CN112128044A

CN112128044A - Brushless double-fed power generation electric system of distributed mountain top pumped storage power station

Info

Publication number: CN112128044A
Application number: CN202011045707.6A
Authority: CN
Inventors: 潘垣; 杨凯; 李黎; 熊飞
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2020-12-25

Abstract

The invention discloses a brushless double-fed power generation electric system of a distributed mountain top pumped storage power station, which comprises a drain pipe, a water pumping pipe, an upper water storage reservoir, a lower water storage reservoir and a brushless double-fed power generation electric system, wherein the drain pipe is arranged between a drain outlet of the upper water storage reservoir and a water inlet of the lower water storage reservoir, a drain outlet of the lower water storage reservoir is connected with a water inlet of the upper water storage reservoir, a power generation driving end of the brushless double-fed power generation electric system is connected into the drain pipe, a water pumping end of the brushless double-fed power generation electric system is connected onto the water pumping pipe, and a plurality of groups of brushless double-. The invention realizes the four-quadrant control operation of variable speed, constant voltage, constant frequency and variable frequency speed regulation, has small control system capacity, realizes the flexible control of active power and reactive power under a vector control strategy, has small interference of a power grid, can simultaneously play the role of active power and reactive power compensation, and simultaneously has no slip ring and electric brush in the motor, thereby not only reducing the cost of the motor, but also improving the safe reliability of the system operation and reducing the maintenance cost.

Description

Brushless double-fed power generation electric system of distributed mountain top pumped storage power station

Technical Field

The invention relates to the field of power generation equipment, in particular to a brushless double-fed power generation electric system of a distributed mountain top pumped storage power station.

Background

With the increase of the grid-connected capacity of the renewable new energy generating set, the problem of new energy consumption caused by the randomness of wind power generation and photovoltaic power generation is more prominent. Renewable energy sources such as wind power and photovoltaic power generation grid connection also provide higher requirements for peak regulation and frequency modulation capacity of a power grid. The appropriate high-capacity power energy storage power supply is a key technical measure for improving the regulation capacity of the power grid after renewable clean energy is introduced into the power grid, and the regulation capacity of the system is a necessary condition for accepting high-capacity power input outside the region and improving the consumption proportion of new energy. Among a plurality of energy storage technologies, pumped storage is the most mature electric energy storage technology with the best technical economic index at present. However, the construction of pumped storage power stations in China is relatively backward, the installed capacity of the pumped storage power station accounts for less than 3% of the total installed capacity, and the construction of the pumped storage power station needs to be accelerated by strong support from the aspects of system and technology. Meanwhile, from the types of newly-built pumped storage power stations in Japan, America and other countries, the novel pumped storage power station adopts a mode of matching a double-fed motor and a synchronous motor, and compared with the synchronous motor in the conventional pumped storage power station, the novel pumped storage power station has higher stability and operation efficiency and faster frequency and voltage regulation capability.

In the middle east and southeast regions of China, the landforms of mountains and hills are obvious, and lake branches are numerous in rivers, have natural and rich natural conditions for developing small and medium-sized hydropower, and simultaneously have a large number of urban communities with developed economic conditions and vigorous renewable energy requirements. Based on the national situation, the development of distributed mountain top pumped storage power stations is promoted in the east and south-east of China according to local conditions. The power station utilizes the existing valley reservoirs as lower reservoirs (such as three gorges reservoir, Qingjiang river rock reservoir, river blocking reservoir and the like), selects a plurality of upper reservoirs in mountainous areas at two sides of the valley reservoir (the existing medium and small reservoirs can be utilized, and a new reservoir can be formed by constructing at most two dam sites on one dam site according to topographic features), and the generator set can select a reversible water-pumping energy storage set adopting a brushless double-fed motor technology. Therefore, a series of small and medium-sized pumped storage power stations which can pump water and generate power and are distributed along with river branch drainage basin are formed, a large amount of wind, light, water and electricity outside the region are purchased in a low-load period, power is generated and sold to surrounding cities in a high-load period, and peak regulation and valley regulation and dynamic optimization scheduling of a regional power grid are implemented. Through the technical improvement, the energy storage scheduling method is an economic large power grid system energy storage scheduling solution which can consume renewable energy sources such as northwest wind power photoelectricity, southwest hydropower station and the like on a large scale.

The electric power generation system refers to a power generation motor unit in which a generator can be used as both a water pump motor and a hydroelectric generator. When the power consumption of the electric power system is low, the unit is used as a water pump operation mode, the redundant electric power of the electric power system is used, the stored water of the lower reservoir is lifted to the upper reservoir, and the valley filling effect of the consumed electric power is achieved. When the power system is in a peak load period and the power is possibly insufficient, water in the upper reservoir can be introduced into the lower reservoir unit, and the unit operates as a power generation mode, so that the peak regulation effect of the power system is achieved. The unit can be used as a hydroelectric generator, a water pump motor, power supply and power load. The electric pumped-storage system for power generation is obviously different from the conventional pumped-storage system.

At present, two main variable-speed pumped storage units are provided, one is a synchronous power generation pumped storage unit, and the other is a double-fed pumped storage unit. However, both of the above have significant disadvantages. The synchronous power generation pumped storage unit needs to be configured with a full-power controller, and the cost of the whole system is high due to the large capacity of a single unit of the pumped storage power station. The double-fed pumped storage unit is provided with an electric brush and a slip ring device, and the rotor part of the double-fed pumped storage unit is high in maintenance cost and poor in safety and reliability.

Disclosure of Invention

The invention aims to solve the problems and provide a brushless double-fed power generation electric system of a distributed mountain top pumped storage power station.

The invention realizes the purpose through the following technical scheme:

the brushless double-fed power generation system comprises a drain pipe, a water pumping pipe, an upper water storage reservoir, a lower water storage reservoir and a brushless double-fed power generation electric system, wherein the drain pipe is arranged between a water outlet of the upper water storage reservoir and a water inlet of the lower water storage reservoir, a water outlet of the lower water storage reservoir is connected with a water inlet of the upper water storage reservoir, a power generation driving end of the brushless double-fed power generation electric system is connected into the drain pipe, a water pumping end of the brushless double-fed power generation electric system is connected onto the water pumping pipe, and a plurality of groups of brushless double-fed power generation electric systems are arranged between the.

Further, brushless double-fed electricity generation electric system comprises the hydraulic turbine, brushless double-fed motor, suction pump, derailleur, drive wheel, the hydraulic turbine set up in the drain pipe, the hydraulic turbine through the pivot with brushless double-fed motor's pivot is connected, the suction pump set up in on the suction pipe, brushless double-fed motor's other end pivot with the derailleur is connected, the output shaft of derailleur passes through the drive wheel with the drive shaft connection of water pump.

Furthermore, the brushless double-fed motor comprises a brushless double-fed motor and a control system capable of operating in four quadrants, two sets of three-phase symmetrical independent windings which have different pole pairs and are not directly coupled with each other are distributed on a stator of the brushless double-fed motor, one set of the windings is connected with a power grid, the other set of the windings is connected with the control system in a winding mode, and the control system is connected with the power grid.

Preferably, the number of pole pairs of the brushless doubly-fed motor is 10 to 50, and the rotor adopts a winding type and a wave winding structure. The transmission ratio of the transmission is 1: 4 to 1: 50. the water pump is a reciprocating pump or a centrifugal pump.

The invention has the beneficial effects that:

compared with the prior art, the brushless double-fed power generation electric system of the distributed mountain top pumped storage power station can realize four-quadrant control operation of variable speed, constant voltage, constant frequency and variable frequency speed regulation, has small control system capacity, can realize flexible control of active power and reactive power under a vector control strategy, has small interference on a power grid, can play a role in active power and reactive power compensation, and has no slip ring and electric brush, so that the cost of the motor is reduced, the safety and reliability of system operation are improved, and the maintenance cost is reduced.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural diagram of a brushless doubly-fed generator electric system of the present invention.

In the figure: the system comprises a water discharge pipe 1, a water suction pipe 2, an upper water storage reservoir 3, a lower water storage reservoir 4, a brushless double-fed power generation electric system 5, a water turbine 51, a brushless double-fed motor 52, a water suction pump 53, a speed changer 54 and a driving wheel 55.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

as shown in fig. 1: the brushless double-fed power generation system comprises a drain pipe 1, a water pumping pipe 2, an upper water storage reservoir 3, a lower water storage reservoir 4 and a brushless double-fed power generation electric system 5, wherein the drain pipe 1 is arranged between a drain port of the upper water storage reservoir 3 and a water inlet of the lower water storage reservoir 4, a drain port of the lower water storage reservoir 4 is connected with a water inlet of the upper water storage reservoir 3, a power generation driving end of the brushless double-fed power generation electric system 5 is connected into the drain pipe 1, a water pumping end of the brushless double-fed power generation electric system 5 is connected onto the water pumping pipe 2, and a plurality of groups of brushless double-fed power generation electric systems 5 are arranged between the drain pipe.

Further, brushless doubly-fed power generation electric system 5 comprises hydraulic turbine 51, brushless doubly-fed motor 52, suction pump 53, derailleur 54, drive wheel 55, hydraulic turbine 51 set up in drain pipe 1, hydraulic turbine 51 through the pivot with brushless doubly-fed motor 52's pivot is connected, suction pump 53 set up in on the drinking-water pipe 2, brushless doubly-fed motor 52's other end pivot with derailleur 54 is connected, the output shaft of derailleur 54 passes through drive wheel 55 with the drive shaft of water pump 53 is connected.

When the motor operates as a generator, the water turbine 51 drives the brushless doubly-fed motor 52 to convert potential energy into electric energy and transmit the electric energy to a power grid; when the brushless double-fed motor operates as a motor, the brushless double-fed motor drives a water suction pump connected with the speed changer to convert electric energy into potential energy of water, and the water in the lower water storage reservoir is pumped to the upper water storage reservoir.

As shown in fig. 1 and 2, when the device of the present invention is in a pumped storage state, a brushless doubly-fed motor 52 connected to a power grid drives a rotating shaft to rotate, and after the rotating speed is increased through a speed changer 54, the rotating shaft drives a water pump 53 to work through a driving wheel 55, and water flow is pumped from a lower reservoir 2 to an upper reservoir 1 for storage. When the device is in a water discharging and power generating state, the upper water storage reservoir discharges water downwards through the water discharging pipe 1 to drive the water turbine 51 to drive the brushless double-fed motor 52 to generate power, tail water flows to the lower water storage reservoir 2, and the state of the water pumping and energy storage power generating device is continuously adjusted according to the peak-valley period of power, so that the power consumption requirement is met.

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a brushless double-fed electricity generation electric system of distributing type mountain top pumped storage power station which characterized in that: including drain pipe, drinking-water pipe, last water storage, lower water storage, brushless double-fed electricity generation electric system, the drain pipe set up in go up the outlet of water storage with down between the water inlet of water storage, down the outlet of water storage with the water inlet of last water storage is connected, brushless double-fed electricity generation electric system's electricity generation drive end is connected in the drain pipe, brushless double-fed electricity generation electric system's the end of drawing water is connected on the drinking-water pipe, the drain pipe with set up the multiunit between the drinking-water pipe brushless double-fed electricity generation electric system.

2. The brushless doubly-fed electric power generation system of a distributed mountain top pumped storage power station of claim 1, wherein: brushless doubly-fed electricity generation electric system comprises the hydraulic turbine, brushless doubly-fed machine, suction pump, derailleur, drive wheel, the hydraulic turbine set up in the drain pipe, the hydraulic turbine through the pivot with brushless doubly-fed machine's pivot is connected, the suction pump set up in on the suction pipe, brushless doubly-fed machine's other end pivot with the derailleur is connected, the output shaft of derailleur passes through the drive wheel with the drive shaft connection of water pump.

3. The brushless doubly-fed electric power generation system of a distributed mountain top pumped storage power station of claim 2, wherein: the brushless double-fed motor comprises a brushless double-fed motor and a control system capable of four-quadrant operation, two sets of three-phase symmetrical independent windings which are different in pole pair number and are not directly coupled with each other are distributed on a stator of the brushless double-fed motor, one set of the windings is connected with a power grid, the other set of the windings is connected with the control system, and the control system is connected with the power grid.

4. The brushless doubly-fed electric power generation system of the distributed mountain top pumped storage power station of claim 2 or 3, wherein: the number of pole pairs of the brushless double-fed motor is 10 to 50, and a rotor adopts a winding type and wave winding structure.

5. The brushless doubly-fed electric power generation system of a distributed mountain top pumped storage power station of claim 2, wherein: the transmission ratio of the transmission is 1: 4 to 1: 50.

6. the brushless doubly-fed electric power generation system of a distributed mountain top pumped storage power station of claim 2, wherein: the water pump is a reciprocating pump or a centrifugal pump.