CN105186475A - Bypass unit, bypass device and subsynchronous oscillation suppression system - Google Patents
Bypass unit, bypass device and subsynchronous oscillation suppression system Download PDFInfo
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- CN105186475A CN105186475A CN201510542099.2A CN201510542099A CN105186475A CN 105186475 A CN105186475 A CN 105186475A CN 201510542099 A CN201510542099 A CN 201510542099A CN 105186475 A CN105186475 A CN 105186475A
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Abstract
The invention relates to the technical field of power grids, and discloses a bypass unit, a bypass device and a subsynchronous oscillation suppression system. The bypass unit is matched with one H-bridge power unit in a subsynchronous oscillation controller and comprises a crow-bar protection circuit and a contactor; the crow-bar protection circuit is connected with the H-bridge power unit in parallel; and the contactor is connected between two alternating-current output ends of the H-bridge power unit and is used for triggering the corresponding crow-bar protection circuit when the H-bridge power unit is in a fault, so that the crow-bar protection circuit shunts the fault current. The bypass device comprises the bypass units which are the same as the H-bridge power units in the subsynchronous oscillation controller in quantity; and each H-bridge power unit is electrically connected with one bypass unit correspondingly. The subsynchronous oscillation suppression system comprises the bypass device, and is used for injecting the current required for suppressing subsynchronous oscillation into a generator set and a power grid through the corresponding bypass unit when one H-bridge power unit is in the fault. According to the bypass unit, the bypass device and the subsynchronous oscillation suppression system, the operation stability of the subsynchronous oscillation controller is improved.
Description
Technical field
The present invention relates to electric power network technique field, particularly, relate to a kind of by-pass unit, shunting device and sub-synchronous oscillation and suppress system.
Background technology
Along with the continuous expansion of network system, super high voltage direct current electricity transmission and heavy-duty generator group demand are also in improve, for reducing line transmission loss, conventional controlled series compensation improves voltage on line side at present, although the great economic benefit brought, but bring new trouble also to the safe and stable operation of generating set, subsynchronous oscillation of electrical power system is one of wherein comparatively serious problem.
At present, have a variety of to the method that sub-synchronous oscillation suppresses, also create the device of various suppression sub-synchronous oscillation.Wherein, suppress sub-synchronous oscillation to be the technology that research is more recently by controlling wholly-controled device, the maturation of static reacance generator (SVG) is that further developing of sub-synchronous oscillation suppression technology provides good basis.Based on static reacance generator, increasing subsynchronous oscillation damping controls also to start to be developed, and achieves good effect in actual applications.
In actual applications, sub-synchronous oscillation controller plays an important role for protection alternator shaft, prolongation generator life-span, therefore also requires that sub-synchronous oscillation controller can long-time stable reliably run.To this, the present invention proposes a kind of by-pass unit, shunting device and sub-synchronous oscillation and suppress system, to ensure the reliability of sub-synchronous oscillation controller.
Summary of the invention
The object of this invention is to provide a kind of by-pass unit, shunting device and sub-synchronous oscillation and suppress system, for solving the problem of the performance protection of sub-synchronous oscillation controller.
To achieve these goals, technical scheme of the present invention provides the by-pass unit of the H bridge power unit in a kind of sub-synchronous oscillation controller, comprising: crow-bar protection circuit, and it is in parallel with described H bridge power unit; And contactor, it is connected between two ac output ends of described H bridge power unit, for when H bridge power unit has fault, triggers corresponding crow-bar protection circuit, shunts to make described crow-bar protection circuit to fault current.
Technical scheme of the present invention additionally provides a kind of shunting device of sub-synchronous oscillation controller, comprising: above-mentioned by-pass unit; Wherein, described by-pass unit is configured to identical with the H bridge power unit quantity in sub-synchronous oscillation controller, and each H power cell correspondence electrical connection described by-pass unit.
On the basis of technique scheme, technical scheme of the present invention is preferably each H bridge power unit and is parallel with a storage capacitor, and this storage capacitor is used for obtaining electric energy from electrical network, and for powering to described by-pass unit.
Technical scheme of the present invention additionally provides a kind of sub-synchronous oscillation and suppresses system, comprising: sub-synchronous oscillation controller; And the shunting device of above-mentioned described sub-synchronous oscillation controller.
Pass through technique scheme, the present invention has following beneficial effect: the operation stability that improve sub-synchronous oscillation controller, effectively ensure that the sub-synchronous oscillation inhibition when H bridge power unit breaks down, and be conducive to the floor space reducing costs and reduce equipment simultaneously.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the structural representation of the system of carrying out sub-synchronous oscillation suppression in prior art;
Fig. 2 is the structural representation of the sub-synchronous oscillation controller of Y-connection;
Fig. 3 is the structural representation of the sub-synchronous oscillation controller that triangle connects;
Fig. 4 is the structural representation of Y chain link formula SVG;
Fig. 5 is the structural representation of the by-pass unit in embodiments of the invention one;
Fig. 6 is the high-order schematic diagram getting energy supply power mode in embodiments of the invention one;
Fig. 7 is the structural representation of the embodiment one BUCK circuit that this has;
Fig. 8 is the structural representation that in embodiments of the invention two, sub-synchronous oscillation suppresses system;
Fig. 9 is the current direction schematic diagram of H bridge power unit when normally running;
Figure 10 is the current direction schematic diagram of H bridge power unit when breaking down.
Description of reference numerals
1, H bridge power unit; 2, crow-bar protection circuit; 3, contactor; 4, storage capacitor; 5, chopper circuit; 6, main control unit; 7, Switching Power Supply; 8, thyristor trigger board.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Embodiment one
As shown in Figure 1, in electric power system, generating set to electrical network transmission of electric energy, is the loss reducing transmission line by transformer and transmission line, and normal employing increases the conveying capacity that method that string mends improves transmission line at present.But, this method increasing string benefit also may cause sub-synchronous oscillation problem, generating set is run with the frequency of oscillation lower than synchronizing frequency, has a strong impact on the fail safe of electric power system, therefore power plant employs a lot of device suppressing sub-synchronous oscillation, as sub-synchronous oscillation controller.
Equally as shown in Figure 1, the cardinal principle of employing sub-synchronous oscillation controller suppression sub-synchronous oscillation is: the tach signal being obtained generating set by speed measuring device, control device generates the driving pulse for driving sub-synchronous oscillation controller based on this tach signal, sub-synchronous oscillation controller generates the electric current for suppressing sub-synchronous oscillation under the driving of driving pulse, and by transformer by this pulse current injectingt in generating set and electrical network.
Known, sub-synchronous oscillation controller is the core that whole sub-synchronous oscillation suppresses, and needs to ensure that it still can normally can run under fraction fault condition.And sub-synchronous oscillation controller develops on the basis of static reacance generator; therefore sub-synchronous oscillation controller generally includes several H bridge power units; H bridge power unit breaks down, one of major failure situation becoming sub-synchronous oscillation controller; thus the present embodiment is based on H bridge power unit, propose a kind of bypass protection scheme.For clearly describing the scheme of the present embodiment, first introduced the structure of the H bridge power unit in conventional sub-synchronous oscillation controller below by Fig. 2 to Fig. 4.
Usually, sub-synchronous oscillation controller can adopt star-like (as shown in Figure 2) or triangle (as shown in Figure 3) connected mode access electrical network, to electrical network Injection Current, or absorbs active current for the charging of its storage capacitor by electrical network.In Fig. 2 and Fig. 3, A, B, C represent three phase network, and H_A1 bridge-H_C6 bridge represents the H bridge power unit of H bridge construction, and Vdc_A1 to Vdc_C6 represents the magnitude of voltage on the storage capacitor that each H bridge power unit is corresponding.
In the present embodiment, described sub-synchronous oscillation controller preferably adopts chain type SVG, as shown in Figure 4, several H bridge power units (as shown in dotted outline in FIG.) that have often been in series of this chain type SVG, described H bridge power unit comprises four antiparallel switching device IGBT or IEGT, and each H bridge power unit is all parallel with a storage capacitor, namely the technical scheme proposed in the present embodiment is launch for the H bridge power unit of this structure.In addition, for coordinating the driving of respective switch device, can also be deploy switch power supply, expansion board etc. in H bridge power unit.
Based on the structure of above-mentioned H bridge power unit, as shown in Figure 5, present embodiments provide the by-pass unit of the H bridge power unit 1 in a kind of sub-synchronous oscillation controller, comprising: crow-bar protection circuit 2, it is in parallel with described H bridge power unit; And contactor 3; it is connected between two ac output ends of described H bridge power unit; for when H bridge power unit has fault; trigger corresponding crow-bar protection circuit; make electric current flow through the thyristor of crowbar unit inside, resistance and inductance, thus described crow-bar protection circuit is shunted fault current.
As shown in Figure 5; described crow-bar protection circuit preferably comprises thyristor, inductance and the resistance of connecting successively; the anode of described thyristor and one end of described resistance connect described H bridge power unit respectively, and the negative electrode of described thyristor is then connected by described inductance with the other end of described resistance.Described thyristor is preferably reverse-blocking tetrode thyristor device; thus described trigger triggers described crow-bar protection circuit; mainly namely thyristor is wherein triggered; according to the control principle of reverse-blocking tetrode thyristor device; for ease of realizing the control of trigger to gate circuit transistor gate; a thyristor trigger board can be set between contactor and thyristor, trigger described thyristor by this thyristor trigger board.
In addition, while crow-bar protection circuit operation, for assurance device still can normally run, do not affect other power cells, arrange contactor at AC, while crowbar action, contactor closes a floodgate, thus makes alternating current by other power cells.
It should be noted that, in order to can the annexation of the more clearly structure of by-pass unit and itself and H bridge power unit, Fig. 5 only illustrates with a H bridge power unit, the sub-synchronous oscillation controller architecture of corresponding diagram 2-Fig. 4 in reality, includes multiple by-pass unit of multiple H bridge power unit and correspondence.
Therefore, the by-pass unit that Fig. 5 illustrates combined with the sub-synchronous oscillation controller that Fig. 2-Fig. 4 illustrates, the present embodiment additionally provides a kind of shunting device of sub-synchronous oscillation controller, comprising: above-mentioned by-pass unit; Wherein, described by-pass unit is configured to identical with the H bridge power unit quantity in sub-synchronous oscillation controller, and each H power cell correspondence electrical connection described by-pass unit.
In the present embodiment, H bridge power unit 1 is parallel with storage capacitor 4, and crow-bar protection circuit 2 described in this storage capacitor 4 and described contactor 3 are all in parallel, this storage capacitor 4 for obtaining electric energy from electrical network, and for powering to described by-pass unit.Sub-synchronous oscillation controller can absorb electric network active electric current and charge for this storage capacitor 4, and by-pass unit is then direct obtains power supply from storage capacitor 4, and this is that the high position for shunting device designed by the present embodiment gets can supply power mode.A described high position is got when can namely be and start and is charged to DC bus by electrical network, and this supply power mode is conducive to the validity ensureing by-pass unit.If do not utilize storage capacitor to power; but adopt the power supply such as supply module (as electric capacity) in by-pass unit self; then when H bridge power unit breaks down; crow-bar protection circuit runs; corresponding supply module repid discharge, may cause contactor power-off and cannot complete bypass commands.
A this high position gets the stability that energy supply power mode is conducive to ensureing shunting device; but; voltage on the storage capacitor of sub-synchronous oscillation controller DC side is generally the voltage of kilovolt; it can not be directly the crow-bar protection circuit supply of shunting device; therefore, design chopper circuit is also needed to provide suitable direct voltage for it.
As shown in Figure 6; chopper circuit 5 is connected between described storage capacitor and described crow-bar protection circuit 2 and described contactor 3; for being the direct voltage of 110V by the convert of capacitor to voltage on described storage capacitor, and supply described crow-bar protection circuit and described trigger.In addition, described chopper circuit 5 is connected with a main control unit 6, and this main control unit 6 is for controlling the direct voltage of described chopper circuit 5 stable output.This main control unit 6 directly can adopt master control borad conventional in prior art, utilizes Closed-loop Control Strategy etc. to control the operation of chopper circuit 5.
In addition, the switching devices such as usual thyristor, IGBT are triggered by corresponding thyristor trigger board, and the operating voltage of master control borad, thyristor trigger board etc. is 24V, therefore in figure 6, the input of described chopper circuit connects described storage capacitor 4, first voltage output end and connects described contactor 3, second voltage output end and then connect a Switching Power Supply 7, the direct voltage of 110V is converted to the direct voltage of 24V by described Switching Power Supply 7, resupplies master control borad, thyristor trigger board etc.As shown in Figure 6, thyristor trigger board 8 is arranged on Switching Power Supply 7 and main control unit 6 on the path of crow-bar protection circuit supply, for triggering corresponding thyristor.In addition, described Switching Power Supply 7 directly can select the Switching Power Supply that H bridge power unit carries, and also can be set to independently Switching Power Supply.
In the present embodiment, described chopper circuit is voltage-dropping type chopper circuit, i.e. BUCK circuit, as shown in Figure 7, give the basic circuit diagram of BUCK circuit, the output valve of this BUCK circuit is always less than its input value, whether the circuit exported is continuous, depend on the size of inductance, electric capacity and switching frequency, adopt PI to control, the direct voltage of BUCK circuit stable output can be realized.
The bypass mode of the present embodiment improves the stability of sub-synchronous oscillation controller, plays a very good protection to generating set.
Embodiment two
On the basis of the shunting device of embodiment one, this gives a kind of sub-synchronous oscillation and suppress system, it shunting device comprising sub-synchronous oscillation controller and implement in one, this shunting device coordinates time same oscillating controller frequently application.In addition, also comprising: control device, during for having H bridge power unit to break down in described sub-synchronous oscillation controller, driving described shunting device to run to shunt fault current.
As shown in Figure 8, this sub-synchronous oscillation suppresses system to detect the tach signal of generating set by speed measuring device.Described control device, then according to the tach signal that described speed measuring device detects, generates the control command driving described sub-synchronous oscillation controller to run; Described sub-synchronous oscillation controller comprises several H bridge power units, produces for the control command according to described control device the electric current suppressed needed for sub-synchronous oscillation, and by this pulse current injectingt in generating set and electrical network.
In the present embodiment, described shunting device matches with described sub-synchronous oscillation controller, during for having H bridge power unit to break down in described sub-synchronous oscillation controller, under the control of described control device, shunts fault current.
The sub-synchronous oscillation controller related in the present embodiment and shunting device identical with embodiment one, be not repeated here.
When institute H bridge power unit normally works, electric current needed for described suppression sub-synchronous oscillation is by H bridge power unit, be injected in generating set and electrical network through transformer again, and when there being H bridge power unit to break down, electric current needed for described suppression sub-synchronous oscillation is injected in generating set and electrical network by the by-pass unit that the H bridge power unit that breaks down is corresponding, as shown in FIG. 9 and 10.The flow direction of the arrow signal electric current in Fig. 9 and Figure 10, in fig .9, when H bridge power unit normally works, electric current all flows through H bridge power unit, as in Figure 10, when H bridge power unit breaks down, H bridge power unit is bypassed, and electric current all flows through by-pass unit corresponding to trigger end.
By arranging corresponding by-pass unit to H bridge power unit, the system of the suppression sub-synchronous oscillation of the present embodiment, when there being H bridge power unit to break down, still can normally be run, and effectively ensure that the stability suppressing sub-synchronous oscillation.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned execution mode; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different execution mode of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a by-pass unit for the H bridge power unit (1) in sub-synchronous oscillation controller, is characterized in that, comprising:
Crow-bar protection circuit (2), it is in parallel with described H bridge power unit (1); And
Contactor (3); it is connected between two ac output ends of described H bridge power unit (1); for when H bridge power unit (1) has fault; trigger corresponding crow-bar protection circuit (2), to make described crow-bar protection circuit (2), fault current is shunted.
2. by-pass unit according to claim 1; it is characterized in that; described crow-bar protection circuit (2) comprises thyristor, inductance and the resistance of connecting successively, and the anode of described thyristor and the end of described resistance connect one end of described H bridge power unit (1) respectively.
3. a shunting device for sub-synchronous oscillation controller, is characterized in that, comprising:
By-pass unit described in several claims 1 or 2;
Wherein, described by-pass unit is configured to identical with H bridge power unit (1) quantity in sub-synchronous oscillation controller, and each H bridge power unit correspondence electrical connection described by-pass unit.
4. shunting device according to claim 3, it is characterized in that, each H bridge power unit (1) is parallel with a storage capacitor (4), this storage capacitor (4) for obtaining electric energy from electrical network, and for powering to described by-pass unit.
5. shunting device according to claim 4, it is characterized in that, chopper circuit (5) is connected with between described storage capacitor (4) and described by-pass unit, this chopper circuit (5) for being the direct voltage of 110V by the convert of capacitor to voltage on described storage capacitor (4), and supplies by-pass unit.
6. shunting device according to claim 5, it is characterized in that, described chopper circuit (5) is connected with a main control unit (6), and this main control unit (6) is for controlling the direct voltage of described chopper circuit (5) stable output.
7. shunting device according to claim 5, it is characterized in that, described chopper circuit (5) comprises two voltage output ends, and the first voltage output end connects described contactor (3), for providing the direct voltage of 110V to described contactor (3); Second voltage output end connects a Switching Power Supply (7), and the direct voltage of 110V is converted to the direct voltage of 24V by described Switching Power Supply (7).
8. shunting device according to claim 7; it is characterized in that; a thyristor trigger board (8) is connected with between described Switching Power Supply (7) and described crow-bar protection circuit (2); this thyristor trigger board (8) is for triggering the switching device work in described crow-bar protection circuit (2), and the direct voltage of 24V is supplied this thyristor trigger board (8) by described Switching Power Supply (7).
9. sub-synchronous oscillation suppresses a system, it is characterized in that, comprising:
Sub-synchronous oscillation controller; And
The shunting device of the sub-synchronous oscillation controller according to any one of claim 3 to 8.
10. sub-synchronous oscillation according to claim 9 suppresses system, it is characterized in that, also comprises:
Control device, when breaking down for there being H bridge power unit (1) in described sub-synchronous oscillation controller, drives described shunting device to run to shunt fault current.
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| CN201510542099.2A CN105186475A (en) | 2015-08-28 | 2015-08-28 | Bypass unit, bypass device and subsynchronous oscillation suppression system |
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| CN201510542099.2A CN105186475A (en) | 2015-08-28 | 2015-08-28 | Bypass unit, bypass device and subsynchronous oscillation suppression system |
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Cited By (1)
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Application publication date: 20151223 |