CN102769297A - Sub-synchronous oscillation suppression method based on fully-controlled inverter - Google Patents
Sub-synchronous oscillation suppression method based on fully-controlled inverter Download PDFInfo
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Abstract
The invention discloses a sub-synchronous oscillation suppression method based on a fully-controlled inverter in the field of stabilization and control of power systems. The method comprises the following steps of: respectively extracting sub-synchronous frequency components from a generator rotating speed deviation signal, from line current d-axis components and from line current q-axis components; acquiring the voltage deviation value of a direct current capacitor of the fully-controlled inverter; and inputting the sub-synchronous frequency components into the fully-controlled inverter, generating corresponding voltage components, and generating current components which are used for suppressing sub-synchronous oscillation and stabilizing the direct current voltage of the fully-controlled inverter. The method is high in response speed, and the sub-synchronous oscillation caused by various reasons can be effectively suppressed.
Description
Technical field
The invention belongs to power system stability and control field, relate in particular to a kind of sub-synchronous oscillation suppression method based on the full-control type inverter.
Background technology
Along with the continuous development of China's electric power system, big capacity, remote, trans-regional transmission of electricity have become the inexorable trend of power system development.Fixed series capacitor compensation and high voltage direct current transmission (HVDC) are the economical and effective measures that improves electric power system conveying capacity and stability.Yet; Fixed series capacitor compensation can cause the subsynchronous resonance of generating set, HVDC again can with apart from its nearer generating set generation mutual excitation mutually, produce sub-synchronous oscillation; These two kinds of phenomenons all might cause the axle system of generating set tired, even possibly cause the fracture of axle system.Aspect the sub-synchronous oscillation inhibition, Chinese scholars has proposed some inhibition methods in succession, and major part has dropped into on-the-spot the use, like block filter, additional excitation damping control, SVC, the control of direct current additional damping etc.But the subsynchronous resonance that these methods are caused by fixed series compensation in response speed, floor space, inhibition; All there is certain defective in the aspects such as integration capability of the sub-synchronous oscillation that is caused by HVDC, PSS and FACTS device, a kind of inhibition method that remedies above-mentioned shortcoming of still needing.
Summary of the invention
It is not enough to exist response speed to wait slowly to the existing sub-synchronous oscillation of mentioning in the above-mentioned background technology, the present invention proposes a kind of sub-synchronous oscillation suppression method based on the full-control type inverter.
Technical scheme of the present invention is that a kind of sub-synchronous oscillation suppression method based on the full-control type inverter is characterized in that:
Step 1: gather the speed error signal of generator, therefrom extract the subsynchronous frequency component in the rotating speed deviation;
Step 2: gather the electric current of the circuit at full-control type inverter access point place, extract subsynchronous frequency component and the subsynchronous frequency component in the line current q axle component in the line current d axle component wherein;
Step 3: the voltage deviation amount of gathering the dc capacitor of full-control type inverter;
Step 4: with the q axle input variable of the subsynchronous frequency component in subsynchronous frequency component in the rotating speed deviation and the line current q axle component as the full-control type circuit control device; With the voltage deviation amount of the dc capacitor of full-control type inverter and the subsynchronous frequency component in the line current d axle component d axle input variable as the full-control type circuit control device;
Step 5: the d axle input variable of the q axle input variable of the controller of full-control type inverter and the controller of full-control type inverter produces the correspondent voltage component in the output voltage of full-control type inverter, and then produces the inhibition sub-synchronous oscillation and keep the stable current component of full-control type inverter direct-current voltage.
The speed error signal of said generator is through the modal filter collection.
Said full-control type inverter adopts main topological structure.
Said main topological structure comprises three-phase two level structures, multiple inverter configuration, embedded many level structure, H bridge cascade structure and MMC structure.
Subsynchronous frequency component in the said line current d axle component and the subsynchronous frequency component in the line current q axle component are extracted through subsynchronous current filter.
Response speed of the present invention is fast, and the waveform modulated ability is strong, and output harmonic wave is little; Be under the stable situation near the zero output state, little to the electric power system influence; The parallel connection connecting system is flexible, can effectively suppress the sub-synchronous oscillation that a variety of causes causes; Compare with SVC, not influenced by the access point system voltage, floor space is little.
Description of drawings
Fig. 1 is a subsynchronous oscillation damping blocking-up inhibition method sketch map;
Fig. 2 is subsynchronous current filter principle schematic;
Fig. 3 is the modal filter principle schematic;
The torque simulation curve figure of generator when Fig. 4 is the IEEE first master pattern generation three-phase earth fault;
When Fig. 5 is the generator end generation three-phase earth fault that adopts in IEEE first master pattern of method of the present invention, the torque simulation curve figure of generator.
Embodiment
Below in conjunction with accompanying drawing, blocking-up combines the inhibition method to be elaborated to subsynchronous oscillation damping.Should be emphasized that following explanation only is exemplary, rather than in order to limit scope of the present invention and application thereof.
The present invention provides a kind of damping blocking-up associated methods of the inhibition sub-synchronous oscillation based on the full-control type inverter; In order to carry out the inhibition of sub-synchronous oscillation in the electric power system: the full-control type inverter is through connecting transformer or small inductor parallel connection connecting system; Adopt the Direct Current Control of dq decoupling zero; Through subsynchronous current filter; Under the dq coordinate system, extract the subsynchronous component in the full-control type inverter access point system side electric current, it respectively as the outer shroud input of controller d axle and q axle, is blocked the magnitude of current of the subsynchronous electric current of circuit in order to generation; Through modal filter, extract the subsynchronous frequency component in the generator speed deviation, with its outer shroud input, in order to produce the magnitude of current of damping generator unit shaft system torsional oscillation as controller q axle; Capacitance voltage (H bridge cascade full-control type inverter the rounds the body dc voltage average value) departure of full-control type inverter direct-flow side is imported as the outer shroud of controller d axle, in order to produce the magnitude of current of stable DC lateral capacitance voltage.
The present invention is by the full-control type inverter; Through the Direct Current Control of dq decoupling zero, modulate the magnitude of current that suppresses sub-synchronous oscillation, wherein; The subsynchronous magnitude of current opposite sign but equal magnitude of one part of current and full-control type inverter access point system side; According to kirchhoff electric current theorem, the subsynchronous electric current of full-control type inverter access point generating pusher side is approaching zero, thereby reaches the purpose of the subsynchronous electric current inflow generator of blocking-up.But in the disturbance starting stage, because the control of full-control type inverter needs certain response time and tracing process, the axle system of generator still receives the disturbance of subsynchronous electric current, produces torsional oscillation.Therefore, also need the full-control type inverter to produce the subsynchronous current component of another part, this component flows into generator unit stator and produces the damping torque that suppresses the generator sub-synchronous oscillation, thereby reduces the amplitude of shafting torsional oscillation, the rate of decay of quickening shafting torsional oscillation.
The step of the inventive method is:
Step 1: gather the speed error signal of generator,, extract the subsynchronous frequency component in the rotating speed deviation through modal filter;
Step 2: gather the electric current of the circuit at full-control type inverter access point place,, extract subsynchronous frequency component and the subsynchronous frequency component in the line current q axle component in the line current d axle component wherein through subsynchronous current filter;
Step 3: the voltage deviation amount of gathering the dc capacitor of full-control type inverter;
Step 4: with the q axle input variable of the subsynchronous frequency component in subsynchronous frequency component in the rotating speed deviation and the line current q axle component as the full-control type circuit control device; With the voltage deviation amount of the dc capacitor of full-control type inverter and the subsynchronous frequency component in the line current d axle component d axle input variable as the full-control type circuit control device;
Step 5: the d axle input variable of the q axle input variable of the controller of full-control type inverter and full-control type circuit control device produces the correspondent voltage component in the output voltage of full-control type inverter, and then produces the inhibition sub-synchronous oscillation and keep the stable current component of full-control type inverter direct-current voltage.
In the said method step, the main topological structure that the full-control type inverter adopts; Main topological structure comprises three-phase two level structures, multiple inverter configuration, embedded many level structure, H bridge cascade structure and MMC structure; The full-control type inverter is through connecting transformer or small inductor parallel connection connecting system, and the point that can insert comprises: the circuit in generator machine end, generator outlet transformer high-voltage side, the system.Through with the anti-injected system of subsynchronous electric current in the circuit, block subsynchronous electric current inflow generator rapidly; Modal components through introducing in the generator speed deviation produces corresponding subsynchronous electric current injected system, the torsional oscillation of rapid damping generator shaft system.
The full-control type inverter that Fig. 1 is based on SPWM control is used to suppress the damping of sub-synchronous oscillation and the control block diagram of blocking-up combined techniques.In the speed error signal of generator, through modal filter, extract the modal components of generator torsional vibration frequency, with it as one of q axle input variable of controller; In the system side electric current of full-control type inverter access point, through subsynchronous current filter, extract the dq axle component of subsynchronous electric current in the circuit, respectively with it as one of dq axle input variable of controller; With the dc capacitor voltage departure of full-control type inverter as one of d axle input variable of controller.
The subsynchronous component △ ω of rotating speed deviation
ModeThe subsynchronous frequency quantity i of q axle with line current
Lq_mode, PI forms the q axle reference current i of controller outer shroud input after regulating
Q_order, with the q axle component i of full-control type inverter output current
qAct on interior ring after subtracting each other, finally form the q shaft voltage component u of modulating wave
IqThe subsynchronous frequency quantity i of d axle of line current
Ld_modeDeparture △ U with direct voltage
Dc, PI forms the d axle reference current i of controller outer shroud input after regulating
D_order, with the d axle component i of full-control type inverter output current
dAct on interior ring after subtracting each other, finally form the d shaft voltage component u of modulating wave
IdThe dq shaft voltage component of modulating wave forms the three-phase voltage amount of modulating wave after the dq/abc conversion, with carrier wave ratio after, form the pulse triggering signal of control full-controlled switch device break-make.According to the control principle of SPWM, will contain in the voltage of full-control type inverter output and modulating wave same frequency, same-phase, amplitude controlled subsynchronous frequency component.This component and the acting in conjunction of access point system voltage produce the subsynchronous electric current of corresponding frequencies in leakage reactance that is connected transformer or small inductor.When the PI of controller parameter is provided with when reasonable; Through regulating the subsynchronous component of full-control type inverter output voltage; Produce the current component of stable DC capacitance voltage on the one hand, produce the subsynchronous current component of damping generator unit shaft system torsional oscillation and the negative-phase sequence curent component of the subsynchronous electric current of blocking system on the other hand.
Shown in the following formula of transformation relation of voltage between abc coordinate system and dq coordinate system:
Wherein:
u
a, u
b, u
cA phase voltage, b phase voltage and c phase voltage for the correspondence under the abc coordinate system;
u
d, u
qBe d axle component under the dq coordinate system and q axle component;
δ is the initial phase of a phase voltage;
ω
0Be power frequency angular speed;
T is the time.
Fig. 2 is the subsynchronous current filter principle schematic of extraction system line current subsynchronous component; The dq axle component that the circuit three-phase current is converted to; Through with each torsional vibration frequency of generator being band pass filter extraction each d axle component and the q axle component identical of centre frequency with the generator torsional vibration frequency; Amplify through phase shift, the stack back forms total subsynchronous electric current of dq axle.
Fig. 3 is for extracting the modal filter principle schematic of generator speed torsion frequency component; Rotating speed deviation with generator is input; Process is the band pass filter of centre frequency with each torsional vibration frequency of generator; Extract the mode rotating speed component of each torsional vibration frequency, amplify through phase shift, the stack back forms total mode rotating speed component.
Fig. 4 does not take under any braking measure situation, the torque simulation curve figure of generator during the IEEE first master pattern generation three-phase earth fault, and torque oscillation is tending towards dispersing, and sub-synchronous oscillation is unstable.
When Fig. 5 is the generator end generation three-phase earth fault that adopts in IEEE first master pattern of the inventive method, the torque simulation curve figure of generator.As can be seen from the figure, torque oscillation is restrained rapidly, and sub-synchronous oscillation is stable.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (5)
1. sub-synchronous oscillation suppression method based on the full-control type inverter is characterized in that:
Step 1: gather the speed error signal of generator, therefrom extract the subsynchronous frequency component in the rotating speed deviation;
Step 2: gather the electric current of the circuit at full-control type inverter access point place, extract subsynchronous frequency component and the subsynchronous frequency component in the line current q axle component in the line current d axle component wherein;
Step 3: the voltage deviation amount of gathering the dc capacitor of full-control type inverter;
Step 4: with the q axle input variable of the subsynchronous frequency component in subsynchronous frequency component in the rotating speed deviation and the line current q axle component as the full-control type circuit control device; With the voltage deviation amount of the dc capacitor of full-control type inverter and the subsynchronous frequency component in the line current d axle component d axle input variable as the full-control type circuit control device;
Step 5: the d axle input variable of the q axle input variable of the controller of full-control type inverter and the controller of full-control type inverter produces the correspondent voltage component in the output voltage of full-control type inverter, and then produces the inhibition sub-synchronous oscillation and keep the stable current component of full-control type inverter direct-current voltage.
2. a kind of sub-synchronous oscillation suppression method based on the full-control type inverter according to claim 1, the speed error signal that it is characterized in that said generator is through the modal filter collection.
3. a kind of sub-synchronous oscillation suppression method based on the full-control type inverter according to claim 1 is characterized in that said full-control type inverter adopts main topological structure.
4. a kind of sub-synchronous oscillation suppression method based on the full-control type inverter according to claim 3 is characterized in that said main topological structure comprises three-phase two level structures, multiple inverter configuration, embedded many level structure, H bridge cascade structure and MMC structure.
5. a kind of sub-synchronous oscillation suppression method based on the full-control type inverter according to claim 1 is characterized in that subsynchronous frequency component and the subsynchronous frequency component in the line current q axle component in the said line current d axle component extracted through subsynchronous current filter.
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| CN104009495A (en) * | 2014-05-14 | 2014-08-27 | 上海交通大学 | Wind power plant flexible direct current grid connection subsynchronous oscillating current detection and suppression method |
| CN104333022A (en) * | 2014-11-17 | 2015-02-04 | 荣信电力电子股份有限公司 | Method for restraining subsynchronous oscillation caused by grid connection of draught fan based on SVG |
| CN104934992A (en) * | 2015-06-23 | 2015-09-23 | 国家电网公司 | Subsynchronous oscillation suppression device and method based on phase-locked loop error |
| CN105071409A (en) * | 2015-08-28 | 2015-11-18 | 中国神华能源股份有限公司 | Subharmonic reactive power generator |
| CN105136285A (en) * | 2015-08-28 | 2015-12-09 | 中国神华能源股份有限公司 | Generator shafting torsional oscillation component extraction device and method |
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| CN104934992A (en) * | 2015-06-23 | 2015-09-23 | 国家电网公司 | Subsynchronous oscillation suppression device and method based on phase-locked loop error |
| CN105136285A (en) * | 2015-08-28 | 2015-12-09 | 中国神华能源股份有限公司 | Generator shafting torsional oscillation component extraction device and method |
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| CN106099955A (en) * | 2016-07-28 | 2016-11-09 | 华北电力大学 | A kind of HVDC that blocks controls the method for subsynchronous frequency component in loop |
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| CN106972511A (en) * | 2017-04-25 | 2017-07-21 | 国网宁夏电力公司电力科学研究院 | The directly driven wind-powered sub-synchronous oscillation suppression method optimized based on net side control loop |
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