A power grid EMS control method and device

Abstract

The present invention discloses a power grid EMS control method and a control device, including: establishing a static CIM model of power grid equipment according to the actual electrical wiring diagram of the power grid; transplanting the static CIM model of the power grid into the controller of the power grid EMS system; collecting and analyzing the measurement data of each switching device in the power grid through the IO channel of the controller to determine the connection relationship between the devices in the CIM model, forming independent topological units; and collecting and analyzing the measurement data of other devices in the power grid, integrating each topological unit and filtering out the topological units without power supply to form independent topological islands. The present invention can detect the changes of the power grid in real time and adapt to the changes of the power grid to ensure the stability of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid control, and in particular to a power grid EMS control method and device. Background Art

[0002] As the scale of my country's offshore oil industry continues to expand, the topological structure of offshore oil platform power grids is becoming more and more complex. In order to better improve the power quality, safety and stability of offshore power grids, an offshore power grid EMS control method is needed, whose functions include monitoring and remote control of key equipment, generator set control, power grid active and reactive power flow and voltage control, power grid online stability control, power grid operation hot standby margin management and comprehensive control of key loads, etc. It can monitor the operation of the power grid in real time, handle faults in time, avoid power grid decoupling, reduce black starts, enhance the impact resistance of the power grid, and improve the automation control level of offshore power grids.

[0003] Due to the special nature of the production of offshore island power grids, the operation changes frequently. Therefore, the number of topological islands after topological analysis and the generators and loads contained are constantly changing dynamically. The power control of the power grid under different topological structures and the system stability control after the topological structure changes are directly related to the results of topological analysis. The existing power grid control methods cannot well control the frequently changing topological islands. Summary of the invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide a power grid EMS control method and device to solve the problems of low efficiency and poor adaptability of existing power grid control methods.

[0005] The present invention solves the above technical problems and in one aspect provides a power grid EMS control method, comprising:

[0006] Establish a static CIM model of the power grid equipment based on the actual electrical wiring diagram of the power grid;

[0007] Transplanting the static CIM model of the power grid into a controller of the power grid EMS system;

[0008] Collecting and analyzing the measurement data of each switch device in the power grid through the IO channel of the controller to determine the connection relationship between the devices in the CIM model to form an independent topology unit; and

[0009] Collect and analyze the measurement data of other devices in the power grid, integrate various topological units and filter out the topological units without power supply to form an independent topological island.

[0010] Another aspect of the present invention further provides a power grid EMS control device, comprising:

[0011] A static model configuration unit for configuring a static CIM model of grid equipment according to the actual electrical wiring diagram of the power grid;

[0012] A data acquisition unit for acquiring and parsing the measurement data of switch-type equipment and its various devices in the power grid;

[0013] A topology analysis unit for determining the connection relationship between devices in the CIM model based on the measurement data of various switch-type devices acquired and parsed by the data acquisition unit to form independent topology units; and integrating each topology unit and filtering out powerless topology units based on the measurement data of other devices in the power grid to form independent topology islands.

[0014] The power grid control method and device according to the embodiments of the present invention can, due to the ability to analyze the actual topology structure of the power grid in real time, adapt to complex ring networks and island power grids with variable operating states and high reliability requirements; realize the monitoring, automatic control, and dispatching management of different types of units; effectively monitor the power grid quality and quickly locate the fault source, solving problems such as few maintenance personnel for offshore power supply; and ensure the safe, reliable, high-quality, and economical operation of the offshore power grid. Considering the actual situation of the offshore power grid, it makes up for the defects of the existing method of determining the topology structure of the offshore power grid based on manual experience. Description of the Drawings

[0015] Figure 1 Schematic diagram of the implementation process of the power grid EMS control method provided by the embodiments of the present invention;

[0016] Figure 2 Example diagram of the power grid CIM model provided by one embodiment of the present invention;

[0017] Figure 3 Example diagram of the offshore power grid electrical model provided by one embodiment of the present invention;

[0018] Figure 4 Schematic diagram of the structure of the power grid EMS control device provided by one embodiment of the present invention. Detailed Embodiments

[0019] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] To solve the above technical problems, the present invention provides a power grid EMS control method in one aspect, including:

[0021] Establishing a static CIM model of grid equipment according to the actual electrical wiring diagram of the power grid;

[0022] Transfer the static CIM model of the power grid to the controller of the power grid EMS system;

[0023] Collect and analyze the measurement data of each switching device in the power grid through the IO channel of the controller to determine the connection relationship between devices in the CIM model, and form independent topological units; and

[0024] Collect and analyze the measurement data of other devices in the power grid, integrate each topological unit and filter out the topological units without power supply to form independent topological islands.

[0025] In one embodiment, when the detection data of the switching device is 1, it represents that the switching device is closed; when the detection data is 0, it represents that the switching device is open.

[0026] In one embodiment, the devices in the static CIM model at least include generators, loads, transformers, and switches; among them, the switches include circuit breakers and disconnectors.

[0027] In one embodiment, the steps of establishing the static CIM model include:

[0028] Establish device container classes according to the power grid levels to which the devices belong;

[0029] Establish device classes in the device container classes;

[0030] Add connection points between devices with connection relationships;

[0031] Add terminals between devices and connection points;

[0032] Establish the measurement attributes corresponding to the devices.

[0033] In one embodiment, it further includes the steps of: obtaining the actual operating conditions of the power grid based on the independent topological islands, calculating the power thermal reserve of the current operating conditions of the power grid; when there is a node open circuit or disconnection and reconnection in the power grid, the IO channel of the controller obtains and analyzes the measurement data of each switching device to determine the connection relationship between devices in the CIM model, re-determine the power grid topology structure, adjust the reactive power flow and calculate the thermal reserve, and in the case of insufficient thermal reserve, trip some nodes in the power grid; and adjust the active and reactive powers of the balance bus to make the active and reactive power distributions of the power grid within the required regions and reach a new steady-state operating state.

[0034] In one embodiment, the control method is applied to an offshore power grid.

[0035] Another aspect of the present invention further provides a power grid EMS control device, including:

[0036] A static model configuration unit for configuring a static CIM model of grid equipment according to the actual electrical wiring diagram of the power grid;

[0037] A data acquisition unit for acquiring and parsing the measurement data of switch equipment and its various devices in the power grid;

[0038] A topology analysis unit for determining the connection relationship between devices in the CIM model based on the measurement data of each switch device acquired and parsed by the data acquisition unit to form an independent topology unit; and integrating each topology unit according to the measurement data of other devices in the power grid and filtering out the topology units without power sources to form independent topology islands.

[0039] In one embodiment, it further includes: a hot standby management unit for calculating the power hot standby of the current working condition of the power grid;

[0040] A priority tripping unit for tripping some nodes in the power grid when there is a node open circuit or a disconnection and reconnection in the power grid and the hot standby is insufficient;

[0041] A power management unit for adjusting the active and reactive power of the balance bus when there is a node open circuit or a disconnection and reconnection in the power grid, so that the active and reactive power distribution of the power grid is within the required area and reaches a new steady-state operation state.

[0042] In one embodiment, the static model configuration unit is further set as:

[0043] Establishing device container classes according to the power grid levels to which the devices belong;

[0044] Establishing device classes in the device container classes;

[0045] Adding connection points between devices with a connection relationship;

[0046] Adding terminals between devices and connection points;

[0047] Establishing the measurement attributes corresponding to the devices;

[0048] Establishing a static CIM model of grid equipment according to the actual electrical wiring diagram of the power grid and configuring it into the controller.

[0049] In one embodiment, the power grid is an offshore power grid.

[0050] The following further details the specific implementation manners of the present invention in conjunction with the accompanying drawings.

[0051] As Figure 1 shown, a power grid EMS control method includes the following steps:

[0052] S1. Establish a static CIM model of grid equipment according to the actual electrical wiring diagram of the power grid;

[0053] Among them, the steps of establishing the static CIM model include:

[0054] Establish an EquipmentContainer class according to the grid level to which the equipment belongs;

[0055] Establish an Equipment class in the EquipmentContainer class;

[0056] Add a ConnectivityNode (CN) between the equipment with connection relationships;

[0057] Add a Terminal (T) between the equipment and the connectivity node;

[0058] Establish the measurement attributes corresponding to the equipment.

[0059] The CIM model, that is, the Common Information Model, the General Information Model.

[0060] Among them, the power grid especially refers to the offshore power grid.

[0061] Figure 2 As shown is according to Figure 3 The CIM model formed by the actual power grid shown. Two equipment containers are established according to the voltage level. At the same time, an equipment class is established in the corresponding equipment container, a ConnectivityNode (CN) is added between the equipment with connection relationships, a Terminal (T) is added between the equipment and the ConnectivityNode (CN), and the measurement attributes corresponding to the equipment are established, which can be used as the basis for power grid control of the present invention.

[0062] S2. Transplant the static CIM model of the power grid into the controller of the power grid EMS system;

[0063] Among them, the transplantation refers to calling the CIM model through code. The EMS system, that is, the Energy Management System, the Energy Management System.

[0064] S3. Collect and analyze the measurement data of each switch-type equipment in the power grid through the IO channel of the controller to determine the connection relationship between the equipment in the CIM model, and form an independent topological unit;

[0065] When the detection data of the switch-type equipment is 1, it means that the switch equipment is closed. When the detection data is 0, it means that the switch equipment is open. The equipment in the static CIM model at least includes generators, loads, transformers, switches; the switches include circuit breakers and disconnecting switches.

[0066] S4. Collect and analyze the measurement data of other devices in the power grid, integrate each topological unit and filter out the topological units without power supply to form independent topological islands.

[0067] Obtain the actual operating conditions of the power grid based on the independent topological islands, and calculate the power thermal reserve of the current operating conditions of the power grid; when there is a node open circuit or disconnection and reconnection in the power grid, the IO channels of the controller acquire and analyze the measurement data of each switching device to determine the connection relationship between each device in the CIM model, re-determine the power grid topological structure, adjust the reactive power flow and calculate the thermal reserve. In case of insufficient thermal reserve, trip some nodes in the power grid; and adjust the active and reactive power of the balance bus to make the active and reactive power distribution of the power grid within the required area to reach a new steady-state operating condition. The load nodes defined as trippable will be tripped first; at the same time, the load nodes have been preset with a tripping priority order and are tripped according to the priority level until the thermal reserve is sufficient.

[0068] As Figure 4 shown, provide a power grid EMS control device 100, which can be a controller and includes:

[0069] A static model configuration unit 10, configured to configure a static CIM model of power grid devices according to the actual electrical wiring diagram of the power grid;

[0070] The static model configuration unit 10 is further set to:

[0071] Establish device container classes according to the power grid levels to which the devices belong;

[0072] Establish device classes in the device container classes;

[0073] Add connection points between devices with connection relationships;

[0074] Add terminals between devices and connection points;

[0075] Establish measurement attributes corresponding to the devices;

[0076] Establish a static CIM model of power grid devices according to the actual electrical wiring diagram of the power grid and configure it into the controller.

[0077] The power grid is preferably an offshore power grid.

[0078] A data acquisition unit 20, configured to acquire and analyze the measurement data of switching devices and their respective devices in the power grid;

[0079] A topology analysis unit 30, configured to acquire and analyze the measurement data of each switching device according to the data acquisition unit to determine the connection relationship between devices in the CIM model, form independent topology units; and integrate each topology unit based on the measurement data of other devices in the power grid and filter out the topology units without power sources to form independent topology islands.

[0080] The power grid EMS control device 100 may further include:

[0081] A hot standby management unit, configured to calculate the power hot standby of the current working condition of the power grid; calculate the power hot standby of the current working condition of the offshore power grid based on the actual operating condition of the offshore power grid obtained by the topology analysis unit 30. Hot standby refers to the total power that all generators in the power grid have not been used but can be used. For example, there are 3 generators in the power grid with a maximum available power of 10,000 kW; the actual used power is 6,000 kW; that is, the hot standby is 4,000 kW; the calculation formula for hot standby is as follows:

[0082] P 热备用 =P max -P online

[0083] In the formula: P 热备用 represents the hot standby; P max represents the maximum output of all online generators; P online represents the actual output of all online generators.

[0084] If P 热备用 ≥0, it means that the hot standby is sufficient and there is no need to unload the load.

[0085] If P 热备用 <0, then judge: (1) If P 热备用 + the load that can be unloaded <0, it means that the hot standby + the load that can be unloaded is insufficient, that is, even if all the load that can be unloaded is unloaded, the generator will still be overloaded, and standby generators should be considered to be started; (2) If P 热备用 + the load that can be unloaded ≥0, trip according to the unloading level of the load that can be unloaded until P 热备用 ≥0.

[0086] A priority tripping unit, configured to trip some nodes in the power grid when there is a node open circuit or reclosing in the power grid and the hot standby is insufficient; the emergencies that occur in the power grid include, but are not limited to: generator tripping, disconnection of the tie switch, and line overload; the power energy dispatching and control system automatically completes the tripping according to the emergencies that occur in the power grid to ensure the stability of the power grid. The calculation of the hot standby is the basic condition for the system to execute the priority tripping. The system decides whether to enable the priority tripping function by judging whether the hot standby is sufficient to ensure the stability of the power grid.

[0087] The load suppression unit is used to prevent large loads from starting when the grid's thermal reserve margin cannot meet the impact load demand during the startup of large loads. In this case, the power dispatching and control system will output a blocking signal. The impact of a large load startup on the grid can be divided into active power demand and reactive power demand. For pump loads, the active power demand is 1.5 to 2 times the rated power, and the reactive power demand is 6 to 8 times the rated power. The load suppression unit should have data interfaces for parameters such as the rated (active / reactive) power of large loads, the active power startup multiple, and the reactive power startup multiple. After the load suppression function is put into use, if the grid's thermal reserve margin cannot meet the impact load demand during the startup of large loads, the power dispatching and control system will output a blocking signal to prevent large loads from starting.

[0088] The power management unit is used to adjust the active and reactive powers of the balance bus when there is a node open circuit or reclosing in the grid, so that the active and reactive power distributions of the grid are within the required range and reach a new steady-state operation.

[0089] The power management unit performs the following controls: (1) Active and reactive power distribution control. The active power is distributed according to the equal proportion mode based on the actual maximum output of each generator, and the reactive power is distributed in an in-situ equal proportion manner.

[0090] (2) Power demand and power factor control. It monitors the input / output power of the common grid tie line in real time, calculates the power demand, and then adjusts the AVR to control the reactive power output according to the power factor range to maintain the power factor within a reasonable range while meeting the basic output of the generator.

[0091] (3) Bus frequency and voltage control. It adjusts the output active and reactive powers according to the load changes to maintain the system frequency and voltage.

[0092] The power flow management unit is mainly used to adjust the P and Q of the balance bus (including the bus of the main generator), and adjust the transformer tap or reactive power compensation device to achieve the purpose of adjusting the reactive power flow. The main purposes of the power flow management unit are twofold: one is the power dispatching requirement, mainly based on the grid energy plan and the requirements of equipment switching or equipment commissioning within the region; the other is the networking operation requirement, mainly based on the networking and disconnection of each power station area.

[0093] It may also include a voltage adjustment unit, which is used to adjust the voltage of each node so that its change does not exceed the specified allowable range to ensure the stability level of the power system and the safe and economic operation of various power equipment and electrical appliances. The ways for the voltage adjustment unit to adjust the voltage include:

[0094] (1) Adjust the voltage regulation at the generator terminal. This is achieved by adjusting the excitation to change the reactive power output. The synchronous generator can operate at the rated power within the range of 95% to 105% of the rated voltage.

[0095] (2) Adjust the voltage regulation by changing the transformer turns ratio. When there is sufficient reactive power in the power system, by selecting different tap positions, the voltage transformation ratio of the transformer can be changed, thereby achieving the purpose of voltage regulation.

[0096] (3) Adjust the voltage using reactive power compensation equipment. When there is insufficient reactive power in the power system, various reactive power compensation equipment is applied for voltage regulation.

[0097] The power grid control method and device of the embodiment of the present invention can perform real-time analysis on the topological structure of the power grid and make system adjustments according to the actual operating power grid topology, thus ensuring the safe, stable, efficient, and smooth operation of the power grid.

[0098] The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, this does not limit the scope of the rights of the present invention. Those skilled in the art can implement the present invention in various modified forms without departing from the scope and essence of the present invention. For example, the features of one embodiment can be used in another embodiment to obtain another embodiment. Any modification, equivalent replacement, and improvement made within the technical concept of the present invention shall fall within the scope of the rights of the present invention.

Claims

1. A control method for an offshore power grid EMS, characterized in that including: establishing a static CIM model of grid equipment according to the actual electrical wiring diagram of the grid; the steps for establishing the static CIM model include: establishing equipment container classes according to the grid levels to which the equipment belongs; establishing equipment classes in the equipment container classes; adding connection points between equipment with connection relationships; adding terminals between equipment and connection points; establishing measurement attributes corresponding to the equipment; porting the static CIM model of the grid to the controller of the grid EMS system; real-time collecting and analyzing the measurement data of each switching device in the grid through the IO channels of the controller to determine the connection relationships between the devices in the CIM model, forming independent topological units; and collecting and analyzing the measurement data of other equipment in the grid, integrating each topological unit and filtering out the powerless topological units to form independent topological islands; obtaining the actual operating conditions of the grid based on the independent topological islands and calculating the power hot standby of the current grid conditions; when there is a node open circuit or disconnection and reconnection in the grid, the IO channels of the controller determine the connection relationships between the devices in the CIM model according to the real-time obtained and analyzed measurement data of each switching device to re-determine the grid topological structure; and adjusting the reactive power flow and calculating the hot standby; and adjusting the active and reactive powers of the balance bus to make the active and reactive power distributions of the grid within the required regions to reach a new steady-state operating state.

2. The offshore power grid EMS control method according to claim 1, characterized in that: when the detection data of the switching device is 1, it represents that the switching device is closed, and when the detection data is 0, it represents that the switching device is open.

3. The offshore grid EMS control method according to claim 1, wherein: the equipment in the static CIM model includes at least generators, loads, transformers, switches; among them, the switches include circuit breakers and disconnectors.

4. The offshore power grid EMS control method according to claim 1, characterized in that it further includes the step of: tripping some nodes in the grid when the hot standby is insufficient.

5. An offshore grid EMS control device, including: a static model configuration unit for configuring a static CIM model of grid equipment according to the actual electrical wiring diagram of the grid; the static model configuration unit is further configured to: establish equipment container classes according to the grid levels to which the equipment belongs; establish equipment classes in the equipment container classes; add connection points between equipment with connection relationships; add terminals between equipment and connection points; establish measurement attributes corresponding to the equipment; establish a static CIM model of grid equipment according to the actual electrical wiring diagram of the grid and configure it into the controller; a data acquisition unit for real-time acquiring and analyzing the measurement data of switching devices and other equipment in the grid; a topology analysis unit for determining the connection relationships between the devices in the CIM model according to the measurement data of each switching device acquired and analyzed by the data acquisition unit to form independent topological units; and integrating each topological unit according to the measurement data of other equipment in the grid and filtering out the powerless topological units to form independent topological islands; when there is a node open circuit or disconnection and reconnection in the grid, the IO channels of the controller determine the connection relationships between the devices in the CIM model according to the real-time obtained and analyzed measurement data of each switching device to re-determine the grid topological structure; A hot standby management unit for calculating the power hot standby of the current working condition of the power grid; A power management unit for adjusting the reactive power flow and calculating the hot standby when there is a node open circuit or disconnection and reconnection in the power grid; adjusting the active and reactive powers of the balance bus to distribute the active and reactive powers of the power grid within the required area to reach a new steady-state operation state.

6. The offshore power grid EMS control device according to claim 5, characterized in that It further includes: A priority tripping unit for tripping some nodes in the power grid when there is a node open circuit or disconnection and reconnection in the power grid and the hot standby is insufficient.

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