Full-electric energy station and power grid interactive regulation system and method based on pipe network energy storage

Abstract

Full-electric energy station and power grid interactive regulation system and method based on pipe network energy storage. The regulation system includes a first bypass and a second bypass. The first bypass is arranged in the full-electric energy station and includes: a first water pump, a second water pump, a third water pump, a first check valve, a second check valve, a third check valve, and a first electric regulating valve. The second bypass is arranged in the heat exchange station farthest from the chiller and includes: a pressure sensor, a second electric regulating valve, and a flow rate sensor. When the full-electric energy station does not interact with the power grid, the second electric regulating valve is closed. When the full-electric energy station interacts with the power grid, the second electric regulating valve is opened, and the opening degree of the second electric regulating valve is adjusted according to the relationship between the flow rate measured by the flow rate sensor and the preset flow rate target value. When the full-electric energy station interacts with the power grid, the operating frequency and the number of operating units of the water pumps in the first bypass are adjusted according to the relationship between the measured water supply pressure by the pressure sensor and the preset pressure target value. Improve the interactive ability between the energy station and the power grid.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated energy systems, and particularly relates to an interactive regulation and control system and method for an all-electric energy station and a power grid based on pipeline energy storage. Background Art

[0002] With the continuous improvement of living standards, people's requirements for the comfort of the building thermal environment are constantly increasing. As a result, the energy consumption of the air conditioning system for creating the building thermal environment is also constantly rising, and the total energy consumption of the building has increased sharply. Among them, during the high-temperature period in summer and the severe cold period in winter, the electricity load of the air conditioning system for creating a comfortable building thermal environment accounts for more than 30%-40% of the peak load of the total power grid. At the same time, with the development of renewable energy, the proportion of green energy such as photovoltaic and wind power in the power grid is constantly increasing. Due to the intermittency and instability of renewable energy, the power supply volatility of the power grid has increased, and the regulation and control difficulty has increased.

[0003] As a new type of regional building cooling and heating energy supply mode, the all-electric energy station can realize the large-scale application of renewable energy and low-grade heat sources, and provide centralized cooling and heating for a relatively large area of regional buildings. It has the advantages of reducing the total installed capacity of equipment, improving the equipment utilization efficiency and system energy efficiency, and reducing carbon emissions. Due to the characteristics of large lag and fluctuation of building cooling load and the pipeline network characteristics of the all-electric energy station for realizing cooling and heating in a relatively large area, the all-electric energy station is a power consumption terminal with very large flexible regulation and control potential for the power grid. How to fully explore the load characteristics and energy storage characteristics of the all-electric energy station, and on the premise of ensuring the thermal comfort of users, through the friendly interaction between the all-electric energy station and the power grid, ensure the safety of the new power grid, improve the proportion of green energy acceptance of the power grid, reduce the carbon emissions of the energy station and maximize the benefits of the all-electric energy station has become an urgent problem to be solved in the industry.

[0004] Therefore, how to enable the all-electric energy station to give full play to the pipeline energy storage characteristics, solve the bottleneck problems such as the limited total amount of energy storage participated by the pipeline network circulating water of the energy station and the low utilization rate, and the small temperature difference of circulating water energy storage, and design a new and efficient all-electric energy station system for realizing friendly interaction with the power grid has become an urgent technical problem to be solved by those skilled in the art. Summary of the Invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides an interactive regulation and control system and method for an all-electric energy station and a power grid based on pipeline energy storage, solves the bottleneck problems such as the limited total amount of energy storage participated by the pipeline network circulating water of the conventional energy station and the low utilization rate, and the small temperature difference of circulating water energy storage, and realizes the maximum energy storage and energy release of all circulating water in the energy station pipeline network under all working conditions, thereby greatly improving the interaction ability between the energy station and the power grid.

[0006] The present invention adopts the following technical solutions.

[0007] The present invention proposes an interactive regulation system between a fully electric energy station based on pipe network energy storage and the power grid. The fully electric energy station includes multiple chillers. The multiple chillers are connected in parallel and then respectively connected to the inlet pipe and the return pipe. A plurality of heat exchange stations are connected in parallel between the inlet pipe and the return pipe. Each heat exchange station includes a set of heat exchange station plate heat exchanger; it includes:

[0008] A first bypass and a second bypass;

[0009] The first bypass is arranged in the fully electric energy station. The first bypass includes: a first water pump, a second water pump, a third water pump, a first check valve, a second check valve, a third check valve, and a first electric control valve; the output ends of all chillers are connected to one end of the first electric control valve through the return pipe. The other end of the first electric control valve is respectively connected to one end of the first water pump, one end of the second water pump, and one end of the third water pump. The other end of the first water pump is connected to one end of the first check valve. The other end of the second water pump is connected to one end of the second check valve. The other end of the third water pump is connected to one end of the third check valve. The other ends of the first check valve, the second check valve, and the third check valve are connected to the input ends of all chillers through the inlet pipe;

[0010] The second bypass is arranged in the heat exchange station farthest from the chiller; the second bypass includes: a pressure sensor, a second electric control valve, and a flow rate sensor; one end of the second electric control valve is connected to the return pipe, and the other end of the second electric control valve is connected to the inlet pipe. A pressure sensor is arranged at the connection of one end of the second electric control valve to the return pipe, and a flow rate sensor is arranged at the connection of the other end of the second electric control valve to the inlet pipe;

[0011] When the fully electric energy station does not interact with the power grid, the second electric control valve is closed; when the fully electric energy station interacts with the power grid, the second electric control valve is opened, and the opening degree of the second electric control valve is adjusted according to the relationship between the flow rate measured by the flow rate sensor and the preset flow rate target value;

[0012] When the fully electric energy station interacts with the power grid, according to the relationship between the measured water supply pressure by the pressure sensor and the preset pressure target value, the operating frequency and the number of operating units of the water pumps in the first bypass are adjusted.

[0013] Preferably, when the fully electric energy station interacts with the power grid, the flow rate sensor detects the flow rate of the circulating water in the second bypass. When the flow rate measured by the flow rate sensor is greater than the preset flow rate target value, the opening degree of the second electric control valve is reduced; when the flow rate measured by the flow rate sensor is less than the preset flow rate target value, the opening degree of the second electric control valve is increased.

[0014] Preferably, the preset flow rate target value includes: a preset chilled water storage flow rate target value and a preset chilled water release flow rate target value; in the embodiment, the value range of the preset chilled water storage flow rate target value is 1-2 m / s, and the value range of the preset chilled water release flow rate target value is 1-2 m / s.

[0015] Preferably, when the water supply pressure measured by the pressure sensor is less than the preset pressure target value, the adjustment of the operating frequency and the number of operating units of the water pump in the first bypass includes:

[0016] When the number of operating water pumps is less than 3 and the operating frequency is less than 50 Hz, if the water supply pressure measured by the pressure sensor is less than the preset pressure target value, the operating frequency of the operating water pumps is increased to 50 Hz;

[0017] When the number of operating water pumps is less than 3 and the operating frequencies all reach 50 Hz, if the water supply pressure measured by the pressure sensor is less than the preset pressure target value, one more water pump is added to operate, and the operating frequency of the newly added operating water pump is increased to 50 Hz;

[0018] When the number of operating water pumps is equal to 3 and the operating frequencies all reach 50 Hz, the adjustment of the operating frequency and the number of operating units of the water pump in the first bypass is stopped.

[0019] Preferably, when the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, the adjustment of the operating frequency and the number of operating units of the water pump in the first bypass includes:

[0020] When the number of operating water pumps is greater than 0 and the operating frequencies are all greater than 30 Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, the operating frequencies of the operating water pumps are all reduced to 30 Hz;

[0021] When the number of operating water pumps is greater than 0 and the operating frequencies all reach 30 Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, one water pump is reduced to operate;

[0022] When the number of operating water pumps is equal to 0, the adjustment of the operating frequency and the number of operating units of the water pump in the first bypass is stopped.

[0023] Preferably, a first temperature sensor is arranged on the chiller side of the water inlet pipe to measure the return water temperature of the all-electric energy station;

[0024] When the all-electric energy station interacts with the power grid and the all-electric energy station is in the operation energy storage mode or the operation energy release mode, when the return water temperature of the all-electric energy station measured by the first temperature sensor is greater than the return water temperature target value, the number of operating chillers is increased and / or the load of the operating chillers is increased; when the return water temperature of the all-electric energy station measured by the first temperature sensor is less than the return water temperature target value, the number of operating chillers is decreased and / or the load of the operating chillers is decreased;

[0025] The value range of the return water temperature target value is [5, 7] °C.

[0026] Preferably, a second temperature sensor is arranged on the chiller side of the return water pipe to detect the outlet water temperature of the all-electric energy station;

[0027] When the all-electric energy station interacts with the power grid and the all-electric energy station is in the operation energy storage mode, when the outlet water temperature of the all-electric energy station measured by the second temperature sensor is greater than the outlet water temperature target value, the first electric control valve is closed smaller until it is completely closed; when the outlet water temperature of the all-electric energy station measured by the second temperature sensor is less than the outlet water temperature target value, the first electric control valve is opened larger until it is completely opened;

[0028] When the all-electric energy station interacts with the power grid and the all-electric energy station is in the operation energy release mode, the first electric control valve is closed;

[0029] The value range of the outlet water temperature target value is [4, 6] °C.

[0030] The present invention also proposes an interactive regulation method for the all-electric energy station and the power grid based on pipe network energy storage, including:

[0031] Step 1, when the all-electric energy station does not interact with the power grid, the second electric control valve is closed; when the all-electric energy station interacts with the power grid, the second electric control valve is opened, and the opening degree of the second electric control valve is adjusted according to the relationship between the flow velocity measured by the flow velocity sensor and the preset flow velocity target value;

[0032] Step 2, when the all-electric energy station interacts with the power grid, obtain the cooling load of the all-electric energy station and the total refrigeration power of the power grid;

[0033] Step 3, when the total cooling power of the power grid is greater than the cooling load of the all-electric energy station, it is determined that the all-electric energy station is in the operation energy storage mode; at this time, when the return water temperature of the all-electric energy station measured by the first temperature sensor is greater than the target return water temperature, the number of operating chillers and / or the load of the operating chillers is increased; when the return water temperature of the all-electric energy station measured by the first temperature sensor is less than the target return water temperature, the number of operating chillers and / or the load of the operating chillers is reduced; when the outlet water temperature of the all-electric energy station measured by the second temperature sensor is greater than the target outlet water temperature, the first electric control valve is closed until it is completely closed; when the outlet water temperature of the all-electric energy station measured by the second temperature sensor is less than the target outlet water temperature, the first electric control valve is opened until it is completely opened; according to the relationship between the measured water supply pressure by the pressure sensor and the preset pressure target value, the operating frequency and the number of operating pumps in the first bypass are adjusted; and proceed to Step 5;

[0034] Step 4, when the total cooling power of the power grid is less than the cooling load of the all-electric energy station, it is determined that the all-electric energy station is in the operation energy release mode; at this time, when the return water temperature of the all-electric energy station measured by the first temperature sensor is greater than the target return water temperature, the number of operating chillers and / or the load of the operating chillers is increased; when the return water temperature of the all-electric energy station measured by the first temperature sensor is less than the target return water temperature, the number of operating chillers and / or the load of the operating chillers is reduced; the first electric control valve is closed; and proceed to Step 5;

[0035] Step 5, when the all-electric energy station interacts with the power grid, the second electric control valve is opened, and the opening degree of the second electric control valve is adjusted according to the relationship between the measured flow rate by the flow rate sensor and the preset flow rate target value;

[0036] Step 6, according to the relationship between the measured water supply pressure by the pressure sensor and the preset pressure target value, the operating frequency and the number of operating pumps in the first bypass are adjusted.

[0037] Preferably, in Step 5, the flow rate sensor detects the flow rate of the circulating water in the second bypass. When the measured flow rate by the flow rate sensor is greater than the preset flow rate target value, the opening degree of the second electric control valve is reduced; when the measured flow rate by the flow rate sensor is less than the preset flow rate target value, the opening degree of the second electric control valve is increased;

[0038] The preset flow rate target value includes: a preset energy storage flow rate target value and a preset energy release flow rate target value; in the embodiment, the value range of the preset energy storage flow rate target value is 1 - 2 m / s, and the value range of the preset energy release flow rate target value is 1 - 2 m / s.

[0039] Preferably, Step 6 includes:

[0040] When the water supply pressure measured by the pressure sensor is less than the preset pressure target value, the adjustment of the operating frequency and the number of operating units of the water pump in the first bypass is as follows:

[0041] When the number of operating water pumps is less than 3 and the operating frequency is less than 50 Hz, if the water supply pressure measured by the pressure sensor is less than the preset pressure target value, the operating frequency of the operating water pumps is increased to 50 Hz; when the number of operating water pumps is less than 3 and the operating frequencies all reach 50 Hz, if the water supply pressure measured by the pressure sensor is less than the preset pressure target value, one more water pump is added to operate, and the operating frequency of the newly added operating water pump is increased to 50 Hz; when the number of operating water pumps is equal to 3 and the operating frequencies all reach 50 Hz, the adjustment of the operating frequency and the number of operating units of the water pump in the first bypass is stopped;

[0042] When the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, the adjustment of the operating frequency and the number of operating units of the water pump in the first bypass is as follows:

[0043] When the number of operating water pumps is greater than 0 and the operating frequencies are all greater than 30 Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, the operating frequencies of the operating water pumps are all reduced to 30 Hz; when the number of operating water pumps is greater than 0 and the operating frequencies all reach 30 Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, one water pump is reduced to operate; when the number of operating water pumps is equal to 0, the adjustment of the operating frequency and the number of operating units of the water pump in the first bypass is stopped.

[0044] The beneficial effects of the present invention are at least as follows compared with the prior art. The present invention proposes a regulation method for realizing friendly interaction with the power grid by using the water in the long-distance and large-diameter cold and hot water transmission pipe network commonly existing in the all-electric energy station for energy storage and energy release. This method makes full use of the large-capacity characteristics of the water in the transmission pipe network, realizes the full excavation and utilization of the flexible regulation potential of the all-electric energy station, and provides a basis for the organized participation of the all-electric energy station in the grid interaction. Description of the Drawings

[0045] Figure 1 The present invention proposes an all-electric energy station and grid interaction regulation system based on pipe network energy storage, Figure 1 The descriptions of the reference numerals in the drawings are as follows:

[0046] 1 - First chiller, 2 - Second chiller, 3 - Third chiller;

[0047] 4 - First electric valve, 5 - Second electric valve, 6 - Third electric valve, 7 - Fourth electric valve, 8 - Fifth electric valve, 9 - Sixth electric valve, 19 - Seventh electric valve, 22 - Eighth electric valve, 25 - Ninth electric valve, 28 - nth electric valve;

[0048] 10 - First water pump, 11 - Second water pump, 12 - Third water pump;

[0049] 13 - First check valve, 14 - Second check valve, 15 - Third check valve;

[0050] 16 - First electric control valve, 29 - Second electric control valve;

[0051] 17 - First heat exchange station heat exchanger, 17a - First input end of the first heat exchange station heat exchanger, 17b - First output end of the first heat exchange station heat exchanger, 17c - Second input end of the first heat exchange station heat exchanger, 17d - Second output end of the first heat exchange station heat exchanger;

[0052] 20 - Second heat exchange station heat exchanger, 20a - First input end of the second heat exchange station heat exchanger, 20b - First output end of the second heat exchange station heat exchanger, 20c - Second input end of the second heat exchange station heat exchanger, 20d - Second output end of the second heat exchange station heat exchanger;

[0053] 23 - Third heat exchange station heat exchanger, 23a - First input end of the third heat exchange station heat exchanger, 23b - First output end of the third heat exchange station heat exchanger, 23c - Second input end of the third heat exchange station heat exchanger, 23d - Second output end of the third heat exchange station heat exchanger;

[0054] 26 - nth heat exchange station heat exchanger, 26a - First input end of the nth heat exchange station heat exchanger, 26b - First output end of the nth heat exchange station heat exchanger, 26c - Second input end of the nth heat exchange station heat exchanger, 26d - Second output end of the nth heat exchange station heat exchanger;

[0055] 18 - First heat exchange station water pump, 21 - Second heat exchange station water pump, 24 - Third heat exchange station water pump, 27 - nth heat exchange station water pump;

[0056] 31 - First temperature sensor, 32 - Second temperature sensor, 33 - Third temperature sensor, 34 - Fourth temperature sensor, 35 - Fifth temperature sensor, 36 - Sixth temperature sensor;

[0057] 37 - Pressure sensor; 38 - Flow rate sensor. Detailed implementation mode

[0058] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only a part of the embodiments of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0059] The interaction between the all-electric energy station and the power grid includes two modes. The first mode is the interaction between the all-electric energy station and the power grid for valley filling, green electricity consumption, etc., which is called the energy storage operation mode of the all-electric energy station; the second mode is the interaction between the all-electric energy station and the power grid for peak shaving, etc., which is called the energy release operation mode of the all-electric energy station.

[0060] The present invention proposes an interactive regulation system between an all-electric energy station and a power grid based on pipeline network energy storage. As Figure 1 shown, the all-electric energy station includes multiple chillers. After connecting the multiple chillers in parallel, they are respectively connected to the water inlet pipe and the water return pipe, and multiple heat exchange stations are connected in parallel between the water inlet pipe and the water return pipe;

[0061] In the embodiment, the all-electric energy station includes: the first chiller 1, the second chiller 2, and the third chiller 3. The three chillers are in a parallel connection relationship; among them, the input end of the first chiller is connected to the water inlet pipe through the first electric valve 4, and the output end of the first chiller is connected to the water return pipe through the second electric valve 5. The input end of the second chiller is connected to the water inlet pipe through the third electric valve 6, and the output end of the second chiller is connected to the water return pipe through the fourth electric valve 7. The input end of the third chiller is connected to the water inlet pipe through the fifth electric valve 8, and the output end of the third chiller is connected to the water return pipe through the sixth electric valve 9;

[0062] Furthermore, a first temperature sensor 31 is arranged on the chiller side of the water inlet pipe, and a second temperature sensor 32 is arranged on the chiller side of the water return pipe;

[0063] Each heat exchange station includes a set of heat exchange station plate heat exchanger; in the embodiment, the first input end 17a of the first heat exchange station plate heat exchanger 17 is connected to the water return pipe through the first heat exchange station water pump 18, and the first output end 17b of the first heat exchange station plate heat exchanger 17 is connected to the water inlet pipe through the seventh electric valve 19. The first input end 20a of the second heat exchange station plate heat exchanger 20 is connected to the water return pipe through the second heat exchange station water pump 21, and the first output end 20b of the second heat exchange station plate heat exchanger 20 is connected to the water inlet pipe through the eighth electric valve 22. The first input end 23a of the third heat exchange station plate heat exchanger 23 is connected to the water return pipe through the third heat exchange station water pump 24, and the first output end 23b of the third heat exchange station plate heat exchanger 23 is connected to the water inlet pipe through the ninth electric valve 25,..., the first input end 26a of the nth heat exchange station plate heat exchanger 26 is connected to the water return pipe through the nth heat exchange station water pump 27, and the first output end 26b of the nth heat exchange station plate heat exchanger 26 is connected to the water inlet pipe through the nth electric valve 28;

[0064] Specifically, the interactive regulation system includes: a first bypass and a second bypass;

[0065] The first bypass is arranged in the all-electric energy station. The first bypass includes: a first water pump 10, a second water pump 11, a third water pump 12, a first check valve 13, a second check valve 14, a third check valve 15, and a first electric control valve 16; the output ends of all the chillers are connected to one end of the first electric control valve through a return pipe, the other end of the first electric control valve is respectively connected to one end of the first water pump 10, one end of the second water pump 11, and one end of the third water pump 12, the other end of the first water pump 10 is connected to one end of the first check valve 13, the other end of the second water pump 11 is connected to one end of the second check valve 14, the other end of the third water pump 12 is connected to one end of the third check valve 15, and the other ends of the first check valve 13, the second check valve 14, and the third check valve 15 are connected to the input ends of all the chillers through a feed pipe;

[0066] The second bypass is arranged in the heat exchange station farthest from the chiller; the second bypass includes: a pressure sensor 37, a second electric control valve 29, and a flow rate sensor 38; one end of the second electric control valve is connected to the return pipe, the other end of the second electric control valve is connected to the feed pipe, a pressure sensor is arranged at the connection of one end of the second electric control valve and the return pipe, and a flow rate sensor is arranged at the connection of the other end of the second electric control valve and the feed pipe;

[0067] When the all-electric energy station does not interact with the power grid, the second electric control valve is closed; when the all-electric energy station interacts with the power grid, the second electric control valve is opened; for the regulation system proposed by the present invention, when the all-electric energy station does not interact with the power grid, the second electric control valve is closed, so that the circulating water does not pass through the second bypass, ensuring that in the non-operating energy storage mode and the non-operating energy release mode, the chilled water returns to the all-electric energy station after passing through the heat exchanger plate of the heat exchange station with the maximum water volume.

[0068] When the all-electric energy station interacts with the power grid, the flow rate of the circulating water in the second bypass is detected by the flow rate sensor. When the measured flow rate by the flow rate sensor is greater than the preset flow rate target value, the second electric control valve is closed; when the measured flow rate by the flow rate sensor is less than the preset flow rate target value, the second electric control valve is opened;

[0069] The preset flow rate target value includes: a preset energy storage flow rate target value and a preset energy release flow rate target value; in the embodiment, the value range of the preset energy storage flow rate target value is 1-2 m / s, and the value range of the preset energy release flow rate target value is 1-2 m / s.

[0070] When the all-electric energy station interacts with the power grid, according to the relationship between the measured water supply pressure by the pressure sensor and the preset pressure target value, the operating frequency and the number of operating units of the water pump in the first bypass are adjusted;

[0071] In the embodiment, the value range of the preset pressure target value is the pressure required to ensure that the water flow rate of the heat exchange station farthest from the energy station reaches the design value; the pressure sensor 37 detects the most unfavorable water supply pressure of the heat exchange station farthest from the chiller, and the number of operating units and operating frequencies of the first water pump 10, the second water pump 11, and the third water pump 12 are targeted at the most unfavorable water supply pressure. When the all-electric energy station interacts with the power grid, when the measured water supply pressure of the pressure sensor is less than the preset pressure target value required to ensure the water flow rate of the farthest heat exchange station, according to the relationship between the measured water supply pressure of the pressure sensor and the preset pressure target value, the operating frequency and the number of operating units of the water pump in the first bypass are adjusted, including:

[0072] When the number of operating water pumps is less than 3 and the operating frequency is less than 50 Hz, if the measured water supply pressure of the pressure sensor is less than the preset pressure target value, the operating frequency of the operating water pumps is increased to 50 Hz;

[0073] When the number of operating water pumps is less than 3 and the operating frequencies all reach 50 Hz, if the measured water supply pressure of the pressure sensor is less than the preset pressure target value, one more water pump is added to operate, and the operating frequencies of the newly added operating water pumps are all increased to 50 Hz;

[0074] When the number of operating water pumps is equal to 3 and the operating frequencies all reach 50 Hz, the adjustment of the operating frequency and the number of operating units of the water pump in the first bypass is stopped.

[0075] In the embodiment, when increasing the operating frequency of the currently operating water pumps to 50 Hz still cannot reach the preset pressure target value required to ensure the water flow rate of the farthest heat exchange station, then one more water pump is added to operate, and at the same time, the operating frequencies of all operating water pumps are adjusted to the same frequency until the frequencies of all operating water pumps reach 50 Hz and then one more water pump is added.

[0076] When the pressure measured by the pressure sensor is greater than the preset pressure target value required to ensure the water flow rate of the farthest heat exchange station, the adjustment of the operating frequency and the number of operating units of the water pump in the first bypass includes:

[0077] When the number of operating water pumps is greater than 0 and the operating frequencies are all greater than 30 Hz, if the measured water supply pressure of the pressure sensor is greater than the preset pressure target value, the operating frequencies of the operating water pumps are all reduced to 30 Hz;

[0078] When the number of operating water pumps is greater than 0 and the operating frequencies all reach 30 Hz, if the measured water supply pressure of the pressure sensor is greater than the preset pressure target value, one water pump is reduced from operation;

[0079] When the number of operating water pumps is equal to 0, the adjustment of the operating frequency and the number of operating units of the water pump in the first bypass is stopped.

[0080] In the embodiment, a regulation scheme of reducing the operation frequency and number of water pumps is adopted. The specific scheme is that when reducing the operation frequency of the currently operating water pumps to 30 Hz and it is still greater than the preset pressure target value required to ensure the water flow rate of the farthest heat exchange station, then reduce one more water pump from operation, and at the same time adjust the operation frequencies of all operating water pumps to the same frequency, until after the frequencies of all operating water pumps reach 30 Hz, reduce one more water pump from operation.

[0081] In the present invention, different flow velocities can be achieved by controlling the opening or closing of the second electric control valve. Different preset flow velocity target values can be taken according to the needs of cold storage and cold release. In the embodiment, when the all-electric energy station operates in the energy storage mode, the flow velocity sensor is used to detect the flow velocity to adjust the second electric control valve to ensure that the circulating water flow velocity is not less than the preset flow velocity target value (the range of the flow velocity target setting value is 1 - 2 m / s), so that the circulating water has a relatively high flow velocity. When each heat exchange station in the all-electric energy station is in the open state, or in the shutdown state, or the load increases, or the load decreases during energy storage, it can ensure that the amount of water participating in the cycle in the system pipeline is the largest, thereby making full use of the total amount of circulating water in the pipe network and ensuring the energy storage power. When the all-electric energy station operates in the energy release mode, the flow velocity sensor is used to detect the flow velocity to adjust the second electric control valve to ensure that the circulating water flow velocity is not greater than the preset flow velocity target value (the flow velocity range is 0.1 - 0.2 m / s), so that the circulating water has a relatively low flow velocity. When each heat exchange station in the all-electric energy station is in the open state, or in the shutdown state, or the load increases, or the load decreases during energy release, it can ensure that all the circulating water in the system pipe network can circulate, and the cold stored in the circulating water can be utilized and released, while minimizing the direct mixing of the circulating water in the supply pipe and the return pipe of the energy station as much as possible.

[0082] A first temperature sensor is arranged on the side of the chiller of the water inlet pipe for measuring the return water temperature of the all-electric energy station;

[0083] When the all-electric energy station interacts with the power grid and the all-electric energy station is in the operation energy storage mode or the operation energy release mode, when the return water temperature of the all-electric energy station measured by the first temperature sensor is greater than the return water temperature target value, then increase the number of operating chillers and / or increase the load of the operating chillers; when the return water temperature of the all-electric energy station measured by the first temperature sensor is less than the return water temperature target value, then reduce the number of operating chillers and / or reduce the load of the operating chillers;

[0084] In the embodiment, the value range of the return water temperature target value of the all-electric energy station is [5, 7] °C.

[0085] A second temperature sensor is arranged on the side of the chiller of the return water pipe for detecting the outlet water temperature of the all-electric energy station;

[0086] When the all-electric energy station interacts with the power grid and the all-electric energy station is in the operation energy storage mode, when the outlet water temperature of the all-electric energy station measured by the second temperature sensor is greater than the outlet water temperature target value, the first electric control valve is closed gradually until it is completely closed; when the outlet water temperature of the all-electric energy station measured by the second temperature sensor is less than the outlet water temperature target value, the first electric control valve is opened gradually until it is completely opened; when the all-electric energy station interacts with the power grid and the all-electric energy station is in the operation energy release mode, the first electric control valve is closed.

[0087] In the embodiment, the value range of the outlet water temperature target value of the all-electric energy station is [4, 6] °C.

[0088] The present invention also proposes an interactive regulation method for the all-electric energy station and the power grid based on pipe network energy storage, including:

[0089] Step 1, when the all-electric energy station does not interact with the power grid, the second electric control valve is closed; when the all-electric energy station interacts with the power grid, the second electric control valve is opened, and the opening degree of the second electric control valve is adjusted according to the relationship between the flow rate measured by the flow rate sensor and the preset flow rate target value.

[0090] Step 2, when the all-electric energy station interacts with the power grid, obtain the cooling load of the all-electric energy station and the total cooling power of the power grid.

[0091] Step 3, when the total cooling power of the power grid is greater than the cooling load of the all-electric energy station, it is determined that the all-electric energy station is in the operation energy storage mode; at this time, when the return water temperature of the all-electric energy station measured by the first temperature sensor is greater than the return water temperature target value, the number of operating chillers and / or the load of the operating chillers is increased; when the return water temperature of the all-electric energy station measured by the first temperature sensor is less than the return water temperature target value, the number of operating chillers and / or the load of the operating chillers is reduced; when the outlet water temperature of the all-electric energy station measured by the second temperature sensor is greater than the outlet water temperature target value, the first electric control valve is closed gradually until it is completely closed; when the outlet water temperature of the all-electric energy station measured by the second temperature sensor is less than the outlet water temperature target value, the first electric control valve is opened gradually until it is completely opened; according to the relationship between the water supply pressure measured by the pressure sensor and the preset pressure target value, the operating frequency and the number of operating pumps in the first bypass are adjusted; and enter step 5.

[0092] Step 4, when the total cooling power of the power grid is less than the cooling load of the all-electric energy station, it is determined that the all-electric energy station is in the operation and energy release mode; at this time, when the return water temperature of the all-electric energy station measured by the first temperature sensor is greater than the target return water temperature, the number of operating chillers and / or the load of the operating chillers is increased; when the return water temperature of the all-electric energy station measured by the first temperature sensor is less than the target return water temperature, the number of operating chillers and / or the load of the operating chillers is reduced; the first electric control valve is closed; and it enters Step 5;

[0093] Step 5, when the all-electric energy station interacts with the power grid, the second electric control valve is opened, and the opening degree of the second electric control valve is adjusted according to the relationship between the flow rate measured by the flow rate sensor and the preset flow rate target value;

[0094] In Step 5, the flow rate sensor detects the flow rate of the circulating water in the second bypass. When the flow rate measured by the flow rate sensor is greater than the preset flow rate target value, the opening degree of the second electric control valve is reduced; when the flow rate measured by the flow rate sensor is less than the preset flow rate target value, the opening degree of the second electric control valve is increased;

[0095] Step 6, according to the relationship between the water supply pressure measured by the pressure sensor and the preset pressure target value, the operating frequency and the number of operating pumps in the first bypass are adjusted.

[0096] In Step 6,

[0097] When the water supply pressure measured by the pressure sensor is less than the preset pressure target value, the adjustment of the operating frequency and the number of operating pumps in the first bypass includes:

[0098] When the number of operating pumps is less than 3 and the operating frequency is less than 50 Hz, if the water supply pressure measured by the pressure sensor is less than the preset pressure target value, the operating frequency of the operating pumps is increased to 50 Hz; when the number of operating pumps is less than 3 and the operating frequencies all reach 50 Hz, if the water supply pressure measured by the pressure sensor is less than the preset pressure target value, one more pump is added to operate, and the operating frequency of the newly added operating pump is raised to 50 Hz; when the number of operating pumps is equal to 3 and the operating frequencies all reach 50 Hz, the adjustment of the operating frequency and the number of operating pumps in the first bypass is stopped;

[0099] When the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, the adjustment of the operating frequency and the number of operating pumps in the first bypass includes:

[0100] When the number of operating water pumps is greater than 0 and the operating frequencies are all greater than 30 Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, the operating frequencies of the operating water pumps are all reduced to 30 Hz; when the number of operating water pumps is greater than 0 and the operating frequencies all reach 30 Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, then one water pump is stopped from operating; when the number of operating water pumps is equal to 0, the adjustment of the operating frequency and the number of operating units of the water pump in the first bypass is stopped.

[0101] In the embodiment, the total power generation of the power grid is greater than the cooling load of the all-electric energy station, and the power consumption of the all-electric energy station increases. When the all-electric energy station operates in the energy storage mode, the first chiller 1, the second chiller 2, and the third chiller 3 operate with increased capacity while undertaking the normal cooling load of the all-electric energy station. Using the large-capacity circulating water in the pipeline network of the all-electric energy station as the medium, the temperature of the circulating water in the power grid circulating pipeline network is reduced, and more electric energy is consumed to achieve the storage of cooling capacity. The specific process of this mode is as follows:

[0102] After the circulating water of the energy station returns from the off-site pipe network, it is divided into three paths and enters the first water pump 10, the second water pump 11, and the third water pump 12 respectively (the number of water pumps and their frequencies are adjusted according to actual needs). Then, the circulating water passes through the first check valve 13, the second check valve 14, and the third check valve 15 respectively and then converges. After convergence, the circulating water is divided into three paths again and enters the first chiller 1, the second chiller 2, and the third chiller 3 through the first electric valve 4, the third electric valve 6, and the fifth electric valve 8 respectively. The circulating water from each path flows out of the first chiller 1, the second chiller 2, and the third chiller 3 respectively and then converges through the second electric valve 5, the fourth electric valve 7, and the sixth electric valve 9. When the first electric control valve 16 is opened, the converged circulating water is divided into two paths. One path enters the input end of the third water pump 12 through the first electric control valve 16, and the other path flows out of the energy station and enters each heat exchange station and the second electric control valve 29 respectively. In the first heat exchange station, the circulating water enters the first heat exchange station water pump 18, is pressurized and then flows out and enters the first input end 17a of the first heat exchange station plate heat exchanger. The circulating water exchanges heat with the chilled water in the building corresponding to the first heat exchange station plate heat exchanger 17 in the first heat exchange station plate heat exchanger 17, releases the cold quantity to the chilled water, and then the temperature of the circulating water itself rises and it flows out through the seventh electric valve 19. In the second heat exchange station, the circulating water enters the second heat exchange station water pump 21, is pressurized and then flows out and enters the first input end 20a of the second heat exchange station plate heat exchanger. The circulating water exchanges heat with the chilled water in the building corresponding to the second heat exchange station plate heat exchanger 20 in the second heat exchange station plate heat exchanger 20, releases the cold quantity to the chilled water, and then the temperature of the circulating water itself rises and it flows out through the eighth electric valve 22. In the third heat exchange station, the circulating water enters the third heat exchange station water pump 24, is pressurized and then flows out and enters the first input end 23a of the third heat exchange station plate heat exchanger. The circulating water exchanges heat with the chilled water in the building corresponding to the third heat exchange station plate heat exchanger 23 in the third heat exchange station plate heat exchanger 23, releases the cold quantity to the chilled water, and then the temperature of the circulating water itself rises and it flows out through the ninth electric valve 25. In the nth heat exchange station, the circulating water enters the nth heat exchange station water pump 27, is pressurized and then flows out and enters the first input end 26a of the nth heat exchange station plate heat exchanger. The circulating water exchanges heat with the chilled water in the building corresponding to the nth heat exchange station plate heat exchanger 26 in the nth heat exchange station plate heat exchanger 26, releases the cold quantity to the chilled water, and then the temperature of the circulating water itself rises and it flows out through the nth electric valve 28. After the circulating water enters the second electric control valve 29, it flows out after pressure reduction. The circulating water flowing out of the seventh electric valve 19, the eighth electric valve 22, the ninth electric valve 25, the nth electric valve 28, and the second electric control valve 29 converges and then returns to flow into the energy station.

[0103] In the energy storage mode of the all-electric energy station operation, the return water temperature of the energy station is detected by the first temperature sensor 31. The number of operating units of the first chiller 1, the second chiller 2, and the third chiller 3 and the load increase and decrease control of the units are targeted at the return water temperature of the energy station detected by the first temperature sensor 31. When the return water temperature of the energy station is higher than the target set value of the return water temperature (the target set value range is 5-7 °C), the chiller itself loads or increases the number of operating units. When the return water temperature of the energy station is lower than the target set value, the chiller itself unloads or reduces the number of operating units. The outlet water temperature of the energy station is detected by the second temperature sensor 32. The first electric control valve 16 is targeted at the outlet water temperature of the energy station detected by the second temperature sensor 32. When it is higher than the outlet target set value (the outlet target set value range is 4-6 °C), the first electric control valve 16 closes slightly until it is completely closed. When it is lower than the outlet target set value, the first electric control valve 16 opens wide until it is completely open. The first pressure sensor 37 detects the most unfavorable water supply pressure at the farthest end of the energy station. The number of operating units and the operating frequency of the first water pump 10, the second water pump 11, and the third water pump 12 are targeted at the most unfavorable water supply pressure at the farthest end of the energy station. When the pressure measured by the first pressure sensor 37 is lower than the pressure target set value, the number of operating units and the operating frequency of the first water pump 10, the second water pump 11, and the third water pump 12 are increased. When the pressure measured by the first pressure sensor 37 is higher than the pressure target set value, the number of operating units and the operating frequency of the first water pump 10, the second water pump 11, and the third water pump 12 are reduced. The second electric control valve 29 is targeted at the circulating water flow rate detected by the first speed sensor 38. When the circulating water flow rate is higher than the flow rate target set value (the flow rate target set value range is 1-2 m / s), the second electric control valve 29 is closed slightly. When the circulating water flow rate is lower than the target set value, the second electric control valve 29 is opened wide.

[0104] When the all-electric energy station operates in the energy release mode: The first chiller 1, the second chiller 2, and the third chiller 3 operate with reduced capacity (reducing the total system refrigeration power to achieve peak shaving of the energy station's electricity consumption), using the large-capacity circulating water in the all-electric energy station pipe network as the medium to increase the water temperature of the circulating water in the system circulating pipe network and release the cold energy stored in the circulating water to achieve energy release. The specific process includes:

[0105] After the circulating water of the energy station returns from the off-station pipe network, it is divided into three paths and enters the first water pump 10, the second water pump 11, and the third water pump 12 respectively (the number of water pumps and their frequencies to be started are determined according to actual needs). Then, the circulating water passes through the first check valve 13, the second check valve 14, and the third check valve 15 respectively and then converges. After convergence, the circulating water is divided into three paths again and enters the first chiller 1, the second chiller 2, and the third chiller 3 through the first electric valve 4, the third electric valve 6, and the fifth electric valve 8 respectively (the number of chillers to be started is determined according to the need for peak shaving). The circulating water flowing out from the first chiller 1, the second chiller 2, and the third chiller 3 converges after passing through the second electric valve 5, the fourth electric valve 7, and the sixth electric valve 9 respectively. At this time, the first electric control valve 16 is closed, and the circulating water flows out of the energy station and enters each heat exchange station and the second electric control valve 29 respectively. In the first heat exchange station, the circulating water enters the first heat exchange station water pump 18, is pressurized and then flows out and enters the first input end 17a of the first heat exchange station plate heat exchanger. The circulating water exchanges heat with the chilled water in the building corresponding to the first heat exchange station plate heat exchanger 17 in the first heat exchange station plate heat exchanger 17, releases the cold quantity to the chilled water, and then the temperature of the circulating water itself rises and it flows out through the seventh electric valve 19; in the second heat exchange station, the circulating water enters the second heat exchange station water pump 21, is pressurized and then flows out and enters the first input end 20a of the second heat exchange station plate heat exchanger. The circulating water exchanges heat with the chilled water in the building corresponding to the second heat exchange station plate heat exchanger 20 in the second heat exchange station plate heat exchanger 20, releases the cold quantity to the chilled water, and then the temperature of the circulating water itself rises and it flows out through the eighth electric valve 22; in the third heat exchange station, the circulating water enters the third heat exchange station water pump 24, is pressurized and then flows out and enters the first input end 23a of the third heat exchange station plate heat exchanger. The circulating water exchanges heat with the chilled water in the building corresponding to the third heat exchange station plate heat exchanger 23 in the third heat exchange station plate heat exchanger 23, releases the cold quantity to the chilled water, and then the temperature of the circulating water itself rises and it flows out through the ninth electric valve 25; in the nth heat exchange station, the circulating water enters the nth heat exchange station water pump 27, is pressurized and then flows out and enters the first input end 26a of the nth heat exchange station plate heat exchanger. The circulating water exchanges heat with the chilled water in the building corresponding to the nth heat exchange station plate heat exchanger 26 in the nth heat exchange station plate heat exchanger 26, releases the cold quantity to the chilled water, and then the temperature of the circulating water itself rises and it flows out through the nth electric valve 28; after the circulating water enters the second electric control valve 29, it flows out after pressure reduction. The circulating water flowing out from the seventh electric valve 19, the eighth electric valve 22, the ninth electric valve 25, the nth electric valve 28, and the second electric control valve 29 converges and then returns to flow into the energy station.

[0106] In the energy release mode of the all-electric energy station, the return water temperature of the energy station is detected by the first temperature sensor 31, and the target return water temperature in the energy release mode is set (the temperature range of the target return water temperature is 12-15°C). The number of operating units of the first chiller 1, the second chiller 2, and the third chiller 3 and the load increase and decrease control of the units are targeted at the return water temperature of the energy station detected by the first temperature sensor 31. When the return water temperature of the energy station is higher than the target set value in the energy release mode (indicating that the energy release ends at this time), the chiller itself loads or increases the number of operating units. When the return water temperature of the energy station is lower than the target set value, the chiller itself unloads or reduces the number of operating units. The first pressure sensor 31 detects the most unfavorable water supply pressure at the farthest end of the energy station. The number of operating units and the operating frequency of the first water pump 10, the second water pump 11, and the third water pump 12 are targeted at the most unfavorable water supply pressure at the farthest end of the energy station. When the pressure is lower than the target set value, the number of operating units and the operating frequency of the first water pump 10, the second water pump 11, and the third water pump 12 are increased. When the pressure is higher than the target set value, the number of operating units and the operating frequency of the first water pump 10, the second water pump 11, and the third water pump 12 are reduced. The second electric control valve 29 is targeted at the circulating water flow velocity detected by the first velocity sensor 38. When the circulating water flow velocity is higher than the target set value of the energy release flow velocity (the flow velocity range is 0.1-0.2 m / s), the second electric control valve 29 is closed. When the circulating water flow velocity is lower than the target set value, the second electric control valve 29 is opened wide.

[0107] When the all-electric energy station is in the non-operating energy storage mode and the energy release mode, the second electric control valve 29 is closed, and the circulating water does not bypass through the second electric control valve 29. When the energy storage mode is in operation, the second electric control valve 29 is opened to ensure that the circulating water detected by the first velocity sensor 38 has a relatively high flow velocity (ensuring that there is sufficient circulating water volume for energy storage at any time in the system), so as to ensure that no matter whether the heat exchange stations of the energy station are opened or the load size, the circulating water volume participating in energy storage is the largest when energy storage is carried out, so as to make full use of the total circulating water volume in the pipe network and ensure the energy storage power. When the energy release mode is in operation, the second electric control valve 29 is opened to ensure that the circulating water detected by the first velocity sensor 38 has a relatively low flow velocity, so as to ensure that no matter whether the heat exchange stations of the energy station are opened or the load size, when energy release is carried out, all the circulating water in the pipe network can circulate, and the cold energy stored in the circulating water can be utilized and released, while minimizing the direct mixing of the circulating water in the supply pipe and the return pipe of the energy station as much as possible.

[0108] The outlet water temperature of the secondary side of the heat exchange plate in each heat exchange station is detected by the corresponding temperature sensor and regulated by changing the frequency of the water pump in the corresponding heat exchange station, so as to ensure the stability of the outlet water temperature of the secondary side of the heat exchange plate and meet the cooling demand of the building corresponding to the heat exchange station.

[0109] In the embodiment, the chilled water in the first chiller 1, the second chiller 2, and the third chiller 3 can vary in flow rate within a wide range, and the range of flow rate variation is [30%, 100%]. The temperature difference between the inlet and outlet of the chilled water can vary within a wide range, and the variation range is [1, 8] °C. The smaller the temperature difference between the inlet and outlet of the chilled water allowed by the chiller, the greater the cooling capacity that can be stored in the circulating water in the energy station pipeline network.

[0110] The first water pump 10, the second water pump 11, the third water pump 12, the first heat exchange station water pump 18, the second heat exchange station water pump 21, the third heat exchange station water pump 24, and the nth heat exchange station water pump 27 are all variable-frequency water pumps.

[0111] The regulation system and method proposed by the present invention, based on the establishment of a dynamic simulation model of the distribution pipeline network, predict the building user load, calculate the energy storage and peak regulation capacity of the pipeline network, and optimize the operation strategy model of the all-electric energy station. Finally, according to the grid interaction incentive policy, an all-electric energy station and power grid friendly interaction regulation strategy method is formed with the goal of maximizing the energy station's revenue. Without affecting user comfort, it meets the grid's peak regulation, emergency and other interaction requirements. While increasing the revenue of the all-electric energy station, it improves the flexible regulation ability of the local power grid, ensures grid safety, and at the same time maximizes the energy station's revenue while ensuring grid operation safety and increasing the grid's green capacitance acceptance ratio.

[0112] The present disclosure may be a system, method, and / or computer program product. The computer program product may include a computer-readable storage medium having thereon computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0113] The computer-readable storage medium may be a tangible device that can retain and store instructions for use by an instruction execution device. The computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (non-exhaustive list) of the computer-readable storage medium include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital versatile disc (DVD), memory stick, floppy disk, mechanical encoding device, such as a punched card or raised structure in a groove having instructions stored thereon, and any suitable combination of the foregoing. The computer-readable storage medium used herein is not construed as an instantaneous signal itself, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through an optical fiber cable), or electrical signals transmitted through wires.

[0114] The computer-readable program instructions described herein can be downloaded to various computing / processing devices from a computer-readable storage medium or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network may include copper transmission cables, optical fiber transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in each computing / processing device.

[0115] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state-setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages such as Smalltalk, C++, etc., and conventional procedural programming languages such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via an Internet service provider through the Internet). In some embodiments, by using the state information of the computer-readable program instructions to customize an electronic circuit, such as a programmable logic circuit, a field-programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit can execute the computer-readable program instructions to implement various aspects of the present disclosure.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent substitutions can still be made to the specific embodiments of the present invention, and any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A full-electric energy station and power grid interactive regulation system based on pipe network energy storage. The full-electric energy station includes multiple chillers. After the multiple chillers are connected in parallel, they are respectively connected to the water inlet pipe and the water return pipe. A plurality of heat exchange stations are connected in parallel between the water inlet pipe and the water return pipe. Each heat exchange station includes a set of heat exchange station heat exchanger; characterized in that, Including: A first bypass and a second bypass; The first bypass is arranged in the all-electric energy station. The first bypass includes: a first water pump, a second water pump, a third water pump, a first check valve, a second check valve, a third check valve, and a first electric control valve; the output ends of all the chillers are connected to one end of the first electric control valve through a return pipe, and the other end of the first electric control valve is respectively connected to one end of the first water pump, one end of the second water pump, and one end of the third water pump. The other end of the first water pump is connected to one end of the first check valve, the other end of the second water pump is connected to one end of the second check valve, and the other end of the third water pump is connected to one end of the third check valve. The other ends of the first check valve, the second check valve, and the third check valve are connected to the input ends of all the chillers through a feed pipe; The second bypass is arranged in the heat exchange station farthest from the chiller; the second bypass includes: a pressure sensor, a second electric control valve, and a flow rate sensor; one end of the second electric control valve is connected to the return pipe, and the other end of the second electric control valve is connected to the feed pipe. A pressure sensor is arranged at the connection of one end of the second electric control valve and the return pipe, and a flow rate sensor is arranged at the connection of the other end of the second electric control valve and the feed pipe; When the all-electric energy station does not interact with the power grid, the second electric control valve is closed; when the all-electric energy station interacts with the power grid, the second electric control valve is opened, and the opening degree of the second electric control valve is adjusted according to the relationship between the flow rate measured by the flow rate sensor and the preset flow rate target value; When the all-electric energy station interacts with the power grid, the operating frequency and the number of operating units of the water pumps in the first bypass are adjusted according to the relationship between the measured water supply pressure by the pressure sensor and the preset pressure target value.

2. The all-electric energy station and power grid interaction regulation system based on pipe network energy storage according to claim 1, wherein When the all-electric energy station interacts with the power grid, the flow rate sensor detects the flow rate of the circulating water in the second bypass. When the flow rate measured by the flow rate sensor is greater than the preset flow rate target value, the opening degree of the second electric control valve is reduced; when the flow rate measured by the flow rate sensor is less than the preset flow rate target value, the opening degree of the second electric control valve is increased.

3. The all-electric energy station and power grid interaction regulation system based on pipe network energy storage according to claim 2, wherein The preset flow rate target value includes: a preset chilled water storage flow rate target value and a preset chilled water release flow rate target value; the value range of the preset chilled water storage flow rate target value is 1-2 m / s, and the value range of the preset chilled water release flow rate target value is 1-2 m / s.

4. The all-electric energy station and power grid interaction regulation system based on pipe network energy storage according to claim 2, wherein When the measured water supply pressure by the pressure sensor is less than the preset pressure target value, the adjustment of the operating frequency and the number of operating units of the water pumps in the first bypass includes: When the number of operating water pumps is less than 3 and the operating frequency is less than 50 Hz, if the measured water supply pressure by the pressure sensor is less than the preset pressure target value, the operating frequency of the operating water pumps is increased to 50 Hz; When the number of operating water pumps is less than 3 and the operating frequencies all reach 50 Hz, if the water supply pressure measured by the pressure sensor is less than the preset pressure target value, then add one more water pump to operate and increase the operating frequency of the newly added operating water pump to 50 Hz; When the number of operating water pumps is equal to 3 and the operating frequencies all reach 50 Hz, then stop adjusting the operating frequency and the number of operating units of the water pumps in the first bypass.

5. The interactive regulation and control system between the all-electric energy station based on pipe network energy storage and the power grid according to claim 2, characterized in that When the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, the adjustment of the operating frequency and the number of operating units of the water pumps in the first bypass includes: When the number of operating water pumps is greater than 0 and the operating frequencies are all greater than 30 Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, then the operating frequencies of the operating water pumps are all reduced to 30 Hz; When the number of operating water pumps is greater than 0 and the operating frequencies all reach 30 Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, then reduce one water pump from operation; When the number of operating water pumps is equal to 0, then stop adjusting the operating frequency and the number of operating units of the water pumps in the first bypass.

6. The interactive regulation and control system between the all-electric energy station based on pipe network energy storage and the power grid according to claim 1, characterized in that A first temperature sensor is arranged on the side of the chiller of the water inlet pipe for measuring the return water temperature of the all-electric energy station; When the all-electric energy station interacts with the power grid and the all-electric energy station is in the operation energy storage mode or the operation energy release mode, when the return water temperature of the all-electric energy station measured by the first temperature sensor is greater than the return water temperature target value, then increase the number of operating chillers and / or increase the load of the operating chillers; when the return water temperature of the all-electric energy station measured by the first temperature sensor is less than the return water temperature target value, then reduce the number of operating chillers and / or reduce the load of the operating chillers; The value range of the return water temperature target value is [5, 7] °C.

7. The interactive regulation and control system between the all-electric energy station based on pipe network energy storage and the power grid according to claim 1, characterized in that A second temperature sensor is arranged on the side of the chiller of the water return pipe for detecting the outlet water temperature of the all-electric energy station; When the all-electric energy station interacts with the power grid and the all-electric energy station is in the operation energy storage mode, when the outlet water temperature of the all-electric energy station measured by the second temperature sensor is greater than the outlet water temperature target value, then close the first electric control valve until it is completely closed; when the outlet water temperature of the all-electric energy station measured by the second temperature sensor is less than the outlet water temperature target value, then open the first electric control valve until it is completely opened; When the all-electric energy station interacts with the power grid and the all-electric energy station is in the operation energy release mode, the first electric control valve is closed; The value range of the outlet water temperature target value is [4, 6] °C.

8. A method for interactive regulation and control of an all-electric energy station based on pipe network energy storage and the power grid according to any one of claims 1-7, characterized in that, Including: Step 1, when the all-electric energy station is not interacting with the power grid, the second electric control valve is closed; When the all-electric energy station interacts with the power grid, the second electric control valve is opened, and the opening degree of the second electric control valve is adjusted according to the relationship between the flow rate measured by the flow rate sensor and the preset flow rate target value; Step 2: When the all-electric energy station interacts with the power grid, obtain the cooling load of the all-electric energy station and the total cooling power of the power grid. Step 3: When the total cooling power of the power grid is greater than the cooling load of the all-electric energy station, it is determined that the all-electric energy station is in the operation energy storage mode. At this time, when the return water temperature of the all-electric energy station measured by the first temperature sensor is greater than the return water temperature target value, increase the number of operating chillers and / or increase the load of the operating chillers; when the return water temperature of the all-electric energy station measured by the first temperature sensor is less than the return water temperature target value, reduce the number of operating chillers and / or reduce the load of the operating chillers; when the outlet water temperature of the all-electric energy station measured by the second temperature sensor is greater than the outlet water temperature target value, close the first electric control valve until it is completely closed; when the outlet water temperature of the all-electric energy station measured by the second temperature sensor is less than the outlet water temperature target value, open the first electric control valve until it is completely opened; adjust the operating frequency and number of pumps in the first bypass according to the relationship between the water supply pressure measured by the pressure sensor and the preset pressure target value. And enter Step 5. Step 4: When the total cooling power of the power grid is less than the cooling load of the all-electric energy station, it is determined that the all-electric energy station is in the operation energy release mode. At this time, when the return water temperature of the all-electric energy station measured by the first temperature sensor is greater than the return water temperature target value, increase the number of operating chillers and / or increase the load of the operating chillers; when the return water temperature of the all-electric energy station measured by the first temperature sensor is less than the return water temperature target value, reduce the number of operating chillers and / or reduce the load of the operating chillers; the first electric control valve is closed. And enter Step 5. Step 5: When the all-electric energy station interacts with the power grid, the second electric control valve is opened, and the opening degree of the second electric control valve is adjusted according to the relationship between the flow velocity measured by the flow velocity sensor and the preset flow velocity target value. Step 6: Adjust the operating frequency and number of pumps in the first bypass according to the relationship between the water supply pressure measured by the pressure sensor and the preset pressure target value.

9. The interactive regulation method between the all-electric energy station based on pipe network energy storage and the power grid according to claim 8, characterized in that In Step 5, the flow velocity sensor detects the flow velocity of the circulating water in the second bypass. When the flow velocity measured by the flow velocity sensor is greater than the preset flow velocity target value, the opening degree of the second electric control valve is reduced; when the flow velocity measured by the flow velocity sensor is less than the preset flow velocity target value, the opening degree of the second electric control valve is increased. The preset flow velocity target values include: a preset energy storage flow velocity target value and a preset energy release flow velocity target value; the value range of the preset energy storage flow velocity target value is 1 - 2 m / s, and the value range of the preset energy release flow velocity target value is 1 - 2 m / s.

10. The interactive regulation method between the all-electric energy station based on pipe network energy storage and the power grid according to claim 8, characterized in that Step 6 includes: When the water supply pressure measured by the pressure sensor is less than the preset pressure target value, the adjustment of the operating frequency and number of pumps in the first bypass is as follows: When the number of running water pumps is less than 3 and the running frequency is less than 50 Hz, if the water supply pressure measured by the pressure sensor is less than the preset pressure target value, the running frequency of the running water pumps is increased to 50 Hz; when the number of running water pumps is less than 3 and the running frequencies all reach 50 Hz, if the water supply pressure measured by the pressure sensor is less than the preset pressure target value, one more water pump is added to run, and the running frequency of the newly added running water pump is increased to 50 Hz; when the number of running water pumps is equal to 3 and the running frequencies all reach 50 Hz, the adjustment of the running frequency and the number of running units of the water pump in the first bypass is stopped. When the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, the adjustment of the running frequency and the number of running units of the water pump in the first bypass is as follows: When the number of running water pumps is greater than 0 and the running frequencies are all greater than 30 Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, the running frequencies of the running water pumps are all reduced to 30 Hz; when the number of running water pumps is greater than 0 and the running frequencies all reach 30 Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, one water pump is stopped from running; when the number of running water pumps is equal to 0, the adjustment of the running frequency and the number of running units of the water pump in the first bypass is stopped.

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