CN102121966B - Measuring method and analytical system for low-voltage ride through capability of wind driven generator - Google Patents
Measuring method and analytical system for low-voltage ride through capability of wind driven generator Download PDFInfo
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Abstract
本发明公开了一种在仿真系统中风力发电机低电压穿越能力的测量方法和分析系统，所述方法包括：向风力发电机的并网点输入小于标准电压值的测量电压；测量风力发电机从输入测试电压到风力发电机脱网为止的保持并网时间；如果保持并网时间小于预设的阈值时间，则调整风力发电机的撬棒保护电路的投切时间和/或撬棒保护电路的旁路电阻值，以及风力发电机的低电压保护定值，使保持并网时间大于等于阈值时间。本发明的风力发电机低电压穿越能力的测量方法和系统，可以为风力发电机选择合适的撬棒保护电路的投切时间和撬棒保护电路的旁路电阻值以及风力发电机的低电压保护定值，由此使得风力发电机具备合适的低电压穿越能力，保护电网的安全。
The invention discloses a measurement method and an analysis system for the low voltage ride-through capability of a wind power generator in a simulation system. The grid-connected time between the input test voltage and the wind turbine off-grid; if the grid-connected time is less than the preset threshold time, adjust the switching time of the crowbar protection circuit of the wind turbine and/or the crowbar protection circuit The value of the bypass resistance and the low voltage protection setting of the wind turbine make the grid-connected time greater than or equal to the threshold time. The method and system for measuring the low voltage ride-through capability of the wind power generator of the present invention can select the appropriate switching time of the crowbar protection circuit, the bypass resistance value of the crowbar protection circuit and the low voltage protection of the wind power generator for the wind power generator. Fixed value, so that the wind turbine has a suitable low-voltage ride-through capability to protect the safety of the power grid.
Description
Technical field
The present invention relates to measuring method and system that the maintenance of aerogenerator low-voltage is incorporated into the power networks, relate in particular to a kind of measuring method and analytic system of voltage ride through capability of wind driven generator.
Background technology
Along with the development in epoch, wind-power electricity generation is increasing as clean energy resource shared ratio in electric power energy, and what cause thus is that wind generator system can not be ignored the impact of grid stability.Existing wind generator system is when line voltage is reduced to certain value, just the automatic off-grid of wind power generating set, if be acceptable in the not high electrical network of wind-powered electricity generation proportion.But for the electric system of wind-powered electricity generation installation large percentage, wind power generating set may cause the collapse of line voltage and frequency from net.Therefore, along with the rapid increase of wind-power electricity generation amount, the automatic off-grid of wind power generating set no longer is suitable for the operation criterion of new electrical network.Therefore must be so that wind power generating set still can keep being incorporated into the power networks when falling in line voltage moment, namely wind power generating set has certain low voltage crossing service ability.
Low voltage crossing just refers to be incorporated into the power networks point voltage when falling at blower fan, and blower fan can keep being incorporated into the power networks, even provides certain reactive power to electrical network, supports power system restoration, until power system restoration is normal.That the blower fan that is incorporated into the power networks is still kept a kind of specific operation function requirement of being incorporated into the power networks when electrical network voltage occurs and falls.
Research wind energy turbine set low voltage ride-through capability arranges closely related on the impact of electrical network and the protection of wind energy turbine set.Because the double-fed induction wind turbine possesses low voltage ride-through capability, off-grid not under failure condition is so provide certain short-circuit current between age at failure.Present wind energy turbine set is sent the route protection definite value and is arranged wind energy turbine set is used as one-end substation setting, when the relay protection configuration is adjusted, does not consider that wind-powered electricity generation is on the impact of short-circuit current.When the wind energy turbine set capacity acquires a certain degree; the short-circuit current that wind energy turbine set provides just may surpass the short-circuit current that system side provides; this moment, the protection of configuration crow bar was coordinated in the impact of blower fan low voltage crossing in the time of must considering fault when being correlated with relay protection fixed value setting.
The measuring method that does not have voltage ride through capability of wind driven generator in the prior art; can't select the switching time of the suitable crow bar holding circuit that requires and the bypass resistance value of crow bar holding circuit to aerogenerator; can't measure transient characterisitics and the short-circuit current characteristic of double-fed wind power generator under electric network fault, can not accurately study affects grid stability after it networks on a large scale.
Summary of the invention
The objective of the invention is the defective for prior art; a kind of measuring method and analytic system of voltage ride through capability of wind driven generator are provided; can select the switching time of suitable crow bar holding circuit and the bypass resistance value of crow bar holding circuit for aerogenerator; and the under-voltage protection definite value of aerogenerator; so that aerogenerator possesses suitable low voltage ride-through capability, protect the safety of electrical network thus.
For achieving the above object, the invention provides a kind of measuring method of voltage ride through capability of wind driven generator, described method comprises:
The also site input of direction wind-driven generator is less than the measuring voltage of standard voltage value;
Measuring the maintenance of described aerogenerator till from input test voltage to described aerogenerator off-grid is incorporated into the power networks the time;
Time is less than default threshold time if described maintenance is incorporated into the power networks; then adjust switching time of crow bar holding circuit of described aerogenerator and/or the bypass resistance value of described crow bar holding circuit; and the under-voltage protection definite value of aerogenerator, make described maintenance be incorporated into the power networks the time more than or equal to described threshold time.
For achieving the above object, the invention provides a kind of analytic system of voltage ride through capability of wind driven generator, described system comprises:
Input block is used for the also site input of direction wind-driven generator less than the measuring voltage of standard voltage value;
Measuring unit is used for measuring the maintenance of described aerogenerator till from input test voltage to described aerogenerator off-grid and is incorporated into the power networks the time;
Adjustment unit; be incorporated into the power networks the time less than default threshold time if be used for described maintenance; then adjust switching time of crow bar holding circuit of described aerogenerator and/or the bypass resistance value of described crow bar holding circuit; and the under-voltage protection definite value of aerogenerator, make described maintenance be incorporated into the power networks the time more than or equal to described threshold time.
The measuring method of voltage ride through capability of wind driven generator of the present invention and analytic system; can select the switching time of suitable crow bar holding circuit and the bypass resistance value of crow bar holding circuit for aerogenerator; and the under-voltage protection definite value of aerogenerator; so that aerogenerator possesses suitable low voltage ride-through capability, protect the safety of electrical network thus.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the process flow diagram of the measuring method embodiment one of voltage ride through capability of wind driven generator of the present invention;
Fig. 2 is the process flow diagram of the measuring method embodiment two of voltage ride through capability of wind driven generator of the present invention;
Fig. 3 is the circuit diagram of double-fed induction wind driven generator;
Fig. 4 is in the measuring method of voltage ride through capability of wind driven generator of the present invention, and low voltage ride-through capability requires synoptic diagram;
Fig. 5 is the process flow diagram of the measuring method embodiment three of voltage ride through capability of wind driven generator of the present invention;
Fig. 6 is the wind energy turbine set synoptic diagram of the measuring method of voltage ride through capability of wind driven generator of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Fig. 1 is the process flow diagram of the measuring method embodiment one of voltage ride through capability of wind driven generator of the present invention, and as shown in the figure, present embodiment specifically comprises the steps:
Because test is the low voltage ride-through capability of aerogenerator, so the measuring voltage of inputting in the also site of aerogenerator is necessarily less than the aerogenerator standard voltage value;
Because low voltage ride-through capability has requirement, be exactly under different test voltages, the time of being incorporated into the power networks that aerogenerator needs is different;
Time has surpassed or has equaled threshold time if keep being incorporated into the power networks; then do not need the switching time of the crow bar holding circuit of aerogenerator and the bypass resistance value of crow bar holding circuit are adjusted; just when keeping the time of being incorporated into the power networks less than default threshold time; need to adjust; purpose is so that keep being incorporated into the power networks the time more than or equal to threshold time; so just so that the low voltage ride-through capability of aerogenerator has reached requirement; thereby off-grid at once not when line voltage falls is protected electrical network.
Fig. 2 is the process flow diagram of the measuring method embodiment two of voltage ride through capability of wind driven generator of the present invention, and as shown in the figure, present embodiment specifically comprises the steps:
Can utilize the actual electric network data, in the digsilent software emulation platform, set up the electric system Equivalent Model of aerogenerator, transformer, circuit, load and network topology structure etc., build the computing platform that can realize low voltage ride-through capability emulation.
Table 1 is the design parameter table of aerogenerator
Table 2 is the design parameter table of circuit:
Table 3 is the design parameter table of transformer:
The 110kV network transformer
The 35kV network transformer
Load parameter is exactly burden with power and load or burden without work, or impedance and reactance.
Specifically be exactly that the dynamic response value when obtaining each bar circuit and each bar bus place and respectively three-phase shortcircuit occuring selects voltage fluctuation greater than the node aerogenerator of predeterminated voltage fluctuation threshold value;
In the under-voltage protection of the low voltage ride-through capability of not considering blower fan, blower fan self with send route protection; obtain system's dynamic response (being exactly magnitude of voltage, current value and active power and reactive power) when each bar circuit and each bar bus place respectively three phase short circuit fault occur in the system; observe the voltage stability of main monitoring node, filter out the aerogenerator node that must carry out the low-voltage capabilities setting.
The purpose of this step just refers to search the node aerogenerator except needing to possess low voltage ride-through capability, because some engine is in some node, in any case short trouble is set, system voltage and stability change are very little, so aerogenerator does not just need to have possessed low voltage ride-through capability.
Fig. 3 is the circuit diagram of double-fed induction wind driven generator, and as shown in the figure, the stator side of aerogenerator directly connects electrical network, and rotor-side connects electrical network by frequency converter.Principal feature is that rotor top-cross orthogonal transducer only needs 25% blower fan rated power; The trend that flows through current transformer has two kinds of possibility directions.Crow bar protection (crowbar) circuit wherein is in the double-fed induction wind driven generator rotor-side crowbar circuit to be housed; for the rotor-side circuit provides bypass; when detecting the network system fault and voltage occurs and fall; locking double-fed induction wind driven generator exciter converter; the simultaneously bypass in input rotor loop (releasing energy resistance) protective device; reach electric current and the superpotential effect of rotor-side transducer of restricted passage exciter converter; keep not off-grid operation of aerogenerator (this moment double-fed induction send out aerogenerator move by the induction motor mode) with this, and net side frequency converter is connected with the transformer continuation.
Based on crow bar protection switching opportunity in the protection of the crow bar of aerogenerator; when namely arriving electric current sill value (for example 1.5 to 2 times load current value); ability switching when the stand-by period is 0-10ms; the bypass circuit resistance value; be the key parameter such as resistance value of crowbar holding circuit and the typical value of protection definite value, assess each wind turbine ride-through capability and whether satisfy the low voltage ride-through capability requirement.
Fig. 4 is in the measuring method of voltage ride through capability of wind driven generator of the present invention, low voltage ride-through capability requires synoptic diagram, as shown in the figure, ordinate is ratio aerogenerator and the actual measurement voltage of site and load voltage value, horizontal ordinate is default threshold time, curve is exactly that aerogenerator need to keep the threshold value of the time of being incorporated into the power networks under some ratios of actual measurement voltage and load voltage value among the figure, for example:
When the wind-powered electricity generation unit in the wind energy turbine set has when the point voltage that is incorporated into the power networks falls to 20% rated voltage, can keep the time of being incorporated into the power networks to be the low voltage ride-through capability of operation 625ms;
In wind turbine is incorporated into the power networks the 3s of point voltage after falling, can return to rated voltage 90% the time, the wind-powered electricity generation unit in the wind energy turbine set keeps being incorporated into the power networks.
If keep the time of being incorporated into the power networks to be greater than or equal to default threshold time, illustrate that then aerogenerator meets the requirement such as the curve among Fig. 4, the result of test point is below curve, the low voltage ride-through capability that aerogenerator is described is up to standard, if and maintenance is incorporated into the power networks the time less than default threshold time, illustrate that then aerogenerator does not meet the requirement such as the curve among Fig. 4, above curve, illustrate that the low voltage ride-through capability of aerogenerator is not up to standard;
Change the switching time of crow bar holding circuit and/or the bypass resistance value of crow bar holding circuit, can change like this low voltage ride-through capability of aerogenerator, again carry out 203 and test, until meet the requirement such as the low voltage ride-through capability among Fig. 4;
The switching time can be from 0-10 milliseconds, and the bypass resistance value is 0-1 per unit value.
Test report has two kinds; it is a kind of that to be test time in step 205 directly judge meets in the situation that low voltage crossing requires; comprise measuring voltage each time in the test report that generates; maintenance under this measuring voltage is incorporated into the power networks the time; and the bypass resistance value of the switching time of the crow bar holding circuit of aerogenerator and crow bar holding circuit; and the under-voltage protection definite value of aerogenerator, and the result is that aerogenerator meets the low voltage crossing requirement.
Another kind is directly to judge in step 205 not meet the low voltage crossing requirement; revise the switching time of crow bar holding circuit and/or the bypass resistance value of crow bar holding circuit and once or for several times met the low voltage crossing requirement; measuring voltage when the test report of this moment has comprised each time test; maintenance under this measuring voltage is incorporated into the power networks the time; and the bypass resistance value of the switching time of the crow bar holding circuit of aerogenerator and crow bar holding circuit; end product is in the situation of the bypass resistance value of the switching time of the crow bar holding circuit of which aerogenerator and crow bar holding circuit, the low voltage crossing requirement that aerogenerator is up to specification.
Thus; utilize the measuring method of voltage ride through capability of wind driven generator of the present invention; can be so that aerogenerator be selected the switching time of suitable crow bar holding circuit and the bypass resistance value of crow bar holding circuit; and the under-voltage protection definite value of aerogenerator; so that aerogenerator low voltage crossing requirement up to specification; thereby so that when line voltage falls aerogenerator off-grid at once not, electrical network is protected.
Fig. 5 is the process flow diagram of the measuring method embodiment three of voltage ride through capability of wind driven generator of the present invention, and as shown in the figure, present embodiment specifically comprises the steps:
Step 301 is set up wind energy turbine set realistic model shown in Figure 6 at the DigSILENT emulation platform, chooses aerogenerator, transformer, circuit, wind energy turbine set model parameter;
Node A among Fig. 6 is that highest level has A1 and two nodes of A2, and the rank of B node is taken second place, and has two of B1 and B2, and the rank of C node is more taken second place, and the D node is minimum node.
Simulation study find not consider blower fan low voltage ride-through capability, blower fan self under-voltage protection and send in the route protection situation, blower fan off-grid on a large scale under the GPF (General Protection False action in the system threatens to the security and stability of electrical network.Therefore, for improving the security and stability of electrical network under failure condition, require wind energy turbine set will have certain low voltage ride-through capability.
The requirement of the low voltage ride-through capability of blower fan is based on the crow bar holding circuit and sets the low voltage crossing control strategy, and the requirement of blower fan low voltage ride-through capability.
When being applied to wind-powered electricity generation net wind energy turbine set shown in Figure 6 according to the selected wind-powered electricity generation unit LVRT control strategy of above step, to in the same fault situation, wind-powered electricity generation field energy with LVRT ability keeps not off-grid operation between age at failure, provide voltage support to system side, and can behind failure removal, enter fast the steady-state operation state, guaranteed the Systems balanth operation.
The analytic system of voltage ride through capability of wind driven generator of the present invention specifically comprises: input block, for the measuring voltage of inputting to the also site of described aerogenerator less than standard voltage value; Measuring unit is used for measuring the maintenance of described aerogenerator till from input test voltage to described aerogenerator off-grid and is incorporated into the power networks the time; Adjustment unit; be incorporated into the power networks the time less than default threshold time if be used for described maintenance; then adjust switching time of crow bar holding circuit of described aerogenerator and/or the bypass resistance value of described crow bar holding circuit; and the under-voltage protection definite value of aerogenerator, make described maintenance be incorporated into the power networks the time more than or equal to described threshold time.
The measuring system that aerogenerator low-voltage maintenance of the present invention is incorporated into the power networks; can select the switching time of suitable crow bar holding circuit and the bypass resistance value of crow bar holding circuit for aerogenerator; and the under-voltage protection definite value of aerogenerator; so that aerogenerator possesses suitable low voltage ride-through capability, protect the safety of electrical network thus.
The professional should further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, composition and the step of each example described in general manner according to function in the above description.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.The professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; the protection domain that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
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| CN102435882B (en) * | 2011-09-24 | 2013-11-06 | 国网电力科学研究院 | Low-voltage ride through detection device of grid-connected photovoltaic converter of passive reactor structure |
| CN102707230A (en) * | 2012-05-09 | 2012-10-03 | 东北电力科学研究院有限公司 | Method for testing response characteristic of 690V wind turbine generator to transient change of power grid |
| CN102799722B (en) * | 2012-07-05 | 2017-09-26 | 中国电力科学研究院 | A kind of wind power plant low voltage ride-through capability emulation verification method |
| CN103138289B (en) * | 2012-11-08 | 2015-05-13 | 中国电力科学研究院 | A real-time digital simulation modeling method for high-permeability wind farms |
| CN103178548B (en) * | 2013-04-11 | 2015-03-11 | 华北电力大学 | Symmetrical fault ride-through control method of double-fed wind generator set |
| CN104348144B (en) * | 2014-10-31 | 2017-11-03 | 国网宁夏电力公司电力科学研究院 | A kind of wind power plant sends out the fault detection method of circuit |
| CN104459540B (en) * | 2014-12-15 | 2017-02-22 | 云南电网有限责任公司电网规划研究中心 | Power-grid-impact-free detection method for low voltage ride through function of doubly-fed wind turbine generator system |
| CN104678302B (en) * | 2015-03-04 | 2017-07-28 | 同济大学 | The low-voltage ride-through testing system of wind generating set and method of a kind of Boost current transformers |
| CN106526347B (en) * | 2015-09-14 | 2019-08-06 | 中国电力科学研究院 | A low-voltage ride-through evaluation method for photovoltaic inverters based on digital-analog hybrid simulation |
| CN113325246A (en) * | 2020-12-15 | 2021-08-31 | 新疆金风科技股份有限公司 | Low voltage ride through detection method and device |
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