CN102832638B - Wind farm low voltage ride-through control system based on battery energy storage - Google Patents
Wind farm low voltage ride-through control system based on battery energy storage Download PDFInfo
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- CN102832638B CN102832638B CN201210307735.XA CN201210307735A CN102832638B CN 102832638 B CN102832638 B CN 102832638B CN 201210307735 A CN201210307735 A CN 201210307735A CN 102832638 B CN102832638 B CN 102832638B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a wind farm low voltage ride-through control system based on battery energy storage. The system comprises a data acquisition device, a data analyzer, a control module, a smoothing control module, a battery energy storage system, an AC/DC converter, a wind farm and a power grid. The data analyzer is used for comparing PCC (common coupling point) voltage Vpcc with a PCC voltage set value Vref, wherein when the Vpcc is smaller than the Vref, the control module comes into play and is used for controlling the battery energy storage system to be involved in a low voltage ride-through control strategy; and when the Vpcc is equal to the Vref, the smoothing control module comes into play and is used for controlling the battery energy storage system to be involved in a smoothing control strategy. Starting from the battery energy storage system, the wind farm low voltage ride-through control system based on battery energy storage analyzes PCC voltage of a wind/energy storage system and controls the running state of batteries so as to achieve low voltage ride-through controllability of a wind power system.
Description
Technical field
The invention belongs to technical field of wind power generation, be specifically related to a kind of for solving the control method of wind energy turbine set low voltage crossing.
Background technology
Because wind-powered electricity generation has conservation of power system operation cost, the advantage such as pollution-free, in many countries, be developed rapidly in recent years.Along with large-scale wind power is grid-connected, improve the serviceability of wind power system in electric network fault situation and become particularly important, wind-electricity integration operation guidance requires wind-powered electricity generation unit during line voltage falls, should possess low voltage crossing (LVRT) ability for this reason.Due to the low voltage ride-through capability of current wind turbine generator itself a little less than, so wind energy turbine set LVRT problem has become domestic and international study hotspot.Realize LVRT method and mainly contain two kinds, a kind of is the control strategy that improves current transformer, and this method is generally applicable to voltage and slightly falls situation.In electrical network generation catastrophe failure situation, the method for depending merely on improvement current transformer control strategy is difficult to realize LVRT, must increase hardware control circuit, so another kind of method is by increasing hardware control circuit, as increased Crowbar circuit in rotor-side, realizes.Can smooth wind power power stage as battery energy storage system that can flexible, also can effectively improve the LVRT ability of wind energy turbine set.
Therefore, need a kind of new wind energy turbine set low voltage ride through control system based on battery energy storage system to address the above problem.
Summary of the invention
Goal of the invention: the present invention is directed to the deficiency of wind energy turbine set low voltage traversing control method in prior art, a kind of wind energy turbine set low voltage traversing control method based on battery energy storage system is provided.
Technical scheme: for solving the problems of the technologies described above, the wind energy turbine set low voltage traversing control method based on battery energy storage system of the present invention adopts following technical scheme:
A kind of wind energy turbine set low voltage ride through control system based on battery energy storage, it is characterized in that, comprise data acquisition unit, data-analyzing machine, control module, level and smooth control module, battery energy storage system, AC/DC current transformer, wind energy turbine set and electrical network, described data acquisition unit connects described data-analyzing machine, described data-analyzing machine connects the sliding control module of described control module peace, described control module is all connected described AC/DC current transformer with described level and smooth control module, described battery energy storage system connects described AC/DC current transformer, described wind energy turbine set is connected with electrical network and is connected described AC/DC current transformer, described data acquisition unit is used for gathering wind energy turbine set and battery energy storage system PCC point voltage Vpcc, and described PCC point voltage Vpcc is inputted to described data-analyzing machine, described data-analyzing machine compares for the voltage setting value Vref that described PCC point voltage Vpcc and PCC are ordered: when Vpcc<Vref, described control module plays a role, and described control module is controlled described battery energy storage system and dropped into low voltage crossing control strategy, when Vpcc=Vref, described level and smooth control module plays a role, and described level and smooth control module is controlled described battery energy storage system and dropped into level and smooth control strategy.Wherein PCC point voltage is points of common connection voltage.
Beneficial effect: the wind energy turbine set low voltage ride through control system based on battery energy storage of the present invention is from battery energy storage system, wind/energy-storage system points of common connection (PCC) voltage is analyzed, operation conditions to battery is controlled, and to reach, meets wind power system low voltage crossing control ability.
Preferably, described level and smooth control module comprises battery charging and discharging selector, the Power Output for Wind Power Field maximum Pmax of Power Output for Wind Power Field P and setting and minimum value Pmin are compared, and when P>Pmax, battery charging and discharging selector is controlled battery energy storage system charging; When P<Pmin, battery charging and discharging selector is controlled battery energy storage system electric discharge, thereby realizes level and smooth control strategy.
Preferably, described control module is according to the dynamic change of PCC point voltage Vpcc, and dynamically follow the tracks of set point Vref, the modulating wave amplitude and the modulating wave phase place that regulate PWM to control, obtain the modulation wave signal of PWM control and carry out PWM control with triangular carrier signal, thereby realizing low voltage crossing control strategy.It is to utilize the numeral of microprocessor to export a kind of very effective technology that analog circuit is controlled that PWM controls (being Pulse WidthModulation-pulse-width modulation or pulse width modulation) pulse width modulation (PWM), is widely used in from many fields of measure, communicate by letter power control and conversion.
Preferably, described control module comprises pi regulator and Fuzzy PI Controller, meritorious reference current i
drefthe described pi regulator of process also increases coupled voltages i
dω L obtains the modulating wave amplitude A that PWM controls, meritorious reference current i
dref=P
ref/ V, wherein, V is cell output voltage effective value, P
reffor active power reference value; PCC point voltage Vpcc dynamically follows the tracks of set point Vref, through described Fuzzy PI Controller, produces reactive current reference quantity i
qref, then pass through described pi regulator and increase coupled voltages i
qω L obtains the modulating wave phase place α that PWM controls, and by above-mentioned control, can obtain the modulation wave signal A cos (ω t+ α) that PWM controls.The present invention is dynamically followed the tracks of and is controlled its set point by observation PCC point voltage, adopts meritorious, idle decoupling zero PI control algolithm, and considers the dynamic shortcoming such as poor of conventional PI control, and fuzzy control strategy is applied to wherein.By tracking, control grid-connected point voltage reference value, through Fuzzy PI Controller, regulate modulation wave signal amplitude and the phase place in PWM control, obtain the modulation wave signal that PWM controls, the object of controlling to realize wind energy turbine set low voltage crossing.
Preferably, described AC/DC current transformer adopts IGBT switch, the triangular carrier signal comparison that the modulation wave signal that PWM is controlled and amplitude are ± 1, obtain pulse signal, described pulse signal is pwm control signal, and described pwm control signal is for controlling the state of described AC/DC current transformer IGBT switch.The present invention adopts the PWM control technology of the three-phase bridge circuit being comprised of full-control type device for power switching IGBT, and it effectively reduces the reactive loss of current transformer, and useful battery participates in system low-voltage and passes through control.IGBT switch belongs to full-control type device for power switching, has the advantages such as driving power is little, saturation pressure reduces, switching speed is fast, and is widely used in 600V and above converter system.
Preferably, described control module also comprises fuzzy logic inference device, and Fuzzy PI comprises the following steps:
1), when PCC point voltage is disturbed, produce an error e;
2), through described fuzzy logic inference device, produce PI parameter increment of adjustment Δ K
p, Δ k
i;
3), according to formula
PI parameter value K adjusts
p, k
i, obtain the parameter tuning value K ' of described Fuzzy PI Controller
p, k '
i, by parameter tuning value K '
p, k '
ias the new parameter value of described Fuzzy PI Controller.
Preferably, the input of described fuzzy logic inference device and output all adopt triangle membership function to set up fuzzy rule.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention is based on the wind energy turbine set low voltage ride through control system of battery energy storage;
Fig. 2 is the structural representation that the present invention is based on control module in the wind energy turbine set low voltage ride through control system of battery energy storage;
Fig. 3 is the structural representation that the present invention is based on level and smooth control module in the wind energy turbine set low voltage ride through control system of battery energy storage;
Fig. 4 is that the control system of the present invention that application software PSCAD builds is not increasing PCC point voltage dynamic response under battery energy storage system;
Fig. 5 is that the control system of the present invention that builds of application software PSCAD is at the dynamic response that does not increase double-fed induction wind driven generator stator and rotor A phase current under battery energy storage system;
Fig. 6 is the dynamic response of control system of the present invention PCC point voltage under increase battery energy storage system of application software PSCAD structure;
Fig. 7 is the dynamic response of control system of the present invention double-fed induction wind driven generator stator and rotor A phase current under increase battery energy storage system of application software PSCAD structure;
Fig. 8 is that the control system of the present invention that application software PSCAD builds is increasing battery energy storage system reactive response under battery energy storage system;
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment is only not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
Refer to shown in Fig. 1, the present invention is based on the overall structure block diagram of the wind energy turbine set low voltage ride through control system of battery energy storage, this control system comprises data acquisition unit 1, data-analyzing machine 2, control module 3, level and smooth control module 4, battery energy storage system 5, AC/DC current transformer 6, wind energy turbine set 7 and electrical network 8.By data acquisition unit 1, obtain wind energy turbine set 7, battery energy storage system 5 (wind/storage system) PCC point voltage Vpcc (being grid-connected point voltage), and its input data analysis device 2 is compared to analysis with PCC point voltage set point Vref.Judge battery switching running status, when system breaks down, during Vpcc<Vref, battery energy storage system 5 drops into low voltage crossing control strategies, and now control module 3 works; When system is normally moved, during Vpcc=Vref, battery energy storage system 5 drops into level and smooth control strategy, and now level and smooth control module 4 works.Power Output for Wind Power Field maximum Pmax and the minimum value Pmin of this control strategy based on Power Output for Wind Power Field P and setting compares, and when P>Pmax, wind power is too much, battery charging; When P<Pmin, wind underpower, battery discharge.Wherein level and smooth control module 4 comprises battery charging and discharging selector 12, the Power Output for Wind Power Field maximum Pmax of Power Output for Wind Power Field P and setting and minimum value Pmin are compared, when P>Pmax, wind power is too much, and battery charging and discharging selector 12 is controlled battery energy storage system 5 chargings; When P<Pmin, wind underpower, battery charging and discharging selector 12 is controlled battery energy storage system 5 electric discharges.
As shown in Figure 2, the structural representation of control module in the wind energy turbine set low voltage traversing control method based on battery energy storage, comprises pi regulator 9, Fuzzy PI Controller 10.This control module is that battery energy storage system 5 drops into the strategy that low voltage crossing is controlled.Active current reference quantity i
dref=P
ref/ V follows the tracks of the meritorious reference quantity of battery output as controlling, and process pi regulator 9 also increases coupled voltages i
dω L obtains the modulating wave amplitude A that PWM controls.Wherein, i
dref=P
ref/ V (V is cell output voltage effective value) is as control following the tracks of battery output active current reference quantity, and battery output AC side D axle is controlled reference quantity, reflection be the demand of system active power.PCC point voltage Vpcc dynamically follows the tracks of set point Vref, through Fuzzy PI Controller 10, produces reactive current reference quantity i
qref, as battery output AC side Q axle, control reference quantity, then pass through pi regulator 9 and increase coupled voltages i
qω L obtains the modulating wave phase place α that PWM controls, and obtains thus the modulation wave signal A cos (ω t+ α) that PWM controls.Wherein, AC/DC current transformer 6 adopts IGBT switch.After the triangular carrier signal that is ± 1 by modulation wave signal A cos (ω t+ α) and amplitude, obtain pulse signal, pwm switching signal, utilizes this pwm switching signal to control AC/DC current transformer 6 IGBT on off states.The method of utilizing pwm switching signal to control IGBT on off state is: the modulation wave signal that PWM is controlled, and relatively obtain triggering the signal of AC/DC current transformer IGBT switch with the triangular carrier signal that amplitude is ± 1.
Wherein, fuzzy PI hybrid control mechanism is:
1), when PCC point voltage is disturbed, produce an error e;
2), through described fuzzy logic inference device, produce PI parameter increment of adjustment Δ K
p, Δ k
i;
3), according to formula
PI parameter value K adjusts
p, k
i, obtain the parameter tuning value K ' of described Fuzzy PI Controller
p, k '
i, by this parameter tuning value using as the new parameter value of described Fuzzy PI Controller.
Low voltage crossing control principle of the present invention: first from battery energy storage system, wind/energy-storage system points of common connection (PCC) voltage is analyzed, the instruction that proposition is controlled the operation conditions of battery, meets wind power system low voltage crossing control ability to reach; Secondly, due to features such as conventional PI control difference in response, fuzzy control is applied to wherein, to reach, improves LVRT effect; Finally, increase coupled voltages, suitably regulate modulation wave signal amplitude and the phase place of PWM in controlling, and adopt PWM technology to control the three-phase bridge circuit being formed by full-control type device for power switching IGBT, thereby realized battery energy storage system, improve system low-voltage and pass through function.
Contrast accompanying drawing 1, accompanying drawing 2 have been built above-mentioned control system on the PSCAD of simulation software platform.
If a battery energy storage system 5 is set up in 7 outlets of certain wind energy turbine set, this battery adopts lithium battery energy storage battery system, and site there is three phase short circuit fault, it is 30% that fault is fallen the degree of depth, trouble duration 0.5s.
As shown in Figure 4 and Figure 5, the control system of the present invention that application simulation software PSCAD builds is at the dynamic response that does not increase by 5 times PCC point voltages of lithium battery energy storage battery system and double-fed induction wind driven generator (DFIG) stator and rotor A phase current.During electric network fault, wind energy turbine set is not when having battery energy storage system 5 to control, and PCC point voltage drops to rapidly 0.7pu, causes thus DFIG stator and rotor electric current to increase, and to current transformer, brings great impact.
As shown in Fig. 6, Fig. 7 and Fig. 8, the control system of the present invention that application simulation software PSCAD builds is increasing the dynamic response of 5 times PCC point voltages of battery energy storage system and DFIG stator and rotor A phase current.Battery energy storage system 5 responds compensating reactive power at once to support points of common connection voltage stabilization, as shown in Figure 8.Because system voltage recovers, DFIG stator and rotor electric current is also made a response and is controlled in the scope of expectation, and stator current ascensional range is lower than 2 times of rated values, and rotor current basic controlling is at initial value, as shown in Figure 7.Increase BESS control system and make system to return back in time initial value, wind energy turbine set has realized low voltage crossing, and it is stable that system has been recovered.
The present invention is dynamically followed the tracks of and is controlled its set point by observation PCC point voltage, adopts meritorious, idle decoupling zero PI control algolithm, and considers the dynamic shortcoming such as poor of conventional PI control, and fuzzy control strategy is applied to wherein.By tracking, control grid-connected point voltage reference value, through Fuzzy PI Controller, regulate modulation wave signal amplitude and the phase place in PWM control, obtain the modulation wave signal that PWM controls, the object of controlling to realize wind energy turbine set low voltage crossing.The PWM control technology of the three-phase bridge circuit that employing is comprised of full-control type device for power switching IGBT, it effectively reduces the reactive loss of current transformer, and useful battery participates in system low-voltage and passes through control.
Claims (6)
1. the wind energy turbine set low voltage ride through control system based on battery energy storage, it is characterized in that, comprise data acquisition unit (1), data-analyzing machine (2), control module (3), level and smooth control module (4), battery energy storage system (5), AC/DC current transformer (6), wind energy turbine set (7) and electrical network (8), described data acquisition unit connects described data-analyzing machine, described data-analyzing machine connects the sliding control module (4) of described control module (3) peace, described control module (3) is all connected described AC/DC current transformer (6) with described level and smooth control module (4), described battery energy storage system (5) connects described AC/DC current transformer, described wind energy turbine set (7) is connected with electrical network (8) and is connected described AC/DC current transformer (6), described data acquisition unit (1) is for gathering wind energy turbine set (7) and battery energy storage system (5) PCC point voltage Vpcc, and described PCC point voltage Vpcc is inputted to described data-analyzing machine (2), described data-analyzing machine (2) compares for the voltage setting value Vref that described PCC point voltage Vpcc and PCC are ordered: when Vpcc<Vref, described control module (3) plays a role, and described control module (3) is controlled described battery energy storage system (5) and dropped into low voltage crossing control strategy, when Vpcc=Vref, described level and smooth control module (4) plays a role, described level and smooth control module (4) is controlled described battery energy storage system (5) and is dropped into level and smooth control strategy, described control module (3) comprises Fuzzy PI Controller (10), according to the dynamic change of PCC point voltage Vpcc, utilize described Fuzzy PI Controller (10) dynamically to follow the tracks of the voltage setting value Vref that PCC is ordered, the modulating wave amplitude and the modulating wave phase place that regulate PWM to control, obtain the modulation wave signal of PWM control and carry out PWM control with triangular carrier signal, thereby realizing low voltage crossing control strategy.
2. the wind energy turbine set low voltage ride through control system based on battery energy storage as claimed in claim 1, it is characterized in that, described level and smooth control module (4) comprises battery charging and discharging selector (12), the Power Output for Wind Power Field maximum Pmax of wind energy turbine set (7) power output P and setting and minimum value Pmin are compared, when P>Pmax, battery charging and discharging selector (12) is controlled battery energy storage system (5) charging; When P<Pmin, battery charging and discharging selector (12) is controlled battery energy storage system (5) electric discharge, thereby realizes level and smooth control strategy.
3. the wind energy turbine set low voltage ride through control system based on battery energy storage as claimed in claim 1, is characterized in that, described control module (3) also comprises pi regulator (9), meritorious reference current i
drefprocess described pi regulator (9) also increases coupled voltages i
dω L obtains
to PWMthe modulating wave amplitude A controlling, meritorious reference current i
dref=P
ref/ V, wherein, V is cell output voltage effective value, P
reffor active power reference value; PCC point voltage Vpcc dynamically follows the tracks of set point Vref, through described Fuzzy PI Controller (10), produces reactive current reference quantity i
qref, then pass through described pi regulator (9) and increase coupled voltages i
qω L obtains the modulating wave phase place α that PWM controls, and by above-mentioned control, can obtain the modulation wave signal A cos (ω t+ α) that PWM controls.
4. the wind energy turbine set low voltage ride through control system based on battery energy storage as claimed in claim 1, it is characterized in that, described AC/DC current transformer (6) adopts IGBT switch, the triangular carrier signal comparison that the modulation wave signal that PWM is controlled and amplitude are ± 1, obtain pulse signal, described pulse signal is pwm control signal, and described pwm control signal is for controlling the state of described AC/DC current transformer IGBT switch.
5. the wind energy turbine set low voltage ride through control system based on battery energy storage as claimed in claim 3, is characterized in that, described control module (3) also comprises fuzzy logic inference device, and Fuzzy PI comprises the following steps:
1), when PCC point voltage is disturbed, produce an error e;
2), through described fuzzy logic inference device (11), produce PI parameter increment of adjustment Δ K
p, Δ k
i;
3), according to formula
PI parameter value K adjusts
p, k
i, obtain the parameter tuning value K ' of described Fuzzy PI Controller (10)
p, k '
i, by setting value K '
p, k '
ias the new parameter value of described Fuzzy PI Controller (10).
6. the wind energy turbine set low voltage ride through control system based on battery energy storage as claimed in claim 5, is characterized in that, the input of described fuzzy logic inference device (11) and output all adopt triangle membership function to set up fuzzy rule.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103078339B (en) * | 2013-01-29 | 2015-02-18 | 武汉大学 | Low-voltage ride through control system and method for capacity-optimal energy-storage type double-fed motor |
| CN103248067B (en) * | 2013-04-27 | 2016-03-02 | 京东方科技集团股份有限公司 | The low voltage ride through control method of photovoltaic combining inverter and device |
| CN103580051B (en) * | 2013-11-19 | 2016-01-20 | 国家电网公司 | Consider the wind storage system battery charge state Optimal Control System of part throttle characteristics |
| CN104701865A (en) * | 2015-03-19 | 2015-06-10 | 国家电网公司 | Voltage flicker detecting and control method based on battery energy storage system |
| CN105186557A (en) * | 2015-08-26 | 2015-12-23 | 国网冀北电力有限公司秦皇岛供电公司 | Grid-connected inverter control system and control method thereof |
| CN110011352B (en) * | 2018-01-04 | 2020-11-10 | 中国石油化工股份有限公司 | Voltage drop control method containing new energy grid connection |
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