CN101872983B - Load-type rapid grid connection device of small water turbine generator set - Google Patents
Load-type rapid grid connection device of small water turbine generator set Download PDFInfo
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- CN101872983B CN101872983B CN2010101977773A CN201010197777A CN101872983B CN 101872983 B CN101872983 B CN 101872983B CN 2010101977773 A CN2010101977773 A CN 2010101977773A CN 201010197777 A CN201010197777 A CN 201010197777A CN 101872983 B CN101872983 B CN 101872983B
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- water turbine
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- guide vanes
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Abstract
The invention relates to a load-type rapid grid connection device of a small water turbine generator set. The device comprises an electronic load controller, a central processing unit and a water turbine guide vane control device. The water turbine guide vane control device controls the opening of water turbine guide vanes. A frequency regulating device is simultaneously connected with the power supply line of the generator set and a grid line, is used for acquiring the current frequency fN of the generator set and the target frequency fT of the grid line and is connected with the central processing unit to transmit the current frequency fN to the central processing unit. A control program is built in the central processing unit and is used for controlling the coordination of the electronic load controller and the water turbine guide vane control device. By adopting the device, the invention has the advantages that the structure of the micro water turbine is simplified, the cost is reduced, the automation level, the power supply reliability and the power quality are improved, the great wastage of energy is avoided and the multipurpose requirements of users can be satisfied.
Description
Technical field
The present invention relates to a kind of load-type rapid grid connection device of small water turbine generator set.
Background technology
Utilize the small hydro turbine group can hydraulic power potentials be converted into the energy--the electric energy of cleaning, supply people to produce and the life use, this all has great importance to developing the economy, protect environment and strengthening national defense construction.But the load meeting that connects for the output of minitype wheel generator group often changes, and causes the electric voltage frequency of generator output unstable.For this reason, Chinese utility model patent (patent No. is 200920112513.6) discloses the electron load regulator of small hydro turbine group, and this device comprises frequency regulator, resistance wire, phase shift trigger and solid-state relay; Frequency regulator inserts the machine frequency that the electric set electric supply circuit is gathered generator; Insert power network line collection net frequently; The output of frequency regulator connects phase shift trigger, in frequency regulator, will net frequency and machine and compare frequently, and output analog quantity control voltage is given phase shift trigger; Resistance wire be connected in parallel in the supply line after solid-state relay is connected, solid-state relay is connected with phase shift trigger, the conduction ratio of phase shift trigger control solid-state relay is realized the power adjustments of resistance wire.This patent both can make the designs simplification of micro hydraulic turbine, cost descend, and improved automatization level, power supply reliability and the quality of power supply simultaneously, to satisfy the multiduty requirement of user.In addition, utilize the load autoregulation of electron load regulator to constitute the Load Regulation cabinet, can stabilize the fluctuation of Hydropower Unit load, greatly improve the job stability of Hydropower Unit when lonely network operation, and prolong the time between overhauls(TBO) and the working life of unit.
But the technology of this patent is applicable to the fine setting of frequency; Frequently there is bigger gap for net frequency and machine; A large amount of resistance wires just need be set in theory be used for consumed energy, so not only the difficulty that exists is gone up in operation, and can cause a large amount of losses to the energy.
Summary of the invention
Only be applicable to the technological deficiency of frequency trim for the electron load regulator that solves above-mentioned small hydro turbine group; The purpose of this invention is to provide a kind of load-type rapid grid connection device of small water turbine generator set; This device can be adjusted big difference on the frequency; Make output frequency stable, avoided a large amount of losses of the energy simultaneously again.
In order to realize above-mentioned purpose, the technical scheme below the present invention has adopted:
Load-type rapid grid connection device of small water turbine generator set; This device comprises electronics load governor, central processing unit and guide vanes of water turbine control device; The electronics load governor comprises frequency modulation device, phase shift trigger, solid-state relay and resistance wire, guide vanes of water turbine control device control guide vanes of water turbine aperture; Frequency modulation device inserts electric set electric supply circuit and power network line simultaneously, gathers the current frequency values f in the generating set
NTarget frequency f with power network line
T, frequency modulation device connects described central processing unit, with current frequency values f
NFlow to central processing unit; Central processing unit connects control guide vanes of water turbine control device and electronics load governor; Central processing unit is built-in with control program; Control program setpoint frequency value 48～52 hertz with in be electron load regulator and guide vanes of water turbine control device unite the adjusting operation interval, and the step of control program below carrying out:
(1) if the current frequency values f of generating set
NWhen being lower than 48 hertz, electron load regulator does not drop into resistance wire work, and the guide vanes of water turbine control device slowly increases the guide vanes of water turbine aperture simultaneously; As the current frequency values f of generating set
NWhen being higher than 52 hertz, the work of electron load regulator all-in resistance silk, the guide vanes of water turbine control device reduces the guide vanes of water turbine aperture fast simultaneously;
(2) if the current frequency values f of generating set
NUniting in the adjusting operation interval frequency modulation target frequency f in uniting between regulatory region
T, current frequency values f
NGreater than target frequency f
TThen need increase resistance wire consumed power value P
C, current frequency f
NLess than target frequency f
TThen need reduce resistance wire consumed power value P
CCurrent frequency values f
NWith target frequency f
TThe absolute value part of difference | f
T-f
N| multiply by coefficient n, add current frequency values f
NWith last frequency f
N-1Difference promptly | f
T-f
N| * n+ (f
N-f
N-1) as resistance wire consumed power value P
CResistance wire consumed power value P
CWith the resistance wire total power value P that installs
TRatio P
C/ P
TLess than 25%, then increase guide vane opening through the guide vanes of water turbine control device; Ratio P
C/ P
TGreater than 75%, then reduce guide vane opening through the guide vanes of water turbine control device.
As preferably, the output of above-mentioned frequency modulation device is also connected to phase shift trigger, in frequency modulation device with current frequency values f
NWith target frequency f
TCompare; Output analog quantity control voltage is given phase shift trigger, resistance wire be connected in parallel in the supply line after solid-state relay is connected, solid-state relay is connected with phase shift trigger; The conduction ratio of phase shift trigger control solid-state relay, the power adjustments of realization resistance wire.
As further improvement, above-mentioned frequency modulation device comprises signal conditioning circuit, signaling conversion circuit and the single-chip microcomputer that connects successively, and signal conditioning circuit is with current frequency values f
NWith target frequency f
TBe organized into square wave respectively, the two-way square wave is exported to signaling conversion circuit, and signaling conversion circuit converts the two-way square wave to interrupt signal respectively; Interrupt signal is exported to single-chip microcomputer, and timer is left in single-chip microcomputer inside, calculates twice triggered time at interval; The calculated rate value; According to the time difference of twice frequency, calculate phase angle then, through D/A port output analog quantity control voltage.
As preferably, above-mentioned analog quantity control voltage is 0～5V.
As further improvement, above-mentioned frequency modulation device has the RS485 communication interface, adopts the MODBUS communications protocol, carries out data interaction with central processing unit.
As further improvement, above-mentioned is parallel with resistance wire through hand switch in addition in supply line.
As further improvement, the step below above-mentioned control program is carried out: it was an output cycle with 15 seconds that each increase perhaps reduces guide vane opening, and export step-length is 5% at every turn.
The present invention both can make the designs simplification of micro hydraulic turbine, cost descend owing to adopted above technical scheme, improved automatization level, power supply reliability and the quality of power supply simultaneously, had avoided a large amount of losses of the energy, can satisfy the multiduty requirement of user.
Description of drawings
Fig. 1 is a system block diagram of the present invention.
Fig. 2 is the system block diagram of frequency regulator.
Embodiment
Do a detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
Load-type rapid grid connection device of small water turbine generator set as shown in Figure 1; This device comprises electronics load governor, central processing unit 7 and guide vanes of water turbine control device 14; The electronics load governor comprises frequency modulation device 3, phase shift trigger 4, solid-state relay 5 and resistance wire 6; It is 20062010916.9 the described hydraulic turbine hydroman of utility model that the guide vanes of water turbine control device 14 control hydraulic turbines 1 guide vane opening, guide vanes of water turbine control device 14 can adopt the patent No.; Frequency modulation device inserts generating set 2 supply lines and power network line simultaneously, gathers the current frequency values f in the generating set 2
NTarget frequency f with power network line
T, target frequency f
TBe 50HZ, frequency modulation device connects described central processing unit 7, with current frequency values f
NFlow to central processing unit 7; Central processing unit 7 connects control guide vanes of water turbine control device 14 and electronics load governor; Central processing unit 7 is built-in with control program; Control program setpoint frequency value 48～52 hertz with in be electron load regulator and guide vanes of water turbine control device 14 unite the adjusting operation interval, and the step of control program below carrying out:
(1) if generating set 2 current frequency values f
NWhen being lower than 48 hertz, electron load regulator does not drop into resistance wire 6 work, and guide vanes of water turbine control device 14 slowly increases the hydraulic turbine 1 guide vane opening simultaneously; As generating set 2 current frequency values f
NWhen being higher than 52 hertz, 6 work of electron load regulator all-in resistance silk, guide vanes of water turbine control device 14 reduces the hydraulic turbine 1 guide vane opening fast simultaneously;
(2) if generating set 2 current frequency values f
NUniting in the adjusting operation interval frequency modulation target frequency f in uniting between regulatory region
T, current frequency values f
NGreater than target frequency f
TThen need increase resistance wire 6 consumed power value P
C, current frequency f
NLess than target frequency f
TThen need reduce resistance wire 6 consumed power value P
CCurrent frequency values f
NWith target frequency f
TThe absolute value part of difference | f
T-f
N| multiply by coefficient n, coefficient n is 0.25 or 0.125, adds current frequency values f
NWith last frequency f
N-1Difference promptly | f
T-f
N| * n+ (f
N-f
N-1) as resistance wire 6 consumed power value P
CResistance wire 6 consumed power value P
CWith the resistance wire 6 total power value P that install
TRatio P
C/ P
TLess than 25%, then increase guide vane opening through guide vanes of water turbine control device 14; Ratio P
C/ P
TGreater than 75%, then reduce guide vane opening through guide vanes of water turbine control device 14.Too frequent for avoiding stator to move, prolonged mechanical parts service life, it was an output cycle with 15 seconds that each increase perhaps reduces guide vane opening, export step-length is 5% at every turn.
As shown in Figure 1; The output of the frequency regulator 3 of electronics load governor connects phase shift trigger 4; As shown in Figure 2, frequency regulator 3 comprises signal conditioning circuit 10, signaling conversion circuit 11 and the single-chip microcomputer 12 that connects successively, and single-chip microcomputer 12 adopts selects 8051 series for use.The current frequency values f that signal conditioning circuit 10 will be gathered
NWith target frequency f
T, being organized into square wave respectively, the two-way square wave is exported to signaling conversion circuit 11; Signaling conversion circuit 11 converts the two-way square wave to the interrupt signal ripple respectively, and the interrupt signal ripple is exported to single-chip microcomputer 12, and timer is left in single-chip microcomputer 12 inside; Calculate twice triggered time at interval, the calculated rate value is then according to time difference of twice frequency; Calculate phase angle, chopper control is given phase shift trigger 4 through D/A port one 3 output analog quantity control voltages 0～5V then.As shown in Figure 1, resistance wire 6 be connected in parallel in the supply line 9 after solid-state relay 5 is connected, solid-state relay 5 is connected with phase shift trigger 4, the conduction ratio of phase shift trigger 4 control solid-state relays 5 is realized the power adjustments of resistance wire 6.Certainly, can also be parallel with resistance wire 6 in addition through hand switch 8 in the supply line 9.Simultaneously, frequency regulator 3 has the RS485 communication interface, adopts the MODBUS communications protocol, carries out data interaction with central processing unit 7, realizes that data show and data communication.
Claims (7)
1. load-type rapid grid connection device of small water turbine generator set; It is characterized in that: this device comprises electronics load governor, central processing unit (7) and guide vanes of water turbine control device (14); The electronics load governor comprises frequency modulation device (3), phase shift trigger (4), solid-state relay (5) and resistance wire (6), guide vanes of water turbine control device (14) the control hydraulic turbine (1) guide vane opening; Frequency modulation device (3) inserts generating set (2) supply line and power network line simultaneously, gathers the current frequency values f in the generating set (2)
NTarget frequency f with power network line
T, frequency modulation device (3) connects described central processing unit (7), with current frequency values f
NFlow to central processing unit (7), central processing unit (7) connects control guide vanes of water turbine control device (14) and electronics load governor; Central processing unit (7) is built-in with control program, control program setpoint frequency value 48～52 hertz with in be electronics load governor and guide vanes of water turbine control device (14) unite the adjusting operation interval, and the step of control program below carrying out:
(1) if the current frequency values f of generating set (2)
NWhen being lower than 48 hertz, the electronics load governor does not drop into resistance wire (6) work, and guide vanes of water turbine control device (14) slowly increases the guide vanes of water turbine aperture simultaneously; As the current frequency values f of generating set (2)
NWhen being higher than 52 hertz, electronics load governor all-in resistance silk (6) work, guide vanes of water turbine control device (14) reduces the guide vanes of water turbine aperture fast simultaneously;
(2) if the current frequency values f of generating set (2)
NUniting in the adjusting operation interval frequency modulation target frequency f in uniting between regulatory region
T, current frequency values f
NGreater than target frequency f
TThen need increase resistance wire (6) consumed power value P
C, current frequency f
NLess than target frequency f
TThen need reduce resistance wire (6) consumed power value P
CCurrent frequency values f
NWith target frequency f
TThe absolute value part of difference | f
T-f
N| multiply by coefficient n, n is 0.25 or 0.125, adds current frequency values f
NWith last frequency f
N-1Difference promptly | f
T-F
N| * n+ (f
N-f
N-1) as resistance wire (6) consumed power value P
CResistance wire (6) consumed power value P
CWith resistance wire (the 6 total power value P that install
TRatio P
C/ P
TLess than 25%, then increase guide vane opening through guide vanes of water turbine control device (14); Ratio P
C/ P
TGreater than 75%, then reduce guide vane opening through guide vanes of water turbine control device (14).
2. load-type rapid grid connection device of small water turbine generator set according to claim 1 is characterized in that: the output of frequency modulation device (3) is also connected to phase shift trigger (4), in frequency modulation device (3) with current frequency values f
NWith target frequency f
TCompare; Output analog quantity control voltage is given phase shift trigger (4); Resistance wire (6) be connected in parallel in the supply line after solid-state relay (5) is connected; Solid-state relay (5) is connected with phase shift trigger (4), the conduction ratio of phase shift trigger (4) control solid-state relay (5), the power adjustments of realization resistance wire (6).
3. load-type rapid grid connection device of small water turbine generator set according to claim 2; It is characterized in that: frequency modulation device (3) comprises signal conditioning circuit (10), signaling conversion circuit (11) and the single-chip microcomputer (12) that connects successively, the current frequency values f that signal conditioning circuit (10) will be gathered
NWith target frequency f
TBe organized into square wave respectively, the two-way square wave is exported to signaling conversion circuit (11), and signaling conversion circuit (11) converts the two-way square wave to interrupt signal respectively; Interrupt signal is exported to single-chip microcomputer (12), and timer is left in single-chip microcomputer (12) inside, calculates twice triggered time at interval; The calculated rate value; According to the time difference of twice frequency, calculate phase angle then, through D/A port (13) output analog quantity control voltage.
4. load-type rapid grid connection device of small water turbine generator set according to claim 2 is characterized in that: analog quantity control voltage is 0～5V.
5. according to claim 2 or 3 or 4 described load-type rapid grid connection device of small water turbine generator set, it is characterized in that: frequency modulation device (3) has the RS485 communication interface, adopts the MODBUS communications protocol, carries out data interaction with central processing unit (7).
6. according to claim 2 or 3 or 4 described load-type rapid grid connection device of small water turbine generator set, it is characterized in that: go up in supply line (9) and be parallel with resistance wire (6) in addition through hand switch (8).
7. according to claim 1 or 2 or 3 or 4 described load-type rapid grid connection device of small water turbine generator set; It is characterized in that control program carries out by following cycle: each to increase or reduce guide vane opening be an output cycle with 15 seconds, and export step-length is 5% at every turn.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101977773A CN101872983B (en) | 2010-06-09 | 2010-06-09 | Load-type rapid grid connection device of small water turbine generator set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101977773A CN101872983B (en) | 2010-06-09 | 2010-06-09 | Load-type rapid grid connection device of small water turbine generator set |
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|---|---|
| CN101872983A CN101872983A (en) | 2010-10-27 |
| CN101872983B true CN101872983B (en) | 2012-05-09 |
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| CN2010101977773A Expired - Fee Related CN101872983B (en) | 2010-06-09 | 2010-06-09 | Load-type rapid grid connection device of small water turbine generator set |
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| CN104935188A (en) * | 2015-05-25 | 2015-09-23 | 中国海洋石油总公司 | Hydraulic turbine speed power external characteristic simulation device |
| CN105305474B (en) * | 2015-12-01 | 2018-07-31 | 河北凯翔电气科技股份有限公司 | A kind of network load Fast-Balance regulating system and its control method |
| CN105449683B (en) * | 2015-12-17 | 2017-10-31 | 华自科技股份有限公司 | Self-contained unit isolated power grid intelligent power distribution dispatching method and system |
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|---|---|---|---|---|
| CN201444586U (en) * | 2008-12-29 | 2010-04-28 | 哈尔滨理工大学 | Computer quasi-synchronizing device |
| CN201369703Y (en) * | 2009-01-12 | 2009-12-23 | 杭州思绿能源科技有限公司 | Electronic load regulator of small water-turbine generator set |
| CN101645607B (en) * | 2009-09-14 | 2011-11-16 | 华北电力大学（保定） | Quick ideal condition quasi-synchronization paralleling method of hydro-generator |
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Inventor after: Xu Jincai Inventor after: Dong Dafu Inventor after: Xu Wei Inventor after: Jin Huapin Inventor after: Shu Jing Inventor after: Xu Guojun Inventor after: Zhang Wei Inventor after: Hu Changshuo Inventor before: Xu Jincai Inventor before: Dong Dafu Inventor before: Xu Wei Inventor before: Jin Huapin Inventor before: Xu Jing Inventor before: Xu Guojun Inventor before: Zhang Wei Inventor before: Hu Changshuo |
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