CN104836257A - Integrated low-voltage ride through regulation and control device of wind power generation - Google Patents
Integrated low-voltage ride through regulation and control device of wind power generation Download PDFInfo
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- CN104836257A CN104836257A CN201510293146.4A CN201510293146A CN104836257A CN 104836257 A CN104836257 A CN 104836257A CN 201510293146 A CN201510293146 A CN 201510293146A CN 104836257 A CN104836257 A CN 104836257A
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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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Abstract
Provided is an integrated low-voltage ride through regulation and control device of wind power generation. The integrated regulation and control device is used immediately that a voltage sag fault is detected in a low-voltage ride through system. An inverter obtains stable DC voltage from a DC energy storage device, a compensation voltage is generated by inversion, and the compensation voltage is connected in series to the system via a filter. The sum of the compensation voltage and the voltage after sag of the electrical network equals the voltage when the electrical network works normally, so that a generator end is kept in normal operation; and at the same time, a fixed capacitor implements reactive compensation, and an energy-consuming resistor consumes active power emitted by the generator end when the voltage is reduced transiently.
Description
Technical field
The present invention relates to technical field of wind power generation, specifically, is a kind of wind power generation low-voltage ride-through comprehensive regulation device.
Background technology
During grid voltage sags, due to the restriction by converter through-current capability, net side inverter injects grid power and reduces.And the power of pusher side rectifier does not change this moment, cause the overvoltage of DC side.If maintenance DC-side Voltage Stabilization, then must cause inverter overcurrent.Overvoltage and overcurrent all will cause the damage of power electronic device, and in order to protect converter not damaged, wind turbine generator will be out of service when Voltage Drop.Electrical network penetrance hour, wind turbine generator is out of service or acceptable when Voltage Drop.But, along with the continuous expansion of wind power generation scale, if Wind turbines still takes passive protection formula off-grid when Voltage Drop, then can increase the recovery difficulty of whole system, even make fault more serious, finally cause the whole off-the-line of other units of system.Some leading countries are developed at present at wind generating technology, as Denmark, Germany etc., oneself has formulated new operation of power networks criterion in succession, quantitatively give the off-grid condition of wind power system (as minimum voltage falls the degree of depth and dip duration), only have when grid voltage sags just allows wind energy conversion system off-grid lower than regulation curve later, when voltage is at sunk part, generator should provide reactive power.This just requires that wind power system has stronger low voltage ride-through capability, can easily for electrical network provides reactive power support.Therefore must study the measure of low voltage crossing, when realizing grid voltage sags wind-driven generator not off-grid run.
Summary of the invention
Based on the deficiency that prior art exists, the present invention proposes a kind of wind power generation low-voltage ride-through comprehensive regulation device.
LVRT Capability of Wind Turbine Generator system groundwork module has three parts, electrical network, low voltage crossing comprehensive regulation device, Wind turbines.DC energy source feedway is connected with energy consumption resistor module with inverter vertical compression side, for both provide stable vertical compression.
Low voltage ride through system is after electrical network generation Voltage Drop fault being detected, and comprehensive regulation device comes into operation at once.Inverter obtains stable vertical compression from DC energy storage device, produces bucking voltage by inversion, more after filtering device series connection connecting system.Bucking voltage fall with former electrical network after voltage be added, when normally running with electrical network, voltage is equal, makes fan end keep normal and runs; Fixed capacitor compensating reactive power simultaneously, energy consumption resistor is responsible for the active power that when attrition voltage falls temporarily, fan end sends.
During wind energy conversion system runs, after ignoring wake losses, tip loss and wheel hub loss (namely thinking that blade root is at r=O place), the wind power that wind wheel absorbs is mainly by the impact of three factors: wind speed v, propeller pitch angle
and tip speed ratio
.
The power that wind energy conversion system absorbs
for
In formula
the wind power that-blower fan absorbs, W;
-atmospheric density, kg/m
3
R-blower fan radius, m
V-wind speed, m/s
-power coefficient
-tip speed ratio is tip speed and the ratio of wind speed,
-propeller pitch angle, the angle between radius r place blade rotary plane and blade cross section chord length
When grid voltage sags, the power that net side converter exports is restricted, and this can cause the rising of DC voltage, and therefore DC side must take measures to keep power-balance, limits its voltage and raises.For improving the low voltage ride-through capability of directly driven wind-powered system; usual increase excess voltage protection, absorbs unnecessary energy by Crowbar circuit between age at failure, and by with the coordinating of net side converter; keep direct voltage constant, make wind power system can continue safe being incorporated into the power networks.
And energy consumption resistor is its important part in Crowbar circuit, the resistance of energy consumption resistor is selected directly to decide in low voltage crossing process, and can active power be consumed reliably.
First, in Crowbar circuit, adopt conventional diode rectifier, the average output voltage of diode rectifier
with the line voltage of its input
between pass be
In Crowbar circuit, the load of diode rectifier circuit can be equivalent to resistive load, namely
In formula,
-Crowbar circuit rectifies output current
-Crowbar circuit rectifies output voltage
-Crowbar circuit energy consumption resistor resistance
-rotor phase voltage
-rotor line voltage
-Crowbar circuit equivalent energy consumption resistor resistance
Crowbar circuit working flow process is as follows:
When set end voltage drops into below 0.8pu:
(1) there is moment in fault, grid voltage sags detected, and grid side converter LVRT controls to start;
(2) Crowbar protection starts, the locking of rotor-side converter;
(3) short trouble excision;
(4) grid side converter LVRT controls to exit;
(5), after failure removal after 1-2 cycle, Crowbar protects releasing, rotor-side converter deblocking;
(6) DFIG unit recovers normal control.
When set end voltage does not drop to below 0.8pu, then omit second step and the 5th step in above-mentioned steps, only retain the LVRT control strategy of grid side converter, utilize the control ability of DFIG self to return to steady operational status simultaneously.
In wind turbine low voltage crossing, control method adopts voltage compensation strategy, maintains fan end voltage stabilization when electrical network generation voltage dip fault, and the active power that consumption blower fan sends.
Main control strategies can be divided into two parts: Part I is voltage compensation, and Part II is meritorious consumption.
Voltage compensation
In order to select compensate for reference voltage, first extracting phase place, the as the reference voltage phase place of waveform from fan end voltage, then giving a standard sine wave.Revest this sinusoidal wave amplitude, this amplitude is the amplitude of voltage dip voltage, material is thus formed series compensation reference voltage.It and actual bucking voltage compare, and errors amplifies through PI link, and last and triangular wave compares and obtains voltage compensation signal and send to IGBT.A new virtual voltage offset can be obtained by above-mentioned control, continue to compare with reference voltage level by feedback, material is thus formed a closed-loop control, virtual voltage offset is constantly drawn close to reference value, until identical.PI controlling unit is limited to 1 up and down, and the positive and negative amplitude of triangular wave is also 1.
Active power consumption controls
When electrical network generation voltage dip fault, blower fan bus disconnects the connection with electrical network, and it is meritorious directly through low voltage crossing comprehensive regulation device that blower fan sends, and in vertical compression side, energy consumption resistor place consumes.Resistance sizes and fan end active power of output close relation, meet ohm law.And controlled by IGBT, real-time tracking fan end can send active power size, accomplish accurate tracking, regulation and control IGBT control signal, controlling resistance make-and-break time, carry out meritorious accurately consumption, energy consumption resistor IGBT control signal obtains primarily of high and low level pulse signal and triangle wave, when being located at fault, is that high level signal and triangular wave contrast always, along with the change of high level size, the time of break-make can be controlled.(now set the upper and lower amplitude of triangular wave as 1) when high level signal size is 1 always, to be so that l, IGBT continue open-minded always for control signal, and energy consumption resistor is gained merit with full power consumption; When high level signal size reduces, just there will be pulse-modulated signal with after triangle wave, is no longer full power operation, and it is meritorious that this needs accurate tracking fan end to send, and controls along with meritorious size variation, adjustment high level signal size.
Further, the invention allows for DC side protective circuit, with the collaborative work of crowbar circuit, alleviate the live load of crowbar, maintain the stable of low voltage crossing to carry out, due to when grid voltage sags, rotor-side overcurrent, grid side current transformer power output is restricted, energy can cause DC voltage to raise in DC side accumulation, DC bus capacitor and power device may be damaged, in order to overcome this problem, chopper circuit is increased in DC side, when grid voltage sags, rotor-side overcurrent, now drop into dump load, consume the energy that DC side is unnecessary, then voltage stabilization can be kept, namely remove outside the power consumption of crowbar circuit, increase chopper circuit in DC side further and carry out power consumption absorption.Meanwhile, also adopt energy storage device in DC side, the excess energy between age at failure can store by this system, and after fault terminates, these energy is sent into electrical network.Adopt DC side protective circuit and the collaborative work of crowbar circuit, the problem that must switch between different running status when compensate for Crowbar isolated operation, had both avoided operating mode and had switched the transient process caused, and can carry out continuing regulation and control to system.
Collaborative Control is protected by adopting crowbar circuit and DC side; thus provide the low voltage crossing safeguard way of DC side and parallel connection; in addition; based on the principle of soft start in parallel; the present invention proposes a kind of brake impedance in alternating current circuit; namely, when electrical network low voltage runs, in the circuit of blower fan to electrical network input power, add brake impedance, thus carry out urgent energy-absorbing or buffering.
Its principle is after grid collapses excision, and on sending end power plant bus, the short time drops into reactor, and absorption process energy, makes generating set quick deceleration after failure removal, reaches the object improving Generator Transient Stability.Tandem brake impedance methodologies be when system jam, the series connection of wind turbine end is braked impedance, and short circuit current flows through brake impedance, can not be delivered to a part of excess power of electrical network when absorbing electric network fault, thus elevator terminal voltage, prevents rotor stall.Further, can access in blower fan transmission line by the structures in series that multiple switch is in parallel with brake impedance, during normal operation, switch closes, brake impedance does not carry out work, when electric network fault or subnormal voltage operation, select the brake impedance quantity needing to adopt according to the output parameter of wind turbine, thus open corresponding switch and carry out power absorption.
After grid voltage sags, need restriction inverter current constant to protect its safe operation:
In formula
for the line voltage after Voltage Drop,
for electrical network rated voltage,
for falling rear inverter active power of output,
for the active power that inverter before grid voltage sags exports,
for inverter output current.Because generator, rectifier power do not change, cause DC link unbalanced power, the rising that result in direct voltage jeopardizes the safety of power electronic device.Output of a generator is reduced by controller side rectifier
, make
, can keep power balance of DC side, restriction direct voltage raises, and realizes the low voltage crossing of wind power system.
Accompanying drawing explanation
Fig. 1 is wind power generation low-voltage ride-through comprehensive regulation device crowbar energy consumption resistor and equivalent resistance schematic diagram thereof
Fig. 2 is the protection of wind power generation low-voltage ride-through comprehensive regulation device DC side and brake resistor circuit.
Embodiment
A kind of wind power generation low-voltage ride-through comprehensive regulation device, LVRT Capability of Wind Turbine Generator system groundwork module has three parts, electrical network, low voltage crossing comprehensive regulation device, Wind turbines.DC energy source feedway is connected with energy consumption resistor module with inverter vertical compression side, for both provide stable vertical compression.
Low voltage ride through system is after electrical network generation Voltage Drop fault being detected, and comprehensive regulation device comes into operation at once.Inverter obtains stable vertical compression from DC energy storage device, produces bucking voltage by inversion, more after filtering device series connection connecting system.Bucking voltage fall with former electrical network after voltage be added, when normally running with electrical network, voltage is equal, makes fan end keep normal and runs; Fixed capacitor compensating reactive power simultaneously, energy consumption resistor is responsible for the active power that when attrition voltage falls temporarily, fan end sends.
During wind energy conversion system runs, after ignoring wake losses, tip loss and wheel hub loss (namely thinking that blade root is at r=O place), the wind power that wind wheel absorbs is mainly by the impact of three factors: wind speed v, propeller pitch angle
and tip speed ratio
.
The power that wind energy conversion system absorbs
for
In formula
the wind power that-blower fan absorbs, W;
-atmospheric density, kg/m
3
R-blower fan radius, m
V-wind speed, m/s
-power coefficient
-tip speed ratio is tip speed and the ratio of wind speed,
-propeller pitch angle, the angle between radius r place blade rotary plane and blade cross section chord length
When grid voltage sags, the power that net side converter exports is restricted, and this can cause the rising of DC voltage, and therefore DC side must take measures to keep power-balance, limits its voltage and raises.For improving the low voltage ride-through capability of directly driven wind-powered system; usual increase excess voltage protection, absorbs unnecessary energy by Crowbar circuit between age at failure, and by with the coordinating of net side converter; keep direct voltage constant, make wind power system can continue safe being incorporated into the power networks.
And energy consumption resistor is its important part in Crowbar circuit, the resistance of energy consumption resistor is selected directly to decide in low voltage crossing process, and can active power be consumed reliably.
As shown in Figure 1, first, in Crowbar circuit, conventional diode rectifier is adopted, the average output voltage of diode rectifier
with the line voltage of its input
between pass be
In Crowbar circuit, the load of diode rectifier circuit can be equivalent to resistive load, namely
In formula,
-Crowbar circuit rectifies output current
-Crowbar circuit rectifies output voltage
-Crowbar circuit energy consumption resistor resistance
-rotor phase voltage
-rotor line voltage
-Crowbar circuit equivalent energy consumption resistor resistance
Crowbar circuit working flow process is as follows:
When set end voltage drops into below 0.8pu:
(1) there is moment in fault, grid voltage sags detected, and grid side converter LVRT controls to start;
(2) Crowbar protection starts, the locking of rotor-side converter;
(3) short trouble excision;
(4) grid side converter LVRT controls to exit;
(5), after failure removal after 1-2 cycle, Crowbar protects releasing, rotor-side converter deblocking;
(6) DFIG unit recovers normal control.
When set end voltage does not drop to below 0.8pu, then omit second step and the 5th step in above-mentioned steps, only retain the LVRT control strategy of grid side converter, utilize the control ability of DFIG self to return to steady operational status simultaneously.
In wind turbine low voltage crossing, control method adopts voltage compensation strategy, maintains fan end voltage stabilization when electrical network generation voltage dip fault, and the active power that consumption blower fan sends.
Main control strategies can be divided into two parts: Part I is voltage compensation, and Part II is meritorious consumption.
Voltage compensation
In order to select compensate for reference voltage, first extracting phase place, the as the reference voltage phase place of waveform from fan end voltage, then giving a standard sine wave.Revest this sinusoidal wave amplitude, this amplitude is the amplitude of voltage dip voltage, material is thus formed series compensation reference voltage.It and actual bucking voltage compare, and errors amplifies through PI link, and last and triangular wave compares and obtains voltage compensation signal and send to IGBT.A new virtual voltage offset can be obtained by above-mentioned control, continue to compare with reference voltage level by feedback, material is thus formed a closed-loop control, virtual voltage offset is constantly drawn close to reference value, until identical.PI controlling unit is limited to 1 up and down, and the positive and negative amplitude of triangular wave is also 1.
Active power consumption controls
When electrical network generation voltage dip fault, blower fan bus disconnects the connection with electrical network, and it is meritorious directly through low voltage crossing comprehensive regulation device that blower fan sends, and in vertical compression side, energy consumption resistor place consumes.Resistance sizes and fan end active power of output close relation, meet ohm law.And controlled by IGBT, real-time tracking fan end can send active power size, accomplish accurate tracking, regulation and control IGBT control signal, controlling resistance make-and-break time, carry out meritorious accurately consumption, energy consumption resistor IGBT control signal obtains primarily of high and low level pulse signal and triangle wave, when being located at fault, is that high level signal and triangular wave contrast always, along with the change of high level size, the time of break-make can be controlled.(now set the upper and lower amplitude of triangular wave as 1) when high level signal size is 1 always, to be so that l, IGBT continue open-minded always for control signal, and energy consumption resistor is gained merit with full power consumption; When high level signal size reduces, just there will be pulse-modulated signal with after triangle wave, is no longer full power operation, and it is meritorious that this needs accurate tracking fan end to send, and controls along with meritorious size variation, adjustment high level signal size.
As shown in Figure 2, further, the invention allows for DC side protective circuit, with the collaborative work of crowbar circuit, alleviate the live load of crowbar, maintain the stable of low voltage crossing to carry out, due to when grid voltage sags, rotor-side overcurrent, grid side current transformer power output is restricted, energy can cause DC voltage to raise in DC side accumulation, DC bus capacitor and power device may be damaged, in order to overcome this problem, chopper circuit is increased in DC side, when grid voltage sags, rotor-side overcurrent, now drop into dump load, consume the energy that DC side is unnecessary, then voltage stabilization can be kept, namely remove outside the power consumption of crowbar circuit, increase chopper circuit in DC side further and carry out power consumption absorption.Meanwhile, also adopt energy storage device in DC side, the excess energy between age at failure can store by this system, and after fault terminates, these energy is sent into electrical network.Adopt DC side protective circuit and the collaborative work of crowbar circuit, the problem that must switch between different running status when compensate for Crowbar isolated operation, had both avoided operating mode and had switched the transient process caused, and can carry out continuing regulation and control to system.
Collaborative Control is protected by adopting crowbar circuit and DC side; thus provide the low voltage crossing safeguard way of DC side and parallel connection; in addition; based on the principle of soft start in parallel; the present invention proposes a kind of brake impedance in alternating current circuit; namely, when electrical network low voltage runs, in the circuit of blower fan to electrical network input power, add brake impedance, thus carry out urgent energy-absorbing or buffering.
Its principle is after grid collapses excision, and on sending end power plant bus, the short time drops into reactor, and absorption process energy, makes generating set quick deceleration after failure removal, reaches the object improving Generator Transient Stability.Tandem brake impedance methodologies be when system jam, the series connection of wind turbine end is braked impedance, and short circuit current flows through brake impedance, can not be delivered to a part of excess power of electrical network when absorbing electric network fault, thus elevator terminal voltage, prevents rotor stall.Further, can access in blower fan transmission line by the structures in series that multiple switch is in parallel with brake impedance, during normal operation, switch closes, brake impedance does not carry out work, when electric network fault or subnormal voltage operation, select the brake impedance quantity needing to adopt according to the output parameter of wind turbine, thus open corresponding switch and carry out power absorption.
After grid voltage sags, need restriction inverter current constant to protect its safe operation:
In formula
for the line voltage after Voltage Drop,
for electrical network rated voltage,
for falling rear inverter active power of output,
for the active power that inverter before grid voltage sags exports,
for inverter output current.Because generator, rectifier power do not change, cause DC link unbalanced power, the rising that result in direct voltage jeopardizes the safety of power electronic device.Output of a generator is reduced by controller side rectifier
, make
, can keep power balance of DC side, restriction direct voltage raises, and realizes the low voltage crossing of wind power system.
The foregoing is only of the present invention and be preferably not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (6)
1. a wind power generation low-voltage ride-through comprehensive regulation device, it is characterized in that, LVRT Capability of Wind Turbine Generator system comprises: electrical network, low voltage crossing comprehensive regulation device and Wind turbines, low voltage ride through system is after electrical network generation Voltage Drop fault being detected, inverter obtains stable vertical compression from DC energy storage device, bucking voltage is produced by inversion, again after filtering device series connection connecting system, bucking voltage fall with former electrical network after voltage be added, when normally running with electrical network, voltage is equal, makes fan end keep normal and runs; Fixed capacitor compensating reactive power simultaneously, energy consumption resistor is responsible for the active power that when attrition voltage falls temporarily, fan end sends.
2. wind power generation low-voltage ride-through comprehensive regulation device as claimed in claim 1, is characterized in that, the power that wind energy conversion system absorbs
for
In formula:
the wind power that-blower fan absorbs, W;
-atmospheric density, kg/m
3
R-blower fan radius, m
V-wind speed, m/s
-power coefficient
-tip speed ratio is tip speed and the ratio of wind speed,
-propeller pitch angle, the angle between radius r place blade rotary plane and blade cross section chord length.
3. wind power generation low-voltage ride-through comprehensive regulation device as claimed in claim 2, is characterized in that, in Crowbar circuit, adopts conventional diode rectifier, the average output voltage of diode rectifier
with the line voltage of its input
between pass be
In Crowbar circuit, the load equivalent of diode rectifier circuit is resistive load, namely
In formula,
-Crowbar circuit rectifies output current
-Crowbar circuit rectifies output voltage
-Crowbar circuit energy consumption resistor resistance
-rotor phase voltage
-rotor line voltage
-Crowbar circuit equivalent energy consumption resistor resistance
Crowbar circuit working flow process is as follows:
When set end voltage drops into below 0.8pu:
(1) there is moment in fault, grid voltage sags detected, and grid side converter LVRT controls to start;
(2) Crowbar protection starts, the locking of rotor-side converter;
(3) short trouble excision;
(4) grid side converter LVRT controls to exit;
(5), after failure removal after 1-2 cycle, Crowbar protects releasing, rotor-side converter deblocking;
(6) DFIG unit recovers normal control,
When set end voltage does not drop to below 0.8pu, then omit second step and the 5th step in above-mentioned steps, only retain the LVRT control strategy of grid side converter, utilize the control ability of DFIG self to return to steady operational status simultaneously.
4. wind power generation low-voltage ride-through comprehensive regulation device as claimed in claim 3, it is characterized in that, main control strategies can be divided into two parts: Part I is voltage compensation, and Part II is meritorious consumption,
Voltage compensation, first phase place is extracted from fan end voltage, the phase place of waveform as the reference voltage, then a standard sine wave is given, revest this sinusoidal wave amplitude, this amplitude is the amplitude of voltage dip voltage, material is thus formed series compensation reference voltage, it and actual bucking voltage compare, errors amplifies through PI link, last and triangular wave compares and obtains voltage compensation signal and send to IGBT, a new virtual voltage offset can be obtained by above-mentioned control, continue to compare with reference voltage level by feedback, form closed-loop control, virtual voltage offset is constantly drawn close to reference value, until identical, PI controlling unit is limited to 1 up and down, the positive and negative amplitude of triangular wave is also 1,
Active power consumption controls, when electrical network generation voltage dip fault, blower fan bus disconnects the connection with electrical network, it is meritorious directly through low voltage crossing comprehensive regulation device that blower fan sends, in vertical compression side, energy consumption resistor place consumes, and controlled by IGBT, regulation and control IGBT control signal, controlling resistance make-and-break time, carry out meritorious accurately consumption, energy consumption resistor IGBT control signal is primarily of height, low level pulse signal and triangle wave obtain, when being located at fault, high level signal and triangular wave contrast, along with the change of high level size, the time of break-make can be controlled, when high level signal size is 1 always, control signal is l always, IGBT continues open-minded, energy consumption resistor is gained merit with full power consumption, when high level signal size reduces, just there will be pulse-modulated signal with after triangle wave, is no longer full power operation, controls along with meritorious size variation, adjustment high level signal size.
5. wind power generation low-voltage ride-through comprehensive regulation device as claimed in claim 4, it is characterized in that, also comprise DC side protective circuit, with the collaborative work of crowbar circuit, chopper circuit is increased in DC side, when grid voltage sags, rotor-side overcurrent, now drop into dump load, consume the energy that DC side is unnecessary, then voltage stabilization can be kept, increase chopper circuit in DC side further and carry out power consumption absorption, simultaneously, also energy storage device is adopted in DC side, excess energy between age at failure is stored, and after fault terminates, these energy are sent into electrical network,
A kind of brake impedance is proposed in alternating current circuit, when system jam, the series connection of wind turbine end is braked impedance, short circuit current flows through brake impedance, a part of excess power of electrical network can not be delivered to when absorbing electric network fault, thus elevator terminal voltage, prevent rotor stall, the structures in series in parallel with brake impedance by multiple switch accesses in blower fan transmission line, during normal operation, switch closes, brake impedance does not carry out work, when electric network fault or subnormal voltage operation, the brake impedance quantity needing to adopt is selected according to the output parameter of wind turbine, thus open corresponding switch and carry out power absorption.
6. wind power generation low-voltage ride-through comprehensive regulation device as claimed in claim 5, is characterized in that, after grid voltage sags, restriction inverter current is constant to protect its safe operation:
In formula
for the line voltage after Voltage Drop,
for electrical network rated voltage,
for falling rear inverter active power of output,
for the active power that inverter before grid voltage sags exports,
for inverter output current, reduce output of a generator by controller side rectifier
, make
, can keep power balance of DC side, restriction direct voltage raises, and realizes the low voltage crossing of wind power system.
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| CN105262139A (en) * | 2015-11-27 | 2016-01-20 | 云南电网有限责任公司电力科学研究院 | System for improving wind turbine generator low voltage ride through characteristics and method |
| CN106020308A (en) * | 2016-07-05 | 2016-10-12 | 国网天津市电力公司 | Method for improving low voltage ride-through capability of coal feeder |
| CN109444737A (en) * | 2018-09-11 | 2019-03-08 | 昆明理工大学 | It is a kind of meter and crow bar operating time of protection double-fed blower three short circuit current analytic method |
| CN111466073A (en) * | 2017-12-19 | 2020-07-28 | 维斯塔斯风力系统集团公司 | Method for operating a plurality of chopper circuits |
| CN111509776A (en) * | 2020-05-26 | 2020-08-07 | 广东电科院能源技术有限责任公司 | Low voltage ride through test voltage control method and device |
| CN112003257A (en) * | 2020-07-29 | 2020-11-27 | 许继集团有限公司 | Control system and method for preventing direct current energy consumption device from being refused |
| CN113890084A (en) * | 2021-09-06 | 2022-01-04 | 中国华能集团清洁能源技术研究院有限公司 | Abnormity control method, device and control system of tandem type double-wind-wheel power generation system |
| CN115800372A (en) * | 2022-12-07 | 2023-03-14 | 山东电力工程咨询院有限公司 | Direct-current bus superposition type double-fed forced excitation converter based on TAB and method |
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| CN111509776A (en) * | 2020-05-26 | 2020-08-07 | 广东电科院能源技术有限责任公司 | Low voltage ride through test voltage control method and device |
| CN112003257A (en) * | 2020-07-29 | 2020-11-27 | 许继集团有限公司 | Control system and method for preventing direct current energy consumption device from being refused |
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| CN115800372A (en) * | 2022-12-07 | 2023-03-14 | 山东电力工程咨询院有限公司 | Direct-current bus superposition type double-fed forced excitation converter based on TAB and method |
| CN115800372B (en) * | 2022-12-07 | 2023-06-23 | 山东电力工程咨询院有限公司 | Direct-current bus superposition type doubly-fed forced excitation converter and method based on TAB |
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