CN105337311A - Permanent-magnet direct-drive wind turbine generator set with low voltage ride through capability and coordination control strategy thereof - Google Patents
Permanent-magnet direct-drive wind turbine generator set with low voltage ride through capability and coordination control strategy thereof Download PDFInfo
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- CN105337311A CN105337311A CN201510864043.9A CN201510864043A CN105337311A CN 105337311 A CN105337311 A CN 105337311A CN 201510864043 A CN201510864043 A CN 201510864043A CN 105337311 A CN105337311 A CN 105337311A
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Abstract
The invention discloses a permanent-magnet direct-drive wind turbine generator set with the low voltage ride through capability and a coordination control strategy thereof. Control systems of the wind generator set comprise the pitch angle control system, the motor-side converter control system and the power-network-side converter control system. When network voltage drops, the pitch angle control system is used for reducing wind energy captured by a wind turbine so as to limit the rotating speed of a motor; direct-current-side capacitor voltage is monitored, and when the voltage exceeds a threshold value, the motor-side converter control system makes a rapid response so as to avoid direct-current capacitor overvoltage; meanwhile a power-network-side converter is used for providing reactive power for a power network so as to recover the network voltage. According to the control strategy, it is unnecessary to add hardware, an available control means of a permanent-magnet direct-drive wind turbine generator is fully utilized, and the low voltage ride through capability of the permanent-magnet direct-drive wind turbine generator within a full wind field range can be effectively improved.
Description
Technical field
The invention belongs to wind energy power technology field, especially a kind of coordination control strategy realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing.
Background technology
Wind power generation is as a kind of important generation of electricity by new energy mode, fast-developing in China.2014, the whole nation (except Taiwan) adding new capacity 23196MW, increased by 44.2% on a year-on-year basis.Along with the lifting of wind power generation proportion in mains supply, the wind energy conversion system off-grid accident causing grid voltage sags due to electric network fault or disturbance and cause frequently occurs.Therefore, the low voltage ride-through capability studying Wind turbines has very important realistic meaning.
Typical permanent magnet direct-drive blower fan system is primarily of formations such as wind energy conversion system, permanent magnet generator, motor side current transformer, DC capacitor, grid side current transformer, transformer and control system.After a large amount of permanent magnet direct-drive unit access electrical networks, if do not possess low voltage ride-through capability, when the grid collapses, unit by large area off-grid, thus causes tremendous influence to the stability of electrical network.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, the wind energy that wind energy conversion system is caught is equal with the electric energy that current transformer is carried to electrical network, i.e. i
swith i
gequal.Now, the charging or discharging current i of electric capacity
dcbe 0, the rate of change of capacitance terminal voltage is 0, and at this moment capacitance terminal voltage is a fixed value.During grid collapses, current transformer significantly reduces to the ability of electrical network transmission power, but due to motor side current transformer control independence, motor side current transformer input power P
swill keep relatively fixing, it is inner and to DC capacitor charging, cause capacitance terminal voltage to increase sharply that the unnecessary input energy of such motor side current transformer will be trapped in unit.Therefore, be necessary to adopt suitable control strategy, reduce the uneven energy that unit bears when electric network fault, to improve the low voltage ride-through capability of PMSG.
Find by prior art documents, AdvancedFaultRide-ThroughTechniqueforPMSGWindTurbineSyst emsUsingLine-SideConverterasSTATCOM (NguyenTH, LeeD., " AAdvancedFaultRide-ThroughTechniqueforPMSGWindTurbineSys temsUsingLine-SideConverterasSTATCOM ", IndustrialElectronics, IEEETransactionson2012, 60 (7): 2842-2850) by adding electric power generation unloading resistance or energy-storage travelling wave tube ensures that unit realizes low voltage crossing in permanent magnet direct-drive unit, but additional hardware equipment can increase system cost and maintenance difficulties.: CoordinatedcontrolforactiveandreactivepowerofPMSG-basedw indturbinetoenhancetheLVRTcapability (DongS, WangY, LiH., " CoordinatedcontrolforactiveandreactivepowerofPMSG-basedw indturbinetoenhancetheLVRTcapability ", ElectricalMachinesandSystems (ICEMS), 201215thInternationalConferenceon, Sapporo, 2012.IEEE.) by limiting at the electromagnetic power of electric network fault limit direct driving motor the power inputing to DC bus capacitor and grid side current transformer, the program improves the control strategy of conventional P MSG current transformer, avoid and increase unnecessary hardware protection device, but it does not limit the ability of blower fan capturing wind energy during electric network fault, thus unit low voltage crossing burden can not effectively be alleviated.
Summary of the invention
The object of the invention is to solve above-mentioned the deficiencies in the prior art part, a kind of coordination control strategy realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing is provided, the control device that abundant use permanent magnet direct-drive blower fan self is available, effectively can improve the low voltage ride-through capability of permanent magnet direct-drive blower fan within the scope of full blast territory.
Object of the present invention is achieved through the following technical solutions:
A kind of permanent magnet direct drive synthronous wind-mill generator group realizing low voltage crossing, it is characterized in that, permanent magnet direct drive synthronous wind-mill generator group comprises wind energy conversion system, permanent magnet generator, motor side current transformer, DC capacitor, grid side current transformer, transformer and control system, described wind energy conversion system is connected with the rotor of described permanent magnet direct-drive synchronous generator, the stator of described permanent magnet direct-drive synchronous generator is connected to described transformer through described motor side current transformer, DC capacitor and grid side current transformer successively, and described transformer is connected to the grid.
Described control system comprises award setting system, motor side converter control system and grid side converter control system, described award setting systemic effect is in wind energy conversion system, described motor side converter control system acts on motor side current transformer, and described grid side converter control system acts on grid side current transformer.
Realize a coordination control strategy for the permanent magnet direct drive synthronous wind-mill generator group of low voltage crossing, it is characterized in that, described control strategy comprises the following steps:
Step S1, detect current electric grid voltage magnitude, if judge when voltage magnitude drops to below 90%, electrical network is in malfunction;
Step S2, according to the electric network state that step 1 judges, award setting Systematic selection mode of operation;
Step S3, according to the electric network state that step 1 judges, motor side converter control system selects mode of operation;
Step S4, according to the electric network state that step 1 judges, grid side converter control system selects mode of operation.
Described step S2 comprises:
Step S21, when electrical network is normal, award setting system is with generator speed ω
mfor input signal, as generator speed ω
mexceed given rotating speed maximum ω
reftime, award setting system works, by increasing propeller pitch angle β, is exerted oneself to reduce wind energy conversion system;
Step S22, when the grid fails, the reference value of propeller pitch angle changes allows lower limit reference value U by electrical network
grefcontrol, when detecting that grid voltage amplitude drops to below 90%, award setting system starts, propeller pitch angle increases rapidly.
Described step S3 comprises:
Step S31, when electrical network is normal, generator amature speed reference ω
refobtained by wind energy maximal power tracing algorithm, by with actual generator rotational speed omega
mrelatively, the speed discrepancy obtained obtains active current reference value i through pi controller
sqref, and then control the power output of generator;
Step S32, during electric network fault, DC capacitor terminal voltage changes and is controlled by motor side current transformer; Detect DC capacitor terminal voltage U
dcif it is higher than rated value U
dcreftime, control system action, avoids DC capacitor overvoltage.
Described step S4 comprises:
Step S41, when electrical network is normal, grid side current transformer adopts the control structure of outer voltage, current inner loop, and outer voltage keeps DC capacitor terminal voltage to stablize, and current inner loop realizes the high performance steady operation of control system and fast dynamic response;
Step S42, during electric network fault, control system action, makes grid side current transformer send certain reactive power to help the recovery of line voltage.
Beneficial effect of the present invention: control strategy provided by the invention need not add any hardware, fully uses the control device that permanent magnet direct-drive blower fan self is available, effectively can improve the low voltage ride-through capability of permanent magnet direct-drive blower fan within the scope of full blast territory.
Accompanying drawing explanation
Fig. 1 is a kind of permanent magnet direct-drive blower fan structure chart realizing the coordination control strategy of permanent magnet direct drive synthronous wind-mill generator group low voltage crossing;
Fig. 2 is a kind of award setting system construction drawing realizing the coordination control strategy of permanent magnet direct drive synthronous wind-mill generator group low voltage crossing.
Fig. 3 is a kind of control structure figure realizing the motor side current transformer of the coordination control strategy of permanent magnet direct drive synthronous wind-mill generator group low voltage crossing.
Fig. 4 is a kind of control structure figure realizing the grid side current transformer of the coordination control strategy of permanent magnet direct drive synthronous wind-mill generator group low voltage crossing.
Fig. 5 is a kind of generator speed figure of coordination control strategy when line voltage falls fault realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing.
Fig. 6 is a kind of DC capacitor busbar voltage figure of coordination control strategy when line voltage falls fault realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing.
Fig. 7 is a kind of grid side map of current of coordination control strategy when line voltage falls fault realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is further detailed explanation, but embodiments of the present invention are not limited thereto.
A kind of permanent magnet direct drive synthronous wind-mill generator group typically realizing low voltage crossing as shown in Figure 1, permanent magnet direct drive synthronous wind-mill generator group comprises wind energy conversion system, permanent magnet generator, motor side current transformer, DC capacitor, grid side current transformer, transformer and control system, described wind energy conversion system is connected with the rotor of described permanent magnet direct-drive synchronous generator, the stator of described permanent magnet direct-drive synchronous generator is connected to described transformer through described motor side current transformer, DC capacitor and grid side current transformer successively, and described transformer is connected to the grid.
Described control system comprises award setting system, motor side converter control system and grid side converter control system, described award setting systemic effect is in wind energy conversion system, described motor side converter control system acts on motor side current transformer, and described grid side converter control system acts on grid side current transformer.
Fig. 2 is award setting system construction drawing.Award setting system determines the ability of blower fan capturing wind energy.When wind speed is under rated value, award setting system does not work, and propeller pitch angle is 0; When wind speed overrate, control system reduces the wind energy of catching by increasing propeller pitch angle β, exceeds the speed limit to avoid generator.Under normal circumstances, award setting system is with generator speed ω
mfor input signal, work as rotational speed omega
mexceed given rotating speed maximum ω
reftime, award setting system works, exerts oneself to reduce wind energy conversion system.During electric network fault, the reference value of propeller pitch angle changes allows lower limit reference value U by electrical network
grefcontrol, when detecting that grid voltage amplitude falls, award setting system works immediately, and propeller pitch angle increases rapidly.Servo link can simulate the dynamic response process of pitch-controlled system, and limits pace of change and the scope of propeller pitch angle.
Fig. 3 is the control structure figure of motor side current transformer.Motor side current transformer can control generator speed makes it operate in optimum tip-speed ratio place, thus reaches the object of catching maximal wind-energy.Generator-side converter adopts based on stator magnetic linkage oriented double-closed-loop control, the reference value i of generator d axle reactive current
sdrefequal zero, q shaft current controls the active power that generator exports.Under normal circumstances, generator amature speed reference ω
refobtained by wind energy maximal power tracing algorithm, by with actual generator rotational speed omega
mrelatively, the speed discrepancy obtained obtains active current reference value i through pi controller
sqref, and then control the power output of generator.Between line voltage age at failure, DC capacitor terminal voltage changes and is controlled by motor side current transformer.Detect DC capacitor terminal voltage U
dcif it is higher than rated value U
dcreftime, controller action, avoids DC capacitor overvoltage.
Fig. 4 is the control structure figure of grid side current transformer.Grid side current transformer controls DC capacitor voltage on the one hand and stablizes, and ensures that the active power that generator sends injects electrical network; According to the needs of grid side, certain reactive power can be sent on the other hand.Grid side current transformer adopts based on voltage oriented vector control.Choosing grid side space vector of voltage direction is d axle in synchronous rotary d-q coordinate system, and 90 degree, the advanced d axle of q axle, then achieve the uneoupled control of active power and reactive power.Grid side active power is only relevant with d shaft current, and reactive power is only relevant with q shaft current.Under normal circumstances, grid side current transformer adopts the control structure of outer voltage, current inner loop.Outer voltage can keep DC capacitor terminal voltage to stablize, and current inner loop can realize the high performance steady operation of control system and fast dynamic response.During electric network fault, grid side current transformer can send certain reactive power to help the recovery of line voltage.。
For correctness and the validity of the permanent magnet direct-drive blower fan low voltage crossing coordination control strategy of checking the present invention proposition, based on Matlab/Simulink, grid voltage sags example is emulated herein.Before electric network fault occurs, under permanent magnet direct-driving aerogenerator group operates in rated wind speed, system is run with unity power factor state, and system emulation parameter is as follows: wind energy conversion system atmospheric density is 1.225kg/m3, blade radius 38.8m; Magneto alternator rated power 1MW, rated voltage 690V, number of pole-pairs 40; Grid side current transformer reactor resistance 0.002 Ω, inductance 0.3mH, line voltage 690V; DC capacitor 100mF, setting voltage 1500V.When 0.4s, line voltage generation three-phase symmetrical falls fault, and falling the degree of depth is 60%, and when the duration is 200ms, 0.6s, line voltage recovers.As shown in Fig. 5, Fig. 6, Fig. 7, when line voltage falls fault, generator speed, DC capacitor busbar voltage, grid side electric current are all in safe range, and namely PMSG achieves low voltage crossing.
Above a kind of coordination control strategy realizing permanent magnet direct drive synthronous wind-mill generator group low voltage crossing provided by the present invention is described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. one kind realizes the permanent magnet direct drive synthronous wind-mill generator group of low voltage crossing, it is characterized in that, permanent magnet direct drive synthronous wind-mill generator group comprises wind energy conversion system, permanent magnet generator, motor side current transformer, DC capacitor, grid side current transformer, transformer and control system, described wind energy conversion system is connected with the rotor of described permanent magnet direct-drive synchronous generator, the stator of described permanent magnet direct-drive synchronous generator is connected to described transformer through described motor side current transformer, DC capacitor and grid side current transformer successively, and described transformer is connected to the grid.
2. a kind of permanent magnet direct drive synthronous wind-mill generator group realizing low voltage crossing according to claim 1, it is characterized in that, described control system comprises award setting system, motor side converter control system and grid side converter control system, described award setting systemic effect is in wind energy conversion system, described motor side converter control system acts on motor side current transformer, and described grid side converter control system acts on grid side current transformer.
3., based on the coordination control strategy realizing the permanent magnet direct drive synthronous wind-mill generator group of low voltage crossing according to claim 2, it is characterized in that, described control strategy comprises the following steps:
Step S1, detect current electric grid voltage magnitude, if judge when voltage magnitude drops to below 90%, electrical network is in malfunction;
Step S2, according to the electric network state that step 1 judges, award setting Systematic selection mode of operation;
Step S3, according to the electric network state that step 1 judges, motor side converter control system selects mode of operation;
Step S4, according to the electric network state that step 1 judges, grid side converter control system selects mode of operation.
4. a kind of coordination control strategy realizing the permanent magnet direct drive synthronous wind-mill generator group of low voltage crossing according to claim 3, it is characterized in that, described step S2 comprises:
Step S21, when electrical network is normal, award setting system is with generator speed ω
mfor input signal, as generator speed ω
mexceed given rotating speed maximum ω
reftime, award setting system works, by increasing propeller pitch angle β, is exerted oneself to reduce wind energy conversion system;
Step S22, when the grid fails, the reference value of propeller pitch angle changes allows lower limit reference value U by electrical network
grefcontrol, when detecting that grid voltage amplitude drops to below 90%, award setting system starts, propeller pitch angle increases rapidly.
5. a kind of coordination control strategy realizing the permanent magnet direct drive synthronous wind-mill generator group of low voltage crossing according to claim 3, it is characterized in that, described step S3 comprises:
Step S31, when electrical network is normal, generator amature speed reference ω
refobtained by wind energy maximal power tracing algorithm, by with actual generator rotational speed omega
mrelatively, the speed discrepancy obtained obtains active current reference value i through pi controller
sqref, and then control the power output of generator;
Step S32, during electric network fault, DC capacitor terminal voltage changes and is controlled by motor side current transformer; Detect DC capacitor terminal voltage U
dcif it is higher than rated value U
dcreftime, control system action, avoids DC capacitor overvoltage.
6. a kind of coordination control strategy realizing the permanent magnet direct drive synthronous wind-mill generator group of low voltage crossing according to claim 3, it is characterized in that, described step S4 comprises:
Step S41, when electrical network is normal, grid side current transformer adopts the control structure of outer voltage, current inner loop, and outer voltage keeps DC capacitor terminal voltage to stablize, and current inner loop realizes the high performance steady operation of control system and fast dynamic response;
Step S42, during electric network fault, control system action, makes grid side current transformer send certain reactive power to help the recovery of line voltage.
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Cited By (7)
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| CN109519319A (en) * | 2018-11-27 | 2019-03-26 | 湖南大学 | A kind of direct-drive permanent-magnetism hydroelectric power system |
| CN110417044A (en) * | 2018-04-27 | 2019-11-05 | 哈尔滨工业大学 | A kind of control method for coordinating based on permanent-magnet synchronous wind power system low voltage crossing |
| 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 |
| 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 |
| CN113315114A (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 fan direct current grid-connected system and low voltage ride through control method thereof |
| 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 |
| 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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