CN102769297B - Sub-synchronous oscillation suppression method based on fully-controlled inverter - Google Patents
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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 full-control type inverter.
Background technology
Along with the development of China's electric power system, large 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.But, fixed series capacitor compensation can cause the subsynchronous resonance of generating set, HVDC again can with apart from its nearer generating set generation phase mutual excitation, produce sub-synchronous oscillation, these two kinds of phenomenons all likely cause the axle system of generating set tired, even may cause the fracture of axle system.Aspect sub-synchronous oscillation inhibition, Chinese scholars has proposed some inhibition methods in succession, and major part has dropped into on-the-spot use, as block filter, supplementary excitation damping control, Static Var Compensator, 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 defect, a kind of inhibition method that makes up above-mentioned shortcoming of still needing in the aspects such as the integration capability of the sub-synchronous oscillation being caused by HVDC, PSS and FACTS device.
Summary of the invention
Exist response speed to wait slowly for the existing sub-synchronous oscillation of mentioning in above-mentioned background technology not enough, the present invention proposes a kind of sub-synchronous oscillation suppression method based on full-control type inverter.
Technical scheme of the present invention is that a kind of sub-synchronous oscillation suppression method based on full-control type inverter, is characterized in that:
Step 1: gather the speed error signal of generator, therefrom extract the subsynchronous frequency component in rotating speed deviation;
Step 2: gather the electric current of the circuit at full-control type inverter access point place, extract the subsynchronous frequency component in subsynchronous frequency component and the line current q axle component in line current d axle component wherein;
Step 3: the voltage deviation amount that gathers the DC capacitor of full-control type inverter;
Step 4: the q axle input variable using the subsynchronous frequency component in the subsynchronous frequency component in rotating speed deviation and line current q axle component as full-control type circuit control device; D axle input variable using the subsynchronous frequency component in the voltage deviation amount of the DC capacitor of full-control type inverter and line current d axle component as 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 corresponding component of voltage in the output voltage of full-control type inverter, and then produce inhibition sub-synchronous oscillation and maintain the stable current component of full-control type inverter direct-current voltage.
The speed error signal of described generator gathers by modal filter.
Described full-control type inverter adopts main topological structure.
Described 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 subsynchronous frequency component and line current q axle component in described line current d axle component is extracted by subsynchronous current filter.
Fast response time of the present invention, waveform modulated ability is strong, and output harmonic wave is little; In approaching zero output state, little to effect on power system under stable situation; Connecting system in parallel is flexible, can effectively suppress the sub-synchronous oscillation that a variety of causes causes; Compared with SVC, not affected by access point system voltage, floor space is little.
Brief description of the drawings
Fig. 1 is subsynchronous oscillation damping blocking-up inhibition method schematic diagram;
Fig. 2 is subsynchronous current filter principle schematic;
Fig. 3 is modal filter principle schematic;
The torque simulation curve figure of generator when Fig. 4 is IEEE the first master pattern generation three-phase ground fault;
When Fig. 5 is the generator end generation three-phase ground fault adopting 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, to subsynchronous oscillation damping, blocking-up is elaborated in conjunction with inhibition method.Should be emphasized that, following explanation is only exemplary, instead of in order to limit the scope of the invention and to apply.
The invention provides a kind of damping blocking-up associated methods of the inhibition sub-synchronous oscillation based on full-control type inverter, in order to carry out the inhibition of sub-synchronous oscillation in electric power system: full-control type inverter is through connection transformer or small inductor connecting system in parallel, adopt the Direct Current Control of dq decoupling zero, through subsynchronous current filter, under dq coordinate system, extract the subsynchronous component in 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 to the magnitude of current of the subsynchronous electric current of circuit in order to generation; Through modal filter, extract the subsynchronous frequency component in generator speed deviation, set it as the outer shroud input of controller q axle, in order to produce the magnitude of current of damping generator unit shaft system torsional oscillation; Outer shroud input using the capacitance voltage of full-control type inverter direct-flow side (H bridge cascade full-control type inverter rounds body DC voltage average value) departure as controller d axle, in order to produce the magnitude of current of stable DC lateral capacitance voltage.
The present invention is by full-control type inverter, by 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 approaches zero, thereby reaches the object 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 is still subject to the disturbance of subsynchronous electric current, produces torsional oscillation.Therefore, also need 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 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, by modal filter, extract the subsynchronous frequency component in rotating speed deviation;
Step 2: gather the electric current of the circuit at full-control type inverter access point place, by subsynchronous current filter, extract the subsynchronous frequency component in subsynchronous frequency component and the line current q axle component in line current d axle component wherein;
Step 3: the voltage deviation amount that gathers the DC capacitor of full-control type inverter;
Step 4: the q axle input variable using the subsynchronous frequency component in the subsynchronous frequency component in rotating speed deviation and line current q axle component as full-control type circuit control device; D axle input variable using the subsynchronous frequency component in the voltage deviation amount of the DC capacitor of full-control type inverter and line current d axle component as 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 corresponding component of voltage in the output voltage of full-control type inverter, and then produce inhibition sub-synchronous oscillation and maintain the stable current component of full-control type inverter direct-current voltage.
In said method step, the main topological structure that 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; Full-control type inverter is by connection transformer or small inductor connecting system in parallel, and accessible point comprises: the circuit in Generator end, generator outlet high voltage side of transformer, system.By by the anti-injected system of subsynchronous electric current in circuit, block rapidly subsynchronous electric current inflow generator; Produce corresponding subsynchronous electric current injected system by the modal components of introducing in generator speed deviation, the torsional oscillation of rapid damping generator shaft system.
Fig. 1 control block diagram with blocking-up combined techniques that is the full-control type inverter controlled based on SPWM for the damping that suppresses sub-synchronous oscillation.In the speed error signal of generator, through modal filter, extract the modal components of generator torsional vibration frequency, set 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 circuit, set it as respectively one of dq axle input variable of controller; One of d axle input variable using the DC capacitor voltage departure of full-control type inverter as controller.
The subsynchronous component △ ω of rotating speed deviation
modethe subsynchronous frequency quantity i of q axle with line current
lq_modethe q axle reference current i of formation control device outer shroud input after PI regulates
q_order, with the q axle component i of full-control type inverter output current
qafter subtracting each other, act on interior ring, finally form the q shaft voltage component u of modulating wave
iq; The subsynchronous frequency quantity i of d axle of line current
ld_modedeparture △ U with direct voltage
dcthe d axle reference current i of formation control device outer shroud input after PI regulates
d_order, with the d axle component i of full-control type inverter output current
dafter subtracting each other, act on interior ring, finally form the d shaft voltage component u of modulating wave
id; The dq shaft voltage component of modulating wave, after dq/abc conversion, forms the three-phase voltage amount of modulating wave, with carrier wave ratio after, the pulse triggering signal of formation control full-controlled switch device break-make.According to the control principle of SPWM, in the voltage of full-control type inverter output, will contain and modulating wave same frequency, same-phase, amplitude controlled subsynchronous frequency component.This component and the acting in conjunction of access point system voltage, in leakage reactance or the small inductor of connection transformer, produce the subsynchronous electric current of corresponding frequencies.When the PI of controller parameter arranges when reasonable, by regulating the subsynchronous component of full-control type inverter output voltage, the current component that produces on the one hand stable DC capacitance voltage, produces 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
cfor corresponding a phase voltage, b phase voltage and c phase voltage under abc coordinate system;
U
d, u
qfor the d axle component under dq coordinate system and q axle component;
δ is the initial phase of a phase voltage;
ω
0for 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 circuit three-phase current is converted to, band pass filter by frequency centered by the each torsional vibration frequency of generator extracts each d axle component and the q axle component identical with generator torsional vibration frequency, amplify through phase shift, after stack, form total subsynchronous electric current of dq axle.
Fig. 3 is the modal filter principle schematic of extracting generator speed torsion frequency component, taking the rotating speed deviation of generator as input, through the band pass filter of frequency centered by the each torsional vibration frequency of generator, extract the mode rotating speed component of each torsional vibration frequency, amplify through phase shift, after stack, form total mode rotating speed component.
Fig. 4 does not take in any braking measure situation, the torque simulation curve figure of generator when IEEE the first master pattern generation three-phase ground fault, and torque oscillation is tending towards dispersing, and sub-synchronous oscillation is unstable.
When Fig. 5 is the generator end generation three-phase ground fault adopting 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; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in 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 (1)
1. the blocking-up of the subsynchronous oscillation damping based on a full-control type inverter inhibition method, is characterized in that, comprising:
Step 1: gather the speed error signal of generator, therefrom extract the subsynchronous frequency component in rotating speed deviation, the sub-synchronous oscillation causing for damping generator shafting torsional oscillation;
Step 2: gather the line current of full-control type inverter access point place system, extract the subsynchronous frequency component in subsynchronous frequency component and the line current q axle component in line current d axle component wherein;
Step 3: the voltage deviation amount that gathers the DC capacitor of full-control type inverter;
Step 4: the q axle input variable using the subsynchronous frequency component in the subsynchronous frequency component in rotating speed deviation and line current q axle component as full-control type circuit control device; D axle input variable using the subsynchronous frequency component in the voltage deviation amount of the DC capacitor of full-control type inverter and line current d axle component as 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 corresponding component of voltage in the output voltage of full-control type inverter, and then produce inhibition sub-synchronous oscillation and maintain the stable current component of full-control type inverter direct-current voltage;
The speed error signal of described generator gathers by modal filter;
Described full-control type inverter adopts main topological structure;
Described 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 subsynchronous frequency component and line current q axle component in described line current d axle component is extracted by subsynchronous current filter;
Described method is in order to carry out the inhibition of sub-synchronous oscillation in electric power system; Full-control type inverter is through connection transformer or small inductor connecting system in parallel, adopt the Direct Current Control of dq decoupling zero, through subsynchronous current filter, under dq coordinate system, extract the subsynchronous component in 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 to the magnitude of current of the subsynchronous electric current of circuit in order to generation; Through modal filter, extract the subsynchronous frequency component in generator speed deviation, set it as the outer shroud input of controller q axle, in order to produce the magnitude of current of damping generator unit shaft system torsional oscillation; The capacitance voltage of full-control type inverter direct-flow side or H bridge cascade full-control type inverter are rounded to the departure of body DC voltage average value as the outer shroud input of controller d axle, in order to produce the magnitude of current of stable DC lateral capacitance voltage;
Described method, by by the anti-injected system of subsynchronous electric current in circuit, is blocked rapidly subsynchronous electric current inflow generator; Produce corresponding subsynchronous electric current injected system by the modal components of introducing in generator speed deviation, the torsional oscillation of rapid damping generator shaft system;
The subsynchronous component Δ ω of described method medium speed deviation
modethe subsynchronous frequency quantity i of q axle with line current
lq_modethe q axle reference current i of formation control device outer shroud input after PI regulates
q_order, with the q axle component i of full-control type inverter output current
qafter subtracting each other, act on interior ring, finally form the q shaft voltage component u of modulating wave
iq; The subsynchronous frequency quantity i of d axle of line current
ld_modedeparture Δ U with direct voltage
dcthe d axle reference current i of formation control device outer shroud input after PI regulates
d_order, with the d axle component i of full-control type inverter output current
dafter subtracting each other, act on interior ring, finally form the d shaft voltage component u of modulating wave
id; The dq shaft voltage component of modulating wave, after dq/abc conversion, forms the three-phase voltage amount of modulating wave, with carrier wave ratio after, the pulse triggering signal of formation control full-controlled switch device break-make; According to the control principle of SPWM, in the voltage of full-control type inverter output, will contain and modulating wave same frequency, same-phase, amplitude controlled subsynchronous frequency component, this component and the acting in conjunction of access point system voltage, in leakage reactance or the small inductor of connection transformer, produce the subsynchronous electric current of corresponding frequencies; When the PI of controller parameter arranges when reasonable, by regulating the subsynchronous component of full-control type inverter output voltage, the current component that produces on the one hand stable DC capacitance voltage, produces 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.
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| CN101615791B (en) * | 2009-07-29 | 2011-08-17 | 清华大学 | Subsynchronous damping control system for effectively inhibiting subsynchronous resonance and oscillation |
| JP2011125107A (en) * | 2009-12-09 | 2011-06-23 | Sanyo Electric Co Ltd | Motor control device, motor drive system, and inverter control device |
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| CN105071416A (en) * | 2015-08-28 | 2015-11-18 | 中国神华能源股份有限公司 | Subsynchronous oscillation inhibition apparatus and method for inhibiting flickering of power network |
| CN105071416B (en) * | 2015-08-28 | 2018-05-04 | 中国神华能源股份有限公司 | A kind of sub-synchronous oscillation restraining device and method for suppressing power grid flickering |
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