A diversion tunnel type distributed pumped storage power station and construction method thereof

Abstract

The present invention discloses a diversion tunnel type distributed pumped storage power station. It includes a diversion tunnel, a support platform, fasteners, a pressure steel pipe, a newly added water pump unit, and an original generator unit in the diversion tunnel; the support platform, fasteners, pressure steel pipe, a newly added water pump unit group, and the original generator unit in the diversion tunnel are all arranged in the diversion tunnel; the support platform is arranged at the bottom of the diversion tunnel; the pressure steel pipe is installed on the support platform through fasteners; the original generator unit in the diversion tunnel is located on the downstream side of the dam; the newly added water pump unit group is installed at the downstream outlet of the diversion tunnel and is located on the downstream side of the original generator unit in the diversion tunnel. The present invention has the advantages of high transformation efficiency and low transformation cost. The present invention also discloses a construction method of a diversion tunnel type distributed pumped storage power station.

Description

Technical Field

[0001] The present invention relates to a diversion tunnel type distributed pumped storage power station and also relates to a construction method of the diversion tunnel type distributed pumped storage power station. Background Art

[0002] Power generation methods such as wind power and solar power are greatly affected by natural factors and have obvious randomness and volatility.

[0003] The operating characteristics of renewable power generation systems such as wind power and photovoltaic power are that they are greatly affected by natural factors and their power generation has random fluctuation characteristics. This random fluctuation is not only the result of various external conditions such as climate conditions, but also the result of the unstable supply and demand relationship of the power system. The large proportion of renewable energy grid-connected operation will have an impact on the power system. For power decision-making departments, on the one hand, the fluctuation of wind power and photovoltaic output will have a negative impact on the safe and stable operation of the power system; on the other hand, when encountering excess electricity, wind power and photovoltaic power are often the first objects to be abandoned by power decision-making departments, which in turn causes the loss of income of wind power and photovoltaic project developers. If you want to completely solve the random fluctuations of renewable energy to the power system and protect the economic interests of renewable energy developers, you must select appropriate energy storage technology and integrate it with the renewable power generation system.

[0004] Pumped storage power stations play an important role in regulating loads, promoting grid-connected clean energy, and maintaining the safety and stability of the power system. At present, the installed capacity of pumped storage in China is already low, and wind power and photovoltaic power stations will continue to increase significantly in the future. The domestic power market urgently needs to increase the installed capacity of pumped storage, or even find a way to quickly transform conventional hydropower stations into pumped storage power stations.

[0005] Before the construction of the foundation pit of a hydropower station, temporary cofferdams need to be built upstream and downstream to block the water flow. At the same time, the diversion tunnel that has been excavated in advance is used to guide the water flow so that the river water does not flow through the construction foundation pit but flows downstream. As a temporary hydraulic structure, the diversion tunnel is usually blocked and abandoned after the completion of the hydropower station.

[0006] The current domestic power market is in urgent need of increasing the installed capacity of pumped storage. Existing plans have set development goals for the installed capacity of pumped storage in my country. However, the installed capacity of pumped storage currently completed only accounts for 1.43% of the total installed capacity of power sources in the country, which is relatively low. At the same time, in the past ten years, the installed capacity of wind power and photovoltaic power in China has experienced rapid development. The proportion of wind power installed capacity has increased from 3.06% to 12.79%, and the proportion of photovoltaic installed capacity has increased from 0.03% to 11.52%. Obviously, the construction of pumped storage power stations in my country has lagged seriously, and there is an urgent need to find a way to increase pumped storage power stations efficiently and at low cost. Summary of the invention

[0007] The first purpose of the present invention is to provide a diversion tunnel type distributed pumped storage power station, which can efficiently and low-cost utilize the diversion tunnel of the hydropower station and convert it into a pumped storage power station.

[0008] The second purpose of the present invention is to provide a construction method for the diversion tunnel type distributed pumped storage power station, which is a method for quickly and low-costly transforming a conventional hydropower station into a pumped storage power station.

[0009] In order to achieve the first object of the present invention, the technical solution of the present invention is: a diversion tunnel type distributed pumped storage power station, characterized in that it includes a diversion tunnel, a support platform, fasteners, a pressure steel pipe, a newly added water pump unit, and an original generator unit in the diversion tunnel;

[0010] The supporting platform, fasteners, pressure steel pipes, and the original generator set in the diversion tunnel are all installed in the diversion tunnel;

[0011] The newly added water pump unit is installed at the downstream outlet of the diversion tunnel and is located on the downstream side of the original generator unit in the diversion tunnel; the newly added water pump unit serves as the motor of the pumped storage power station, and at the same time, the original generator unit serves as the generator of the pumped storage power station;

[0012] The support platform is set at the bottom of the diversion tunnel; the pumping pressure steel pipe of the pumped storage power station is installed on the support platform through fasteners;

[0013] The original generator set in the diversion tunnel is located on the downstream side of the dam.

[0014] In the above technical solution, a plurality of newly added water pump units form a water pump unit group;

[0015] The water pump unit group includes two layout types: a water pump unit group for a single large diversion tunnel and a water pump unit group for multiple small diversion tunnels;

[0016] When the diversion tunnel type distributed pumped storage power station adopts a single large diversion tunnel water pump unit group arrangement type, the support platform is set at the bottom of a diversion tunnel, and the pressure steel pipes of the water pump unit group are arranged one by one on the support platform. When the pumped storage power station is in operation, the water diversion pressure steel pipes are activated one by one according to the output of wind power and photovoltaic power generation;

[0017] When the diversion tunnel type distributed pumped storage power station adopts a water pump unit group arrangement type with multiple small diversion tunnels, there are multiple diversion tunnels, and a pressure steel pipe is arranged in each diversion tunnel;

[0018] Support platforms and fasteners are arranged at the bottom of each diversion tunnel, and the pressure steel pipes of the water pump unit group are fixed on the support platform by fasteners; when the pumped-storage power station is in operation, the water-conducting pressure steel pipes are activated in sequence on the left and right banks according to the output of wind power and photovoltaic power.

[0019] In the above technical solution, the pressure steel pipe is installed by splicing, which is spliced ​​step by step from the downstream tunnel outlet to the upstream tunnel entrance.

[0020] In order to achieve the second object of the present invention, the technical solution of the present invention is: the construction method of the diversion tunnel type distributed pumped storage power station is characterized by comprising the following steps:

[0021] Step 1: Select conventional hydropower stations that meet the transformation conditions;

[0022] In areas where pumped storage power stations are needed, conventional hydropower stations with built diversion tunnels and a certain amount of surplus storage capacity should be selected;

[0023] Step 2: Transformation of conventional hydropower stations;

[0024] Utilize the diversion tunnel that is temporarily used during the construction of the hydropower station and abandoned after the construction is completed, place a support platform and fasteners at the bottom of the diversion tunnel, and fix the pumping pressure steel pipe of the pumped storage power station to the support platform through fasteners;

[0025] A water pump unit is installed at the downstream outlet of the diversion tunnel as the motor of the pumped storage power station. At the same time, the original generator unit of the hydropower station is used as the generator of the pumped storage power station.

[0026] Step 3: Operation of the transformed pumped storage power station;

[0027] The output of wind power and photovoltaic power is unstable, so in many cases their output cannot meet the starting power requirements of a single large pump unit, and the fixed speed pump unit does not have the ability to adjust power. The present invention uses the advantages of the diversion tunnel being built in advance and no additional construction period and cost to change the single large pump unit scheme to a pump unit group scheme, so that the transformed pumped storage power station is more suitable for complementary power generation with wind power and photovoltaic power stations.

[0028] The water pump unit group includes two layout types: a water pump unit group for a single large diversion tunnel and a water pump unit group for multiple small diversion tunnels;

[0029] The solution for the pump group of a single large diversion tunnel is to install a support platform at the bottom of the tunnel, and then arrange the pressure pipes of the pump group one by one on the support platform; when the pumped storage power station is in operation, the water diversion pressure pipes are activated one by one according to the output of wind power and photovoltaic power;

[0030] The solution for the pump unit group of multiple small diversion tunnels is to arrange fasteners at the bottom of each diversion tunnel and then fix the pressure steel pipe of the pump unit; when the pumped storage power station is in operation, the water diversion pressure steel pipes are activated in sequence on the left and right banks according to the output of wind power and photovoltaic power;

[0031] The specific layout and operation mode will be determined according to the preliminary construction conditions of the hydropower station.

[0032] In the above technical solution, in step 2, the pressure steel pipe is installed by splicing, step by step from the downstream tunnel outlet to the upstream tunnel entrance.

[0033] The present invention has the following advantages:

[0034] (1) The present invention selects conventional hydropower stations that meet the transformation conditions in the area where the energy storage station needs to be added, which has the following advantages: first, the diversion tunnel of the hydropower station is required to be built; second, the hydropower station to be transformed needs to have a certain amount of surplus storage capacity, that is, it must have the ability to store water and generate electricity; third, the power transmission channel of the hybrid pumped storage power station after the transformation is unobstructed, that is, the benefits of the pumped storage power station can be brought into play;

[0035] (2) The transformation scheme of the present invention is to utilize the diversion tunnel temporarily used for the construction of the hydropower station and abandoned after the construction is completed, and place a supporting platform and fasteners at the bottom of the diversion tunnel, and fix the pumping pressure steel pipe of the pumped storage power station thereon. The pressure steel pipe is installed by splicing, and is spliced ​​step by step from the downstream tunnel outlet to the upstream tunnel entrance. A water pump unit is installed at the downstream outlet of the diversion tunnel as the motor of the pumped storage power station. At the same time, the original generator unit of the hydropower station is used as the generator of the pumped storage power station, so that the conventional hydropower station can be quickly and cost-effectively transformed into a hybrid pumped storage power station. The hybrid pumped storage power station after transformation can be selected to operate as a conventional hydropower station or as a pumped storage power station within one or more years according to actual conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the present invention using a diversion tunnel of a hydropower station to rebuild it into a pumped storage power station.

[0037] Figure 2 This is a cross-sectional view of the arrangement of the pump unit group in the present invention in a single large diversion tunnel.

[0038] Figure 3 It is a cross-sectional view of the arrangement type of the water pump unit group in the diversion tunnel using multiple small diversion tunnels.

[0039] Figure 4It is a schematic diagram of the complementary cooperation between a large-scale single-unit water pump unit group (1×100MW) and wind and solar power in the present invention.

[0040] Figure 5 This is a schematic diagram of the complementary cooperation between a small-scale water pump unit group (4×25MW) and wind and solar power in the present invention.

[0041] In the figure, 1-support platform, 2-fasteners, 3-pressure steel pipe, 4-newly added water pump unit, 5-original generator unit in the diversion tunnel.

[0042] exist Figure 1 In the figure, A represents diversion tunnel, A1 represents left bank diversion tunnel; A2 represents right bank diversion tunnel; C represents dam, D represents cofferdam, D1 represents upstream cofferdam; D2 represents downstream cofferdam; F represents water flow direction, H represents river.

[0043] exist Figure 2 , Figure 3 In the figure, A is the diversion tunnel and B is the mountain. DETAILED DESCRIPTION

[0044] The following is a detailed description of the implementation of the present invention in conjunction with the accompanying drawings, but they do not constitute a limitation of the present invention and are only given as examples. At the same time, the advantages of the present invention are made clearer and easier to understand through the description.

[0045] The present invention combines the construction characteristics of conventional hydropower stations with the working principle of pumped-storage power stations, and proposes a method for transforming the diversion tunnels temporarily used for hydropower station construction and abandoned after the construction into the water guide holes of the pumped-storage power station, which can quickly and inexpensively transform the existing conventional hydropower station into a pumped-storage power station. At the same time, taking advantage of the fact that the diversion tunnel has been built in advance and there is no additional construction period and cost, a method for transforming a single large pump-storage water pump unit into a small water pump unit group is proposed, so that the transformed pumped-storage power station is more suitable for complementary power generation with wind power and photovoltaic power stations.

[0046] Referring to the attached drawings, it can be seen that: a diversion tunnel type distributed pumped storage power station includes a diversion tunnel A, a support platform 1, a fastener 2, a pressure steel pipe 3, a newly added water pump unit 4, and an original generator unit 5 in the diversion tunnel;

[0047] The supporting platform 1, fasteners 2, pressure steel pipes 3, and the original generator set 5 in the diversion tunnel are all arranged in the diversion tunnel A;

[0048] The newly added water pump unit 4 is installed at the downstream outlet of the diversion tunnel and is located at the downstream side of the original generator unit 5 in the diversion tunnel; the newly added water pump unit serves as the motor of the pumped storage power station, and at the same time, the original generator unit serves as the generator of the pumped storage power station;

[0049] The support platform 1 is arranged at the bottom of the diversion tunnel A; the pumping pressure steel pipe 3 of the pumped storage power station is installed on the support platform 1 through the fastener 2;

[0050] The original generator set 5 in the diversion tunnel is located on the downstream side of the dam C.

[0051] Further, a plurality of newly added water pump units 4 form a water pump unit group;

[0052] The water pump unit group includes two layout types: a water pump unit group for a single large diversion tunnel and a water pump unit group for multiple small diversion tunnels;

[0053] When the diversion tunnel type distributed pumped storage power station adopts a single large diversion tunnel water pump unit group arrangement type, the support platform 1 is set at the bottom of a diversion tunnel, and the pressure steel pipes 3 of the water pump unit group are arranged one by one on the support platform 1. When the pumped storage power station is in operation, the water-conducting pressure steel pipes are activated one by one according to the output of wind power and photovoltaic power generation;

[0054] When the diversion tunnel type distributed pumped storage power station adopts a water pump unit group arrangement type of multiple small diversion tunnels, there are multiple diversion tunnels, and a pressure steel pipe 3 is arranged in each diversion tunnel;

[0055] A supporting platform 1 and fasteners 2 are arranged at the bottom of each diversion tunnel, and the pressure steel pipes 3 of the water pump unit group are fixed on the supporting platform 1 through the fasteners 2; when the pumped storage power station is in operation, the water-conducting pressure steel pipes are activated in sequence on the left and right banks according to the output of wind power and photovoltaic power.

[0056] Furthermore, a plurality of pressure steel pipes are connected by a splicing method, and the pressure steel pipe 3 is spliced ​​step by step from the downstream tunnel outlet to the upstream tunnel entrance.

[0057] Referring to the attached drawings, it can be seen that the construction method of the diversion tunnel type distributed pumped storage power station is characterized in that it includes the following steps:

[0058] The first step is to select conventional hydropower stations that meet the conditions for transformation. There needs to be a demand for new energy storage power stations in the surrounding area of ​​the conventional hydropower station, such as wind power and photovoltaic power stations of a certain scale in the surrounding area. At the same time, the selected hydropower stations must meet the following requirements: First, the diversion tunnel of the hydropower station has been built; second, the hydropower station to be transformed needs to have a certain amount of surplus storage capacity, that is, it must have the ability to store water and generate electricity; third, the power transmission channel of the hybrid pumped storage power station after the transformation is unobstructed, that is, the benefits of pumped storage can be brought into play after the transformation;

[0059] The second step is to transform the conventional hydropower station. The transformation plan uses the diversion tunnel that is temporarily used for the construction of the hydropower station and abandoned after the construction is completed. A support platform and fasteners are placed at the bottom of the diversion tunnel to fix the pumping pressure steel pipe of the pumped storage power station on it; the pressure steel pipe is installed by splicing from the downstream tunnel outlet to the upstream tunnel entrance step by step; a water pump unit is installed at the downstream outlet of the diversion tunnel as the motor of the pumped storage power station. At the same time, the original generator unit of the hydropower station is used as the generator of the pumped storage power station;

[0060] The third step is the operation of the renovated pumped-storage power station. Considering that the renovated pumped-storage power station is likely to be mainly used to support the operation of renewable energy power stations such as wind power and photovoltaic power stations, it is necessary to make appropriate designs based on the characteristics of renewable energy; due to the unstable output of wind power and photovoltaic power, in many cases their output cannot meet the starting power requirements of large pumped-storage power station single-unit water pump units, and the fixed-speed water pump units of large pumped-storage power stations do not have the ability to adjust power, which will result in a considerable amount of wind power and photovoltaic output not being converted into water energy for storage in the upper reservoir and being wasted;

[0061] The present invention takes advantage of the fact that the diversion tunnel of the hydropower station selected for transformation has been built in advance and there is no additional construction period and cost. The single large pump unit scheme of the pumped storage water pump can be changed to a small pump unit group scheme, so that the transformed pumped storage power station is more suitable for complementary power generation with wind power and photovoltaic power stations; the pump unit group has two layout types: a pump unit group of a single large diversion tunnel and a pump unit group of multiple small diversion tunnels;

[0062] The solution for the pump group of a single large diversion tunnel is to install a support platform at the bottom of the tunnel, and then arrange the pressure pipes of the pump group one by one on the support platform; when the pumped storage power station is in operation, the water diversion pressure pipes are activated one by one according to the output of wind power and photovoltaic power;

[0063] The scheme of the pump unit group of multiple small diversion tunnels is based on the situation that some hydropower stations have large water flows during the construction period and diversion tunnels are built on the left and right banks. At this time, fasteners can be arranged at the bottom of each diversion tunnel, and then the pressure steel pipes of the pump units can be fixed; when the pumped storage power station is in operation, the water-conducting pressure steel pipes are used in sequence on the left and right banks of the diversion tunnel A according to the output of wind power and photovoltaic power;

[0064] The specific layout type and operation mode can be determined according to the actual situation of the hydropower station.

[0065] Other parts not described belong to the prior art.

Claims

1. A construction method for a diversion tunnel type distributed pumped storage power station, the diversion tunnel type distributed pumped storage power station comprising a diversion tunnel, a support platform (1), a fastener (2), a pressure steel pipe (3), a newly added water pump unit (4), and an original generator unit (5) in the diversion tunnel; The supporting platform (1), the fasteners (2), the pressure steel pipe (3), and the original generator set (5) in the diversion tunnel are all arranged in the diversion tunnel; The newly added water pump unit (4) is installed at the downstream outlet of the diversion tunnel and is located at the downstream side of the original generator unit (5) in the diversion tunnel; The support platform (1) is arranged at the bottom of the diversion tunnel; the pumping pressure steel pipe (3) of the pumped storage power station is installed on the support platform (1) through a fastener (2); The original generator set (5) in the diversion tunnel is located on the downstream side of the dam; Features: The construction method comprises the following steps: Step 1: Select conventional hydropower stations that meet the transformation conditions; In areas where pumped storage power stations are needed, conventional hydropower stations with built diversion tunnels and a certain amount of surplus storage capacity should be selected; Step 2: Transformation of conventional hydropower stations; A diversion tunnel temporarily used during the construction of a hydropower station and abandoned after the construction is completed is utilized, and a support platform (1) and fasteners (2) are placed at the bottom of the diversion tunnel, and a pumping pressure steel pipe (3) of the pumped storage power station is fixed to the support platform (1) through the fasteners (2); A water pump unit (4) is installed at the downstream outlet of the diversion tunnel as the motor of the pumped storage power station. At the same time, the original generator unit (5) in the diversion tunnel is used as the generator of the pumped storage power station. Step 3: Operation of the transformed pumped storage power station; By using the diversion tunnel, the single-unit pump-storage water pump scheme was changed to a water pump unit group scheme, making the transformed pump-storage power station more suitable for complementary power generation with wind power and photovoltaic power stations; The water pump unit group includes two layout types: a water pump unit group for a single large diversion tunnel and a water pump unit group for multiple small diversion tunnels; The solution for the pump group of a single large diversion tunnel is to install a support platform at the bottom of the tunnel, and then arrange the pressure pipes of the pump group one by one on the support platform; when the pumped storage power station is in operation, the water diversion pressure pipes are activated one by one according to the output of wind power and photovoltaic power; The solution for the water pump unit group of multiple small diversion tunnels is to arrange fasteners at the bottom of each diversion tunnel and then fix the pressure steel pipe of the water pump unit; when the pumped-storage power station is in operation, the water-conducting pressure steel pipes are activated in sequence on the left and right banks according to the output of wind power and photovoltaic power.

2. The construction method of the diversion tunnel type distributed pumped storage power station according to claim 1, characterized in that: The pressure steel pipe (3) is connected by splicing, and the pressure steel pipe (3) is spliced ​​step by step from the downstream tunnel outlet to the upstream tunnel entrance.

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