CN101692579B - Full-controlled variable current device based sub-synchronous oscillation suppression method for generating set - Google Patents
Full-controlled variable current device based sub-synchronous oscillation suppression method for generating set Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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Abstract
The invention relates to a generating set sub-synchronous oscillation suppression method adopting a full-controlled variable current device. The method uses the variable quantity of a rotating speed signal of a generating set as a control quantity, and performs filter, phase shift, proportional amplification and operation processing on the variable quantity of the rotating speed signal to acquire a control signal for controlling a variable current power unit by using a voltage synchronization signal as standard, then the full-controlled variable current device generates a sub-synchronous model modulation current, and the current affects the rotating speed of the generating set through a power transmission unit so as to achieve the aim of suppressing the sub-synchronous oscillation of the generating set. A controller comprises a plurality of signal processing subunits and a main control subunit, wherein each signal processing subunit comprises a filter module, a phase shift module, a proportional amplification module and an operation module; and the main control subunit accomplishes the control for the full-controlled device. The method can effectively suppress the sub-synchronous oscillation problem of a power grid system, has high response speed and high tracing precision, and can greatly improve the stability and reliability of a power grid.
Description
Technical field
The present invention relates to the method that a kind of generating set suppresses sub-synchronous oscillation, particularly a kind of subsynchronous oscillation of generator set inhibition method that adopts the full-control type current device.
Background technology
Along with power system development, putting into operation of superhigh pressure, long-distance transmission line and heavy-duty generator group, and measures such as circuit series capacitor compensation of taking in order to improve stability of power system and ability to transmit electricity and direct current transportation, except incident great economic benefit, brought new problem also for the safe and stable operation of electric power system, subsynchronous oscillation of electrical power system is exactly one of its problem.Series capacitor compensation may cause the subsynchronous resonance of electric power system, and then causes the axle system of turbo generator set to damage.Sub-synchronous oscillation can cause by distorting stress axle system is damaged.Due to the damage of axle system can be accumulated by long low amplitude value torsional oscillation, also can be by due to the high amplitude torsional oscillation of short time.
At present, existing multiple at the subsynchronous resonance problem-solving approach, as thyristor controlled series capacitor (TCSC), NGH damper, additional excitation damping control (SEDC), static reactive (SVC) and block filter (BF) etc.But these solutions are also immature, also rest on theoretical research stage basically, and are also few in the application of real system.
Static reactive (SVC) is as a mature technology, suppress to have aspect the sub-synchronous oscillation simple in structure, advantage such as control is convenient, and is with low cost.It is one of measure of the alleviation sub-synchronous oscillation recommended of IEEE subsynchronous resonance working group.But still come with some shortcomings:
1) SVC equipment is half control type current device, need install additional FC cooperate with it just have from the capacitive to the perception adjustable continuously.Shortcomings such as simultaneously, FC needs the each harmonic component of filtering SVC self generation, and has installed capacity big, and the occupation of land space is big.
2) generally speaking, after SVC installed FC additional, generally 0～+ 100%, compensation range was little for the compensation range of SVC.
3) SVC is a kind of passive solution, and its output offset current is directly proportional with line voltage.When electrical network generation sub-synchronous oscillation, grid voltage change is bigger, and the ability of SVC inhibition sub-synchronous oscillation weakens greatly when the voltage trough.
At present, adopt static reacance generator SVG (Static Var Generator) the technology inhibition sub-synchronous oscillation of full-control type current device also to belong to blank at home and abroad, therefore, suppress the SVG solution of sub-synchronous oscillation problems at many generating sets exploitation of big power station, have very strong exploitativeness and operability.
Summary of the invention
The purpose of this invention is to provide a kind of subsynchronous oscillation of generator set inhibition method based on the full-control type current device, this method adopts the SVG structure, adopt the full-control type current device, the sub-synchronous oscillation problem that can effectively suppress network system, and response speed is fast, the tracking accuracy height can improve the stability and the reliability of electrical network greatly.
For achieving the above object, the present invention is achieved through the following technical solutions:
Subsynchronous oscillation of generator set inhibition method based on the full-control type current device, this method is a controlled quentity controlled variable with the variable quantity of the tach signal of generating set, this tach signal variable quantity via controller is carried out filtering, phase shift, ratio amplification, calculation process, obtain with the voltage synchronizing signal is the control signal of benchmark control unsteady flow power cell, make the full-control type convertor assembly produce subsynchronous mode modulated current, this electric current reaches the purpose that suppresses subsynchronous oscillation of generator set through the rotating speed of power delivery cell influence generating set.
Described full-control type convertor assembly is voltage-dropping type two level power unit parallel connection type SVG structures or voltage-dropping type three level power unit parallel connection type SVG structures.
Described full-control type convertor assembly is voltage-dropping type Δ type chain type SVG structure or voltage-dropping type Y type chain type SVG structure.
Described full-control type convertor assembly is voltage-dropping type MMC type SVG structure or multipleization of voltage-dropping type SVG structure.
Described full-control type convertor assembly is non-voltage-dropping type device tandem type two level SVG structures or non-voltage-dropping type device tandem type three level SVG structures.
Described full-control type convertor assembly is direct hanging type Δ type chain type SVG structure, direct hanging type Y type chain type SVG structure or direct hanging type MMC type SVG structure.
Described controller comprises a plurality of signal processing subelements and master control subelement, and each signal processing subelement comprises filtration module, phase shift block, ratio amplification module, computing module, and the master control subelement is finished the control to the full-control type device;
Described filtration module comprises low pass, high pass filter and the band pass filter that each subsynchronous mode signal is carried out filtering respectively, be used for the variable quantity of tach signal is filtered low frequency, high frequency through low pass, high pass filter, handle through band pass filter again, obtain subsynchronous modal components;
The subsynchronous mode signal that described phase shift block is used for accepting filter unit output carries out phase place with subsynchronous mode signal and corrects;
Described ratio module is used for the subsynchronous mode signal that phase shift is handled is carried out the ratio processing and amplifying;
Described computing module is used for that the subsynchronous mode signal after phase shift, the ratio processing is weighted summation and handles the Comprehensive Control amount that obtains; This controlled quentity controlled variable is become the control signal of full-control type convertor assembly by functional operation.
Described full-control type semiconductor switch device that convertor assembly adopts can be IGBT, GTO, IGCT, IEGT or other full-controlled switch device.
The subsynchronous oscillation of generator set restraining device that this method adopted can be one or more, carries out Redundancy Design.
The subsynchronous oscillation of generator set restraining device that this method adopted can suppress the sub-synchronous oscillation of one or more generating set.
Compared with prior art, the invention has the beneficial effects as follows:
1) response speed is fast
Distinguishing feature based on full-control type device convertor assembly is exactly that response speed is fast.Its main cause is to control arbitrarily the on off state of full-control type device (GTO, IGBT, IGCT, IEGT etc.) as required.And the switching frequency of device or equivalent switching frequency are often higher, and generally the switch number of times of each power frequency period can be from several times to tens times.Therefore, based on the system response time of full-control type device convertor assembly fast several times than SVC.
2) tracking accuracy height
The modes such as pulse-width modulation or heap ripple that can adopt based on full-control type device convertor assembly are controlled, and add that its switching frequency is higher, just can export system in each switch periods and regulate.In addition, system can also adopt the algorithm and the control method of more complicated, makes the tracking accuracy of system improve greatly.That is to say, can carry out the comprehensive regulation simultaneously to the power quality problem of a plurality of frequency bands such as the low-frequency oscillation of system, sub-synchronous oscillation based on full-control type device convertor assembly.
3) need not to install additional FC
SVC type equipment is half control type current device, need install additional FC cooperate with it just have from the capacitive to the perception adjustable continuously.Shortcomings such as simultaneously, FC needs the each harmonic component of filtering SVC self generation, and has installed capacity big, and the occupation of land space is big.
And only produce high-frequency harmonic based on full-control type device convertor assembly, and do not produce the low-order harmonic that has a strong impact on the quality of power supply, so need not to install additional filter, installed capacity is little, floor space is little
4) compensation range is wide
Generally speaking, install FC additional after, the compensation range of SVC is generally 0～+ 100%.And can reach-100%～+ 100% based on the compensation range of full-control type device convertor assembly, more powerful guarantee is provided for the stable operation of electric power system.
5) influence by voltage not
SVC is a kind of passive solution, and its output offset current is directly proportional with line voltage.When electrical network generation sub-synchronous oscillation, grid voltage change is bigger, and the ability of SVC inhibition sub-synchronous oscillation weakens greatly when the voltage trough.
And be a kind of active solution based on full-control type device convertor assembly, its output offset current almost has nothing to do with line voltage.That is to say, when line voltage fall to rated voltage 30% the time, can also export specified electric current based on full-control type device convertor assembly, make to suppress the ability of sub-synchronous oscillation and strengthen greatly.
6) the meritorious adjusting
This is based on another great advantages that full-control type device convertor assembly suppresses the sub-synchronous oscillation scheme.When electrical network was in stable operation, current transformer can absorb and store a certain amount of meritorious energy; When sub-synchronous oscillation took place, current transformer just can provide a certain amount of meritorious energy to electrical network when sending idle inhibition sub-synchronous oscillation, suppressed vibration fast, improved the stability and the reliability of electrical network.
7) filled up the technological gap that utilizes full-control type device Semiconductor Converting Technology to suppress sub-synchronous oscillation, suppressed having control convenient, simple in structure aspect the sub-synchronous oscillation, advantage such as with low cost.
8) every sub-synchronous oscillation restraining device can suppress the sub-synchronous oscillation of separate unit or many generating sets simultaneously.
9) two sub-synchronous oscillation restraining devices of two controller compositions can be realized the inhibition to the sub-synchronous oscillation of two generating sets, when a device that suppresses sub-synchronous oscillation during in maintenance or fault, can guarantee that still subsynchronous oscillation of generator set is effectively controlled, the operation of not influence system.
10) when there are many generating sets at the scene, can finish the collection of multimachine tach signal by the signal processing unit of extending controller, the associated components in other controllers is constant.
Description of drawings
Fig. 1 is the structure chart that the subsynchronous oscillation of generator set of full-control type current device suppresses;
Fig. 2 is the control principle figure that the subsynchronous oscillation of generator set of full-control type current device suppresses;
Fig. 3 is the SVG control block diagram when adopting indirect current control method (voltage method);
Fig. 4 is the SVG control block diagram when adopting Direct Current Control method (current method);
Fig. 5 is voltage-dropping type two level power unit parallel connection type SVG structural representations;
Fig. 6 is voltage-dropping type three level power unit parallel connection type SVG structural representations;
Fig. 7 is a voltage-dropping type Δ type chain type SVG structural representation;
Fig. 8 is a voltage-dropping type Y type chain type SVG structural representation;
Fig. 9 is a voltage-dropping type MMC type SVG structural representation;
Figure 10 is multipleization of a voltage-dropping type SVG structural representation;
Figure 11 is non-voltage-dropping type device tandem type two level SVG structural representations;
Figure 12 is non-voltage-dropping type device tandem type three level SVG structural representations;
Figure 13 is a direct hanging type Δ type chain type SVG structural representation;
Figure 14 is a direct hanging type Y type chain type SVG structural representation;
Figure 15 is a direct hanging type MMC type SVG structural representation.
Embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Subsynchronous oscillation of generator set inhibition method based on the full-control type current device, this method is a controlled quentity controlled variable with the variable quantity of the tach signal of generating set, this tach signal variable quantity via controller is carried out filtering, phase shift, ratio amplification, calculation process, obtain with the voltage synchronizing signal is the control signal of benchmark control unsteady flow power cell, make the full-control type convertor assembly produce subsynchronous mode modulated current, this electric current reaches the purpose that suppresses subsynchronous oscillation of generator set through the rotating speed of power delivery cell influence generating set.
See Fig. 1, subsynchronous oscillation of generator set inhibition method based on the full-control type current device, its device comprises speed measuring cabinet 6, controller 7, static reacance generator SVG device 4, step-down transformer 3, speed measuring cabinet 6 is connected with the output of generator 1, speed measuring cabinet 6 other ends connect controller 7 by optical cable, the controller other end connects static reacance generator SVG device 4, and SVG device 4 other ends connect step-down transformer 3, step-down transformer 3 another termination 500kV buses via the 35kV bus; The input of the voltage transformer pt 8 of 35kV bus and current transformer CT 9 access controllers 7.Generator 1 links to each other with the 500kV bus via 20kV bus, step-up transformer 2.
According to user's needs, can on the 35kV bus, set up FC inductance capacitance device, or not add the FC device.
See Fig. 2, controller comprises a plurality of signal processing subelements and master control subelement, and each signal processing subelement comprises filtration module, phase shift block, ratio amplification module, computing module, and the master control subelement is finished the control to the full-control type device;
See Fig. 1, two-way tach signal ω a1, the ω b1 of generator 1 insert speed measuring cabinet 6, two-way output signal ω _ a1, the ω of speed measuring cabinet 6 _ b1 optical cable access controller 7, the control signal of controller 7 inserts the signal input part of full-control type current device SVG device 4, and SVG device 4 inserts the 500KV bus via 35kV bus, step-down transformer 3.
See Fig. 2, based on the subsynchronous oscillation of generator set inhibition method of full-control type current device, control method may further comprise the steps:
1) the generator speed signals collecting, with the rated rotational frequency signal relatively obtain variable quantity; See Fig. 1, speed measuring cabinet converts generator speed signal of telecommunication ω a1, ω b1 to high frequency light signal ω _ a1, ω _ b1, generator speed high frequency light signal ω _ a1, ω _ b1 transfer signal of telecommunication ω a1, ω b1 to by optical-electrical converter K1, and ω a1, ω b1 and rated rotational frequency signal ω 0 relatively obtain difference DELTA ω a1, Δ ω b1 through comparator K2;
2) filtering; Difference DELTA ω a1, Δ ω b1 filter the high frequency low frequency through low pass high pass filter K3, carry out bandpass filtering through band pass filter 1 to the band pass filter 3 among the band pass filter K4 again, obtain subsynchronous mode one, subsynchronous mode two, subsynchronous mode three subsynchronous modal components signals;
3) phase place is corrected; The phase shift block K5 that above-mentioned subsynchronous modal components signal is crossed respectively separately again corrects phase place,
4) ratio is amplified; Signal after the rectification phase place carries out the gain ratio through ratio amplification module K6 again and amplifies;
5) calculation process; All subsynchronous modal components through correcting phase place, ratio amplification obtain the Comprehensive Control amount Brb1 of Comprehensive Control amount Bra1, the Δ Wb1 of Δ Wa1 through sum unit K7 summation; Comprehensive Control amount Δ Bra1 and Comprehensive Control amount Δ Brb1 through asking averaging unit K8, are obtained the Comprehensive Control amount of two tach signals;
6) above-mentioned Comprehensive Control amount becomes the IGBT triggering constantly through function F (br) K9.Controller is that synchronizing signal control IGBT triggers constantly with the PT signal, makes the reactive current that flows through the subsynchronous component modulation that is obtained by the generator speed signal in the SVG device, finally influences the rotating speed of generator, reaches the purpose that suppresses sub-synchronous oscillation.
In the present embodiment, the full-control type current device is IGBT, also can be IGBT, GTO, IGCT, IEGT or other full-controlled switch device.
The SVG device comprises two types of voltage-dropping type and direct hanging types, and FC partly belongs to optional part.
In addition, an IGBT among the figure can be single Zhi Kaiguan device, also can be the serial or parallel connection of many IGBT.
Fig. 3 is the SVG control block diagram when adopting indirect current control method (voltage method).
Fig. 4 is the SVG control block diagram when adopting Direct Current Control method (current method).
Concrete structure type below in conjunction with accompanying drawing narration SVG device.
Fig. 5 is voltage-dropping type two level power unit parallel connection type SVG structural representations; Power cell is every to be made up of two inverse parallel switching device IGBT1, diode D1 rectification, and whole power model forms two level current transformer functions.
Voltage-dropping type two level power unit parallel connection type SVG are by the power cell parallel connection of adopting two level current transformers, rise to high-voltage parallel on electrical network by transformer T1 then.Voltage-dropping type two level power unit parallel connection type SVG mainly are made up of power cell, control unit, step-down transformer.
Fig. 6 is voltage-dropping type three level power unit parallel connection type SVG structural representations; Power cell is every to be made up of four inverse parallel switching device IGBT2, diode D2 clamper, and whole power model forms the three-level current transformer function.
Voltage-dropping type three level power unit parallel connection type SVG are by the power cell parallel connection of the three-level current transformer that adopts diode D2 clamper, rise to high-voltage parallel on electrical network by transformer T2 then.Voltage-dropping type three level power unit parallel connection type SVG mainly are made up of power cell, control unit, step-down transformer.
Fig. 7 is a voltage-dropping type Δ type chain type SVG structural representation; Individual event power cell A1 is every to be made up of four inverse parallel switching device IGBT3, diode D3 rectification, and whole power model forms the three-level current transformer function.
Voltage-dropping type Δ type chain type SVG is connected in series to the certain voltage grade by individual event power cell A1, and the three-phase Δ connects the back and rises to high-voltage parallel on electrical network by transformer T3.Voltage-dropping type Δ type chain type SVG mainly is made up of power cell, control unit, step-down transformer.
Fig. 8 is a voltage-dropping type Y type chain type SVG structural representation; Individual event power cell A2 is every to be made up of four inverse parallel switching device IGBT4, diode D4 rectification, and whole power model forms the three-level current transformer function.
Voltage-dropping type Y type chain type SVG is connected in series to the certain voltage grade by individual event power cell A2, rises to high-voltage parallel on electrical network by transformer T4 behind the three-phase Y connection.Voltage-dropping type Y type chain type SVG mainly is made up of power cell, control unit, step-down transformer.
Fig. 9 is a voltage-dropping type MMC type SVG structural representation; The abbreviation of modular multilevel current transformer (Modular MultilevelConverter) is a MMC type current transformer.MMC type current transformer and three-phase bridge current transformer are similar.Each brachium pontis is composed in series by a plurality of single-phase semi-bridge A3 that IGBT5 forms, and each brachium pontis mid point inserts step-down transformer T5 secondary side behind reactor L1.
Figure 10 is multipleization of a voltage-dropping type SVG structural representation; Multipleization of voltage-dropping type SVG is by a plurality of transformer T1, T2 ... Tn forms, and wherein, all current transformers 10 can shared one or more dc capacitor C, also can dispose electric capacity separately, and the effect of electric capacity is to provide operate as normal required direct voltage to current transformer.Current transformer 10 is made of three with common DC bus single-phase H bridges usually, and the output of each H bridge is connected to the low-pressure side of transformer.In the high-pressure side of each transformer, corresponding incorporate system into after respectively being in series.In addition, the method for the former secondary phase shift of transformer is adopted in the influence that the low-order harmonic that produces for the cancellation current transformer causes electrical network usually, connect as Y/Y, or the Y/ Δ connects (as Figure 10).
Figure 11 is non-voltage-dropping type device tandem type two level SVG structural representations; Non-voltage-dropping type device tandem type two level SVG form high-voltage power unit A4 by power device IGBT6 series connection earlier, and the high-voltage power unit A4 of these power device series connection reconstructs the output of two level and inserts electrical network then.Non-voltage-dropping type device tandem type two level SVG mainly are made up of power device Series Sheet unit, control unit, access reactor.
Figure 12 is non-voltage-dropping type device tandem type three level SVG structural representations; Non-voltage-dropping type device tandem type three level SVG form high-voltage power unit A5 by power device IGBT7 series connection earlier, and the high-voltage power unit A5 of these power device series connection reconstructs the output of three level and inserts electrical network then.Non-voltage-dropping type device tandem type three level SVG mainly are made up of power device Series Sheet unit, control unit, access reactor.
Figure 13 is a direct hanging type Δ type chain type SVG structural representation; Individual event power cell A6 is every to be made up of four inverse parallel switching device IGBT8, diode D9 rectification, and whole power model forms the three-level current transformer function.
Direct hanging type Δ type chain type SVG directly is connected in series to voltage levels by individual event power cell A6, and the three-phase Δ connects the back and directly inserts electrical network.Direct hanging type Δ type chain type SVG mainly is made up of power cell, control unit, access reactor.
Figure 14 is a direct hanging type Y type chain type SVG structural representation; Individual event power cell A7 is every to be made up of four inverse parallel switching device IGBT9, diode D10 rectification, and whole power model forms the three-level current transformer function.
Direct hanging type Y type chain type SVG directly is connected in series to voltage levels by individual event power cell A7, directly inserts electrical network behind the three-phase Y connection.Direct hanging type Y type chain type SVG mainly is made up of power cell, control unit, access reactor.
Figure 15 is a direct hanging type MMCC type SVG structural representation.Each brachium pontis of MMC type current transformer is composed in series by a plurality of single-phase semi-bridge A8, and each brachium pontis mid point directly inserts electrical network through reactor L2, does not need step-down transformer.
Claims (9)
1. based on the subsynchronous oscillation of generator set inhibition method of full-control type current device, it is characterized in that, this method is a controlled quentity controlled variable with the variable quantity of the tach signal of generating set, this tach signal variable quantity via controller is carried out filtering, phase shift, ratio amplification, calculation process, obtain with the voltage synchronizing signal is the control signal of benchmark control unsteady flow power cell, make the full-control type convertor assembly produce subsynchronous mode modulated current, this electric current reaches the purpose that suppresses subsynchronous oscillation of generator set through the rotating speed of power delivery cell influence generating set; Described controller comprises a plurality of signal processing subelements and master control subelement, and each signal processing subelement comprises filtration module, phase shift block, ratio amplification module and computing module, and the master control subelement is finished the control to the full-control type device;
Described filtration module comprises low pass, high pass filter and the band pass filter that each subsynchronous mode signal is carried out filtering respectively, be used for the variable quantity of tach signal is filtered low frequency, high frequency through low pass, high pass filter, handle through band pass filter again, obtain subsynchronous modal components;
The subsynchronous mode signal that described phase shift block is used for accepting filter unit output carries out phase place with subsynchronous mode signal and corrects;
Described ratio module is used for the subsynchronous mode signal that phase shift is handled is carried out the ratio processing and amplifying;
Described computing module is used for that the subsynchronous mode signal after phase shift, the ratio processing is weighted summation and handles the Comprehensive Control amount that obtains; This controlled quentity controlled variable is become the control signal of full-control type convertor assembly by functional operation.
2. the subsynchronous oscillation of generator set inhibition method based on the full-control type current device according to claim 1, it is characterized in that described full-control type convertor assembly is voltage-dropping type two level power unit parallel connection type SVG structures or voltage-dropping type three level power unit parallel connection type SVG structures;
Voltage-dropping type two level power unit parallel connection type SVG structures are by the power cell parallel connection of adopting two level current transformers, rise to high-voltage parallel on electrical network by step-down transformer T1 then; Described power cell is every to be made up of two inverse parallel switching device IGBT1, diode D1 rectification, and whole power model forms two level current transformers;
Voltage-dropping type three level power unit parallel connection type SVG structures are by the power cell parallel connection of the three-level current transformer that adopts diode D2 clamper, rise to high-voltage parallel on electrical network by step-down transformer T2 then; The power cell of described three-level current transformer is every to be made up of four inverse parallel switching device IGBT2, diode D2 clamper, and whole power model forms three-level current transformer.
3. the subsynchronous oscillation of generator set inhibition method based on the full-control type current device according to claim 1 is characterized in that, described full-control type convertor assembly is voltage-dropping type △ type chain type SVG structure or voltage-dropping type Y type chain type SVG structure;
Voltage-dropping type △ type chain type SVG structure is to be connected in series to the certain voltage grade by individual event power cell A1, and three-phase △ connects the back and rises to high-voltage parallel on electrical network by step-down transformer T3; Described individual event power cell A1 is every to be made up of four inverse parallel switching device IGBT3, diode D3 rectification, and whole power model forms three-level current transformer;
Voltage-dropping type Y type chain type SVG is connected in series to the certain voltage grade by individual event power cell A2, rises to high-voltage parallel on electrical network by step-down transformer T4 behind the three-phase Y connection; Described individual event power cell A2 is every to be made up of four inverse parallel switching device IGBT4, diode D4 rectification, and whole power model forms three-level current transformer.
4. the subsynchronous oscillation of generator set inhibition method based on the full-control type current device according to claim 1 is characterized in that, described full-control type convertor assembly is voltage-dropping type MMC type SVG structure or multipleization of voltage-dropping type SVG structure;
Each brachium pontis of voltage-dropping type MMC type SVG structure is composed in series by a plurality of single-phase semi-bridge A3 that IGBT5 forms, and each brachium pontis mid point inserts step-down transformer T5 secondary side behind reactor L1;
Multipleization of voltage-dropping type SVG structure is by a plurality of transformer T1, T2 ... Tn forms, and wherein, the shared direct current of all current transformers perhaps each current transformer disposes electric capacity separately; Current transformer is made of three with common DC bus single-phase H bridges, and the output of each H bridge is connected to the low-pressure side of transformer; In the high-pressure side of each transformer, corresponding incorporate system into after respectively being in series.
5. the subsynchronous oscillation of generator set inhibition method based on the full-control type current device according to claim 1, it is characterized in that described full-control type convertor assembly is non-voltage-dropping type device tandem type two level SVG structures or non-voltage-dropping type device tandem type three level SVG structures;
Non-voltage-dropping type device tandem type two level SVG structures are to form high-voltage power unit A4 by power device IGBT6 series connection earlier, and the high-voltage power unit A4 of these power device series connection reconstructs the output of two level and inserts electrical network by reactor then;
Non-voltage-dropping type device tandem type three level SVG structures are to form high-voltage power unit A5 by power device IGBT7 series connection earlier, and the high-voltage power unit A5 of these power device series connection reconstructs the output of three level and inserts electrical network by reactor then.
6. the subsynchronous oscillation of generator set inhibition method based on the full-control type current device according to claim 1, it is characterized in that described full-control type convertor assembly is direct hanging type △ type chain type SVG structure, direct hanging type Y type chain type SVG structure or direct hanging type MMC type SVG structure;
Direct hanging type △ type chain type SVG directly is connected in series to voltage levels by individual event power cell A6, and three-phase △ connects the back and directly inserts electrical network; Described individual event power cell A6 is every to be made up of four inverse parallel switching device IGBT8, diode D9 rectification, and whole power model forms three-level current transformer;
Direct hanging type Y type chain type SVG directly is connected in series to voltage levels by individual event power cell A7, and three-phase Y connection is after reactor directly inserts electrical network; Described individual event power cell A7 is every to be made up of four inverse parallel switching device IGBT9, diode D10 rectification, and whole power model forms three-level current transformer;
Each brachium pontis of direct hanging type MMC type SVG structure is composed in series by a plurality of single-phase semi-bridge A8, and each brachium pontis mid point directly inserts electrical network through reactor L2.
7. according to any described subsynchronous oscillation of generator set inhibition method among the claim 1-6 based on the full-control type current device, it is characterized in that described full-control type semiconductor switch device that convertor assembly adopts is IGBT, GTO, IGCT or IEGT full-controlled switch device.
8. the subsynchronous oscillation of generator set inhibition method based on the full-control type current device according to claim 1 is characterized in that the subsynchronous oscillation of generator set restraining device that this method adopted is one or more, carries out Redundancy Design.
9. the subsynchronous oscillation of generator set inhibition method based on the full-control type current device according to claim 1 is characterized in that the subsynchronous oscillation of generator set restraining device that this method adopted suppresses the sub-synchronous oscillation of one or more generating set.
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| CN2009101876483A CN101692579B (en) | 2009-09-27 | 2009-09-27 | Full-controlled variable current device based sub-synchronous oscillation suppression method for generating set |
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| CN102142684B (en) * | 2011-03-18 | 2013-04-17 | 株洲变流技术国家工程研究中心有限公司 | High-voltage direct-hanging type scalable vector graphics (SVG) comprehensive control device and comprehensive control method |
| CN102185283B (en) * | 2011-04-01 | 2014-01-29 | 南京南瑞继保电气有限公司 | Method for sub-synchronous current calculation and sub-synchronous over-current and divergent protection of generator |
| CN102244389A (en) * | 2011-07-08 | 2011-11-16 | 荣信电力电子股份有限公司 | Method for solving imbalance of three-phase currents and managing negative sequence based on SVG (scalable vector graphics) device |
| CN103124077B (en) * | 2011-11-18 | 2015-09-23 | 北京睿能世纪科技有限公司 | Suppress the system and method for generating set subsynchronous resonance |
| IN2014MN01647A (en) * | 2012-03-01 | 2015-05-22 | Alstom Technology Ltd | |
| CN102780416B (en) * | 2012-08-15 | 2015-04-22 | 株洲变流技术国家工程研究中心有限公司 | Modularization-based multi-level converter flexible direct current transmission device and system thereof |
| WO2014094271A1 (en) * | 2012-12-20 | 2014-06-26 | Abb Technology Ltd. | Coordinated control method of generator and svc for improving power plant active power throughput and controller thereof |
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| US9318974B2 (en) | 2014-03-26 | 2016-04-19 | Solaredge Technologies Ltd. | Multi-level inverter with flying capacitor topology |
| CN104333022B (en) * | 2014-11-17 | 2016-12-07 | 梦网荣信科技集团股份有限公司 | A kind of based on the SVG suppression grid-connected sub-synchronous oscillation method caused of blower fan |
| 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 |
| CN105071409B (en) * | 2015-08-28 | 2017-10-17 | 中国神华能源股份有限公司 | A kind of subharmonic reactive generating device |
| CN105181014A (en) * | 2015-08-28 | 2015-12-23 | 中国神华能源股份有限公司 | Subsynchronous oscillation monitoring system and method |
| CN105207236B (en) * | 2015-09-16 | 2018-02-02 | 北京思源清能电气电子有限公司 | Suppression sub-synchronous oscillation adaptive control system based on SVG |
| CN108173271B (en) * | 2016-12-07 | 2020-01-10 | 南京南瑞继保电气有限公司 | Subsynchronous oscillation damping control system with redundant structure |
| CN109830969B (en) * | 2018-09-13 | 2023-05-19 | 国网青海省电力公司 | Method and system for inhibiting subsynchronous oscillation of thermal power generating unit |
| CN113193576A (en) * | 2021-06-10 | 2021-07-30 | 荣信汇科电气股份有限公司 | Method for restraining subsynchronous transient oscillation of generator set |
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