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

Abstract

The invention discloses an all-electric energy station and power grid interactive regulation and control system and method based on pipe network energy storage. The regulation and control system comprises a first bypass and a second bypass; the first bypass is arranged in the full-electric energy station and comprises a first water pump, a second water pump, a third water pump, a first one-way valve, a second one-way valve, a third one-way valve and a first electric control valve; the second bypass is arranged in the heat exchange station farthest from the water chilling unit and comprises a pressure sensor, a second electric control valve and a flow velocity sensor; when the all-electric energy station does not interact with the power grid, the second electric control valve is closed; when the full-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 relation between the flow velocity measured by the flow velocity sensor and a preset flow velocity target value; when the full-electric energy station interacts with the power grid, the operation frequency and the operation number of the water pumps in the first bypass are adjusted according to the relation between the water supply pressure measured by the pressure sensor and the preset pressure target value. The interaction capability between the energy station and the power grid is improved.

Description

Technical Field

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

[0002] With the continuous improvement of living standards, people's requirements for the comfort of building thermal environment are constantly increasing. As a result, the energy consumption of air-conditioning systems that create building thermal environment is also rising, and the total energy consumption of buildings is also increasing sharply. In the high temperature period in summer and the cold period in winter, the power load of air-conditioning systems that create a comfortable thermal environment in buildings accounts for more than 30%-40% of the total peak load of the 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 intermittent and unstable nature of renewable energy, the volatility of power supply in the power grid has increased, and the difficulty of regulation 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 regional buildings with a large area. It has the advantages of reducing the total installed capacity of equipment, improving equipment utilization efficiency and system energy efficiency, and reducing carbon emissions. Due to the lag and large fluctuations in building cooling load and the pipe network characteristics of the all-electric energy station that realizes cooling and heating in a large area, the all-electric energy station is an electricity terminal with great flexible regulation potential for the power grid. How to fully tap the load characteristics and energy storage characteristics of the all-electric energy station, and ensure the safety of the new power grid, increase the proportion of green electricity in the power grid, reduce the carbon emissions of the energy station, and maximize the benefits of the all-electric energy station through friendly interaction between the all-electric energy station and the power grid while ensuring the thermal comfort of users has become an urgent problem to be solved in the industry.

[0004] Therefore, how to make full use of the energy storage characteristics of the pipeline network in the all-electric energy station, solve the bottleneck problems such as the limited total amount of circulating water participating in the energy station pipeline energy storage, low utilization rate, and small temperature difference of circulating water energy storage, and design a new and efficient all-electric energy station system that can achieve friendly interaction with the power grid has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

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

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

[0007] The present invention proposes an interactive control system of an all-electric energy station and a power grid based on pipe network energy storage. The all-electric energy station includes multiple chillers, which are connected in parallel to the water inlet pipe and the water return pipe respectively. Multiple heat exchange stations are connected in parallel between the water inlet pipe and the water return pipe, and each heat exchange station includes a set of heat exchange station plate exchange; including:

[0008] A first bypass and a second bypass;

[0009] The first bypass is arranged in the all-electric energy station, and the first bypass includes: a first water pump, a second water pump, a third water pump, a first one-way valve, a second one-way valve, a third one-way valve, and a first electric regulating valve; the output ends of all chillers are connected to one end of the first electric regulating valve through a return pipe, and the other end of the first electric regulating 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 one-way valve, the other end of the second water pump is connected to one end of the second one-way valve, the other end of the third water pump is connected to one end of the third one-way valve, and the other end of the first one-way valve, the other end of the second one-way valve, and the other end of the third one-way valve are connected to the input ends of all chillers through a water 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 regulating valve, and a flow rate sensor; one end of the second electric regulating valve is connected to the return pipe, and the other end of the second electric regulating valve is connected to the water inlet pipe, a pressure sensor is arranged at the connection between one end of the second electric regulating valve and the return pipe, and a flow rate sensor is arranged at the connection between the other end of the second electric regulating valve and the water inlet pipe;

[0011] When the all-electric energy station does not interact with the power grid, the second electric regulating valve is closed; when the all-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;

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

[0013] Preferably, 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 regulating 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 regulating valve is increased.

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

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

[0016] When the number of running water pumps is less than 3 and the running frequency is less than 50Hz, 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 pump is increased to 50Hz;

[0017] When the number of running water pumps is less than 3 and the running frequency reaches 50Hz, if the water supply pressure measured by the pressure sensor is less than the preset pressure target value, an additional water pump is added to run, and the running frequency of the newly added water pump is increased to 50Hz;

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

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

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

[0021] When the number of running water pumps is greater than 0 and the operating frequency reaches 30Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, one water pump will be reduced;

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

[0023] Preferably, a first temperature sensor is provided 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 an energy storage mode or an 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 reduced and / or the load of the operating chillers is reduced;

[0025] The return water temperature target value range is [5,7]℃.

[0026] Preferably, a second temperature sensor is provided on the chiller side of the return 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 and 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 regulating 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 outlet water temperature target value, the first electric regulating valve is opened until it is fully 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 regulating valve is closed;

[0029] The target value of the outlet water temperature ranges from [4,6]℃.

[0030] The present invention also proposes a method for interactively controlling an all-electric energy station and a power grid based on pipeline network energy storage, comprising:

[0031] Step 1: When the all-electric energy station does not interact with the power grid, the second electric regulating valve is closed; when the all-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;

[0032] Step 2: When the all-electric energy station interacts with the power grid, the cooling load of the all-electric energy station and the total cooling power of the power grid are obtained;

[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 and 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 are 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 are 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 regulating 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 outlet water temperature target value, the first electric regulating valve is opened until it is fully 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 step 5 is entered;

[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 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, the number of operating chillers and / or the load of the operating chillers are 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 are reduced; the first electric regulating valve is closed; and the process goes to step 5;

[0035] Step 5, when the all-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;

[0036] 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 water 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, and 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 regulating 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 regulating valve is increased;

[0038] The preset flow rate target values ​​include: a preset cold storage flow rate target value and a preset cold release flow rate target value; in the embodiment, the preset cold storage flow rate target value has a value range of 1 to 2 m / s, and the preset cold release flow rate target value has a value range of 1 to 2 m / s.

[0039] Preferably, step 6 comprises:

[0040] When the water supply pressure measured by the pressure sensor is lower than the preset pressure target value, the operating frequency and number of the water pumps in the first bypass are adjusted as follows:

[0041] When the number of running water pumps is less than 3 and the running frequency is less than 50Hz, 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 pump is increased to 50Hz; when the number of running water pumps is less than 3 and the running frequency reaches 50Hz, 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 water pump is increased to 50Hz; when the number of running water pumps is equal to 3 and the running frequency reaches 50Hz, the adjustment of the running frequency and the number of running water pumps 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 operating frequency and number of the water pumps in the first bypass are adjusted as follows:

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

[0044] The beneficial effects of the present invention are that, compared with the prior art, at least the present invention proposes a control method for utilizing the water in the long-distance, large-diameter hot and cold water transmission pipelines commonly found in all-electric energy stations to store and release energy to achieve friendly interaction with the power grid. The method fully utilizes the large-capacity characteristics of the water in the transmission pipelines, fully explores and utilizes the flexible control potential of the all-electric energy station, and provides a basis for the all-electric energy station to participate in the interaction with the power grid in an organized manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The present invention proposes an interactive control system between an all-electric energy station and a power grid based on pipeline energy storage. Figure 1 The reference numerals in the figures are described 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 one-way valve, 14-second one-way valve, 15-third one-way valve;

[0050] 16-first electric regulating valve, 29-second electric regulating valve;

[0051] 17-first heat exchange station plate exchange, 17a-first heat exchange station plate exchange first input end, 17b-first heat exchange station plate exchange first output end, 17c-first heat exchange station plate exchange second input end, 17d-first heat exchange station plate exchange second output end;

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

[0053] 23-the third heat exchange station plate exchange, 23a-the first input end of the third heat exchange station plate exchange, 23b-the first output end of the third heat exchange station plate exchange, 23c-the second input end of the third heat exchange station plate exchange, 23d-the second output end of the third heat exchange station plate exchange;

[0054] 26-nth heat exchange station plate exchanger, 26a-nth heat exchange station plate exchanger first input end, 26b-nth heat exchange station plate exchanger first output end, 26c-nth ​​heat exchange station plate exchanger second input end, 26d-nth heat exchange station plate exchanger second output end;

[0055] 18-water pump of the first heat exchange station, 21-water pump of the second heat exchange station, 24-water pump of the third heat exchange station, 27-water pump of the nth heat exchange station;

[0056] 31 - a first temperature sensor, 32 - a second temperature sensor, 33 - a third temperature sensor, 34 - a fourth temperature sensor, 35 - a fifth temperature sensor, 36 - a sixth temperature sensor;

[0057] 37-pressure sensor; 38-flow rate sensor. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work 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 that the all-electric energy station interacts with the power grid to carry out valley filling, green electricity consumption, etc., which is called the all-electric energy station operation energy storage mode; the second mode is that the all-electric energy station interacts with the power grid to carry out peak shaving, etc., which is called the all-electric energy station operation energy release mode.

[0060] The present invention proposes an interactive control system between an all-electric energy station and a power grid based on pipeline energy storage, such as Figure 1 As shown, the all-electric energy station includes multiple chillers, which are connected in parallel and then connected to the water inlet pipe and the water return pipe respectively, 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: a first chiller 1, a second chiller 2, and a third chiller 3, and the three chillers are connected in parallel; wherein 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 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 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 return pipe through the sixth electric valve 9;

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

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

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

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

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

[0067] When the all-electric energy station does not interact with the power grid, the second electric regulating valve is closed; when the all-electric energy station interacts with the power grid, the second electric regulating valve is opened; the control system proposed in the present invention closes the second electric regulating valve when the all-electric energy station does not interact with the power grid, 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 exchange station plate 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 flow rate measured by the flow rate sensor is greater than the preset flow rate target value, the second electric regulating valve is closed; when the flow rate measured by the flow rate sensor is less than the preset flow rate target value, the second electric regulating valve is opened;

[0069] The preset flow rate target values ​​include: a preset cold storage flow rate target value and a preset cold release flow rate target value; in the embodiment, the preset cold storage flow rate target value has a value range of 1 to 2 m / s, and the preset cold release flow rate target value has a value range of 1 to 2 m / s.

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

[0071] In the embodiment, the range of the preset pressure target value is the pressure required to ensure that the water flow 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 and frequency of operation of the first water pump 10, the second water pump 11 and the third water pump 12 are based on the most unfavorable water supply pressure. When the all-electric energy station interacts with the power grid, when the water supply pressure measured by the pressure sensor is less than the preset pressure target value required to ensure the water flow of the farthest heat exchange station, the operating frequency and number of the water pumps in the first bypass are adjusted according to the relationship between the water supply pressure measured by the pressure sensor and the preset pressure target value, including:

[0072] When the number of running water pumps is less than 3 and the running frequency is less than 50Hz, 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 pump is increased to 50Hz;

[0073] When the number of running water pumps is less than 3 and the running frequency reaches 50Hz, if the water supply pressure measured by the pressure sensor is less than the preset pressure target value, an additional water pump will be added to run, and the running frequency of the newly added water pumps will be increased to 50Hz;

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

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

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

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

[0078] When the number of running water pumps is greater than 0 and the operating frequency reaches 30Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, one water pump will be reduced;

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

[0080] In the embodiment, a control scheme is adopted to reduce the operating frequency and number of water pumps. The specific scheme is that when the operating frequency of the currently working water pump is reduced to 30Hz and is still greater than the preset pressure target value required to ensure the water flow of the farthest heat exchange station, one more water pump is reduced in operation, and the operating frequencies of all running water pumps are adjusted to the same frequency at the same time, until the frequency of all running water pumps reaches 30Hz, and then one water pump is reduced in operation.

[0081] In the present invention, different flow rates can be achieved by controlling the second electric regulating valve to open or close, and different preset flow rate target values ​​can be taken according to the needs of cold storage and cold release; in the embodiment, when the all-electric energy station is in energy storage mode, the flow rate is detected by the flow rate sensor to adjust the second electric regulating valve to ensure that the circulating water flow rate is not less than the preset flow rate target value (the flow rate target setting value range is 1 to 2 m / s), so that the circulating water has a higher flow rate, and energy is stored when each heat exchange station in the all-electric energy station is in the open state, or in the closed state, or the load is increased or reduced, which can ensure that the amount of water participating in the circulation in the system pipeline is maximized, thereby making full use of the total amount of circulating water in the pipeline network and ensuring the energy storage power. When the all-electric energy station is operating in the energy release mode, the flow rate is detected by the flow rate sensor to adjust the second electric regulating valve to ensure that the circulating water flow rate is not greater than the preset flow rate target value (the flow rate range is 0.1-0.2m / s), so that the circulating water has a lower flow rate. Energy is released when each heat exchange station in the all-electric energy station is in the open state, or in the closed state, or the load increases or decreases, to ensure that all circulating water in the system pipeline can circulate, and the cold energy stored in the circulating water can be used and released, while minimizing the direct mixing of the circulating water in the energy station supply pipe and the circulating water in the return pipe.

[0082] A first temperature sensor is provided on the chiller side of the water inlet pipe to measure 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 an energy storage mode or an 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 reduced and / or the load of the operating chillers is reduced;

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

[0085] A second temperature sensor is provided on the chiller side of the return pipe to detect 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 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 regulating 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 outlet water temperature target value, the first electric regulating valve is opened until it is fully opened; when the all-electric energy station interacts with the power grid and the all-electric energy station is in the energy release mode, the first electric regulating valve is closed;

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

[0088] The present invention also proposes a method for interactively controlling an all-electric energy station and a power grid based on pipeline network energy storage, comprising:

[0089] Step 1: When the all-electric energy station does not interact with the power grid, the second electric regulating valve is closed; when the all-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;

[0090] Step 2: When the all-electric energy station interacts with the power grid, the cooling load of the all-electric energy station and the total cooling power of the power grid are obtained;

[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 and 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 are 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 are 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 regulating 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 outlet water temperature target value, the first electric regulating valve is opened until it is fully 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 step 5 is entered;

[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 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, the number of operating chillers and / or the load of the operating chillers are 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 are reduced; the first electric regulating valve is closed; and the process goes to step 5;

[0093] Step 5, when the all-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;

[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 regulating 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 regulating 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 water 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 running water pumps is less than 3 and the running frequency is less than 50Hz, 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 pump is increased to 50Hz; when the number of running water pumps is less than 3 and the running frequency reaches 50Hz, 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 water pump is increased to 50Hz; when the number of running water pumps is equal to 3 and the running frequency reaches 50Hz, the adjustment of the running frequency and the number of running water 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 running water pumps is greater than 0 and the operating frequencies are greater than 30Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, the operating frequencies of the running water pumps are reduced to 30Hz; when the number of running water pumps is greater than 0 and the operating frequencies reach 30Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, one water pump is reduced from operation; when the number of running water pumps is equal to 0, the adjustment of the operating frequency and the number of running water pumps in the first bypass is stopped.

[0101] In the embodiment, the total cooling power 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 perform capacity expansion operation while bearing the normal cooling load of the all-electric energy station, using the large-capacity circulating water in the all-electric energy station network as a medium to reduce the circulating water temperature in the power grid circulation network, consuming more electricity to achieve cold storage. The specific process of this mode is:

[0102] After the circulating water of the energy station comes back from the external pipe network, it is divided into three routes and enters the first water pump 10, the second water pump 11 and the third water pump 12 respectively (the number and frequency of starting the water pumps are adjusted according to actual needs), and then the circulating water passes through the first one-way valve 13, the second one-way valve 14 and the third one-way valve 15 respectively and is collected. After being collected, the circulating water is divided into three routes again and passes through the first electric valve 4, the third electric valve 6 and the fifth electric valve 8 respectively to enter the first chiller 1, the second chiller 2 and the third chiller 3. The circulating water of each route flows out from the first chiller 1, the second chiller 2 and the third chiller 3 respectively. After being collected by the second electric valve 5, the fourth electric valve 7 and the sixth electric valve 9, when the first electric regulating valve 16 is opened, the collected circulating water is divided into two paths, one path passes through the first electric regulating valve 16 and enters the input end of the third water pump 12, and the other path flows out from the energy station and enters each heat exchange station and the second electric regulating valve 29 respectively. In the first heat exchange station, the circulating water enters the first heat exchange station water pump 18 for pressurization and then flows out into the first input end 17a of the first heat exchange station plate exchanger. The circulating water exchanges heat with the chilled water in the building corresponding to the first heat exchange station plate exchanger 17 in the first heat exchange station plate exchanger 17, and the cold energy is released to the chilled water in the building corresponding to the first heat exchange station plate exchanger 17. After the water is discharged, the circulating water itself is heated up and 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 for pressurization and then flows out into the first input end 20a of the second heat exchange station plate exchanger. In the second heat exchange station plate exchanger 20, the circulating water exchanges heat with the chilled water in the building corresponding to the second heat exchange station plate exchanger 20. After the cooling capacity is released to the chilled water, the circulating water itself is heated up and 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 for pressurization and then flows out into the first input end 23a of the third heat exchange station plate exchanger. The circulating water is discharged into the third heat exchange station plate exchanger 23 In the nth heat exchange station, the circulating water exchanges heat with the chilled water in the building corresponding to the third heat exchange station plate exchanger 23, and after releasing the cold to the chilled water, the circulating water itself rises in temperature and 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 for pressurization and flows out into the first input end 26a of the nth heat exchange station plate exchanger, and the circulating water exchanges heat with the chilled water in the building corresponding to the nth heat exchange station plate exchanger 26 in the nth heat exchange station plate exchanger 26, and after releasing the cold to the chilled water, the circulating water itself rises in temperature and flows out through the nth electric valve 28; after the circulating water enters the second electric regulating valve 29, it flows out after being depressurized. 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 regulating valve 29 are collected and returned to the energy station.

[0103] In the energy storage mode of the all-electric energy station, 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 addition and reduction control of the units are based on 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 return water temperature target setting value (the target setting 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 setting value, the chiller itself reduces the load 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 regulating valve 16 uses the outlet water temperature of the energy station detected by the second temperature sensor 32 as the control target. When it is higher than the outlet water target setting value (the outlet water target setting value range is 4-6°C), the first electric regulating valve 16 is closed until it is completely closed. When it is lower than the outlet water target setting value, the first electric regulating valve 16 is opened until it is completely opened. The first pressure sensor 37 detects the most unfavorable water supply pressure at the farthest end of the energy station. The number of first water pumps 10, second water pumps 11 and third water pumps 12 to be turned on and the operating frequency 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 setting value, the number of first water pumps 10, second water pumps 11 and third water pumps 12 to be turned on and the operating frequency are increased. When the pressure measured by the first pressure sensor 37 is higher than the pressure target setting value, the number of first water pumps 10, second water pumps 11 and third water pumps 12 to be turned on and the operating frequency are reduced. The second electric regulating valve 29 targets 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 setting value (the flow rate target setting value range is 1 to 2 m / s), the second electric regulating valve 29 is closed. When the circulating water flow rate is lower than the target setting value, the second electric regulating valve 29 is opened.

[0104] When the all-electric energy station is in energy release mode: the first chiller 1, the second chiller 2 and the third chiller 3 are operated at reduced capacity (reducing the total cooling power of the system to achieve peak power consumption of the energy station), and the large-capacity circulating water in the all-electric energy station network is used as the medium to increase the temperature of the circulating water in the system circulation network, release the cold stored in the circulating water, and achieve energy release. The specific process includes:

[0105] After the circulating water of the energy station comes back from the external pipe network, it is divided into three routes and enters the first water pump 10, the second water pump 11 and the third water pump 12 respectively (the number and frequency of the water pumps to be turned on are determined according to actual needs). Then, the circulating water passes through the first one-way valve 13, the second one-way valve 14 and the third one-way valve 15 respectively and is collected. After being collected, the circulating water is divided into three routes again and passes through the first electric valve 4, the third electric valve 6 and the fifth electric valve 8 respectively to enter the first chiller 1, the second chiller 2 and the third chiller 3 (the number of chillers to be turned on is determined according to the need for peak shaving). The circulating water of each route is respectively from the first chiller 10, the second water pump 11 and the third water pump 12 (the number and frequency of the water pumps to be turned on are determined according to actual needs). The water flows out of the water chiller 1, the second water chiller 2 and the third water chiller 3 respectively through the second electric valve 5, the fourth electric valve 7 and the sixth electric valve 9. At this time, the first electric regulating valve 16 is closed, and the circulating water flows out from the energy station and enters each heat exchange station and the second electric regulating valve 29 respectively. In the first heat exchange station, the circulating water enters the first heat exchange station water pump 18 for pressurization and then flows out into the first input end 17a of the first heat exchange station plate exchanger. The circulating water exchanges heat with the chilled water in the building corresponding to the first heat exchange station plate exchanger 17 in the first heat exchange station plate exchanger 17. After the cold capacity is released to the chilled water, the circulating water temperature itself is After the temperature is increased, 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 for pressurization and then flows out into the first input end 20a of the second heat exchange station plate exchanger. In the second heat exchange station plate exchanger 20, the circulating water exchanges heat with the chilled water in the building corresponding to the second heat exchange station plate exchanger 20. After the cold is released to the chilled water, the circulating water itself is heated up and 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 for pressurization and then flows out into the first input end 23a of the third heat exchange station plate exchanger. In the third heat exchange station plate exchanger 23, the circulating water exchanges heat with the third heat exchange station plate exchanger 24. The heat exchanger 23 of the heat exchange station exchanges heat with the chilled water in the building corresponding to the heat exchanger 23, and after releasing the cold to the chilled water, the circulating water itself increases in temperature and 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 for pressurization and flows out into the first input end 26a of the nth heat exchange station plate exchanger, and the circulating water exchanges heat with the chilled water in the building corresponding to the nth heat exchange station plate exchanger 26 in the nth heat exchange station plate exchanger 26, and after releasing the cold to the chilled water, the circulating water itself increases in temperature and flows out through the nth electric valve 28; after the circulating water enters the second electric regulating valve 29, it flows out after being depressurized. 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 regulating valve 29 are collected and returned to the energy station.

[0106] In the energy release mode of the all-electric energy station, the first temperature sensor 31 detects the return water temperature of the energy station, and sets the return water target temperature in the energy release mode (the temperature range of the return water target 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 based on 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 setting value of the energy release mode (indicating that the energy release is over 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 setting value, the chiller itself reduces the load 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 first water pumps 10, second water pumps 11 and third water pumps 12 to be turned on and the operating frequency 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 setting value, the number of first water pumps 10, second water pumps 11 and third water pumps 12 to be turned on and the operating frequency are increased. When the pressure is higher than the target setting value, the number of first water pumps 10, second water pumps 11 and third water pumps 12 to be turned on and the operating frequency are reduced. The second electric regulating valve 29 targets the circulating water flow rate detected by the first speed sensor 38. When the circulating water flow rate is higher than the target setting value of the energy release flow rate (the flow rate range is 0.1 to 0.2 m / s), the second electric regulating valve 29 is closed. When the circulating water flow rate is lower than the target setting value, the second electric regulating valve 29 is opened.

[0107] When the all-electric energy station is not in the energy storage mode and energy release mode, the second electric regulating valve 29 is closed, and the circulating water does not bypass through the second electric regulating valve 29. When the energy storage mode is in operation, the second electric regulating valve 29 is opened to ensure that the circulating water detected by the first flow rate sensor 38 has a higher flow rate (ensuring that the system has sufficient energy storage circulating water at any time), thereby ensuring that the amount of circulating water involved in energy storage is the maximum regardless of whether the heat exchange stations of the energy station are turned on or the load size is used for energy storage, thereby fully utilizing the total amount of circulating water in the pipe network and ensuring the energy storage power. When the energy release mode is in operation, the second electric regulating valve 29 is opened to ensure that the circulating water detected by the first flow rate sensor 38 has a lower flow rate, thereby ensuring that all circulating water in the pipe network can circulate regardless of whether the heat exchange stations of the energy station are turned on or the load size is used for energy release, and the cold stored in the circulating water can be utilized and released, while minimizing the direct mixing of circulating water in the water supply pipe of the energy station and circulating water in the return pipe.

[0108] The outlet water temperature on the secondary side of the heat exchanger plate in each heat exchange station is detected by the corresponding temperature sensor and regulated by changing the frequency of the water pump of the corresponding heat exchange station, thereby ensuring the stability of the outlet water temperature on the secondary side of the heat exchanger plate and meeting the cooling demand of the building corresponding to the heat exchange station.

[0109] In the embodiment, the flow rate of chilled water in the first chiller 1, the second chiller 2 and the third chiller 3 can be changed in a wide range, the range of the flow rate is [30%, 100%], and the temperature difference between the inlet and outlet of the chilled water can be changed in a wide range, the range of change is [1, 8] ° C. The smaller the inlet and outlet temperature difference of the chiller allowed, the greater the cold capacity that can be stored in the circulating water in the energy station pipe 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 control system and method proposed in the present invention, on the basis of establishing a dynamic simulation model of the transmission and distribution pipeline network, predicts the load of building users, calculates the energy storage peak-shaving capacity of the pipeline network, and based on the operation strategy optimization model of the all-electric energy station, finally forms a friendly interactive control strategy method between the all-electric energy station and the power grid according to the grid interaction incentive policy and takes maximizing the revenue of the energy station as the goal. Without affecting the comfort of users, it meets the interactive needs of the power grid such as peak-shaving and emergency response, improves the flexible adjustment capability of the local power grid while improving the revenue of the all-electric energy station, ensures the safety of the power grid, and at the same time, ensures the safety of the power grid operation and increases the proportion of green electricity in the power grid while maximizing the revenue of the energy station.

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

[0113] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A 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 of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0114] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, 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 can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The 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 the computer-readable storage medium in each computing / processing device.

[0115] The computer program instructions for performing the operation 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 "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via 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., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing 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 rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An all-electric energy station and power grid interactive control system based on pipeline energy storage, the all-electric energy station includes multiple chillers, the multiple chillers are connected in parallel and 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, and each heat exchange station includes a set of heat exchange station plate exchange; characterized in that, include: A first bypass and a second bypass; The first bypass is arranged in the all-electric energy station, and the first bypass includes: a first water pump, a second water pump, a third water pump, a first one-way valve, a second one-way valve, a third one-way valve, and a first electric regulating valve; the output ends of all chillers are connected to one end of the first electric regulating valve through a return pipe, and the other end of the first electric regulating 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 one-way valve, the other end of the second water pump is connected to one end of the second one-way valve, the other end of the third water pump is connected to one end of the third one-way valve, and the other end of the first one-way valve, the other end of the second one-way valve, and the other end of the third one-way valve are connected to the input ends of all chillers through a water inlet 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 regulating valve, and a flow rate sensor; one end of the second electric regulating valve is connected to the return pipe, and the other end of the second electric regulating valve is connected to the water inlet pipe, a pressure sensor is arranged at the connection between one end of the second electric regulating valve and the return pipe, and a flow rate sensor is arranged at the connection between the other end of the second electric regulating valve and the water inlet pipe; When the all-electric energy station does not interact with the power grid, the second electric regulating valve is closed; when the all-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 all-electric energy station interacts with the power grid, the operating frequency and number of water pumps in the first bypass are adjusted according to the relationship between the water supply pressure measured by the pressure sensor and the preset pressure target value.

2. The all-electric energy station and power grid interactive control system based on pipeline network energy storage according to claim 1 is characterized in that: 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 regulating 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 regulating valve is increased.

3. The interactive control system of all-electric energy station and power grid based on pipeline network energy storage according to claim 2 is characterized in that: The preset flow rate target values ​​include: a preset cold storage flow rate target value and a preset cold release flow rate target value; in the embodiment, the preset cold storage flow rate target value has a value range of 1 to 2 m / s, and the preset cold release flow rate target value has a value range of 1 to 2 m / s.

4. The interactive control system of all-electric energy station and power grid based on pipeline network energy storage according to claim 2 is characterized in that: 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: When the number of running water pumps is less than 3 and the running frequency is less than 50Hz, 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 pump is increased to 50Hz; When the number of running water pumps is less than 3 and the running frequency reaches 50Hz, if the water supply pressure measured by the pressure sensor is less than the preset pressure target value, an additional water pump is added to run, and the running frequency of the newly added water pump is increased to 50Hz; When the number of running water pumps is equal to 3 and the operating frequencies all reach 50 Hz, the adjustment of the operating frequency and the number of running water pumps in the first bypass is stopped.

5. The interactive control system of all-electric energy station and power grid based on pipeline network energy storage according to claim 2 is 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 pumps in the first bypass includes: When the number of running water pumps is greater than 0 and the operating frequencies are all greater than 30Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, the operating frequencies of the running water pumps are all reduced to 30Hz; When the number of running water pumps is greater than 0 and the operating frequency reaches 30Hz, if the water supply pressure measured by the pressure sensor is greater than the preset pressure target value, one water pump will be reduced; When the number of running water pumps is equal to 0, the adjustment of the operating frequency and the number of running water pumps in the first bypass is stopped.

6. The interactive control system of all-electric energy station and power grid based on pipeline network energy storage according to claim 1 is characterized in that: A first temperature sensor is provided on the chiller side of the water inlet pipe to measure 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 an energy storage mode or an 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 reduced and / or the load of the operating chillers is reduced; The return water temperature target value range is [5,7]℃.

7. The interactive control system of all-electric energy station and power grid based on pipeline network energy storage according to claim 1 is characterized in that: A second temperature sensor is provided on the chiller side of the return pipe to detect 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 and 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 regulating 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 outlet water temperature target value, the first electric regulating valve is opened until it is fully 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 regulating valve is closed; The target value of the outlet water temperature ranges from [4,6]℃.

8. A method for interactive control of an all-electric energy station and a power grid based on pipeline network energy storage, characterized in that: include: Step 1, when the all-electric energy station does not interact with the power grid, the second electric regulating valve is closed; When the all-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; Step 2: When the all-electric energy station interacts with the power grid, the cooling load of the all-electric energy station and the total cooling power of the power grid are obtained; 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 and 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 are 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 are 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 regulating 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 outlet water temperature target value, the first electric regulating valve is opened until it is fully 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 go to 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 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, the number of operating chillers and / or the load of the operating chillers are 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 are reduced; the first electric regulating valve is closed; And go to step 5; Step 5, when the all-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; 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 water pumps in the first bypass are adjusted.

9. The interactive control method between an all-electric energy station and a power grid based on pipeline network energy storage according to claim 8 is characterized in that: 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 regulating 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 regulating valve is increased; The preset flow rate target values ​​include: a preset cold storage flow rate target value and a preset cold release flow rate target value; in the embodiment, the preset cold storage flow rate target value has a value range of 1 to 2 m / s, and the preset cold release flow rate target value has a value range of 1 to 2 m / s.

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

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