CN201805236U - Series type LVRT (low voltage ride through) control device of wind generating set - Google Patents
Series type LVRT (low voltage ride through) control device of wind generating set Download PDFInfo
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- CN201805236U CN201805236U CN2010201925346U CN201020192534U CN201805236U CN 201805236 U CN201805236 U CN 201805236U CN 2010201925346 U CN2010201925346 U CN 2010201925346U CN 201020192534 U CN201020192534 U CN 201020192534U CN 201805236 U CN201805236 U CN 201805236U
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Abstract
The utility model relates to a utility series-type LVRT (low voltage ride through) control device of a wind generating set, and a control method as well. The series type LVRT control device not only is applicable to a new generating set, but also can be applied in the LVRT function modification of a commissioned generating set. When the power network has low-voltage faults, a system can fast output balanced voltage to compensate network voltage sags and enable the observed voltage at the port of a power generator to be stabilized, thereby enabling the wind generating set to achieve the LVRT capability; and as required, the system can provide a certain reactive power to the power network, avoid oscillation which possibly arises in the switching process of working modes, ensure safe and reliable operation of mechanical parts of the generating set and prolong the service life of the generating set.
Description
Technical field
The utility model relates to the wind turbine generator low-voltage and passes through control technology, belongs to the generation of electricity by new energy technical field.
Background technology
In a period of time in future, along with the world and development of Chinese economy, the consumption of the energy will sharply increase, yet because the consumption of the scarcity relatively of china natural resources and non-renewable resources is for environment damage, make China will be faced with the dual-pressure of environment and resource for a long time in following a period of time, development comprises that the regenerative resource of wind power generation is the ultimate solution of China's energy predicament.At the actual conditions of Chinese development wind-powered electricity generation, the coordinated planning of wind energy turbine set and electrical network and construction are the problems of current most critical.Because wind energy is a kind of can not artificially control and the extremely unsettled energy, off and on, how wind energy development is come out to be connected to the grid, guarantee the operation of electricity net safety stable ground, this is a urgent problem.Therefore, continuous increase along with wind-powered electricity generation proportion in the electrical network, countries in the world had proposed than higher in the past specification requirement the grid connected wind power unit when improving electrical network wind-powered electricity generation ability to bear, passed through (LVRT) ability, meritorious and Reactive Power Control ability etc. as low-voltage.Wherein, the low voltage ride-through capability of wind-powered electricity generation unit is the ultimate challenge of wind-powered electricity generation unit design and manufacturing technology.The low voltage ride-through capability of wind-driven generator is meant in wind-powered electricity generation unit terminal voltage during the electric network fault to be reduced under the situation of certain value, and the wind-powered electricity generation unit can keep the ability that is incorporated into the power networks and runs without interruption in the certain hour scope.Some leading countries of wind-powered electricity generation development have at present formulated new wind-electricity integration guide rule in succession, have quantitatively provided the condition of wind-powered electricity generation unit off-grid.
For dissimilar wind-powered electricity generation units, the implementation method of its LVRT function is also different.The measure that is used for improving the LVRT ability at present mainly contains propeller pitch angle control, rotor quickens control, stator Crowbar control, rotor Crowbar control and dynamic passive compensation etc.But, double fed asynchronous machine (DFIG) rotor moves as cage induction motor after inserting the Crowbar device, become one and consume the idle load of perception, not only can not play the support effect to line voltage, hinder the recovery of line voltage behind the failure removal on the contrary, the switching between the different running statuses of DFIG needs comparatively complicated control logic in addition, otherwise can cause bigger oscillatory process, influence the safe operation of mechanical parts such as power transmission shaft, gear box and bearing and reduce useful life.In electrical network, installed advanced dynamic reactive compensation device (SVC, STATCOM, DVR etc.) additional, make the asynchronous unit of constant speed of LVRT poor-performing also possess certain LVRT ability, but the economy of dynamic reactive compensation device has been relatively poor.
The wind-electricity integration guide rule of China is ready to appear, the wind-powered electricity generation unit that development has a LVRT function has become domestic wind-powered electricity generation complete machine producer compels in as pressing as a fire singeing one's eyebrows task, therefore, develop a kind of suitable type widely low-voltage pass through control device, both can be used for new unit, the low-voltage of unit of can being used for again having put into operation is passed through function modifications, can improve the stability that contains the wind energy turbine set electrical network, make the cost and the environment-friendly advantage of wind-powered electricity generation obtain practical embodiment, this will greatly promote the development and use scale of this regenerative resource of wind power generation undoubtedly, drive domestic relevant wind power plant and make the development of industry, the healthy and rapid development of national economy is played an important role.
Summary of the invention
Technical problem: the purpose of this utility model be to provide a kind of suitable type widely tandem type wind turbine generator low-voltage pass through control device, make it both can be used for new unit, the low-voltage of unit of can being used for again having put into operation is passed through function modifications, under the situation of electrical network generation low voltage failure, system can export balanced voltage falling with compensation network voltage fast, make the observed voltage of generator port basicly stable, thereby make wind turbine generator have the ability that low-voltage is passed through, system also can provide certain reactive power to electrical network as required, and avoid issuable oscillatory process in the work-mode switching process, guarantee the safe and reliable operation of generating set mechanical part, increase the service life.
Technical scheme: a kind of tandem type wind turbine generator low-voltage of the present utility model is passed through control device and is comprised coupling transformer, pwm converter, storage capacitor, discharging circuit and controller, wherein: the former edge joint of coupling transformer is in generator and step-up transformer loop, the secondary of coupling transformer is connected with pwm converter, pwm converter direct current side joint storage capacitor and discharging circuit, the control end of controller connects pwm converter, discharging circuit respectively; This low-voltage is passed through between the low-pressure end that control device is serially connected with generator and step-up transformer.
Described discharging circuit comprises: power device and resistance, and the control end of the output termination power device of the discharging circuit control in the controller, after power device and resistance were connected in series, the other end of its resistance and the other end of power device connect pwm converter respectively.
The concrete form of described power device is thyristor or insulated gate bipolar transistor.
The control method that the wind power generation low-voltage is passed through control device is: measure the real-time voltage of step-up transformer low-pressure side continuously and compare with the mould and the phase angle of normal condition magnitude of voltage by controller, if deviation reaches the degree that low voltage failure has taken place electrical network, controller will be regulated pwm converter that low-voltage passes through control device and come electric voltage dropping on the compensation network, generator voltage is maintained certain level, thereby the realization low-voltage is passed through; Direct voltage and set point that controller is monitored DC side storage capacitor two ends simultaneously compare, if direct voltage raises and surpasses limit value, the power device that controller triggers discharging circuit is reduced in the safe scope to regulate direct voltage.
Beneficial effect: advantage of the present utility model is: the wind-powered electricity generation unit low-voltage that series connection inserts between aerogenerator stator and transformer is passed through control device, by the real-time voltage comparison normal condition of continuous measurement fixing point
The mould and the phase angle of pressure value are operated, in case break down on network, system comes the loss of voltage on the compensating network with operation compensation device, thereby voltage is maintained certain level.Extra gaining merit makes not off-grid operation of generator in the network thereby this device can absorb under failure condition, also can dispose according to the user, the reactive power that output needs, with guarantee fault between the emergence period wind-driven generator do not need off-grid, make wind turbine generator have the ability that low-voltage is passed through, and avoid issuable oscillatory process in the work-mode switching process, guarantee the safe and reliable operation of generating set mechanical part, increase the service life.Used vector control technology in the pwm converter control, taken place on electrical network in the disturbance, no matter grid balance is with uneven, can control output voltage, thus support generator, guarantee that generator normally is incorporated into the power networks.Because low-voltage is passed through control device and is serially connected between generator unit stator and the step-up transformer low-pressure side, this device both can be fixed on installs tower tube the inside, perhaps in tower tube the inside extra fixed platform is installed, also can be installed in tower tube outside or transformer room, it is quite convenient therefore to use.Low-voltage is passed through principle and the structure that control device does not change former wind turbine control system, therefore go for dissimilar units, mainly comprise the mouse cage asynchronous generator of constant speed, double-fed asynchronous generator, Opti-slip asynchronous generator etc., have advantages such as wide adaptability, shock loading be little, this device both can become one of the wind-powered electricity generation unit independently low-voltage pass through functional module, the old unit low-voltage that can be used for being incorporated into the power networks in electrical network is again passed through the transformation of function.
Description of drawings
Fig. 1 has the wind generator system figure that low-voltage is passed through control device;
Fig. 2 passes through the control device structure chart for low-voltage;
Fig. 3 passes through control device control principle figure for low-voltage.
Have among the figure: coupling transformer 1, pwm converter 2, storage capacitor 3, discharging circuit 4, power device 41, resistive element 42, controller 5, discharging circuit control 51, pwm converter control 52, generator 6, step-up transformer 7, voltage transformer 8, current transformer 9.
Embodiment
The tandem type low-voltage is passed through control device, comprise coupling transformer, pwm converter, storage capacitor, discharging circuit and controller, low-voltage is passed through between the low-pressure end that control device is serially connected with generator and step-up transformer, in system: the former edge joint of coupling transformer is in generator and step-up transformer loop, the secondary of coupling transformer is connected with pwm converter, the pwm converter DC side is connected with storage capacitor, and storage capacitor is connected with discharging circuit; Discharging circuit comprises: power device and resistive element, power device and resistive element are connected in series.
In the utility model: described wind power generation low-voltage pass through control device by controller measure continuously the step-up transformer low-pressure side real-time voltage and and the mould and the phase angle of normal condition magnitude of voltage compare, if it is that low voltage failure has taken place electrical network that deviation acquires a certain degree, controller will be regulated pwm converter that low-voltage passes through control device and come electric voltage dropping on the compensation network, generator voltage is maintained certain level, thereby the realization low-voltage is passed through; Direct voltage and set point that controller is monitored DC side storage capacitor two ends simultaneously compare, if direct voltage raises and surpasses limit value, the power device that controller triggers discharging circuit is reduced in the safe scope to regulate direct voltage.
In the utility model: described controller comprises discharging circuit control and pwm converter control.
DC side storage capacitor two ends direct voltage measured value U
DcWith direct voltage set point U
Dc_refObtain deviation signal Δ U through comparing element
Dc, send into comparator behind deviation signal process proportional integral (PI) adjuster, generate the conducting duty ratio of power controlling device, the turn-on and turn-off of power controlling device, thus regulate dc voltage value near set point.
Vector control technology is adopted in power inverter control, electrical network is connected with the step-up transformer high-pressure side, the step-up transformer low-pressure end is connected with the coupling transformer that low-voltage is passed through control device, three phase network voltage at first carries out the abc/dq coordinate transform after the step-up transformer low-pressure end detects, obtain d-axis (d axle) the component u of three-phase voltage respectively
dWith friendship axle (q axle) component u
q, to u
dAnd u
qCarrying out positive-negative sequence calculates, can obtain the positive sequence component and the negative sequence component of d axle component, the d axle positive-negative sequence component of this actual measurement and given d axle positive-negative sequence component are sent into the voltage comparing element and are compared, wherein d axle negative sequence component set-point is 0, respectively the deviation signal of d axle positive sequence component and negative sequence component is sent into pi regulator and generates d axle positive sequence reference voltage
With d axle negative phase-sequence reference voltage
The negative phase-sequence reference voltage
Multiply by factor e
-j2 ω tBack and positive sequence reference voltage
Obtain d axle reference voltage after the addition
Given reactive power value passing ratio link obtains required friendship axle reference current
The pwm converter three-phase alternating current that measures is carried out the abc/dq coordinate transform obtain d shaft current component i
dWith q shaft current component i
q, actual measurement q shaft current component i
qWith a friendship axle reference current
Send into comparing element and deviation signal is sent into pi regulator, obtain q axle reference voltage
D axle reference voltage
With q axle reference voltage
Send into the SVPWM modulator together, can produce the required PWM modulating wave of pwm converter operation.
Accompanying drawing discloses the concrete structure of the utility model embodiment without limitation, and the utility model is described in further detail below in conjunction with accompanying drawing.
As seen from Figure 1, contain the wind generator system that low-voltage is passed through control device, its connected mode is: low-voltage is passed through between the low-pressure end that control device is serially connected with generator unit stator winding output and step-up transformer.
As seen from Figure 2, low-voltage is passed through control device and is comprised: coupling transformer, pwm converter, storage capacitor, discharging circuit and controller, its concrete connected mode is: the former edge joint of coupling transformer is in generator and step-up transformer loop, the secondary of coupling transformer is connected with pwm converter, the pwm converter DC side is connected with storage capacitor, and storage capacitor is connected with discharging circuit.The controller that low-voltage is passed through control device comprises: discharging circuit control and pwm converter control, and discharging circuit control is connected with discharging circuit, and pwm converter control is connected with pwm converter.
As seen from Figure 3, discharging circuit comprises: power device and resistive element, its concrete connected mode is: power device and resistive element are connected in series.Power device and resistive element parameter will suitably be chosen according to generator type, amount of capacity, the guide rule that is incorporated into the power networks regulation and electric pressure.
During work, measure DC side storage capacitor two ends direct voltage U
DcAnd with direct voltage set point U
Dc_refAt comparing element relatively, obtain deviation signal Δ U
Dc, this deviation signal is sent into comparator through behind the pi regulator, generates the conducting duty ratio of power controlling device, the turn-on and turn-off of power controlling device, thus regulate dc voltage value near set point.
Vector control technology is adopted in power inverter control, electrical network is connected with the step-up transformer high-pressure side, the step-up transformer low-pressure end is connected with the coupling transformer that low-voltage is passed through control device, three phase network voltage at first carries out the abc/dq coordinate transform after the step-up transformer low-pressure end detects, obtain d-axis (d axle) the component u of three-phase voltage respectively
dWith friendship axle (q axle) component u
q, to u
dAnd u
qCarrying out positive-negative sequence calculates, can obtain the positive sequence component and the negative sequence component of d axle component, the d axle positive-negative sequence component of this actual measurement and given d axle positive-negative sequence component are sent into the voltage comparing element and are compared, wherein d axle negative sequence component set-point is 0, respectively the deviation signal of d axle positive sequence component and negative sequence component is sent into pi regulator and generates d axle positive sequence reference voltage
With d axle negative phase-sequence reference voltage
The negative phase-sequence reference voltage
Multiply by factor e
-j2 ω tBack and positive sequence reference voltage
Obtain d axle reference voltage after the addition
Given reactive power value passing ratio link obtains required friendship axle reference current
The pwm converter three-phase alternating current that measures is carried out the abc/dq coordinate transform obtain d shaft current component i
dWith q shaft current component i
q, actual measurement q shaft current component i
qWith a friendship axle reference current
Send into comparing element and deviation signal is sent into pi regulator, obtain q axle reference voltage
D axle reference voltage
With q axle reference voltage
Send into the SVPWM modulator together, can produce the required PWM modulating wave of pwm converter operation.
Claims (4)
1. a tandem type wind turbine generator low-voltage is passed through control device, it is characterized in that this low-voltage passes through control device and comprise coupling transformer (1), pwm converter (2), storage capacitor (3), discharging circuit (4) and controller (5), wherein: the former edge joint of coupling transformer is in generator (6) and step-up transformer (7) loop, the secondary of coupling transformer (1) is connected with pwm converter (2), pwm converter (2) direct current side joint storage capacitor (3) and discharging circuit (4), the control end of controller (5) connects pwm converter (2) respectively, discharging circuit (4); This low-voltage is passed through between the low-pressure end that control device is serially connected with generator (6) and step-up transformer (7).
2. tandem type wind turbine generator low-voltage according to claim 1 is passed through control device, it is characterized in that described discharging circuit (4) comprising: power device (41) and resistance (42), the control end of the output termination power device (41) of the discharging circuit control (51) in the controller (5), after power device (41) was connected in series with resistance (42), the other end of the other end of its resistance (42) and power device (41) connect pwm converter (2) respectively.
3. tandem type wind turbine generator low-voltage according to claim 1 is passed through control device, and the concrete form that it is characterized in that described power device (41) is a thyristor.
4. tandem type wind turbine generator low-voltage according to claim 1 is passed through control device, it is characterized in that described thyristor is an insulated gate bipolar transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201925346U CN201805236U (en) | 2010-05-17 | 2010-05-17 | Series type LVRT (low voltage ride through) control device of wind generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201925346U CN201805236U (en) | 2010-05-17 | 2010-05-17 | Series type LVRT (low voltage ride through) control device of wind generating set |
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| Publication Number | Publication Date |
|---|---|
| CN201805236U true CN201805236U (en) | 2011-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201925346U Expired - Lifetime CN201805236U (en) | 2010-05-17 | 2010-05-17 | Series type LVRT (low voltage ride through) control device of wind generating set |
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| CN (1) | CN201805236U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860043A (en) * | 2010-05-17 | 2010-10-13 | 东南大学 | Low voltage traversing control device and method for serial connection wind power generator set |
| CN103107555A (en) * | 2012-12-27 | 2013-05-15 | 深圳创动科技有限公司 | Photovoltaic inverter and low voltage ride-through control method thereof |
| CN103346571A (en) * | 2013-07-17 | 2013-10-09 | 深圳供电局有限公司 | Method and device for controlling microgrid adapting to power grid requirements |
| CN103560524A (en) * | 2013-11-18 | 2014-02-05 | 国家电网公司 | Low voltage ride-through system and method of double-fed asynchronous wind generating unit based on dynamic voltage restorer (DVR) |
| CN104734186A (en) * | 2012-12-27 | 2015-06-24 | 深圳创动科技有限公司 | Photovoltaic inverter and low voltage ride through control method thereof |
| CN108923466A (en) * | 2018-08-14 | 2018-11-30 | 国电联合动力技术有限公司 | A kind of double mode of Wind turbines is incorporated into the power networks control method and system |
-
2010
- 2010-05-17 CN CN2010201925346U patent/CN201805236U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860043A (en) * | 2010-05-17 | 2010-10-13 | 东南大学 | Low voltage traversing control device and method for serial connection wind power generator set |
| CN101860043B (en) * | 2010-05-17 | 2012-09-19 | 东南大学 | Low voltage traversing control device and method for serial connection wind power generator set |
| CN103107555A (en) * | 2012-12-27 | 2013-05-15 | 深圳创动科技有限公司 | Photovoltaic inverter and low voltage ride-through control method thereof |
| CN104734186A (en) * | 2012-12-27 | 2015-06-24 | 深圳创动科技有限公司 | Photovoltaic inverter and low voltage ride through control method thereof |
| CN104734186B (en) * | 2012-12-27 | 2018-06-19 | 深圳创动科技有限公司 | Photovoltaic DC-to-AC converter and its low voltage ride through control method |
| CN103346571A (en) * | 2013-07-17 | 2013-10-09 | 深圳供电局有限公司 | Method and device for controlling microgrid adapting to power grid requirements |
| CN103346571B (en) * | 2013-07-17 | 2015-11-11 | 深圳供电局有限公司 | A kind of microgrid control method and device adapting to electrical network demand |
| CN103560524A (en) * | 2013-11-18 | 2014-02-05 | 国家电网公司 | Low voltage ride-through system and method of double-fed asynchronous wind generating unit based on dynamic voltage restorer (DVR) |
| CN108923466A (en) * | 2018-08-14 | 2018-11-30 | 国电联合动力技术有限公司 | A kind of double mode of Wind turbines is incorporated into the power networks control method and system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110420 Effective date of abandoning: 20120919 |