CN105048497A - Doubly-fed wind turbine generator low-voltage ride through method - Google Patents
Doubly-fed wind turbine generator low-voltage ride through method Download PDFInfo
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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
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Abstract
The invention relates to a doubly-fed wind turbine generator low-voltage ride through method. According to the invention, DC bus voltage is detected at real time. When DC bus voltage is greater than or equal to trigger voltage Uchopper of a chopper circuit, a switching device in the chopper circuit is controlled to be switched on, and energy release is carried out through a loading shielding resistor. In the specification, UGp_d is network voltage positive-sequence d-component, UN is rated network voltage, X is a set voltage threshold value, and A and B are set proportionality coefficients which are both greater than 1. Uchopper is not a fixed value but is divided into two parts: one part is a constant value; and the other part is in direct proportion to the rated network voltage. When the rated network voltage becomes larger, trigger threshold of the chopper circuit is increased. Then, unnecessary energy release is prevented to some extent, and electric energy is saved. In addition, effective trigger of the chopper circuit also can be guaranteed, and damage to the switching device in a current transformer is avoided.
Description
Technical field
The present invention relates to a kind of Double-feed wind power unit high voltage crossing method, belong to the technical field of power generation of Double-feed wind power unit.
Background technology
21 century, along with the exhaustion day by day of the conventional fossil energy in countries in the world and the increasingly serious of energy-saving and emission-reduction situation, green regenerative energy sources and environment-friendly type low-carbon economy more and more come into one's own, and wind power generation obtains fast development.At present, domestic wind-powered electricity generation installation total amount occupy the first in the world, and the impact of Wind Power Generation on Power System causes enough attention.
Short circuit malfunction can cause falling of wind farm grid-connected point voltage, in low voltage crossing process, wind energy turbine set often adopts reactive power compensators such as dropping into FC, SVC, SVG, because existing reactive power compensator control precision causes idle surplus compared with missionary society, cause further producing overvoltage phenomenon during voltage resume.Electric network fault can bring a series of transient process to wind energy turbine set electric equipments such as Wind turbines, as overcurrent, low-voltage, overruns.If large-scale wind power unit, at electric network fault moment disorderly closedown, just can not support line voltage, and then causes chain reaction from grid disconnection, the stable operation of electrical network is caused to having a strong impact on.
Therefore, in order to maintain the safe and stable operation of electrical network, electrical network department of various countries proposes strict technical requirement according to the electric power access of self reality to wind energy turbine set, wherein the fault ride-through capacity of blower fan requires that (GridFaultRideThrough, GFRT) is acknowledged as the challenging important technical requirement of most.GFRT (comprising LVRT and HVRT) concept is commonplace abroad, although various countries' call is different with classification, but the definition of each national standard to Wind turbines GFRT ability is basically identical, its substance can be summarized as: when power system accident or disturbance cause grid-connected point voltage or frequency to exceed the normal operation range of standard permission, within certain voltage or frequency range and duration time interval thereof, according to standard-required, Wind turbines can ensure that off-grid does not run continuously, and smooth transition is to a kind of ability of normal operating condition.Current domestic low-voltage crossing has carried out clear stipulaties in " GBT_19963-2011 wind energy turbine set access power system technology regulation ", but does not also have the specific standards of HVRT.Domestic north, Ji DianKeYuan proposes some HVRT standards, and in 2014, has done HVRT test job first for total power unit and double-fed unit, but just case test, do not become industry standard.Its peak demand is unit access point voltage swells 1.3 times of nominal value 200ms, and unit not off-grid normally runs.
When after grid collapses, may cause damaging current transformer and Wind turbines, also may produce power rush to electrical network simultaneously, cause the transient state of electric power system unstable, even may cause local or systemic breakdown time serious, in harm electrical network, other equipment cause more serious loss.Therefore, when electric network fault or disturbance cause the voltage instability timing of wind farm grid-connected point, Wind turbines can continually be incorporated into the power networks for the stable important in inhibiting maintaining electrical network.The net side of double-fed wind energy converter is directly connected with electrical network, and when line voltage rises sharply, grid side power cannot be sent; power flows into current transformer by grid side; cause DC bus-bar voltage to raise fast, cause the system failure to be shut down, may because overvoltage damages power device IGBT under serious conditions.
Chinese Patent Application No. is disclose a kind of Double-feed wind power unit high voltage crossing control method and high voltage crossing system thereof in the patent application document of 201310102599; when adopting DC bus chopper circuit to carry out dynamic adjustments; current transformer is by detecting DC bus-bar voltage in real time; when DC bus-bar voltage is increased to the trigger voltage of chopper circuit; then open the switching device in chopper circuit; fallen by the fault offset of drain charge resistance by rotor feed-in, maintain busbar voltage and be no more than protection voltage.But the control criterion in this control method is more fixing, in reality judges, because the line voltage moment can change, utilize this criterion to carry out energy when releasing, following two kinds of situations may be had: released when 1, should not release by mistake, 2, this or not when releasing.The first situation is that meaningless energy is released, and cause the waste of energy, the second situation may damage the switching device in current transformer.
Summary of the invention
The object of this invention is to provide a kind of Double-feed wind power unit high voltage crossing method, carry out energy in order to the employing DC bus chopper circuit solved in existing traversing method and release and meaningless energy may be caused to release or damage the problem of switching device.
For achieving the above object, the solution of the present invention comprises a kind of Double-feed wind power unit high voltage crossing method, DC bus is connected with direct current chopper circuit, detects DC bus-bar voltage in real time, when DC bus-bar voltage is greater than or equal to the trigger voltage U of chopper circuit
choppertime, then the switch device conductive in control chopper circuit, carries out fault offset by drain charge resistance;
Wherein,
u
gp_dfor line voltage positive sequence d axle component, U
nfor specified line voltage, X is the voltage threshold of a setting, A and B be setting be greater than 1 proportionality coefficient.
The outlet line of current transformer pusher side rotor is connected with rotor-side crowbar circuit, and when current transformer pusher side rotor current is greater than or equal to an overcurrent threshold value, input rotor side crowbar circuit, carries out energy and releases.
After the crowbar circuit of described input rotor side, when described current transformer pusher side rotor current is reduced to the time of a controllable current threshold value or described crowbar circuit input more than a setting-up time threshold value, and DC bus-bar voltage below rated value time, excise described crowbar circuit.
When line voltage is greater than or equal to the setting multiple of its rated voltage, pusher side current transformer and its control impuls of net side converter locking; When line voltage is less than the setting multiple of its rated voltage described and DC bus-bar voltage is less than described U
choppertime, unlock the control impuls of described pusher side current transformer and net side converter.
Described X is 1180V, and described A is
b is 1.21, U
nfor 690V.
The outlet line of described current transformer pusher side rotor is also connected with filter, and the interchange end of described interchange crowbar circuit is connected between filter and pusher side current transformer.
Described interchange crowbar circuit comprises rectification circuit, filter capacitor and branch road of releasing, what the interchange end of described rectification circuit was connected to described filter and pusher side current transformer exchanges on the connection line of end, and described filter capacitor and described branch road of releasing are connected to the DC terminal of rectification circuit; Described branch road of releasing is serially connected with bleeder resistance and switch element, and described bleeder resistance is in parallel with a fly-wheel diode, and described switch element is in parallel with a buffer circuit, and described buffer circuit is RCD buffer circuit.
Described switch element is IGBT.
In high voltage crossing method provided by the invention, the trigger voltage of direct current chopper circuit is not a fixed value, trigger voltage is divided into two parts by the change according to the relation between the positive sequence component of line voltage and specified line voltage, a part is a definite value, another part and specified line voltage proportional, so, when specified line voltage becomes large, the trigger voltage of the direct current chopper circuit of its correspondence also correspondingly increases, namely increase the triggering door of this chopper circuit, prevent to some extent is that meaningless energy is released, save electric energy, and also can ensure effective triggering of chopper circuit simultaneously, avoid the switching device damaged in current transformer.
Accompanying drawing explanation
Fig. 1 is Double-feed wind power unit high voltage crossing system configuration schematic diagram;
Fig. 2 is the circuit diagram exchanging crowbar;
Fig. 3 is the logic diagram of releasing of direct current chopper circuit;
Fig. 4 is the logic diagram of releasing exchanging crowbar circuit.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Be illustrated in figure 1 a kind of Double-feed wind power unit high voltage crossing system configuration diagram, this system is provided with the dual power circuitry of rotor-side and DC side, DC side power circuitry is DC bus chopper circuit, be attempted by DC bus, this circuit is made up of (or multiple) bleeder resistance and (or multiple) switching device, switching device reverse parallel connection diode component, bleeder resistance in the present embodiment, switching device and diode component are one, and switching device adopts IGBT.Rotor-side power circuitry is rotor-side crowbar circuit, the wiring position of this crowbar circuit is between pusher side current transformer and du/dt filter, such setting effectively can reduce the voltage that the IGBT two ends in crowbar circuit are born, i.e. voltage Vce, guarantee the safety of the relevant components device between age at failure in crowbar circuit, especially can effectively prevent IGBT from damaging.During steady operation, exchanging the voltage Vce born at the IGBT two ends in crowbar circuit is 1130V; During electric network fault, the maximum of Vce voltage is 1350V.
As shown in Figure 2, this crowbar circuit comprises rectification circuit, the interchange end of rectification circuit is connected on the three-phase AC line between pusher side current transformer and du/dt filter, is connected with resistance R1, electric capacity C1 and releases branch road between two DC buss of crowbar circuit.This branch road of releasing is serially connected with bleeder resistance R3 and IGBT, and bleeder resistance R3 is in parallel with sustained diode 3, and the two ends of IGBT are parallel with a buffer circuit, and this buffer circuit is RCD buffer circuit.
In high voltage crossing method provided by the invention, the triggering basis for estimation U in direct current chopper circuit
chopperin, add the judgement to line voltage positive sequence component, be specially:
Wherein, U
gp_dfor line voltage positive sequence d axle component, U
nfor specified line voltage (690V).U
chopperaccording to U
gp_dthe condition met is determined.
When carrying out high voltage crossing, detect DC bus-bar voltage in real time, when DC bus-bar voltage is greater than or equal to the trigger voltage U of chopper circuit
choppertime, then the IGBT conducting in control chopper circuit, electric current flows through from drain charge resistance, carries out fault offset by drain charge resistance, drops into the flow process of chopper circuit as shown in Figure 3.
When under line voltage abnormal conditions, current transformer pusher side rotor (namely current transformer pusher side rotor is the rotor of generator) electric current increases to when being greater than or equal to pusher side overcurrent threshold value or when DC bus-bar voltage is too high, input rotor side crowbar circuit, carries out energy and releases; Carry out after energy releases at this crowbar circuit of input, rotor current reduces gradually, when current transformer pusher side rotor current be reduced to controllable current threshold value (generally getting the rated current of 0.8 times) below or this crowbar circuit drop into time more than one setting limiting time, and DC bus-bar voltage below rated value time, excise this crowbar circuit, drop into and excise the flow process of crowbar circuit as shown in Figure 4.
When line voltage exceedes the controlled range of its current transformer, fall as degree of depth imbalance or line voltage is greater than or equal to 1.2 times of rated voltage time, pusher side current transformer and net side converter control impuls adopt closedown mode, realize fault traversing; When line voltage is replied normal, be namely less than 1.2 times of rated voltage and DC bus-bar voltage drops to U
choppertime following, unlock the control impuls of pusher side current transformer and net side converter.The control impuls of breech-block side converter and net side converter can realize not off-grid and run under the asymmetric degree of depth of electrical network falls (degree of unbalance is greater than 0.4), the harsh conditions such as rated voltage of more than 1.2 times.
In low high pressure crossing process, given value of current is so that " net side is meritorious preferential, and pusher side is preferentially idle; Net side is supported for auxiliary, and pusher side is supported for master " be principle.
The preferential active power of output of net side converter, to guarantee that DC bus-bar voltage is stablized, according to current active current value and load current value, calculate reactive current support value, its formula is:
Wherein I
g_qfor the given calculating of reactive current, I
g_Nfor net side rated current, I
g_dfor net side active current set-point, namely outer voltage output valve.
Pusher side current transformer according to related request, computer-side excitation axle referenced reactive current, and according to current reactive power and rated current, carry out amplitude limit to torque current is given.
The given computing formula of pusher side current transformer reactive current is as follows:
Wherein I
tfor needing the reactive current value compensated according to standard " GBT_19963-2011 wind energy turbine set access power system technology specifies ", U
tfor the positive sequence D axle component that electrical network drops into, I
nfor unit rated current, I
m_qfor pusher side reactive current set-point, L
sfor generator unit stator inductance value, L
mfor generator excitation inductance value, N
rsfor generator turns the stator turn ratio.
The given computing formula of pusher side current transformer torque current is:
wherein I
m_dfor the given calculating of pusher side torque current, I
m_Nfor pusher side rated current.
Because passing through reactive power support requirement without high pressure temporarily, carrying out high pressure by above formula temporarily and passing through lower reactive power support Current calculation.
A kind of concrete structure exchanging crowbar circuit is provided in above-described embodiment, certainly, the concrete structure of the interchange crowbar circuit provided in above-described embodiment is not limited in high voltage crossing system in the present invention, it can also use the crowbar circuit of other structures, such as, the structure of crowbar circuit disclosed in the patent documentation provided in background technology.
In above-described embodiment, switch element is IGBT, and as other embodiment, switch element can also be the wholly-controled device of other types.
In above-described embodiment,
in coefficient be respectively: to be 1180V, A be X
b is 1.21, U
nfor 690V, certainly, each coefficient is not limited to the restriction of the present embodiment, and its concrete value sets as the case may be, and wherein A and B will meet and be greater than 1.
Be presented above concrete execution mode, but the present invention is not limited to described execution mode.Basic ideas of the present invention are above-mentioned basic scheme, and for those of ordinary skill in the art, according to instruction of the present invention, designing the model of various distortion, formula, parameter does not need to spend creative work.The change carried out execution mode without departing from the principles and spirit of the present invention, amendment, replacement and modification still fall within the scope of protection of the present invention.
Claims (8)
1. a Double-feed wind power unit high voltage crossing method, DC bus is connected with direct current chopper circuit, it is characterized in that, detect DC bus-bar voltage in real time, when DC bus-bar voltage is greater than or equal to the trigger voltage U of chopper circuit
choppertime, then the switch device conductive in control chopper circuit, carries out fault offset by drain charge resistance;
Wherein,
u
gp_dfor line voltage positive sequence d axle component, U
nfor specified line voltage, X is the voltage threshold of a setting, A and B be setting be greater than 1 proportionality coefficient.
2. Double-feed wind power unit high voltage crossing method according to claim 1, it is characterized in that, the outlet line of current transformer pusher side rotor is connected with rotor-side crowbar circuit, when current transformer pusher side rotor current is greater than or equal to an overcurrent threshold value, input rotor side crowbar circuit, carries out energy and releases.
3. Double-feed wind power unit high voltage crossing method according to claim 2, it is characterized in that, after the crowbar circuit of described input rotor side, when described current transformer pusher side rotor current is reduced to the time of a controllable current threshold value or described crowbar circuit input more than a setting-up time threshold value, and DC bus-bar voltage below rated value time, excise described crowbar circuit.
4. Double-feed wind power unit high voltage crossing method according to claim 1, is characterized in that, when line voltage is greater than or equal to the setting multiple of its rated voltage, and pusher side current transformer and its control impuls of net side converter locking; When line voltage is less than the setting multiple of its rated voltage described and DC bus-bar voltage is less than described U
choppertime, unlock the control impuls of described pusher side current transformer and net side converter.
5. Double-feed wind power unit high voltage crossing method according to claim 1, it is characterized in that, described X is 1180V, and described A is
b is 1.21, U
nfor 690V.
6. Double-feed wind power unit high voltage crossing method according to claim 2, it is characterized in that, the outlet line of described current transformer pusher side rotor is also connected with filter, and the interchange end of described interchange crowbar circuit is connected between filter and pusher side current transformer.
7. Double-feed wind power unit high voltage crossing method according to claim 6, it is characterized in that, described interchange crowbar circuit comprises rectification circuit, filter capacitor and branch road of releasing, what the interchange end of described rectification circuit was connected to described filter and pusher side current transformer exchanges on the connection line of end, and described filter capacitor and described branch road of releasing are connected to the DC terminal of rectification circuit; Described branch road of releasing is serially connected with bleeder resistance and switch element, and described bleeder resistance is in parallel with a fly-wheel diode, and described switch element is in parallel with a buffer circuit, and described buffer circuit is RCD buffer circuit.
8. Double-feed wind power unit high voltage crossing method according to claim 7, it is characterized in that, described switch element is IGBT.
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| CN105406501A (en) * | 2015-12-21 | 2016-03-16 | Abb技术有限公司 | Rectifier station, high-voltage direct-current power transmission system and fault eliminating method |
| CN106451555A (en) * | 2016-11-22 | 2017-02-22 | 南方电网科学研究院有限责任公司 | Low-voltage ride through control method and system of doubly-fed wind turbine |
| CN107196338A (en) * | 2017-06-30 | 2017-09-22 | 天津大学 | A kind of double-fed blower fan low-voltage ride-through method of dynamic adjustment rotor crow bar resistance |
| CN111509767A (en) * | 2020-03-17 | 2020-08-07 | 科诺伟业风能设备（北京）有限公司 | High voltage ride through control method for wind power double-fed converter |
| CN111884256A (en) * | 2020-07-31 | 2020-11-03 | 国网经济技术研究院有限公司 | High voltage ride through method and system for new energy unit |
| WO2023272976A1 (en) * | 2021-06-29 | 2023-01-05 | 新疆金风科技股份有限公司 | High voltage ride through device and method, wind power converter, and wind turbine set |
| CN116093904A (en) * | 2023-04-10 | 2023-05-09 | 三峡智控科技有限公司 | DC bus overvoltage protection circuit and element parameter configuration method |
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| CN111509767A (en) * | 2020-03-17 | 2020-08-07 | 科诺伟业风能设备（北京）有限公司 | High voltage ride through control method for wind power double-fed converter |
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| CN116093904A (en) * | 2023-04-10 | 2023-05-09 | 三峡智控科技有限公司 | DC bus overvoltage protection circuit and element parameter configuration method |
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