Method to control hydraulic accumulating station and device for its realisation

FIELD: power engineering.

SUBSTANCE: method to control a hydraulic accumulating station (HAS), comprising at least two energy systems, one of which is energy excessive, the other one - energy deficit, and at least two units, on the shaft of each one there is a reversible electric machine and a reversible hydraulic machine, consists in the fact that stator windings of the electric machine of the first unit are connected to the first energy system in the motor mode with the hydraulic machine in the pump mode. Stator windings of the electric machine of the first unit are connected to the energy excessive system. Simultaneously stator windings of the electric machine of the second unit are connected to the energy deficit system in the generator mode with the hydraulic machine in the turbine mode.

EFFECT: higher usage of installed HAS equipment and reduced HAS payback period.

2 cl, 2 dwg

 

The proposed method can be used in the field of managed communications power systems on the basis of frequency converters, specifically in the management of pumped storage stations.

Currently integrate separate power systems into a single system. However, in many cases, interconnection are so low that a single system may not have a significant impact on the mode of another system, so mutual synchronous operation is often impossible. However, unwanted and separate work, as in some systems, an additional deficit. In addition, there are electrical systems, in which the frequency changes due to fluctuations powerful loads. When combining these systems with a system with high requirements for power quality difficulties of their mutual synchronous operation.

Known similar way [Vedalken A.S. pumped storage power plant. RF patent №2301298, IPC EV 9/00, priority 27.12.2007] management of pumped storage power station (HPS)containing two or more units, on the shaft of each of which is reversible electric and reversible hydraulic machines, namely, that the stator windings of electrical machines of all units connected to the grid in the engine is egime with hydraulic machines in the pumping mode or stator windings of electrical machines of all units connected to the grid in the generator mode, with hydraulic machines in the turbine mode. This method has the following disadvantage. In this method of control and pump station can be used only with a certain periodicity, resulting in underutilization of the installed equipment PSPP.

Also known prototype-the way [Gotovtsev A.L. pumped storage plant. ELECTRO, 2007. No. 1, p.43-48.] management of pumped storage power station (HPS), containing at least two units, on the shaft of each of which is reversible electric and reversible hydraulic machines, based on the fact that in the mode of accumulation of energy all electric machines include engine, and all reversible hydraulic machine includes a pump, in the processing mode stored energy all electric machines include a generator, and all the reversible hydraulic machine include turbine.

The disadvantage of the prototype method, as the method-analogue, is that in this way of pumped storage management station can be used only with a certain periodicity, resulting in underutilization of the installed equipment PSPP.

It is known device [Eroshevich CENTURIES, Kiryanov N. Large electroaccumulators installation. - Izv. THE USSR ACADEMY OF SCIENCES. Energy and transport, 1985, No. 1.] to implement the method, consisting of a pumped storage station (HA IS FROM). Hydraulic structure PSPP consists of two basins - upper (accumulating) and lower (feed), located at different levels and connected by a system of large inclined pipes (conduits). The upper pool can be natural (e.g., lake) or artificial (concrete pits), and the lower pool is often used as a reservoir formed by the damming of the river by a small dam. Building PSPP with units located at the downstream of, and each unit is at the lower end of the corresponding conduit. A hydroelectric pumped-storage power plants with generating units is located at the downstream of, and each unit is at the lower end of the corresponding conduit. Units currently mostly can be machine - from a reversible electric machines (motor - generator) and reversible (or reverse) hydraulic machines, workers, depending on the direction of flow and the corresponding direction of rotation either as a pump or as a turbine, i.e. in the turbine or pump modes.

The cycle of the PSP is that at night, when the load of the power system is severely reduced, all electric machine units include power system in motor mode, and all hydraulic machine units in pumping mode, the water is pumped through the conduits from the bottom of the pool at the top. In lane the odes peak load power system stored in the upper pool water conduits pass through all hydraulic machines pumped from the bottom of the pool in the turbine mode, and being with them on the same shaft all electric machines include a power system in the generator mode, generating electricity. Due to the difference between the costs of "night" energy and "peak" (usually 3-5 times) PSPP pays off for 7-8 years.

The known device has the following disadvantage. The water pumped is usually a length of the order of hundreds of meters, so the loss of them can be up to 3-5% (for example, on the first stage of Zagorskaya PSPP has 6 units; estimated head is 95-113 m of the water column (height difference between the upper and lower pools 100 m); the pipe diameter d=7.5 m; the length of the pipeline l=700 m; hydro generators with a capacity of 200 MW).

The technical problem solved by the invention is to improve, compared with the traditional use of the installed equipment PSPP, and, as a consequence reducing the payback period PSPP.

The technical result of the unification of grids with different frequencies to ensure the normal modes of the power system, one of which is power excessive, the other energodefitsita, and at least two units, on the shaft of each of which is reversible electric and reversible hydraulic machines, namely, that the stator winding of an electric machine of the first unit is connected to the first power supply system in a motor the positive mode with a hydraulic machines in pumping mode, according to the invention, the stator winding of an electric machine of the first unit is connected to abundant in the system, while the stator winding of an electric machine of the second unit is connected to the power-hungry system in generator mode with hydraulic machines in the turbine mode.

In addition, the technical problem is solved also by the fact that known and pump station containing at least two grids, one of which is power excessive, the other energodefitsita, and at least two units, on the shaft of each of which is reversible electric and reversible hydraulic machine with its conduit connecting the upper and lower basins of the pumped storage station, while the stator winding of an electric machine of the first unit is connected through its transformer and switches to abundant in the grid, stator winding of an electric machine of the second unit is connected through its transformer and switches to the power-hungry power system according to the invention, equipped with additional conduit made in the form of jumpers with gates connecting pairs of inputs of the hydraulic machines.

The proposed device is schematically represented in the drawings. Figure 1 presents a simplified diagram of two hydraulic machines PSP is more water jumper by gates.

Figure 2 presents a fragment of the wiring diagram PSPP.

According to Figure 1, PSPP two reversible units contains two reversible hydraulic machines 1 and 2 respectively with the impellers 3 and 4, the spiral chambers 5 and 6 and the conduits 7 and 8, as well as additional cross-conduit - jumper 9 gates 10 and 11, and gates 12 and 13. The conduits 7 and 8 of the spiral chambers 5 and 6 hydraulic machines 1 and 2 is connected to the upper pool PSPP (figure 1 upper and lower pools not shown)

Figure 2 presents a fragment of the electric circuit diagrams of two reversible electric machines Zagorsk PSP. Zagorskaya PSPP contains six reversible units of 200 MW and a complete electrical circuit is given in reference [Electrical engineering Handbook: 3 t / h V.3. 2 kN. KN. 1. Production and distribution of electric energy (Under the General editorship of professors MEI: I.N. Eagles (editor-in-chief), etc) 7th ed., Corr. and extra - M.: Energoatomizdat, 1988. Page 124.].

Tires combine the grids 14 and 15 is connected to the tire 500 kV 16 and 17 respectively through the switches 18, 19 and 20, 21. Bus 16 and 17, respectively, through the transformers 22 and 23 are connected with the tire 24 and 25 of the generator voltage. Bus 24 via the switches 26, 27 are connected with the stator windings of the reversible electric machine 30. Bus 25 via the switches 28, 29 with dynany with the stator windings of the reversible electric machine 31.

The device operates as follows. To join the two grids with different frequencies f1≠f2the stator winding of the electric machine 30 of the first unit is connected to the tires abundant power system 14 in motor mode with the hydraulic machine 1 (see Figure 1) in the pump mode through the switch 18 and the switch 19 is off), bus 16, a transformer 22, bus 24 and the switch 26 with direct alternation of phases (e.g., ABC). The switch 27 is turned off (it used to turn on with a reverse phase sequence, such as DIA, reversible machine 30 only when the switch 26). The stator winding of the electric machine 31 of the second unit is connected to the power-hungry system 15 in generator mode with the hydraulic machine 2 in the turbine mode through the switch 21 switch 20 is off), the bus 17, the transformer 23, the bus 25 and the switch 29 with a reverse phase sequence (for example, ASV). The switch 28 with direct phase sequence (for example, ABC) disabled (it used to turn on only when the switch 29). In such a scheme include the listed items PSPP during operation of the electrical machine 30 in the motor mode, water from the lower basin impeller 3 reversible hydraulic machine 1 of the first unit operating in the pumping mode, through the spiral chamber 5 and water is od 7 is pumped into the upper basin of the PSP. Simultaneously with the operation of the electrical machine 31 in the generator mode, water from the upper basin through the conduit 8, the spiral chamber 6 and the impeller 4 reversible hydraulic machine 2 of the second unit working in the turbine mode, enters the lower basin of the PSP.

For large lengths of conduits (e.g., Zagorskaya PSPP length of the conduits 700 m) loss in long conduits can be for the full cycle to 3-5%. When working PSP in the proposed mode of the frequency Converter for connection of energy systems to reduce these losses, according to Figure 1, the valves 12 and 13 are closed, and valves 10 and 12 are opened, thereby significantly shorten the path of water from the pump 1 to the turbine 2 via the auxiliary conduit-jumper 9. Note that in the presence of water jumper with butterfly valve device can be used as a test bench for hydraulic turbines of various types for the removal of real performance. PSPP according to the proposal. Can also be used to combine three or more grids with different frequencies.

Thus, the proposed control method, the pumped storage station allows you to use the PSP as a frequency Converter for interconnection and to transmit power from abundant system power-hungry systems is virtually any difference in their frequencies. To use the PSP as a frequency Converter for interconnection as possible during the main cycles pumped storage plant, and in the periods between the cycles. This expands the use of equipment PSPP and as a consequence reduces the payback period PSPP.

1. Way pumped storage management station containing at least two grids, one of which is power excessive, the other energodefitsita, and at least two units, on the shaft of each of which is reversible electric and reversible hydraulic machines, namely, that the stator winding of an electric machine of the first unit is connected to the first power supply system in a motor mode with the hydraulic machine in the pump mode, characterized in that the stator winding of an electric machine of the first unit is connected to abundant in the system, while the stator winding of an electric machine of the second unit is connected to the power-hungry system in generator mode with hydraulic machine in the turbine mode.

2. Pumped storage station containing at least two grids, one of which is power excessive, the other energodefitsita, and at least two units, on the shaft of each of which are reversible and reversible electric hydraulic the Kaya machine with its conduit, connecting the upper and lower basins of the pumped storage station, while the stator winding of an electric machine of the first unit is connected through the transformer and switches to abundant in the grid, stator winding of an electric machine of the second unit is connected through the transformer and switches to the power-hungry power system, characterized in that it is provided with an additional conduit made in the form of jumpers with gates connecting pairs of inputs of the hydraulic machines.



 

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