CN102315810A - Integrated gate commutated thyristor based high-power pumped storage unit starting system - Google Patents
Integrated gate commutated thyristor based high-power pumped storage unit starting system Download PDFInfo
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Abstract
The invention relates to an integrated gate commutated thyristor based high-power pumped storage unit starting system, and relates to the technical field of pumped storage units. The technical problems that the system structure is simplified, the harmonic content and reactive impact are reduced, and the efficiency is improved are solved. The system comprises a power grid, a synchronous motor, a static frequency conversion device, an excitation device and an on-grid switch, wherein the static frequency converter device comprises a filter, a step-up transformer, three frequency-converison-side thyristor power units and three step-down transformers, and the excitation device comprises an excitation-side transformer and an excitation-side thyristor power unit; and the armature winding of the synchronous motor is connected with the power grid through the on-grid switch, and is sequentially connected to the power grid through the static frequency converter device, a grid-side vacuum switch and a power-grid side mutual inductor, and the excitation winding of the synchronous motor is sequentially connected to the power grid through the excitation device, an excitation-side vacuum switch and an excitation-side mutual inductor. The system provided by the invention has good a torque characteristic, and can improve the on-grid success rate of the unit.
Description
Technical field
The present invention relates to the pumped storage machine set technology, particularly relate to a kind of technology of the starting high-power pumped storage unit system based on integral gate change transistor.
Background technology
Along with the raising of commercial power level and the construction energetically of generation of electricity by new energy, people are more and more urgent with the demand of hydroenergy storage station for peak regulation.Hydroenergy storage station can be used as generator operation when electrical network is in peak load, to electrical network electric energy is provided; When electrical network load at a low ebb, move as motor, drive water pump, draw back upper pond to the water of lower reservoir, it is subsequent use to do to convert electric energy to potential energy.Hydroenergy storage station can be brought into play multi-functionals such as peak-clipping and valley-filling, frequency modulation, phase modulation, emergency duty and black starting; Can effectively reduce fired power generating unit and participate in the number of times of peak regulation start and stop; Fired power generating unit can be undertaken the task of even not undertaking peak-clipping and valley-filling less; Thereby realize efficiently and smoothly operatedly, guarantee the mains supply reliability.Therefore, the hydroenergy storage station rational and effective is utilized, and can reduce conventional thermoelectricity peaking power source and build and fired power generating unit exhaust emission gas, and is significant to the service conditions and the protection environment that improve electric power system.
The startup of high-power pumped storage unit (more than the single-machine capacity 300MW) under pump operating condition is the problem that must consider.In the prior art; It is traditional silicon controlled thyristor frequency conversion device with SFC (static frequency-conversion device) employing that most of pumped storage unit pump operating condition starts; Because the characteristic and the circuit topology defective of silicon-controlled device; There are shortcomings such as complex structure, loss is big, start-up time is slow, harmonic content is high, reactive power impact is big in it, will have a negative impact to electrical network and motor.
Summary of the invention
To the defective that exists in the above-mentioned prior art; Technical problem to be solved by this invention provides that a kind of system configuration is succinct, control is accurate, easy to maintenance, harmonic content is little, reactive power impact is little, efficient is high; Torque factor is good, can improve the starting high-power pumped storage unit system based on integral gate change transistor of set grid-connection success rate.
In order to solve the problems of the technologies described above; A kind of starting high-power pumped storage unit system provided by the present invention based on integral gate change transistor; Comprise power supply network, synchronous machine, it is characterized in that: also comprise static frequency-conversion device, excitation unit and the switch that is incorporated into the power networks;
The armature winding of said synchronous machine connects power supply network through the switch that is incorporated into the power networks;
Said excitation unit comprises excitation side transformer and excitation side thyristor power cell; Said excitation side transformer a former limit winding, a secondary winding arranged; Its former limit winding is received power supply network through an excitation side vacuum switch, an excitation side instrument transformer successively, and its secondary winding is received the excitation winding of synchronous machine through excitation side thyristor power cell;
Said static frequency-conversion device comprises a filter, a step-up transformer, three frequency conversion side thyristor power cells and three step-down transformers, and said three frequency conversion side thyristor power cells are corresponding one by one with three step-down transformers;
Said step-down transformer has a former limit winding, two secondary windings; Each receives power supply network respectively through a grid side vacuum switch, a grid side instrument transformer successively the former limit winding of three step-down transformers;
Said frequency conversion side thyristor power cell has an input, a feeder ear, two outputs; Its two outputs are respectively first output, second output; The input of each frequency conversion side thyristor power cell and feeder ear are received two secondary windings of corresponding step-down transformer respectively, and second output of each frequency conversion side thyristor power cell is connected each other;
Said filter has three inputs, three outputs, and its three inputs connect first output of three frequency conversion side thyristor power cells respectively;
Said step-up transformer has a former limit winding, a secondary winding, and its former limit winding connects three outputs of filter respectively, and its secondary winding connects the armature winding of synchronous machine successively through a motor side vacuum switch, a motor side instrument transformer.
Further, said excitation side thyristor power cell is the three-phase thyristor rectifier bridge.
Further, the former limit winding of said step-down transformer adopts the Y type to connect, and an one of which secondary winding adopts a Y type to connect, and another secondary winding adopts the connection of △ type, 30 ° of the phase phasic differences between two secondary windings.
Further, said frequency conversion side thyristor power cell comprises that rectification module, dc capacitor module, buffering absorb module and inversion module;
Said rectification module is made up of two groups of three-phase thyristor rectifier bridges, and the input of two groups of three-phase thyristor rectifier bridges is received two secondary windings of this pairing step-down transformer in unit respectively;
Said buffering absorbs module and is made up of a buffer inductance, a buffer resistance, a buffering diode, a buffer capacitor; The two ends of said buffer inductance and buffer capacitor are first link, second link respectively; First link of said buffer inductance and buffer capacitor constitutes two inputs that buffering absorbs module respectively; Second link of buffer inductance and buffer capacitor constitutes two outputs that buffering absorbs module respectively; First link of said buffer inductance is received second link of buffer capacitor through buffer resistance, and its second link is received second link of buffer capacitor through buffering diode;
Said dc capacitor module is made up of two high frequency capacitances, and an end of two high frequency capacitances is received the output of two groups of three-phase thyristor rectifier bridges in the rectification module respectively, and the other end of two high frequency capacitances is received two inputs that buffering absorbs module respectively;
Said inversion module is made up of two integral gate change transistor (PCC) powers; Each integral gate change transistor (PCC) power constitutes diode mid point clamper three level structures by integral gate change transistor; The integral gate change transistor mid point output of two integral gate change transistor (PCC) powers constitutes two outputs of frequency conversion side thyristor power cell respectively, and the input of two integral gate change transistor (PCC) powers is received two outputs that buffering absorbs module respectively.
Further, said filter is the LC filter.
Further, the voltage of said power supply network PG is 18kV.
Starting high-power pumped storage unit system based on integral gate change transistor provided by the invention; Utilize static frequency-conversion device output constant torque to make synchronous machine quicken operation; Because the static frequency-conversion device has adopted the frequency conversion side thyristor power cell with self-switching-off capability, so needn't adopt traditional forced commutation mode at the synchronous motor startup initial stage, has improved the success rate of unit starting and the stability of system greatly; Compare with traditional controllable silicon variable frequency starting system; Have that system configuration is succinct, control is accurate, easy to maintenance, harmonic content is little, reactive power impact is little, efficient is high, the characteristics that torque factor is good, and non-moment fluctuates and velocity perturbation; The synchronous motor startup process is steady, has improved the success rate that is incorporated into the power networks of unit.
Description of drawings
Fig. 1 is the structural representation based on the starting high-power pumped storage unit system of integral gate change transistor of the embodiment of the invention;
Fig. 2 is the circuit diagram based on the absorption of the buffering in the starting high-power pumped storage unit system of integral gate change transistor module of the embodiment of the invention.
Embodiment
Below in conjunction with description of drawings embodiments of the invention are described in further detail, but present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.
As shown in Figure 1; A kind of starting high-power pumped storage unit system that the embodiment of the invention provided based on integral gate change transistor; Comprise power supply network PG, synchronous machine G, it is characterized in that: also comprise static frequency-conversion device SFC, excitation unit EX and the switch QF6 that is incorporated into the power networks;
The armature winding of said synchronous machine G connects power supply network PG through the switch QF6 that is incorporated into the power networks;
Said excitation unit EX comprises excitation side transformer TR5 and excitation side thyristor power cell B4; Said excitation side transformer TR5 has a former limit winding, a secondary winding; Its former limit winding is received power supply network PG through an excitation side vacuum switch QF5, an excitation side instrument transformer TVA5 successively, and its secondary winding is received the excitation winding of synchronous machine G through excitation side thyristor power cell B4;
Said static frequency-conversion device SFC comprises a filter FIL, step-up transformer TR4, three frequency conversion side thyristor power cell B1, B2, B3 and three step-down transformer TR1, TR2, TR3; Said three step-down transformers are respectively the first step-down transformer TR1, the second step-down transformer TR2, the 3rd step-down transformer TR3; Said three frequency conversion side thyristor power cells are respectively the first frequency conversion side thyristor power cell B1, the second frequency conversion side thyristor power cell B2, the 3rd frequency conversion side thyristor power cell B3, and three frequency conversion side thyristor power cells are corresponding one by one with three step-down transformers;
Said step-down transformer has a former limit winding, two secondary windings; Each receives power supply network PG respectively through a grid side vacuum switch, a grid side instrument transformer successively the former limit winding of three step-down transformers; Wherein the former limit winding of the first step-down transformer TR1 is received power supply network PG through grid side vacuum switch QF1, grid side instrument transformer TVA1; The former limit winding of the second step-down transformer TR2 is received power supply network PG through grid side vacuum switch QF2, grid side instrument transformer TVA2, and the former limit winding of the 3rd step-down transformer TR3 is received power supply network PG through grid side vacuum switch QF3, grid side instrument transformer TVA3;
Said frequency conversion side thyristor power cell has an input, a feeder ear, two outputs; Its two outputs are respectively first output, second output; The input of each frequency conversion side thyristor power cell and feeder ear are received two secondary windings of corresponding step-down transformer respectively; The input of the first frequency conversion side thyristor power cell B1 and feeder ear two secondary windings receiving corresponding step-down transformer TR1 respectively wherein; Two secondary windings that the input of the second frequency conversion side thyristor power cell B2 and feeder ear are received corresponding step-down transformer TR2 respectively, two secondary windings that the input of the 3rd frequency conversion side thyristor power cell B3 and feeder ear are received corresponding step-down transformer TR3 respectively; Second output of each frequency conversion side thyristor power cell is connected each other;
Said filter FIL has three inputs, three outputs, and its three inputs connect first output of three frequency conversion side thyristor power cell B1, B2, B3 respectively;
Said step-up transformer TR4 has a former limit winding, a secondary winding; Its former limit winding connects three outputs of filter FIL respectively, and its secondary winding connects the armature winding of synchronous machine successively through a motor side vacuum switch QF4, a motor side instrument transformer TVA4.
In the embodiment of the invention, said excitation side transformer TR5, step-up transformer TR4 and three step-down transformer TR1, TR2, TR3 are to exchange and become the friendship alternation depressor that exchanges.
In the embodiment of the invention, said excitation side thyristor power cell B4 is a prior art, is specially the three-phase thyristor rectifier bridge, is used for alternating current is transformed to direct current.
In the embodiment of the invention; The former limit winding of said step-down transformer adopts the Y type to connect, and an one of which secondary winding adopts the Y type to connect, and another secondary winding adopts the △ type to connect; 30 ° of phase phasic differences between two secondary windings can reduce grid side input current harmonics content.
In the embodiment of the invention, said frequency conversion side thyristor power cell comprises that rectification module, dc capacitor module, buffering absorb module and inversion module;
Said rectification module is a prior art, is made up of two groups of three-phase thyristor rectifier bridges, and the input of two groups of three-phase thyristor rectifier bridges is received two secondary windings of this pairing step-down transformer in unit respectively;
As shown in Figure 2; It is prior art that said buffering absorbs module; Form by a buffer inductance L, a buffer resistance R, a buffering diode D, a buffer capacitor C; Be used to avoid integral gate change transistor to flow through big electric current and high voltage occurs, or occur voltage, current peak simultaneously for staggering, the two ends of said buffer inductance L and buffer capacitor C are first link, second link respectively; First link of said buffer inductance L and buffer capacitor C constitutes two inputs that buffering absorbs module respectively; Second link of buffer inductance L and buffer capacitor C constitutes two outputs that buffering absorbs module respectively, and first link of said buffer inductance L is received second link of buffer capacitor C through buffer resistance R, and its second link is received second link of buffer capacitor C through buffering diode D;
Said dc capacitor module is made up of two high frequency capacitances; It is the electric capacity of B25856 that two high frequency capacitances all adopt the model of EPCOS company production; The direct voltage of each high frequency capacitance can reach 2500V; One end of two high frequency capacitances is received the output of two groups of three-phase thyristor rectifier bridges in the rectification module respectively, and the other end of two high frequency capacitances is received two inputs that buffering absorbs module respectively;
Said inversion module is a prior art; Form by two integral gate change transistors (IGCT) (PCC) power; Each integral gate change transistor (PCC) power constitutes diode mid point clamper three level structures by integral gate change transistor (IGCT); Being used for the direct voltage inversion is required alternating voltage; The integral gate change transistor of two integral gate change transistor (PCC) powers (IGCT) mid point output constitutes two outputs of frequency conversion side thyristor power cell respectively; The specification of said integral gate change transistor (IGCT) is 4500V/4000A, and two integral gate change transistors (IGCT) (PCC) power connects back output effective value can reach 3300V, and the input of two integral gate change transistor (PCC) powers is received two outputs that buffering absorbs module respectively.
In the embodiment of the invention, said filter FIL is a prior art, by the LC filter that electric capacity and inductance are formed, is used for frequency conversion side thyristor power cell output carrying out filtering.
In the embodiment of the invention, the voltage of said power supply network PG is 18kV.
Adopt system of the present invention following in high-power pumped storage unit pump operating condition start-up course:
During electric motor starting; Excitation unit EX produces excitatory, makes the inner rotor field that produces of synchronous machine, after the stable foundation in rotor field; Static frequency-conversion device SFC provides electric current to form armature field to the stator side of synchronous machine; In order to overcome in the bigger moment of inertia of initial start stage synchronous machine, static frequency-conversion device SFC calculates rotor-position according to the synchronous machine induced potential then and realizes following the tracks of startup to the direct current of the very low approximate square wave of synchronous machine incoming frequency; Its account form is a prior art, carries out integral operation through detection synchronous machine induced potential and calculates the rotor space position;
During synchronous motor startup; Static frequency-conversion device SFC makes it quicken operation through vector control technology output constant torque, and this vector control technology is a prior art, is specially space vector modulation technique (SVPWM); Because static frequency-conversion device SFC has adopted integral gate change transistor (IGCT) device with self-switching-off capability; So needn't adopt traditional forced commutation mode at the synchronous motor startup initial stage, improve the success rate of unit starting and the stability of system greatly, in the synchronous machine accelerator; Through accelerating the switch motion of integral gate change transistor (IGCT); Change pulse distance, static frequency-conversion device SFC output voltage amplitude and frequency are improved constantly, quicken operation thereby drive synchronous machine.
In the embodiment of the invention, all be built-in with the Profibus communication board among said static frequency-conversion device SFC and the excitation unit EX, can be connected to outside centralized control system through the Profibus communication board; After static frequency-conversion device SFC and excitation unit EX be connected to outside centralized control system, when the synchronous machine rotating speed accelerate to rated speed 99% the time, static frequency-conversion device SFC sends the operating instruction same period through the Profibus communication board to outside centralized control system; Centralized control system begins to carry out the adjustment same period after receiving instruction; And constantly send regulating command to static frequency-conversion device SFC and excitation unit EX, make that respectively amplitude, phase angle and the frequency of synchronous machine terminal voltage and power supply network PG voltage are synchronous, after judging that synchronous condition is confirmed; Outside centralized control system sends " same period, completion can be incorporated into the power networks " instruction again; The switch QF6 action of being incorporated into the power networks is accomplished be incorporated into the power networks, and after the success of being incorporated into the power networks, send to static frequency-conversion device SFC and be incorporated into the power networks into function signal, static frequency-conversion device SFC receives and is incorporated into the power networks into function signal; It is out of service to carry out self-locking; Thereby completion whole starting process, and break off being connected of static frequency-conversion device SFC and synchronous machine through motor side vacuum switch QF4 operation is incorporated into the power networks and static frequency-conversion device SFC does not withdraw from moment at synchronous machine; Static frequency-conversion device SFC carries out self-protection through adjusting, prevents to receive the impact of reverse current.
Claims (6)
1. the starting high-power pumped storage unit system based on integral gate change transistor comprises power supply network, synchronous machine, it is characterized in that: also comprise static frequency-conversion device, excitation unit and the switch that is incorporated into the power networks;
The armature winding of said synchronous machine connects power supply network through the switch that is incorporated into the power networks;
Said excitation unit comprises excitation side transformer and excitation side thyristor power cell; Said excitation side transformer a former limit winding, a secondary winding arranged; Its former limit winding is received power supply network through an excitation side vacuum switch, an excitation side instrument transformer successively, and its secondary winding is received the excitation winding of synchronous machine through excitation side thyristor power cell;
Said static frequency-conversion device comprises a filter, a step-up transformer, three frequency conversion side thyristor power cells and three step-down transformers, and said three frequency conversion side thyristor power cells are corresponding one by one with three step-down transformers;
Said step-down transformer has a former limit winding, two secondary windings; Each receives power supply network respectively through a grid side vacuum switch, a grid side instrument transformer successively the former limit winding of three step-down transformers;
Said frequency conversion side thyristor power cell has an input, a feeder ear, two outputs; Its two outputs are respectively first output, second output; The input of each frequency conversion side thyristor power cell and feeder ear are received two secondary windings of corresponding step-down transformer respectively, and second output of each frequency conversion side thyristor power cell is connected each other;
Said filter has three inputs, three outputs, and its three inputs connect first output of three frequency conversion side thyristor power cells respectively;
Said step-up transformer has a former limit winding, a secondary winding, and its former limit winding connects three outputs of filter respectively, and its secondary winding connects the armature winding of synchronous machine successively through a motor side vacuum switch, a motor side instrument transformer.
2. system according to claim 1 is characterized in that: said excitation side thyristor power cell is the three-phase thyristor rectifier bridge.
3. system according to claim 1 is characterized in that: the former limit winding of said step-down transformer adopts the Y type to connect, and an one of which secondary winding adopts a Y type to connect, and another secondary winding adopts the connection of △ type, 30 ° of the phase phasic differences between two secondary windings.
4. system according to claim 1 is characterized in that: said frequency conversion side thyristor power cell comprises that rectification module, dc capacitor module, buffering absorb module and inversion module;
Said rectification module is made up of two groups of three-phase thyristor rectifier bridges, and the input of two groups of three-phase thyristor rectifier bridges is received two secondary windings of this pairing step-down transformer in unit respectively;
Said buffering absorbs module and is made up of a buffer inductance, a buffer resistance, a buffering diode, a buffer capacitor; The two ends of said buffer inductance and buffer capacitor are first link, second link respectively; First link of said buffer inductance and buffer capacitor constitutes two inputs that buffering absorbs module respectively; Second link of buffer inductance and buffer capacitor constitutes two outputs that buffering absorbs module respectively; First link of said buffer inductance is received second link of buffer capacitor through buffer resistance, and its second link is received second link of buffer capacitor through buffering diode;
Said dc capacitor module is made up of two high frequency capacitances, and an end of two high frequency capacitances is received the output of two groups of three-phase thyristor rectifier bridges in the rectification module respectively, and the other end of two high frequency capacitances is received two inputs that buffering absorbs module respectively;
Said inversion module is made up of two integral gate change transistor (PCC) powers; Each integral gate change transistor (PCC) power constitutes diode mid point clamper three level structures by integral gate change transistor; The integral gate change transistor mid point output of two integral gate change transistor (PCC) powers constitutes two outputs of frequency conversion side thyristor power cell respectively, and the input of two integral gate change transistor (PCC) powers is received two outputs that buffering absorbs module respectively.
5. system according to claim 1 is characterized in that: said filter is the LC filter.
6. system according to claim 1 is characterized in that: the voltage of said power supply network PG is 18kV.
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| CN104124687A (en) * | 2014-08-08 | 2014-10-29 | 南京南瑞继保电气有限公司 | Double-SFC (Static Frequency Converter) system topography structure |
| WO2015085587A1 (en) * | 2013-12-13 | 2015-06-18 | 国家电网公司 | Pumped power regulation system based on insulated grate bipolar transistor (igbt control) and method thereof |
| CN106385163A (en) * | 2015-07-21 | 2017-02-08 | 特变电工新疆新能源股份有限公司 | Phase power unit based on asymmetric IGCT and H bridge chain link structure |
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| CN104124687A (en) * | 2014-08-08 | 2014-10-29 | 南京南瑞继保电气有限公司 | Double-SFC (Static Frequency Converter) system topography structure |
| CN106385163A (en) * | 2015-07-21 | 2017-02-08 | 特变电工新疆新能源股份有限公司 | Phase power unit based on asymmetric IGCT and H bridge chain link structure |
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| Publication number | Publication date |
|---|---|
| CN102315810B (en) | 2014-01-15 |
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