CN117543654A - Direct power compensation system for micro-grid of oil drilling platform - Google Patents
Direct power compensation system for micro-grid of oil drilling platform Download PDFInfo
- Publication number
- CN117543654A CN117543654A CN202311522393.8A CN202311522393A CN117543654A CN 117543654 A CN117543654 A CN 117543654A CN 202311522393 A CN202311522393 A CN 202311522393A CN 117543654 A CN117543654 A CN 117543654A
- Authority
- CN
- China
- Prior art keywords
- power
- grid
- storage device
- output
- energy storage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 67
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 124
- 238000004146 energy storage Methods 0.000 claims abstract description 85
- 239000003345 natural gas Substances 0.000 claims abstract description 62
- 238000006243 chemical reaction Methods 0.000 claims description 36
- 238000001514 detection method Methods 0.000 claims description 34
- 238000001914 filtration Methods 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 21
- 239000003208 petroleum Substances 0.000 claims description 16
- 238000004364 calculation method Methods 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims description 15
- 230000007423 decrease Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
- H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
- H02J2310/58—The condition being electrical
- H02J2310/60—Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
Abstract
A direct power compensation system for an oil drilling platform micro-grid belongs to the technical field of stable operation of the oil drilling platform micro-grid. The invention solves the problem of poor stability of the existing grid-connected inverter when the power compensation is performed in the micro-grid of the oil drilling platform. The power regulation system adopts the energy storage device to charge and discharge, adopts the PWM inverter module to invert the direct current electric signal output by the energy storage device and then is integrated into the micro-grid of the oil drilling platform; the central controller calculates real-time differential power according to the real-time output power of the natural gas generator set and the real-time load power of the micro-grid of the oil drilling platform, controls the power adjustment system to compensate the real-time differential power, adjusts the output power of the natural gas generator set in real time until the differential power is zero, and stops power compensation. The invention is suitable for power control of the micro-grid of the oil drilling platform.
Description
Technical Field
The invention belongs to the technical field of micro-grid stable operation of an oil drilling platform.
Background
The natural gas generator has the characteristics of high reliability, high efficiency, low maintenance, low emission and the like, and can be used for avoiding the use of multiple fuels in a single fuel form, such as natural gas, oilfield associated gas, diesel oil and the like. Therefore, the micro-grid composed of the natural gas generator and the energy storage device is widely focused in the petroleum drilling industry. Currently, the main drilling power system in the petroleum drilling industry is constituted by diesel engines. But the diesel generator set has the characteristics of high energy consumption, high cost, serious emission pollution and the like. In contrast, natural gas is a clean energy source, and compared with a diesel engine, the emission of toxic gas and pollutant particles of the natural gas engine is less under the same power. In addition, diesel oil consumed by a single drilling machine accounts for more than one third of the drilling cost each year. In summary, a drilling power system using a natural gas engine as a power source is the most valuable choice for the oil drilling industry at present.
In micro-grid, it is very important to ensure the power generation stability of the natural gas generator set, especially the impact load can appear when the drill rod works, and the phenomenon that the frequency of the micro-grid is unstable can be caused after the generator set receives the impact load. For natural gas generator sets, if their power angle or relative speed deviates too much from the operating point, this can lead to loss of synchronization between the generator and the microgrid, which in turn damages the rotor. Thus, when the micro-grid is subjected to impact load, an additional energy storage device must be used to release the energy required by the load, which translates the problem of compensating the impact load of the micro-grid into a problem of controlling the energy storage device. At present, however, the power compensation strategies for the impact load are algorithms based on steady-state power, which cannot be optimally compensated for short-time high-power impact loads. The reason for this is that the power control theory of the grid-connected inverter is not perfect enough, and it is difficult to cope with some special load demands. Analysis summarizes the research results of some research institutions, especially some of the technical advanced company production energy compensation devices in the European and American countries, and although the technology of hardware is advanced, some control strategies are needed to solve the problems.
There are two main control modes for grid-connected inverters: one is to directly control the current to regulate its grid-tied power while using a phase-locked loop to obtain the grid voltage phase. The other is to directly regulate grid-connected power by controlling the voltage vector and phase of the inverter. Currently, the voltage source mode is generally based on droop control or virtual synchronous generator to simulate the electromagnetic characteristics of the actual synchronous generator, and further control the same according to the characteristics of the generator. The vector amplitude and phase of the output voltage of the current source mode is externally regulated by the power supply. In summary, the current source frequency converter is suitable for a strong power grid, and stability under a weak power grid is reduced. The voltage source inverter has better stability in weak grids and is unstable in strong grids.
Disclosure of Invention
The invention aims to solve the problem that the existing grid-connected inverter has poor stability when performing power compensation in an oil drilling platform micro-grid, and provides a direct power compensation system for the oil drilling platform micro-grid.
The invention relates to a direct power compensation system for an oil drilling platform micro-grid, which also comprises a central controller and a power adjustment system;
the power adjustment system adopts an energy storage device to charge and discharge, adopts a PWM inverter module to invert the direct current electric signal output by the energy storage device and then is integrated into an oil drilling platform micro-grid;
the central controller calculates real-time differential power according to the real-time output power of the natural gas generator set and the real-time load power of the micro-grid of the oil drilling platform, controls the power adjustment system to compensate the real-time differential power, adjusts the output power of the natural gas generator set in real time until the differential power is zero, and stops power compensation.
Further, in the invention, the power adjustment system comprises an energy storage device, a direct current conversion switch module, a PWM inverter module, an inverter filtering module, an energy storage device voltage detection module, a direct current converter driving circuit, a direct current bus voltage detection module, a PWM inverter driving circuit, an output voltage and current detection and power calculation module, an energy storage device energy manager and a power compensation controller;
the energy storage device charges or discharges;
the energy storage device is integrated into the petroleum drilling micro-grid through the direct-current conversion switch module and the PWM inverter module;
the direct current conversion switch module is used for respectively carrying out direct current conversion on the currents received at the two sides and outputting the converted currents;
the PWM inverter module is used for converting a received direct current signal into an alternating current signal, and converting the received alternating current signal into a direct current signal; transmitting the converted alternating current signal to an oil drilling micro-grid;
the energy storage device voltage detection module is used for detecting the output voltage of the energy storage device;
the direct current detection module is used for detecting the current output by the energy storage device;
the energy storage device energy manager is used for calculating the switching control rate of direct current conversion according to the terminal voltage and the output current of the energy storage device and the differential power sent by the central controller;
the direct-current converter driving circuit is used for generating a direct-current converted PWM driving signal according to the direct-current converted switching control rate; transmitting the PWM driving signal of the direct current conversion to a direct current conversion switch module;
the direct current bus voltage detection module is used for collecting direct current bus voltage signals of the power adjustment system;
the output voltage and current detection and power calculation module is used for collecting three-phase voltage and current signals output by the power adjustment system and calculating the total power output by the power adjustment system by utilizing the three-phase voltage and current signals;
the power compensation controller is used for calculating the control rate of the PWM inverter according to the total power output by the power adjustment system, the direct current bus voltage and current signal and the difference power sent by the central controller;
the PWM inverter driving circuit is used for converting the control rate of the PWM inverter into an inverted PWM driving signal and outputting the inverted PWM driving signal to the PWM inverter module.
Further, the invention further comprises a direct current conversion filtering module, wherein the direct current conversion filtering module is connected in series between the energy storage device and the direct current conversion switch module and is used for filtering the input and output currents of the energy storage device.
Further, the invention further comprises a direct current filter capacitor, wherein the direct current filter capacitor is connected in series between the direct current conversion switch module and the PWM inverter module, and the direct current filter capacitor is used for filtering the received direct current signal.
Further, the invention further comprises an inverter filtering module, wherein the inverter filtering module is connected in series between the PWM inverter module and the petroleum drilling micro-grid and is used for filtering the alternating current electric signals output by the PWM inverter module and the input alternating current electric signals.
Further, the invention also comprises a voltage and current detection and output power calculation module and a gas turbine controller, wherein the voltage and current detection and output power calculation module is used for detecting the voltage and current output by the natural gas generator set and calculating the output power of the natural gas generator set by utilizing the voltage and current;
the gas turbine controller is used for calculating an output power adjusting signal of the natural gas generator set according to the output power of the natural gas generator set and the differential power sent by the central controller, and transmitting the adjusting signal to the natural gas generator set.
Further, in the invention, the petroleum drilling micro-grid also supplies power for the domestic power grid.
Further, in the invention, when load impact load shedding occurs on the petroleum drilling micro-grid, the output power of the natural gas generator set is larger than the load power, the power adjustment system is charged to absorb redundant power, the central controller controls the output power of the natural gas generator set to be gradually reduced, the absorption power of the power adjustment system is gradually reduced along with the reduction, and the charging of the power adjustment system is stopped until the output power of the natural gas generator set and the load power reach balance.
Further, in the invention, the central controller also receives the output voltage and current signals of the energy storage device sent by the energy storage device energy manager, the sent direct current bus voltage of the power compensation controller, the output power of the PWM inverter module, the real-time output power of the gas turbine unit sent by the gas turbine controller and the real-time load power of the petroleum drilling power grid, calculates differential power, and sends the differential power to the energy storage device energy manager, the power compensation controller and the gas turbine controller.
Further, in the invention, the energy storage device adopts a battery, a super capacitor or a flywheel energy storage device.
The invention compensates or absorbs the output power of the natural gas generator set by utilizing the rapidity of charging and discharging of the energy storage device, can realize instantaneous compensation of impact load, ensures that the voltages of the alternating current bus and the direct current bus do not drop or rise, and ensures that the frequency of the micro-grid is stable. The invention can be applied to the petroleum drilling industry and any micro-grid scene with impact load working conditions, and has wide application prospect and great popularization value.
Drawings
FIG. 1 is a schematic block diagram of a system according to the present invention;
FIG. 2 is a schematic circuit diagram of a compensation device according to an embodiment;
FIG. 3 is a block diagram of an embodiment instantaneous direct power fast compensation control system.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The first embodiment is as follows: referring to fig. 1, a direct power compensation system for an oil drilling platform micro-grid according to the present embodiment includes: the system comprises an oil drilling micro-grid and a natural gas generator set (301), wherein the natural gas generator set (301) converts chemical energy of natural gas into electric energy and then is integrated into the oil drilling platform micro-grid;
the power control system is characterized by also comprising a central controller 2 and a power adjustment system 1;
the power adjustment system 1 adopts an energy storage device to charge and discharge, adopts a PWM inverter module (105) to invert the direct current electric signal output by the energy storage device and then is integrated into an oil drilling platform micro-grid;
the central controller 2 calculates real-time differential power according to the real-time output power of the natural gas generator set and the real-time load power of the micro-grid of the oil drilling platform, controls the power adjustment system 1 to compensate the real-time differential power, adjusts the output power of the natural gas generator set 301 in real time until the differential power is zero, and the power adjustment system 1 stops power compensation.
The invention aims to enhance the impact load resistance of a micro-grid for an oil drilling platform. When impact load occurs in the micro-grid, the energy storage device is utilized to output power and quickly balance the power with the load power, so that the system is kept stable. Then, as the output power of the natural gas engine is gradually increased, the output power of the compensation unit is gradually reduced until the output power and the load power of the natural gas generator reach a new balance. In the process, the voltage of the direct current bus is kept constant, each control parameter of the natural gas generator set is timely adjusted, and the system can stably operate. When impact load shedding occurs in the micro-grid, the energy storage device unit can rapidly start to absorb energy, the absorbed energy gradually decreases along with the adjustment of the output power of the natural gas generator set, and finally, new balance is achieved, so that the reliable operation of the system is ensured.
Further, in the present invention, the power adjustment system 1 includes an energy storage device 101, a dc conversion switch module 103, a PWM inverter module 105, an inverter filter module 106, an energy storage device voltage detection module 107, a dc current detection module 108, a dc converter driving circuit 109, a dc bus voltage detection module 110, a PWM inverter driving circuit 111, an output voltage current detection and power calculation module 112, an energy storage device energy manager 113, and a power compensation controller 114;
the energy storage device 101 is charged or discharged;
the energy storage device 101 is integrated into an oil drilling micro-grid through a direct-current conversion switch module 103 and a PWM inverter module 105;
the dc conversion switch module 103 is configured to perform dc conversion on the currents received at two sides, and output the converted currents;
the PWM inverter module 105 is configured to convert a received dc signal into an ac signal, and the received ac signal is converted into a dc signal; transmitting the converted alternating current signal to an oil drilling micro-grid;
the energy storage device voltage detection module 107 is configured to detect an output voltage of the energy storage device 101;
the direct current detection module 108 is configured to detect a current output by the energy storage device 101;
the energy storage device energy manager 113 is configured to calculate a switching control rate of the dc conversion according to the terminal voltage and the output current of the energy storage device 101 and the differential power sent by the central controller 2;
the dc converter driving circuit 109 is configured to generate a PWM driving signal for dc conversion from the switching control rate of the dc conversion; and transmitting the dc-converted PWM driving signal to the dc conversion switch module 103;
the direct current bus voltage detection module 110 is used for collecting direct current bus voltage signals of the power adjustment system 1;
the output voltage and current detection and power calculation module 112 is configured to collect three-phase voltage and current signals output by the power adjustment system 1, and calculate total power output by the power adjustment system 1 using the three-phase voltage and current signals;
the power compensation controller 114 is used for calculating the control rate of the PWM inverter according to the total power output by the power adjustment system 1, the dc bus voltage and current signal and the differential power sent by the central controller 2;
the PWM inverter driving circuit 111 converts the control rate of the PWM inverter into an inverted PWM driving signal, and outputs the inverted PWM driving signal to the PWM inverter module 105.
Further, in the present invention, the dc conversion filtering module 102 is further included, and the dc conversion filtering module 102 is connected in series between the energy storage device 101 and the dc conversion switch module 103, and is used for filtering the input/output current of the energy storage device 101.
Further, in the present invention, the dc filter capacitor 104 is further included, and the dc filter capacitor 104 is connected in series between the dc conversion switch module 103 and the PWM inverter module 105, so that the dc filter capacitor 104 is used for filtering the received dc signal.
Further, the invention further comprises an inverter filtering module 106, wherein the inverter filtering module 106 is connected in series between the PWM inverter module 105 and the petroleum drilling micro-grid and is used for filtering the ac electric signal output by the PWM inverter module 105 and the input ac electric signal.
Further, in the present invention, the system further includes a voltage and current detection and output power calculation module 302 and a gas turbine controller 303, where the voltage and current detection and output power calculation module 302 is configured to detect a voltage and a current output by the natural gas generator set 301, and calculate an output power of the natural gas generator set 301 using the voltage and current;
the gas turbine controller 303 is configured to calculate an output power adjustment signal of the natural gas generator set 301 according to the output power of the natural gas generator set 301 and the differential power sent by the central controller 2, and transmit the adjustment signal to the natural gas generator set 301.
Further, in the invention, the petroleum drilling micro-grid also supplies power for the domestic power grid.
Further, in the present invention, when load impact load shedding occurs on the petroleum drilling micro-grid, the output power of the natural gas generator set 301 is greater than the load power, the power adjustment system 1 charges, and absorbs the redundant power, the central controller 2 controls the output power of the natural gas generator set 301 to gradually decrease, and the power adjustment system 1 absorbs the power gradually decreases until the output power of the natural gas generator set 301 and the load power reach balance, and the charging of the power adjustment system 1 is stopped.
Further, in the present invention, the central controller 2 also receives the output voltage and current signals of the energy storage device sent by the energy storage device energy manager 113, the sent dc bus voltage of the power compensation controller 114, the output power of the PWM inverter module, the real-time output power of the gas turbine unit sent by the gas turbine controller 303, and the real-time load power of the petroleum drilling grid, calculates the differential power, and sends the differential power to the energy storage device energy manager 113, the power compensation controller 114, and the gas turbine controller 303.
Further, in the present invention, the energy storage device 101 is a battery, a super capacitor or a flywheel energy storage device.
The natural gas generator set converts chemical energy of natural gas into electric energy and then directly incorporates the electric energy into the micro-grid of the oil drilling platform. The micro-grid of the oil drilling platform supplies power to the asynchronous motor through the frequency converter, and the motor is connected with the drill rod through the stranded wire wheel.
The voltage detection of the energy storage device converts the output voltage of the energy storage device into a weak current signal and then inputs the weak current signal into the energy storage device energy management controller, and the direct current detection converts the output current of the energy storage device into a weak current signal and then inputs the weak current signal. Meanwhile, the energy management controller of the energy storage device inputs a control signal into the driving circuit of the direct current converter to generate a PWM signal, and inputs the signal into the direct current conversion switch module to realize energy management and control of the energy storage device. The DC bus voltage detection module converts the detected voltage of the DC filter capacitor into a weak current signal and inputs the weak current signal into the power compensation controller, and the output voltage current detection and power calculation module converts the grid-connected current and voltage of the inverter integrated into the micro-grid into the weak current signal and inputs the weak current signal into the power compensation controller and calculates the input power of the inverter. The power compensation controller calculates given reference values of current and voltage according to the input power signal, and inputs the given reference values to the PWM inversion driving circuit. The PWM inversion driving circuit outputs PWM signals to the PWM inverter module to realize direct power control of the inverter. The voltage and current detection and power calculation module converts the detected voltage signal into a weak current signal and inputs the weak current signal into the gas turbine controller, and the gas turbine controller adjusts the output voltage of the natural gas generator set according to the input voltage signal.
The fuel flow digital signal output by the gas turbine controller is converted into an analog signal through the DA output circuit, the fuel system receives the analog signal to change the fuel flow of the natural gas generator set, and the control of the system rotating speed is realized by changing the fuel flow. The energy storage device energy management controller, the power compensation controller and the gas turbine controller transmit corresponding calculation data to the central controller through the CAN bus on one hand, and meanwhile, the energy storage device energy management controller, the power compensation controller and the gas turbine controller also receive instructions of the central controller. And the central controller calculates the shortage power of the micro-grid of the drilling platform under the impact load effect, and distributes the shortage power to the energy storage device and the natural gas generator set to realize the power balance of the micro-grid.
The specific implementation process is shown in fig. 2, and the natural gas generator set is directly integrated into the micro-grid. The drilling power system comprises a frequency converter module, an asynchronous motor, a stranded wire wheel and a drill rod. The frequency converter module adopts two three-phase half-bridge topologies, wherein V7-V18 are switching tubes, D7-D18 are corresponding freewheeling diodes, and C is a direct current filter capacitor. The asynchronous motor is directly connected with the rear stage of the frequency converter. The asynchronous motor is connected with the oil drill pipe through a stranded wire and a stranded wire wheel. The energy storage device unit comprises an energy storage device, a direct current converter filter and a direct current conversion switch module. The direct-current conversion switch module adopts a buck-boost bidirectional converter circuit single topology structure, V0 is a switch tube, and D0 is a corresponding freewheeling diode. The direct current filter inductance is denoted as Ldc, and Rdc is the corresponding resistance. The energy storage device can be equivalently used as various energy sources, such as a battery, a super capacitor, flywheel energy storage and the like. The output current of the energy storage device is ies 0, the terminal voltage is udc, and the filtered current is ies. The inversion switch module has the function of converting direct current into three-phase symmetrical alternating current and supplying power to the petroleum drilling micro-grid. The inverter switch module structure adopts a three-phase half-bridge topology, V1-V6 are switch tubes, D1-D6 are corresponding freewheeling diodes, lf is a filter inductance of the inverter output filter module, rf is a corresponding resistor, and Cf is a filter capacitance of the inverter output filter module. The inverter outputs three-phase currents ia0, ib0 and ic0, and outputs three-phase voltages ua0, ub0 and uc0.
The control method of the direct power compensation device for the micro-grid of the oil drilling platform comprises the following steps of: standby mode, compensation mode and charging mode.
In standby mode, the petroleum drilling drill rod does not have drilling operation at the moment, the petroleum drilling micro-grid only bears life electricity of a well team, the electricity consumption is gentle at the moment, and the natural gas generator set can provide electric energy to maintain stable operation of the micro-grid. At this time, the energy storage device does not deliver current to the power grid, i.e. the transmitted active power is zero.
The compensation mode is a main working mode of a direct power compensation device for an oil drilling platform micro-grid. When the system enters the compensation mode, the impact load generated by the operation of the drill rod causes larger frequency fluctuation on the micro-grid of the oil drilling platform, and at the moment, the natural gas generator set cannot provide matched active power instantaneously due to the softer power generation characteristic of the natural gas generator set, so that the micro-grid can maintain stable operation. The frequency difference of the micro-grid is maintained within a certain range by the power required by the output load of the compensation system in a short time until the output power of the natural gas generator set is equal to the impact load power, and the compensation device reduces the output power until the compensation process is exited. In the whole action process of the compensation device, the sum of the output power of the compensation device and the output power of the generator is always balanced with the load power.
In the charging mode, the energy of the energy storage device needs to be rapidly released to maintain the micro-grid power balance in the compensation mode, and after the impact load is over, the energy storage device needs to be charged, and the charging current is far smaller than the discharging current in the compensation mode. The charging current is equivalent to the energy storage device as a smaller power load, so that the micro-grid cannot be overloaded, and the frequency of the micro-grid is still maintained within a stable range in the charging process of the energy storage device. The energy storage device after the charging is completed enters a standby mode and waits for the next opening of the compensation mode.
FIG. 3 is a block diagram of a system for direct power control of a compensation system in an implementation, wherein a nonlinear adaptive multi-input and multi-output controller is designed to control the output power of the compensation system. The control objective of the compensation system is to achieve a minimum deviation of the frequency or no fluctuation. The controller designed by the invention does not contain a grid-connected phase-locked loop. The reference value of the bus frequency was designed to be 50Hz and the effective voltage value was designed to be 810V. The natural gas generator provides voltage and frequency support for the micro-grid through excitation and valve control, and the compensation device realizes power compensation through frequency self-adaptive control. The vector control strategy of the direct power is to collect the voltage and current on the bus and then calculate the instantaneous active power and reactive power output by the natural gas generator set; and collecting the active power and the reactive power output by the inverter, and then calculating the instantaneous active power and the instantaneous reactive power output by the compensation system. The vector control technology of the PWM inverter can be used for realizing the instantaneous active and reactive power vector control strategy without a phase-locked loop. According to the established system model, the active power and the reactive power output by the inverter are functions of the direct-axis current and the quadrature-axis current and the frequency, so that calculated values of the active power and the reactive power are used as feedback and power expected values to make differences. This ensures that the output power of the inverter can converge to the desired value in a limited time. In the control algorithm designed by the invention, the standby state is used as the expected value of the power, and the other states are used as the disturbance of the power, so that the convergence characteristic of the system is ensured. The change rate of the active power and the reactive power along with time is calculated and used as a compensation factor of the compensation device. The compensation factor characterizes the action state of the natural gas power generation system, and when the compensation factor is larger than zero, the natural gas power generator is increasing the output power, and the compensation power should be gradually reduced by the compensation system, and the same is true. In the whole dynamic control process, the strategy for directly controlling according to the change rate of the system state variable can fundamentally improve the response speed of the compensation system.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.
Claims (10)
1. The direct power compensation system for the micro-grid of the oil drilling platform is characterized by comprising a central controller (2) and a power adjustment system (1);
the power adjustment system (1) adopts an energy storage device to charge and discharge, adopts a PWM inverter module (105) to invert the direct current electric signal output by the energy storage device and then is integrated into an oil drilling platform micro-grid;
the central controller (2) calculates real-time differential power according to the real-time output power of the natural gas generator set and the real-time load power of the micro-grid of the petroleum drilling platform, controls the power adjusting system (1) to compensate the real-time differential power, adjusts the output power of the natural gas generator set (301) in real time until the differential power is zero, and the power adjusting system (1) stops power compensation.
2. The direct power compensation system for an oil drilling platform micro grid according to claim 1, wherein the power adjustment system (1) comprises an energy storage device (101), a direct current conversion switch module (103), a PWM inverter module (105), an inverter filter module (106), an energy storage device voltage detection module (107), a direct current detection module (108), a direct current converter drive circuit (109), a direct current bus voltage detection module (110), a PWM inverter drive circuit (111), an output voltage current detection and power calculation module (112), an energy storage device energy manager (113), and a power compensation controller (114);
the energy storage device (101) is charged or discharged;
the energy storage device (101) direct-current conversion switch module (103) and the PWM inverter module (105) are integrated into an oil drilling micro-grid;
the direct current conversion switch module (103) is used for respectively carrying out direct current conversion on the currents received at two sides and outputting the converted currents;
the PWM inverter module (105) is used for converting a received direct current signal into an alternating current signal, and converting the received alternating current signal into a direct current signal; transmitting the converted alternating current signal to an oil drilling micro-grid;
the energy storage device voltage detection module (107) is used for detecting the output voltage of the energy storage device (101);
the direct current detection module (108) is used for detecting the current output by the energy storage device (101);
the energy storage device energy manager (113) is used for calculating the switching control rate of direct current conversion according to the terminal voltage and the output current of the energy storage device (101) and the differential power sent by the central controller (2);
a DC converter drive circuit (109) for generating a DC converted PWM drive signal from a DC converted switching control rate; and transmitting the DC-converted PWM driving signal to a DC conversion switch module (103);
the direct current bus voltage detection module (110) is used for collecting direct current bus voltage signals of the power adjustment system (1);
the output voltage and current detection and power calculation module (112) is used for collecting three-phase voltage and current signals output by the power adjustment system (1), and calculating the total power output by the power adjustment system (1) by utilizing the three-phase voltage and current signals;
the power compensation controller (114) is used for calculating the control rate of the PWM inverter according to the total power output by the power adjustment system (1), the direct current bus voltage and current signal and the differential power sent by the central controller (2);
the PWM inverter drive circuit (111) converts the control rate of the PWM inverter into an inverted PWM drive signal, and outputs the inverted PWM drive signal to the PWM inverter module (105).
3. The direct power compensation system for an oil drilling platform micro grid according to claim 2, further comprising a direct current conversion filtering module (102), wherein the direct current conversion filtering module (102) is connected in series between the energy storage device (101) and the direct current conversion switching module (103) and is used for filtering input and output currents of the energy storage device (101).
4. A direct power compensation system for an oil drilling platform micro grid according to claim 2 or 3, further comprising a direct current filter capacitor (104), the direct current filter capacitor (104) being connected in series between the direct current conversion switch module (103) and the PWM inverter module (105) for the direct current filter capacitor (104) to filter the received direct current signal.
5. A direct power compensation system for an oil drilling platform micro-grid according to claim 2 or 3, further comprising an inverter filtering module (106), the inverter filtering module (106) being connected in series between the PWM inverter module (105) and the oil drilling micro-grid for filtering the ac electrical signal output by the PWM inverter module (105) and the input ac electrical signal.
6. The direct power compensation system for an oil rig micro grid according to claim 1, further comprising a voltage and current detection and output power calculation module (302) and a gas turbine controller (303), wherein the voltage and current detection and output power calculation module (302) is configured to detect a voltage and current output by a natural gas generator set (301) and calculate an output power of the natural gas generator set (301) using the voltage and current;
the gas turbine controller (303) is used for calculating an output power adjustment signal of the natural gas generator set (301) according to the output power of the natural gas generator set (301) and the differential power sent by the central controller (2), and transmitting the adjustment signal to the natural gas generator set (301).
7. The direct power compensation system for an oil drilling platform microgrid of claim 1 wherein the oil drilling microgrid also powers a utility power grid.
8. The direct power compensation system for the micro-grid of the oil drilling platform according to claim 1, wherein when load impact load shedding occurs on the micro-grid of the oil drilling platform, the output power of the natural gas generator set (301) is larger than the load power, the power adjustment system (1) is charged to absorb redundant power, the central controller (2) controls the output power of the natural gas generator set (301) to gradually decrease, the absorbed power of the power adjustment system (1) gradually decreases until the output power of the natural gas generator set (301) and the load power reach balance, and charging of the power adjustment system (1) is stopped.
9. The direct power compensation system for an oil drilling platform micro grid according to claim 1, wherein the central controller (2) is configured to receive an output voltage current signal of the energy storage device sent by the energy storage device energy manager (113), direct current bus voltage sent by the power compensation controller (114), output power of the PWM inverter module, real-time output power of the gas turbine unit sent by the gas turbine controller (303), and real-time load power of the oil drilling grid, calculate differential power, and send the differential power to the energy storage device energy manager (113), the power compensation controller (114), and the gas turbine controller (303).
10. The direct power compensation system for an oil rig micro grid according to claim 2, characterized in that the energy storage device (101) employs a battery, a super capacitor or a flywheel energy storage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311522393.8A CN117543654A (en) | 2023-11-15 | 2023-11-15 | Direct power compensation system for micro-grid of oil drilling platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311522393.8A CN117543654A (en) | 2023-11-15 | 2023-11-15 | Direct power compensation system for micro-grid of oil drilling platform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117543654A true CN117543654A (en) | 2024-02-09 |
Family
ID=89781942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311522393.8A Pending CN117543654A (en) | 2023-11-15 | 2023-11-15 | Direct power compensation system for micro-grid of oil drilling platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117543654A (en) |
-
2023
- 2023-11-15 CN CN202311522393.8A patent/CN117543654A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108832612B (en) | DC micro-grid control method and system based on hierarchical management | |
| CN102983589B (en) | Control method of grid friendly type distributed power source based on hybrid energy storage | |
| CN105207258B (en) | A kind of photovoltaic direct-current micro-grid energy cooperative control device | |
| CN108683213B (en) | Inertia compensator based on virtual synchronous generator rotor inertia power decoupling | |
| CN103606942B (en) | A kind of mixed liquor stream energy-storage system with no-power compensation function | |
| CN104810857A (en) | Single-phase grid-connected photovoltaic power generation system output power smooth control device and control method | |
| CN102148501B (en) | Disturbance generation device for wind power station | |
| Virulkar et al. | Integrated battery controller for distributed energy system | |
| Zhao et al. | Bus voltage control strategy for low voltage DC microgrid based on AC power grid and battery | |
| CN102916435A (en) | Battery energy-storage power conversion system containing Z source network and control method therefor | |
| CN102122833B (en) | Power supply method of non-master/slave self-current-sharing grid-connected parallel uninterrupted power supply system | |
| Xinghua et al. | A Pi-based control scheme for primary cascaded H-bridge rectifier in transformerless traction converters | |
| CN111525828B (en) | Control method of bidirectional isolation type resonant power converter based on virtual synchronous motor | |
| CN203574386U (en) | Multilevel multiport power generation and energy storage hybrid apparatus | |
| CN111611696A (en) | Nonlinear modeling method of micro-grid system | |
| CN113675893B (en) | Unplanned island mode switching and harmonic compensation device and control method thereof | |
| Nie et al. | Direct drive wave energy converters integrated with a composite energy storage system | |
| Li et al. | A hybrid energy system using cascaded H-bridge converter | |
| CN117543654A (en) | Direct power compensation system for micro-grid of oil drilling platform | |
| CN114421451A (en) | VDCM parallel coordination control method based on SOC (System on chip) equalization algorithm | |
| Kinjo et al. | Output leveling of wind power generation system by EDLC energy storage system | |
| CN202172283U (en) | No master-slave self current-balancing grid-connected parallel uninterrupted power system | |
| CN103084724B (en) | Contravariant accelerating power supply device of electron beam depositing equipment and control method thereof | |
| Hiray et al. | Controller design for supercapacitor as energy storage in medium voltage AC system | |
| CN202888854U (en) | Battery energy storage power conversion system comprising Z source network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |