CN115694210A - Wind power converter with direct-current side unloading function, system and unloading method - Google Patents
Wind power converter with direct-current side unloading function, system and unloading method Download PDFInfo
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- CN115694210A CN115694210A CN202211369922.0A CN202211369922A CN115694210A CN 115694210 A CN115694210 A CN 115694210A CN 202211369922 A CN202211369922 A CN 202211369922A CN 115694210 A CN115694210 A CN 115694210A
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Abstract
The invention relates to a wind power converter with a direct-current side unloading function, a system and an unloading method, belonging to the technical field of power electronics and comprising the following steps: the system comprises a network side alternating current circuit, a machine side alternating current circuit, a network side full-control device circuit, a machine side full-control device circuit and a direct current side circuit; the first end of the network side alternating current circuit is connected to a three-phase line of a power grid, the second end of the network side alternating current circuit is connected to the first end of the direct current side circuit through a network side full-control device circuit, and the second end of the direct current side circuit is connected to the machine side alternating current circuit through a machine side full-control device circuit. According to the invention, through the chopping circuit and the second-stage discharge circuit, fault unloading and normal unloading of frequent startup are realized, and the service life of the wind power converter is prolonged; meanwhile, the bus grounding is indirectly realized through the discharge resistor in the second-stage discharge loop, and the potential safety hazard when maintenance personnel mistakenly touch the bus is eliminated; in addition, the invention can also carry out unloading prompt through the display loop.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a wind power converter with a direct-current side unloading function, a system and an unloading method.
Background
The method has the advantages that the direct current side unloading time is provided with strict requirements, and the direct current side discharging design of the traditional wind power converter at present needs the unloading time of minute level and is slow if the unloading is realized through a fixed load, so that the requirement cannot be met. If want to realize fast off-load and can only realize through the drive chopper return circuit, in view of chopper return circuit cost is higher relatively, if frequently start the life that can influence wind power converter, and traditional wind power converter does not set up the generating line earth connection, like this when maintaining, has the potential safety hazard, this for prior art's weak point.
In view of the above, the invention provides a wind power converter with a direct-current side unloading function, a system and an unloading method; it is very necessary to solve the above-mentioned defects existing in the prior art.
Disclosure of Invention
The invention aims to provide a wind power converter with a direct-current side unloading function, a system and an unloading method aiming at the defects that the existing wind power converter cannot be unloaded quickly and lacks a bus grounding wire in the prior art so as to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, the present invention provides a wind power converter with a dc side load shedding function, comprising: the system comprises a network side alternating current circuit, a machine side alternating current circuit, a network side full-control device circuit, a machine side full-control device circuit and a direct current side circuit;
the first end of the network side alternating current circuit is connected to a three-phase line of a power grid, the second end of the network side alternating current circuit is connected to the first end of the direct current side circuit through a network side full-control device circuit, and the second end of the direct current side circuit is connected to the machine side alternating current circuit through a machine side full-control device circuit;
the direct current side circuit comprises a voltmeter, a display circuit, a driving circuit, a second-stage discharge circuit, a resistor R3, a resistor R4 and a chopping circuit; the display loop comprises a diode D1, a resistor R1 and a light emitting diode D2; the driving circuit comprises a driving power supply and a breaker, the driving power supply is connected to a second-stage discharge circuit through a breaker normally-closed auxiliary contact, the second-stage discharge circuit comprises a resistor R2 and a triode Q1, and the chopping circuit comprises a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a fully-controlled switching tube Q2 and a fully-controlled switching tube Q3; the voltmeter is connected in parallel at two ends of the direct-current side circuit, the cathode of the diode D1 is connected to the network side full-control device circuit, the anode of the diode D1 is connected to the cathode of the light-emitting diode D2 through the resistor R1, the anode of the light-emitting diode D2 is connected to the first end of the normally closed auxiliary contact of the circuit breaker, and the second end of the normally closed auxiliary contact of the circuit breaker is connected to the driving power supply; the first end of the resistor R2 is connected to the negative electrode of the diode D1, the second end of the resistor R2 is connected to the emitting electrode of the triode Q1, the base electrode of the triode Q1 is connected to the first end of the normally closed auxiliary contact of the circuit breaker, and the collector electrode of the triode Q1 is connected to the network side full-control device circuit; a first end of the resistor R3 is connected to the cathode of the diode D1, a second end of the resistor R3 is respectively connected to the grid-side full-control device circuit, the machine-side full-control device circuit and a first end of the resistor R4, and a second end of the resistor R4 is connected to a collector of the triode Q1; the capacitor C1 is connected in parallel with two ends of the resistor R3, a first end of the resistor R3 is connected to a collector of the fully-controlled switch tube Q2 through a resistor R5, and an emitter of the fully-controlled switch tube Q2 is connected to a second end of the resistor R3; the capacitor C2 is connected in parallel to two ends of the resistor R4, a first end of the resistor R4 is connected to a collector of the fully-controlled switch Q3 through a resistor R6, and an emitter of the fully-controlled switch Q3 is connected to a second end of the resistor R4.
In one embodiment, the network-side fully-controlled device circuit includes a fully-controlled switch Q4, a fully-controlled switch Q5, a fully-controlled switch Q6, a fully-controlled switch Q7, a fully-controlled switch Q8, a fully-controlled switch Q9, a fully-controlled switch Q10, a fully-controlled switch Q11, a fully-controlled switch Q12, a fully-controlled switch Q13, a fully-controlled switch Q14, a fully-controlled switch Q15, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, and a diode D8.
In one embodiment, the collector of the fully-controlled switch Q4, the collector of the fully-controlled switch Q5 and the collector of the fully-controlled switch Q6 are all connected to the cathode of the diode D1, the emitter of the fully-controlled switch Q4 is connected to the cathode of the diode D3 and the collector of the fully-controlled switch Q7, the anode of the diode D3 is connected to the second end of the resistor R3, and the emitter of the fully-controlled switch Q7 is connected to the grid-side ac circuit and the collector of the fully-controlled switch Q10; an emitting electrode of the fully-controlled switch tube Q5 is connected to a negative electrode of the diode D4 and a collector electrode of the fully-controlled switch tube Q8, an anode of the diode D4 is connected to a second end of the resistor R3, and an emitting electrode of the fully-controlled switch tube Q8 is connected to a network-side alternating current circuit and a collector electrode of the fully-controlled switch tube Q11; the emitter of the fully-controlled switch tube Q6 is connected to the cathode of the diode D5 and the collector of the fully-controlled switch tube Q9, the anode of the diode D5 is connected to the second end of the resistor R3, and the emitter of the fully-controlled switch tube Q9 is connected to the grid-side alternating current circuit and the collector of the fully-controlled switch tube Q12;
an emitter of the fully-controlled switch tube Q10 is connected to a collector of the fully-controlled switch tube Q13 and an anode of the diode D6, a cathode of the diode D6 is connected to a second end of the resistor R3, and an emitter of the fully-controlled switch tube Q13 is connected to a collector of the triode Q1; an emitter of the fully-controlled switch tube Q11 is connected to a collector of the fully-controlled switch tube Q14 and an anode of the diode D7, a cathode of the diode D7 is connected to the second end of the resistor R3, and an emitter of the fully-controlled switch tube Q14 is connected to a collector of the triode Q1; the emitter of the fully-controlled switch Q12 is connected to the collector of the fully-controlled switch Q15 and the anode of the diode D8, the cathode of the diode D8 is connected to the second end of the resistor R3, and the emitter of the fully-controlled switch Q15 is connected to the collector of the transistor Q1.
In one embodiment, the machine side fully-controlled device circuit includes a fully-controlled switch Q16, a fully-controlled switch Q17, a fully-controlled switch Q18, a fully-controlled switch Q19, a fully-controlled switch Q20, a fully-controlled switch Q21, a fully-controlled switch Q22, a fully-controlled switch Q23, a fully-controlled switch Q24, a fully-controlled switch Q25, a fully-controlled switch Q26, a fully-controlled switch Q27, a diode D9, a diode D10, a diode D11, a diode D12, a diode D13, and a diode D14.
In one embodiment, the collector of the fully-controlled switch Q16, the collector of the fully-controlled switch Q17 and the collector of the fully-controlled switch Q18 are all connected to the negative electrode of the diode D1, the emitter of the fully-controlled switch Q16 is connected to the collector of the fully-controlled switch Q19, the emitter of the fully-controlled switch Q19 is connected to the machine-side ac circuit, the collector of the fully-controlled switch Q22 and the negative electrode of the diode D9, and the positive electrode of the diode D9 is connected to the second end of the resistor R3; an emitter of the fully-controlled switch tube Q17 is connected to a collector of the fully-controlled switch tube Q20, an emitter of the fully-controlled switch tube Q20 is connected to the machine-side alternating-current circuit, the collector of the fully-controlled switch tube Q23 and a cathode of the diode D10, and an anode of the diode D10 is connected to a second end of the resistor R3; an emitter of the fully-controlled switch tube Q18 is connected to a collector of the fully-controlled switch tube Q21, the emitter of the fully-controlled switch tube Q21 is connected to the machine-side alternating current circuit, the collector of the fully-controlled switch tube Q24 and the cathode of the diode D11, and the anode of the diode D11 is connected to the second end of the resistor R3;
the collector of the fully-controlled switch tube Q22 is further connected to the anode of the diode D12, the cathode of the diode D12 is connected to the second end of the resistor R3, the collector of the fully-controlled switch tube Q23 is further connected to the anode of the diode D13, the cathode of the diode D13 is connected to the second end of the resistor R3, the collector of the fully-controlled switch tube Q24 is further connected to the anode of the diode D14, and the cathode of the diode D14 is connected to the second end of the resistor R3; the emitter of the fully-controlled switch Q22 is connected to the collector of the fully-controlled switch Q25, the emitter of the fully-controlled switch Q23 is connected to the collector of the fully-controlled switch Q26, the emitter of the fully-controlled switch Q24 is connected to the collector of the fully-controlled switch Q27, and the emitters of the fully-controlled switch Q25, the fully-controlled switch Q26 and the fully-controlled switch Q27 are connected to the collector of the triode Q1.
In one embodiment, the grid-side alternating-current circuit comprises an inductor L1, an inductor L2 and an inductor L3 which are connected in series on three phase lines of a power grid, and a current transformer CT1, a current transformer CT2 and a current transformer CT3 which are installed on the three phase lines of the power grid.
In one embodiment, the machine side alternating current circuit comprises an inductor L4, an inductor L5 and an inductor L6 which are connected in series on the three phase lines of the power grid, and a current transformer CT4, a current transformer CT5 and a current transformer CT6 which are installed on the three phase lines of the power grid.
In one embodiment, the first end of the grid-side ac circuit is connected to the three-phase line of the power grid through the normally open auxiliary contacts of the circuit breaker.
In a second aspect, the present invention provides a system with a dc side load shedding function, comprising a control module, a generator, and a wind power converter with a dc side load shedding function as described in any one of the above.
In a third aspect, the present invention provides an unloading method based on the above system, including:
the control module judges whether the system is in a maintenance state, whether the system has a complete machine fault and whether the wind power converter has a fault;
if the system is in a maintenance state, or the system has a complete machine fault, or the wind power converter has a fault, starting the chopping circuit for unloading;
if the system is not in a maintenance state, the system has no complete machine fault, and the wind power converter has no fault, judging that the system is in non-fault shutdown at the moment; when the system is in a non-fault shutdown state, judging whether the breaker is in a breaking state;
if the breaker is in a breaking state, unloading is carried out through the second-stage discharge loop; if the circuit breaker is in a closed state, judging whether the direct-current side voltage acquired by the voltmeter is greater than or equal to 80% of direct-current side reference voltage;
if the obtained direct-current side voltage is greater than or equal to 80% of the direct-current side reference voltage, judging whether a start-up instruction and a network side starting instruction are received; if the acquired direct-current side voltage is less than 80% of the direct-current side reference voltage, pre-charging is carried out;
if a start-up instruction and a network side start-up instruction are received, a network side alternating current circuit and a network side full-control device circuit are started first, and then a machine side alternating current circuit and a machine side full-control device circuit are started; otherwise, whether the start-up instruction and the network side starting instruction are received or not is judged again.
The invention has the advantages that fault unloading and normal frequent start unloading are realized through the chopping circuit and the second-stage discharge circuit, and the service life of the wind power converter is prolonged; meanwhile, the bus grounding is indirectly realized through the discharge resistor in the second-stage discharge loop, and the potential safety hazard when maintenance personnel mistakenly touch the bus is eliminated; in addition, the invention can also carry out unloading prompt through the display loop.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
Fig. 1 is a schematic circuit diagram of a wind power converter.
FIG. 2 is a relationship diagram of the system.
Fig. 3 is a schematic flow diagram of an unloading method.
The system comprises a wind power converter 1, a grid side alternating current circuit 11, a machine side alternating current circuit 12, a network side full-control device circuit 13, a machine side full-control device circuit 14, a direct current side circuit 15, a normally closed auxiliary contact of a breaker QF-1, a normally open auxiliary contact of the breaker QF-0, a voltmeter 6, a controller 7 and a generator 8.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings by way of specific examples, which are illustrative of the present invention and are not limited to the following embodiments.
As shown in fig. 1, the present invention provides a wind power converter with dc side unloading function, comprising: the system comprises a network side alternating current circuit, a machine side alternating current circuit, a network side full-control device circuit, a machine side full-control device circuit and a direct current side circuit; the first end of the network side alternating current circuit is connected to a three-phase line of a power grid, and specifically, the first end of the network side alternating current circuit is connected to the three-phase line of the power grid through a normally open auxiliary contact of a circuit breaker; and the second end of the network side alternating current circuit is connected to the first end of the direct current side circuit through the network side full-control device circuit, and the second end of the direct current side circuit is connected to the machine side alternating current circuit through the machine side full-control device circuit.
Specifically, the direct-current side circuit comprises a voltmeter, a display circuit, a driving circuit, a second-stage discharge circuit, a resistor R3, a resistor R4 and a chopper circuit; the display loop comprises a diode D1, a resistor R1 and a light emitting diode D2; the driving circuit comprises a driving power supply and a circuit breaker, the driving power supply is connected to a second-stage discharge circuit through a normally closed auxiliary contact of the circuit breaker, the second-stage discharge circuit comprises a resistor R2 and a triode Q1, and the chopping circuit comprises a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a fully-controlled switch tube Q2 and a fully-controlled switch tube Q3; the voltmeter is connected in parallel at two ends of the direct-current side circuit, the cathode of the diode D1 is connected to the network side full-control device circuit, the anode of the diode D1 is connected to the cathode of the light-emitting diode D2 through the resistor R1, the anode of the light-emitting diode D2 is connected to the first end of the normally closed auxiliary contact of the circuit breaker, and the second end of the normally closed auxiliary contact of the circuit breaker is connected to the driving power supply; the first end of the resistor R2 is connected to the negative electrode of the diode D1, the second end of the resistor R2 is connected to the emitting electrode of the triode Q1, the base electrode of the triode Q1 is connected to the first end of the normally closed auxiliary contact of the circuit breaker, and the collector electrode of the triode Q1 is connected to the network side full-control device circuit; a first end of the resistor R3 is connected to the cathode of the diode D1, a second end of the resistor R3 is respectively connected to the network side full-control device circuit, the machine side full-control device circuit and a first end of the resistor R4, and a second end of the resistor R4 is connected to a collector of the triode Q1; the capacitor C1 is connected in parallel at two ends of the resistor R3, a first end of the resistor R3 is connected to a collector of the fully-controlled switch tube Q2 through a resistor R5, and an emitter of the fully-controlled switch tube Q2 is connected to a second end of the resistor R3; the capacitor C2 is connected in parallel to two ends of the resistor R4, a first end of the resistor R4 is connected to a collector of the fully-controlled switch Q3 through a resistor R6, and an emitter of the fully-controlled switch Q3 is connected to a second end of the resistor R4.
The network side full-control device circuit comprises a full-control type switch tube Q4, a full-control type switch tube Q5, a full-control type switch tube Q6, a full-control type switch tube Q7, a full-control type switch tube Q8, a full-control type switch tube Q9, a full-control type switch tube Q10, a full-control type switch tube Q11, a full-control type switch tube Q12, a full-control type switch tube Q13, a full-control type switch tube Q14, a full-control type switch tube Q15, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7 and a diode D8; the collector of the fully-controlled switch tube Q4, the collector of the fully-controlled switch tube Q5 and the collector of the fully-controlled switch tube Q6 are connected to the cathode of the diode D1, the emitter of the fully-controlled switch tube Q4 is connected to the cathode of the diode D3 and the collector of the fully-controlled switch tube Q7, the anode of the diode D3 is connected to the second end of the resistor R3, and the emitter of the fully-controlled switch tube Q7 is connected to the grid-side alternating current circuit and the collector of the fully-controlled switch tube Q10; the emitter of the fully-controlled switch tube Q5 is connected to the cathode of the diode D4 and the collector of the fully-controlled switch tube Q8, the anode of the diode D4 is connected to the second end of the resistor R3, and the emitter of the fully-controlled switch tube Q8 is connected to the grid-side alternating current circuit and the collector of the fully-controlled switch tube Q11; the emitter of the fully-controlled switch tube Q6 is connected to the cathode of the diode D5 and the collector of the fully-controlled switch tube Q9, the anode of the diode D5 is connected to the second end of the resistor R3, and the emitter of the fully-controlled switch tube Q9 is connected to the grid-side alternating current circuit and the collector of the fully-controlled switch tube Q12; an emitter of the fully-controlled switch tube Q10 is connected to a collector of the fully-controlled switch tube Q13 and an anode of the diode D6, a cathode of the diode D6 is connected to a second end of the resistor R3, and an emitter of the fully-controlled switch tube Q13 is connected to a collector of the triode Q1; an emitter of the fully-controlled switch tube Q11 is connected to a collector of the fully-controlled switch tube Q14 and an anode of the diode D7, a cathode of the diode D7 is connected to the second end of the resistor R3, and an emitter of the fully-controlled switch tube Q14 is connected to a collector of the triode Q1; the emitter of the fully-controlled switch Q12 is connected to the collector of the fully-controlled switch Q15 and the anode of the diode D8, the cathode of the diode D8 is connected to the second end of the resistor R3, and the emitter of the fully-controlled switch Q15 is connected to the collector of the transistor Q1.
The machine side full-control device circuit comprises a full-control type switch tube Q16, a full-control type switch tube Q17, a full-control type switch tube Q18, a full-control type switch tube Q19, a full-control type switch tube Q20, a full-control type switch tube Q21, a full-control type switch tube Q22, a full-control type switch tube Q23, a full-control type switch tube Q24, a full-control type switch tube Q25, a full-control type switch tube Q26, a full-control type switch tube Q27, a diode D9, a diode D10, a diode D11, a diode D12, a diode D13 and a diode D14; the collector of the fully-controlled switch tube Q16, the collector of the fully-controlled switch tube Q17 and the collector of the fully-controlled switch tube Q18 are connected to the negative electrode of the diode D1, the emitter of the fully-controlled switch tube Q16 is connected to the collector of the fully-controlled switch tube Q19, the emitter of the fully-controlled switch tube Q19 is connected to the machine-side alternating-current circuit, the collector of the fully-controlled switch tube Q22 and the negative electrode of the diode D9, and the positive electrode of the diode D9 is connected to the second end of the resistor R3; an emitter of the fully-controlled switch tube Q17 is connected to a collector of the fully-controlled switch tube Q20, an emitter of the fully-controlled switch tube Q20 is connected to the machine-side alternating-current circuit, the collector of the fully-controlled switch tube Q23 and a cathode of the diode D10, and an anode of the diode D10 is connected to a second end of the resistor R3; the emitter of the fully-controlled switch tube Q18 is connected to the collector of the fully-controlled switch tube Q21, the emitter of the fully-controlled switch tube Q21 is connected to the machine-side alternating-current circuit, the collector of the fully-controlled switch tube Q24 and the cathode of the diode D11, and the anode of the diode D11 is connected to the second end of the resistor R3; the collector of the fully-controlled switch tube Q22 is further connected to the anode of the diode D12, the cathode of the diode D12 is connected to the second end of the resistor R3, the collector of the fully-controlled switch tube Q23 is further connected to the anode of the diode D13, the cathode of the diode D13 is connected to the second end of the resistor R3, the collector of the fully-controlled switch tube Q24 is further connected to the anode of the diode D14, and the cathode of the diode D14 is connected to the second end of the resistor R3; the emitter of the fully-controlled switch Q22 is connected to the collector of the fully-controlled switch Q25, the emitter of the fully-controlled switch Q23 is connected to the collector of the fully-controlled switch Q26, the emitter of the fully-controlled switch Q24 is connected to the collector of the fully-controlled switch Q27, and the emitters of the fully-controlled switch Q25, the fully-controlled switch Q26 and the fully-controlled switch Q27 are connected to the collector of the triode Q1.
The network side alternating current circuit comprises an inductor L1, an inductor L2 and an inductor L3 which are connected in series on a three-phase line of the power grid, and a current transformer CT1, a current transformer CT2 and a current transformer CT3 which are arranged on the three-phase line of the power grid; the machine side alternating current circuit comprises an inductor L4, an inductor L5 and an inductor L6 which are connected in series on the three-phase line of the power grid, and a current transformer CT4, a current transformer CT5 and a current transformer CT6 which are installed on the three-phase line of the power grid.
As long as the breaker is disconnected, the wind power converter can be unloaded through the resistor R2, and the unloading time is usually in the second time level. So resistance R2 can also act as ground resistance's effect, realizes bus grounding, eliminates the potential safety hazard when maintainer mistake touches the generating line.
When the unloading of the direct current side circuit is finished, namely when the bus voltage is lower than the preset voltage of the driving circuit, the light emitting diode D2 gives a prompt.
As shown in fig. 2, the present invention provides a system with dc side load shedding function, which comprises a control module, a generator and a wind power converter with dc side load shedding function as described above, wherein the controller is connected to the generator through the wind power converter.
As shown in fig. 3, the present invention provides an unloading method based on the system, including:
s1, a control module judges whether a system is in a maintenance state, whether the system has a complete machine fault or not and whether a wind power converter has a fault or not;
s2, if the system is in a maintenance state, or the system has a complete machine fault, or the wind power converter has a fault, starting a chopping circuit to unload;
s3, if the system is not in a maintenance state, the system does not have a complete machine fault, and the wind power converter does not have a fault, judging that the system is in a non-fault shutdown state at the moment; when the system is in a non-fault shutdown state, judging whether the breaker is in a breaking state;
s4, if the breaker is in a breaking state, unloading is carried out through the second-stage discharge loop; if the circuit breaker is in a closed state, judging whether the direct-current side voltage acquired by the voltmeter is greater than or equal to 80% of direct-current side reference voltage;
s5, if the obtained direct-current side voltage is greater than or equal to 80% of direct-current side reference voltage, judging whether a start-up instruction and a network side start-up instruction are received; if the acquired direct-current side voltage is less than 80% of the direct-current side reference voltage, pre-charging is carried out;
s6, if a start-up instruction and a network side start-up instruction are received, starting a network side alternating current circuit and a network side full-control device circuit, and then starting a machine side alternating current circuit and a machine side full-control device circuit; otherwise, whether the start-up instruction and the network side starting instruction are received or not is judged again.
The above disclosure is only for the preferred embodiments of the present invention, but the present invention is not limited thereto, and any non-inventive changes that can be made by those skilled in the art and several modifications and amendments made without departing from the principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a wind power converter that possesses direct current side unloading function which characterized in that includes: the system comprises a network side alternating current circuit, a machine side alternating current circuit, a network side full-control device circuit, a machine side full-control device circuit and a direct current side circuit;
the first end of the network side alternating current circuit is connected to a three-phase line of a power grid, the second end of the network side alternating current circuit is connected to the first end of the direct current side circuit through a network side full-control device circuit, and the second end of the direct current side circuit is connected to the machine side alternating current circuit through a machine side full-control device circuit;
the direct current side circuit comprises a voltmeter, a display circuit, a driving circuit, a second-stage discharge circuit, a resistor R3, a resistor R4 and a chopping circuit; the display loop comprises a diode D1, a resistor R1 and a light emitting diode D2; the driving circuit comprises a driving power supply and a circuit breaker, the driving power supply is connected to a second-stage discharge circuit through a normally closed auxiliary contact of the circuit breaker, the second-stage discharge circuit comprises a resistor R2 and a triode Q1, and the chopping circuit comprises a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a fully-controlled switch tube Q2 and a fully-controlled switch tube Q3; the voltmeter is connected in parallel at two ends of the direct current side circuit, the cathode of the diode D1 is connected to the network side full-control device circuit, the anode of the diode D1 is connected to the cathode of the light-emitting diode D2 through the resistor R1, the anode of the light-emitting diode D2 is connected to the first end of the normally closed auxiliary contact of the circuit breaker, and the second end of the normally closed auxiliary contact of the circuit breaker is connected to the driving power supply; the first end of the resistor R2 is connected to the negative electrode of the diode D1, the second end of the resistor R2 is connected to the emitting electrode of the triode Q1, the base electrode of the triode Q1 is connected to the first end of the normally closed auxiliary contact of the circuit breaker, and the collector electrode of the triode Q1 is connected to the network side full-control device circuit; a first end of the resistor R3 is connected to the cathode of the diode D1, a second end of the resistor R3 is respectively connected to the network side full-control device circuit, the machine side full-control device circuit and a first end of the resistor R4, and a second end of the resistor R4 is connected to a collector of the triode Q1; the capacitor C1 is connected in parallel with two ends of the resistor R3, a first end of the resistor R3 is connected to a collector of the fully-controlled switch tube Q2 through a resistor R5, and an emitter of the fully-controlled switch tube Q2 is connected to a second end of the resistor R3; the capacitor C2 is connected in parallel to two ends of the resistor R4, a first end of the resistor R4 is connected to a collector of the fully-controlled switch Q3 through a resistor R6, and an emitter of the fully-controlled switch Q3 is connected to a second end of the resistor R4.
2. The wind power converter with dc side discharging function according to claim 1, wherein the grid side full control device circuit comprises a full control type switch Q4, a full control type switch Q5, a full control type switch Q6, a full control type switch Q7, a full control type switch Q8, a full control type switch Q9, a full control type switch Q10, a full control type switch Q11, a full control type switch Q12, a full control type switch Q13, a full control type switch Q14, a full control type switch Q15, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7 and a diode D8.
3. The wind power converter with dc side load shedding function according to claim 2, wherein the collector of the fully controlled switch Q4, the collector of the fully controlled switch Q5 and the collector of the fully controlled switch Q6 are all connected to the cathode of the diode D1, the emitter of the fully controlled switch Q4 is connected to the cathode of the diode D3 and the collector of the fully controlled switch Q7, the anode of the diode D3 is connected to the second end of the resistor R3, and the emitter of the fully controlled switch Q7 is connected to the grid side ac circuit and the collector of the fully controlled switch Q10; the emitter of the fully-controlled switch tube Q5 is connected to the cathode of the diode D4 and the collector of the fully-controlled switch tube Q8, the anode of the diode D4 is connected to the second end of the resistor R3, and the emitter of the fully-controlled switch tube Q8 is connected to the grid-side alternating current circuit and the collector of the fully-controlled switch tube Q11; the emitter of the fully-controlled switch tube Q6 is connected to the cathode of the diode D5 and the collector of the fully-controlled switch tube Q9, the anode of the diode D5 is connected to the second end of the resistor R3, and the emitter of the fully-controlled switch tube Q9 is connected to the grid-side alternating current circuit and the collector of the fully-controlled switch tube Q12;
an emitter of the fully-controlled switch tube Q10 is connected to a collector of the fully-controlled switch tube Q13 and an anode of the diode D6, a cathode of the diode D6 is connected to a second end of the resistor R3, and an emitter of the fully-controlled switch tube Q13 is connected to a collector of the triode Q1; an emitter of the fully-controlled switch tube Q11 is connected to a collector of the fully-controlled switch tube Q14 and an anode of the diode D7, a cathode of the diode D7 is connected to the second end of the resistor R3, and an emitter of the fully-controlled switch tube Q14 is connected to a collector of the triode Q1; the emitter of the fully-controlled switch Q12 is connected to the collector of the fully-controlled switch Q15 and the anode of the diode D8, the cathode of the diode D8 is connected to the second end of the resistor R3, and the emitter of the fully-controlled switch Q15 is connected to the collector of the transistor Q1.
4. The wind power converter with the direct-current side load shedding function according to claim 3, wherein the machine side full-control device circuit comprises a full-control type switch tube Q16, a full-control type switch tube Q17, a full-control type switch tube Q18, a full-control type switch tube Q19, a full-control type switch tube Q20, a full-control type switch tube Q21, a full-control type switch tube Q22, a full-control type switch tube Q23, a full-control type switch tube Q24, a full-control type switch tube Q25, a full-control type switch tube Q26, a full-control type switch tube Q27, a diode D9, a diode D10, a diode D11, a diode D12, a diode D13 and a diode D14.
5. The wind power converter with the dc side load shedding function according to claim 4, wherein the collector of the fully controlled transistor Q16, the collector of the fully controlled transistor Q17 and the collector of the fully controlled transistor Q18 are all connected to the negative terminal of a diode D1, the emitter of the fully controlled transistor Q16 is connected to the collector of a fully controlled transistor Q19, the emitter of the fully controlled transistor Q19 is connected to the ac circuit at the machine side, the collector of the fully controlled transistor Q22 and the negative terminal of a diode D9, and the positive terminal of the diode D9 is connected to the second terminal of the resistor R3; an emitter of the fully-controlled switch tube Q17 is connected to a collector of the fully-controlled switch tube Q20, an emitter of the fully-controlled switch tube Q20 is connected to the machine-side alternating-current circuit, the collector of the fully-controlled switch tube Q23 and a cathode of the diode D10, and an anode of the diode D10 is connected to a second end of the resistor R3; the emitter of the fully-controlled switch tube Q18 is connected to the collector of the fully-controlled switch tube Q21, the emitter of the fully-controlled switch tube Q21 is connected to the machine-side alternating-current circuit, the collector of the fully-controlled switch tube Q24 and the cathode of the diode D11, and the anode of the diode D11 is connected to the second end of the resistor R3;
the collector of the fully-controlled switch tube Q22 is further connected to the anode of the diode D12, the cathode of the diode D12 is connected to the second end of the resistor R3, the collector of the fully-controlled switch tube Q23 is further connected to the anode of the diode D13, the cathode of the diode D13 is connected to the second end of the resistor R3, the collector of the fully-controlled switch tube Q24 is further connected to the anode of the diode D14, and the cathode of the diode D14 is connected to the second end of the resistor R3; the emitter of the fully-controlled switch Q22 is connected to the collector of the fully-controlled switch Q25, the emitter of the fully-controlled switch Q23 is connected to the collector of the fully-controlled switch Q26, the emitter of the fully-controlled switch Q24 is connected to the collector of the fully-controlled switch Q27, and the emitters of the fully-controlled switch Q25, the fully-controlled switch Q26 and the fully-controlled switch Q27 are connected to the collector of the triode Q1.
6. The wind power converter with the direct-current side load shedding function according to claim 2, wherein the grid-side alternating-current circuit comprises an inductor L1, an inductor L2 and an inductor L3 which are connected in series on three phase lines of a power grid, and a current transformer CT1, a current transformer CT2 and a current transformer CT3 which are installed on the three phase lines of the power grid.
7. The wind power converter with the direct-current side load shedding function according to claim 2, wherein the machine side alternating current circuit comprises an inductor L4, an inductor L5 and an inductor L6 which are connected in series on three phase lines of a power grid, and a current transformer CT4, a current transformer CT5 and a current transformer CT6 which are installed on the three phase lines of the power grid.
8. The wind power converter with direct current side load shedding function according to claim 1, wherein the first end of the grid side alternating current circuit is connected to the three-phase line of the power grid through a normally open auxiliary contact of a circuit breaker.
9. A system with a direct-current side load shedding function, which is characterized by comprising a control module, a generator and the wind power converter with the direct-current side load shedding function as claimed in any one of claims 1 to 8.
10. An unloading method based on the system of claim 9, comprising:
the control module judges whether the system is in a maintenance state, whether the system has a complete machine fault and whether the wind power converter has a fault;
if the system is in a maintenance state, or the system has a complete machine fault, or the wind power converter has a fault, starting the chopping circuit for unloading;
if the system is not in a maintenance state, the system has no complete machine fault, and the wind power converter has no fault, judging that the system is in non-fault shutdown at the moment; when the system is in a non-fault shutdown state, judging whether the breaker is in a breaking state;
if the breaker is in a breaking state, unloading is carried out through the second-stage discharge loop; if the circuit breaker is in a closed state, judging whether the direct-current side voltage acquired by the voltmeter is greater than or equal to 80% of direct-current side reference voltage;
if the obtained direct-current side voltage is greater than or equal to 80% of the direct-current side reference voltage, judging whether a start-up instruction and a network side starting instruction are received; if the acquired direct-current side voltage is less than 80% of the direct-current side reference voltage, pre-charging is carried out;
if a startup instruction and a network side startup instruction are received, a network side alternating current circuit and a network side full control device circuit are started first, and then a machine side alternating current circuit and a machine side full control device circuit are started; otherwise, whether the start-up instruction and the network side starting instruction are received or not is judged again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211369922.0A CN115694210A (en) | 2022-11-03 | 2022-11-03 | Wind power converter with direct-current side unloading function, system and unloading method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211369922.0A CN115694210A (en) | 2022-11-03 | 2022-11-03 | Wind power converter with direct-current side unloading function, system and unloading method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115694210A true CN115694210A (en) | 2023-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211369922.0A Pending CN115694210A (en) | 2022-11-03 | 2022-11-03 | Wind power converter with direct-current side unloading function, system and unloading method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115694210A (en) |
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2022
- 2022-11-03 CN CN202211369922.0A patent/CN115694210A/en active Pending
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