CN113162495A - Anti-interference circuit and anti-interference method for excitation forced excitation of generator - Google Patents
Anti-interference circuit and anti-interference method for excitation forced excitation of generator Download PDFInfo
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- CN113162495A CN113162495A CN202110527999.5A CN202110527999A CN113162495A CN 113162495 A CN113162495 A CN 113162495A CN 202110527999 A CN202110527999 A CN 202110527999A CN 113162495 A CN113162495 A CN 113162495A
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- excitation
- rectifier bridge
- generator
- phase rectifier
- voltage regulator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/006—Means for protecting the generator by using control
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- Control Of Eletrric Generators (AREA)
Abstract
The invention provides a generator excitation forced excitation anti-interference circuit and an anti-interference method, which comprise a first three-phase rectifier bridge and a voltage regulator, wherein a direct-current negative output end of the first three-phase rectifier bridge is connected with a 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; when the forced excitation does not work, the first resistor is connected in series in the main loop, the first resistor is connected in series with the stator winding, and the exciting current output by the voltage regulator is matched with the duty ratio of the IGBT; when the forced excitation works, the first normally open contact is closed, the first resistor is in short circuit, the forced excitation loop works normally, and the voltage regulator does not work; the method and the device have the advantages that the working requirement of the forced excitation loop is met, meanwhile, the interference of the loop on AVR is eliminated, and the performance of the generator is improved.
Description
Technical Field
The disclosure relates to the technical field of power control, in particular to a generator excitation strong excitation anti-interference circuit and an anti-interference method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
An Automatic Voltage Regulator (AVR) is often connected to a conventional forced excitation control circuit.
The inventor finds that interference is generated on an Automatic Voltage Regulator (AVR) connected with a loop in the using process, the interference enables the exciting current output by the AVR to be not matched with the duty ratio calculated by an IGBT of a power unit, so that the control of a generator is unstable, meanwhile, the generated interference influences the transient characteristic of AVR adjustment, so that the voltage or reactive power control of the generator is unstable when the load suddenly changes, and the performance of the generator for bearing the sudden change of the load is greatly reduced.
Disclosure of Invention
In order to solve the defects of the prior art, the disclosure provides a generator excitation strong excitation anti-interference circuit and an anti-interference method, which can meet the working requirement of a strong excitation loop, eliminate the interference of the loop on AVR and improve the performance of a generator.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
the first aspect of the disclosure provides a generator excitation strong excitation anti-interference circuit.
The utility model provides a generator excitation intense excitation jam-proof circuit, includes first three-phase rectifier bridge and voltage regulator, is connected through first normally open contact between the negative output of direct current negative pole output of first three-phase rectifier bridge and the negative output of voltage regulator, and first normally open contact connects in parallel has first resistance.
As an alternative embodiment, the first resistor is a linear resistor, and the resistance range is 5 ohms to 100 ohms.
As an alternative embodiment, 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.
In an alternative embodiment, the fourth port, the fifth port and the sixth port of the voltage regulator are respectively connected with the secondary side port of the voltage transformer.
In an alternative embodiment, the dc positive output terminal of the first three-phase rectifier bridge is connected to the second input terminal of the second three-phase rectifier bridge, and the first input terminal of the second three-phase rectifier bridge is connected to the positive output terminal of the voltage regulator.
Further, the direct-current positive output end of the second three-phase rectifier bridge is connected with the positive end of the excitation power supply.
Furthermore, the direct current positive output end of the second 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.
Furthermore, 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 second aspect of the present disclosure provides a method for preventing interference during excitation forced excitation of a generator, which utilizes the circuit for preventing interference during excitation forced excitation of a generator according to the first aspect of the present disclosure;
when the forced excitation does not work, the first resistor is connected in series in the main loop, the first resistor is connected in series with the stator winding, and the exciting current output by the voltage regulator is matched with the duty ratio of the IGBT;
when the forced excitation works, the first normally open contact is closed, the first resistor is in short circuit, the forced excitation loop works normally, and the voltage regulator does not work.
The third aspect of the present disclosure provides a generator, including the generator excitation strong excitation anti-interference circuit according to the first aspect of the present disclosure.
Compared with the prior art, the beneficial effect of this disclosure is:
1. the circuit or the method not only ensures the normal operation of the forced excitation function during the forced excitation work, but also ensures that the AVR is not interfered during the non-forced excitation work.
2. According to the circuit or the method, the rectifier bridge diodes are additionally arranged on the anode and the cathode of the parallel voltage, so that the external power supply is isolated from the AVR connection, the interference is blocked in normal operation, and the stability of the system is improved.
Advantages of additional aspects of the disclosure 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 disclosure.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic diagram of a generator excitation strong excitation anti-interference circuit provided in embodiment 1 of the present disclosure.
Fig. 2 is a schematic diagram of a generator excitation strong excitation anti-interference circuit provided in embodiment 2 of the present disclosure.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 disclosure 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 according to the present disclosure. 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.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
Example 1:
as shown in fig. 1, an embodiment 1 of the present disclosure provides a generator excitation strong excitation anti-interference circuit, which includes a first three-phase rectifier bridge VO1 and a voltage regulator BASLER DECS-150, a dc negative output terminal N of the first three-phase rectifier bridge VO1 is connected to a negative output terminal F-of the voltage regulator through a first normally open contact K54, and the first normally open contact is connected in parallel to a first resistor R1.
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 in short circuit with the normally closed contacts of R1, R2, R3 and R4 of the forced excitation relay from a wiring terminal X1 to a terminal K54, and the forced excitation does not work at the moment.
If the generator is in short circuit, the voltage drops rapidly, the KV1 (undervoltage relay) detects undervoltage, an output closed point activates a K54 forced excitation relay, R1R2 and R3R4 of K54 are normally closed to normally open, T1, T2 and T3 forced excitation currents of the forced excitation CT respectively enter L1, L2 and L3 of a first three-phase rectifier bridge V01, and P and N are output after rectification. P of V01 to L2 of the second three-phase rectifier bridge V02, while the dc positive output of the voltage regulator F + to L1 of V02, from P of V02 to F + of terminal X1 to the generator exciter stator; n of V01 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 first three-phase rectifier bridge VO1 is connected to the second input terminal L2 of the second three-phase rectifier bridge, and the first input terminal L1 of the second three-phase rectifier bridge is connected to the positive output terminal F + of the voltage regulator.
Further, a direct-current positive output end P of the second three-phase rectifier bridge VO2 is connected with a positive end F + of the excitation power supply.
Further, a direct current positive output end P of the second three-phase rectifier bridge VO2 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 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.
According to the electromagnetic excitation circuit, a normally open main contact of a K54 (strong excitation relay) is connected in series with a direct-current negative output circuit of a three-phase rectifier bridge V01, a linear resistor (100W 10 omega) is connected in parallel with the main contact, the linear resistor is connected in series in the main circuit when strong excitation does not work, the linear resistor is connected in series with an exciter stator winding equivalently, interference is eliminated, and exciting current output by an AVR is matched with the duty ratio of an IGBT. When the strong excitation circuit works, the K54 (strong excitation relay) acts, the normally open main contact is closed to short the linear resistor, the strong excitation circuit works normally, and the AVR does not work at the moment and is not influenced by the interference of the circuit.
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.
Example 2:
the embodiment 2 of the present disclosure provides a generator excitation forced excitation anti-interference circuit, as shown in fig. 2, a positive output end of a second three-phase rectifier bridge V02 is connected to a negative end of a third diode D03 after passing through a first diode D01 and a second diode D02 in sequence, a negative end of the third diode D03 is connected to a negative end of a fourth diode D04, and a negative end of the fourth diode D04 is connected to a negative end F-of an excitation power supply;
the negative output end F-of the voltage regulator BASLER DECS-150 is connected with the positive end of a third diode D03, the positive end of a third diode D03 is connected with the positive end of a fourth diode D04, and the positive end of a fourth diode D04 is connected with the positive end F + of the excitation power supply.
Other connection relations are the same as those in embodiment 1, and are not repeated here, so that through-current capacity of the excitation output demagnetization circuit is greatly improved, stability in demagnetization is guaranteed, a freewheeling diode in the AVR is protected, and reliability of the whole excitation system is improved.
Example 3:
the embodiment 3 of the present disclosure provides a generator, where the generator includes the excitation strong excitation anti-interference circuit described in the embodiment 1 or 2 of the present disclosure.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A generator excitation strong excitation anti-interference circuit is characterized in that:
the direct current negative output end of the first 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.
2. The excitation strong excitation anti-interference circuit of the generator according to claim 1, wherein:
the first resistor is a linear resistor, and the resistance range is 5-100 ohms.
3. The excitation strong excitation anti-interference circuit of the generator according to 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.
4. The excitation strong excitation anti-interference circuit of the generator according to 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.
5. The excitation strong excitation anti-interference circuit of the generator according to claim 1, wherein:
the direct current positive output end of the first three-phase rectifier bridge is connected with the second input end of the second three-phase rectifier bridge, and the first input end of the second three-phase rectifier bridge is connected with the positive output end of the voltage regulator.
6. The excitation strong excitation anti-interference circuit of the generator according to claim 5, wherein:
and the direct-current positive output end of the second three-phase rectifier bridge is connected with the positive end of the excitation power supply.
7. The excitation strong excitation anti-interference circuit of the generator according to claim 5, wherein:
the direct-current positive output end of the second 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.
8. The excitation strong excitation anti-interference circuit of the generator according to claim 5, 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.
9. A method for preventing interference of generator excitation forced excitation is characterized in that: utilizing the generator excitation forced excitation anti-interference circuit of any one of claims 1-8;
when the forced excitation does not work, the first resistor is connected in series in the main loop, the first resistor is connected in series with the stator winding, and the exciting current output by the voltage regulator is matched with the duty ratio of the IGBT;
when the forced excitation works, the first normally open contact is closed, the first resistor is in short circuit, the forced excitation loop works normally, and the voltage regulator does not work.
10. A generator comprising a generator excitation strong-excitation anti-interference circuit according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110527999.5A CN113162495B (en) | 2021-05-14 | 2021-05-14 | Anti-interference circuit and anti-interference method for excitation forced excitation of generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110527999.5A CN113162495B (en) | 2021-05-14 | 2021-05-14 | Anti-interference circuit and anti-interference method for excitation forced excitation of generator |
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| CN113162495B CN113162495B (en) | 2022-05-03 |
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