CN1189717A

CN1189717A - Cableway generating method

Info

Publication number: CN1189717A
Application number: CN97101363A
Authority: CN
Inventors: 沈绍荣
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-01-29
Filing date: 1997-01-29
Publication date: 1998-08-05
Anticipated expiration: 2017-01-29
Also published as: CN1048366C

Abstract

A method for generating electricity features that the potential energy generated by the dead weight of the object transmitted along cableway from higher position to lower position is used to generate electricity. Synchronous motor replaces asynchronous one and the exciting current of synchronous motor is automatically controlled. When cableway is driven by dynamo, electric network supplies current to the dynamo. When weight moves along cableway by its dead weight, the dynamo workds in the state of electric generator.

Description

Cableway generating method

The present invention relates to a kind of method with cableway generating.

The ore that the mine produces has and utilizes cableway to transport greatly, because cableway fortune ore deposit is to transfer the weight operation mostly, ore itself has the energy of very big promotion cableway system running, and the drive motors of cableway adopts the alternating current asynchronous wound-rotor motor, therefore, motor is in the regenerative electric power braking state for a long time, and not only the potential energy of ore is wasted, and motor must consume and much be used for anti-tow rope road, stops the electric energy of its too fast running.

Purpose of the present invention is exactly to propose a kind of the utilization by the potential energy of fortune ore to generate electricity, and both can provide electric energy to electric power system, does not consume anti-tow rope road again, i.e. the cableway generating method of the energy during the regenerative electric power braking state is to overcome the shortcoming of prior art.

This cableway generating method that the present invention proposes, its principal character is to replace asynchronous motor with synchronous motor.The synchro generator excitation electric current adopts control automatically.

The automatic control of exciting current adopts phase measuring circuit and single-chip microcomputer to carry out, so that allow they and thyristor excitation power supply match, play automatic adjusting synchronous motor excitation electric current, synchronous motor can be stablized, successfully work in the effect of electronic/generating state.

For sake of convenience, in conjunction with publish National Defense Industry Press in January, 1984 " key wiring diagram at " Fundamentals of Mono-Chip Computers and making " book end that phase measuring circuit that linear integrated circuit practical circuit handbook is the 362nd page and publishing house of Wuhan University publish in May, 1991 is described below:

Replace under the condition of threephase asynchronous as the cableway drive motor with three-phase synchronous motor, during the fortune ore deposit, three-phase synchronous motor just becomes the three-phase synchronous generator operation and generates electricity by way of merging two or more grid systems under action of gravity, and ore potential energy becomes electric energy and returns electrical network.

Synchronous motor is in motoring condition, during normal excitation, and armature supply and line voltage homophase, underexcitation, armature supply lagging voltage phase place and reduce with exciting current, lagging phase is since 0 degree increase.Otherwise, during overexcitation, armature supply phase place leading voltage phase place and increase with exciting current, leading phase increases since 0 degree.When synchronous motor is in generating state, during normal excitation, armature supply and line voltage are anti-phase, underexcitation, armature supply phase lag voltage-phase reduces with exciting current, during overexcitation since 180 degree, armature supply leading voltage phase place reduces with the exciting current increase since 180 degree.

With the voltage of phase measuring circuit measurement synchronization motor and the phase place of electric current, two linear operational amplifiers constitute the zero passage wave detectors, when being input as timing, are output as high level, when being input as when negative, are output as 0 volt.Three XOR gate constitute electronic switch, when two input end signals are identical, are output as 0 volt; When two input end signals when being different, be output as high level.Analog switch, when its control end signal is timing, switch connection, d type flip flop differentiate whether current signal is more leading than voltage signal phase place, when leading, output is " 0 ".When operational amplifier constitutes the secondary active low-pass filter, electric current and voltage-phase differ 180 when spending, and output voltage is 5 volts, and the same phase time of electric current and voltage is output as 0 volt, and electric current and voltage-phase whenever differ 1 and spend, and the output voltage variation is about 27.8 millivolts.Therefore, single-chip microcomputer will judge that synchronous motor is in generating or motoring condition according to the size of low pass filter output voltage, still judge it is overexcitation or underexcitation for " 0 " according to the d type flip flop output for " 1 ", thereby make the monolithic function control thyristor excitation device automatically, make synchronous function realize smooth conversion electronic and generating.

The advantage that the present invention compared with prior art has is that the potential energy converting and energy that can make existing cableway be transported thing becomes electric energy to return electrical network, cuts down the consumption of energy, and increases benefit, and invests little, simple.Function to former cableway has no effect.

Fig. 1 is the synchronous motor polar plot.

Fig. 2 is the synchronous generator polar plot.

Fig. 3 is a system principle diagram.

Polar plot when Fig. 4 is the normal excitation of synchronous motor.

Polar plot when Fig. 5 is the normal excitation of synchronous generator.

Among Fig. 1-5, -line voltage, -armature supply, Main electromotive force, -synthetic electromotive force,

-induced electromotive force,

-resultant flux.A, B, C, N-represent three-phase four-wire power, the M-synchronous motor.

Embodiment

With always-official's cableway is an example, cableway total length 11KM, vertical discrepancy in elevation 681M is divided into the level Four station, drive motors is the JR-116-6 asynchronous motor, power is 95KW.When construction system, replace with synchronous motor, the phase shift plug-in unit of thyristor excitation device takes out need not, replace with SCB-1 type single-chip microcomputer, single-chip microcomputer D/A output receive 72, (the product description electrical schematic diagram of the thyristor excitation device of producing referring to the rectifier factory, Shenyang City on No. 73 lines, down together), as the given signal of phase shift, 75, No. 76 lines are handled through voltage stabilizing and are received 8255 A0 mouth and encourage command signal input single-chip microcomputer as throwing, and it is underexcitation or cross and encourage signal as synchronous motor that 8255 A1 mouth input is received in the output of phase measuring circuit d type flip flop.The analog quantity input of the output of low pass filter being received the 0809A/D transducer is in motoring condition or the signal of generating state input single-chip microcomputer as synchronous motor, single-chip microcomputer is by changing the 0832D/A output valve, to regulate exciting current, guarantee that synchronous motor is in when electronic, electric current leading voltage phase place 20 degree, when being in generating state, electric current leading voltage phase place 160 degree are to guarantee that synchronous motor is in little mistake and encourages state.

60,000 tons of every month ore removals of old factory tin ore select factory to the government authorities mountain, and then ore potential energy has 11.123 ten thousand KWH altogether, implements the present invention, energy in 80% returns electrical network, 8.9 ten thousand KWH that then can generate electricity by way of merging two or more grid systems in every month calculate with 0.3 yuan/KWH, can obtain 320,000 yuan of economic benefits every year.Implement this scheme and need drop into purchase four synchronous motors and 250,000 yuan altogether of a small amount of auxiliary equipment funds altogether, promptly regained fully invested, the cableway transportation function is had no effect in 1 year with power.

Claims

1, a kind of cableway generating method, its principal character is to replace asynchronous motor with synchronous motor.

2, cableway generating method according to claim 1 is characterized in that the synchronous motor excitation electric current adopts control automatically.

3, cableway generating ten thousand methods according to claim 1 and 2, the automatic control that it is characterized in that exciting current adopts phase measuring circuit and single-chip microcomputer to carry out, so that allow they and thyristor excitation power supply match, play automatic adjusting synchronous motor excitation electric current, synchronous motor can be stablized, successfully work in the effect of electronic/generating state.