CN104242342A - Generation system mechanical stepless converter and control method thereof - Google Patents
Generation system mechanical stepless converter and control method thereof Download PDFInfo
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- CN104242342A CN104242342A CN201410471024.5A CN201410471024A CN104242342A CN 104242342 A CN104242342 A CN 104242342A CN 201410471024 A CN201410471024 A CN 201410471024A CN 104242342 A CN104242342 A CN 104242342A
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Abstract
The invention discloses a generation system mechanical stepless converter and a control method of the generation system mechanical stepless converter, and belongs to the technical field of power generation. The generation system mechanical stepless converter and the control method of the generation system mechanical stepless converter are used for frequency control of output power of a generator unit. The generation system mechanical stepless converter is wide in frequency adjustment range, low in cost, high in overload capacity and low in fault rate. The generation system mechanical stepless converter comprises a CVT, wherein the output end of a prime mover system is connected with the input end of the CVT, the output end of the CVT is connected wit the input end of the generator unit, and the output end of the generator unit is connected with a power grid through a transformer; a rotation speed sensor is arranged on an output shaft of the CVT or an input shaft of the generator unit, the output end of the rotation speed sensor is connected with the input end of a controller, and the output end of the controller is connected with a speed ratio driver of the CVT. According to the control method, the controller controls the speed ration variation of the CVT according to the detected variation of the rotation speed of the output shaft of the CVT, and therefore the connect-in rotation speed of the generator unit keeps constant.
Description
Technical field
The invention belongs to technical field of power generation, particularly relate to a kind of electricity generation system mechanical stepless converter and control method thereof, for the FREQUENCY CONTROL of generating set output power.
Background technology
According to the difference of source motivation, electricity generation system can carry out following classification:
(1) turbo generator: by Steam Turbine Driven, is generally horizontal, and rotor is hidden pole type;
(2) hydraulic generator: driven by the hydraulic turbine, is generally vertical for large and medium-sized hydraulic generator, and rotor is salient pole type;
(3) nuclear energy generator: with conventional thermal power plant turbo generator without essential distinction, has full speed and Half Speed two kinds;
(4) gas turbine generator: be expand after gas compression, heating in turbine is the rotary power machinery of mechanical energy its thermal power transfer;
(5) solar generator: be utilize solar irradiation on the semiconductors such as silicon, the photoelectric effect that the photon impact atomic time produces, directly becomes the generation mode of electric energy by transform light energy;
(6) wind-driven generator: wind power generation need be realized by control device in time according to the change of wind-force size and electric energy demand;
(7) diesel engine generator: be made up of diesel engine and generator, by diesel-driven generating set.The multiple occasion such as industrial and mining enterprises, shipping vehicle is used for usually used as independent current source or stand-by power supply.
But no matter which kind of electricity generation system, the output power of electricity generation system for driving load object or linking up with public electric wire net (can think that electrical network is exactly much need the load object of electricity consumption), then will must meet following four conditions:
1. the frequency of generator is identical with user's (or electrical network) system frequency;
2. generator outlet voltage is identical with user's (or electrical network) system voltage, and its worst error should within 5%;
3. generator phase sequence is identical with user's (or electrical network) system phase sequence;
4. generator voltage phase place is consistent with user's (or electrical network) system voltage phase place.
Wherein, of paramount importance is exactly the control of FREQUENCY CONTROL to generating set and outlet voltage.
The outlet voltage of generating set is controlled by its excitation system (AVR), and the frequency of output power is then determined by electric generating set rotor speed.
The fluctuation of electricity generation system source motivation power output can increase the difficulty of electricity generation system frequency modulation, and the change of electricity generation system frequency can affect the running status of source motivation unit conversely.All power supply connecting systems all require that source motivation unit output shaft normally can run in certain range of speeds, and rotating speed then needs forced partial outage to run or postpone certain hour backed off after random to run, with the frequency stabilization of maintenance system after exceeding certain limit.Many State Grid Corporation of China require that electric field is adjusted by 3% ~ 5% frequency participating in system controlling power output.
Conventional electric power generation unit maintenance system requires that the output speed of source motivation unit is substantially constant, when the output speed fluctuation of load variations or source motivation unit, the method of its frequency stabilization is mainly finely tuned by the turbine blade inclination angle of adjustment source motivation, to ensure stable (as shown in Figure 1) of generating set access rotating speed; If because load variations is excessive etc. reason make systems generate electricity unit access rotating speed too high time, then part source motivation compressor emergency shutdown can only be made to control to reduce the power output of electric field by control system.
Modern many small power generation units or grid-connected power generation system then normally adopt the power conversion systems such as ac-dc-ac frequency control to realize the FREQUENCY CONTROL (as shown in Figure 2) of generating set output power.And due to technology, current power conversion system is mainly from external import, even if there is the power conversion system that minority domestic manufacturer manufactures, the major power components and parts that it adopts are all almost the components and parts from external import; And these power component overload capacity are low, failure rate is high, very easily damages.
Automatically controlled metal tape (chain) formula mechanical stepless transmission (Continuously Variable Transmission, be called for short CVT) be mainly used for motion or the power transmission aspect of automobile at present, though be fricting transmissioning mode, its transmitting torque is increasing, can reach nearly 700Nm, more than rotating speed 6000rpm at present.But along with the development of technology and the increasing of research dynamics, the ability of CVT transmission motion or power will have and constantly improve.
Summary of the invention
For prior art Problems existing, the invention provides that a kind of tuning range is large, cost is low, overload capacity is strong, the electricity generation system mechanical stepless converter of failure rate is low and control method thereof.
To achieve these goals, the present invention adopts following technical scheme, a kind of electricity generation system mechanical stepless converter, comprise CVT, the output of source motivational system is connected with the input of CVT, the output of CVT is connected with the input of generating set, and the output of generating set is connected with electrical network through transformer; The output shaft of CVT or the power shaft of generating set are provided with speed probe, and the output of speed probe is connected with the input of controller, and the output of controller is connected with the speed ratio driver of CVT.
Between the output and the input of CVT of described source motivational system, be provided with raising speed gear train, the gear control end of raising speed gear train is connected with the output of controller.
The control method of described electricity generation system mechanical stepless converter, the speed ratio change of the corresponding control CVT of change of the CVT output shaft rotating speed that controller detects according to speed probe, thus ensure that generating set access rotating speed keeps constant.
Beneficial effect of the present invention:
Electricity generation system mechanical stepless converter of the present invention and control method tuning range is large, cost is low, overload capacity is strong, and failure rate is low, not fragile.
Accompanying drawing explanation
Fig. 1 is that conventional electric power generation unit maintenance system opens up benefit structural representation;
Fig. 2 is that Modern Small generating set or grid-connected power generation system open up benefit structural representation;
Fig. 3 is that benefit structural representation opened up by electricity generation system mechanical stepless converter of the present invention;
In figure, 1-source motivational system, 2-raising speed gear train, 3-generating set, 4-soft starter, 5-electrical network, 6-CVT, 7-controller, 8-speed probe, 9-transformer.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 3, a kind of electricity generation system mechanical stepless converter, comprise CVT6, the output of source motivational system 1 is connected with the input of CVT6, the output of CVT6 is connected with the input of generating set 3, and the output of generating set 3 is connected with electrical network 5 through transformer 9; The output shaft of CVT6 or the power shaft of generating set 3 are provided with speed probe 8, the output of speed probe 8 and controller 7 (Transmission Control Unit, be called for short TCU) input be connected, the output of controller 7 is connected with the speed ratio driver of CVT6.Between the output and the input of CVT6 of described source motivational system 1, be provided with raising speed gear train 2, the gear control end of raising speed gear train 2 is connected with the output of controller 7.
The control method of described electricity generation system mechanical stepless converter, the speed ratio change of the corresponding control CVT6 of change of the CVT6 output shaft rotating speed (namely generating set 3 accesses rotating speed) that controller 7 detects according to speed probe 8, thus ensure that generating set 3 accesses rotating speed and keeps constant.
The present invention adopts automatically controlled metal tape (chain) formula mechanical stepless transmission CVT as generating set frequency changer, controls generating set access rotating speed link to realize the stable of the frequency of output power by it.
Raising speed gear train 2 can realize raising speed and subtract the function turned round, and reduces the demand to CVT transmitting torque, also ensure that the demand of electricity generation system to CVT input speed.If source motivational system 1 output speed change little (slewing range of current CVT is between 4 ~ 6), and output speed meets the requirement of CVT input speed, then can remove raising speed gear train 2; If source motivational system 1 operating mode is complicated, raising speed gear train 2 very greatly, then can be manufactured multi-speed gear box by output speed change.
Claims (3)
1. an electricity generation system mechanical stepless converter, is characterized in that comprising CVT, and the output of source motivational system is connected with the input of CVT, and the output of CVT is connected with the input of generating set, and the output of generating set is connected with electrical network through transformer; The output shaft of CVT or the power shaft of generating set are provided with speed probe, and the output of speed probe is connected with the input of controller, and the output of controller is connected with the speed ratio driver of CVT.
2. electricity generation system mechanical stepless converter according to claim 1, it is characterized in that being provided with raising speed gear train between the output and the input of CVT of described source motivational system, the gear control end of raising speed gear train is connected with the output of controller.
3. the control method of electricity generation system mechanical stepless converter according to claim 1, it is characterized in that the speed ratio change of the corresponding control CVT of change of the CVT output shaft rotating speed that controller detects according to speed probe, thus ensure that generating set access rotating speed keeps constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410471024.5A CN104242342A (en) | 2014-09-15 | 2014-09-15 | Generation system mechanical stepless converter and control method thereof |
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| CN201410471024.5A CN104242342A (en) | 2014-09-15 | 2014-09-15 | Generation system mechanical stepless converter and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779862A (en) * | 2015-04-17 | 2015-07-15 | 宁波博生机电科技有限公司 | Transient control system and method for constant speed regulating system of generator |
| CN108131172A (en) * | 2017-12-20 | 2018-06-08 | 赵连新 | A kind of turbine operating efficiency self-checking device and adjusting method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100694485B1 (en) * | 2005-01-11 | 2007-03-13 | (주) 피에스디테크 | Hybrid generation system using solar light and wind power |
| CN203335328U (en) * | 2013-06-04 | 2013-12-11 | 中国石油大学(华东) | Small-sized stepless speed change type self-speed-regulating wind driven generator |
-
2014
- 2014-09-15 CN CN201410471024.5A patent/CN104242342A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100694485B1 (en) * | 2005-01-11 | 2007-03-13 | (주) 피에스디테크 | Hybrid generation system using solar light and wind power |
| CN203335328U (en) * | 2013-06-04 | 2013-12-11 | 中国石油大学(华东) | Small-sized stepless speed change type self-speed-regulating wind driven generator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779862A (en) * | 2015-04-17 | 2015-07-15 | 宁波博生机电科技有限公司 | Transient control system and method for constant speed regulating system of generator |
| CN108131172A (en) * | 2017-12-20 | 2018-06-08 | 赵连新 | A kind of turbine operating efficiency self-checking device and adjusting method |
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Application publication date: 20141224 |