CN105337311B - A kind of permanent magnet direct drive synthronous wind-mill generator group for realizing low voltage crossing and its coordination control strategy - Google Patents
A kind of permanent magnet direct drive synthronous wind-mill generator group for realizing low voltage crossing and its coordination control strategy Download PDFInfo
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- CN105337311B CN105337311B CN201510864043.9A CN201510864043A CN105337311B CN 105337311 B CN105337311 B CN 105337311B CN 201510864043 A CN201510864043 A CN 201510864043A CN 105337311 B CN105337311 B CN 105337311B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The present invention discloses a kind of permanent magnet direct drive synthronous wind-mill generator group for realizing low voltage crossing and its coordination control strategy, the control system of the wind power generating set includes award setting system, motor side converter control system and grid side converter control system, when grid voltage sags, the wind energy of wind energy conversion system capture is reduced using award setting system, to limit the rotating speed of generator；DC capacitor voltage is monitored, when voltage exceedes threshold value, motor side control system quickly responds, and avoids DC capacitor overvoltage；Reactive power is provided to power network using power network side converter simultaneously, to help the recovery of line voltage.Control strategy proposed by the present invention does not have to add any hardware, fully uses the available control device of permanent magnet direct-drive blower fan itself, can effectively improve low voltage ride-through capability of the permanent magnet direct-drive blower fan in the range of full blast domain.
Description
Technical field
The invention belongs to wind energy power technology field, especially one kind to realize the low electricity of permanent magnet direct drive synthronous wind-mill generator group
Press the coordination control strategy passed through.
Background technology
Wind-power electricity generation is as a kind of important generation of electricity by new energy mode, Chinese fast-developing.2014, platform (was removed in the whole nation
Gulf area is outer) adding new capacity 23196MW, increase by 44.2% on a year-on-year basis.With wind-power electricity generation power network power supply in proportion
Lifting, due to electric network fault or disturbance cause grid voltage sags and caused by wind energy conversion system off-grid accident frequently occur.Therefore,
The low voltage ride-through capability of research Wind turbines has very important realistic meaning.
Typical permanent magnet direct-drive blower fan system mainly by wind energy conversion system, magneto, motor side converter, DC capacitor,
Power network side converter, transformer and control system etc. are formed.After substantial amounts of permanent magnet direct-drive unit access power network, if do not possessed low
Voltage ride through ability, when the grid collapses, unit is by large area off-grid, so as to cause huge shadow to the stability of power network
Ring.Wind energy conversion system is used for capturing wind energy, and it determines the output of whole wind generator system rating of set.Under normal circumstances, wind energy conversion system
The electric energy that the wind energy and current transformer of capture convey to power network is equal, i.e. isWith igIt is equal.Now, the charging or discharging current i of electric capacitydcFor 0,
The rate of change of electric capacity terminal voltage is 0, and at this moment electric capacity terminal voltage is a fixed value.During grid collapses, current transformer is defeated to power network
The ability of power is sent to be greatly decreased, but due to the independence of motor side converter control, motor side converter input power PsStill
It will keep being relatively fixed, the unnecessary input energy of such motor side converter will be trapped in inside unit and fill DC capacitor
Electricity, electric capacity terminal voltage is caused to be increased sharply.Therefore, it is necessary to using appropriate control strategy, reduce unit and born in electric network fault
Uneven energy, to improve PMSG low voltage ride-through capability.
Find by prior art documents, Advanced Fault Ride-Through Technique for
PMSGWind Turbine Systems Using Line-Side Converter as STATCOM(Nguyen T H,Lee
D., " AAdvanced Fault Ride-Through Technique for PMSG Wind Turbine Systems
Using Line-Side Converter as STATCOM ", Industrial Electronics, IEEE
Transactions on 2012,60(7):2842-2850) by adding electric power generation unloading resistance or energy storage member in permanent magnet direct-drive unit
Part ensures that unit realizes low voltage crossing, but additional hardware equipment can increase system cost and maintenance difficulties.:
Coordinated control for active and reactive power ofPMSG-based wind turbine
To enhance the LVRT capability (Dong S, Wang Y, Li H., " Coordinated control for
active and reactive power ofPMSG-based wind turbine to enhance the LVRT
Capability ", Electrical Machines and Systems (ICEMS), 2012 15th International
Conference on, Sapporo, 2012.IEEE.) limited by limiting the electromagnetic power of direct driving motor in electric network fault
To DC bus capacitor and the power of power network side converter, the program improves the control strategy of traditional PMSG current transformers, keeps away for input
Exempt from the unnecessary hardware protection device of increase, but it is not limiting as the ability that blower fan captures wind energy during electric network fault, thus
Unit low voltage crossing burden can not effectively be mitigated.
The content of the invention
The invention aims to solve above-mentioned the shortcomings of the prior art, there is provided one kind realizes that permanent magnetism is straight
The coordination control strategy of drive synthronous wind-mill generator group low voltage crossing, fully use the available control of permanent magnet direct-drive blower fan itself
Means, low voltage ride-through capability of the permanent magnet direct-drive blower fan in the range of full blast domain can be effectively improved.
The purpose of the present invention is achieved through the following technical solutions:
A kind of permanent magnet direct drive synthronous wind-mill generator group for realizing low voltage crossing, it is characterised in that permanent magnet direct-drive is synchronous
Wind power generating set include wind energy conversion system, magneto, motor side converter, DC capacitor, power network side converter, transformer and
Control system, the wind energy conversion system are connected with the rotor of the permanent magnet direct-drive synchronous generator, the permanent magnet direct-drive synchronous generator
Stator be connected to the transformer by the motor side converter, DC capacitor and power network side converter successively, it is described
Transformer is connected to the grid.
The control system includes award setting system, motor side converter control system and power network side converter control
System processed, for the award setting systemic effect in wind energy conversion system, the motor side converter control system acts on motor side change
Device is flowed, the grid side converter control system acts on power network side converter.
A kind of coordination control strategy for the permanent magnet direct drive synthronous wind-mill generator group for realizing low voltage crossing, its feature exist
In the control strategy comprises the following steps：
Step S1, current electric grid voltage magnitude is detected, power network is in if judging when voltage magnitude drops to less than 90%
Malfunction；
Step S2, the electric network state judged according to step 1, award setting Systematic selection mode of operation；
Step S3, the electric network state judged according to step 1, motor side converter control system selection mode of operation；
Step S4, the electric network state judged according to step 1, grid side converter control system selection mode of operation.
The step S2 includes：
Step S21, when power network is normal, award setting system is with generator speed ωmFor input signal, work as generator
Rotational speed omegamMore than given rotating speed maximum ωrefWhen, award setting system works by increasing propeller pitch angle β, to reduce wind-force
Machine is contributed；
Step S22, when the grid fails, the reference value of propeller pitch angle changes allows lower limit reference value U by power networkgrefControl, when
When detecting that grid voltage amplitude drops to less than 90%, award setting system starts, propeller pitch angle increases rapidly.
The step S3 includes：
Step S31, when power network is normal, generator amature speed reference ωrefObtained by wind energy maximal power tracing algorithm
Arrive, by with actual generator rotational speed omegamCompare, obtained speed discrepancy obtains watt current by pi controller and referred to
Value isqref, and then control the power output of generator；
Step S32, during electric network fault, DC capacitor terminal voltage changes to be controlled by motor side converter；Detect DC capacitor end
Voltage UdcIf it is higher than rated value UdcrefWhen, control system action, avoid DC capacitor overvoltage.
The step S4 includes：
Step S41, when power network is normal, power network side converter is using outer voltage, the control structure of current inner loop, outside voltage
Ring keeps DC capacitor terminal voltage stable, and current inner loop realizes the high performance steady-state operation of control system and fast dynamic response；
Step S42, during electric network fault, control system action, power network side converter is set to send certain reactive power to help
Help the recovery of line voltage.
Beneficial effect of the present invention：Control strategy provided by the invention does not have to add any hardware, fully using permanent magnet direct-drive
The available control device of blower fan itself, low voltage crossing energy of the permanent magnet direct-drive blower fan in the range of full blast domain can be effectively improved
Power.
Brief description of the drawings
Fig. 1 is that a kind of permanent magnetism for the coordination control strategy for realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing is straight
Drive blower structure chart；
Fig. 2 is a kind of propeller pitch angle for the coordination control strategy for realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing
Control system architecture figure.
Fig. 3 is a kind of motor side for the coordination control strategy for realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing
The control structure figure of current transformer.
Fig. 4 is a kind of grid side for the coordination control strategy for realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing
The control structure figure of current transformer.
Fig. 5 is a kind of coordination control strategy for realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing in power network electricity
Generator speed figure during failure is fallen in pressure life.
Fig. 6 is a kind of coordination control strategy for realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing in power network electricity
DC capacitor busbar voltage figure during failure is fallen in pressure life.
Fig. 7 is a kind of coordination control strategy for realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing in power network electricity
Grid side map of current during failure is fallen in pressure life.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is further detailed explanation, but embodiments of the present invention are not
It is limited to this.
It is a kind of typically to realize the permanent magnet direct drive synthronous wind-mill generator group of low voltage crossing as shown in figure 1, permanent magnet direct-drive
Synchro wind generator group includes wind energy conversion system, magneto, motor side converter, DC capacitor, power network side converter, transformation
Device and control system, the wind energy conversion system are connected with the rotor of the permanent magnet direct-drive synchronous generator, and the permanent magnet direct-drive is synchronously sent out
The stator of motor is connected to the transformer by the motor side converter, DC capacitor and power network side converter successively,
The transformer is connected to the grid.
The control system includes award setting system, motor side converter control system and power network side converter control
System processed, for the award setting systemic effect in wind energy conversion system, the motor side converter control system acts on motor side change
Device is flowed, the grid side converter control system acts on power network side converter.
Fig. 2 is award setting system construction drawing.Award setting system determines the ability of blower fan capture wind energy.Wind speed exists
When under rated value, award setting system does not work, propeller pitch angle 0；When wind speed overrate, control system passes through increase
Propeller pitch angle β reduces the wind energy of capture, to avoid generator from exceeding the speed limit.Under normal circumstances, award setting system is turned with generator
Fast ωmFor input signal, work as rotational speed omegamMore than given rotating speed maximum ωrefWhen, award setting system work, to reduce wind
Power machine is contributed.During electric network fault, the reference value of propeller pitch angle changes allows lower limit reference value U by power networkgrefControl, when detecting power network
When voltage magnitude falls, award setting system works immediately, and propeller pitch angle increases rapidly.Servo link can simulate pitch-controlled system
Dynamic response process, and limit the pace of change and scope of propeller pitch angle.
Fig. 3 is the control structure figure of motor side converter.Motor side converter can control generator speed to make its operation
At optimum tip-speed ratio, so as to reach the purpose of capture maximal wind-energy.Generator-side converter uses is determined based on stator magnetic linkage
To double-closed-loop control, the reference value i of generator d axle reactive currentssdrefEqual to having for zero, q shaft currents control generator output
Work(power.Under normal circumstances, generator amature speed reference ωrefObtained by wind energy maximal power tracing algorithm, by with reality
Border generator speed ωmCompare, obtained speed discrepancy obtains watt current reference value i by pi controllersqref, and then
Control the power output of generator.During line voltage failure, DC capacitor terminal voltage changes to be controlled by motor side converter.Detection
DC capacitor terminal voltage UdcIf it is higher than rated value UdcrefWhen, controller action, avoid DC capacitor overvoltage.
Fig. 4 is the control structure figure of power network side converter.On the one hand control DC capacitor voltage is stable for power network side converter,
Ensure the active power injection power network that generator is sent；On the other hand certain idle work(can be sent according to the needs of grid side
Rate.Power network side converter is used based on voltage oriented vector controlled.Grid side space vector of voltage direction is chosen to revolve to be synchronous
Turn the d axles in d-q coordinate systems, 90 degree of the advanced d axles of q axles, then realize the uneoupled control of active power and reactive power.Grid side
Active power is only relevant with d shaft currents, and reactive power is only relevant with q shaft currents.Under normal circumstances, power network side converter is using electricity
Press outer shroud, the control structure of current inner loop.Outer voltage can keep DC capacitor terminal voltage stable, and current inner loop can realize control
The high performance steady-state operation of system and fast dynamic response.During electric network fault, power network side converter can send certain idle work(
Rate is to help the recovery of line voltage..
To verify the correctness and validity of permanent magnet direct-drive blower fan low voltage crossing coordination control strategy proposed by the present invention,
Grid voltage sags example is emulated based on Matlab/Simulink herein.Before electric network fault occurs, permanent magnet direct-drive wind-force
Generating set is operated under rated wind speed, and system is run with unity power factor state, and system emulation parameter is as follows：Wind energy conversion system is empty
Air tightness is 1.225kg/m3, blade radius 38.8m；Magneto alternator rated power 1MW, rated voltage 690V are extremely right
Number 40；Power network side converter reactor resistance 0.002 Ω, inductance 0.3mH, line voltage 690V；DC capacitor 100mF, setting
Voltage 1500V.In 0.4s, line voltage occurs three-phase symmetrical and falls failure, drop depth 60%, and the duration is
Line voltage recovers when 200ms, 0.6s.As shown in Fig. 5, Fig. 6, Fig. 7, when line voltage falls failure, generator speed,
DC capacitor busbar voltage, grid side electric current are in safe range, i.e., PMSG realizes low voltage crossing.
Above to a kind of coordination for realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing provided by the present invention
Control strategy is described in detail, and specific case used herein is explained the principle and embodiment of the present invention
State, the explanation of above example is only intended to help the method and its core concept for understanding the present invention；Meanwhile for this area
Those skilled in the art, according to the thought of the present invention, there will be changes in specific embodiments and applications, to sum up institute
State, this specification content should not be construed as limiting the invention.
Claims (4)
- A kind of 1. coordination control strategy for the permanent magnet direct drive synthronous wind-mill generator group for realizing low voltage crossing, it is characterised in that： Permanent magnet direct drive synthronous wind-mill generator group includes wind energy conversion system, magneto, motor side converter, DC capacitor, grid side and become Stream device, transformer and control system, the wind energy conversion system are connected with the rotor of the permanent magnet direct-drive synchronous generator, and the permanent magnetism is straight The stator of drive synchronous generator is connected to described by the motor side converter, DC capacitor and power network side converter successively Transformer, the transformer are connected to the grid；The control system includes award setting system, motor side converter control system and power network side converter control system System, the award setting systemic effect act on motor side converter in wind energy conversion system, the motor side converter control system, The grid side converter control system acts on power network side converter；The control strategy comprises the following steps：Step S1, current electric grid voltage magnitude is detected, power network is in failure if judging when voltage magnitude drops to less than 90% State；Step S2, the electric network state judged according to step 1, award setting Systematic selection mode of operation；Step S3, the electric network state judged according to step 1, motor side converter control system selection mode of operation；Step S4, the electric network state judged according to step 1, grid side converter control system selection mode of operation.
- A kind of 2. coordination control of permanent magnet direct drive synthronous wind-mill generator group for realizing low voltage crossing according to claim 1 System strategy, it is characterised in that the step S2 includes：Step S21, when power network is normal, award setting system is with generator speed ωmFor input signal, work as generator speed ωmMore than given rotating speed maximum ωrefWhen, the work of award setting system is gone out by increasing propeller pitch angle β with reducing wind energy conversion system Power；Step S22, when the grid fails, the reference value of propeller pitch angle changes allows lower limit reference value U by power networkgrefControl, when detecting When grid voltage amplitude drops to less than 90%, award setting system starts, propeller pitch angle increases rapidly.
- A kind of 3. coordination control of permanent magnet direct drive synthronous wind-mill generator group for realizing low voltage crossing according to claim 1 System strategy, it is characterised in that the step S3 includes：Step S31, when power network is normal, generator amature speed reference ωrefObtained, led to by wind energy maximal power tracing algorithm Cross and actual generator rotational speed omegamCompare, obtained speed discrepancy obtains watt current reference value by pi controller isqref, and then control the power output of generator；Step S32, during electric network fault, DC capacitor terminal voltage changes to be controlled by motor side converter；Detect DC capacitor terminal voltage UdcIf it is higher than rated value UdcrefWhen, control system action, avoid DC capacitor overvoltage.
- A kind of 4. coordination control of permanent magnet direct drive synthronous wind-mill generator group for realizing low voltage crossing according to claim 1 System strategy, it is characterised in that the step S4 includes：Step S41, when power network is normal, power network side converter is protected using outer voltage, the control structure of current inner loop, outer voltage It is stable to hold DC capacitor terminal voltage, current inner loop realizes the high performance steady-state operation of control system and fast dynamic response；Step S42, during electric network fault, control system action, power network side converter is set to send certain reactive power to help electricity The recovery of net voltage.
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| CN110417044B (en) * | 2018-04-27 | 2022-11-22 | 哈尔滨工业大学 | Coordination control method based on permanent magnet synchronous wind power system low voltage ride through |
| CN109519319A (en) * | 2018-11-27 | 2019-03-26 | 湖南大学 | A kind of direct-drive permanent-magnetism hydroelectric power system |
| CN114204789A (en) * | 2020-09-18 | 2022-03-18 | 国网浙江省电力有限公司电力科学研究院 | Voltage source type AC-DC converter and direct current side fault ride-through method thereof |
| CN113054686A (en) * | 2021-05-11 | 2021-06-29 | 东北电力大学 | Low voltage ride through control method and device for permanent magnet wind turbine generator |
| CN113315114B (en) * | 2021-05-31 | 2023-04-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Multiphase fan direct current grid-connected system and low-voltage ride through control method thereof |
| CN113315113A (en) * | 2021-05-31 | 2021-08-27 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Multiphase wind driven generator open-phase operation control method, device, equipment and medium |
| CN114362208A (en) * | 2022-01-07 | 2022-04-15 | 阳光电源股份有限公司 | Energy storage wind power converter and control method thereof |
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