Electro-hydraulic hybrid linkage power supply system of electric net drill and control method

Abstract

The invention discloses an oil-electricity hybrid linkage power supply system and a control method for a network electric drill, and belongs to the technical field of oil field network electricity land drilling machine system optimization control. Aiming at the power supply and consumption characteristics of the grid electricity drilling machine, on the basis of the energy flow characteristics of the grid electricity drilling machine system, the power grid side, the diesel generating sets and the grid electricity drilling machine oil-electricity hybrid linkage power supply system are linked, a multi-source coordination control algorithm is adopted, the starting number of the diesel generating sets is selected according to the power consumption capacity gap, and flexible power adjustment is conducted; with the purpose of minimizing the power utilization cost during operation of the grid electricity drilling machine, stable power output of the diesel generating set is balanced, the optimal economic operation mode is achieved, and mutual impact of currents of a power grid side and the diesel generating set is prevented; the problems that an existing single power supply cannot meet the electricity demand of the grid electricity drilling machine, cost is high, and cooperative power supply production efficiency is low are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield grid-electric land drilling rig system optimization control, and in particular to a grid-electric drilling rig oil-electric hybrid linkage power supply system and a control method. Background Art

[0002] The statements in this section merely mention background art related to the present invention and do not necessarily constitute prior art.

[0003] Grid-powered drilling rigs are mainly used for special operations such as exploration and drilling. Their operating positions are not fixed, they need to be moved frequently, and they consume a lot of electricity. Based on the above working characteristics of grid-powered drilling rigs, when the power supply capacity of the oilfield power grid is small, the power supply radius is insufficient, the line distance is long, or the line equivalent impedance is large, the voltage drop caused by the same load is large, which cannot meet the high-power load use of grid-powered drilling rigs.

[0004] At present, the grid-electric drilling rig equipment is mainly operated by switching between the grid and diesel generators. When the load power is small, the grid is connected through 6kV or 10kV overhead lines, and the grid-electric drilling rig equipment is provided with power through the transformer; when the load power increases, the grid is cut off because the load power exceeds the voltage fluctuation range allowed by the grid-electric drilling rig equipment, and the backup diesel generator is used to supply power to meet the operation needs, but this will increase the cost. In addition, the diesel generator should not be operated with load whether it is started or stopped, especially the operation with load when stopped, which will cause serious damage to the crankshaft and the cooling system of the unit; therefore, the diesel generator set is currently started and stopped mostly by manual operation, which greatly affects the production efficiency.

[0005] If the grid-powered drilling rig equipment is jointly powered by the power grid and the backup diesel generator, the directly parallel grid and the generator set will impact each other and cannot be used normally. The start and stop of the backup diesel generator will cause a greater impact on the grid.

[0006] In addition, you can also consider using a zoned power supply method to supply power to the power load in the grid-powered drilling rig system in different areas, with the power grid and diesel generators respectively supplying some equipment. This method requires manual operation and maintenance, with a large workload and a low degree of intelligence. It is only suitable for grid-powered drilling rigs with a low degree of automation. It is impossible to achieve zoned power supply for high-power, highly automated devices using full-frequency drive. Summary of the invention

[0007] In order to solve the deficiencies of the prior art, the present invention provides an oil-electric hybrid power supply system and control method for a grid-electric drilling rig, which can realize free and smooth switching of power supply equipment of the grid-electric drilling rig system, reduce the electricity cost of the grid-electric drilling rig system, and improve power supply reliability.

[0008] In a first aspect, the present invention provides an oil-electric hybrid linkage power supply system for a grid-electric drilling rig; A grid-electric drilling rig oil-electric hybrid linkage power supply system, comprising: A monitoring module, the monitoring module is used to collect real-time current value and real-time voltage value of the network power drilling rig system in the network power drilling rig system; An energy storage module, which is used to compensate for instantaneous load fluctuations when the diesel generator set is started; A main control module, the main control module is used to obtain the real-time current value and the real-time voltage value and determine the real-time active power of the grid-electric drilling rig system; if the real-time active power is greater than a preset modulation threshold, a power supply command signal is generated and sent to the coordination control module; A coordination control module, the coordination control module is used to control the energy storage module to supply power to the grid-powered drilling rig system according to the power supply instruction signal, and then start the diesel generator set, so that the diesel generator set is put into operation at zero load, and the coordinated power supply of the grid-side power supply and the diesel generator set is realized; so that the diesel generator set is put into operation at zero load, and the coordinated power supply of the grid-side power supply and the diesel generator set is realized; The modulation threshold is dynamically adjusted using the real-time voltage and real-time current of the grid connection point and the maximum load capacity of the grid.

[0009] In some embodiments, it further comprises: The main control module is used to compare the real-time active power with the preset fluctuation control range, and if the real-time active power exceeds the preset fluctuation control range, send a first command signal to the coordination control module, and the coordination control module controls the charging and discharging of the energy storage module according to the first command signal; The real-time power within a preset time period is processed by normal distribution to determine the fluctuation control range.

[0010] In some embodiments, if the real-time active power exceeds a preset fluctuation control range and the duration exceeds a preset time threshold, the main control module sends a second command signal to the coordination control module, and the coordination control module controls the energy storage module to supply power to the grid-powered drilling rig system and simultaneously starts the diesel generator set at zero load.

[0011] In some embodiments, dynamically adjusting the modulation threshold according to the maximum power supply capacity, real-time current value, and real-time voltage value of the oil-electric hybrid linkage power supply system of the grid-electric drilling rig includes: Sampling the real-time voltage value and the real-time current value, and calculating the three-phase voltage effective value and the three-phase current effective value based on the sampling results; According to the effective value of the three-phase voltage and the effective value of the three-phase current, the real-time maximum power supply capacity of the oil-electric hybrid linkage power supply system of the grid-electric drilling rig is determined by using the power supply capacity of the oil-electric hybrid linkage power supply system of the grid-electric drilling rig and the effective value of the minimum operating voltage of the grid-electric drilling rig system; The modulation threshold is generated according to the maximum power supply capacity and in combination with the real-time power factor of the oil-electric hybrid linkage power supply system of the grid-electric drilling rig.

[0012] In some embodiments, the modulation threshold is expressed as: ; In the formula, represents the modulation threshold, Indicates the maximum load capacity of the power grid. represents the reliability coefficient, Represents the average power factor of the power grid, Indicates the average power factor angle.

[0013] In some implementations, if the real-time active power is greater than a preset modulation threshold, generating a power supply instruction signal and sending it to the coordination control module specifically includes: If the real-time active power is greater than the preset modulation threshold, the power consumption capacity gap is used to determine the number of diesel generator sets to be started and the output power of the energy storage module, and a power supply command signal is generated and sent to the coordination control module.

[0014] In some embodiments, after the diesel generator set is started, the method further comprises: The monitoring module is used to collect the output current of the diesel generator set, and the main control module is used to determine the output power of the diesel generator set based on the output current; an adjustment signal is generated according to the output power and sent to the coordination control module, and the coordination control module adjusts the output power of the energy storage module according to the adjustment signal.

[0015] In some embodiments, the energy storage module includes a bidirectional converter and an energy storage unit, the AC side of the bidirectional converter is connected in parallel with the grid-powered drilling rig system and the grid-side power supply, and the DC side of the bidirectional converter is connected in parallel with the energy storage unit.

[0016] In some embodiments, the bidirectional converter is used to compensate the energy storage unit for energy through the grid-side power supply after the diesel generator set is shut down.

[0017] In a second aspect, the present invention provides a method for controlling oil-electric hybrid linkage power supply of a grid-electric drilling rig; A method for controlling oil-electric hybrid linkage power supply of a grid-electric drilling rig, comprising: Acquire the real-time current value and the real-time voltage value and determine the real-time active power of the grid-electric drilling rig system; If the real-time active power is greater than the preset modulation threshold, a power supply command signal is generated and sent to the coordination control module; the coordination control module is used to control the energy storage module to supply power to the grid-powered drilling rig system according to the power supply command signal, and then start the diesel generator set to put the diesel generator set into zero load, thereby realizing the coordinated power supply of the grid-side power supply and the diesel generator set; The modulation threshold is dynamically adjusted using the real-time voltage and real-time current of the grid connection point and the maximum load capacity of the grid.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The technical solution provided by the present invention links the grid-side power supply, the diesel generator set and the grid-electric drilling rig oil-electric hybrid power supply system to achieve integrated control of the above-mentioned devices, minimize the electricity cost during the operation of the grid-electric drilling rig, and realize the intelligent operation of the drilling rig of the grid-electric drilling rig system.

[0019] 2. The technical solution provided by the present invention adopts a multi-source coordinated control algorithm based on the power supply and consumption characteristics of the grid-powered drilling rig, selects the number of diesel generator sets to be started according to the power capacity gap and performs flexible power adjustment, and uses energy storage modules to adjust the grid-connected power and reactive power, thereby achieving smooth switching between the diesel generator sets and the grid-side power supply, achieving stable output of the grid-powered drilling rig system power, and preventing mutual impact between the grid-side power supply and the diesel generator set current.

[0020] 3. The technical solution provided by the present invention fully compensates for the reactive power of the grid-powered drilling rig system while utilizing the energy storage module for coordinated control to balance load fluctuations, reduce the impact of load shocks on the grid, and improve power supply reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 A schematic diagram of the access to the oil-electric hybrid power supply system for a grid-electric drilling rig provided in an embodiment of the present invention; Figure 2 A schematic diagram of the system architecture of the oil-electric hybrid power supply system for a grid-electric drilling rig provided in an embodiment of the present invention; Figure 3 A schematic diagram of a flow chart of obtaining a modulation threshold value provided by an embodiment of the present invention; Figure 4 A schematic diagram of a control flow of reactive power compensation provided by an embodiment of the present invention; Figure 5A schematic diagram of a process flow for processing abnormal power grid fluctuations in a multi-source coordinated control algorithm provided by an embodiment of the present invention; Figure 6 A schematic diagram of a process for processing power excess in a multi-source coordinated control algorithm provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0024] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0025] Embodiment 1 The existing grid-electric drilling rig power supply system uses a single power supply source for power supply under different load conditions, which cannot meet the load requirements, has high power supply costs and the power supply quality needs to be improved; therefore, the present invention provides a grid-electric drilling rig oil-electric hybrid linkage power supply system, which is connected to the grid-electric drilling rig power supply system in parallel with the power grid and the diesel generator set, and the grid side, the diesel generator set and the grid-electric drilling rig oil-electric hybrid linkage power supply system are linked, and multi-source coordinated control is performed in combination with the real-time working conditions of the grid-electric drilling rig system, thereby reducing electricity costs and achieving smooth operation and smooth switching of power supply between the grid side and the diesel generator set, thereby avoiding serious safety accidents caused by the impact between the diesel generator set and the grid-side power supply.

[0026] Next, combine Figure 1-Figure 6 , a grid-electric drilling rig oil-electric hybrid linkage power supply system disclosed in this embodiment is described in detail. The grid-electric drilling rig oil-electric hybrid linkage power supply system includes a monitoring module, a coordination control module, an energy storage module and a main control module, the monitoring module is communicatively connected to the main control module, the main control module is communicatively connected to the coordination control module, and the coordination control module is communicatively connected to the energy storage module; the energy storage module includes a bidirectional converter and an energy storage unit, the DC side of the bidirectional converter is connected in parallel with a plurality of energy storage units, the AC side of the bidirectional converter is connected in parallel with the grid-side power supply and the grid-electric drilling rig system, and a grid-side switch is provided between the grid-side power supply and the grid-electric drilling rig system; the diesel generator set, the grid-side power supply, the grid-electric drilling rig system and the grid-electric drilling rig oil-electric hybrid linkage power supply system are connected to the grid via the grid connection point M, and the grid-electric drilling rig system is supplied with power via the grid.

[0027] The monitoring module is used to monitor the rapid load changes of the grid-electric drilling rig system, diesel generator set and grid-side power supply. Specifically, the current transformer CT1 collects the current and voltage values ​​of the grid-electric drilling rig system in real time and transmits them to the main control module through the signal acquisition circuit. The current sensor CT2 collects the output current value of the energy storage unit in real time and feeds it back to the main control module for parameter correction. The output current of the diesel generator set is collected through the current sensor CT3, and the load-side current of the diesel generator set is collected through the current sensor CT4 and transmitted to the main control module through the signal acquisition circuit; the voltage value of the grid connection point is collected through the voltage sensor PT1. Through multi-source monitoring, a data basis is provided for the closed-loop adjustment of the oil-electric hybrid linkage power supply system of the grid-electric drilling rig.

[0028] The main control module is used to obtain the real-time current value and real-time voltage value of the grid-powered drilling rig system, and determine the real-time active power P of the grid-powered drilling rig system based on the real-time current value and real-time voltage value; if the real-time active power P is less than the preset modulation threshold value P1, a power supply command signal is generated and sent to the grid-side power supply, and the grid-powered drilling rig system is powered by the grid-side power supply; if the real-time active power P is greater than the preset modulation threshold value P1, a power supply command signal is generated and sent to the grid-side power supply and the coordination control module; the coordination control module is used to start the diesel generator set according to the power supply command signal and control the energy storage module to power the grid-powered drilling rig system during the startup process, so that the diesel generator set is put into operation at zero load, thereby realizing the coordinated power supply of the grid-side power supply and the diesel generator set.

[0029] In this embodiment, the main control module is used to analyze and process the real-time power consumption data of the grid-powered drilling rig system, and decisions are made based on this to control the actions of the diesel generator set, the grid-side power supply and the energy storage module, thereby achieving rapid active support for the grid-powered drilling rig system and smoothing the active power fluctuations of the system, thereby stabilizing the power supply voltage of the power grid.

[0030] As an implementation mode, if the real-time active power P is less than the preset modulation threshold P1, a power supply instruction signal is generated and sent to the grid-side power supply; if the real-time active power P is greater than the preset modulation threshold P1, a power supply instruction signal is generated and sent to the grid-side power supply and the coordination control module. Specifically: If the real-time active power P1 is less than the preset modulation threshold P, a power supply instruction signal is generated and sent to the grid-side power supply, that is, the grid-side power supply is fully used to power the grid-powered drilling rig system.

[0031] If the real-time active power P1 is greater than the preset modulation threshold P, the capacity gap of electricity consumption is determined according to the real-time active power P1 and the modulation threshold P; according to the capacity gap of electricity consumption, the capacity of the diesel generator and the economic operation coefficient of the diesel generator, the number of diesel generator sets to be started is determined and a power supply instruction signal is generated and sent to the grid-side power supply and the coordination control module; that is, the entire capacity of the grid-side power supply is output to the grid-powered drilling rig power supply system, and at the same time, the coordination control module issues instructions to the diesel generator sets to start the corresponding number of diesel generators; since the use of diesel engines will inevitably lead to grid fluctuations, during the startup process of the diesel generator sets, the energy storage module is controlled to supply power to the grid-powered drilling rig system, so that the load of the diesel generator sets during the startup process is 0, that is, the power of the grid connection point M is close to 0, and the diesel generator sets are connected to the grid at no load.

[0032] After the diesel generator set is connected to the grid, the main control module is also used to determine the output power of the diesel generator set according to the output current of the diesel generator set; according to the output power and the capacity gap of electricity consumption, an adjustment signal is generated and sent to the coordination control module, and the coordination control module adjusts the output current of the energy storage module according to the adjustment signal. Specifically, according to the power gap between the real-time output power of the diesel generator set and the capacity gap of electricity consumption, the output power of the converter is regulated, and the energy storage unit is used for compensation, and the power is gradually redistributed to the diesel generator set.

[0033] In this embodiment, the power supply command signal is a start control command. When the power of the grid-side power supply is seriously insufficient, the diesel generator set is started through the coordination control module, and the instantaneous power throughput is adjusted by regulating the converter and the energy storage module according to the power gap to achieve energy balance.

[0034] Furthermore, when the real-time active power P recovers to less than the modulation threshold P1, the coordination control module sends a control instruction to the energy storage module, so that the energy storage module supplies power to the grid-powered drilling rig system, and then sends a shutdown signal to the diesel generator set, and the diesel generator set exits; subsequently, the output of the energy storage module is gradually reduced. After the energy storage module exits power supply, when the real-time active power P is less than the modulation threshold P1, energy compensation is performed for the energy storage unit through the bidirectional converter.

[0035] In order to make the linkage control more in line with the operating status of the grid-powered drilling rig system, the main control module can adaptively adjust the modulation threshold P according to the real-time working conditions of the grid-powered drilling rig system and the power supply capacity of the power supply system.

[0036] As an implementation method, it also includes: dynamically adjusting the modulation threshold P according to the real-time maximum power supply capacity, real-time current value and real-time voltage value of the oil-electric hybrid linkage power supply system of the grid-electric drilling rig. The specific process is as follows: (1) The real-time voltage and current values ​​collected are sampled at 512 sampling points in each cycle. Based on the real-time voltage sampling results, the three-phase voltage effective value U1 is calculated respectively. The samples are sampled for 50 consecutive cycles to obtain U2. The difference between U2 and the initial voltage value set by the grid power drilling rig system is calculated to obtain the voltage difference ΔU. Based on the real-time voltage sampling results, the three-phase current instantaneous value I1 is calculated respectively and the root mean square value is calculated for 50 consecutive cycles. Taking the phase 0° of the A phase voltage as the reference, the X component and Y component are decomposed by the amplitude and phase of the current to decompose the active current I of each cycle. x and reactive current I y , and according to the formula Calculate the system equivalent impedance and .

[0037] Here, 50 cycles are used to sample a voltage data value in 1 second.

[0038] (2) Calculate the modulation threshold based on the sampled data and the system's power supply capacity.

[0039] For example, the specific calculation process is as follows: (201) Construct the expression formula of the grid connection point voltage, which is: ; In the formula, Indicates the grid voltage, Indicates the grid-connected point current, Indicates the power supply voltage, is the equivalent resistance of the power grid, is the equivalent reactance of the power grid, represents the load equivalent resistance, represents the load equivalent reactance, Represents the imaginary part.

[0040] (202) The formula in (201) is expressed in the form of real part and imaginary part as follows: ; In the formula, represents the x component of the grid connection point voltage, represents the x component of the grid voltage, represents the x component of the grid-connected point current, represents the y component of the grid connection point voltage, Represents the y component of the grid-connected point current.

[0041] For the 50 sets of data sampled in (1), they are organized into a matrix form, expressed as: ; Then we have: ; (203) Obtain the grid power supply capacity S and the effective value of the minimum operating voltage of the grid-powered drilling rig And calculate the maximum load capacity of the power grid , then the maximum load capacity of the power grid It is expressed as: ; In the formula, It represents the average effective value of the x-axis component of the power supply voltage, and RMS represents the sign of the effective value.

[0042] Here, It represents the maximum load that the grid can use to ensure the normal operation of the grid-powered drilling rig when only the grid-side power supply is connected to the grid.

[0043] (204) Considering that a certain capacity and power factor are reserved to ensure the stability of the power grid, the preset threshold value P1 is expressed as: ; In the formula, is the reliability coefficient, greater than 1, is the average power factor of the power grid, is the average power factor angle.

[0044] In this embodiment, the optimal modulation threshold that meets the needs of the system is calculated in real time based on the automatically detected data, thereby improving the level of intelligence and automation.

[0045] In order to ensure the power stability of the grid-side power supply and the power supply of the network point drilling system, as an implementation method, it also includes: During the operation of the grid-powered drilling rig system, the main control module is also used to compare the real-time active power P of the grid-powered drilling rig system with the preset fluctuation control range. When the real-time active power P exceeds the upper limit P2+σ of the fluctuation control range, the main control module sends a first command signal (discharge command signal) to the coordination control module, and the coordination control module controls the energy storage module to discharge and output active power to offset the excess part; when the real-time active power P is lower than the lower limit P2-σ of the fluctuation control range, the main control module sends a first command signal (charge command signal) to the coordination control module, and the coordination control module controls the energy storage module to charge and absorb active power to offset the excess part; the smooth output of the power at the grid connection point is realized, and the impact of load fluctuations on the power grid is reduced.

[0046] Here, the calculation process of the fluctuation control range is specifically as follows: obtain the active power of the grid-connected drilling rig system within a certain period of time, and based on the active power within a certain period of time, calculate the average power P2 and the fluctuation threshold σ according to the law of normal distribution. Finally, the fluctuation control range is obtained as {P2-σ, P2+σ}.

[0047] Exemplarily, the average power P2 is expressed as: ; The fluctuation threshold σ is expressed as: ; In the formula, Indicates the active power of the grid-electric drilling rig system, Indicates the number of sampling points of active power.

[0048] In this embodiment, when the power grid fluctuates or a voltage sag occurs, resulting in insufficient power output on the grid side, the charging and discharging of the energy storage module is used to achieve smooth power control for short-term fluctuations, thereby ensuring stable power on the grid side and power supply on the load side.

[0049] Furthermore, if the fluctuation overlimit time is greater than the preset time threshold t1 or the grid-side power output is seriously insufficient (the grid output is far less than the modulation threshold P1), the coordination control module increases the output power of the energy storage module, reduces the grid connection point power, starts the diesel generator, ensures the low load input of the diesel generator set, and reduces the impact on the diesel generator set; then the power supply is transferred to the diesel generator set, and then the grid-side power supply is disconnected.

[0050] When the grid-side power supply is stable, the coordination control module adjusts the phase of the diesel generator set, and gradually adjusts the phase of the power supply point with the grid-side power supply phase. When the two are consistent, the grid-side switch is closed, and the power supply is gradually adjusted to the grid-side power supply, and then the diesel generator set is cut off.

[0051] In order to stabilize the power supply voltage of the grid-powered drilling rig system and reduce the demand for the power supply capacity of the grid, in this embodiment, an energy storage module is also used to compensate for the real-time reactive power on the load side of the grid-powered drilling rig system.

[0052] As an implementation method, the real-time reactive power on the load side of the electric drilling rig system of the compensation network specifically includes: According to the analytical result in (2), the active current I x and reactive current I y , combined with the average power factor of the power grid, determine the compensation reactive current I q And issue the full compensation instantaneous value instruction. By issuing the compensation instantaneous value instruction, the power electronic device in the bidirectional converter is pulse-width modulated through optical fiber communication to control the current value output by the bidirectional converter.

[0053] Here, the compensation reactive current Iq It is expressed as: .

[0054] Compensating reactive power mainly reduces the load's occupation of the power grid and diesel generator power supply capacity. Although reactive power does not consume energy, it occupies equipment capacity. At the same time, reactive power will cause reactive voltage drop in the line, affecting the stable operation of the system.

[0055] At the same time, the full compensation instantaneous value instruction is corrected based on the monitored real-time voltage and real-time current through the voltage instantaneous PI regulator and the current instantaneous PI regulator, so that the energy storage module outputs current according to the corrected full compensation instantaneous value instruction.

[0056] In this embodiment, the bidirectional converter is composed of high-power power electronic devices to achieve rapid regulation of bidirectional energy; the main control module controls and communicates with the bidirectional converter through an optical fiber expansion board, the main control module and the coordination control module are transmitted through optical fiber, and the coordination control module interacts with the diesel generator set through RS485 communication to achieve start and stop control of the diesel generator.

[0057] Voltage and current regulation is mainly to correct the instructions and improve the control accuracy of the whole system. Furthermore, the main control module realizes two-way communication with the human-computer interaction unit through RS485, communicates and interacts with the energy storage unit through RS232 / 485, collects the voltage, temperature, power and other parameters of the supercapacitor of the energy storage unit, and provides RS485 / GPRS interface for background or remote monitoring.

[0058] Embodiment 2 Based on the oil-electric hybrid linkage power supply system of the grid-electric drilling rig described in the first embodiment, this embodiment discloses a grid-electric hybrid linkage power supply control method for the grid-electric drilling rig, including the following steps: S1. Obtain the real-time current value and real-time voltage value of the grid-electric drilling rig system and determine the real-time active power of the grid-electric drilling rig system; if the real-time active power is greater than a preset modulation threshold, execute S2; otherwise, execute S3.

[0059] The modulation threshold is dynamically adjusted using the real-time voltage and current of the grid connection point and the maximum load capacity of the grid.

[0060] S2. Generate a power supply command signal and send it to the coordination control module; the coordination control module is used to control the energy storage module to supply power to the grid-powered drilling rig system according to the power supply command signal, and then start the diesel generator set to put the diesel generator set into zero load, thereby realizing the coordinated power supply of the grid-side power supply and the diesel generator set.

[0061] S3, generating a power supply command signal and sending it to the grid-side power supply, so that the grid-side power supply can fully supply power to the grid-powered drilling system.

[0062] The specific implementation details of the oil-electric hybrid linkage power supply control method for the grid-electric drilling rig described in this embodiment have been involved in the first embodiment and will not be repeated here.

[0063] The description of each embodiment in the above embodiments has different emphases. For parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grid-electric drilling rig oil-electric hybrid linkage power supply system, characterized in that: include: A monitoring module, the monitoring module is used to collect real-time current value and real-time voltage value of the grid-electric drilling rig system; An energy storage module, which is used to compensate for instantaneous load fluctuations when the diesel generator set is started; A main control module, the main control module is used to obtain the real-time current value and the real-time voltage value and determine the real-time active power of the grid-electric drilling rig system; if the real-time active power is greater than a preset modulation threshold, a power supply command signal is generated and sent to the coordination control module; A coordination control module, the coordination control module is used to control the energy storage module to supply power to the grid-powered drilling rig system according to the power supply instruction signal, and then start the diesel generator set, so that the diesel generator set is put into use at zero load, thereby realizing coordinated power supply between the grid-side power supply and the diesel generator set; The modulation threshold is dynamically adjusted using the real-time voltage and real-time current of the grid connection point and the maximum load capacity of the grid.

2. The oil-electric hybrid power supply system for a grid-electric drilling rig according to claim 1, characterized in that: Also includes: The main control module is used to compare the real-time active power with the preset fluctuation control range, and if the real-time active power exceeds the preset fluctuation control range, send a first command signal to the coordination control module, and the coordination control module controls the charging and discharging of the energy storage module according to the first command signal; The real-time power within a preset time period is processed by normal distribution to determine the fluctuation control range.

3. The oil-electric hybrid power supply system for a grid-electric drilling rig as claimed in claim 2, characterized in that: If the real-time active power exceeds the preset fluctuation control range and the duration exceeds the preset time threshold, the main control module sends a second command signal to the coordination control module, and the coordination control module controls the energy storage module to supply power to the grid-powered drilling rig system and starts the diesel generator set at zero load.

4. The oil-electric hybrid power supply system for a grid-electric drilling rig according to claim 1, characterized in that: Dynamically adjusting the modulation threshold using the real-time voltage and real-time current of the grid connection point and the maximum load capacity of the grid includes: Sampling the real-time voltage value and the real-time current value of the grid-connected point, and calculating the three-phase voltage effective value and the three-phase current effective value based on the sampling results; According to the effective value of three-phase voltage and three-phase current, the maximum load capacity of the power grid is determined by using the power supply capacity of the power grid and the effective value of the minimum operating voltage of the power grid drilling system; The modulation threshold is generated according to the maximum load capacity of the power grid and the average power factor of the power grid.

5. The oil-electric hybrid power supply system for a grid-electric drilling rig according to claim 1, characterized in that: The modulation threshold is expressed as: ； In the formula, represents the modulation threshold, Indicates the maximum load capacity of the power grid. represents the reliability coefficient, Represents the average power factor of the power grid, Indicates the average power factor angle.

6. The oil-electric hybrid power supply system for a grid-electric drilling rig according to claim 1, characterized in that: If the real-time active power is greater than the preset modulation threshold, generating a power supply instruction signal and sending it to the coordination control module is specifically: If the real-time active power is greater than the preset modulation threshold, the power consumption capacity gap is used to determine the number of diesel generator sets to be started and the output power of the energy storage module, and a power supply command signal is generated and sent to the coordination control module.

7. The oil-electric hybrid power supply system for a grid-electric drilling rig according to claim 1, characterized in that: After the diesel generator set is started, it also includes: The monitoring module is used to collect the output current of the diesel generator set, and the main control module is used to determine the output power of the diesel generator set based on the output current; an adjustment signal is generated according to the output power and sent to the coordination control module, and the coordination control module adjusts the output power of the energy storage module according to the adjustment signal.

8. The oil-electric hybrid power supply system for a grid-electric drilling rig according to claim 1, characterized in that: The energy storage module includes a bidirectional converter and an energy storage unit. The AC side of the bidirectional converter is connected in parallel with the grid-powered drilling rig system and the grid-side power supply, and the DC side of the bidirectional converter is connected in parallel with the energy storage unit.

9. The oil-electric hybrid power supply system for a grid-electric drilling rig as claimed in claim 8, characterized in that: The bidirectional converter is used to compensate the energy storage unit for energy through the grid-side power supply after the diesel generator set is shut down.

10. A method for controlling oil-electric hybrid power supply of a grid-electric drilling rig, characterized in that: include: Obtaining the real-time current value and real-time voltage value of the grid-electric drilling rig system and determining the real-time active power of the grid-electric drilling rig system; If the real-time active power is greater than the preset modulation threshold, a power supply command signal is generated and sent to the coordination control module; the coordination control module is used to control the energy storage module to supply power to the grid-powered drilling rig system according to the power supply command signal, and then start the diesel generator set to put the diesel generator set into zero load, thereby realizing the coordinated power supply of the grid-side power supply and the diesel generator set; The modulation threshold is dynamically adjusted using the real-time voltage and real-time current of the grid connection point and the maximum load capacity of the grid.

Images