CN207442459U - A kind of wind power generation high voltage direct current transportation device - Google Patents
A kind of wind power generation high voltage direct current transportation device Download PDFInfo
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- CN207442459U CN207442459U CN201721610618.5U CN201721610618U CN207442459U CN 207442459 U CN207442459 U CN 207442459U CN 201721610618 U CN201721610618 U CN 201721610618U CN 207442459 U CN207442459 U CN 207442459U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The utility model discloses a kind of wind power generation high voltage direct current transportation devices, the utility model, which is included in each motor side converter, all increases a charge-discharge controller and energy storage device, when the alternating current that wind-driven generator generates is converted to direct current electricity output by motor side AC/DC current transformers, judge whether the voltage of motor side AC/DC current transformers output is more than predetermined voltage threshold, if the voltage of motor side AC/DC current transformers output is more than predetermined voltage threshold, then charge-discharge controller control energy storage device charges, make the reduction of high voltage dc bus voltage, if the voltage of motor side AC/DC current transformers output is less than predetermined voltage threshold, then charge-discharge controller control energy storage device electric discharge, so that high voltage dc bus voltage raises.In this way, it can be when the direct current energy of each motor side AC/DC current transformers exports and there is fluctuation, the voltage of high voltage dc bus is maintained into a fixed value as far as possible, improves the stability of high voltage dc bus voltage, reduces the loss generated during electric energy transmission.
Description
Technical field
The utility model is related to technical field of wind power generation, are filled more particularly to a kind of wind power generation high voltage direct current transportation
It puts.
Background technology
Offshore wind farm has many advantages, such as that wind speed is high, turbulence intensity is small, wind speed and direction is stablized, and is the main of wind-powered electricity generation industry development
Trend.With marine wind electric field capacity, the increase of offshore distance, realize that the grid-connected of marine wind electric field will using D.C. high voltage transmission
As inexorable trend.
The transmission tariff of the prior art is the marine wind electric field D.C. high voltage transmission scheme based on the series connection of motor side converter,
As shown in Figure 1, Fig. 1 is a kind of structure diagram for wind power generation high voltage direct current transportation scheme that the prior art provides, Suo Youfeng
The motor side converter of motor group is connected in DC terminal, and the DC terminal electric current of all current transformers is equal.It is defeated when Wind turbines
When entering fluctuations in wind speed, the DC terminal voltage for being fully embodied as motor side converter is fluctuated in the fluctuation of output power.High straightening
The voltage for flowing busbar is equal to the sum of DC terminal voltage of all motor side converters, therefore the voltage fluctuation of high voltage dc bus is
The superposition of the DC terminal voltage fluctuation of all motor side converters.Therefore, when wind farm wind velocity slightly fluctuates, high voltage direct current is female
Fluctuation is caused electric energy transmission consumption increase by the voltage of line, and when the voltage of high voltage dc bus is less than AC network
During line voltage spoke value, main grid side inverter will be unable to work normally.
Therefore, how to provide a kind of high-voltage dc transmission electric installation for the voltage stability for improving high voltage dc bus is ability
The current problem to be solved of field technique personnel.
Utility model content
The purpose of this utility model is to provide a kind of wind power generation high voltage direct current transportation device, by high voltage dc bus
Voltage maintains a fixed value as far as possible, improves the stability of high voltage dc bus voltage, is produced when reducing electric energy transmission
Raw loss.
In order to solve the above technical problems, the utility model provides a kind of wind power generation high voltage direct current transportation device, including：
Several wind-driven generators, the output terminal of each wind-driven generator connect a motor side AC/DC and become respectively
Flow the input terminal of device；
Multiple motor side AC/DC current transformers, the output terminal series connection of each motor side AC/DC current transformers, and go here and there
Connection circuit first end and second end pass through corresponding HVDC transmission line and grid side DC/AC inverter input terminals respectively
Connection；The output terminal of the motor side AC/DC current transformers and the input terminal of charge-discharge controller connect；The motor side AC/
The first capacitance is parallel between the positive-negative output end of DC current transformers；
The charge-discharge controller, the charge-discharge controller cathode output end are connected with energy storage device anode, institute
Charge-discharge controller cathode output end is stated to be connected with the energy storage device cathode；The charge-discharge controller is for selectivity
Ground controls first capacitance to charge or control the energy storage device to discharge to first capacitance to the energy storage device；
Each motor side AC/DC current transformers, each charge-discharge controller and the grid side DC/AC are inverse
The control terminal for becoming device connects a local control respectively, and the local control is used to generate described in pulse drive signal control
The output of motor side AC/DC current transformers, the charge-discharge controller and the grid side DC/AC inverters；
Central controller, the input terminal of the central controller are connected with the output terminal of each local control, institute
The output terminal for stating central controller is connected with the local control input terminal of the grid side DC/AC inverters, for calculating
The active power set-point of grid side DC/AC inverters described in the following n period is simultaneously sent to the grid side DC/AC inverters
Local control controlled；
The grid side DC/AC inverters, the grid side DC/AC inverter output ends are connected with AC network；It is described
The second capacitance is parallel between grid side DC/AC inverter positive-negative input ends.
Preferably, the charge-discharge controller is two-way DC/DC charging-discharging controllers.
Preferably, voltage check device, the voltage check device input terminal and the motor side AC/DC unsteady flows are further included
Device output terminal connects, and the input terminal of the voltage check device output terminal and the local control of the charge-discharge controller connects
It connects.
Preferably, electric quantity detection apparatus is further included, the input terminal of the electric quantity detection apparatus is connected with the energy storage device,
The output terminal of the electric quantity detection apparatus is connected with the central controller.
Preferably, the voltage check device is voltmeter.
Preferably, the voltage check device is voltage transformer.
A kind of wind power generation high voltage direct current transportation device provided by the utility model, all increases in each motor side converter
One charge-discharge controller and energy storage device, when the alternating current that wind-driven generator generates is turned by motor side AC/DC current transformers
When being changed to direct current electricity output, judge whether the voltage of motor side AC/DC current transformers output is more than predetermined voltage threshold, if motor side
The voltage of AC/DC current transformers output is more than predetermined voltage threshold, then charge-discharge controller control energy storage device charges, and makes high pressure
DC bus-bar voltage reduces, if the voltage of motor side AC/DC current transformers output is less than predetermined voltage threshold, charge and discharge control dress
Put control energy storage device electric discharge so that high voltage dc bus voltage raises.It in this way, can be in each motor side AC/
When the direct current energy output of DC current transformers has fluctuation, the voltage of high voltage dc bus is maintained into a fixed value as far as possible,
The stability of high voltage dc bus voltage is improved, reduces the loss generated during electric energy transmission.
Description of the drawings
It, below will be to the prior art and embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments, for those of ordinary skill in the art, without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is a kind of structure diagram for wind power generation high voltage direct current transportation scheme that the prior art provides；
Fig. 2 is a kind of structure diagram of wind power generation high voltage direct current transportation device provided by the utility model；
Fig. 3 is a kind of control method block diagram of motor side AC/DC current transformers provided by the utility model.
Specific embodiment
The core of the utility model is to provide a kind of wind power generation high voltage direct current transportation device, by high voltage dc bus
Voltage maintains a fixed value as far as possible, improves the stability of high voltage dc bus voltage, is produced when reducing electric energy transmission
Raw loss.
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, those of ordinary skill in the art's all other embodiments obtained without making creative work, belongs to
The scope of the utility model protection.
The utility model provides a kind of wind power generation high voltage direct current transportation device, as shown in Fig. 2, Fig. 2 is new for this practicality
A kind of structure diagram for wind power generation high voltage direct current transportation device that type provides, the device include：
Several wind-driven generators 1, the output terminal of each wind-driven generator 1 connect a motor side AC/DC unsteady flow respectively
The input terminal of device 2；
Multiple motor side AC/DC current transformers 2, the output terminal series connection of each motor side AC/DC current transformers 2, and series circuit
First end and second end are connected respectively by corresponding HVDC transmission line with 5 input terminal of grid side DC/AC inverters；
The output terminal of motor side AC/DC current transformers 2 is connected with the input terminal of charge-discharge controller 3；Motor side AC/DC current transformers 2
The first capacitance is parallel between positive-negative output end；
It should be noted that motor side AC/DC current transformers 2 are used to the alternating current that wind-driven generator 1 generates passing through motor
Side AC/DC current transformers 2 are converted in the supreme pressure DC power transmission line of direct current electricity output.
Charge-discharge controller 3,3 cathode output end of charge-discharge controller are connected with 4 anode of energy storage device, and charge and discharge is automatically controlled
3 cathode output end of device processed is connected with 4 cathode of energy storage device；Charge-discharge controller 3 is used to selectively control the first capacitance
C1 charges or controls energy storage device 4 to discharge to the first capacitance C1 to energy storage device 4；
It should be noted that when the voltage that motor side AC/DC current transformers 2 export is more than predetermined voltage threshold, charge and discharge
Control device 3 controls motor side AC/DC current transformers 2 to charge to energy storage device 4, by the voltage drop of HVDC transmission line down to
Predetermined voltage threshold, while motor side AC/DC current transformers 2 also can give grid side DC/AC inversions by HVDC transmission line
Device 5 transmits direct current；When the voltage that motor side AC/DC current transformers 2 export is less than predetermined voltage threshold, charge-discharge controller
3 control energy storage devices 4 transmit direct current to grid side DC/AC inverters 5, improve the voltage of HVDC transmission line.
The control of each motor side AC/DC current transformers 2, each charge-discharge controller 3 and grid side DC/AC inverters 5
End processed connects a local control 6 respectively, and local control 6 becomes for generating pulse drive signal control motor side AC/DC
Flow the output of device 2, charge-discharge controller 3 and grid side DC/AC inverters 5；
Central controller 7, the input terminal of central controller 7 are connected with the output terminal of each local control 6, center control
The output terminal of device 7 is connected with the local control input terminal of grid side DC/AC inverters 5, for the electricity charge of entire wind power plant
Income Maximum turns to target, calculates the active power set-point of following n period grid side DC/AC inverters 5 and is sent to
The local control of grid side DC/AC inverters 5 is controlled；
Grid side DC/AC inverters 5,5 output terminal of grid side DC/AC inverters are connected with AC network；Grid side DC/AC
The second capacitance is parallel between 5 positive-negative input end of inverter.
It is understood that grid side DC/AC inverters 5 are used to be converted in the direct current in HVDC transmission line
Alternating current is inputted to AC network.
It should be noted that central controller 7 is sent to motor side AC/DC current transformers for generating corresponding pulse signal
2nd, charge-discharge controller 3 and grid side DC/AC inverters 5 are controlled, and specific control method is as follows：
The control method of motor side AC/DC current transformers 2, as shown in figure 3, Fig. 3 is a kind of motor provided by the utility model
The control method block diagram of side AC/DC current transformers：Obtain the rotation angle θ of wind-driven generator and three-phase current ia、ib、ic；To wind
The rotation angle θ of power generator, which differentiate, is calculated the rotary speed measure value ω of wind-driven generator, to wind-driven generator
Three electric current ia、ib、icObtain after static/rotation transformation d, q shaft current measured value ω of wind-driven generator, according to actual measurement
Wind speed generates the optimum speed set-point ω of wind-driven generator*, by optimum speed set-point ω*It is real with the rotating speed of wind-driven generator
The deviation pi regulator of measured value ω generates wind-driven generator q shaft current set-points i* q；Wind-driven generator d shaft current set-points i* d
It is set as zero；By d, q shaft current set-point and d, q shaft current measured value i of wind-driven generator acquisitionq、idDeviation, pass through respectively
Pi regulator is crossed, speed and current double closed loop PI controls is carried out and generates the first control voltage uq、ud；To the first control voltage uq、udInto
Row rotary/static converts to obtain uα、uβ, to uα、uβThe first pulse drive signal is generated after carrying out space vector pulse width modulation, it should
The output of signal control motor side AC/DC current transformers.
3 control method of charge-discharge controller：It is carried out according to the deviation of the set-point of the first capacitance voltage and measured value single
Closed loop PI controls generate the second control voltage, and carrying out pulse width modulation to the second control voltage obtains the second pulse drive signal
Charge-discharge controller 3 is sent to be controlled.
5 control method of grid side DC/AC inverters：According to 5 input AC network re-active power of grid side DC/AC inverters
The deviation of 5 input AC network re-active power measured value of set-point and grid side DC/AC inverters carry out single closed loop PI controls
Generate the 3rd control voltage；The 3rd pulse drive signal is obtained to the 3rd control voltage progress space vector pulse width modulation to be sent to
Grid side DC/AC inverters 5 are controlled.
It should be noted that the local control 6 that motor side AC/DC current transformers 2 connect is for the first driving pulse of generation
The output of signal control motor side AC/DC current transformers 2；The local control 6 that charge-discharge controller 3 connects is for generation second
Drive pulse signal controls the output of charging-discharging controller；The local control 6 that grid side DC/AC inverters 5 connect is used to produce
The output of raw 3rd drive pulse signal control grid side DC/AC inverters 5.
It is further known that central controller 7 is used for according to the current residual electricity of each energy storage device in whole device, not
The motor side AC/DC current transformers come corresponding to the n period forecasting wind speed result of Spot Price and future of n period are average defeated
Go out power, target is turned to the electricity charge Income Maximum of entire wind power plant, calculate following n period grid side DC/AC inverters
Active power set-point.The purpose is to make the electricity charge maximum revenue of entire wind power plant, the electricity charge income of entire wind power plant can
It is calculated according to the following formula：
Wherein, i=1 is defined, 2 ..., n is the sequence number of unit period, and j=1,2 ..., m are the sequence number of serial module structure,
One serial module structure includes a wind-driven generator, a motor side AC/DC current transformer, first capacitance, a charge and discharge
Controller and an energy storage device, P (i) are the i-th period grid side DC/AC inverter active power set-point, and Pri (i) is
The electricity price of i-th period, Δ t are the time span of unit period.Calculate having for following n period grid side DC/AC inverter
Work(power set-point comprises the following steps using particle swarm optimization algorithm, circular：
Step S1：In the range of the power rating of charge-discharge controller and grid side DC/AC inverters, random initializtion
The speed of population and position, speed and position as each particle period 1, population are made of z particle, each
Position of the particle in hyperspace is represented as the vector of following form：
X (k)=[P (1, k), P (2, k) ..., P (n, k)]T, k=1,2 ..., z
P (i, k) is active power set-point of k-th of particle in the i-th moment grid side DC/AC inverter；
Step S2：The initialization fitness value of each particle is calculated, fitness value is equal to the total of following n period wind power plant
It is more than penalty function caused by allowed band that electricity charge income, which subtracts each energy storage device remaining capacity in any one period,；It will be each
Initial history optimum position of the position of the period 1 of particle as each particle, is selected suitable from the population of period 1
The particle of response maximum and as the initial global history optimum position of population；
It should be noted that the fitness value of each particle calculates as follows in population：
Wherein, K is the weight coefficient of penalty function, and PEN (i, j, k) is stored up for j-th for k-th of particle in the i-th unit interval
Energy device remaining capacity is more than penalty function caused by allowed band, and penalty function calculation is as follows：
Es(i+1, j, k)=Es(i,j,k)+Ps(i,j,k)Δt；
Step S3：According to the speed in a cycle, position and the history of itself of a upper cycle each particle on each particle
The distance of optimum position, the distance between position and the current global history optimum position of a upper cycle each particle are calculated
The speed in each this cycle of particle is calculated according to the speed of the position of a upper cycle each particle and each particle in this cycle
To the position in each this cycle of particle, calculation formula is as follows：
Wherein, vt+1(k) it is the speed in described this cycle of particle, vt(k) it is the speed in a cycle on the particle, xt+1
(k) it is the position in described this cycle of particle, xt(k) it is the position in a cycle on the particle, Plb(k) it is one week on the particle
The history optimum position of phase, Pgb(k) it is the global history optimum position in a cycle in the population,c1、c2For constant, r1
And r2For uniformly random distribution rand；
Step S4：The obtained particles of step S3 are verified, if charge-discharge controller or grid side DC/AC inversions
The power of device overruns, then is limited to rated value；
Step S5：The fitness value of this cycle each particle is calculated, fitness value is equal to the total of following n period wind power plant
It is more than penalty function caused by allowed band that electricity charge income, which subtracts each energy storage device remaining capacity in any one period,；By this week
The fitness value of phase each particle is compared with the fitness value of itself history optimum position, the larger work of selection fitness value
For the history optimum position of corresponding particle；By the fitness value of this cycle each particle and the fitness of global history optimum position
Value compares, and selects the position of wherein fitness value maximum as global history optimum position；
Step S6：Judge whether to reach preset termination condition, if not reaching preset termination condition, return to step S3；If
Reach preset termination condition, then it is as follows can to obtain global history optimum position：
pgb=[P (1), P (2) ..., P (n)]T
By the P (1) in the global history optimum position of acquisition, P (2) ..., P (n) is used as n period grid side DC/ of future
The active power set-point of AC inverters is assigned to the local control of grid side DC/AC inverters.
Wherein, preset termination condition is less than predetermined threshold value for the increment of the fitness value of global history optimum position or reaches
To maximum iteration.
Wherein, the method Constrained item of the active power set-point of following n period grid side DC/AC inverters is calculated
Part, constraints include：
The remaining capacity of any energy storage device is in the range of the preset percentage of the rated capacity of energy storage device；
Wherein, E is setsNFor energy storage device rated capacity, Es(i, j) is the surplus of j-th of energy storage device of the i-th unit interval
Remaining electricity, Ps(i, j) is the output power of j-th of charging-discharging controller of the i-th unit interval, then has
20%EsN≤Es(i,j)+Ps(i, j) Δ t≤80%EsN, i=1,2 ..., n, j=1,2 ..., m
It is automatically controlled that the electric current of HVDC transmission line is equal to the corresponding charge and discharge of any one motor side AC/DC current transformers
The sum of output current of device processed；
Wherein, since the voltage of the first capacitance, high voltage dc bus voltage are kept constant, which can be expressed as
Pw(i, j) be the i-th unit interval, the output power of j-th of motor side AC/DC current transformer.
The output power of any one charge-discharge controller is not more than rated value；
Wherein, if PsNFor the rated power of charge-discharge controller, then have
|Ps(i,j)|≤PsN, i=1,2 ..., n, j=1,2 ..., m
The output power of grid side DC/AC inverters is not more than rated value.
Wherein, if PNFor the output power of grid side DC/AC inverters, then have
|P(i)|≤PNI=1,2 ..., n.
It should be noted that particle swarm optimization algorithm is being used to calculate following n period grid side DC/AC inverters
, it is necessary to define two n-dimensional vectors before active power set-point, description electricity price is respectively used to, grid side DC/AC inverters have
Work(power, define three n*m dimension matrix-vectors be respectively used to description energy storage device remaining capacity, energy storage device charge-discharge electric power,
Wind driven generator output power, 2 n-dimensional vectors are as follows：
Pri=[Pri (1), Pri (2) ..., Pri (n)]T, P=[P (1), P (2) ..., P (n)]T
Wherein Pri represents the electricity price of following n period, and P represents the active power of grid side DC/AC inverters.
Three n*m dimension matrixes are as follows：
Wherein, EsRepresent remaining capacity, PsRepresent the output power of charge-discharge controller, PwRepresent that motor side AC/DC becomes
Flow device average output power.After above-mentioned vector sum matrix is completed in definition, gather each energy storage device current residual electricity,
Motor side AC/DC current transformers corresponding to the Spot Price of following n period, following n period forecasting wind speed result are average defeated
Go out power, be assigned to above-mentioned defined Pri, EsAnd Pw。
As preference, charge-discharge controller 3 is two-way DC/DC charging-discharging controllers.
It should be noted that when 2 output end voltage of motor side AC/DC current transformers i.e. the first capacitance C1 voltages are more than default electricity
When pressing threshold value, charge-discharge controller 3 controls motor side AC/DC current transformers 2 to charge energy storage device 4, when the first capacitance
When C1 voltages are less than predetermined voltage threshold, charge-discharge controller 3 controls energy storage device 4 to be put to grid side DC/AC inverters 5
Electricity, due to being direct current in HVDC transmission line, charge-discharge controller 3 can select DC/DC charge and discharge
Controller, certainly, the utility model do not limit the concrete type of charge-discharge controller 3.
As preference, the device further includes voltage check device, voltage check device input terminal becomes with motor side AC/DC
The connection of 2 output terminal of device is flowed, voltage check device output terminal is connected with the input terminal of the local control of charge-discharge controller 3.
It should be noted that the local control of charge-discharge controller 3 is receiving the of voltage check device transmission
After one capacitance C1 voltage measured values, by measured value and have previously been stored in default in the local control of charge-discharge controller 3
Voltage threshold is compared, and generating corresponding drive pulse signal according to comparative result is sent to charging-discharging controller control energy storage
4 charge or discharge of device.
As preference, the device further includes electric quantity detection apparatus, the input terminal of the electric quantity detection apparatus and the storage
Energy device 4 connects, and the output terminal of the electric quantity detection apparatus is connected with the central controller 7.
It should be noted that remaining capacity of the central controller 7 in the energy storage device 4 for receiving electric quantity detection apparatus transmission
Afterwards, according to the current residual electricity of each energy storage device, the Spot Price of following n period and future n in whole device
Motor side AC/DC current transformer average output powers corresponding to period forecasting wind speed result, with the electricity charge income of entire wind power plant
Maximum turns to target, calculates the active power set-point of following n period grid side DC/AC inverters.
As preference, voltage check device is voltmeter；
It should be noted that voltmeter is in parallel with the first capacitance C1, the voltage of the first capacitance C1 is detected in real time.Certainly, originally
The concrete type of utility model not stop voltage detection device.
In other preferred embodiments, voltage check device is voltage transformer.
A kind of wind power generation high voltage direct current transportation device provided by the utility model, all increases in each motor side converter
One charge-discharge controller and energy storage device, when the alternating current that wind-driven generator generates is turned by motor side AC/DC current transformers
When being changed to direct current electricity output, judge whether the voltage of motor side AC/DC current transformers output is more than predetermined voltage threshold, if motor side
The voltage of AC/DC current transformers output is more than predetermined voltage threshold, then charge-discharge controller control energy storage device charges, and makes high pressure
DC bus-bar voltage reduces, if the voltage of motor side AC/DC current transformers output is less than predetermined voltage threshold, charge and discharge control dress
Put control energy storage device electric discharge so that high voltage dc bus voltage raises.It in this way, can be in each motor side AC/
When the direct current energy output of DC current transformers has fluctuation, the voltage of high voltage dc bus is maintained into a fixed value as far as possible,
The stability of high voltage dc bus voltage is improved, reduces the loss generated during electric energy transmission.
A kind of wind power generation high voltage direct current transportation device is provided the utility model above to be described in detail.Herein
In apply specific case the principle and embodiment of the utility model be set forth, the explanation of above example is simply used
Understand the method and its core concept of the utility model in help.It should be pointed out that for those skilled in the art
For, on the premise of the utility model principle is not departed from, can also to the utility model, some improvement and modification can also be carried out, these
Improvement and modification are also fallen into the protection domain of the utility model claims.
Claims (6)
1. a kind of wind power generation high voltage direct current transportation device, which is characterized in that including：
Several wind-driven generators, the output terminal of each wind-driven generator connect a motor side AC/DC current transformer respectively
Input terminal；
Multiple motor side AC/DC current transformers, the output terminal series connection of each motor side AC/DC current transformers, and series electrical
Road first end and second end are connected respectively by corresponding HVDC transmission line and grid side DC/AC inverter input terminals
It connects；The output terminal of the motor side AC/DC current transformers and the input terminal of charge-discharge controller connect；The motor side AC/DC
The first capacitance is parallel between the positive-negative output end of current transformer；
The charge-discharge controller, the charge-discharge controller cathode output end is connected with energy storage device anode, described to fill
Discharge control device cathode output end is connected with the energy storage device cathode；The charge-discharge controller is used to selectively control
Make first capacitance charges or controls the energy storage device to discharge to first capacitance to the energy storage device；
Each motor side AC/DC current transformers, each charge-discharge controller and the grid side DC/AC inverters
Control terminal connect a local control respectively, the local control controls the motor for generating pulse drive signal
The output of side AC/DC current transformers, the charge-discharge controller and the grid side DC/AC inverters；
Central controller, the input terminal of the central controller is connected with the output terminal of each local control, in described
The output terminal of centre controller is connected with the local control input terminal of the grid side DC/AC inverters, for calculating following n
The active power set-point of grid side DC/AC inverters described in a period is simultaneously sent to the office of the grid side DC/AC inverters
Portion's controller is controlled；
The grid side DC/AC inverters, the grid side DC/AC inverter output ends are connected with AC network；The power grid
The second capacitance is parallel between the DC/AC inverter positive-negative input ends of side.
2. the apparatus according to claim 1, which is characterized in that the charge-discharge controller is two-way DC/DC charge and discharge
Controller.
3. the apparatus of claim 2, which is characterized in that further include voltage check device, the voltage check device
Input terminal is connected with the motor side AC/DC current transformer output terminals, and the voltage check device output terminal and the charge and discharge are automatically controlled
The input terminal connection of the local control of device processed.
4. device according to claim 3, which is characterized in that further include electric quantity detection apparatus, the electric quantity detection apparatus
Input terminal be connected with the energy storage device, the output terminal of the electric quantity detection apparatus is connected with the central controller.
5. device according to claim 4, which is characterized in that the voltage check device is voltmeter.
6. device according to claim 4, which is characterized in that the voltage check device is voltage transformer.
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| CN107732955A (en) * | 2017-11-27 | 2018-02-23 | 广东工业大学 | A kind of wind power generation high voltage direct current transportation method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732955A (en) * | 2017-11-27 | 2018-02-23 | 广东工业大学 | A kind of wind power generation high voltage direct current transportation method and device |
| CN107732955B (en) * | 2017-11-27 | 2023-07-25 | 广东工业大学 | Wind power generation high-voltage direct current transmission method and device |
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