CN102290826A - Method for realizing low-voltage fault ride-through of power grid by using grid-connected asynchronous wind generator set - Google Patents
Method for realizing low-voltage fault ride-through of power grid by using grid-connected asynchronous wind generator set Download PDFInfo
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- CN102290826A CN102290826A CN2011102273616A CN201110227361A CN102290826A CN 102290826 A CN102290826 A CN 102290826A CN 2011102273616 A CN2011102273616 A CN 2011102273616A CN 201110227361 A CN201110227361 A CN 201110227361A CN 102290826 A CN102290826 A CN 102290826A
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Abstract
The invention discloses a method for realizing low-voltage fault ride-through of a power grid by using a grid-connected asynchronous wind generator set, comprising the following steps: accessing a two-series one-parallel passive resistance network or a one-series one-parallel passive resistance network to the asynchronous wind generator set and the power grid; and controlling an Ss1 bypass switch, an Ss2 bypass switch and an Sp switch to realize a low-voltage fault ride-through function of the power grid. The method has the beneficial effects that the transient values of the voltage of the wind generator set, stator currents, rotor currents, flux linkages, electromagnetic torques and the like are limited in an allowed range; meanwhile, the active power, the passive power and the currents are provided maximally for the power grid so as to support the power grid; and a line protection device is driven to act as soon as possible. The method is also used to realize the absorption of transient energies of generators in the low-voltage fault state, thus being beneficial to the dynamic stability of the asynchronous wind generator set.
Description
Technical field
The invention belongs to technical field of wind power generation, the method that the asynchronous wind driven generator group that particularly is incorporated into the power networks is passed through low voltage failure of electric network.
Background technology
Along with the exhaustion day by day of global chemical energy source, wind power generation more and more is subject to people's attention.Though in nearly 20 years, wind turbine generator is constantly to large scale development, early stage asynchronous wind driven generator has obtained extensive use in wind energy turbine set,
Early stage wind-powered electricity generation unit capacity is less, adopt mostly simple in structure, constant speed asynchronous induction generator easily is incorporated into the power networks.Wind generator system is equipped with that soft grid-connecting apparatus is used to prevent the blower fan incision and electrical network is produced excessive impact when cutting out, and is furnished with the capacitor group and provides enough reactive power compensations for the starting and the operation of induction machine, and it is stable to keep voltage.This unit relies on advantages such as it is simple in structure, robustness good, cost is lower to occupy most of wind-power market in the blower fan early stage of development.Though this wind-powered electricity generation unit rotor-side unregulated power electronic installation, it bears overvoltage and overcurrent capability is more eager to excel in whatever one does than double-fed blower fan, but of the present inventionly studies show that when electric voltage dropping asynchronous wind driven generator produces very big transient current and impact torque, cause the unsuitable fatigue damage of rotating shaft and gear box, low voltage ride-through capability is far from reaching the desired result of people.
When low voltage failure took place, the past first was importantly protected wind turbine generator itself, allowed wind-driven generator from grid disconnection; yet; along with the increase of wind turbine generator share, consider that from the safety and stability angle a large amount of wind-powered electricity generation units has been unacceptable from grid disconnection.Electrical network has proposed new requirement to wind-electricity integration: when breaking down, the MW class wind turbine should provide certain short circuit current guaranteeing power network line protective device action message, thus the scope of dwindling the voltage collapse influence; Simultaneously, must have the ability that the opposing electric voltage dropping impacts with reference to synchronous generator, be illustrated in figure 1 as the specification requirement schematic diagram that the tentative low-voltage of State Grid Corporation of China is passed through, do not allow wind-driven generator in the a-quadrant, then allow wind-driven generator in the B zone from grid disconnection from grid disconnection.
Take all factors into consideration the fail safe of MW level asynchronous wind driven generator self and new networking rules requirement, wind turbine generator should satisfy following requirement:
1) during the electric network fault voltage collapse, wind turbine generator should be to greatest extent, provide electric current to electrical network incessantly, to guarantee the protective device action message.
2) instantaneous torque of wind-driven generator group wheel box and driving shaft must not be transshipped 200%-250%T
N, and do not allow big temporary impact torque and polarity inversion, in order to avoid gear box damages.
3) in order successfully to resist and pass through the low-voltage that all kinds of faults of electrical network cause, may need to adopt power inverter or auxiliary circuit device, but converter or auxiliary circuit installed capacity should be minimum, control is simple as far as possible, to reduce power loss and cost.
Existing low-voltage crossing technology generally can reduce four classes: a class is to adopt rotor by-pass auxiliary circuit (Crowbar Circuit); One class is the combinational circuit that rotor by-pass adds the stator side electronic power switch; One class is to improve the exciter converter control algolithm; Last class is the stator side active protective circuit.These technology apply to asynchronous wind driven generator, because its low-voltage that shows is passed through characteristic and is not quite similar, exist not enough separately.The deficiency of rotor protective circuit is: 1. the rotor protective circuit can't be taken into account the general protection of mechanical parts such as gear box, and 2. the protective circuit parameter under different faults type and the different faults degree also is difficult to unified.3. the rotor protective circuit is converted into mechanical stress with electric stress, has increased the weight of the pressure of mechanical parts such as wind-powered electricity generation unit gear box.The deficiency that rotor by-pass adds the combinational circuit of stator side electronic power switch be will be after fault 20ms realize that operation such as rapid combination has very high technical difficulty.The deficiency of stator side active protective circuit is: it also is difficult keeping the effective vector control of series transformer (SGSC) during the extreme unbalanced fault of violent temporal variations.Can find that but anatomize described four class methods all design at being incorporated into the power networks double feed wind power generator, and be not suitable for grid type asynchronous wind driven generator group.
It is believed that just the asynchronous wind driven generator group is simple in structure, rotor-side unregulated power electronic installation, it bears overvoltage and overcurrent capability is more eager to excel in whatever one does than double-fed wind power generator, so generally believe that the low voltage ride-through capability of the type wind turbine generator is strong, and be negligent of electromagnetism, the electromechanical properties of the type unit under low-voltage done deep research, therefore, have not yet to see the report that is fit to grid type asynchronous wind driven generator group low-voltage traversing method and servicing unit thereof.
Summary of the invention
The present invention is directed to above-mentioned defective and disclose the method that the asynchronous wind driven generator group that is incorporated into the power networks is passed through low voltage failure of electric network.Be divided into following steps:
1) goes here and there passive resistance network or a string passive resistance network in the lump in the lump in asynchronous wind driven generator group and electrical network serial connection two;
Wherein two go here and there in the lump that the annexation of passive resistance network is described below with single-phase equivalent circuit: be parallel with S
S1The R of by-pass switch
S1Resistance be parallel with S
S2The R of by-pass switch
S2Resistance series connection constitutes two and goes here and there the series arm of passive resistance network in the lump, R
pResistance and S
pSwitch series connection constitutes two and goes here and there the parallel branch of passive resistance network in the lump, the live wire termination S of asynchronous wind driven generator group
S1By-pass switch, R
S1Resistance and S
pThe common node of switch, the live wire termination S of electrical network
S2By-pass switch, R
S2The common node of resistance and signal deteching circuit, center line N connects asynchronous wind driven generator group, R respectively
pResistance and electrical network; ON-OFF control circuit connects signal deteching circuit and two respectively and goes here and there the switch control end of passive resistance network in the lump, and signal deteching circuit is used for the voltage of detection of grid or the electric current of power transmission line;
A string passive resistance network in the lump and two is gone here and there in the lump passive resistance network and is compared and removed S
S2By-pass switch and R
S2Resistance, electrical network live wire termination S
S1By-pass switch and R
S1The common node of resistance;
2) when electrical network normally moves, to go here and there in the lump in the passive resistance network two, ON-OFF control circuit makes S
S1By-pass switch and S
S2The by-pass switch closure makes S simultaneously
pSwitch disconnects, R
S1Resistance and R
S2Resistance is by bypass;
In a string passive resistance network in the lump, ON-OFF control circuit makes S
S1The by-pass switch closure makes S simultaneously
pSwitch disconnects, R
S1Resistance is by bypass;
3) when low voltage failure appears in electrical network, to go here and there in the lump in the passive resistance network two, ON-OFF control circuit makes S
S1By-pass switch and S
S2By-pass switch disconnects, and makes S simultaneously
pSwitch closure, R
S1Resistance and R
S2Resistance inserts between asynchronous wind driven generator group and the electrical network, and the asynchronous wind driven generator output current is forced to through R
S1Resistance and R
S2Resistance flows into electrical network again; R
pResistance is in parallel with the asynchronous wind driven generator group;
In a string passive resistance network in the lump, ON-OFF control circuit makes S
S1By-pass switch disconnects, and makes S simultaneously
pSwitch closure, R
S1Resistance inserts between asynchronous wind driven generator group and the electrical network, and the asynchronous wind driven generator output current is forced to through R
S1Resistance flows into electrical network again; R
pResistance is in parallel with the asynchronous wind driven generator group;
4) recover just often when line voltage, go here and there in the lump in the passive resistance network two, under ON-OFF control circuit control, S
S1The by-pass switch closure, ON-OFF control circuit is controlled S again behind 0.05s
S2The by-pass switch closure, R
S1Resistance and R
S2Resistance is once more by bypass, and ON-OFF control circuit makes S behind 0.2s again
pSwitch disconnects;
In a string passive resistance network in the lump, under ON-OFF control circuit control, S
S1The by-pass switch closure, ON-OFF control circuit is controlled S again behind 0.25s
pSwitch disconnects, R
S1Resistance is once more by bypass.
Described signal deteching circuit is used to detect the electric current at PCC voltage and electrical network points of common connection place.
Beneficial effect of the present invention is: adopt the method that inserts passive resistance network between asynchronous wind driven generator group and electrical network, make Large-scale Wind Turbines be passed through low voltage failure of electric network smoothly.Passive resistance network is used for the excessive short circuit current of restriction during low voltage failure; the instantaneous value of wind turbine generator voltage, stator current, rotor current, magnetic linkage and electromagnetic torque etc. is limited in the allowed band; simultaneously; to greatest extent to electrical network provide meritorious and idle and electric current supporting electrical network, and impel line protective devices to move as early as possible.Passive resistance network can also be used for absorbing the transient state energy of generator during low voltage failure, be beneficial to the dynamic stability of asynchronous wind driven generator group.
Description of drawings
Fig. 1 is the specification requirement schematic diagram that the tentative low-voltage of State Grid Corporation of China is passed through;
Fig. 2 is that the asynchronous wind driven generator group realizes the schematic diagram that low-voltage is passed through.
Fig. 3 A is one embodiment of the present of invention schematic diagram;
Fig. 3 B is an alternative embodiment of the invention schematic diagram;
The electro-magnetic transient waveform of 2 megawatt asynchronous wind driven generator groups when Fig. 4 three-phase ground short circuit fault (PCC voltage drops to 15% rated voltage, and the duration is 625ms, does not adopt the low voltage failure of electric network measure of passing through) occurs for electrical network;
The electro-magnetic transient waveform of 2 megawatt asynchronous wind driven generator groups when Fig. 5 two-phase short circuit and ground fault (PCC voltage drops to 15% rated voltage, and the duration is 625ms, does not adopt the low voltage failure of electric network measure of passing through) occurs for electrical network;
The electro-magnetic transient waveform of 2 megawatt asynchronous wind driven generator groups when Fig. 6 single-phase grounding fault (PCC voltage drops to 15% rated voltage, and the duration is 625ms, does not adopt the low voltage failure of electric network measure of passing through) occurs for electrical network;
The electro-magnetic transient waveform of 2 megawatt asynchronous wind driven generator groups when Fig. 7 phase fault (PCC voltage drops to 15% rated voltage, and the duration is 625ms, does not adopt the low voltage failure of electric network measure of passing through) occurs for electrical network;
The electro-magnetic transient waveform of 2 megawatt asynchronous wind driven generator groups when Fig. 8 three-phase ground short circuit fault (PCC voltage drops to 15% rated voltage, and the duration is 625ms, adopts the method for passing through low voltage failure of electric network) occurs for electrical network;
The electro-magnetic transient waveform of 2 megawatt asynchronous wind driven generator groups when Fig. 9 two-phase short circuit and ground fault (PCC voltage drops to 15% rated voltage, and the duration is 625ms, adopts the method for passing through low voltage failure of electric network) occurs for electrical network;
The electro-magnetic transient waveform of 2 megawatt asynchronous wind driven generator groups when Figure 10 single-phase grounding fault (PCC voltage drops to 15% rated voltage, and the duration is 625ms, adopts the method for passing through low voltage failure of electric network) occurs for electrical network;
The electro-magnetic transient waveform of 2 megawatt asynchronous wind driven generator groups when Figure 11 phase fault (PCC voltage drops to 15% rated voltage, and the duration is 625ms, adopts the method for passing through low voltage failure of electric network) occurs for electrical network;
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Being illustrated in figure 2 as the asynchronous wind driven generator group adopts two to go here and there in the lump the passive resistance buffer and realize the schematic diagram that low-voltage is passed through.Slurry windmill 1, gear box 2 and asynchronous wind driven generator group 3 are electric energy with wind energy transformation, and passive resistance buffer, transformer 3, transmission line and electrical network 5 are connected in series successively, and it is linear setting transformer, does not promptly consider the magnetic saturation situation of transformer.Capacitor group 6 connects asynchronous wind driven generator group 3, is used for reactive power compensation, guarantees that the asynchronous wind driven generator group inserts the power factor of electrical network more than 98%.The passive resistance buffer is made up of two series resistances and a parallel resistance of reverse-blocking tetrode thyristor control; Series resistance and parallel resistance do not drop into when stable state, and promptly series resistance is by short circuit, and parallel resistance is opened a way.When electric network fault,, insert series resistance and parallel resistance by switch motion.Series resistance has three effects: the first, when electric voltage dropping, keep and being connected of electrical network; The second, when electric network fault, provide meritorious, idle and electric current to electrical network, support electrical network to greatest extent; The 3rd, guarantee that when short circuit malfunction stator current is limited in the twice of rated value.The main effect of parallel resistance is the power of balance wind-driven generator when electric network fault.
Embodiment one: as shown in Figure 3A, the method that the asynchronous wind driven generator group that is incorporated into the power networks is passed through low voltage failure of electric network is divided into following steps:
1) goes here and there passive resistance network in the lump in asynchronous wind driven generator group and electrical network serial connection two; Its annexation is described below with single-phase equivalent circuit: be parallel with S
S1The R of by-pass switch
S1Resistance be parallel with S
S2The R of by-pass switch
S2Resistance series connection constitutes two and goes here and there the series arm of passive resistance network in the lump, R
pResistance and S
pSwitch series connection constitutes two and goes here and there the parallel branch of passive resistance network in the lump, the live wire termination S of asynchronous wind driven generator group
S1By-pass switch, R
S1Resistance and S
pThe common node of switch, the live wire termination S of electrical network
S2By-pass switch, R
S2The common node of resistance and signal deteching circuit, center line N connects asynchronous wind driven generator group, R respectively
pResistance and electrical network; ON-OFF control circuit connects signal deteching circuit and two respectively and goes here and there the switch control end of passive resistance network in the lump, and signal deteching circuit is used for the voltage of detection of grid or the electric current of power transmission line;
2) when electrical network normally moved, ON-OFF control circuit made S
S1By-pass switch and S
S2The by-pass switch closure makes S simultaneously
pSwitch disconnects, R
S1Resistance and R
S2Resistance is not influenced the normal operation of wind generator system by bypass;
3) when low voltage failure appears in electrical network, ON-OFF control circuit makes S
S1By-pass switch and S
S2By-pass switch disconnects, R
S1Resistance and R
S2Resistance inserts between asynchronous wind driven generator group and the electrical network, and the asynchronous wind driven generator output current is forced to through R
S1Resistance and R
S2Resistance flows into electrical network, R again
S1Resistance and R
S2Resistance at first provides active power, reactive power and electric current to the electric network fault point, to quicken and to guarantee that line protective devices move quickly and accurately; Secondly, R
S1Resistance and R
S2Resistance will slow down the acute variation of asynchronous wind driven generator group stator and rotor electric current, electromagnetic torque effectively, stator current, rotor current and electromagnetic torque restriction is as follows: stator current, rotor current are less than 2 times rated current, the transient electromagnetic torque must not be transshipped 200%-250%TN, does not have big temporary impact torque and polarity inversion.At last, R
S1Resistance and R
S2Resistance will partially absorb the transient state energy of generator, to help stablizing of asynchronous wind driven generator group.
At S
S1By-pass switch and S
S2When by-pass switch disconnected, ON-OFF control circuit made S
pSwitch closure, R
pResistance is in parallel to insert between asynchronous wind driven generator group and the electrical network R
pResistance absorbs the transient state energy of generator, the meritorious and reactive power of balance asynchronous wind driven generator group input, the transient stability of enhancing asynchronous wind driven generator group.
In sum, R
pResistance, R
S1Resistance and R
S2Resistance limits short-circuit impact electric current suppresses electromagnetic torque and impacts, and raises asynchronous wind driven generator voltage;
4) signal deteching circuit is after detecting the voltage recovery, and ON-OFF control circuit makes S
S1The by-pass switch closure, the by-pass switch control circuit is controlled S again behind 0.05s
S2The by-pass switch closure, R
S1Resistance and R
S2Resistance is once more by bypass, and ON-OFF control circuit makes S behind 0.2s
pSwitch disconnects.Switch series and parallel resistance by classification, timesharing, reduce its state and change the transient current that causes and the impact of torque.
Embodiment two: shown in Fig. 3 B, insert a string passive resistance network in the lump in asynchronous wind driven generator group and electrical network, its annexation is as follows: compare with Fig. 3 A, removed S
S2By-pass switch and R
S2Resistance, electrical network live wire termination S
S1By-pass switch and R
S1The common node of resistance;
When electrical network normally moved, ON-OFF control circuit made S
S1The by-pass switch closure makes S simultaneously
pSwitch disconnects, R
S1Resistance is by bypass;
When low voltage failure appearred in electrical network, ON-OFF control circuit made S
S1By-pass switch disconnects, and makes S simultaneously
pSwitch closure, R
S1Resistance inserts between asynchronous wind driven generator group and the electrical network, and the asynchronous wind driven generator output current is forced to through R
S1Resistance flows into electrical network again; R
pResistance is in parallel with the asynchronous wind driven generator group;
When line voltage recovers just often, under ON-OFF control circuit control, S
S1The by-pass switch closure, ON-OFF control circuit is controlled S again behind 0.25s
pSwitch disconnects, R
S1Resistance is once more by bypass.
When PCC voltage is lower than 80% or set point of rated value, S
S1By-pass switch, S
S2By-pass switch disconnects when having detected the electric voltage dropping signal, electric network fault disappear or be eliminated, that voltage recovers the back is closed; S
pSwitch is closure when electric voltage dropping, and voltage recovers the back and disconnects.R
S1Resistance, R
S2Resistance and R
pResistance is inoperative under steady operational status.
Typical asynchronous wind turbine generator with one 2 megawatt is an example below, and the low-voltage that the research electric network fault causes is to the influence of asynchronous wind driven generator group.
As Fig. 4-Figure 7 shows that the electro-magnetic transient waveform of four kinds of typical faults appears in 2 megawatt asynchronous wind driven generator groups when not taking low-voltage to pass through measure, the electro-magnetic transient waveform comprises stator voltage, stator current, electromagnetic torque, meritorious transient state waveform and idle transient state waveform, 2 megawatt asynchronous wind driven generator groups break down when 6s, finish fault at 6.625s, can see: in electrical network breaks down the process that voltage subsides and voltage recovers, if do not take low-voltage to pass through measure, the asynchronous wind driven generator electromagnetic torque will acute variation, transient peaks can reach 2 to 5 times of nominal torques, and, also be attended by the thermal agitation of electromagnetic torque, torque polarity repeats counter-rotating, the change gear box of serious harm asynchronous wind driven generator group and the safety of macro-axis.
On the one hand, the PCC low-voltage that causes of electric network fault has caused huge impact to the asynchronous wind driven generator group; On the other hand, along with the increase of asynchronous wind driven generator component volume, and wind energy turbine set directly inserts big electrical network, and a large amount of wind-powered electricity generation units also will jeopardize the safety and stability of electrical network during fault from grid disconnection.
As Fig. 8～shown in Figure 11, the method that 2 megawatt asynchronous wind driven generator groups have adopted the asynchronous wind driven generator group that is incorporated into the power networks of the present invention to pass through low voltage failure of electric network, wherein, the electro-magnetic transient waveform comprises stator voltage, stator current, electromagnetic torque, meritorious transient state waveform and idle transient state waveform, 2 megawatt asynchronous wind driven generator groups break down when 6s, 6.625s end fault, can see equally: 1) between age at failure, access two is gone here and there in the lump, and passive resistance network has slowed down asynchronous wind driven generator group electric current effectively, the acute variation of electromagnetic torque, the stator current instantaneous value is less than 2 times of current ratings.2) in the process that voltage subsides and voltage recovers, the instantaneous torque of gear box and driving shaft is less than 200%T
N, and do not have big temporary impact torque burr and polarity inversion, avoid gear box to damage.3) between age at failure, stator current is limited in 2 times of rated value scopes, but in short-term greater than the stator current rated value, this helps during electric network fault, and wind turbine generator provides electric current to electrical network incessantly, to guarantee the protective device action message.
Claims (2)
1. the asynchronous wind driven generator group that is incorporated into the power networks is passed through the method for low voltage failure of electric network, it is characterized in that, is divided into following steps:
1) goes here and there passive resistance network or a string passive resistance network in the lump in the lump in asynchronous wind driven generator group and electrical network serial connection two;
Wherein two go here and there in the lump that the annexation of passive resistance network is described below with single-phase equivalent circuit: be parallel with S
S1The R of by-pass switch
S1Resistance be parallel with S
S2The R of by-pass switch
S2Resistance series connection constitutes two and goes here and there the series arm of passive resistance network in the lump, R
pResistance and S
pSwitch series connection constitutes two and goes here and there the parallel branch of passive resistance network in the lump, the live wire termination S of asynchronous wind driven generator group
S1By-pass switch, R
S1Resistance and S
pThe common node of switch, the live wire termination S of electrical network
S2By-pass switch, R
S2The common node of resistance and signal deteching circuit, center line N connects asynchronous wind driven generator group, R respectively
pResistance and electrical network; ON-OFF control circuit connects signal deteching circuit and two respectively and goes here and there the switch control end of passive resistance network in the lump, and signal deteching circuit is used for the voltage of detection of grid or the electric current of power transmission line;
A string passive resistance network in the lump and two is gone here and there in the lump passive resistance network and is compared and removed S
S2By-pass switch and R
S2Resistance, electrical network live wire termination S
S1By-pass switch and R
S1The common node of resistance;
2) when electrical network normally moves, to go here and there in the lump in the passive resistance network two, ON-OFF control circuit makes S
S1By-pass switch and S
S2The by-pass switch closure makes S simultaneously
pSwitch disconnects, R
S1Resistance and R
S2Resistance is by bypass;
In a string passive resistance network in the lump, ON-OFF control circuit makes S
S1The by-pass switch closure makes S simultaneously
pSwitch disconnects, R
S1Resistance is by bypass;
3) when low voltage failure appears in electrical network, to go here and there in the lump in the passive resistance network two, ON-OFF control circuit makes S
S1By-pass switch and S
S2By-pass switch disconnects, and makes S simultaneously
pSwitch closure, R
S1Resistance and R
S2Resistance inserts between asynchronous wind driven generator group and the electrical network, and the asynchronous wind driven generator output current is forced to through R
S1Resistance and R
S2Resistance flows into electrical network again; R
pResistance is in parallel with the asynchronous wind driven generator group;
In a string passive resistance network in the lump, ON-OFF control circuit makes S
S1By-pass switch disconnects, and makes S simultaneously
pSwitch closure, R
S1Resistance inserts between asynchronous wind driven generator group and the electrical network, and the asynchronous wind driven generator output current is forced to through R
S1Resistance flows into electrical network again; R
pResistance is in parallel with the asynchronous wind driven generator group;
4) recover just often when line voltage, go here and there in the lump in the passive resistance network two, under ON-OFF control circuit control, S
S1The by-pass switch closure, ON-OFF control circuit is controlled S again behind 0.05s
S2The by-pass switch closure, R
S1Resistance and R
S2Resistance is once more by bypass, and ON-OFF control circuit makes S behind 0.2s again
pSwitch disconnects;
In a string passive resistance network in the lump, under ON-OFF control circuit control, S
S1The by-pass switch closure, ON-OFF control circuit is controlled S again behind 0.25s
pSwitch disconnects, R
S1Resistance is once more by bypass.
2. the method that the asynchronous wind driven generator group that is incorporated into the power networks according to claim 1 is passed through low voltage failure of electric network is characterized in that, described signal deteching circuit is used to detect the electric current at PCC voltage and electrical network points of common connection place.
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| CN103986166A (en) * | 2014-05-30 | 2014-08-13 | 哈尔滨工业大学 | Wind-power-plant network voltage fault protection device and method suitable for wide power factor range |
| CN105958457A (en) * | 2016-06-01 | 2016-09-21 | 国网河北省电力公司电力科学研究院 | Distributed overvoltage protection system for movable type photovoltaic power station low voltage ride-through testing apparatus |
| CN111373620A (en) * | 2017-12-20 | 2020-07-03 | 维斯塔斯风力系统集团公司 | Repetitive fault protection for wind power plants |
| US20200274361A1 (en) * | 2017-08-30 | 2020-08-27 | Siemens Aktiengesellschaft | Frequency stabilization arrangement |
| CN116317742A (en) * | 2023-05-16 | 2023-06-23 | 北京金风科创风电设备有限公司 | Torque control device of wind generating set, wind generating set and control method |
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| CN101499664A (en) * | 2008-02-03 | 2009-08-05 | 北京能高自动化技术有限公司 | Low voltage traversing control method for wind power generation set grid-connection current transformer |
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