An automatic control method for an energy station based on topological relations

Abstract

The application discloses an automatic control method of an energy station based on a topological relation and relates to the technical field of automatic control of energy stations, solves the technical problem that the control flow of an existing automatic control system is linear and single and lacks global awareness, and the technical solution is that the number of energy station equipment in operation is monitored by using the topological relation of the energy station, the state that the actual number of equipment in operation deviates from the preset number due to faults or other reasons in the operation process of the energy station can be identified relatively quickly and accurately, and when the number of equipment deviates, the equipment required for operation for correction of the deviation is automatically planned and corrected by the topological relation, the deviation is automatically corrected, and the defect that the control ability is lost when the energy station equipment is faulty or in an unexpected situation due to incomplete flow coverage or incomplete algorithm in traditional PLC or DDC control is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic control of energy stations, and particularly relates to an automatic control method of energy stations based on topological relations. BACKGROUND

[0002] Energy stations are one of the most important energy consumption systems in public buildings, and there are also great differences between individuals. Under the condition of meeting the use demand of buildings, different control operation modes of energy station equipment will bring great energy consumption difference. There is great energy-saving potential through optimizing the control operation of refrigeration systems. The automatic control system is an important part of the regulation and control of energy stations, and whether it has good control ability is an important factor to ensure the stable operation of energy stations. At present, the automatic control system of energy stations is mainly composed of upper computers, PLCs / DDCs, electric valve actuators, various sensing devices and energy station equipment control cabinets. Its architecture is to wire all digital or analog signal points in the field, connect them to several PLC / DDC devices, and then connect the PLC / DDC to the upper computer. PLC / DDC is widely used in industrial control field, and it stores a series of related algorithms for operation and regulation in the field through ladder diagram. One of the reasons for the high discard rate of the automatic control system is that the existing automatic control system control process is linear and single, has no global awareness, and cannot accurately respond to the state changes in the control process. SUMMARY

[0003] The present application provides an automatic control method of energy stations based on topological relations, and the technical purpose is to identify the state that the actual running number deviates from the preset number due to equipment failure or other reasons during the operation of the energy station, and automatically correct the deviation to realize the safe and stable operation of the energy station.

[0004] The above technical purpose of the present application is realized through the following technical scheme:

[0005] An automatic control method of energy stations based on topological relations, comprising:

[0006] S1: establishing the topological relation of the energy station through the principle diagram of the energy station, and constructing an adjacency matrix through the topological relation of the energy station; wherein the principle diagram of the energy station includes the connection relation of the energy station equipment;

[0007] S2: collecting rated parameters and running parameters of the energy station equipment, and pre-processing the running parameters in real time to obtain equipment start-stop state information and equipment control state information; wherein the rated parameters include rated refrigerating capacity of the water chiller, rated power of the water chiller, rated flow of the water chiller, rated heat exchange capacity of the plate heat exchanger, rated power of the water pump, rated flow of the water pump, rated refrigerating capacity of the heat pump unit, rated heating capacity of the heat pump unit, rated power of the heat pump unit, and rated flow of the heat pump unit; and the running parameters include chilled water supply and return water temperature of the water chiller, cooling water supply and return water temperature of the water chiller, start-stop state of the water chiller, control state of the water chiller, start-stop state of the water pump, control state of the water pump, start-stop state of the electric valve, control state of the electric valve, evaporating side supply and return water temperature of the heat pump unit, condensing side supply and return water temperature of the heat pump unit, start-stop state of the heat pump unit, and control state of the heat pump unit;

[0008] S3: establishing a real-time updated equipment state table for each node in the energy station topology relationship through the equipment start-stop state information and the equipment control state information, and updating the values in the adjacency matrix through the equipment state table;

[0009] S4: giving or calculating a recommended value of the number of running energy station equipment;

[0010] S5: judging whether there is a deviation between the number of currently started energy station equipment and the recommended value by using the adjacency matrix, and if there is a deviation, processing the deviation to complete the automatic control of the energy station.

[0011] The application has the advantages that the number of running energy station equipment is monitored by using the energy station topology relationship, the state that the actual number of running equipment deviates from the preset number due to faults or other reasons during the running of the energy station can be quickly and accurately identified, and when the number of equipment deviates, the equipment required for operation for correcting the deviation is automatically planned and corrected, avoiding the disadvantages that the traditional PLC or DDC control loses the control ability when the energy station equipment fails or unexpected situations occur due to incomplete process coverage or incomplete algorithm. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 Flowchart of an embodiment of the energy station automatic control method based on the topology relationship described in the application;

[0013] Figure 2 Flowchart of the establishment of the energy station topology relationship of an embodiment of the application;

[0014] Figure 3 Schematic diagram of the energy station topology relationship of an embodiment of the application;

[0015] Figure 4 This is a schematic diagram of the process for preprocessing operating parameters according to an embodiment of this application;

[0016] Figure 5 This is a schematic diagram of an adjacency matrix in one embodiment of this application;

[0017] Figure 6 This is a flowchart illustrating how an embodiment of this application uses an adjacency matrix to determine whether the number of currently activated devices at an energy station deviates from the recommended value, and how the devices are operated to handle any potential deviations.

[0018] In the diagram: X1 - Cooling water return control node; X2 - Cooling water supply control node; X3 - Chilled water return control node; X4 - Chilled water supply control node; A1, A2, A3, A4 represent four different cooling water pumps; B1, B2, B3, E1, E2, E3 represent six different electric valves; C1, C2, C3 represent three different chiller units; D1 - Water collector; F1, F2, F3, F4 represent four different chilled water pumps; G1 - Water distributor. Detailed Implementation

[0019] The technical solution of this application will be described in detail below with reference to the accompanying drawings.

[0020] Combination Figure 1 The energy station automatic control method based on topology described in this application includes:

[0021] S1: Establish the topological relationship of the energy station through the energy station schematic diagram, and construct the adjacency matrix through the topological relationship of the energy station; wherein, the energy station schematic diagram includes the connection relationship of the energy station equipment.

[0022] S2: Collect the rated parameters and operating parameters of the energy station equipment, and preprocess the operating parameters in real time to obtain equipment start-up / stop status information and equipment control status information; wherein, the rated parameters include the rated cooling capacity, rated power, rated flow rate of the chiller unit, rated heat exchange capacity of the plate heat exchanger, rated power, rated flow rate of the water pump, rated cooling capacity, rated heat exchange capacity, rated heat exchange capacity, rated power, and rated flow rate of the heat pump unit; the operating parameters include the chilled water supply and return temperatures of the chiller unit, the cooling water supply and return temperatures of the chiller unit, the start-up / stop status of the chiller unit, the control status of the chiller unit, the start-up / stop status of the water pump, the control status of the water pump, the start-up / stop status of the electric valve, the control status of the electric valve, the evaporator side supply and return temperatures of the heat pump unit, the condenser side supply and return temperatures of the heat pump unit, the start-up / stop status of the heat pump unit, and the control status of the heat pump unit.

[0023] S3: Establishing a real-time updated device state table for each node in the energy station topology relationship through the device start-stop state information and the device control state information, and updating the values in the adjacency matrix through the device state table.

[0024] S4: Giving or calculating the recommended value of the number of energy station devices in operation.

[0025] S5: Using the adjacency matrix to determine whether there is a deviation between the recommended value and the number of currently opened energy station devices, and if there is, processing the deviation to complete the automatic control of the energy station.

[0026] As shown in Figure 2 , in step S1, the energy station topology relationship is established through the energy station schematic diagram, including:

[0027] S111: Acquiring the device nodes and the control nodes in the energy station schematic diagram; wherein the device nodes include operable device nodes and non-operable device nodes, the operable device nodes include electric valves, chilled water pumps, water chillers, cooling water pumps and heat pump units, and the non-operable device nodes include water distributors, water collectors, cold storage tanks and plate heat exchangers; the control nodes include chilled water supply control nodes, chilled water return control nodes, cooling water supply control nodes and cooling water return control nodes;

[0028] Specifically, the water distributors, water collectors, electric valves, cold storage tanks, chilled water pumps, water chillers, plate heat exchangers, cooling water pumps and heat pump units in the energy station schematic diagram are abstracted as device nodes in the topology relationship; the chilled water supply main pipe is abstracted as a chilled water supply control node, the chilled water return main pipe is abstracted as a chilled water return control node, the cooling water supply main pipe is abstracted as a cooling water supply control node, and the cooling water return main pipe is abstracted as a cooling water return control node.

[0029] S112: Using the pipe connection relationship and the water flow direction in the energy station schematic diagram to connect the device nodes and the control nodes in a directed manner.

[0030] S113: Connecting the cooling water supply control node to the chilled water return control node in a directed manner to generate the energy station topology relationship.

[0031] The energy station topology relationship generated by the embodiment is shown in Figure 3 .

[0032] The Figure 3 energy station topology relationship is used to generate an adjacency matrix as shown in Figure 5 , and the generation method of the adjacency matrix includes:

[0033] S121: Represent the energy station topology as G = (V, E); where V represents the node set consisting of all equipment nodes and control nodes, and E represents the edge set recording the connections between nodes. Each node V i V corresponds to a device node or control node. i ∈V, if node V i With node V j There is a connection relationship V i →V j Then it is denoted as E. ij E ij ∈E;

[0034] S122: Initialize the adjacency matrix as an N*N matrix A, then the value of the element in the i-th row and j-th column of the adjacency matrix A is A. ij Defined as:

[0035] like Figure 4 As shown, in step S2, the operating parameters are preprocessed in real time, including: S21: converting the non-numerical operating parameters of the air conditioning equipment into numerical values, for example, the equipment's on / off status, where 1 represents on and 0 represents off; S22: setting the threshold range for the operating parameters, and removing and correcting outliers based on the threshold range, for example, the equipment frequency exceeding the power frequency or falling below the minimum limit frequency; S23: filling in missing values ​​using interpolation or extrapolation.

[0036] In a specific embodiment, in step S3, the device status table records the start / stop status value and control status value of each node in the topology. The real-time update of the device status table includes: For operable device nodes: when the device is running, the start / stop status value is updated to 1; when the device stops, the start / stop status value is updated to 0; when the device is in a normal state, the control status value is updated to 1; when the device is in a fault state or the device operation fails after a control command is issued, the control status value is updated to 0; and when the control status value is updated to 0 due to the device operation failure after a control command is issued, it will not be updated again before the end of all processes; for non-operable device nodes: the start / stop status value and the control status value are always 1.

[0037] In a specific embodiment, step S3 involves updating the values ​​in the adjacency matrix using the device status table, including:

[0038] S31: If device node V i If the control status value in the device status table is 0, then E ij Remove from edge set E to form a new edge set E new The new energy station topology is obtained as G = (V, E) new ); where 1≤j≤N;

[0039] S32: update the element values in the adjacency matrix A by using G=(V, E new ) to obtain A', at this time the element values A' ij in the adjacency matrix A' are defined as:

[0040] As a specific embodiment, the recommended value described in the embodiment can be given manually or calculated by a computer using energy station equipment operation data.

[0041] As Figure 6 shown, step S5 includes:

[0042] S51: search and establish a set of all paths between the chilled water return control nodes and the chilled water supply control nodes in the energy station topology relationship by using the adjacency matrix, delete the paths that do not pass through all the control nodes, and delete the paths that contain two or more than two water chillers and / or plate heat exchangers and / or heat pump units, to obtain the remaining path set; identify the paths in which all the device nodes on the paths have a start-stop state value of 1 by using the device state table, define the set formed by these paths as the valid path set, and define the set formed by other paths outside the valid path set as the unused path set, calculate the number of opened devices in the valid path set, and determine whether there is a deviation between the number of opened devices and the recommended value, if there is a deviation, go to step S52, otherwise go to step S59;

[0043] S52: determine whether the latest unused path set is empty, if not empty, go to step S53, otherwise go to step S511;

[0044] S53: score the paths in the latest unused path set, and select the path with the highest score as the control candidate path;

[0045] S54: sort the devices included in the control candidate path according to the control priority order, and operate the device with the highest priority;

[0046] S55: if the operation is successful, update the control state value of the device to 1 in the device state table, if the operation fails, update the control state value of the device to 0 in the device state table, to obtain the latest device state table;

[0047] S56: update the values in the adjacency matrix by using the latest device state table to obtain a new adjacency matrix;

[0048] S57: Search and establish a set of all paths between the chilled water return control nodes and the chilled water supply control nodes in the energy station topology relationship through the new adjacency matrix, delete the paths not passing through all the control nodes, and delete the paths containing two or more than two water chillers and / or plate heat exchangers and / or heat pump units, form a new residual path set; identify the paths in which all the device nodes on the paths in the residual path set have a start-stop state value of 1 through the device state table, define the set formed by these paths as a new effective path set, and define other paths outside the new effective path set as a new non-enabled path set, calculate the number of opened devices in the new effective path set, and determine whether the number of opened devices deviates from the recommended value, if there is a deviation, go to step S58, otherwise go to step S59;

[0049] S58: Determine whether the control alternative path selected in step S53 is in the non-enabled path set defined in step S57, if yes, return to step S54, otherwise return to S53;

[0050] S59: Determine whether there is an operable device not on the latest effective path and the device has a start-stop state value of 1 in the device state table, if yes, go to step S510, otherwise go to step S511;

[0051] S510: Remove all operable devices not on the latest effective path set and having a start-stop state value of 1 in the device state table, sort the removed devices according to the control priority order, operate the device with the highest priority, and if the operation is successful, return to step S59, otherwise go to step S511;

[0052] S511: Generate an operation report and end the process.

[0053] As a specific embodiment, step S53 includes:

[0054] S531: The initial score of all paths in the non-enabled path set is 0, score each node in the path through the start-stop state value of each node in the device state table, if the node has a start-stop state value of 1 in the device state table, the score of the path in which the node is located is increased by 1, thereby obtaining the scores of all paths in the non-enabled path set;

[0055] S532: Sort all paths in the non-enabled path set according to the score, select the path with the highest score as the control alternative path, and if there are multiple paths with the highest score, randomly select one as the control alternative path.

[0056] As a specific embodiment, the control priority order comprises: in the starting action, the control priority order from high to low is: electric valve, chilled water pump, cooling water pump, heat pump unit, water chiller; in the stopping action, the control priority order from high to low is: water chiller, heat pump unit, chilled water pump, cooling water pump, electric valve.

[0057] The above merely provides preferred embodiments of the present application but is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for automatic control of an energy station based on topological relations, characterized in that, The method comprises the following steps: S1: establishing an energy station topology relationship through an energy station schematic diagram, and constructing an adjacency matrix through the energy station topology relationship; wherein the energy station schematic diagram comprises an energy station device connection relationship; S2: collecting rated parameters and operating parameters of the energy station devices, and performing real-time preprocessing on the operating parameters to obtain device start-stop state information and device control state information; wherein the rated parameters comprise rated refrigerating capacity of a water chiller, rated power of the water chiller, rated flow of the water chiller, rated heat exchange capacity of a plate heat exchanger, rated power of a water pump, rated flow of the water pump, rated refrigerating capacity of a heat pump unit, rated heating capacity of the heat pump unit, rated power of the heat pump unit, and rated flow of the heat pump unit; and the operating parameters comprise chilled water supply and return water temperature of the water chiller, cooling water supply and return water temperature of the water chiller, start-stop state of the water chiller, control state of the water chiller, start-stop state of the water pump, control state of the water pump, start-stop state of an electric valve, control state of the electric valve, evaporating side supply and return water temperature of the heat pump unit, condensing side supply and return water temperature of the heat pump unit, start-stop state of the heat pump unit, and control state of the heat pump unit; S3: establishing a real-time updated device state table for each node in the energy station topology relationship through the device start-stop state information and the device control state information, and updating values in the adjacency matrix through the device state table; S4: giving or calculating a recommended value of the number of energy station device operating quantities; S5: judging whether there is a deviation between the number of current energy station start devices and the recommended value by using the adjacency matrix, and if there is a deviation, processing the deviation to complete automatic control of the energy station; wherein step S5 comprises: S51: searching and establishing a set for all paths between a cooling water return control node and a chilled water supply control node in the energy station topology relationship through the adjacency matrix, deleting paths not passing through all control nodes, and deleting paths containing two or more water chillers and / or plate heat exchangers and / or heat pump units, to obtain a remaining path set; identifying paths in which all device nodes on the paths have a start-stop state value of 1 through the device state table, defining a set formed by the paths as an effective path set, defining a set formed by other paths as a non-enabled path set, calculating the number of start devices in the effective path set, and judging whether there is a deviation between the number of start devices and the recommended value, if there is a deviation, turning to step S52, and if there is no deviation, turning to step S59; S52: judging whether the latest non-enabled path set is empty, if not empty, turning to step S53, and if empty, turning to step S511; S53: scoring paths in the latest non-enabled path set, and selecting a path with the highest score as a control candidate path; S54: sorting devices in the control candidate path that need to be operated according to a control priority order, and operating a device with the highest priority. S55: If the operation is successful, the control state value of the device is updated to 1 in the device state table, and if the operation fails, the control state value of the device is updated to 0 in the device state table, to obtain the latest device state table; S56: The values in the adjacency matrix are updated through the latest device state table to obtain a new adjacency matrix; S57: All paths between the chilled water return control node and the chilled water supply control node in the energy station topological relationship are searched and a set is established through the new adjacency matrix, paths that do not pass through all control nodes are deleted, and paths containing two or more water chillers and / or plate heat exchangers and / or heat pump units are deleted to form a new residual path set; all paths in the new residual path set are identified through the device state table, and the paths formed by the set are defined as a new effective path set, and other paths outside the new effective path set are defined as a new unenabled path set, the number of devices in the new effective path set is calculated, and whether the number of devices deviates from the recommended value is determined, if there is a deviation, step S58 is turned to, otherwise step S59 is turned to; S58: Whether the control alternative path selected in step S53 is in the unenabled path set defined in step S57 is determined, if yes, step S54 is returned, otherwise step S53 is returned; S59: Whether there is an operable device on a path not in the latest effective path set and the device has an on-off state value of 1 in the device state table is determined through the device state table, if yes, step S510 is turned to, otherwise step S511 is turned to; S510: All operable devices not on the latest effective path set and having an on-off state value of 1 in the device state table are de-duplicated, the de-duplicated devices are sorted according to the control priority order, the device with the highest priority is operated, and if the operation is successful, the process returns to step S59, otherwise step S511 is turned to; S511: An operation report is generated and the process is ended.

2. The method of claim 1, wherein, In step S1, the energy station topological relationship is established through the energy station schematic diagram, including: S111: The device nodes and control nodes in the energy station schematic diagram are obtained; wherein the device nodes include operable device nodes and inoperable device nodes, the operable device nodes include electric valves, chilled water pumps, water chillers, cooling water pumps and heat pump units, and the inoperable device nodes include water distributors, water collectors, cold storage tanks and plate heat exchangers; the control nodes include chilled water supply control nodes, chilled water return control nodes, cooling water supply control nodes and cooling water return control nodes; S112: The device nodes and control nodes are connected with direction through the pipe connection relationship and water flow direction in the energy station schematic diagram; S113: The cooling water supply control node is connected to the chilled water return control node.

3. The method of claim 2, wherein, In step S1, the adjacency matrix is constructed through the energy station topological relationship, including: S121: Represent the energy station topology as G = (V, E); where V represents the node set consisting of all equipment nodes and control nodes, and E represents the edge set recording the connections between nodes. Each node V i V corresponds to a device node or control node. i ∈V, if node V i With node V j There is a connection relationship V i →V j Then it is denoted as E. ij E ij ∈E; S122: initialize the adjacency matrix as an N*N matrix A, then the value of the element in the ith row and jth column of the adjacency matrix A is A ij is defined as:

4. The method of claim 1, wherein, In step S2, the running parameters are preprocessed in real time, including: S21: The non-numerical running parameters of the air conditioning device are converted into numerical values; S22: setting a threshold range of the operating parameter, and eliminating and correcting the abnormal value according to the threshold range; S23: filling the missing value by interpolation or extrapolation.

5. The method of claim 3, wherein, In step S3, the real-time updating of the device state table includes: For the operable device node: when the device is running, the start-stop state value is updated to 1; when the device is stopped, the start-stop state value is updated to 0; when the device is in normal state, the control state value is updated to 1; when the device is in fault state or when the device fails to operate after the control command is issued, the control state value is updated to 0; and when the control state value is updated to 0 due to the failure of the device operation after the control command is issued, the control state value will not be updated again before all processes are completed; For the inoperable device node: the start-stop state value and the control state value are always 1.

6. The method of claim 5, wherein, In step S3, the values in the adjacency matrix are updated by the device state table, including: S31: If the device node V i The control state value in the device state table is 0, and E ij is removed from the edge set E to form a new edge set E new , and a new energy station topology relationship G = (V, E new ) is obtained; wherein 1≤j≤N; S32: Update the element values in the adjacency matrix A by using G = (V, E new ) to obtain A', at this time the element values A' ij in the adjacency matrix A' are defined as:

7. The method of claim 6, wherein, Step S53 includes: S531: the initial score of all paths in the unactivated path set is 0, each node in the path is scored by the start-stop state value of each node in the device state table, if the start-stop state value of the node in the device state table is 1, the score of the path where the node is located is added by 1, thereby obtaining the scores of all paths in the unactivated path set; S532: sort all paths in the unactivated path set according to the score size, select the path with the highest score as the control candidate path, if there are multiple paths with the highest score, randomly select one as the control candidate path.

8. The method of claim 7, wherein, The control priority order includes: When starting the operation, the control priority order from high to low is: electric valve, chilled water pump, cooling water pump, heat pump unit, water chiller; When stopping the operation, the control priority order from high to low is: water chiller, heat pump unit, chilled water pump, cooling water pump, electric valve.

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