CN214799344U - Excitation output de-excitation loop of generator - Google Patents
Excitation output de-excitation loop of generator Download PDFInfo
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- CN214799344U CN214799344U CN202121042718.9U CN202121042718U CN214799344U CN 214799344 U CN214799344 U CN 214799344U CN 202121042718 U CN202121042718 U CN 202121042718U CN 214799344 U CN214799344 U CN 214799344U
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Abstract
The utility model provides a generator excitation output de-excitation loop, include: a first three-phase rectifier bridge and a voltage regulator; the positive output end of the first three-phase rectifier bridge is connected with the negative end of a third diode after passing through a first diode and a second diode in sequence, the negative end of the third diode is connected with the negative end of a fourth diode, and the negative end of the fourth diode is connected with the positive end of an excitation power supply; the negative output end of the voltage regulator is connected with the positive end of a third diode, the positive end of the third diode is connected with the positive end of a fourth diode, and the positive end of the fourth diode is connected with the negative end of the excitation power supply; the current capacity of the excitation output de-excitation loop is greatly improved, the stability during de-excitation is ensured, a freewheeling diode in the AVR is protected, and the reliability of the whole excitation system is improved.
Description
Technical Field
The utility model relates to a generator excitation control technical field, in particular to generator excitation output de-excitation loop.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The inventor finds that when the existing generator excitation output de-excitation loop is used for normal de-excitation, the energy of the magnetic field established by the generator needs to be absorbed instantly, and the voltage regulator can be damaged; in the existing design of the field excitation output field suppression loop of the generator, a large-capacity diode is not connected in parallel, and energy during field suppression is absorbed by an internal freewheeling diode of an Automatic Voltage Regulator (AVR).
SUMMERY OF THE UTILITY MODEL
In order to solve the not enough of prior art, the utility model provides a generator excitation output deexcitation return circuit for the through-flow capacity of excitation output deexcitation return circuit improves greatly, and stability when having guaranteed the deexcitation has protected the inside freewheel diode of AVR, has improved the reliability for whole excitation system.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model discloses the first aspect provides a generator excitation output de-excitation circuit.
A generator excitation output de-excitation circuit comprising: a first three-phase rectifier bridge and a voltage regulator; the positive output end of the first three-phase rectifier bridge is connected with the negative end of a third diode after passing through a first diode and a second diode in sequence, the negative end of the third diode is connected with the negative end of a fourth diode, and the negative end of the fourth diode is connected with the positive end of an excitation power supply;
the negative output end of the voltage regulator is connected with the positive end of the third diode, the positive end of the third diode is connected with the positive end of the fourth diode, and the positive end of the fourth diode is connected with the negative end of the excitation power supply.
The direct-current negative output end of the second three-phase rectifier bridge is connected with the negative output end of the voltage regulator through a first normally open contact, and the first normally open contact is connected with a first resistor in parallel.
Further, the first resistor is a linear resistor, and the resistance range is 5-100 ohms.
Furthermore, the first port, the second port and the third port of the voltage regulator are respectively connected with the secondary side port of the power transformer through a switching element.
Furthermore, a fourth port, a fifth port and a sixth port of the voltage regulator are respectively connected with a secondary side port of the voltage transformer.
Furthermore, the direct current positive output end of the second three-phase rectifier bridge is connected with the second input end of the first three-phase rectifier bridge, and the first input end of the first three-phase rectifier bridge is connected with the positive output end of the voltage regulator.
Furthermore, the direct current positive output end of the first three-phase rectifier bridge is connected with the positive end of the excitation power supply.
Furthermore, the direct-current positive output end of the first three-phase rectifier bridge is connected with the first end of the adjustable resistor, and the second end of the adjustable resistor is connected with the direct-current positive output end of the third three-phase rectifier bridge;
the first input end of the third three-phase rectifier bridge is connected with the magnetizing switch, and the third input end of the third three-phase rectifier bridge is connected with an external magnetizing power supply.
Furthermore, the negative output end of the voltage regulator is connected with the negative end of the excitation power supply, and the negative output end of the voltage regulator is connected with the direct-current negative output end of the third three-phase rectifier bridge.
The utility model discloses the second aspect provides a generator, include the first aspect the generator excitation output demagnetization circuit.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the generator excitation output deexcitation return circuit for the through-flow capacity of excitation output deexcitation return circuit improves greatly, and stability when having guaranteed the deexcitation has protected the inside freewheel diode of AVR, has improved the reliability for whole excitation system.
2. Generator excitation output de-excitation circuit has both guaranteed to encourage the function normal operating by force at the force during operation, also makes when not encouraging by force, and AVR does not receive the interference.
3. Generator excitation output de-excitation circuit has all increased the rectifier bridge diode at parallel voltage positive pole and negative pole for external power source and AVR connect the isolation, and normal operating has blocked the interference, has improved the stability of system.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is a schematic diagram of a circuit for preventing interference in excitation forced excitation of a power generator provided in embodiment 1 of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the case of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.
Example 1:
as shown in fig. 1, embodiment 1 of the present invention provides a generator excitation strong excitation anti-interference circuit, including:
a first three-phase rectifier bridge V01 and a voltage regulator BASLER DECS-150; the positive output end of the first three-phase rectifier bridge V01 is connected with the negative end of a third diode D03 after passing through a first diode D01 and a second diode D02 in sequence, the negative end of the third diode D03 is connected with the negative end of a fourth diode D04, and the negative end of the fourth diode D04 is connected with the positive end F + of the excitation power supply;
the negative output terminal F-of the voltage regulator BASLER DECS-150 is connected with the positive terminal of the third diode D03, the positive terminal of the third diode D03 is connected with the positive terminal of the fourth diode D04, and the positive terminal of the fourth diode D04 is connected with the negative terminal F-of the excitation power supply.
The direct-current negative output end N of the second three-phase rectifier bridge V02 is connected with the negative output end F-of the voltage regulator through a first normally open contact K54, and the first normally open contact is connected with a first resistor R1 in parallel.
The excitation forced excitation of the generator refers to that when a short-circuit fault occurs outside a generator protection area, the voltage of the generator terminal is rapidly reduced, the current is severely attenuated, the current protection with time delay is attenuated to be below an action value before the current protection with time delay does not act, the current protection refuses to act or the action time is prolonged, and the fault removal time is delayed, so that the generator is forced excited, and the action reliability of the current protection with time delay is ensured. In addition, the terminal voltage of the generator end and the station bus can be maintained as much as possible, and the output of the auxiliary machine is prevented from being reduced, so that the output of the power plant is further reduced, and the system voltage is frequently broken down due to vicious circle.
The specific process of the forced excitation is as follows:
when the generator normally operates, the currents of T1, T2 and T3 of the forced excitation CT are transmitted to the normally closed contacts of R1, R2, R3 and R4 of a forced excitation relay K54 through a wiring terminal X1, the forced excitation current is short-circuited, and the forced excitation does not work at the moment.
If the short circuit of the generator occurs, the voltage drops rapidly, the undervoltage relay KV1 detects undervoltage, an output closed point activates the forced excitation relay K54, the R1R2 and the R3R4 of the K54 are normally closed to be normally open, the T1, the T2 and the T3 forced excitation currents of the forced excitation CT respectively enter the L1, the L2 and the L3 of the second three-phase rectifier bridge V02, and P and N are output after rectification. P of V02 to L2 of the first three-phase rectifier bridge V01, while the dc positive output of the voltage regulator F + to L1 of V01, from P of V01 to F + of terminal X1 to the generator exciter stator; n of V02 is output to F of terminal X1 to the exciter stator.
In this embodiment, the first resistor R1 is a linear resistor having a resistance range of 5 to 100 ohms, and preferably 100W 10 Ω in this embodiment.
In this embodiment, the first port 3, the second port 4, and the third port 5 of the voltage regulator are respectively connected to the secondary port of the power transformer T6 through the switching element KM 1.
In this embodiment, the fourth port E1, the fifth port E2 and the sixth port E3 of the voltage regulator are respectively connected to the secondary side port of the voltage transformer T5.
In this embodiment, the dc positive output terminal P of the second three-phase rectifier bridge V02 is connected to the second input terminal L2 of the first three-phase rectifier bridge, and the first input terminal L1 of the first three-phase rectifier bridge V01 is connected to the positive output terminal F + of the voltage regulator.
Further, the direct-current positive output end P of the first three-phase rectifier bridge V01 is connected with the positive end F + of the excitation power supply.
Further, a direct current positive output end P of the first three-phase rectifier bridge V01 is connected to a first end of the adjustable resistor, and a second end of the adjustable resistor R2 is connected to a direct current positive output end P of the third three-phase rectifier bridge.
Furthermore, the first input end L1 of the third three-phase rectifier bridge V03 is connected to a magnetizing switch, and the magnetizing switch is connected to an external magnetizing power supply. And a third input end L3 of the third three-phase rectifier bridge is connected with an external magnetizing power supply.
Furthermore, a negative output end F-of the voltage regulator BASLER DECS-150 is connected with a negative end F-of the excitation power supply, and a negative output end of the voltage regulator BASLER DECS-150 is connected with a direct current negative output end N of the third three-phase rectifier bridge.
The utility model discloses concatenate the normally open main contact of force excitation relay K54 at three-phase rectifier bridge V02 direct current negative pole output circuit to connect a linear resistance (100W 10 omega) at this main contact, linear resistance establishes ties in the main loop when the force excitation is out of work, concatenates with exciter stator winding in this linear resistance in other words, interference cancellation, the exciting current of AVR output and IGBT's duty cycle phase-match. When the forced excitation works, the forced excitation relay K54 acts, the normally open main contact is closed to short-circuit the linear resistor, the forced excitation loop works normally, and the AVR does not work at the moment and is not influenced by loop interference.
Meanwhile, in the prior art, a diode is only added at the anode of the parallel voltage, so that the effect of blocking the voltage output by the AVR and an external voltage loop is achieved, but the cathode is directly connected, and interference occurs. In the embodiment, diodes are added to the anode and the cathode of the parallel voltage, so that the external power supply is isolated from the AVR connection, and the interference is blocked in normal operation.
In this embodiment, KV1 is an undervoltage relay, which is used for voltage detection, and when the detected voltage is lower than a set value, the action is output to activate the forced excitation relay K54;
the circuit on the right side of the SM is an exciter, the exciter provides an excitation power supply for a generator rotor, and the F & lt + & gt and F & lt- & gt of the excitation module or the strong excitation output are connected to the exciter to provide the excitation power supply for the exciter;
the circuit on the left side of the magnetizing switch is externally connected with a power supply DC24V through a wiring terminal X1, the MC1 and the MC2 are AVR boards for collecting the current of the generator, the current comes from a generator current transformer T4, and 1.0BU represents a blue cable wire with the wire diameter of 1.0mm 2.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A generator excitation output de-excitation loop is characterized in that:
the method comprises the following steps: a first three-phase rectifier bridge and a voltage regulator; the positive output end of the first three-phase rectifier bridge is connected with the negative end of a third diode after passing through a first diode and a second diode in sequence, the negative end of the third diode is connected with the negative end of a fourth diode, and the negative end of the fourth diode is connected with the positive end of an excitation power supply;
the negative output end of the voltage regulator is connected with the positive end of the third diode, the positive end of the third diode is connected with the positive end of the fourth diode, and the positive end of the fourth diode is connected with the negative end of the excitation power supply.
2. The generator excitation output de-excitation circuit of claim 1, wherein:
the direct current negative output end of the second three-phase rectifier bridge is connected with the negative output end of the voltage regulator through a first normally open contact, and the first normally open contact is connected with a first resistor in parallel.
3. The generator excitation output de-excitation circuit of claim 1, wherein:
the first resistor is a linear resistor, and the resistance range is 5-100 ohms.
4. The generator excitation output de-excitation circuit of claim 1, wherein:
the first port, the second port and the third port of the voltage regulator are respectively connected with the secondary side port of the power transformer through the switching element.
5. The generator excitation output de-excitation circuit of claim 1, wherein:
and a fourth port, a fifth port and a sixth port of the voltage regulator are respectively connected with the secondary side port of the voltage transformer.
6. The generator excitation output de-excitation circuit of claim 1, wherein:
the direct current positive output end of the second three-phase rectifier bridge is connected with the second input end of the first three-phase rectifier bridge, and the first input end of the first three-phase rectifier bridge is connected with the positive output end of the voltage regulator.
7. The generator excitation output de-excitation circuit of claim 6, wherein:
and the direct-current positive output end of the first three-phase rectifier bridge is connected with the positive end of the excitation power supply.
8. The generator excitation output de-excitation circuit of claim 6, wherein:
the direct current positive output end of the first three-phase rectifier bridge is connected with the first end of the adjustable resistor, and the second end of the adjustable resistor is connected with the direct current positive output end of the third three-phase rectifier bridge;
the first input end of the third three-phase rectifier bridge is connected with the magnetizing switch, and the third input end of the third three-phase rectifier bridge is connected with an external magnetizing power supply.
9. The generator excitation output de-excitation circuit of claim 6, wherein:
and the negative output end of the voltage regulator is connected with the negative end of the excitation power supply, and the negative output end of the voltage regulator is connected with the direct-current negative output end of the third three-phase rectifier bridge.
10. A generator comprising a generator excitation output de-excitation circuit according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121042718.9U CN214799344U (en) | 2021-05-14 | 2021-05-14 | Excitation output de-excitation loop of generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121042718.9U CN214799344U (en) | 2021-05-14 | 2021-05-14 | Excitation output de-excitation loop of generator |
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| Publication Number | Publication Date |
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| CN214799344U true CN214799344U (en) | 2021-11-19 |
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| CN202121042718.9U Active CN214799344U (en) | 2021-05-14 | 2021-05-14 | Excitation output de-excitation loop of generator |
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2021
- 2021-05-14 CN CN202121042718.9U patent/CN214799344U/en active Active
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