CN112952784A - Excitation becomes overload limiter suitable for flexible excitation system - Google Patents
Excitation becomes overload limiter suitable for flexible excitation system Download PDFInfo
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- CN112952784A CN112952784A CN202110210127.6A CN202110210127A CN112952784A CN 112952784 A CN112952784 A CN 112952784A CN 202110210127 A CN202110210127 A CN 202110210127A CN 112952784 A CN112952784 A CN 112952784A
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- 230000005284 excitation Effects 0.000 title claims abstract description 231
- 230000008859 change Effects 0.000 claims abstract description 84
- 230000000670 limiting effect Effects 0.000 claims abstract description 39
- 230000009471 action Effects 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims abstract description 3
- 230000002457 bidirectional effect Effects 0.000 claims description 26
- 238000004804 winding Methods 0.000 claims description 11
- 238000013021 overheating Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Abstract
The invention discloses an excitation-to-overload limiter suitable for a flexible excitation system. The excitation-to-overload limiter comprises an excitation-to-overload signal detection circuit, an excitation-to-overload state judgment circuit and an excitation-to-overload action circuit; the excitation change overload signal detection circuit is used for detecting a signal of the load operation state of the excitation transformer and transmitting the signal to the excitation change overload state judgment circuit; the excitation change overload state judgment loop calculates and judges whether the excitation transformer exceeds the overload operation state allowed by the equipment by using the detected signal to obtain an excitation change overload limiting action signal and transmits the excitation change overload limiting action signal to the excitation change overload action loop; the excitation change overload action loop controls the control process variable of the flexible excitation system. The invention can limit the running state of the excitation transformer within the overload running range allowed by the equipment while exerting the strong excitation capability of the flexible excitation system.
Description
Technical Field
The invention belongs to the field of generator excitation systems, and particularly relates to an excitation-to-overload limiter suitable for a flexible excitation system.
Background
In recent years, a power grid faces the development challenge of 'double high' of a high proportion of clean energy and a high proportion of power electronic devices, the safe and stable operation pressure is greatly increased, and the elastic regulation capacity of the power system for dealing with extreme risks under new situations is urgently needed to be improved. After the conventional generator set is replaced by a large amount of new energy, the stable supporting capability of the power grid is reduced, the operation risk of the power grid is increased, and the control means are deficient. The problems are solved, if the measure cost is high and the difficulty is high in one-time system, if the measure can be realized by improving the excitation control system and the control strategy of the large synchronous generator, the effect is more obvious, and the cost is greatly reduced.
At present, a conventional generator excitation system is realized based on a thyristor rectification mode of a half-control device, and only the device can be controlled to be switched on and switched off, so that the conventional excitation system can only control the excitation voltage of a generator through phase-controlled step-down rectification, and when the voltage of a power grid drops, the top value forced excitation output capacity of a generator set is limited, and the voltage stability control of a high-proportion new energy power grid is not facilitated. The flexible excitation device is characterized in that a topological structure and a control method are innovated by applying a full-control power electronic device IGBT, and the essential improvement of the performance of a generator excitation system, which relates to the stable control of a power grid, is realized from the bottom layer.
However, when the flexible excitation device composed of the AC-DC and DC-DC power conversion loops based on the IGBT element is applied to a power generation excitation system, the existing limit control function of the conventional excitation cannot completely cover the safe operation requirement of the new topology excitation system because the flexible excitation has the active enhancement strong excitation capability. In the strong excitation state of the excitation system, the conventional excitation can only be controlled by voltage reduction and rectification, and the alternating current of the excitation transformer and the direct current of the rotor side are almost in linear direct proportion, so that the overload problem of the excitation transformer can be equivalently limited only by the rotor over-excitation limiter. However, the soft excitation has a boosting and forced excitation function, the excitation variable current is inversely proportional to the machine end voltage in the forced excitation state, and the excitation variable current and the rotor current are not maintained in a linear proportional relation, so that the overload operation state of the excitation transformer cannot be limited and protected by using the original over-excitation limiter.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the defects in the prior art, and provide an excitation-to-overload limiter suitable for a flexible excitation system, which limits the operating state of an excitation transformer within an overload operating range allowed by a device while exerting the dynamic strong excitation capability of the flexible excitation system.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the excitation becomes overload limiter suitable for a flexible excitation system, wherein the flexible excitation system comprises a flexible excitation power unit and a flexible excitation control unit;
the flexible excitation power unit comprises a two-stage circuit of a front-stage bidirectional alternating current-direct current converter and a rear-stage bidirectional direct current-direct current converter, wherein the front-stage bidirectional alternating current-direct current converter is connected with the rear-stage bidirectional direct current-direct current converter through an intermediate direct current capacitor loop; the three-phase alternating current input side of the preceding-stage bidirectional alternating current-direct current converter is the input side of the flexible excitation power unit; the direct current output side of the rear-stage bidirectional direct current-direct current converter is the output side of the flexible excitation power unit; the input side of the flexible excitation power unit is connected with the three-phase alternating current low-voltage side of the excitation transformer, and the three-phase alternating current high-voltage side of the excitation transformer is connected with the generator end; the output side of the flexible excitation power unit is connected with an excitation winding of the generator;
the flexible excitation control unit comprises an excitation change overload limiter, and the excitation change overload limiter comprises an excitation change overload signal detection circuit, an excitation change overload state judgment circuit and an excitation change overload action circuit; the excitation change overload signal detection circuit is used for detecting a signal of the load operation state of the excitation transformer and transmitting the signal to the excitation change overload state judgment circuit; the excitation change overload state judgment loop calculates and judges whether the excitation change exceeds the overload operation state allowed by the equipment by using the detected signal to obtain an excitation change overload limiting action signal and transmits the excitation change overload limiting action signal to the excitation change overload action loop; after the excitation change overload action loop receives the excitation change overload limiting action signal, the operation state of the excitation transformer is limited within the overload operation range allowed by the equipment by controlling the control process variable of the flexible excitation system.
The excitation change overload refers to that the excitation change is operated beyond a rated load, and the excitation change overload operation range can be characterized by an operation current and a corresponding allowed operation time, wherein the operation current and the allowed operation time generally show inverse time limit characteristics, and can also be characterized by the maximum allowed operation temperature of the excitation change.
Further, the excitation transformer overload signal detection loop obtains the temperature of the excitation transformer through a temperature measuring device; and the excitation change overload state judgment loop obtains an excitation change overload limiting action signal by comparing the temperature of the excitation transformer with the overheating fixed value of the temperature of the excitation transformer.
Further, the excitation change overload signal detection loop obtains the current of the excitation transformer through a current measuring device; the excitation change overload state judgment loop calculates the accumulated heat of the excitation change winding through the current of the excitation transformer, and compares the accumulated heat with the fixed value of the overload heat of the excitation change winding to obtain an excitation change overload limiting action signal.
Further, when the excitation change overload limiting action signal occurs, the excitation change overload action loop acts to reduce the output amplitude limit of the excitation voltage of the post-stage bidirectional direct current-direct current converter, and is adjusted in real time according to the following formula: the excitation voltage output amplitude limit = a limiting action conservative coefficient x a unit terminal voltage value x an excitation variable secondary side rated voltage x an excitation variable secondary side rated current ÷ an excitation current measured value.
Further, when the excitation change overload limiting action signal is generated, the excitation change overload action loop acts to reduce the current amplitude limit of the input link of the preceding-stage bidirectional AC-DC converter, and is limited according to the following formula: the current limiting = limiting action conservative coefficient x exciting transformer secondary side rated current.
The invention has the following beneficial effects: the excitation-to-overload limiter provided by the invention can fully exert the high strong excitation capability of the flexible excitation system, and simultaneously limit the running state of the excitation transformer within the overload running range allowed by equipment, thereby overcoming the defect of the existing excitation limit control and effectively protecting the excitation transformer.
Drawings
Fig. 1 is a control block diagram of an excitation-to-overload limiter suitable for a flexible excitation system according to an embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the following examples and the accompanying drawings, but the scope of the invention is not limited to the following examples. Any modification and variation made within the spirit of the present invention and the scope of the claims fall within the scope of the present invention.
Example 1
As shown in fig. 1, an excitation change overload limiter applied to a flexible excitation system according to the present embodiment includes a flexible excitation power unit and a flexible excitation control unit.
The flexible excitation power unit comprises a two-stage circuit of a front-stage bidirectional alternating current-direct current converter and a rear-stage bidirectional direct current-direct current converter, wherein the front-stage bidirectional alternating current-direct current converter is connected with the rear-stage bidirectional direct current-direct current converter through an intermediate direct current capacitor loop; the three-phase alternating current input side of the preceding-stage bidirectional alternating current-direct current converter is the input side of the flexible excitation power unit; the direct current output side of the rear-stage bidirectional direct current-direct current converter is the output side of the flexible excitation power unit; the input side of the flexible excitation power unit is connected with the three-phase alternating current low-voltage side of the excitation transformer, and the three-phase alternating current high-voltage side of the excitation transformer is connected with the generator end; and the output side of the flexible excitation power unit is connected with an excitation winding of the generator.
The flexible excitation control unit comprises an excitation variable overload limiter and controls the excitation variable current to be limited within the overload operation range allowed by the equipment;
the excitation-to-overload limiter consists of an excitation-to-overload signal detection circuit, an excitation-to-overload state judgment circuit and an excitation-to-overload action circuit;
the excitation change overload signal detection loop obtains the temperature of the excitation transformer through a temperature measuring device; and the excitation change overload state judgment loop obtains an excitation change overload limiting action signal by comparing the temperature of the excitation transformer with the overheating fixed value of the temperature of the excitation transformer.
When the excitation-to-overload limiting action signal occurs, the excitation-to-overload action loop acts to reduce the excitation voltage output amplitude limit of the rear-stage bidirectional DC-DC converter, and is adjusted in real time according to the following formula: the excitation voltage output amplitude limit = a limiting action conservative coefficient x a unit end voltage per unit value x an excitation variable secondary side rated voltage x an excitation variable secondary side rated current ÷ an excitation current measured value, wherein the limiting action conservative coefficient can be set according to 0.8 to 0.9.
Example 2
The control block diagram of an excitation change overload limiter applied to a flexible excitation system proposed in the present embodiment is the same as that of example 1, as shown in fig. 1.
The excitation-to-overload limiter consists of an excitation-to-overload signal detection circuit, an excitation-to-overload state judgment circuit and an excitation-to-overload action circuit;
the excitation change overload signal detection loop obtains the temperature of the excitation transformer through a temperature measuring device; and the excitation change overload state judgment loop obtains an excitation change overload limiting action signal by comparing the temperature of the excitation transformer with the overheating fixed value of the temperature of the excitation transformer.
When the excitation becomes the overload restriction action signal, the excitation becomes the overload action return circuit and also can act on reducing the current amplitude limit of the preceding stage bidirectional AC-DC converter input link, and the restriction is carried out according to the following formula: the three-phase alternating current input current limiting = limiting action conservative coefficient x exciting transformer secondary side rated current, wherein the limiting action conservative coefficient can be set according to 0.8-0.9.
Example 3
The control block diagram of an excitation change overload limiter applied to a flexible excitation system proposed in the present embodiment is the same as that of example 1, as shown in fig. 1.
The excitation-to-overload limiter consists of an excitation-to-overload signal detection circuit, an excitation-to-overload state judgment circuit and an excitation-to-overload action circuit;
the excitation change overload signal detection loop obtains the current of the excitation transformer through a current measuring device; and the excitation change overload state judgment loop calculates the accumulated heat of the excitation change winding through the current of the excitation transformer and compares the accumulated heat with the excitation change winding overload heat fixed value to obtain an excitation change overload limiting action signal.
When the excitation-to-overload limiting action signal occurs, the excitation-to-overload action loop acts to reduce the excitation voltage output amplitude limit of the rear-stage bidirectional DC-DC converter, and is adjusted in real time according to the following formula: the excitation voltage output amplitude limit = a limiting action conservative coefficient x a unit end voltage per unit value x an excitation variable secondary side rated voltage x an excitation variable secondary side rated current ÷ an excitation current measured value, wherein the limiting action conservative coefficient can be set according to 0.8 to 0.9.
Example 4
The control block diagram of an excitation change overload limiter applied to a flexible excitation system proposed in the present embodiment is the same as that of example 1, as shown in fig. 1.
The excitation-to-overload limiter consists of an excitation-to-overload signal detection circuit, an excitation-to-overload state judgment circuit and an excitation-to-overload action circuit;
the excitation change overload signal detection loop obtains the current of the excitation transformer through a current measuring device; and the excitation change overload state judgment loop calculates the accumulated heat of the excitation change winding through the excitation change current and compares the accumulated heat with the excitation change winding overload heat fixed value to obtain an excitation change overload limiting action signal.
When the excitation-to-overload limiting action signal occurs, the excitation-to-overload action loop can act to reduce the current amplitude limit of the input link of the preceding-stage bidirectional AC-DC converter, and is limited according to the following formula: the three-phase alternating current input current limiting = limiting action conservative coefficient x exciting transformer secondary side rated current, wherein the limiting action conservative coefficient can be set according to 0.8-0.9.
Claims (5)
1. The excitation becomes overload limiter suitable for a flexible excitation system, and is characterized in that the flexible excitation system comprises a flexible excitation power unit and a flexible excitation control unit;
the flexible excitation power unit comprises a two-stage circuit of a front-stage bidirectional alternating current-direct current converter and a rear-stage bidirectional direct current-direct current converter, wherein the front-stage bidirectional alternating current-direct current converter is connected with the rear-stage bidirectional direct current-direct current converter through an intermediate direct current capacitor loop; the three-phase alternating current input side of the preceding-stage bidirectional alternating current-direct current converter is the input side of the flexible excitation power unit; the direct current output side of the rear-stage bidirectional direct current-direct current converter is the output side of the flexible excitation power unit; the input side of the flexible excitation power unit is connected with the three-phase alternating current low-voltage side of the excitation transformer, and the three-phase alternating current high-voltage side of the excitation transformer is connected with the generator end; the output side of the flexible excitation power unit is connected with an excitation winding of the generator;
the flexible excitation control unit comprises an excitation change overload limiter, and the excitation change overload limiter comprises an excitation change overload signal detection circuit, an excitation change overload state judgment circuit and an excitation change overload action circuit; the excitation change overload signal detection circuit is used for detecting a signal of the load operation state of the excitation transformer and transmitting the signal to the excitation change overload state judgment circuit; the excitation change overload state judgment loop calculates and judges whether the excitation change exceeds the overload operation state allowed by the equipment by using the detected signal to obtain an excitation change overload limiting action signal and transmits the excitation change overload limiting action signal to the excitation change overload action loop; after the excitation change overload action loop receives the excitation change overload limiting action signal, the operation state of the excitation transformer is limited within the overload operation range allowed by the equipment by controlling the control process variable of the flexible excitation system.
2. An excitation change overload limiter for a soft excitation system according to claim 1,
the excitation change overload signal detection loop obtains the temperature of the excitation transformer through a temperature measuring device; and the excitation change overload state judgment loop obtains an excitation change overload limiting action signal by comparing the temperature of the excitation transformer with the overheating fixed value of the temperature of the excitation transformer.
3. An excitation change overload limiter for a soft excitation system according to claim 1,
the excitation change overload signal detection loop obtains the current of the excitation transformer through a current measuring device; the excitation change overload state judgment loop calculates the accumulated heat of the excitation change winding through the current of the excitation transformer, and compares the accumulated heat with the fixed value of the overload heat of the excitation change winding to obtain an excitation change overload limiting action signal.
4. An excitation change overload limiter suitable for a flexible excitation system according to claim 1, 2 or 3, wherein when the excitation change overload limiting action signal occurs, the excitation change overload action loop acts to reduce the excitation voltage output amplitude limit of the post-stage bidirectional dc-dc converter and real-time adjusts according to the following formula: the excitation voltage output amplitude limit = a limiting action conservative coefficient x a unit terminal voltage value x an excitation variable secondary side rated voltage x an excitation variable secondary side rated current ÷ an excitation current measured value.
5. An excitation transformer overload limiter suitable for a flexible excitation system according to claim 1, 2 or 3, wherein when the excitation transformer overload limiting action signal occurs, the excitation transformer overload action loop acts to reduce the current amplitude limit of the input link of the preceding bidirectional ac-dc converter, and the limitation is performed according to the following formula: the current limiting = limiting action conservative coefficient x exciting transformer secondary side rated current.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110210127.6A CN112952784A (en) | 2021-02-24 | 2021-02-24 | Excitation becomes overload limiter suitable for flexible excitation system |
| PCT/CN2021/078062 WO2021170074A1 (en) | 2020-02-26 | 2021-02-26 | Flexible excitation system and control method therefor |
| US17/896,714 US20220407316A1 (en) | 2020-02-26 | 2022-08-26 | Flexible excitation system and control method therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110210127.6A CN112952784A (en) | 2021-02-24 | 2021-02-24 | Excitation becomes overload limiter suitable for flexible excitation system |
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| CN112952784A true CN112952784A (en) | 2021-06-11 |
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