CN203883471U - Power system stabilizer on turbine side - Google Patents
Power system stabilizer on turbine side Download PDFInfo
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- CN203883471U CN203883471U CN201420310621.5U CN201420310621U CN203883471U CN 203883471 U CN203883471 U CN 203883471U CN 201420310621 U CN201420310621 U CN 201420310621U CN 203883471 U CN203883471 U CN 203883471U
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- 239000003381 stabilizer Substances 0.000 title claims abstract description 33
- 238000013016 damping Methods 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 230000010355 oscillation Effects 0.000 description 19
- 230000005284 excitation Effects 0.000 description 7
- 230000005764 inhibitory process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
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Abstract
The utility model provides a power system stabilizer on a turbine side. The power system stabilizer includes a signal converter, a restorer, a controller and a voltage converter. The power system stabilizer is characterized in that the signal converter is connected to a power difference signal collector; the restorer is connected to the signal converter; a PID regulator is connected to the restorer; the controller is connected to the PID regulator; the voltage converter is connected to the controller; an adder is connected to the voltage converter; the adder is also connected to the power difference signal collector and the rotational speed difference signal collector; and a turbine speed-regulating system is connected to the adder. According to the utility model, the PID regulator is added to the stabilizer on the basis of a conventional power system stabilizer. A dead zone is designed for the power system stabilizer through the PID regulator so that the PID regulator works just when a large disturbance appears in the power of a power grid side. Meanwhile, an output signal, an active power difference signal and a rotational speed difference signal are all used as an input signal of the turbine speed-regulating system for an adjustment so that a power system is more stable in operation.
Description
Technical field
The utility model belongs to power system stability control technology field, is a kind of power system stabilizer, PSS that is positioned at steamer pusher side that wattful power rate variance Δ Pe signal is input signal of take.
Background technology
Because power system stabilizer, PSS has clear physics conception, do not need to increase system primary equipment, field adjustable is convenient, be easy to the advantages such as realizations, it is to use in the world at present the most extensive, the most economical and comparatively measure of the inhibition low-frequency oscillation of maturation of technology.Wherein generate electricity pusher side power system stabilizer, PSS as a kind of additional excitation control, its operation principle is to adopt signal that generator shaft speed deviation delta w, system frequency deviation Δ f or generator accelerating power deviation delta Pa etc. are relevant to vibration as input, through suitably the control signal of generation being added on field regulator by excitation reference voltage input terminal after amplification and phase compensation, by excitation system, provide additional damping torque for system, thereby suppress low-frequency oscillation.But along with the increase of unit parameter, the contact more sophisticated between electrical network, it has engendered some shortcomings part:
1) shortcoming of conventional electric generators side power system stabilizer, PSS self: generating pusher side power system stabilizer, PSS depends primarily on the coordination between each power system stabilizer, PSS of reasonable setting, addressing and multimachine system of parameter to the inhibition of low-frequency oscillation.Although generating pusher side power system stabilizer, PSS has played good effect for suppressing low-frequency oscillation.But due to excitation system and electric power system and operational mode thereof and operating mode closely related, make in electric power system the coordinate design of PSS and the selection of infield quite complicated, cannot be extended to multimachine system, and robustness is not ideal enough.
2) because governing system in the past exists " dead band " and inertia, dynamic response is slower than excitation system, therefore suppress in research in low frequency oscillations, adopts that excitation system is additional more and control the method for (generating pusher side auxiliary power system stability device).But along with develop rapidly and the application of steamer pusher side digital electric-hydraulic speed regulator, the response speed of modern turbine regulating system is also not less than excitation system, aspect inhibition low-frequency oscillation, to prime mover side governing system, take control measure often more effective.
3) along with research is in recent years found, generator speed regulating control side also likely causes low-frequency oscillation.Merit frequently in speed regulating control due to the measurement difficulty of rotor mechanical power, generally all adopt generator active power, when there is meritorious power disturbance, make the control mode of power stage controlling unit be changed to electrical power feed-forward mode by mechanical output feedback system, damping is reduced.When active power disturbance approaches resonance frequency, can cause mechanical output resonance.So install more meaningful that novel prime mover side power system stabilizer, PSS shows inhibition low-frequency oscillation additional.
Utility model content
The utility model provides a kind of power system stabilizer, PSS of steamer pusher side according to the deficiencies in the prior art, making up the robustness, the multimachine decoupling that exist in existing steamer pusher side power system stabilizer, PSS, transient stability is bad and the weak point that cannot suppress mandatory low-frequency oscillation.
The technical solution of the utility model: a kind of steamer pusher side power system stabilizer, PSS, comprise signal converter, restorer, controller and voltage changer, it is characterized in that: described signal converter is connected on power difference signal collector, restorer connects signal converter, PID adjuster connects restorer, controller connects PID adjuster, voltage changer connects controller, adder connects voltage changer, adder also connects power difference signal collector and speed discrepancy signal picker, and turbine regulating system connects adder.
Described controller comprises damping converter and phase compensator, and damping converter and phase compensator are connected between PID adjuster and voltage changer successively.
Described signal converter can adopt three-phase Hall power inverter.
Technique effect of the present utility model: the utility model stabilizer has added PID controller on the basis of conventional electric power system stability device, utilize it to dead band of Design of Power System Stabilizer, make it only when significantly disturbance appears in grid side power, to work, simultaneously by the output signal of stabilizer and active power signal difference, tach signal is poor to be adjusted as the input signal of turbine regulating system jointly, the utility model stabilizer not only works to traditional negative damping type low-frequency oscillation, simultaneously also can be to steamer pusher side because good inhibitory action is played in the obsessional type low-frequency oscillation that external disturbance causes, effectively controlled the balance between steamer pusher side and grid side, and well met the requirement of present electric power system to phase compensation, make power system operation more stable.
Accompanying drawing explanation
Fig. 1 is the utility model overall structure schematic diagram;
Fig. 2 is controller architecture schematic diagram of the present utility model.
Number in the figure represents respectively: 1-power difference signal collector, 2-signal converter, 3-restorer, 4-PID adjuster, 5-controller, 6-voltage changer, 7-adder, 8-turbine regulating system, 9-speed discrepancy signal picker, 10-damping converter, 11-phase compensator.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further illustrated:
As illustrated in fig. 1 and 2, a kind of steamer pusher side power system stabilizer, PSS, comprise signal converter 2, restorer 3, controller 5 and voltage changer 6, it is characterized in that: described signal converter 2 is connected on power difference signal collector 1, restorer 3 connects signal converter 2, PID adjuster 4 connects restorer 3, controller 5 connects PID adjuster 4, voltage changer 6 connects controller 5, adder 7 connects voltage changer 6, adder 7 also connects power difference signal collector 1 and speed discrepancy signal picker 9, and turbine regulating system 8 connects adder 7.
Described controller 5 comprises damping converter 10 and phase compensator 11, and damping converter 10 and phase compensator 11 are connected between P ID adjuster 4 and voltage changer 6 successively.
The structure performing step of the power system stabilizer, PSS of turbine regulating system side is as follows: 1) generator active power is fed back, superpose with given power, determine that the meritorious poor Δ Pe of power signal is as the input signal of novel electric power system stability device; 2) with restorer, DC quantity constant in circuit is isolated; 3) utilize the small magnitude fluctuation that PID controller allows electrical network to isolate; 4) adopt phase compensator to compensate filtered low-frequency high-amplitude oscillator signal; 5) be added to poor with power signal in the adder of turbine regulating system side, tach signal of output signal is poor jointly as the input signal of governing system the most at last for the aperture signal that by voltage changer, voltage signal is converted to adjuster valve, thereby realizes the stable of electric power system.
Before the signal converter of power system stabilizer, PSS of the present utility model is positioned at restorer, the active power signal difference Δ Pe that the system of directly accepting transmits, change the power oscillation signal of input into voltage oscillation signal and output to restorer, for reducing time constant and the ripple of transmitter, can adopt three-phase Hall power inverter.
Restorer is between signal converter and PID controller, be used for making input signal to change while reaching stable state, PSS is output not, namely PSS is not because the steady-state value difference of input signal has constant output, as input a step signal, after transient process finishes, PSS answers no-output, from circuit, says it is that DC quantity constant is kept apart.
PID controller is mainly to regulate for arranging the small magnitude low-frequency oscillation allowing in the isolation electric power system of dead band, reduce the action frequency of actuator, it is only worked when the disturbance of electrical power generation amplitude, and concrete dead band need to be set according to the actual conditions of electrical network.Because active power fluctuates in less scope, can not cause very large impact to the stable of electric power system, so in fact there is no need the active power of generator output to control very accurately.When input signal is less than the skip distance of setting, the output valve in dead band is 0, when the absolute value of error is greater than the skip distance of setting, the input in dead band, is output as linear relationship, by normal PID rule, controls.Dead band is output as at 0 o'clock, and the proportional parts of PID controller and differential are partly 0, and integral part remains unchanged.Making skip distance is 0 o'clock, and dead band is just in closed condition.
The controller of this novel electric power system stability device is comprised of damping converter and phase compensator, damping converter is for the treatment of described damped oscillation signal, for system provides pure enough positive dampings, phase compensator adopts phase compensation function to carry out phase compensation to detecting isolation oscillator signal, obtain the outputting oscillation signal after phase compensation, adopt multistage lead-lag unit can make frequency characteristic in wider frequency range, obtain suitable compensation.
Although the part-structure of this novel electric power system stability device is identical with traditional generating pusher side power system stabilizer, PSS, but the utility model power system stabilizer, PSS is by the oscillator signal of input, the outputting oscillation signal after signal converter conversion, restorer and the isolation of PID controller and the phase compensation of phase compensator is finally added on turbine regulating system, has the difference of essence on installation site with traditional generating pusher side power system stabilizer, PSS.By relevant simulating, verifying, this novel electric power system stability device not only can suppress the low-frequency oscillation of negative damping type, can also suppress the low-frequency oscillation of obsessional type.Compare with traditional generating pusher side power system stabilizer, PSS simultaneously also there is good robustness, multimachine decoupling.
Claims (3)
1. a steamer pusher side power system stabilizer, PSS, comprise signal converter (2), restorer (3), controller (5) and voltage changer (6), it is characterized in that: described signal converter (2) is connected on power difference signal collector (1), restorer (3) connects signal converter (2), PID adjuster (4) connects restorer (3), controller (5) connects PID adjuster (4), voltage changer (6) connects controller (5), adder (7) connects voltage changer (6), adder (7) also connects power difference signal collector (1) and speed discrepancy signal picker (9), turbine regulating system (8) connects adder (7).
2. steamer pusher side power system stabilizer, PSS according to claim 1, it is characterized in that: described controller (5) comprises damping converter (10) and phase compensator (11), damping converter (10) and phase compensator (11) are connected between PID adjuster (4) and voltage changer (6) successively.
3. steamer pusher side power system stabilizer, PSS according to claim 1, is characterized in that: described signal converter (2) can adopt three-phase Hall power inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420310621.5U CN203883471U (en) | 2014-06-11 | 2014-06-11 | Power system stabilizer on turbine side |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420310621.5U CN203883471U (en) | 2014-06-11 | 2014-06-11 | Power system stabilizer on turbine side |
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| Publication Number | Publication Date |
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| CN203883471U true CN203883471U (en) | 2014-10-15 |
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| CN201420310621.5U Expired - Fee Related CN203883471U (en) | 2014-06-11 | 2014-06-11 | Power system stabilizer on turbine side |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111694348A (en) * | 2020-07-29 | 2020-09-22 | 国网河南省电力公司电力科学研究院 | Method and device for testing power feedback performance of thermal power generating unit speed regulating system |
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2014
- 2014-06-11 CN CN201420310621.5U patent/CN203883471U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111694348A (en) * | 2020-07-29 | 2020-09-22 | 国网河南省电力公司电力科学研究院 | Method and device for testing power feedback performance of thermal power generating unit speed regulating system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141015 |