Method of power supply to summer milking system from small hydro-electric station

FIELD: electricity.

SUBSTANCE: at the moment of small hydro-electric station start-up all stages of ballast load are started, when rated frequency of generator 2 rotation is achieved, an asynchronous electric motor of a water supply pump 5 is started with a device of reactive power compensation. At the same time the load is redistributed between the ballast load and the started asynchronous electric motor of the water supply pump 5 with the device of individual compensation of reactive power, therefore voltage at the generator 2 stator changes insignificantly. Then upon completion of a transition process, an electric motor of a vacuum pump 6 is started with a device of individual compensation of reactive power. Upon completion of the transition process, similarly electric motors of the first milk pump 7, the second milk pump 8 and a pump of a milk cooler 9 are started, which, due to low capacity in respect to a generator of the small hydro-electric station, slightly reduce voltage at its leads, and therefore electromagnet torque at all electric motors operating under load practically does not change.

EFFECT: higher efficiency of small hydro-electric station application and improved stability of operation of milking system process equipment.

5 dwg

 

The invention relates to agriculture and can be used to supply summer milking from an independent source of energy, using a micro hydropower plant (micro hydro) with the electric permanent magnet motor and ballast load.

Known design submersible the free-threaded microhydroelectric that includes a turbine with a horizontal axis of rotation, connected with submerged sealed generator (see EN 2247859 C1, 10.03.2005, F03B 13/00).

Known mechanical electrical machine, part of the free-threaded micro hydro (see EN 2406213 AND, 10.12.2010, H02K 21/24).

There is a method of stabilizing the frequency of the output voltage of the generator micro hydro by using autobalance load, which results in the redistribution of useful and ballast parts of the load on the generator with the preservation of its total value constant (see LUKUTIN BV and other Renewable energy in decentralized electricity Moscow, Energoatomizdat, 2008, s, risb), adopted as a prototype.

The disadvantages of the above technical solutions should include the fact that when used in the construction of micro hydro generator with permanent magnets, without winding, the process of milking cor is in the summer parlour using an electric drive on the basis of induction motors, can be violated in connection with the strict requirements to the voltage level of the Autonomous power supply system (small reduction in voltage is accompanied by a sharp decrease in torque at the motor shaft). This fact does not allow a wide use of the generators of low power permanent magnet in the stand-alone power supply system summer milking from micro hydro, because this type of machine there is no excitation winding and, consequently, the possibility of regulating the output voltage of the generator, this raises the problem of voltage regulation.

The objective of the invention is to increase the efficiency of the use of micro hydro orthogonal turbine with a horizontal axis of rotation and a generator with permanent magnets when used as a stand-alone power supply summer milking and stability of equipment operation summer milking.

The problem is solved in that in the method of operation of the equipment year of milking when electricity from micro hydro, consisting of a turbine and generator, not having a field winding, in terms of dynamically changing load at which frequency stabilization rotation system-easy installation the turbine I is due to the redistribution useful and ballast parts of the load on the generator with the preservation of its total value constant, according to the invention as a micro hydro use the free-threaded submersible micro hydro orthogonal turbine and synchronous generator with permanent magnets, and as the payload used induction motors of the vacuum pump and pump water supply with individual devices for reactive power compensation, consisting of parallel connected batteries of static capacitors and induction motors of the first and second milk pump and induction motor coolant pump milk, and as ballast use multistage power the heater, the time of start-up micro hydro include all stages of a ballast load, upon reaching the rated speed of the generator include asynchronous motor pump water device reactive power compensation, load is redistributed between the ballast load and the included electric pump water device reactive power compensation, then after the completion of the transition process include the motor of the vacuum pump unit of reactive power compensation, then similarly include motors first milk pump, the second milk pump and pump ohla is Italia milk.

Figure 1 shows the block diagram of the micro with autobalance frequency stabilization.

Figure 2 shows the model of work equipment summer milking when electricity from micro hydro.

Figure 3 shows alternate start asynchronous load with the individual compensation of the reactive power of the motor of the vacuum pump and pump water.

Figure 4 shows the speed (PU) generator rotor micro hydro under the sequential start asynchronous load with the individual reactive power compensation.

Figure 5 shows the voltage (PU) at the output of the generator micro hydro under the sequential start asynchronous load with the individual reactive power compensation.

Block diagram of power supply system summer milking from an independent source of energy that uses the micro-synchronous generator permanent magnet motor and ballast load (figure 1), includes mounted on a shaft orthogonal to the turbine 1 and the synchronous generator 2 with permanent magnets, the findings of which ballast connected load 3 to the control unit and through the switching devices 4 payload consisting of an induction motor of the water pump 5 and connected in parallel thereto a block of static capacitors 10, the induction motor Modacalzado is about (or vacuum) pump 6 and connected in parallel thereto a block of static capacitors 10, asynchronous electric motors of the first milk pump 7, the second milk pump 8, the coolant pump milk 9 (figure 1).

To confirm the claimed method the simulation of the operation of the equipment year of milking when electricity from micro hydro presented in figure 2.

The control method of the micro using the claimed method is as follows.

At the time of start-up micro hydro include all stages of a ballast load (ballast load in this case is made in the form of an electric water heater with heating Elements), upon reaching the rated speed of the generator (figure 4) include an asynchronous motor pump water (water is carried out, for example, from a well) with the unit of reactive power compensation (figure 3). Thus redistribute the load between the ballast load and enabled asynchronous motor pump water device individual compensation of reactive power, so the voltage at the stator of the generator is changed slightly. Then, after the completion of the transition process include liquid ring induction motor (or vacuum) pump (to support the process of milking vacuum) with a personal device of reactive power compensation. After completion of the transition about the ECCA similarly include a low-power asynchronous motors with squirrel-cage rotor of the first milk pump, the second milk pump and coolant pump milk. They are due to low power, relatively generator micro hydro, slightly reduce the voltage on the findings and, thereby, the electromagnetic torque at all operating under load the motor is practically unchanged (figure 5).

This method allows to increase the effectiveness of micro hydro with permanent magnets and stability of equipment operation summer milking by rational redistribution useful (induction motors) and ballast (electric water heater) parts of the load on the generator with the preservation of its total value constant and individual compensation of reactive power electric motors.

The proposed method can be quite easy structurally implemented and used in agriculture for the supply of summer milking from an independent source of energy, using submersible free-threaded the micro hydropower plant including a turbine with a horizontal axis of rotation, connected with submerged sealed with a synchronous generator permanent magnet motor (electric water pump, liquid ring pump, two milk pumps, coolant pump milk) and ballast (elektropodogreva the El with Heaters) load.

The method of operation of the equipment summer milking in the supply of energy from microhydroelectric (micro hydro), consisting of a turbine and generator, not having a field winding, in terms of dynamically changing load at which the stabilization of the turbine speed at the expense of redistribution useful and ballast parts of the load on the generator with the preservation of its total value constant, characterized in that as micro hydro use the free-threaded submersible micro hydro orthogonal turbine and synchronous generator with permanent magnets, and as the payload used induction motors of the vacuum pump and pump water supply with individual devices for reactive power compensation, consisting of parallel connected of capacitor banks, as well as induction motors of the first and second milk pump and induction motor coolant pump milk, and as ballast use multistage power the heater, the time of start-up micro hydro include all stages of a ballast load, upon reaching the rated speed of the generator include asynchronous motor pump water with a compensation of the reactive power is, thus redistribute the load between the ballast load and the included electric pump water device reactive power compensation, then after the completion of the transition process include the motor of the vacuum pump unit of reactive power compensation, then similarly include motors first milk pump, the second milk pump and coolant pump milk.



 

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5 dwg

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