Offshore oil and gas field power grid energy storage control management system

Abstract

The application discloses an offshore oil and gas field power grid energy storage control management system, which comprises a power grid, a data acquisition unit, a data processing unit and an energy management system. The energy management system performs energy management and optimal scheduling on the energy storage system according to the power grid demand and the state of the energy storage device. The energy storage system comprises an energy storage device, an electric energy converter and a controller. The energy storage device is used for storing electric energy. The controller is used for monitoring the energy storage state of the energy storage device and controlling the energy flow direction and conversion efficiency of the electric energy converter under the instruction of the energy management system. The energy management system performs real-time control on the energy storage device to realize energy management and optimal scheduling of the energy storage system. The real-time control on the energy storage device at least comprises starting charging or discharging, stopping charging or discharging, adjusting power output and changing one or more operation modes. The application improves the stability of the offshore power grid.

Description

Technical Field

[0001] This invention belongs to the field of microgrids in power systems, and particularly relates to an energy storage control and management system for offshore oil and gas field power grids. Background Technology

[0002] Currently, distributed energy applications are increasingly being used in the offshore energy sector. These energy sources are time-varying and volatile, which may lead to instability and unreliability of offshore power systems. Summary of the Invention

[0003] The purpose of this invention is to propose an energy storage control and management system for offshore oil and gas field power grids to solve the problem that offshore oil field power grid systems cannot operate stably and reliably in the prior art.

[0004] To address the aforementioned technical problems, this invention proposes an offshore oil and gas field power grid energy storage control and management system, comprising:

[0005] The power grid is used to supply electrical energy to power equipment in offshore oil and gas fields;

[0006] The data acquisition unit includes multiple data acquisition devices and data monitoring equipment installed in the power grid, used to collect and monitor power grid operating status data;

[0007] The data processing unit is used to receive data obtained by the data acquisition unit, analyze the data, determine the grid demand, and transmit it to the energy management system through the communication network.

[0008] The energy management system manages and optimizes the energy storage system based on grid demand and the status of the energy storage devices.

[0009] An energy storage system includes an energy storage device, a power converter, and a controller. The energy storage device is used to store electrical energy. The controller is used to monitor the energy storage status of the energy storage device and, under the instructions of the energy management system, to control the energy flow and conversion efficiency of the power converter. The energy management system performs real-time control of the energy storage device to achieve energy management and optimized scheduling of the energy storage system. The real-time control of the energy storage device includes at least one or more actions such as starting charging or discharging, stopping charging or discharging, adjusting power output, and changing the operating mode.

[0010] In at least one embodiment, the energy storage device operates in a remote dispatch mode, wherein the remote dispatch mode is as follows:

[0011] Under normal grid-connected operation, the energy storage system receives instructions from the energy management system and charges or discharges according to the dispatch power value P specified in the instructions.

[0012] In at least one embodiment, the energy storage device operates in a primary frequency regulation mode, wherein the primary frequency regulation mode is as follows: when the data acquisition unit detects that the grid frequency f is lower than a set minimum threshold f... min If the data processing unit determines that the power grid is insufficient, the energy management system issues a discharge command to cause the energy storage device to release stored electrical energy to supplement the power grid, until the data acquisition unit detects that the power grid frequency f has returned to its rated value; if the power grid frequency f is detected to be higher than the set maximum threshold f... max If the data processing unit determines that there is excess power in the power grid, the energy management system will issue a charging command to enable the energy storage device to absorb the excess power from the power grid until the data acquisition unit detects that the power grid frequency f has returned to its rated value.

[0013] In at least one embodiment, the operating mode of the energy storage device includes an off-grid to grid-connected mode, which is as follows: after the energy storage device successfully starts up off-grid and the gas generator is connected to the grid, the energy management system sends an instruction to the energy storage device to switch the energy storage device to grid-connected mode.

[0014] In at least one embodiment, the operating mode of the energy storage device includes a reverse power protection mode, which is as follows: when the terminal load of the offshore oil and gas field power grid is disconnected, the energy management system issues a charging command to the energy storage system to avoid the generator set reverse power. The energy storage device stops charging after a set t2 minutes, and then the grid's thermal reserve is used to charge and discharge the energy storage device.

[0015] In at least one embodiment, the operating mode of the energy storage device includes a stable control and precise cutting mode, wherein the stable control and precise cutting mode is as follows:

[0016] When a single unit trips or the grid is disconnected from the offshore platform's power grid, and the grid standby value on the energy storage device side is less than 0, the energy management system sends a hard signal to control the energy storage device to discharge at maximum output for a duration of t1 minutes. After t1 minutes, the grid standby value is recalculated. If it is still less than 0, the energy storage device continues to discharge until the grid standby value is greater than 0. Then, the energy storage device resumes charging or standby mode. The t1 value is set and adjustable through the energy management system.

[0017] In at least one embodiment, the data processing unit is used to receive and process data from the data acquisition unit, including data cleaning, data aggregation and data storage; and to monitor and analyze grid data and energy storage system data in real time to make decisions.

[0018] In at least one embodiment, the data acquisition device includes a sensor, and the data monitoring device includes a power quality monitor.

[0019] In at least one embodiment, the power grid operation status data includes one or more of the following data collected in real time: power generation, output, voltage, current, frequency, and power factor of each power generation device in the offshore oil and gas field power system; charging and discharging power and charging and discharging capacity of the energy storage system; one or more of the following data: voltage, temperature, and battery energy of the battery module; one or more of the following data: current, voltage, power, battery energy, chargeable and dischargeable capacity, and cumulative charging and discharging capacity of the battery cluster; remaining capacity (SOC) and state of health (SOH) of the energy storage battery; grid-connected / off-grid status of the energy storage system; charging / discharging status; and one or more of the following data: active power, reactive power, current, voltage, switching status, and alarms of the load.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] (1) When distributed energy units are connected to an island microgrid, there may be problems with power generation instability. This invention provides a corresponding control scheme. Through the scheduling and energy management of the energy storage system, the disturbance of new energy units to the power grid can be effectively reduced, ensuring the safe operation of the power grid.

[0022] (2) Different grid operating conditions may affect the operation of energy storage systems, such as sudden load increases and grid faults. This invention provides control schemes for these different operating conditions, which respond promptly to grid changes through intelligent scheduling and energy management of the energy storage system, ensuring the safe and stable operation of the grid. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the architecture of an offshore oil and gas field power grid energy storage control and management system. Detailed Implementation

[0024] In this application, the term "data cleaning" refers to the process of detecting and correcting (or deleting) damaged or inaccurate data (data that is obviously abnormal and deviates from common sense), including filling in missing values, detecting and processing outliers, etc.

[0025] In this application, the term "data aggregation" refers to the process of combining multiple data sources or data points to calculate a summary value (depending on the defined metrics) to facilitate analysis and decision-making.

[0026] In this application, the term "black start" refers to the process of gradually restoring power supply through self-starting power generation equipment (such as gas generator sets) in the system without relying on the power supply from the external power grid after all equipment in the power grid has stopped operating due to a fault.

[0027] In this application, the term "grid-connected" refers to the energy storage device being connected to the power grid; correspondingly, the term "off-grid" refers to the energy storage device not being connected to the power grid.

[0028] In this application, the term "grid hot standby value" refers to the maximum output of an online generator in the power grid minus its actual output.

[0029] In this application, the term "hard contact signal" generally refers to a connection point that is directly connected to the monitoring equipment via cable, and these connections can be directly represented on the secondary drawings. Hard contact signals include the position and status of disconnectors and switches, as well as device actions, alarms, and power failure signals. Hard contact signals are signals transmitted through cables.

[0030] The specific implementation of the present invention will be further described below with reference to the accompanying drawings and examples.

[0031] Figure 1 This describes an embodiment of an offshore oil and gas field power grid energy storage control and management system architecture, which includes a power grid, a data acquisition unit, a data processing unit, an energy management system, and an energy storage system. These components, along with other related equipment, are connected via a communication network to enable data transmission between different devices or systems for remote monitoring and management.

[0032] The system comprises several components: a power grid supplying electricity to offshore oil and gas field power equipment; a data acquisition unit including multiple data acquisition devices and monitoring equipment installed on the power grid to collect and monitor power grid operation status data; and a data processing unit receiving data from the acquisition unit, analyzing the data, determining power grid demand, and transmitting it to the energy management system via a communication network. Further, the data processing unit performs data cleaning, aggregation, and storage; and monitors and analyzes power grid operation status data in real time to inform decision-making. Power grid operation status data includes real-time data on the power generation, output, voltage, current, frequency, power factor, charging and discharging power and capacity of the energy storage system for each generator in the offshore oil and gas field power system; voltage, temperature, and energy of battery modules; current, voltage, power, energy, chargeable and dischargeable capacity, and cumulative charge and discharge capacity of battery clusters; remaining capacity (SOC) and state of health (SOH) of energy storage batteries; grid-connected / off-grid status, charging / discharging status of the energy storage system; and active and reactive power, current, voltage, switch status, and alarms of the load. In a power grid, the instruments used to monitor the grid frequency can be one or more power quality monitors. Grid frequency data can be transmitted to the energy storage management system via data communication. Data acquisition devices include sensors, and data monitoring equipment includes power quality monitors. Sensors are responsible for initial data acquisition; power quality monitors perform further data monitoring, displaying the data and outputting signals in the event of a fault.

[0033] An energy management system manages and optimizes the energy storage system based on grid demand and the status of the energy storage devices. The energy storage system includes energy storage devices, power converters, and controllers. The energy storage devices store electrical energy. The controllers monitor the energy storage status of the energy storage devices and, under the instructions of the energy management system, control the energy flow and conversion efficiency of the power converters. For example, it monitors parameters such as battery voltage, current, charge, health status, and grid power, providing real-time feedback on the battery status and usage. Based on the battery's charging and discharging status and the grid's real-time energy demand, it performs charging and discharging control. By monitoring the battery's health, it promptly identifies fault points and issues warning messages to notify relevant personnel for repair or replacement.

[0034] The energy management system performs real-time control of the energy storage device to achieve energy management and optimized scheduling of the energy storage system; the real-time control of the energy storage device includes at least one or more actions such as starting charging or discharging, stopping charging or discharging, adjusting power output, and changing the operating mode.

[0035] The energy storage device operates in two modes: a remote dispatch mode, in which the energy storage system receives instructions from the energy management system and charges or discharges according to the dispatch power value P under normal grid-connected operation; and a primary frequency regulation mode, in which the data acquisition unit detects that the grid frequency f is lower than the set minimum threshold f. min If the data processing unit determines that the power grid is insufficient, the energy management system issues a discharge command to cause the energy storage device to release stored electrical energy to supplement the power grid, until the data acquisition unit detects that the power grid frequency f has returned to its rated value; if the power grid frequency f is detected to be higher than the set maximum threshold f... max If the data processing unit determines that there is excess power in the power grid, the energy management system issues a charging command to the energy storage device to absorb the excess power until the data acquisition unit detects that the grid frequency f has returned to its rated value. In the off-grid to grid-connected mode, after the energy storage device successfully starts off-grid and the gas generator unit is connected to the grid, the energy management system issues a command to the energy storage device to switch to grid-connected operation. In the reverse power protection mode, when a terminal load is disconnected from the offshore oil and gas field power grid, the energy management system issues a charging command to the energy storage system to prevent reverse power from the generator unit. The charging of the energy storage device continues for a set time t2 minutes before stopping, and then the grid's thermal reserve capacity is used to charge and discharge the energy storage device. The stable and precise switching mode means that when a single unit trips or the grid disconnects from the offshore platform's power grid, and the grid standby value on the energy storage device side is less than 0, the energy management system sends a hard signal to control the energy storage device to discharge at maximum output for a duration of t1 minutes. After t1 minutes, the grid standby value is recalculated. If it is still less than 0, the energy storage device continues to discharge until the grid standby value is greater than 0. Then, the energy storage device resumes charging or standby mode. The t1 value is set and adjustable through the energy management system. The data acquisition device includes sensors.

[0036] The introduction of energy storage devices into offshore oil and gas field power grids, along with the efficient storage of electrical energy through these systems, decouples power supply from demand, thereby ensuring a stable and reliable power supply for offshore oil and gas fields and guaranteeing normal production and operation. Through flexible scheduling and energy management of the energy storage system, multiple energy sources (such as wind and solar power) can be integrated into the system, coordinating various energy supplies and achieving efficient energy utilization and diversified supply. Intelligent control of the energy storage system allows for flexible adjustments under different electricity market conditions to minimize electricity costs and improve economic efficiency. The offshore oil and gas field power grid energy storage control and management system of this application, through intelligent control of the energy storage system, can maximize the utilization of power system energy, solve the stability and reliability issues in the offshore energy sector, achieve efficient energy utilization and diversified supply, and improve overall energy utilization efficiency.

[0037] The above embodiments illustrate only one implementation of the present invention, but the implementation of the present invention is not limited to the above examples. It should be noted that any modifications, alterations, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention should be considered equivalent substitutions and fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A power grid energy storage control and management system for offshore oil and gas fields, characterized in that... include: The power grid is used to supply electrical energy to power equipment in offshore oil and gas fields; The data acquisition unit includes multiple data acquisition devices and data monitoring equipment installed in the power grid, used to collect and monitor power grid operating status data; The data processing unit is used to receive the data obtained by the data acquisition unit, analyze the data, determine the power grid demand, and transmit it to the energy management system through the communication network. The energy management system manages and optimizes the energy storage system based on the grid demand and the status of the energy storage device. An energy storage system includes an energy storage device, an energy converter, and a controller; the energy storage device is used to store electrical energy; the controller is used to monitor the energy storage status of the energy storage device and, under the instructions of the energy management system, control the energy flow and conversion efficiency of the energy converter. The energy management system performs real-time control of the energy storage device to achieve energy management and optimized scheduling of the energy storage system; the real-time control of the energy storage device includes at least one or more actions such as starting charging or discharging, stopping charging or discharging, adjusting power output, and changing the operating mode.

2. The offshore oil and gas field power grid energy storage control and management system according to claim 1, characterized in that... The energy storage device operates in a remote dispatch mode, which is as follows: Under normal grid-connected operation, the energy storage system receives instructions from the energy management system and charges or discharges according to the dispatch power value P specified in the instructions.

3. The offshore oil and gas field power grid energy storage control and management system according to claim 1, characterized in that: The energy storage device operates in a primary frequency regulation mode, which is defined as follows: when the data acquisition unit detects that the grid frequency f is lower than a set minimum threshold f... min If the data processing unit determines that the power grid is insufficient, the energy management system issues a discharge command to cause the energy storage device to release stored electrical energy to supplement the power grid, until the data acquisition unit detects that the power grid frequency f has returned to its rated value; if the power grid frequency f is detected to be higher than the set maximum threshold f... max If the data processing unit determines that there is excess power in the power grid, the energy management system will issue a charging command to enable the energy storage device to absorb the excess power from the power grid until the data acquisition unit detects that the power grid frequency f has returned to its rated value.

4. The offshore oil and gas field power grid energy storage control and management system according to claim 1, characterized in that... The energy storage device operates in an off-grid to grid-connected mode. In the off-grid to grid-connected mode, after the energy storage device successfully starts up off-grid and the gas generator is connected to the grid, the energy management system sends a command to the energy storage device to switch it to grid-connected mode.

5. The offshore oil and gas field power grid energy storage control and management system according to claim 1, characterized in that... The operation mode of the energy storage device includes a reverse power protection mode. The reverse power protection mode is as follows: when the terminal load of the offshore oil and gas field power grid is disconnected, the energy management system issues a charging command to the energy storage system to avoid the generator set reverse power. The energy storage device stops charging after a set t2 minutes, and then the grid's thermal reserve is used to charge and discharge the energy storage device.

6. The offshore oil and gas field power grid energy storage control and management system according to claim 1, characterized in that: The energy storage device operates in a stable and precise control mode, which is as follows: When a single unit trips or the grid is disconnected from the offshore platform's power grid, and the grid standby value on the energy storage device side is less than 0, the energy management system sends a hard signal to control the energy storage device to discharge at maximum output for a duration of t1 minutes. After t1 minutes, the grid standby value is recalculated. If it is still less than 0, the energy storage device continues to discharge until the grid standby value is greater than 0. Then, the energy storage device resumes charging or standby mode. The t1 value is set and adjustable through the energy management system.

7. The offshore oil and gas field power grid energy storage control and management system according to claim 1, characterized in that: The data processing unit includes data cleaning, data aggregation, and data storage; and real-time monitoring and analysis of power grid data and energy storage system data to make decisions.

8. The offshore oil and gas field power grid energy storage control and management system according to claim 1, characterized in that: The data acquisition device includes sensors, and the data monitoring equipment includes a power quality monitor.

9. The offshore oil and gas field power grid energy storage control and management system according to claim 1, characterized in that: The power grid operation status data includes one or more of the following data collected in real time in the offshore oil and gas field power system: power generation, output, voltage, current, frequency, and power factor of each power generation device; charging and discharging power and capacity of the energy storage system; voltage, temperature, and energy of the battery module; current, voltage, power, energy, chargeable and dischargeable capacity, and cumulative charging and discharging capacity of the battery cluster; remaining capacity (SOC) and state of health (SOH) of the energy storage battery; grid-connected / off-grid status of the energy storage system; charging / discharging status; and one or more of the following data: active power, reactive power, current, voltage, switch status, and alarms of the load.

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