CN104377737A - Topological structure of DWIG alternating-current and direct-current power generation system used for microgrid and control method - Google Patents
Topological structure of DWIG alternating-current and direct-current power generation system used for microgrid and control method Download PDFInfo
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Abstract
The invention discloses a topological structure of a DWIG alternating-current and direct-current power generation system used for a microgrid and a control method, and belongs to the technical field of alternating-current and direct-current mixed microgrids. The topological structure of the system comprises a main circuit, a detecting circuit and a control circuit. The main circuit comprises a stator duplex winding asynchronous motor, a filter inductor, an alternating-current- alternating-current convertor, a three-phase rectifier bridge, a first breaker, a second breaker, a third breaker, a fourth breaker and a fifth breaker. The detecting circuit comprises a first alternating-current voltage sensor, a first direct-current voltage sensor, a second direct-current voltage sensor, a second alternating-current voltage sensor, a third alternating-current voltage sensor, a first alternating-current current sensor, a direct-current current sensor, a second alternating-current current sensor and an air velocity sensor. The control circuit comprises a digital signal processor and a drive circuit. By means of the grid connection method, one power generator generates alternating currents and direct currents at the same time, and transmission of alternating-current electric energy to the direct-current side and alternating-current and direct-current grid connection in a wide air velocity range in a zero-wind area are achieved.
Description
Technical field
The invention discloses microgrid DWIG(Dual Stator-Winding Induction Generator, dual stator-winding induction generator) topological structure of alternating current-direct current electricity generation system and control method, to generate electricity by way of merging two or more grid systems method in particular for direct current in the asynchronous motor power generation system of stator duplex winding of microgrid alternating current-direct current mixed power generation and wide wind speed range, belong to the technical field of alternating current-direct current mixing microgrid.
Background technology
The environmental problem that the shortage of current energy source and traditional energy bring facilitates extensive access and the utilization of clean energy resource, improve efficiency of energy utilization, implement the great scientific and technological industrialization engineering of intelligent grid, adjustment China energy resource structure, energy-saving and emission-reduction, reply climate change are significant.The process of intelligent grid is built in comprehensive regions of the world, and the focus of attention of intelligent grid includes microgrid, and microgrid is the access utilizing extensive clean energy resource.The kind of current regenerative resource has many examples as wind energy, tidal energy, water energy etc.Due to the unsteadiness of clean energy resource, need various energy resources to fully utilize, and be equipped with energy type energy storage and power-type energy storage device to realize the complementary object optimized.In structure microgrid, current most electricity generation system exports electric energy mode and only has single alternating current or direct current.The generating so how adopting simple mode to realize wide fast scope maximal efficiency is the problem needing to consider.In alternating current-direct current mixing microgrid, often need an alternating current machine, a direct current machine forms separate alternating current power-generating system and DC power generation system, when needing energy in bidirectional flow between AC network and direct current network, a biphase rectification inverter is needed between AC network and direct current network, there is the defect needing extra commutation inversion device, the construction cost of this increase system and operation expense also reduce the reliability of system simultaneously.
Dual stator-winding induction generator (DWIG) is the novel squirrel cage induction motor of one that earlier 2000s is proposed by Tennessee Polytechnics of U.S. professor Ojo, the rotor of this motor is still cagelike structure, inherit the intrinsic advantage of traditional squirrel cage induction motor, its stator there is double winding, a set of is controlled winding, is connected to power inverter; Another set of is power winding, powers to the load, and two cover stator winding have identical number of pole-pairs, share same air-gap field, and they do not have direct current to connect on electrically, and by means of only magnetic coupling, function separately, easily realizes high performance control.Because DWIG structure is unique and have plurality of advantages, it has attracted the extensive concern of domestic and international researcher.Professor Ojo has done many pionerring researches to the topological structure of DWIG constant-speed and constant-frequency alternating current power-generating system and control strategy.The big penetrating judgment of horse of domestic naval engineering university is awarded with naval vessel independent electric power supply for application background, conducts in-depth research, mainly comprise topological structure, control strategy, stability etc. to the DWIG high-voltage direct current power generation system under constant-speed operation condition.For widening the application scenario of DWIG, the researcher of Nanjing Aero-Space University is from the DWIG high-voltage direct current power generation system the variable-speed operation condition that begins one's study in 2004, as shown in Figure 1, and emphasis has carried out research work to design of electrical motor, system optimization, control strategy etc.
Summary of the invention
Technical problem to be solved by this invention is the deficiency for above-mentioned background technology, provide topological structure and the control method of microgrid DWIG alternating current-direct current electricity generation system, send out alternating current and direct current and need to build independently alternating current power-generating system and DC power generation system, alternating current-direct current to solve in microgrid and generate electricity by way of merging two or more grid systems and control complicated and input energy and meet not good with grid side energy compatibility, traditional alternating current-direct current and mix micro-grid connection and need extra these technical problems of commutation inversion device.
The present invention adopts following technical scheme for achieving the above object.
The microgrid topological structure of DWIG alternating current-direct current electricity generation system, comprises major loop, measure loop and control loop, described major loop comprises: stator double-winding asynchronous, filter inductance, hand over AC-AC converter, three-phase commutation bridge, first circuit breaker, second circuit breaker, 3rd circuit breaker, 4th circuit breaker, 5th circuit breaker, measure loop comprises: the first AC voltage sensor detecting ac grid voltage, detect the first direct current voltage sensor of direct current network voltage, detect the second direct current voltage sensor of three phase rectifying bridge DC side output voltage, detect the second AC voltage sensor of stator double-winding asynchronous controlled winding output voltage, detect the 3rd AC voltage sensor handing over AC-AC converter to pass to alternating current voltage on line side, detect the first AC current sensor handing over AC-AC converter and filter inductance junction electric current, detect the DC current sensor of three phase rectifying bridge DC side output current, detect the second AC current sensor of stator double-winding asynchronous controlled winding output current, and air velocity transducer, control loop comprises: digital signal processor, drive circuit,
The outlet of stator double-winding asynchronous power winding is connected with the AC of three-phase commutation bridge through the 4th circuit breaker, three phase rectifying bridge DC side is connected with direct current network through the second circuit breaker, stator double-winding asynchronous controlled winding outlet is connected with friendship AC-AC converter side through the first circuit breaker, AC-AC converter opposite side is handed over to be connected with filter inductance one end, the filter inductance other end is connected with AC network with through the 3rd circuit breaker, stator double-winding asynchronous controlled winding outlet, the 5th circuit breaker is connected between the outlet of power winding, first AC voltage sensor is connected on AC network side, first direct current voltage sensor is connected on direct current network side, second direct current voltage sensor is connected on three phase rectifying bridge DC side, second AC voltage sensor, second AC current sensor is all connected on the first breaker outgoing line, 3rd AC voltage sensor is connected on the 3rd circuit breaker inlet wire, first AC current sensor is connected on the junction of handing over AC-AC converter and filter inductance, DC current sensor is connected on three phase rectifying bridge DC side, drive circuit input, first AC voltage sensor output, first direct current voltage sensor output, second direct current voltage sensor output, second AC voltage sensor output, 3rd AC voltage sensor output, first AC current sensor output, DC current sensor output, second AC current sensor output is connected with digital signal processor respectively, drive circuit exports termination and hands over power device control end in AC-AC converter, the controller of each circuit breaker is connected with digital signal processor respectively,
Digital signal processor is according to wind speed, ac grid voltage, direct current network voltage, three phase rectifying bridge DC side output voltage and electric current, stator double-winding asynchronous controlled winding output voltage and electric current, 3rd circuit breaker primary voltage, AC-AC converter and filter inductance junction electric current is handed over to obtain the input signal of drive circuit, hand over AC-AC converter under drive singal effect by the energy transferring of AC network to direct current network or simultaneously by energy transferring to AC network, direct current network, digital signal processor controls the second breaker closing when three phase rectifying bridge DC side output voltage and direct current network voltage synchronous, digital signal processor controls the 3rd breaker closing when the voltage that friendship AC-AC converter passes to AC network side is synchronous with ac grid voltage.
As the further prioritization scheme of the topological structure of described microgrid DWIG alternating current-direct current electricity generation system, AC-AC converter is handed over to comprise the first electric capacity, second electric capacity, 3rd electric capacity, first switch, second switch, 3rd switch, 4th switch, 5th switch, 6th switch, described first electric capacity one pole, first switch one end, 4th switch one end is connected, second electric capacity one pole is connected with another pole of the first electric capacity, second switch one end is connected with the first switch other end, 5th switch one end is connected with the 4th switch other end, 3rd electric capacity one pole is connected with another pole of the second electric capacity, 3rd switch one end is connected with the second switch other end, and the 6th switch one end is connected with the 5th switch other end, the 3rd another pole of electric capacity, the 3rd switch other end, the 6th switch other end is connected, the tie point of the first electric capacity and the second electric capacity, the tie point of the first switch and second switch, the tie point of the 4th switch and the 5th switch forms the side terminal handing over AC-AC converter, the tie point of the second electric capacity and the 3rd electric capacity, the tie point of second switch and the 3rd switch, the tie point of the 5th switch and the 6th switch forms the opposite side terminal handing over AC-AC converter.
The control method of described microgrid DWIG alternating current-direct current electricity generation system, digital signal processor generates the control strategy in each wind speed district according to the signal of telecommunication of the wind speed of air velocity transducer collection and each transducer collection:
Without wind speed district control strategy, DSP CONTROL first breaker open operation, the 4th breaker open operation, the 5th breaker closing, the 3rd breaker closing, hand over AC-AC converter by AC network energy transferring to direct current network;
Low wind speed district control strategy, AC-AC converter is handed over to regulate active power and the reactive power of stator double-winding asynchronous controlled winding, and by handing over AC-AC converter that AC energy is passed to AC network, digital signal processor controls the 3rd breaker closing when the voltage that friendship AC-AC converter passes to AC network side is synchronous with ac grid voltage, and DWIG electricity generation system is incorporated to AC network;
High wind speed district control strategy, AC-AC converter is handed over to regulate active power and the reactive power of stator double-winding asynchronous controlled winding, both from controlled winding, hand over AC-AC converter that the AC energy that the AC energy of variable voltage variable frequency is transformed into constant voltage constant frequency is passed to AC network, again from power winding, AC energy is rectified into direct current energy and passes to direct current network by three-phase commutation bridge, digital signal processor controls the second breaker closing when three phase rectifying bridge DC side output voltage and direct current network voltage synchronous, DWIG electricity generation system is incorporated to direct current network, the 3rd breaker closing is controlled when the voltage that friendship AC-AC converter passes to AC network side is synchronous with ac grid voltage, DWIG electricity generation system is incorporated to AC network, achieve alternating current-direct current simultaneously grid-connected.
As the further prioritization scheme of described control method, in low wind speed district control strategy and high wind speed district control strategy, the coupled relation of stator double-winding asynchronous double winding can also be utilized, by handing over active power and the reactive power of AC-AC converter regulable control winding side.
As the further prioritization scheme of described control method, it is characterized in that in described low wind speed Region control strategy, utilizing voltage pump rise principle, by handing over AC-AC converter, AC energy is passed to AC network.
The present invention adopts technique scheme, has following beneficial effect:
1, be applied in microgrid by DWIG alternating current-direct current electricity generation system, achieve a generator and send out alternating current and direct current simultaneously, improving an alternating current and direct current in microgrid needs to build the defect of independently alternating current power-generating system and DC power generation system;
2, it is grid-connected that the circuit breaker arranged in DWIG alternating current-direct current electricity generation system controls alternating current-direct current under the control of digital signal processor, improves the defect that traditional alternating current-direct current mixing micro-grid connection needs extra commutation inversion device;
3, generate electricity by way of merging two or more grid systems in method in wide wind speed range, without the circuit breaker of wind speed district by being connected between closed power winding, controlled winding, realizing electric energy and being passed to DC side from AC; Low wind speed district, regulates the active power of stator double-winding asynchronous controlled winding and reactive power realization to exchange grid-connected by handing over AC-AC converter; High wind speed district, both from controlled winding, friendship AC-AC converter, the AC energy that the AC energy of variable voltage variable frequency is transformed into constant voltage constant frequency was passed to AC network, AC energy is rectified into direct current energy passes to direct current network from power winding, three-phase commutation bridge again, realize alternating current-direct current simultaneously grid-connected.The alternating current-direct current that whole method achieves in wide wind speed range is grid-connected.When electric energy needed for direct current network is greater than input electric energy, insufficient section is passed to direct current network by AC network, can according to the relation between input power, AC network, direct current network three under different operating modes, reasonable distribution energy;
4, the friendship AC-AC converter that a kind of switching device number is few, switching loss is little is proposed.
Accompanying drawing explanation
Fig. 1 is existing DWIG power generation system structure block diagram.
Fig. 2 is the schematic diagram of DWIG alternating current-direct current electricity generation system.
Fig. 3 is the circuit diagram handing over AC-AC converter.
Number in the figure illustrates: 1, stator double-winding asynchronous, 2, filter inductance, 3, hand over AC-AC converter, 4, first AC current sensor, 5, DC current sensor, 6, second AC current sensor, 7, first AC voltage sensor, 8, first direct current voltage sensor, 9, second direct current voltage sensor, 10, second AC voltage sensor, 11, 3rd AC voltage sensor, 12, digital signal processor, 13, drive circuit, 14, three-phase commutation bridge, 15, first circuit breaker, 16 second circuit breakers, 17, 3rd circuit breaker, 18, AC network, 19, direct current network, 20, 4th circuit breaker, 21, 5th circuit breaker, 22, air velocity transducer, C1, first electric capacity, C2, second electric capacity, C3, 3rd electric capacity, S1, first switch, S2, second switch, S3, 3rd switch, S4, 4th switch, S5, 5th switch, S6, 6th switch.
Embodiment
Be described in detail below in conjunction with the technical scheme of accompanying drawing to invention.
Microgrid with DWIG alternating current-direct current electricity generation system as shown in Figure 2, comprise major loop, measure loop and control loop.Major loop comprises: stator double-winding asynchronous 1, filter inductance 2, hand over AC-AC converter 3, three-phase commutation bridge 14, first circuit breaker 15, second circuit breaker 16, the 3rd circuit breaker 17, the 4th circuit breaker 20, the 5th circuit breaker 21.Measure loop comprises: the first AC voltage sensor 7 detecting AC network 18 voltage, detect the first direct current voltage sensor 8 of direct current network 19 voltage, detect the second direct current voltage sensor 9 of three-phase commutation bridge 14 DC side output voltage, detect the second AC voltage sensor 10 of stator double-winding asynchronous 1 controlled winding output voltage, detect the 3rd AC voltage sensor 11 handing over AC-AC converter 3 to pass to alternating current voltage on line side, detect the first AC current sensor 4 handing over AC-AC converter 3 and filter inductance 2 junction electric current, detect the DC current sensor 5 of three-phase commutation bridge 3 DC side output current, detect the second AC current sensor 6 of stator double-winding asynchronous 1 controlled winding output current, and air velocity transducer 22.Control loop comprises: digital signal processor 12, drive circuit 13.
Hand over AC-AC converter as shown in Figure 3, comprise the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the first switch S 1, second switch S2, the 3rd switch S 3, the 4th switch S 4, the 5th switch S 5, the 6th switch S 6.Switch is wholly-controled device, can realize the two-way flow of energy.First electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 of serial connection form a brachium pontis, first switch S 1 of serial connection, second switch S2, the 3rd switch S 3 form a brachium pontis, 4th switch S 4 of serial connection, the 5th switch S 5, the 6th switch S 6 form a brachium pontis, and three brachium pontis are connected in parallel the friendship AC-AC converter of a composition symmetrical structure.A, B, C tri-tie points draw the AC terminal handing over AC-AC converter, and D, E, F tri-tie points are drawn and handed over another AC terminal of AC-AC converter.This friendship AC-AC converter, compared to traditional friendship AC-AC converter, has derailing switch number of packages few, the advantage that switching loss is little.
The DWIG electricity generation system shown in Fig. 2 is adopted to realize alternating current-direct current in wide wind speed range grid-connected.At zone of silence, realize AC power flow DC side by the closed circuit breaker be connected between motor double winding, which dictates that according to the relation between input power, AC network, direct current network three under different operating modes, reasonable distribution energy; In low wind speed district, the active power of stator double-winding asynchronous controlled winding and reactive power realization is regulated to exchange grid-connected by handing over AC-AC converter; High wind speed district, both from controlled winding, friendship AC-AC converter, the AC energy that the AC energy of variable voltage variable frequency is transformed into constant voltage constant frequency was passed to AC network, AC energy is rectified into direct current energy passes to direct current network from power winding, three-phase commutation bridge again, realize alternating current-direct current simultaneously grid-connected:
Without wind speed district control strategy, digital signal processor 12 controls the first circuit breaker 15 separating brake, the 4th circuit breaker 20 separating brake, the 5th circuit breaker 21 close a floodgate, the 3rd circuit breaker 17 closes a floodgate, and hands over AC-AC converter 3 by AC network energy transferring to direct current network;
Low wind speed district control strategy, AC-AC converter 3 is handed over to regulate active power and the reactive power of stator double-winding asynchronous controlled winding, utilize voltage pump rise principle, by handing over AC-AC converter 3, AC energy is passed to AC network, digital signal processor 12 controls the 3rd circuit breaker 17 when the voltage that friendship AC-AC converter 3 passes to AC network side is synchronous with ac grid voltage and closes a floodgate, and DWIG electricity generation system is incorporated to AC network.
High wind speed district control strategy, AC-AC converter 3 is handed over to regulate active power and the reactive power of stator double-winding asynchronous controlled winding, both from controlled winding, hand over AC-AC converter 3 that the AC energy that the AC energy of variable voltage variable frequency is transformed into constant voltage constant frequency is passed to AC network, again from power winding, AC energy is rectified into direct current energy and passes to direct current network by three-phase commutation bridge 15, digital signal processor 12 controls the second circuit breaker 16 when three-phase commutation bridge 14 DC side output voltage and direct current network voltage synchronous and closes a floodgate, DWIG electricity generation system is incorporated to direct current network, control the 3rd circuit breaker 17 when the voltage that friendship AC-AC converter 3 passes to AC network side is synchronous with ac grid voltage to close a floodgate, DWIG electricity generation system is incorporated to AC network, achieve alternating current-direct current simultaneously grid-connected.
In low wind speed district control strategy and high wind speed district control strategy, the coupled relation of stator double-winding asynchronous double winding can also be utilized, regulate the energy distribution of regulating power winding side and controlled winding side by handing over AC-AC converter 3 and realize AC energy to DC side energy transferring.
Claims (5)
1. the microgrid topological structure of DWIG alternating current-direct current electricity generation system, comprises major loop, measure loop and control loop, is characterized in that, described major loop comprises: stator double-winding asynchronous (1), filter inductance (2), hand over AC-AC converter (3), three-phase commutation bridge (14), first circuit breaker (15), second circuit breaker (16), 3rd circuit breaker (17), 4th circuit breaker (20), 5th circuit breaker (21), measure loop comprises: the first AC voltage sensor (7) detecting ac grid voltage, detect first direct current voltage sensor (8) of direct current network voltage, detect second direct current voltage sensor (9) of three-phase commutation bridge (14) DC side output voltage, detect second AC voltage sensor (10) of stator double-winding asynchronous (1) controlled winding output voltage, detect the 3rd AC voltage sensor (11) handing over AC-AC converter (3) to pass to alternating current voltage on line side, detect the first AC current sensor (4) handing over AC-AC converter (3) and filter inductance (2) junction electric current, detect the DC current sensor (5) of three-phase commutation bridge (3) DC side output current, detect second AC current sensor (6) of stator double-winding asynchronous (1) controlled winding output current, and air velocity transducer (22), control loop comprises: digital signal processor (12), drive circuit (13),
Stator double-winding asynchronous (1) power winding outlet is connected with the AC of three-phase commutation bridge (14) through the 4th circuit breaker (20), three-phase commutation bridge (14) DC side is connected with direct current network through the second circuit breaker (16), stator double-winding asynchronous (1) controlled winding outlet is connected with friendship AC-AC converter (3) side through the first circuit breaker (15), AC-AC converter (3) opposite side is handed over to be connected with filter inductance (2) one end, filter inductance (2) other end is connected with AC network with through the 3rd circuit breaker (17), stator double-winding asynchronous (1) controlled winding outlet, the 5th circuit breaker (21) is connected between the outlet of power winding, first AC voltage sensor (7) is connected on AC network side, first direct current voltage sensor (8) is connected on direct current network side, second direct current voltage sensor (9) is connected on three-phase commutation bridge (14) DC side, second AC voltage sensor (10), second AC current sensor (6) is all connected in the first circuit breaker (15) outlet, 3rd AC voltage sensor (11) is connected on the 3rd circuit breaker (17) inlet wire, first AC current sensor (4) is connected on the junction of handing over AC-AC converter (3) and filter inductance (2), DC current sensor (5) is connected on three-phase commutation bridge (14) DC side, drive circuit (13) input, first AC voltage sensor (7) output, first direct current voltage sensor (8) output, second direct current voltage sensor (9) output, second AC voltage sensor (10) output, 3rd AC voltage sensor (11) output, first AC current sensor (4) output, DC current sensor (5) output, second AC current sensor (6) output is connected with digital signal processor (12) respectively, drive circuit (13) exports termination and hands over power device control end in AC-AC converter (3), the controller of each circuit breaker is connected with digital signal processor (12) respectively,
Digital signal processor (12) is according to wind speed, ac grid voltage, direct current network voltage, three-phase commutation bridge (14) DC side output voltage and electric current, stator double-winding asynchronous (1) controlled winding output voltage and electric current, 3rd circuit breaker (17) primary voltage, AC-AC converter (3) and filter inductance (2) junction electric current is handed over to obtain the input signal of drive circuit (13), hand over AC-AC converter (3) under drive singal effect by the energy transferring of AC network to direct current network or simultaneously by energy transferring to AC network, direct current network, digital signal processor (12) controls the second circuit breaker (16) when three-phase commutation bridge (14) DC side output voltage and direct current network voltage synchronous and closes a floodgate, digital signal processor (12) controls the 3rd circuit breaker (17) when the voltage that friendship AC-AC converter (3) passes to AC network side is synchronous with ac grid voltage and closes a floodgate.
2. the topological structure of microgrid DWIG alternating current-direct current electricity generation system according to claim 1, is characterized in that described friendship AC-AC converter (3) comprises the first electric capacity (C1), second electric capacity (C2), 3rd electric capacity (C3), first switch (S1), second switch (S2), 3rd switch (S3), 4th switch (S4), 5th switch (S5), 6th switch (S6), described first electric capacity (C1) pole, first switch (S1) one end, 4th switch (S4) one end is connected, second electric capacity (C2) one pole is connected with the first electric capacity (C1) another pole, second switch (S2) one end is connected with the first switch (S1) other end, 5th switch (S5) one end is connected with the 4th switch (S4) other end, 3rd electric capacity (C3) one pole is connected with the second electric capacity (C2) another pole, 3rd switch (S3) one end is connected with second switch (S2) other end, 6th switch (S6) one end is connected with the 5th switch (S5) other end, the 3rd electric capacity (C3) another pole, 3rd switch (S3) other end, 6th switch (S6) other end is connected, the tie point of the first electric capacity (C1) and the second electric capacity (C2), the tie point of the first switch (S1) and second switch (S2), 4th switch (S4) forms with the tie point of the 5th switch (S5) side terminal handing over AC-AC converter, the tie point of the second electric capacity (C2) and the 3rd electric capacity (C3), the tie point of second switch (S2) and the 3rd switch (S3), 5th switch (S5) forms with the tie point of the 6th switch (S6) the opposite side terminal handing over AC-AC converter.
3. the control method of DWIG alternating current-direct current electricity generation system of microgrid described in claim 1 or 2, is characterized in that, digital signal processor (12) generates the control strategy in each wind speed district according to the signal of telecommunication of the wind speed of air velocity transducer collection and each transducer collection:
Without wind speed district control strategy, digital signal processor (12) controls the first circuit breaker (15) separating brake, the 4th circuit breaker (20) separating brake, the 5th circuit breaker (21) combined floodgate, the 3rd circuit breaker (17) combined floodgate, hands over AC-AC converter (3) by AC network energy transferring to direct current network;
Low wind speed district control strategy, AC-AC converter (3) is handed over to regulate active power and the reactive power of stator double-winding asynchronous controlled winding, and by handing over AC-AC converter (3) that AC energy is passed to AC network, digital signal processor (12) controls the 3rd circuit breaker (17) when the voltage that friendship AC-AC converter (3) passes to AC network side is synchronous with ac grid voltage and closes a floodgate, and DWIG electricity generation system is incorporated to AC network;
High wind speed district control strategy, AC-AC converter (3) is handed over to regulate active power and the reactive power of stator double-winding asynchronous controlled winding, both from controlled winding, hand over AC-AC converter (3) that the AC energy that the AC energy of variable voltage variable frequency is transformed into constant voltage constant frequency is passed to AC network, again from power winding, AC energy is rectified into direct current energy and passes to direct current network by three-phase commutation bridge (15), digital signal processor (12) controls the second circuit breaker (16) when three-phase commutation bridge (14) DC side output voltage and direct current network voltage synchronous and closes a floodgate, DWIG electricity generation system is incorporated to direct current network, control the 3rd circuit breaker (17) when the voltage that friendship AC-AC converter (3) passes to AC network side is synchronous with ac grid voltage to close a floodgate, DWIG electricity generation system is incorporated to AC network, achieve alternating current-direct current simultaneously grid-connected.
4. control method according to claim 3, it is characterized in that in described low wind speed district control strategy and high wind speed district control strategy, the coupled relation of stator double-winding asynchronous double winding can also be utilized, by handing over active power and the reactive power of AC-AC converter (3) regulable control winding side.
5. control method according to claim 4, is characterized in that in described low wind speed Region control strategy, utilizes voltage pump rise principle, by handing over AC-AC converter (3), AC energy is passed to AC network.
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|---|---|---|---|---|
| CN109217753A (en) * | 2018-09-25 | 2019-01-15 | 南京航空航天大学 | A kind of topological structure and control method of alternating current-direct current electricity generation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109217753A (en) * | 2018-09-25 | 2019-01-15 | 南京航空航天大学 | A kind of topological structure and control method of alternating current-direct current electricity generation system |
| CN109217753B (en) * | 2018-09-25 | 2020-02-18 | 南京航空航天大学 | Topological structure of alternating current-direct current power generation system and control method |
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| CN104377737B (en) | 2016-04-27 |
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