CN202679286U - A pumping unit well group control system based on a DC bus - Google Patents

A pumping unit well group control system based on a DC bus Download PDF

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Publication number
CN202679286U
CN202679286U CN2012202225025U CN201220222502U CN202679286U CN 202679286 U CN202679286 U CN 202679286U CN 2012202225025 U CN2012202225025 U CN 2012202225025U CN 201220222502 U CN201220222502 U CN 201220222502U CN 202679286 U CN202679286 U CN 202679286U
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China
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control
bus
energy
module
rod
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薛胜东
张加胜
秦延才
刘向军
刘鹏
田承村
王兴俊
张玲
王涛
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China Petroleum and Chemical Corp
Sinopec Shengli Oilfield Co Hekou Oil Extraction Plant
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China Petroleum and Chemical Corp
Sinopec Shengli Oilfield Co Hekou Oil Extraction Plant
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Abstract

The utility model provides a pumping unit well group control system based on a DC bus. The pumping unit well group control system based on DC bus comprises a transformer, a rectifying and filtering device, and multiple inverter terminal controllers. A high voltage is reduced to a three-phase AC supply with 380V or middle-high voltage by the transformer. The rectifying and filtering device converts the three-phase AC supply into DC electric energy. The multiple inverter terminal controllers convert the DC electric energy into AC electric energy in order to provide the AC electric energy for multiple pumping units and monitors and controls running conditions of the multiple inverter terminal controllers in real time. The pumping unit well group control system based on a DC bus resolves problems of bad effect and high cost of a conventional device and has advantages of high energy-saving efficiency, low manufacturing cost, capability of preventing substantial fluctuation and overvoltage of the voltage of the DC bus, and long-distance unboosted power transmission of one-drive-more wells.

Description

Rod-pumped well group control system based on dc bus
Technical field
The utility model relates to the rod-pumped well group control system, particularly relates to a kind of rod-pumped well group control system based on dc bus.
Background technology
The various Detection ﹠ Controling modes of at present domestic relevant oil pumper and drive motors are varied, such as, to improve technique, to improve inversion speed-governing device, indicator diagram measurement analyzer, slip electric motor, pole changing that recovery ratio is equipped with as purpose as oil pumper; For oil pumper owing to be in for a long time the problem that effect is low, power factor is low due to " low load with strong power " state, for energy-saving and cost-reducing and Energy Saving Control motor, step-down that adopt are energy-conservation and Δ/Y connection control, and oil pumper is controlled to realize energy-conservation so-called energy-saving device etc. by batch (-type).Fairly perfect Converse speed regulation apparatus and supporting indicator diagram measurement analyzer etc. are with it mainly adopted in external control around oil pumper, by inversion speed-governing device and multifunction control system, both can satisfy preferably the requirement of oil production technology, and can reach again effective energy-conservation purpose.The inversion control cabinet of each Oilfield using has difference and impact on technology and the performance in following several respects at home: at first, as the AC-DC-AC inverter structure, it hands over-and the circuit structure of straight rectification and filtering link is different, for the size of net side power factor and on the harmonic pollution degree of electrical network direct impact is arranged.Secondly, for the SPWM control of inversion link and the algorithm difference of Regulation Control, directly affect the step-down energy-saving effect of realizing under oil pumper " low load with strong power " state.Again, the inversion control cabinet has two kinds of different processing modes and configuration configuration usually to the uneven energy regenerative of oil pumper: the one, and in the power consumption of DC side access brake resistance, circuit is simple; The 2nd, friendship-straight rectification and filtering link adopt the PWM Reversible Rectifiers with the motor feed-in of falling generated energy electrical network, and uneven energy regenerative is reclaimed, and avoid the waste of energy.Latter's technical difficulty is larger, and cost is also higher.In addition, because the technological means that adopts is different, the control cubicle cost is also different, but totally it seems, the inversion control cabinet is on the high side, and each oil recovery factory is difficult to accept, and this also is the main cause that the inversion control cabinet is difficult to the large tracts of land extensive use at present.We have invented a kind of new rod-pumped well group control system based on dc bus for this reason, have solved above technical problem.
Summary of the invention
It is high that the purpose of this utility model provides a kind of energy-saving efficiency, can prevent fluctuating widely and overvoltage of DC bus-bar voltage, and can realize the rod-pumped well group control system based on dc bus of not boosting and transmitting electricity of remote " one drag many " oil well.
The purpose of this utility model can be achieved by the following technical measures: based on the rod-pumped well group control system of dc bus, should comprise transformer based on the rod-pumped well group control system of dc bus, straightening and filtering unit and a plurality of inversion terminal control unit, this transformer is reduced to 380V or mesohigh three-phase alternating-current supply with high-tension electricity, this straightening and filtering unit is converted to direct current energy with these three AC power, a plurality of inputs of these a plurality of inversion terminal control units are connected in the output of this straightening and filtering unit in parallel by common DC bus, a plurality of outputs connect respectively a plurality of oil pumpers, these a plurality of inversion terminal control units are converted to AC energy with this direct current energy, for these a plurality of oil pumpers provide this AC energy, and to the ruuning situation real time monitoring of this inversion terminal control unit, control.
The purpose of this utility model also can be achieved by the following technical measures:
Should also comprise high-voltage switch gear based on the rod-pumped well group control system of dc bus, this high-voltage switch gear is connected in this transformer, the electric power break-make between control high-tension cable and this transformer.
Should also comprise air switch based on the rod-pumped well group control system of dc bus, this air switch connects the input of this transformer and this straightening and filtering unit, controls the electric power break-make between this transformer and this straightening and filtering unit.
This straightening and filtering unit comprises rectifier and filter, and this rectifier is converted to this direct current energy with these three AC power, and this filter is with this direct current energy filtering.
This inversion terminal control unit comprises the power converter main circuit; detection and protection module and single chip control module; the input of this power converter main circuit is connected with the output of this straightening and filtering unit; output is connected with this pumping-unit motor; it is converted to this AC energy with this direct current energy; for this pumping-unit motor provides this AC energy; and absorb overvoltage energy on this common DC bus; this detection and protection module are connected in the test side of this power converter main circuit; its parameter to the motor of this oil pumper detects in real time; and detection signal is transferred to this single chip control module; this single chip control module receives this detection signal; and judge the operating state of this motor, this AC energy that provides to control this power converter main circuit according to this detection signal.
This power converter main circuit comprises that dc bus input filter capacitor, charge protection unit, SPWM inverter and overvoltage absorb protected location; this dc bus input filter capacitor is with this direct current energy filtering; impulse current when this charge protection unit absorption has just powered on because of this dc bus input filter capacitor; this SPWM inverter is converted to this AC energy with this direct current energy, and this overvoltage absorption protected location absorbs the overvoltage energy on this common DC bus.
This detection and protection module sound and light alarm occurs automatically sending under the abnormal conditions at this motor.
This single chip control module is used 16 dsPIC30F series DSP single-chip microcomputers and high-frequency PWM control mode.
This inversion terminal control unit also comprises driver module and uneven energy regenerative conservation treatment module; the input of this driver module is connected in the output of this single chip control module; the output of this driver module is connected with the control end of this power converter main circuit; to drive this power converter main circuit; and strong and weak electricity isolates to protect this power converter main circuit; this imbalance energy regenerative conservation treatment module is connected in test side and this driver module of this power converter main circuit, absorbs the overvoltage energy on this common DC bus.
When this detection and protection module detect on this common DC bus overtension; overvoltage signal is transferred to this single chip control module; this single chip control module is transferred to this driver module with this overvoltage signal, makes this imbalance energy regenerative conservation treatment module at the overvoltage energy that absorbs under the driving of this driver module on this common DC bus.
When this imbalance energy regenerative conservation treatment module absorbed overvoltage energy on this common DC bus, this single chip control module and this detections and protection module carried out LED and indicate.
This inversion terminal control unit also comprises the running state monitoring module, and this running state monitoring module is connected in this single chip control module, and the ruuning situation of this inversion terminal control unit is carried out real time monitoring, control.
This running state monitoring module comprises LED display window, supervisory keyboard and running state monitoring lamp, monitor by operating state and the operating condition of this LED display window to this inversion terminal control unit, select and set the operational mode of this inversion terminal control unit by this supervisory keyboard, this running state monitoring lamp shows various running statuses.
This LED display window is also stored the fault message of this inversion terminal control unit.
This supervisory keyboard comprises the inversion starting terminal, stops, resetting, rotating, programming, data setting, up and down frequency adjustment and frequency modulation.
The rod-pumped well group control system based on dc bus in the utility model, compared with prior art, have the following advantages: 1. adopt and concentrate rectification, flat ripple reactance to add DC filtering, by DC bus powered, transformer capacity both had been conducive to reduce the current on line side harmonic pollution and had improved power factor, again can the decrease system cost;
On the dc bus between each Parallel Control terminal to the compensation of the energy mutual feedback of load variations, make the energy regenerative of each oil pumper be able to fully share and recycling, improve energy saving of system efficient;
3. in conjunction with the rapid Variation Features of the periodicity of oil pumper load, use the energy-saving control algolithm.By detecting present load situation and the upper and lower stroke position of oil pumper, judge through intelligent statistical analysis, realize the optimization of upper and lower stroke frequency is regulated;
4. prevent fluctuating widely and overvoltage of DC bus-bar voltage;
5. adopt the common DC bus power supply can realize the transmission of electricity of not boosting of remote " one drag many " oil well, the direct current transmission range is longer, without line loss, and has avoided stealing electric situation generation;
6. the software development of each control cubicle terminal realizes the combination of well head data acquisition and teletransmission communication and inversion control defencive function, and Highgrade integration is integrated, and is finished by a cover High Performance SCM hardware and software systematic unity, and is not only reliable and stable but also reduce cost.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment;
Fig. 2 is the structural representation of the inversion terminal control unit among Fig. 1;
Fig. 3 is the schematic diagram of the running state monitoring panel of the running state monitoring module among Fig. 2.
Embodiment
For above and other purpose of the present utility model, feature and advantage can be become apparent, cited below particularlyly go out preferred embodiment, and cooperate appended graphicly, be described in detail below.
As shown in Figure 1, Fig. 1 is the structure chart of the rod-pumped well group control system based on dc bus of the present utility model.Should be based on the rod-pumped well group control system of dc bus by comprising high-voltage switch gear 1, transformer 2, air switch 3, straightening and filtering unit 4 and inversion terminal control unit 5.Described high-voltage switch gear 1 is connected with the input of straightening and filtering unit 4 behind connection transformer 2 and the air switch 3 in turn, the output of straightening and filtering unit 4 is connected with the input of inversion terminal control unit 5, and the output of inversion terminal control unit 5 is connected with oil pumper 6.Inversion terminal control unit 5 and coupled oil pumper 6 are made as 2 covers at least, and the input of each inversion terminal control unit 5 is connected in the output of straightening and filtering unit 4 in parallel.
High-voltage switch gear 1 is rated voltage 3kV and abovely is mainly used in cut-offfing and closing the electrical equipment that closes the galvanic circle, is used for the electric power break-make between high-tension cable and the transformer 2.
Transformer 2 is that a kind of undesirable mutual electromagnetic inductance of utilizing is answered, and reduces the device of voltage, is used for high-tension electricity is reduced to 380V or mesohigh three-phase alternating-current supply.In one embodiment, the capacity aKVA that joins separate unit plain edition transformer according to former separate unit oil pumper, according to the requirement of rod-pumped well team control, select 1/5th capacity of capacity summation n*aKVA of the corresponding transformer of n platform oil pumper as the transformer capacity of team control n platform oil pumper, i.e. 0.2*n*aKVA.
Air switch 3 integrates control and multi-protective function; except finishing contact and minute deenergizing; still can be to the short circuit of circuit or electric equipment generation, seriously overload and under voltage etc. are protected, and are used for the electric power break-make between transformer 2 and the straightening and filtering unit 4.
Straightening and filtering unit 4 comprises rectifier and filter, and this rectifier is converted to this direct current energy with these three AC power, and this filter is with this direct current energy filtering.Straightening and filtering unit 4 is 5 power supplies of many mouthfuls of oil well inversion terminal control units by common DC bus, when each pumping-unit motor timesharing enters when falling the generating state, the energy that feeds back to DC side is shared by other inversion terminals on the same bus, straightening and filtering unit 4 is converted to direct current energy with AC energy, same grid side rectifier and filter are the many mouthfuls of automatically controlled terminal power supplies of oil well by common DC bus, adopt the common DC bus power supply can realize the transmission of electricity of not boosting of remote " one drag many " oil well, the direct current transmission range is longer, without line loss, and the situation of having avoided stealing electricity occurs.
As shown in Figure 2, Fig. 2 is the structure chart of a specific embodiment of the inversion terminal control unit among Fig. 1.The inversion terminal control unit mainly is that this direct current energy is converted to AC energy, and oil pumper provides this AC energy, and to ruuning situation real time monitoring, the control of this inversion terminal control unit.Inversion terminal control unit 5 comprises power converter main circuit 21, detection and protection module 22, single chip control module 23, driver module 24, uneven energy regenerative conservation treatment module 25 and running state monitoring module 26 5 parts.The input of power converter main circuit 21 is connected with the output of straightening and filtering unit 4, the output of power converter main circuit 21 is connected with oil pumper 6, be used for direct current energy is converted to AC energy, and absorbing DC side overvoltage energy, power converter main circuit 21 parts adopt the quick module compositions such as novel full control power electronic device IGBT of the 4th generation.Power converter main circuit 21 mainly is comprised of three parts: the one, and dc bus input filter capacitor and charge protection unit; the straightening and filtering unit 4 of group control system makes three-phase input current substantially not have phase place to lag behind with respect to input voltage; net side power factor is higher; for the SPWM inverter provides direct current voltage bus; this dc bus input filter capacitor is with this direct current energy filtering; impulse current when the absorption of charge protection unit has just powered on because of electric capacity; protection electric capacity and rectifier; what adopt is ambipolar SPWM control three-phase inverter bridge circuit; can greatly reduce contained Resonance Wave Composition in the output voltage; it is sinusoidal wave that output current is approached; and the power factor of input net side loop is not affected; when electric energy in time was not finished in the uneven energy regenerative conservation treatment module, this overvoltage absorption protected location absorbed the overvoltage energy on this common DC bus.The 2nd, SPWM inverter, employing be the double-pole PWM control three-phase inverter bridge circuit, can greatly reduce contained Resonance Wave Composition in the output voltage, it is sinusoidal wave that output current is approached, and on the not impact of power factor of input net side loop.The 3rd, overvoltage absorbs protected location; overtension when preventing that the dc bus energy regenerative from relatively concentrating; overvoltage absorbs protected location and realizes switch control by the high-power IGBT power model; the formation of this break-make control logic signal; comprehensively to finish with the specific control algolithm of single chip control module 23 by detecting with the logic judgement of protection module 22; Main Function is to absorb DC side overvoltage energy; prevent because the overvoltage that uneven energy regenerative causes threatens; during overvoltage absorption protected location is devoted oneself to work; single chip control module 23 and detection and protection module 22 all can provide corresponding LED indication; when uneven energy regenerative conservation treatment module can not be utilized the overvoltage energy fully; voltage raises; at this moment overvoltage absorbs protected location will conducting, absorbs overvoltage.
Detect the test side that is connected in power converter main circuit 21 with protection module 22; and the parameters such as voltage, electric current, power factor and power of pumping-unit motor are detected in real time; except the protection that realizes this device; can also finish the monitoring to the pumping-unit motor running status, occur at motor automatically sending sound and light alarm under the abnormal conditions such as overvoltage, overcurrent, overload, phase shortage.
Single chip control module 23 is connected in and detects and protection module 22; 16 dsPIC30F series DSP single-chip microcomputers and high-frequency PWM control mode have been used; finish the optimizing control algolithm of electrical machine energy-saving operation; operating state to oil pumper and drive motors is controlled automatically, so that pumping-unit motor runs on the operating state of power factor and efficient the best all the time.Single chip control module 23 is as the intelligent control core of whole system; continuously by detecting and protection module 22; the parameters such as voltage, electric current, power factor and power to pumping-unit motor detect in real time; and then the operating state of motor comprehensively judged; and by power converter main circuit 21; use unique SWM control method, realize level and smooth inverter operation and Energy Saving Control to motor.
The input of driver module 24 is connected in the output of single chip control module 23; driver module 24 output be connected with the control end of power converter main circuit 21, mainly adopt special-purpose integrated drive chips KA962 to realize the driving of high power device IGBT and strong and weak electricity isolation and protection.When the dc bus energy regenerative is concentrated, when causing busbar voltage too high, by the uneven energy regenerative conservation treatment module 25 of driver module 24 controls, the uneven regenerated energy of oil pumper is in time processed.
Uneven energy regenerative conservation treatment module 25 is connected in test side and the driver module 24 of power converter main circuit 21.The design of the uneven energy regenerative conservation treatment part of oil pumper; for the motor energy regenerative problem of generating electricity; with uneven energy regenerative conservation treatment module 25 and 21 collaborative connections of power converter main circuit; cooperate with protection module 22 by single chip control module 23, detection; finish detection feedback, the switching between uneven energy regenerative conservation treatment module 25 and the pumping-unit motor and coordinate control, and reach the tracking balance effect of power by the automatic adjusting of closed-loop system.
Running state monitoring module 26 is connected in single chip control module 23, and the ruuning situation of inversion terminal control unit 5 is carried out real time monitoring, control.Running state monitoring module 26 comprises LED display window, supervisory keyboard and running state monitoring lamp.At any time operating state and the operating condition of system are monitored by the LED display window, Guarantee control system can be processed at fault moment in time, also can in time the fault message in the system be stored simultaneously, so that the user goes to search failure cause.Can select and set two kinds of operational modes by supervisory keyboard, for example, mode 1 is common open loop converting operation; Mode 2 is the upper and lower stroke frequency automatic switchover of oil pumper operations.In one embodiment, supervisory keyboard can carry out the inversion starting terminal, stops, resetting, rotating, programming, data setting, carry out up and down frequency adjustment (namely carrying out digital addition and subtraction) and frequency modulation.The running state monitoring lamp comprises running LED, halted state indicator light, malfunction indicator light, forward indicator light and counter-rotating indicator light, to show various running statuses.As shown in Figure 3, Fig. 3 is the schematic diagram of the running state monitoring panel of running state monitoring module 26.The running state monitoring panel comprises fm dial 1, numeral+2, program key 3, numeral-4, data key 5, forward/counter-rotating 6, operation 7, stop/resetting 8, run indicator 9, stop indicator light 10, malfunction indicator lamp 11, forward indicator light 12, counter-rotating indicator light 13 and LED demonstration 14.
Inversion terminal control unit 5 is converted to AC energy with direct current energy, when powering on starting system is carried out self diagnosis, and satisfying starting conditions can starting operation.Pumping-unit motor adopts the inversion soft start runner, has not only increased starting torque but also reduced starting current, and SPWM waveform generator and corresponding control algolithm by uniqueness produce the SPWM control signal, realize inversion control.At any time according to parameters such as the voltage that the oil pumper that provides with protection module 22 is provided, electric currents; according to certain digital algorithm; calculate in real time the operate power when front motor; size according to its load factor; change the modulation rule of SPWM control switch signal, thereby realize pumping-unit motor load dynamic tracking jumpy and Energy Saving Control.At any time operating state and the operating condition of system are monitored; Guarantee control system can be processed at fault moment in time; also can in time the fault message in the system be stored simultaneously; so that the user goes to search failure cause; according to the detection of falling the generating state information that provides with protection module 22 is provided; making logic analysis judges; on the one hand with the automatic feed-in dc bus of the uneven energy regenerative of oil pumper; for many oil well terminals are shared; on the other hand; when the dc bus energy regenerative is concentrated; when causing busbar voltage too high; by the uneven energy regenerative conservation treatment module 25 of driver module 24 controls, the uneven regenerated energy of oil pumper is in time processed.

Claims (10)

1. based on the rod-pumped well group control system of dc bus, it is characterized in that, should comprise transformer based on the rod-pumped well group control system of dc bus, straightening and filtering unit and a plurality of inversion terminal control unit, this transformer is reduced to 380V or mesohigh three-phase alternating-current supply with high-tension electricity, this straightening and filtering unit is converted to direct current energy with these three AC power, a plurality of inputs of these a plurality of inversion terminal control units are connected in the output of this straightening and filtering unit in parallel by common DC bus, a plurality of outputs connect respectively a plurality of oil pumpers, these a plurality of inversion terminal control units are converted to AC energy with this direct current energy, for these a plurality of oil pumpers provide this AC energy, and to the ruuning situation real time monitoring of this inversion terminal control unit, control.
2. the rod-pumped well group control system based on dc bus according to claim 1, it is characterized in that, should also comprise high-voltage switch gear based on the rod-pumped well group control system of dc bus, this high-voltage switch gear is connected in this transformer, the electric power break-make between control high-tension cable and this transformer.
3. the rod-pumped well group control system based on dc bus according to claim 1, it is characterized in that, should also comprise air switch based on the rod-pumped well group control system of dc bus, this air switch connects the input of this transformer and this straightening and filtering unit, controls the electric power break-make between this transformer and this straightening and filtering unit.
4. the rod-pumped well group control system based on dc bus according to claim 1, it is characterized in that, this straightening and filtering unit comprises rectifier and filter, and this rectifier is converted to this direct current energy with these three AC power, and this filter is with this direct current energy filtering.
5. the rod-pumped well group control system based on dc bus according to claim 1; it is characterized in that; this inversion terminal control unit comprises the power converter main circuit; detection and protection module and single chip control module; the input of this power converter main circuit is connected with the output of this straightening and filtering unit; output is connected with this pumping-unit motor; it is converted to this AC energy with this direct current energy; for this pumping-unit motor provides this AC energy; and absorb overvoltage energy on this common DC bus; this detection and protection module are connected in the test side of this power converter main circuit; its parameter to the motor of this oil pumper detects in real time; and detection signal is transferred to this single chip control module; this single chip control module receives this detection signal; and judge the operating state of this motor, this AC energy that provides to control this power converter main circuit according to this detection signal.
6. the rod-pumped well group control system based on dc bus according to claim 5; it is characterized in that; this power converter main circuit comprises that dc bus input filter capacitor, charge protection unit, SPWM inverter and overvoltage absorb protected location; this dc bus input filter capacitor is with this direct current energy filtering; impulse current when this charge protection unit absorption has just powered on because of this dc bus input filter capacitor; this SPWM inverter is converted to this AC energy with this direct current energy, and this overvoltage absorption protected location absorbs the overvoltage energy on this common DC bus.
7. the rod-pumped well group control system based on dc bus according to claim 5 is characterized in that, this detection and protection module sound and light alarm occurs automatically sending under the abnormal conditions at this motor.
8. the rod-pumped well group control system based on dc bus according to claim 5 is characterized in that, this single chip control module is used 16 dsPIC30F series DSP single-chip microcomputers and high-frequency PWM control mode.
9. the rod-pumped well group control system based on dc bus according to claim 5; it is characterized in that; this inversion terminal control unit also comprises driver module and uneven energy regenerative conservation treatment module; the input of this driver module is connected in the output of this single chip control module; the output of this driver module is connected with the control end of this power converter main circuit; to drive this power converter main circuit; and strong and weak electricity isolates to protect this power converter main circuit; this imbalance energy regenerative conservation treatment module is connected in test side and this driver module of this power converter main circuit, absorbs the overvoltage energy on this common DC bus.
10. the rod-pumped well group control system based on dc bus according to claim 9; it is characterized in that; when this detection and protection module detect on this common DC bus overtension; overvoltage signal is transferred to this single chip control module; this single chip control module is transferred to this driver module with this overvoltage signal, makes this imbalance energy regenerative conservation treatment module at the overvoltage energy that absorbs under the driving of this driver module on this common DC bus.
CN2012202225025U 2012-05-17 2012-05-17 A pumping unit well group control system based on a DC bus Active CN202679286U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107370134A (en) * 2017-05-03 2017-11-21 昆明理工大学 A kind of method for reducing extra high voltage direct current transmission line DC filter overvoltage
CN108649552A (en) * 2018-05-21 2018-10-12 中石化石油机械股份有限公司研究院 Large-scale petroleum based on DC bus equips group control system
CN109488581A (en) * 2018-09-12 2019-03-19 中国石油天然气股份有限公司 The mutual balanced linear drive pumping unit control system of one machine twin-well and oil rig

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107370134A (en) * 2017-05-03 2017-11-21 昆明理工大学 A kind of method for reducing extra high voltage direct current transmission line DC filter overvoltage
CN107370134B (en) * 2017-05-03 2019-02-19 昆明理工大学 A method of for reducing extra high voltage direct current transmission line DC filter overvoltage
CN108649552A (en) * 2018-05-21 2018-10-12 中石化石油机械股份有限公司研究院 Large-scale petroleum based on DC bus equips group control system
CN109488581A (en) * 2018-09-12 2019-03-19 中国石油天然气股份有限公司 The mutual balanced linear drive pumping unit control system of one machine twin-well and oil rig

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