes 204 and a plurality of outer ring vertical through holes 202; the plurality of inner ring vertical through holes are symmetrically arranged in the inner ring area; a plurality of centering ring vertical through holes are symmetrically arranged in the middle ring area; a plurality of outer ring vertical through holes are symmetrically arranged in the outer ring area.
The diameter of the inner ring vertical through hole is larger than that of the middle ring vertical through hole, the diameter of the middle ring vertical through hole is larger than that of the outer ring vertical through hole, and the diameter of the inner ring vertical through hole is smaller than one centimeter.
When water is required to be closed or the power generation of the turbine is required to be reduced, the electromagnetic valve is opened under the control of the controller, and the water hammer effect in the pipeline can be dispersed into each pressure regulating cavity, so that the damage of the water hammer effect of the pipeline of the pumped storage power station is reduced, the damage of the water hammer effect of the pipeline can be greatly reduced due to the symmetrical porous arrangement of the vertical holes, and the reliability is good.
A water depth scale line 207 capable of measuring the water surface height is arranged on the inner wall surface of the reservoir, and a camera 208 capable of observing the water surface height and connected with the controller is arranged on the reservoir at the water depth scale line.
The pumped storage power station is also provided with a wireless directional transceiver 209, a satellite timer 210, a GPS locator 211 and an address encoder 212 which are respectively connected with the controller.
The method for realizing the optimal strategy for reducing the water hammer of the pipeline of the strategy device for reducing the water hammer damage of the pipeline comprises the following steps:
according to Newton's second law of mechanics, the sum of forces acting in the direction of motion of the water flow in the first pipe
Pressure s formed by pressure difference between two ends of first pipe1(m1-m2) + first intraductal water column gravity rho Ls of self1Resistance of pipe wall of pipe G sin theta-I to water flowForce cLy2That is to say have
Wherein rho is the density of water, L is the length of the first pipe, and s1The cross section of the first pipe, y is the water flow speed in the first pipe, m2Is the pressure of water at the water outlet at the lower end of the first pipe, m1The pressure of water at a water inlet at the upper end of the first tube is g, g is a gravity constant, theta is an included angle between the first tube and the horizontal plane, and c is a viscosity coefficient;
y (t) is the water flow velocity at time t in tube I, m2(t) is the pressure of water at the water outlet at the lower end of the first pipe at time t;
the water level of the reservoir is not changed, so the pressure m of water at the water inlet at the upper end of the first pipe is1Is a constant;
the water and the first pipe are not elastic, the resistance of the pipe wall in unit length to water flow is inversely proportional to the square of the water flow speed, and the proportionality constant c is called as a viscosity coefficient;
(II) because the water inlet of the water bin is arranged at the bottom of the bin, the gravity rho s of the water column in the bin0hg creates a difference s between bottom and top pressure1m2-s0m1The statics equation of the sump is
s1m2-s0m1＝ρs0hg (A2)
Wherein h is the height of the water level of the water sump, s0The sectional area of the water sump;
(III) according to the law of conservation of energy, the difference of the water inlet and outlet quantity of the water bin is equal to the change of the water quantity in the bin, namely, the difference has
Wherein s is2The cross section area of the second pipe is w (t), and the water flow speed of the water outlet of the water bin at the time t is w (t);
when the water flow speed w (t) of the water outlet of the water bin is changed, the change rule of the water level h (t) in the water bin is eliminated from the formulas (A1) - (A3)2And y (t), can be given
Wherein h (t) is the water level height of the water sump at time t;
when w (t) is in a steady state w0When there is a slight change in the vicinity, h (t) is also in a steady state h0A change in proximity; in formula (a4), h (t) is defined as h0And w (t) ═ w0，h0And w0Are all constant, get
Wherein m is0Is the atmospheric pressure at the top of the tank,
let w (t) be w0+εw1(t)，h(t)＝h0+εh1(t) (A6)
Wherein ε is small, substituting (A6) into (A4) and omitting the values of ε and ε2Item of (a) can be obtained
Or be recorded as
The initial condition of equation (A8) may be set to
For given various forms w1The expressions (t), (A8) - (A10) are easy to solve, and the general solution of the expression (A8) is
ξ therein0、
Is an arbitrary constant; when in use
Time of flight
Exhibits oscillation, and the oscillation condition represented by the formula (A9) can be represented as
In the actual engineering, s1、s0、L、s2The parameters are limited by various conditions, but s after the construction of the project is finished1、s0、L、s2All parameters are known, the viscosity coefficient c is small, η is not large, and the oscillation with slow attenuation is formed under the condition (A12) because of s0＞s1And L is larger, so k is small, and omega is small, so that the oscillation period of water in the water sump is long, which is undesirable, and therefore, the method for eliminating the oscillation of water in the water sump by arranging the pipeline water hammer damage reduction strategy device in the water sump is the optimal strategy implementation method for pipeline water hammer reduction.
The embodiment reduces the damage of the water attack effect of the pipeline by the strategy device for reducing the water attack damage of the pipeline; when water in the chamber of the water sump oscillates up and down, the oscillation of the water can disappear quickly by the plurality of oscillation elimination vertical pipes with holes, and the reliability is high.
The water outlet of the reservoir is arranged on the bottom surface 41 of the reservoir, a first sealed sliding plate 46 with a plate hole 45 in the middle is arranged on the bottom surface of the reservoir at the water outlet of the reservoir, and the upper port of the first pipe is fixedly connected to the plate hole of the first sealed sliding plate at the bottom of the reservoir in a butt joint and sealed manner; a first vertical pipe 47 is upwards arranged at the plate hole of the first airtight sliding plate at the bottom of the warehouse, and the pipe center line of the first vertical pipe and the hole center line of the plate hole of the first airtight sliding plate at the bottom of the warehouse are both on the same vertical straight line; a second vertical pipe 48 is arranged in the first vertical pipe in a vertically sliding manner, a water inlet cover 73 is fixedly connected to the upper pipe orifice of the second vertical pipe, and an auxiliary hole 68, a vertical cover hole 74 and a plurality of water inlet holes 69 are respectively formed in the upper surface of the water inlet cover; a circular ring plate 51 is fixedly sleeved on the side surface of the water inlet cover, gears 55 are arranged on the upper surface of the circular ring plate along the circumferential surface of the circular ring plate, four horizontal rods 52 are uniformly distributed outwards around the circular ring plate, the outer end of each horizontal rod is fixedly connected with a pressure plate 53, and the two ends of each pressure plate are upwards tilted 54; the upper end of a third vertical pipe 49 is vertically and fixedly connected in the vertical cover hole; a side wall hole 72 is formed in the side pipe wall of the third vertical pipe, and two ends of an inclined pipe 70 are respectively fixedly connected to the auxiliary hole and the side wall hole of the third vertical pipe in a sealing and butt joint mode; the lower end of a first rotating shaft 71 is horizontally and rotatably arranged in the third vertical pipe, a circular ring block 66 is fixedly sleeved on the first rotating shaft above the vertical cover hole, and a ball 67 capable of rolling on the upper surface of the water inlet cover is arranged on the lower surface of the circular ring block; the upper end of a second rotating shaft 75 is fixedly connected to the lower surface of the first rotating shaft, and a helical blade 50 is arranged on the second rotating shaft; the diameter of the second rotating shaft is smaller than that of the first rotating shaft, and the helical blade is positioned below the side wall hole of the third vertical pipe; the lower end of the first rotating shaft is positioned above the side wall hole of the third vertical pipe; a first gear 65 is arranged on the first rotating shaft above the circular ring block, a third rotating shaft 62 is vertically and upwards arranged on the water inlet cover positioned at the right of the first rotating shaft, a fourth rotating shaft 61 is vertically and upwards arranged on the water inlet cover positioned at the right of the third rotating shaft, and a fifth rotating shaft 59 is horizontally arranged towards the right on the water inlet cover positioned at the right of the fourth rotating shaft; a second gear 64 which has a diameter larger than that of the first gear and is meshed with the first gear in a driving way is arranged on the third rotating shaft; a third gear 63 with the diameter smaller than that of the first gear is arranged on the third rotating shaft below the second gear; a fourth gear 76 which has a diameter larger than that of the second gear and is meshed with the third gear in a driving way is arranged on the fourth rotating shaft; a first conical gear 60 is arranged on the fourth rotating shaft positioned below the fourth gear; a first steering gear 77 which is in meshed driving connection with the first conical gear is fixedly arranged at the left end of the fifth rotating shaft; a vertical rotating disc 58 is vertically and fixedly arranged at the right end of the fifth rotating shaft, and a gear 56 which can be meshed with the gear on the circular ring plate in a driving way is arranged on the outer circumferential surface of one half of the vertical rotating disc; the remaining outer circumferential surface of the vertical rotary disk is a smooth circular arc surface 57 which is not in contact with the gear on the circular ring plate.
Let the water inlet of a tub be located the top of reservoir bottom surface silt 99 always, the silt of reservoir bottom surface is difficult for entering into a tub, reduces the destruction of silt to pipeline and hydraulic turbine, and the security is good.
The embodiment has network monitoring, on partly electricity storage to the energy storage group battery that sends the pumped storage power station, and go control generating efficiency with the electric quantity of depositing, thereby make the power supply stability of pumped storage power station good, the reservoir water yield appears and little and lead to the generated energy hour of pumped storage power station, then start the external electricity generation of group battery, thereby make the power supply stability of pumped storage power station good, and can reduce pipeline water hammer effect and destroy, thereby the silt of reservoir bottom surface is difficult for entering into in the pipeline and reduces silt and causes the striking destruction to pipeline inner wall and hydraulic turbine blade. When the load demand is low and the water quantity required by the water turbine is low, a large amount of water is stored in the water bin, and the water level in the water bin is high; when the load demand is suddenly increased, the water in the water bin can be utilized to meet the increase of the water turbine to the water quantity, and the water hammer effect that the water flow speed in the pipeline is suddenly changed to cause great damage to the pipeline is avoided.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and those skilled in the art can make various changes or modifications within the scope of the appended claims.
Claims (2)
1. A power distribution network branch line ground fault positioning system comprises a power supply network, a plurality of power utilization units connected to the power supply network and a plurality of pumped storage power stations arranged at different positions; the pumped storage power station comprises a reservoir, a water turbine and a pipeline, wherein two ends of the pipeline are respectively connected to a water outlet of the reservoir and a water inlet of the water turbine in a butt joint mode and can guide water in the reservoir to the water turbine; the pumped storage power station is characterized in that a storage, a grid-connected device and a controller are respectively arranged in the pumped storage power station; the grid-connected device comprises a first transformer, a first voltage sampling circuit, a switch K1, a charger, an energy storage battery pack, a switch K2, an inverter, a filter, a second transformer, a second voltage sampling circuit, a switch K3 and a third voltage sampling circuit which are respectively connected with the controller; the input end of the first transformer and the input end of the charger are both connected to the power output end of the pumped storage power station; the output end of the first transformer and the acquisition end of the first voltage sampling circuit are both connected to one end of a switch K1, and the other end of the switch K1 is connected to a power supply network; the charging end of the energy storage battery pack is connected with the output end of the charger, the two ends of the switch K3 are respectively connected with the discharging end of the energy storage battery pack and the input end of the inverter, the output end of the inverter is connected with the input end of the filter, the output end of the filter is connected with the input end of the second transformer, the output end of the second transformer and the sampling end of the second voltage sampling circuit are both connected with one end of the switch K2, and the other end of the switch K2 is connected to the power supply network; the sampling end of the third voltage sampling circuit is connected to the power supply network; the memory is connected with the controller;
the pipeline comprises a first pipe and a second pipe with the diameter larger than that of the first pipe; the lower end of the second pipe is in butt joint with the water inlet of the water turbine, the upper end of the second pipe is integrally in butt joint with the lower port of the first pipe, and the upper port of the first pipe is in butt joint with the water outlet of the reservoir; the pumped storage power station also comprises a pipeline water hammer damage reduction strategy device, and a first side wall hole is formed in the second pipe; the pipeline water hammer damage reduction strategy device comprises a water bin with an opening at the upper end of a bin cavity, a communicating pipe and a water wave eliminating device; two ends of the communicating pipe are respectively connected to a water outlet at the bottom of the water sump and a first side wall hole of the second pipe in a butt joint mode; the water wave eliminating device comprises a plurality of cross rods, two ends of each cross rod are horizontally spaced and fixedly connected to the upper side wall in the bin cavity; a plurality of oscillation eliminating vertical pipes are vertically and downwards arranged on each cross rod, and a plurality of oscillation eliminating side pipe holes are arranged on the side pipe wall of each oscillation eliminating vertical pipe; the first tube forms an included angle theta with the horizontal plane.
2. The system of claim 1 wherein a downward facing anti-oscillation block is affixed to the vertical tube above each hole in the side-tube of the anti-oscillation device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920929074.1U CN210178504U (en) | 2019-06-19 | 2019-06-19 | Branch line grounding fault positioning system for power distribution network |
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| CN201920929074.1U CN210178504U (en) | 2019-06-19 | 2019-06-19 | Branch line grounding fault positioning system for power distribution network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242479A (en) * | 2019-06-19 | 2019-09-17 | 浙江中新电力工程建设有限公司自动化分公司 | Power distribution network branch line Earth design system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242479A (en) * | 2019-06-19 | 2019-09-17 | 浙江中新电力工程建设有限公司自动化分公司 | Power distribution network branch line Earth design system |
| CN110242479B (en) * | 2019-06-19 | 2024-02-27 | 浙江中新电力工程建设有限公司自动化分公司 | Distribution network branch line ground fault positioning system |
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