CN105720795A - Wind power conversion control system - Google Patents
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- CN105720795A CN105720795A CN201410721374.2A CN201410721374A CN105720795A CN 105720795 A CN105720795 A CN 105720795A CN 201410721374 A CN201410721374 A CN 201410721374A CN 105720795 A CN105720795 A CN 105720795A
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Abstract
The invention provides a wind power conversion control system which comprises a motherboard, a master control board fixed on a pin socket on the front of the motherboard through a pin, and multiple plug-in boards which are fixed on a pin socket on the back of the motherboard through pins. With the wind power conversion control system, the technical problem that centralized wind power conversion control cannot be achieved in the prior art is solved, the utilization rate of each plug-in board circuit can be ensured to the maximum through the modular design, the flexibility and security of hardware configuration are greatly improved, the layout difficulty of a complex PCB is reduced, and the cycle of product secondary development is shortened.
Description
Technical field
The present invention relates to technical field of circuit control, particularly to a kind of wind-powered electricity generation Variable flow control system.
Background technology
At present, the generating of new forms of energy is realized with the grid-connected control mainly through current transformer, the direction that generation of electricity by new energy technology is simplified to mechanical part gradually and power electronics control parts complicate is developed, thus capacity and reliability to current transformer are had higher requirement, and the converter topologies such as AC-DC-AC have also been obtained in current transformer field and is widely applied.
But, how wind-powered electricity generation unsteady flow is carried out centralized control, not yet propose effective solution at present.
Summary of the invention
Embodiments providing a kind of wind-powered electricity generation Variable flow control system, to solve cannot wind-powered electricity generation unsteady flow be carried out in prior art the technical problem of centralized control, this control system includes:
Motherboard；
Master control borad, is fixed on the pin jack in described motherboard front by pin contact pin；
Multiple cards, are fixed on the pin jack of described motherboard reverse side by pin contact pin.
In one embodiment, described master control borad includes: one piece of dsp board and one block of FPGA plate, and described master control borad is fixed on two 96 pin jacks in described motherboard front by two 96 pin contact pins pluggablely.
In one embodiment, described 96 pins be distributed as 3 row, 32 pin contact pins of each column, described 96 pin jacks be distributed as 3 row, 32 pin jacks of each column.
In one embodiment, the dsp chip model in described master control borad is TMS320F2812, and fpga chip model is EP4CE115F23C8.
In one embodiment, being sized to of described card: 220mm × 145mm.
In one embodiment, the quantity of described card is 11 pieces, respectively through 96 pin contact pin pluggable be fixed on 96 pin jacks of described motherboard reverse side.
In one embodiment, described card includes at least one of: power panel, signal regulating panel, digital IO plate, pulse signal tablet, PWM plate and protection board.
In one embodiment, described power panel is for powering for other card；
Described signal regulating panel Zhong Mei road signal conditioning circuit includes: voltage follower circuit, amplifying circuit, biasing circuit and the RC filter circuit being sequentially connected, and the analogue signal come for sensor transmissions is adjusted to the applicable AD signal sampled；
Digital input circuit in described digital IO plate includes: TLP121 optical coupling isolation circuit, RC filter circuit and the SN74CBTD3384DW electrical level transferring chip being sequentially connected, and the digital output circuit in described digital IO plate includes: the 74LS244 chip being sequentially connected and TLP127 optical coupling isolation circuit；
Described pulse signal tablet includes: TLP559 optical coupling isolation circuit, RC wave filter and the 74HC14N electrical level transferring chip being sequentially connected, for identifying the level saltus step of input pulse signal；
Every block of described PWM plate includes No. 7 output circuits and No. 2 input circuits, wherein, having 6 tunnel output PWM waveform in described No. 7 output circuits, 1 tunnel adopts HFBR-1522 fiber optic transmitter output fault locking signal, and described No. 2 input circuits adopt HFBR-2522 fiber optic receiver input external fault signal；
Described protection board includes 4 amount of passing by protection circuit and 1 tunnel phase frequency measuring circuits; wherein; described excessive protection circuit is for comparing rear output logic signal by input electric parameters and threshold value; light-coupled isolation is carried out again through 6n137 chip; described phase frequency measuring circuit for being converted to square-wave signal by the AC signal of input, and to 6n137 optical coupling isolation circuit, the output of described square-wave signal is carried out light-coupled isolation.
In one embodiment, described power panel includes: one piece of AC/DC circuit board and one piece of DC/DC circuit board, wherein, described AC/DC circuit board is for being converted to unidirectional current by alternating current, input is to described DC/DC circuit board, and described unidirectional current is converted to the voltage needed for other card by described DC/DC circuit board.
In one embodiment, the number of described signal regulating panel is 2n block, and every block of conditioned signal plate includes 8 tunnel conditioned signal, and wherein, n is the integer be more than or equal to 2.
In embodiments of the present invention, provide a kind of wind-powered electricity generation Variable flow control system, it is provided with motherboard, master control borad and card, master control borad and card all pass through pin insert motherboard socket in define a complete modular control system, thus can not only realize grid-connected wind power unit, the control of energy storage and Switching Power Supply current transformer, solve the technical problem that wind-powered electricity generation unsteady flow cannot be carried out centralized control in prior art, modular design can also farthest ensure the utilization rate of each card circuit, substantially increase motility and the safety of hardware configuration, the problem reducing the layout difficulty of complex PCB, shorten the cycle of product secondary development.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, is not intended that limitation of the invention.In the accompanying drawings:
Fig. 1 is the composition structural representation of the wind-powered electricity generation Variable flow control system of the embodiment of the present invention.
Fig. 2 is the motherboard front interface schema of the embodiment of the present invention.
Fig. 3 is the motherboard rear interface figure of the embodiment of the present invention.
Fig. 4 is the card specification figure of the embodiment of the present invention.
Fig. 5 is the signal schematic representation of the power panel A of the embodiment of the present invention.
Fig. 6 is the signal schematic representation of the power panel B of the embodiment of the present invention.
Fig. 7 is the signal schematic representation of the signal regulating panel of the embodiment of the present invention.
Fig. 8 is the signal schematic representation of the digital IO plate of the embodiment of the present invention.
Fig. 9 is the signal schematic representation of the pulse signal tablet of the embodiment of the present invention.
Figure 10 is the signal schematic representation of the PWM plate of the embodiment of the present invention.
Figure 11 is the signal schematic representation of the protection board of the embodiment of the present invention.
Figure 12 is the overall signal schematic diagram of the embodiment of the present invention.
Figure 13 is the schematic diagram controlled for double-fed wind power generator of the embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment and accompanying drawing, the present invention is described in further details.At this, the exemplary embodiment of the present invention and explanation thereof are used for explaining the present invention, but not as a limitation of the invention.
In this example, it is provided that a kind of wind-powered electricity generation Variable flow control system, as it is shown in figure 1, specifically include that
Motherboard 101；
Master control borad 102, is fixed on the pin jack in described motherboard front by pin contact pin；
Multiple cards 103, are fixed on the pin jack of described motherboard reverse side by pin contact pin.
Namely, provide a kind of converter control system based on modularized design, so that complexity electric quantity signal process circuit is carried out modularity and General design, by each modular PCB card of the individually designed one-tenth of electric quantity signal processing procedure, thus improving the versatility of the simplicity of circuit design, the motility of configuration and use.
As shown in Figure 1, master control borad adopts the design of " DSP+FPGA ", DSP is communicated as primary processor and with upper PC, the peripheral circuit of master control borad, as coprocessor, is called card, in this converter control system by FPGA, 11 cards can be set, for the ease of the measurement of signal, being measure plate by the circuit design being made up of sensor, the number measuring plate specifically can by how many decisions of signal.
In this example, according to the integrated circuit structure of converter control system and the function processing signal, whole hardware platform has been carried out region division, mainly included above-mentioned master control borad, motherboard and multiple card.
Wherein, master control borad is the double-core master control borad with DSP and fpga chip, dsp chip model can be chosen to be TMS320F2812, the model of fpga chip can be chosen to be EP4CE115F23C8, master control borad can be fixed on motherboard front by two 96 pin contact pins, wherein, 96 pins are distributed as 3 row, each column 32 pin.Motherboard specification is: 83 Δs × 140mm (1 △=5.08mm), there are two 96 pin jacks in front, it is backed with 11 96 pin jacks, motherboard is while the carrier as fixing master control borad and card, also serve as the medium of signal converting, as it is shown in figure 1, each signal inputs from card, calculate through master control borad and process, then export the external circuits such as current transformer from card.But, it should be noted that, chip model involved by this example, the number of card, pin number etc., it is provided to the present invention is better described, it is not intended that inappropriate limitation of the present invention, the chip of other model or the card of other quantity, the pin of other quantity can also be adopted.Being the front interface schema of motherboard as shown in Figure 2, have two 96 pin jacks, master control borad is fixed on motherboard by the two socket.It is the rear interface figure of motherboard as shown in Figure 3, has 11 96 pin jacks, the fixed position of corresponding 11 cards.
In this example, control system can arrange 11 pieces of cards, as shown in Figure 4, each card specification can set that as 220mm × 145mm, the back side of motherboard it is inserted in respectively through single 96 pin contact pins, wherein, these 11 pieces of cards can be divided into three big classes: power supply class, analogue signal class and digital signal class.Below this three major types is specifically described:
1) card of power supply class
As it is shown in figure 1, the card of power supply class has: power panel A and power panel B.Further, it is contemplated that the size of board mounted power module and the difference of electric pressure, in this example, the card of power supply class is divided into: AC/DC circuit board (power panel A) and DC/DC circuit board (power panel B), wherein:
1-1) power panel A card can adopt the AC/DC switch power module of Width funtion input (18V～36V) Weidmulie Wei 100W, selects exchange EMC wave filter to filter harmonic wave, and 220V alternating current converts to 24V unidirectional current, power supply source plate B conversion；
Concrete, it is the signal schematic representation of power panel A as shown in Figure 5, input is 220V electric main, first pass through EMC wave filter and filter harmonic wave, then through Weidmulie AC/DC Switching Power Supply Wei of wide input, 220V alternating current is become 24V unidirectional current, export to power panel B after RC filter circuit after.
1-2) power panel B card can use the golden yang invigorating 20W switch power module that Width funtion inputs, the 24V unidirectional current that power panel A changes is converted to three road voltages: 5V digital power, ± 15V analog power, 24V Switching Power Supply, power for other card, it is possible to select magnetic bead to filter High-frequency Interference as DC filter.
Concrete, it is the signal schematic representation of power panel B as shown in Figure 6, its input is the 24V unidirectional current of power panel A output, respectively enter after EMC filter filtering four have a lot of social connections input golden yang invigorating switch power module, output 5V digital power respectively, + 15V analog power ,-15V analog power and 24V Switching Power Supply, respectively each card is powered.
2) card of analogue signal class
As shown in Figure 1, the card of analogue signal class can have: signal regulating panel A, signal regulating panel B, signal regulating panel C and signal regulating panel D, and the design of this four block signals conditioning plate is all the same, time actually used, the number of signal regulating panel can also is that 6 pieces, 8 pieces etc., as long as the even number be more than or equal to 4 is just passable.
The analogue signal that the card of analogue signal class is mainly used in sensor transmissions being come is adjusted to the signal of applicable AD sampling, is therefore referred to as: signal regulating panel.Wherein, every block signal conditioning plate all has 8 road signal conditioning circuits, it is contemplated that control systematic sampling passage in this example at maximum up to 32 tunnels, it is therefore desirable to 4 block signal conditioning plates.Every road signal conditioning circuit is made up of voltage follower circuit, amplifying circuit and biasing circuit, uses RC circuit to be filtered.
Being the signal schematic representation of signal regulating panel as shown in Figure 7, every block signal conditioning plate all has 8 road signal conditioning circuits.Electric current that current sensor records and the voltage that voltage sensor records input as signal, first pass around RC circuit and filter harmonic wave, the conditioning of signal is carried out, finally then through inputing to control system after RC filter circuit to carry out AD sampling then through voltage follower circuit, amplifying circuit and biasing circuit.
3) card of digital signal class
As it is shown in figure 1, the card of digital signal class can have: digital IO plate, pulse signal tablet, PWM plate A, PWM plate B and protection board, wherein:
3-1) digital IO plate, is the digital signal input/output port of switch board, mainly gathers the switching value of external relay folding the controlled quentity controlled variable of output control switch folding, in the control for the grid-connected switch of blower fan.In this example, digital IO plate can be divided into: digital input circuit and output circuit two parts, wherein, digital input circuit always has 8 tunnels, and every road adopts TLP121 to carry out light-coupled isolation in input port, and signal is sent into after filtering then through RC SN74CBTD3384DW electrical level transferring chip, signal sends into described control system the most at last, digital output circuit always has 8 tunnels, and every road output signal is introduced into 74LS244 chip, again through output after TLP127 light-coupled isolation to peripheral circuit.Further, digital IO plate is also used as the external expanding plate of PWM, when switch board PWM way is more than 12 tunnel, it is possible to use digital IO plate additionally increases by 8 tunnels.
It is the signal schematic representation of digital IO plate as shown in Figure 8, its stimulus part has 8 road signal input circuits, through RC circuit filtering after digital signal input, then pass through after light-coupled isolation then through RC filter circuit, eventually pass after SN74CBTD3384DW electrical level transferring chip processes and input to control system.Segment signal output also has No. 8 output circuits, its signal processing and input process contrary, and the signal that control system will export first passes through 74LS244N chip and processes, then in turn through output after RC filtering, light-coupled isolation and RC filtering.
3-2) pulse signal tablet, being a kind of quickly digital IO plate, it can quickly identify the level saltus step of input pulse signal, inputs to control system and catches, it is generally used for the input of motor photoelectric code disk signal, it is possible to calculate rotor speed and the rotor-position of motor.Wherein, pulse signal tablet always has 8 input ports, tunnel, input port, every road all adopts RC filtering and TLP559 light-coupled isolation, 1st road and the 2nd road are standby each other, 3rd road and the 4th road are standby each other, and the 5th road and the 6th road are standby each other, select standby Zhong mono-tunnel each other through wire jumper, 7th, 8 tunnels are without wire jumper, namely control the most multipotency of system and receive 5 road pulse signals simultaneously.Pulse signal after light-coupled isolation enters metering-in control system after electrical level transferring chip 74HC14N processes.
Being the signal schematic representation of pulse signal tablet as shown in Figure 9, wherein, EXA and/EXA is a pair complementary signal, selects through wire jumper, and equally, EXB and/EXB is a pair complementary signal, and EXZ and/EXZ is a pair complementary signal.Every road input circuit is all the same, and after input signal passes sequentially through RC filtering, light-coupled isolation and RC filtering, input 74HC14N chip processes, and recently enters control system.
3-3) PWM plate, as shown in Figure 1, including: PWM plate A and PWM plate B, both designs are identical, and Main Function is to drive power model as output PWM ripple, every piece of PWM card has No. 7 output circuits and No. 2 input circuits, wherein, having 6 tunnels in No. 7 output circuits is output PWM waveform, 1 tunnel output fault locking signal, fiber optic transmitter HFBR-1522 is used to convert the electrical signal to optical signal, it is possible to reduce the crosstalk between primary system and secondary control system.No. 2 input circuit inputs are external fault signals, for the block to PWM output module, use fiber optic receiver HFBR-2522.
It is the signal schematic representation of PWM plate as shown in Figure 10, every block of PWM plate has 6 road PWM output circuits, all pwm signals that control system will export first input to 74LS14N chip, 6 road circuit are flowed to respectively again by 74LS14N chip, every road circuit signal is all first pass through light-coupled isolation, input optical fibre emitting head again, converts the electrical signal to optical signal and exports to current transformer.
3-4) protection board; for the overvoltage of whole control system, excessively stream are protected; circuit and 1 tunnel phase frequency measuring circuit is protected including 4 amounts of passing by; wherein; input electric parameters and threshold value are compared rear output logic signal by excessive protection circuit, carry out input control system after light-coupled isolation again through 6n137 chip, and input exchange signal is become square-wave signal by phase frequency measuring circuit; then through input control system after 6n137 light-coupled isolation, for the frequency controlling system-computed input exchange signal.
It is the signal schematic representation of protection board as shown in figure 11; protection board has 4 amount of passing by protection circuit and 1 tunnel phase frequency measuring circuits; wherein; often the signal of the amount of passing by protection circuit input is three-phase voltage or three-phase current; producing excessive protection signal after excessive protection module, excessive protection signal inputs to control system after light-coupled isolation.The input signal of phase frequency measuring circuit is three phase sine voltage, and after phase frequency measurement module, three tunnel sinusoidal signals are treated to three road pulse signals, and every road pulse signal carries out catching and calculating each through inputing to control system after light-coupled isolation.
It is the schematic diagram of the whole signal processing of wind-powered electricity generation Variable flow control system as shown in figure 12, illustrates controlling DFIG wind-driven generator as shown in fig. 13 that for the wind-powered electricity generation Variable flow control system shown in Figure 12 below, including:
1) first DSP sends AD and samples instruction ADSTART to FPGA, FPGA sends instructions to off-chip sampling A/D chip AD7606, then voltage sensor LV25-P and current sensor LA100-P harvester side converter voltage x current value respectively, net survey current transformer voltage x current value and d-c bus voltage value, it is sent on master control borad after signal regulating panel to be AD converted in off-chip sampling A/D chip AD7606, finally the sampled value converted is sent in FPGA, sampled value is sent in DSP by FPGA again, thus completing AD sampling.
2) for the frequency measurement of the rotating speed of DFIG rotor, position measurement and line voltage, it is possible to use frequency measurement module completes.Rotor is provided with photoelectric code disk, when rotor rotates, produces square-wave signal, warp after pulse signal tablet collection sent into DSP by FPGA, utilize DSP to catch circuit and carry out catching of signal, and calculated rotating speed and the position of rotor by program.When measuring the frequency of line voltage, first sinusoidal signal is changed into square-wave signal through the phase frequency measuring circuit of protection board by voltage, sends into FPGA after being gathered by pulse signal tablet equally, be re-fed into DSP and carry out processing and calculating frequency.
3) after DSP obtains AD sampled value, feeding control program processes, first sampled value is carried out coordinate transform to realize decoupling by control program, re-use PI program and carry out closed loop adjustment to generate command voltage value, finally use the time manager EV of space vector pulse width modulation SVPWM and DSP to generate corresponding PWM ripple.The PWM ripple generated, via PWM plate A and PWM plate B conversion process, drives net to survey current transformer and pusher side current transformer, it is achieved the control of DFIG wind-driven generator respectively after converting electrical signals into optical signal.
4) the input signal controlling system protection plate is that net surveys current transformer and the voltage of pusher side current transformer, electric current and DC bus-bar voltage, determines whether overvoltage occurs or crosses the failure condition of stream via the protection circuit on protection board.If it occur that fault, then protection board sends fault locking signal to PWM plate to block the output of PWM, is simultaneously emitted by fault locking signal to the time manager of DSP to turn off the generation of PWM.If using this switch board to control single-stage current transformer, then having only to use one block of PWM plate, AD sampling way also reduces accordingly simultaneously, for the card without using, it is possible to directly extract from switch board, do not affect the operation of whole control system, convenient, flexible.
In the above-described embodiments; the way of the PWM of this wind-powered electricity generation Variable flow control system output is not by the restriction of the fixed resource of DSP; can be extended by FPGA; and in signals collecting, protection, process etc., improve compatible, motility and versatility as far as possible; this platform is except being applied to the experiment of wind-powered electricity generation unsteady flow, it may also be used for the power converter control fields such as generation of electricity by new energy, energy storage, Switching Power Supply.Additionally, due to each functional circuit is individually designed, it is possible to achieve flexible configuration and combination, it is also possible in being connected to form numerical model analysis analogue system with RTDS.
In from the description above, can be seen that, the embodiment of the present invention achieves following technique effect: provide a kind of wind-powered electricity generation Variable flow control system, it is provided with motherboard, master control borad and card, master control borad and card all pass through pin insert motherboard socket in define a complete modular control system, thus can not only realize grid-connected wind power unit, the control of energy storage and Switching Power Supply current transformer, solve the technical problem that wind-powered electricity generation unsteady flow cannot be carried out centralized control in prior art, modular design can also farthest ensure the utilization rate of each card circuit, substantially increase motility and the safety of hardware configuration, the problem reducing the layout difficulty of complex PCB, shorten the cycle of product secondary development.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the embodiment of the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. a wind-powered electricity generation Variable flow control system, it is characterised in that including:
Motherboard；
Master control borad, is fixed on the pin jack in described motherboard front by pin contact pin；
Multiple cards, are fixed on the pin jack of described motherboard reverse side by pin contact pin.
2. wind-powered electricity generation Variable flow control system as claimed in claim 1, it is characterised in that described master control borad comprises one piece of dsp chip and one piece of fpga chip, and described master control borad is fixed on two 96 pin jacks in described motherboard front by two 96 pin contact pins pluggablely.
3. wind-powered electricity generation Variable flow control system as claimed in claim 2, it is characterised in that described 96 pins be distributed as 3 row, 32 pin contact pins of each column, described 96 pin jacks be distributed as 3 row, 32 pin jacks of each column.
4. wind-powered electricity generation Variable flow control system as claimed in claim 2, it is characterised in that the dsp chip model in described master control borad is TMS320F2812, and fpga chip model is EP4CE115F23C8.
5. the wind-powered electricity generation Variable flow control system as according to any one of Claims 1-4, it is characterised in that being sized to of described card: 220mm × 145mm.
6. the wind-powered electricity generation Variable flow control system as according to any one of Claims 1-4, it is characterised in that the quantity of described card is 11 pieces, respectively through 96 pin contact pin pluggable be fixed on 96 pin jacks of described motherboard reverse side.
7. the wind-powered electricity generation Variable flow control system as according to any one of Claims 1-4, it is characterised in that described card includes at least one of: power panel, signal regulating panel, digital IO plate, pulse signal tablet, PWM plate and protection board.
8. wind-powered electricity generation Variable flow control system as claimed in claim 7, it is characterised in that:
Described power panel is for powering for other card；
Described signal regulating panel Zhong Mei road signal conditioning circuit includes: voltage follower circuit, amplifying circuit, biasing circuit and the RC filter circuit being sequentially connected, and the analogue signal come for sensor transmissions is adjusted to the applicable AD signal sampled；
Digital input circuit in described digital IO plate includes: TLP121 optical coupling isolation circuit, RC filter circuit and the SN74CBTD3384DW electrical level transferring chip being sequentially connected, and the digital output circuit in described digital IO plate includes: the 74LS244 chip being sequentially connected and TLP127 optical coupling isolation circuit；
Described pulse signal tablet includes: TLP559 optical coupling isolation circuit, RC wave filter and the 74HC14N electrical level transferring chip being sequentially connected, for identifying the level saltus step of input pulse signal；
Every block of described PWM plate includes No. 7 output circuits and No. 2 input circuits, wherein, having 6 tunnel output PWM waveform in described No. 7 output circuits, 1 tunnel adopts HFBR-1522 fiber optic transmitter output fault locking signal, and described No. 2 input circuits adopt HFBR-2522 fiber optic receiver input external fault signal；
Described protection board includes 4 amount of passing by protection circuit and 1 tunnel phase frequency measuring circuits; wherein; described excessive protection circuit is for comparing rear output logic signal by input electric parameters and threshold value; light-coupled isolation is carried out again through 6n137 chip; described phase frequency measuring circuit for being converted to square-wave signal by the AC signal of input, and to 6n137 optical coupling isolation circuit, the output of described square-wave signal is carried out light-coupled isolation.
9. wind-powered electricity generation Variable flow control system as claimed in claim 7, it is characterized in that, described power panel includes: one piece of AC/DC circuit board and one piece of DC/DC circuit board, wherein, described AC/DC circuit board is for being converted to unidirectional current by alternating current, input is to described DC/DC circuit board, and described unidirectional current is converted to the voltage needed for other card by described DC/DC circuit board.
10. wind-powered electricity generation Variable flow control system as claimed in claim 7, it is characterised in that the number of described signal regulating panel is 2n block, and every block of conditioned signal plate includes 8 tunnel conditioned signal, and wherein, n is the integer be more than or equal to 2.
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| CN201410721374.2A CN105720795A (en) | 2014-12-02 | 2014-12-02 | Wind power conversion control system |
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| CN201410721374.2A CN105720795A (en) | 2014-12-02 | 2014-12-02 | Wind power conversion control system |
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| CN107393257A (en) * | 2017-08-23 | 2017-11-24 | 江苏舾普泰克自动化科技有限公司 | A kind of personal security warning device and its application process |
| CN107390141A (en) * | 2017-09-07 | 2017-11-24 | 国网辽宁省电力有限公司 | A kind of current transformer detection means and method suitable for distributed generator islanding detection |
| CN108123589A (en) * | 2016-11-28 | 2018-06-05 | 南京科技职业学院 | Wind power converter control system based on PCC |
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