CN102315810B - Integrated gate commutated thyristor based high-power pumped storage unit starting system - Google Patents
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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 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 by the demand of hydroenergy storage station for peak regulation.Hydroenergy storage station can be used as generator operation at electrical network during in peak load, to electrical network, provides electric energy; When electrical network load at a low ebb, as motor, move, drive water pump, the water of lower reservoir is drawn back to upper pond, convert electric energy to potential energy standby to do.Hydroenergy storage station can be brought into play the multi-functionals such as peak-clipping and valley-filling, frequency modulation, phase modulation, emergency duty and black starting, can effectively reduce the number of times that fired power generating unit participates in 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 mains supply reliability.Therefore, hydroenergy storage station is rationally effectively utilized, and can reduce conventional thermoelectricity peaking power source and build and fired power generating unit exhaust emission gas, significant to improving service conditions and the protection of the environment of electric power system.
The startup of high-power pumped storage unit (more than single-machine capacity 300MW) under pump operating condition is the problem that must consider.In the prior art, what the startup of most of pumped storage unit pump operating condition adopted with SFC (static frequency-conversion device) is traditional silicon controlled thyristor frequency conversion device, characteristic and circuit topology defect due to silicon-controlled device, there is the shortcomings such as complex structure, loss is large, start-up time is slow, harmonic content is high, reactive power impact is large in it, will have a negative impact to electrical network and motor.
Summary of the invention
For the defect existing in above-mentioned prior art, technical problem to be solved by this invention be to provide a kind of system configuration succinct, control accurate, easy to maintenance, harmonic content is little, reactive power impact is little, efficiency 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 based on integral gate change transistor provided by the present invention, comprise power supply network, synchronous machine, it is characterized in that: also comprise static frequency-conversion device, excitation unit and grid-connected switch;
The armature winding of described synchronous machine connects power supply network through grid-connected switch;
Described excitation unit comprises excitation side transformer and excitation side thyristor power unit, the You Yigeyuan limit winding of described excitation side transformer, a secondary winding, Qi Yuan 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 unit;
Described static frequency-conversion device comprises a filter, a step-up transformer, three frequency conversion side thyristor power units and three step-down transformers, and described three frequency conversion side thyristor power units are corresponding one by one with three step-down transformers;
Described step-down transformer You Yigeyuan limit winding, two secondary windings; Each receives respectively power supply network through a grid side vacuum switch, a grid side instrument transformer successively the former limit winding of three step-down transformers;
Described frequency conversion side thyristor power unit has an input, a feeder ear, two outputs, two output is respectively the first output, the second output, the input of each frequency conversion side thyristor power unit and feeder ear are received two secondary windings of corresponding step-down transformer respectively, and the second output of each frequency conversion side thyristor power unit is connected mutually;
Described filter has three inputs, three outputs, and its three inputs connect respectively the first output of three frequency conversion side thyristor power units;
Described step-up transformer You Yigeyuan limit winding, a secondary winding ，Qi Yuan limit winding connect respectively three outputs of filter, and its secondary winding connects the armature winding of synchronous machine successively through a motor side vacuum switch, a motor side instrument transformer.
Further, described excitation side thyristor power unit is three-phase thyristor rectifier bridge.
Further, the former limit winding of described step-down transformer adopts Y type to connect, and an one secondary winding adopts Y type to connect, and another secondary winding adopts △ type to connect, 30 ° of the phase phasic differences between two secondary windings.
Further, described frequency conversion side thyristor power unit comprises rectification module, DC capacitor module, snubber module and inversion module;
Described rectification module is comprised of two groups of three-phase thyristor rectifier bridges, and the input of two groups of three-phase thyristor rectifier bridges is received respectively two secondary windings of this corresponding step-down transformer in unit;
Described snubber module is by a buffer inductance, one buffer resistance, one buffering diode, one buffer capacitor forms, the two ends of described buffer inductance and buffer capacitor are the first link respectively, the second link, the first link of described buffer inductance and buffer capacitor forms respectively two inputs of snubber module, the second link of buffer inductance and buffer capacitor forms respectively two outputs of snubber module, the first link of described buffer inductance is received the second link of buffer capacitor through buffer resistance, its second link is received the second link of buffer capacitor through buffering diode,
Described DC capacitor module is comprised of two high frequency capacitances, and the output of two groups of three-phase thyristor rectifier bridges in rectification module is received respectively in one end of two high frequency capacitances, and the other end of two high frequency capacitances is received respectively two inputs of snubber module;
Described inversion module is comprised of two integral gate change transistor (PCC) powers, each integral gate change transistor (PCC) power forms diode neutral-point-clamped three level structures by integral gate change transistor, the integral gate change transistor mid point output of two integral gate change transistor (PCC) powers forms respectively two outputs of frequency conversion side thyristor power unit, and the input of two integral gate change transistor (PCC) powers is received respectively two outputs of snubber module.
Further, described filter is LC filter.
Further, the voltage of described 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 Accelerating running, because static frequency-conversion device has adopted the frequency conversion side thyristor power unit with self-switching-off capability, therefore needn't adopt traditional forced commutation mode at the synchronous motor startup initial stage, the success rate of unit starting and the stability of system have greatly been improved, compare with traditional controllable silicon variable frequency starting system, there is system configuration succinct, control accurately, easy to maintenance, harmonic content is little, reactive power impact is little, efficiency is high, the feature that torque factor is good, and non-moment fluctuation and velocity perturbation, synchronous motor startup process is steady, improved the grid-connected success rate of unit.
Accompanying drawing explanation
Fig. 1 is the structural representation of the starting high-power pumped storage unit system based on integral gate change transistor of the embodiment of the present invention;
Fig. 2 is the circuit diagram of the snubber module in the starting high-power pumped storage unit system based on integral gate change transistor of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing explanation, embodiments of the invention are described in further detail, but the present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof, all should list protection scope of the present invention in.
As shown in Figure 1, a kind of starting high-power pumped storage unit system based on integral gate change transistor that the embodiment of the present invention provides, comprise power supply network PG, synchronous machine G, it is characterized in that: also comprise static frequency-conversion device SFC, excitation unit EX and grid-connected switch QF6;
The armature winding of described synchronous machine G connects power supply network PG through grid-connected switch QF6;
Described excitation unit EX comprises excitation side transformer TR5 and excitation side thyristor power unit B4, the You Yigeyuan limit winding of described excitation side transformer TR5, a secondary winding, Qi Yuan 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 unit B4;
Described static frequency-conversion device SFC comprises a filter FIL, a step-up transformer TR4, three frequency conversion side thyristor power unit B1, B2, B3 and three step-down transformer TR1, TR2, TR3, described three step-down transformers are respectively the first step-down transformer TR1, the second step-down transformer TR2, the 3rd step-down transformer TR3, described three frequency conversion side thyristor power units are respectively the first frequency conversion side thyristor power unit B1, the second frequency conversion side thyristor power unit B2, the 3rd frequency conversion side thyristor power unit B3, three frequency conversion side thyristor power units are corresponding one by one with three step-down transformers,
Described step-down transformer You Yigeyuan limit winding, two secondary windings; Each receives respectively power supply network PG through a grid side vacuum switch, a grid side instrument transformer successively the former limit winding of three step-down transformers, wherein the first step-down transformer TR1Yuan limit winding is received power supply network PG through grid side vacuum switch QF1, grid side instrument transformer TVA1, the second step-down transformer TR2Yuan limit winding is received power supply network PG through grid side vacuum switch QF2, grid side instrument transformer TVA2, and the 3rd step-down transformer TR3Yuan limit winding is received power supply network PG through grid side vacuum switch QF3, grid side instrument transformer TVA3;
Described frequency conversion side thyristor power unit has an input, a feeder ear, two outputs, two output is respectively the first output, the second output, the input of each frequency conversion side thyristor power unit and feeder ear are received two secondary windings of corresponding step-down transformer respectively, wherein the input of the first frequency conversion side thyristor power unit B1 and feeder ear are received respectively two secondary windings of corresponding step-down transformer TR1, the input of the second frequency conversion side thyristor power unit B2 and feeder ear are received respectively two secondary windings of corresponding step-down transformer TR2, the input of the 3rd frequency conversion side thyristor power unit B3 and feeder ear are received respectively two secondary windings of corresponding step-down transformer TR3, the second output of each frequency conversion side thyristor power unit is connected mutually,
Described filter FIL has three inputs, three outputs, and its three inputs connect respectively the first output of three frequency conversion side thyristor power unit B1, B2, B3;
Described step-up transformer TR4 You Yigeyuan limit winding, a secondary winding, Qi Yuan limit winding connects respectively three outputs of filter FIL, 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 present invention, described 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 exchanging.
In the embodiment of the present invention, described excitation side thyristor power unit B4 is prior art, is specially three-phase thyristor rectifier bridge, for alternating current is transformed to direct current.
In the embodiment of the present invention, the former limit winding of described step-down transformer adopts Y type to connect, and an one secondary winding adopts Y type to connect, and another secondary winding adopts △ type to connect, 30 ° of phase phasic differences between two secondary windings, can reduce the harmonic content of grid side input current.
In the embodiment of the present invention, described frequency conversion side thyristor power unit comprises rectification module, DC capacitor module, snubber module and inversion module;
Described rectification module is prior art, two groups of three-phase thyristor rectifier bridges, consists of, and the input of two groups of three-phase thyristor rectifier bridges is received respectively two secondary windings of this corresponding step-down transformer in unit;
As shown in Figure 2, described snubber module is prior art, by a buffer inductance L, one buffer resistance R, one buffering diode D, one buffer capacitor C forms, be used for avoiding integral gate change transistor stream super-high-current and occur high voltage, or there is voltage for staggering simultaneously, current peak, the two ends of described buffer inductance L and buffer capacitor C are the first link respectively, the second link, the first link of described buffer inductance L and buffer capacitor C forms respectively two inputs of snubber module, the second link of buffer inductance L and buffer capacitor C forms respectively two outputs of snubber module, the first link of described buffer inductance L is received the second link of buffer capacitor C through buffer resistance R, its second link is received the second link of buffer capacitor C through buffering diode D,
Described DC capacitor module is comprised of two high frequency capacitances, two high frequency capacitances all adopt the electric capacity that the model of EPCOS company production is B25856, the direct voltage of each high frequency capacitance can reach 2500V, the output of two groups of three-phase thyristor rectifier bridges in rectification module is received respectively in one end of two high frequency capacitances, and the other end of two high frequency capacitances is received respectively two inputs of snubber module;
Described inversion module is prior art, by two integral gate change transistors (IGCT) (PCC) power, formed, each integral gate change transistor (PCC) power forms diode neutral-point-clamped three level structures by integral gate change transistor (IGCT), being used for is required alternating voltage by direct voltage inversion, the integral gate change transistor of two integral gate change transistor (PCC) powers (IGCT) mid point output forms respectively two outputs of frequency conversion side thyristor power unit, the specification of described integral gate change transistor (IGCT) is 4500V/4000A, after two integral gate change transistors (IGCT) (PCC) power connects, output effective value can reach 3300V, the input of two integral gate change transistor (PCC) powers is received respectively two outputs of snubber module.
In the embodiment of the present invention, described filter FIL is prior art, and the LC filter being comprised of electric capacity and inductance, for exporting and carry out filtering frequency conversion side thyristor power unit.
In the embodiment of the present invention, the voltage of described power supply network PG is 18kV.
Adopt system of the present invention as follows in high-power pumped storage unit pump operating condition start-up course:
During electric motor starting, excitation unit EX produces excitatory, make the inner rotor field that produces of synchronous machine, after the Establishment of Stable of 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 larger moment of inertia of initial start stage synchronous machine, static frequency-conversion device SFC is to the direct current of the very low approximate square wave of synchronous machine incoming frequency, then according to synchronous machine induced potential, calculate rotor-position and realize tracking startup, its account form is prior art, by detection synchronous machine induced potential, carry out integral operation and calculate rotor space position,
During synchronous motor startup, static frequency-conversion device SFC exports constant torque by vector control technology and makes its Accelerating running, this vector control technology is prior art, be 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, therefore needn't adopt traditional forced commutation mode at the synchronous motor startup initial stage, the success rate of unit starting and the stability of system have greatly been improved, in synchronous machine accelerator, by accelerating the switch motion of integral gate change transistor (IGCT), change pulse distance, amplitude and the frequency of static frequency-conversion device SFC output voltage are improved constantly, thereby drive synchronous machine Accelerating running.
In the embodiment of the present invention, in described static frequency-conversion device SFC and excitation unit EX, be all built-in with Profibus communication board, by Profibus communication board, can be connected to outside centralized control system, static frequency-conversion device SFC and excitation unit EX are connected to after outside centralized control system, when synchronous machine rotating speed accelerate to rated speed 99% time, static frequency-conversion device SFC sends the operating instruction same period by Profibus communication board to outside centralized control system, centralized control system starts to carry out simultaneity control after receiving instruction, and constantly send regulating command to static frequency-conversion device SFC and excitation unit EX, make respectively the amplitude of synchronous machine terminal voltage, phase angle and frequency are synchronizeed with power supply network PG voltage, after judging that synchronous condition is determined, outside centralized control system sends " simultaneous completion can be grid-connected " instruction again, make grid-connected switch QF6 move grid-connected, and to static frequency-conversion device SFC, send grid-connected one-tenth function signal after grid-connected success, static frequency-conversion device SFC receives grid-connected one-tenth function signal, carry out self-locking out of service, thereby complete whole start-up course, and disconnect being connected of static frequency-conversion device SFC and synchronous machine by motor side vacuum switch QF4 operation, at synchronous machine, grid-connected and static frequency-conversion device SFC does not exit moment, static frequency-conversion device SFC carries out self-protection by adjusting, prevent from being subject to the impact of reverse current.
Claims (4)
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 grid-connected switch;
The armature winding of described synchronous machine connects power supply network through grid-connected switch;
Described excitation unit comprises excitation side transformer and excitation side thyristor power unit, described excitation side transformer You Yigeyuan limit winding, a secondary winding, Qi Yuan 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 unit;
Described static frequency-conversion device comprises a filter, a step-up transformer, three frequency conversion side thyristor power units and three step-down transformers, and described three frequency conversion side thyristor power units are corresponding one by one with three step-down transformers;
Described step-down transformer You Yigeyuan limit winding, two secondary windings; Each receives respectively power supply network through a grid side vacuum switch, a grid side instrument transformer successively the former limit winding of three step-down transformers;
Described frequency conversion side thyristor power unit has an input, a feeder ear, two outputs, two output is respectively the first output, the second output, the input of each frequency conversion side thyristor power unit and feeder ear are received two secondary windings of corresponding step-down transformer respectively, and the second output of each frequency conversion side thyristor power unit is connected mutually;
Described filter has three inputs, three outputs, and its three inputs connect respectively the first output of three frequency conversion side thyristor power units;
Described step-up transformer You Yigeyuan limit winding, a secondary winding ，Qi Yuan limit winding connect respectively three outputs of filter, and its secondary winding connects the armature winding of synchronous machine successively through a motor side vacuum switch, a motor side instrument transformer;
The former limit winding of described step-down transformer adopts Y type to connect, and an one secondary winding adopts Y type to connect, and another secondary winding adopts △ type to connect, 30 ° of the phase phasic differences between two secondary windings;
Described frequency conversion side thyristor power unit comprises rectification module, DC capacitor module, snubber module and inversion module;
Described rectification module is comprised of two groups of three-phase thyristor rectifier bridges, and the input of two groups of three-phase thyristor rectifier bridges is received respectively two secondary windings of this corresponding step-down transformer in unit;
Described snubber module is by a buffer inductance, one buffer resistance, one buffering diode, one buffer capacitor forms, the two ends of described buffer inductance and buffer capacitor are the first link respectively, the second link, the first link of described buffer inductance and buffer capacitor forms respectively two inputs of snubber module, the second link of buffer inductance and buffer capacitor forms respectively two outputs of snubber module, the first link of described buffer inductance is received the second link of buffer capacitor through buffer resistance, its second link is received the second link of buffer capacitor through buffering diode,
Described DC capacitor module is comprised of two high frequency capacitances, and the output of two groups of three-phase thyristor rectifier bridges in rectification module is received respectively in one end of two high frequency capacitances, and the other end of two high frequency capacitances is received respectively two inputs of snubber module;
Described inversion module is comprised of two integral gate change transistor (PCC) powers, each integral gate change transistor (PCC) power forms diode neutral-point-clamped three level structures by integral gate change transistor, the integral gate change transistor mid point output of two integral gate change transistor (PCC) powers forms respectively two outputs of frequency conversion side thyristor power unit, and the input of two integral gate change transistor (PCC) powers is received respectively two outputs of snubber module.
2. system according to claim 1, is characterized in that: described excitation side thyristor power unit is three-phase thyristor rectifier bridge.
3. system according to claim 1, is characterized in that: described filter is LC filter.
4. system according to claim 1, is characterized in that: the voltage of described power supply network is 18kV.
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| CN103401408B (en) * | 2013-07-03 | 2015-05-27 | 西安交通大学 | Direct current side circuit of IGCT (integrated gate commutated thyristor) converter/test circuit and method for designing parameters of clamp capacitor and clamp resistor of direct current side circuit |
| 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 |
| 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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