CN108494013B - Start-up protection configuration method based on protected object - Google Patents
Start-up protection configuration method based on protected object Download PDFInfo
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- CN108494013B CN108494013B CN201810109215.5A CN201810109215A CN108494013B CN 108494013 B CN108494013 B CN 108494013B CN 201810109215 A CN201810109215 A CN 201810109215A CN 108494013 B CN108494013 B CN 108494013B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- Control Of Eletrric Generators (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
The invention discloses a startup protection configuration method based on a protected object, which comprises the following steps: for a generator transformer bank, dividing the generator transformer bank into a generator, a main transformer, a service transformer and an excitation transformer according to protected objects, and respectively configuring starting main protection for each protected object, wherein the starting main protection comprises starting differential protection; the phase modulation transformer bank is divided into a phase modulation machine, a main transformer and an excitation transformer according to protected objects, starting main protection is configured for each unprotected object respectively, and the starting main protection comprises starting differential protection. The invention also comprises the configuration of starting overcurrent protection and starting zero sequence voltage protection. In the starting stage, faults occur in any protected object range, the faults can be identified in two electrical cycle times, the faults can be removed quickly, and the safety of equipment and a power grid is further ensured.
Description
Technical Field
The invention relates to a startup protection configuration method based on a protected object, and belongs to the technical field of relay protection of power systems.
Background
The starting process of the generator and the phase modifier is a frequency-boosting and voltage-boosting process, the frequency is not close to the power grid frequency of 50Hz in most of time, protection based on a power frequency algorithm is not effective in most of time in the starting process, and therefore starting protection is needed in the starting process.
The starting mode of the generator/phase modulator has diversity, the frequency of the starting process is increased by a prime motor, and the frequency of the starting process is increased by injecting currents with different frequencies through a Static Frequency Converter (SFC). By the starting mode of the static frequency converter, the current constant value of the backup protection cannot be set to be small due to the existence of the injected current, so the protection range of the backup protection is certainly limited.
The start-up protection of the current generator/phase modulator protection equipment manufacturer is only provided with start-up differential protection and start-up overcurrent protection of the generator/phase modulator, when a fault point occurs in a main transformer or an excitation transformer, the action speed is slow only through start-up overcurrent protection delay action, and the start-up overcurrent protection even can not act due to insufficient sensitivity protection, so that the protection is finally refused to act.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a starting protection configuration method based on a protected object, and solves the technical problems of slow starting protection action, insufficient sensitivity and protection refusal in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the start-up protection configuration method based on the protected object comprises the following steps:
for a generator transformer bank, dividing the generator transformer bank into a generator, a main transformer, a service transformer and an excitation transformer according to protected objects, and respectively configuring starting main protection for each protected object, wherein the starting main protection comprises starting differential protection;
the phase modulation transformer bank is divided into a phase modulation machine, a main transformer and an excitation transformer according to protected objects, and starter main protection is configured for each protected object respectively, wherein the starter main protection comprises starter differential protection.
The differential protection action of starting the protected object should satisfy the conditions (1) and (2) and simultaneously satisfy any one of the three conditions (3), (4) and (5):
(1) the starting differential current element action condition is met, namely, the starting differential current of any phase of the protected object is greater than or equal to the starting differential current setting value;
(2) the grid-connected condition is not met;
(3) the input of the start-up protection is opened through a low-voltage element, when the grid-connected condition is not met and the time delay requirement is smaller than the low-voltage condition, the low-voltage condition enables the start-up protection to be input, wherein: the value range of the low voltage set value is as follows: 0.3 Un-0.8 Un;
(4) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met and the terminal voltage is less than the terminal voltage set value, the low-frequency condition enables the start-up protection to be input, wherein: the value range of the set value of the terminal voltage is as follows: 0.1 Un-0.5 Un;
(5) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met, the terminal voltage is greater than or equal to the terminal voltage set value, and the frequency is smaller than the frequency set value, the start-up protection is input through the low-frequency condition, wherein: the value range of the frequency set value is as follows: 0.85fn～0.98fn；
Wherein: un represents the terminal rated voltage; f. ofnRepresenting the nominal frequency of the system.
The calculation method of the start-up differential current comprises the following steps: and connecting a current transformer to each terminal of the protected object, and calculating the starting differential current of the protected object by adopting a frequency-independent algorithm.
The method for calculating the starting differential current setting value comprises the following steps: and calculating a starting differential current setting value according to the transmission error of the current transformer which is kept away and multiplied by a reliable coefficient.
When the protected object is a main transformer, the start-up main protection also comprises main transformer start-up current quick-break protection.
The main transformer start-up current quick-break protection action needs to satisfy the conditions (1) and (2) and simultaneously satisfy any one of the three conditions (3), (4) and (5):
(1) the operating condition of a quick-break element of the starting current is met, namely the current of any phase of the low-voltage side of the main transformer is greater than or equal to the setting value of the quick-break current of the starting current;
(2) the grid-connected condition is not met;
(3) the input of the start-up protection is opened through a low-voltage element, when the grid-connected condition is not met and the time delay requirement is smaller than the low-voltage condition, the low-voltage condition enables the start-up protection to be input, wherein: the value range of the low voltage set value is as follows: 0.3 Un-0.8 Un;
(4) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met and the terminal voltage is less than the terminal voltage set value, the low-frequency condition enables the start-up protection to be input, wherein: the value range of the set value of the terminal voltage is as follows: 0.1 Un-0.5 Un;
(5) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met, the terminal voltage is greater than or equal to the terminal voltage set value, and the frequency is smaller than the frequency set value, the start-up protection is input through the low-frequency condition, wherein: the value range of the frequency set value is as follows: 0.85fn～0.98fn；
Wherein: un represents the terminal rated voltage; f. ofnRepresenting the nominal frequency of the system.
The starting protection configuration method further comprises the step of configuring starting backup protection, including starting overcurrent protection and starting zero sequence voltage protection.
The start-up overcurrent protection action needs to satisfy the conditions (1) and (2) and simultaneously satisfy any one of the three conditions (3), (4) and (5):
(1) the starting overcurrent element action condition is met, namely, any phase current in the three-phase current at the neutral point side is greater than or equal to the starting overcurrent setting value;
(2) the grid-connected condition is not met;
(3) the input of the start-up protection is opened through a low-voltage element, when the grid-connected condition is not met and the time delay requirement is smaller than the low-voltage condition, the low-voltage condition enables the start-up protection to be input, wherein: the value range of the low voltage set value is as follows: 0.3 Un-0.8 Un;
(4) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met and the terminal voltage is less than the terminal voltage set value, the low-frequency condition enables the start-up protection to be input, wherein: the value range of the set value of the terminal voltage is as follows: 0.1 Un-0.5 Un;
(5) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met, the terminal voltage is greater than or equal to the terminal voltage set value, and the frequency is smaller than the frequency set value, the start-up protection is input through the low-frequency condition, wherein: the value range of the frequency set value is as follows: 0.85fn～0.98fn；
Wherein: un represents the terminal rated voltage; f. ofnRepresenting the nominal frequency of the system.
The starting zero sequence voltage protection action needs to meet the conditions (1) and (2) and simultaneously meet any one of the three conditions (3), (4) and (5):
(1) the zero-sequence overvoltage element action condition of starting is met, namely the zero-sequence voltage on the neutral point side or the triangular zero-sequence voltage at the opening of the machine end is greater than or equal to the zero-sequence voltage setting value of starting;
(2) the grid-connected condition is not met;
(3) the input of the start-up protection is opened through a low-voltage element, when the grid-connected condition is not met and the time delay requirement is smaller than the low-voltage condition, the low-voltage condition enables the start-up protection to be input, wherein: the value range of the low voltage set value is as follows: 0.3 Un-0.8 Un;
(4) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met and the terminal voltage is less than the terminal voltage set value, the low-frequency condition enables the start-up protection to be input, wherein: the value range of the set value of the terminal voltage is as follows: 0.1 Un-0.5 Un;
(5) the start-up protection is opened through a low-frequency element, the grid-connected condition is not met, the terminal voltage is greater than or equal to the terminal voltage set value, and the frequency is less than the frequencyAt a fixed value, a low frequency condition enables a start-up protection to be put into operation, wherein: the value range of the frequency set value is as follows: 0.85fn～0.98fn；
Wherein: un represents the terminal rated voltage; f. ofnRepresenting the nominal frequency of the system.
The grid-connected condition is as follows:
the grid-connected switch state is in the on position or the grid-connected switch current is in the current condition within the set time range, wherein the value range of the set time is as follows: 0.01 second to 10 seconds.
Compared with the prior art, the invention has the following beneficial effects: in the starting stage, faults occur in any protected object range, the faults can be identified in two electrical cycle times, the faults can be removed rapidly, and the safety of equipment and a power grid is further ensured.
Drawings
FIG. 1 is a diagram of a generator transformer bank protection configuration;
FIG. 2 is a diagram of a phase modulator transformer bank protection arrangement;
FIG. 3 is a logic diagram of the differential protection operation of n starting up the protected object;
FIG. 4 is a logic diagram of the protected object n starting the quick current break protection operation;
FIG. 5 is a schematic diagram of a generator transformer bank/phase modifier transformer bank failure point;
FIG. 6 is a logic diagram of the start-up over-current protection action of the generator/phase modulator;
fig. 7 is a logic diagram of the zero sequence overvoltage protection action of the starting of the generator/phase modulator.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The invention comprehensively utilizes each protected object of a generator transformer bank and a phase regulator transformer bank and requires the reliable exit of the startup protection after the grid connection, and provides a startup protection configuration method based on the protected object, which specifically comprises the following steps: as shown in fig. 1, for the generator transformer bank, generator start differential protection, main transformer start differential protection and/or main transformer start current quick-break protection, plant transformer start differential protection, excitation transformer start differential protection are respectively configured for the generator, the main transformer, the plant transformer and the excitation transformer according to the protected objects, and start backup protection including start overcurrent protection and start zero sequence voltage protection is also configured. As shown in fig. 2, for the phase modulation transformer set, phase modulation start differential protection, main transformer start differential protection, or main transformer start current quick-break protection, excitation transformer start differential protection are respectively configured for the phase modulation transformer set, the main transformer and the excitation transformer according to the protected objects, and start backup protection, including start overcurrent protection and start zero sequence voltage protection, is configured at the same time.
The invention requires that each terminal of the protected object is connected with a current transformer, and the differential current of the starting machine is calculated by adopting an algorithm irrelevant to the frequency according to the current value acquired by the current transformer. The starting differential current setting value is calculated according to a transmission error which avoids a current transformer and is multiplied by a reliable coefficient, so that the starting differential current setting value can be set relatively low. In order to reduce the risk of misoperation of main protection and backup protection after grid connection, the startup protection needs to be reliably quitted before grid connection, the grid connection condition is that the grid connection switch state is in an on position or that the grid connection switch current is in a long-time (the time can be set to be 0.01-10 seconds) current condition, and the disconnection (non-grid connection) condition is that the grid connection switch state is in an off position and the grid connection switch current meets a no-current condition.
As shown in fig. 3, in order to start the protected object n, the protected object n should start the differential protection operation to satisfy the conditions (1) and (2) and simultaneously satisfy any one of the three conditions (3), (4), and (5):
(1) the starting differential current element action condition is met, namely, the starting differential current of any phase of the protected object is greater than or equal to the starting differential current setting value;
(2) the grid-connected condition is not met;
(3) the input of the start-up protection is opened through a low-voltage element, when the grid-connected condition is not met and the time delay requirement is smaller than the low-voltage condition, the low-voltage condition enables the start-up protection to be input, wherein: the value range of the low voltage set value is as follows: 0.3 Un-0.8 Un;
(4) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met and the terminal voltage is less than the terminal voltage set value, the low-frequency condition enables the start-up protection to be input, wherein: the value range of the set value of the terminal voltage is as follows: 0.1 Un-0.5 Un;
(5) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met, the terminal voltage is greater than or equal to the terminal voltage set value, and the frequency is smaller than the frequency set value, the start-up protection is input through the low-frequency condition, wherein: the value range of the frequency set value is as follows: 0.85fn～0.98fn；
Wherein: un represents the terminal rated voltage; f. ofnRepresenting the nominal frequency of the system.
When the protected object is a main transformer, the starting main protection comprises the main transformer starting main protection and/or the main transformer starting current quick-break protection. Because the main transformer high-voltage side current automatically judges as being connected to the grid when meeting the current condition, and locks all start-up protection at the moment, the start-up main protection of the main transformer has two realization modes: the first method is as follows: the condition that the starting differential current is greater than or equal to the starting differential current setting value criterion is met, and no current flows at the high-voltage side, so that starting differential protection is realized; the second method comprises the following steps: the current at the low-voltage side is larger than the quick-break current of the starting machine, and the quick-break protection of the starting machine current is realized. As shown in fig. 4, a logic diagram of the protection operation of the protected object n for starting the machine current quick-break is shown. The main transformer start-up current quick-break protection action needs to satisfy the conditions (1) and (2) and simultaneously satisfy any one of the three conditions (3), (4) and (5):
(1) the operating condition of a quick-break element of the starting current is met, namely the current of any phase of the low-voltage side of the main transformer is greater than or equal to the setting value of the quick-break current of the starting current;
(2) the grid-connected condition is not met;
(3) the input of the start-up protection is opened through a low-voltage element, when the grid-connected condition is not met and the time delay requirement is smaller than the low-voltage condition, the low-voltage condition enables the start-up protection to be input, wherein: the value range of the low voltage set value is as follows: 0.3 Un-0.8 Un;
(4) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met and the terminal voltage is less than the terminal voltage set value, the low-frequency condition enables the start-up protection to be input, wherein: the value range of the set value of the terminal voltage is as follows: 0.1 Un-0.5 Un;
(5) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met, the terminal voltage is greater than or equal to the terminal voltage set value, and the frequency is smaller than the frequency set value, the start-up protection is input through the low-frequency condition, wherein: the value range of the frequency set value is as follows: 0.85fn～0.98fn。
As shown in fig. 5, which is a schematic diagram of the failure points of the generator transformer bank/phase modulator transformer bank, the operation behavior of the start-up main protection at the corresponding failure points is shown in table 1:
table 1 behavior of the Start-Up Master protection at various failure points
The start-up overcurrent protection is used as a backup protection of the start-up main protection, the maximum current value in the normal start-up process needs to be avoided through fixed value setting, and the start-up overcurrent protection can act on the outlet after the action characteristic is delayed by t.
As shown in fig. 6, for the generator/phase modulator start-up overcurrent protection action logic diagram, the start-up overcurrent protection action needs to satisfy the conditions (1) and (2) and simultaneously satisfy any one of the three conditions (3), (4), and (5):
(1) the starting overcurrent element action condition is met, namely, any phase current in the three-phase current at the neutral point side is greater than or equal to the starting overcurrent setting value;
(2) the grid-connected condition is not met;
(3) the input of the start-up protection is opened through a low-voltage element, when the grid-connected condition is not met and the time delay requirement is smaller than the low-voltage condition, the low-voltage condition enables the start-up protection to be input, wherein: the value range of the low voltage set value is as follows: 0.3 Un-0.8 Un;
(4) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met and the terminal voltage is less than the terminal voltage set value, the low-frequency condition enables the start-up protection to be input, wherein: the value range of the set value of the terminal voltage is as follows: 0.1 Un-0.5 Un;
(5) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met, the terminal voltage is greater than or equal to the terminal voltage set value, and the frequency is smaller than the frequency set value, the start-up protection is input through the low-frequency condition, wherein: the value range of the frequency set value is as follows: 0.85fn～0.98fn。
The starting zero sequence overvoltage protection is used as protection when single-phase grounding occurs at the generator end side of the generator/phase modulator in a non-direct grounding mode, zero sequence unbalanced voltage in a normal starting process needs to be avoided through fixed value setting, and the action characteristic of the starting zero sequence overvoltage protection can act through time delay t to act an outlet.
As shown in fig. 7, for the starting zero sequence overvoltage protection action logic diagram of the generator/phase modulator, the starting zero sequence overvoltage protection action needs to satisfy the conditions (1) and (2) and simultaneously satisfy any one of the three conditions (3), (4), and (5):
(1) the zero-sequence overvoltage element action condition of starting is met, namely the zero-sequence voltage on the neutral point side or the triangular zero-sequence voltage at the opening of the machine end is greater than or equal to the zero-sequence voltage setting value of starting;
(2) the grid-connected condition is not met;
(3) the input of the start-up protection is opened through a low-voltage element, when the grid-connected condition is not met and the time delay requirement is smaller than the low-voltage condition, the low-voltage condition enables the start-up protection to be input, wherein: the value range of the low voltage set value is as follows: 0.3 Un-0.8 Un;
(4) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met and the terminal voltage is less than the terminal voltage set value, the low-frequency condition enables the start-up protection to be input, wherein: the value range of the set value of the terminal voltage is as follows: 0.1 Un-0.5 Un;
(5) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met, the terminal voltage is greater than or equal to the terminal voltage set value, and the frequency is smaller than the frequency set value, the start-up protection is input through the low-frequency condition, wherein: the value range of the frequency set value is as follows: 0.85fn～0.98fn。
As shown in fig. 5, the generator transformer bank/phase modulator transformer bank fault point schematic diagram shows the following actions at the corresponding fault point for the startup backup protection:
TABLE 2 behavior of boot backup protection at various failure points
The starting process is a variable-frequency boosting process, different starting modes are adopted, and the variable-frequency boosting process is completely different, so that the frequency-independent algorithm is adopted for the main starting protection and the backup starting protection, and the current and voltage amplitude can be accurately calculated in the whole starting process.
In the starting stage, faults occur in any protected object range, the faults can be identified in two electrical cycle times, the faults can be removed quickly, and the safety of equipment and a power grid is further ensured.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The starting protection configuration method based on the protected object is characterized by comprising the following steps:
for a generator transformer bank, dividing the generator transformer bank into a generator, a main transformer, a service transformer and an excitation transformer according to protected objects, and respectively configuring starting main protection for each protected object, wherein the starting main protection comprises starting differential protection;
dividing a phase modulator transformer group into a phase modulator, a main transformer and an excitation transformer according to protected objects, and respectively configuring starting main protection for each protected object, wherein the starting main protection comprises starting differential protection;
the differential protection action of starting the protected object should satisfy the conditions (1) and (2) and simultaneously satisfy any one of the three conditions (3), (4) and (5):
(1) the starting differential current element action condition is met, namely, the starting differential current of any phase of the protected object is greater than or equal to the starting differential current setting value;
(2) the grid-connected condition is not met;
(3) the input of the start-up protection is opened through a low-voltage element, when the grid-connected condition is not met and the time delay requirement is smaller than the low-voltage condition, the low-voltage condition enables the start-up protection to be input, wherein: the value range of the low voltage set value is as follows: 0.3 Un-0.8 Un;
(4) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met and the terminal voltage is less than the terminal voltage set value, the low-frequency condition enables the start-up protection to be input, wherein: the value range of the set value of the terminal voltage is as follows: 0.1 Un-0.5 Un;
(5) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met, the terminal voltage is greater than or equal to the terminal voltage set value, and the frequency is smaller than the frequency set value, the start-up protection is input through the low-frequency condition, wherein: the value range of the frequency set value is as follows: 0.85fn～0.98fn；
Wherein: un represents the terminal rated voltage; f. ofnRepresenting the nominal frequency of the system.
2. The protected-object-based startup protection configuration method according to claim 1, wherein the startup differential current is calculated by: and connecting a current transformer to each terminal of the protected object, and calculating the starting differential current of the protected object by adopting a frequency-independent algorithm.
3. The protected object-based startup protection configuration method according to claim 2, wherein the calculation method of the startup differential current setting value is as follows: and calculating a starting differential current setting value according to the transmission error of the current transformer which is kept away and multiplied by a reliable coefficient.
4. The protected object-based startup protection configuration method according to claim 1, wherein when the protected object is a main transformer, the startup main protection further comprises a main transformer startup current snap-off protection.
5. The start-up protection configuration method based on protected object according to claim 4, wherein the main transformer start-up current quick-break protection action needs to satisfy the conditions (1) and (2) and simultaneously satisfy any one of the three conditions (3), (4), and (5):
(1) the operating condition of a quick-break element of the starting current is met, namely the current of any phase of the low-voltage side of the main transformer is greater than or equal to the setting value of the quick-break current of the starting current;
(2) the grid-connected condition is not met;
(3) the input of the start-up protection is opened through a low-voltage element, when the grid-connected condition is not met and the time delay requirement is smaller than the low-voltage condition, the low-voltage condition enables the start-up protection to be input, wherein: the value range of the low voltage set value is as follows: 0.3 Un-0.8 Un;
(4) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met and the terminal voltage is less than the terminal voltage set value, the low-frequency condition enables the start-up protection to be input, wherein: the value range of the set value of the terminal voltage is as follows: 0.1 Un-0.5 Un;
(5) the start-up protection is started through a low-frequency element, when the grid-connected condition is not met, the terminal voltage is greater than or equal to the terminal voltage set value, and the frequency is less than the frequency set value, the low-frequency condition enables the low-frequency condition to ensure that the grid-connected condition is not metStarting the machine to protect the investment, wherein: the value range of the frequency set value is as follows: 0.85fn～0.98fn；
Wherein: un represents the terminal rated voltage; f. ofnRepresenting the nominal frequency of the system.
6. The protected object-based startup protection configuration method according to claim 1, further comprising configuring startup backup protection, including startup overcurrent protection and startup zero-sequence voltage protection.
7. The protected-object-based startup protection configuration method according to claim 6, wherein the startup overcurrent protection action needs to satisfy the conditions (1) and (2) and simultaneously satisfy any one of the three conditions (3), (4), and (5):
(1) the starting overcurrent element action condition is met, namely, any phase current in the three-phase current at the neutral point side is greater than or equal to the starting overcurrent setting value;
(2) the grid-connected condition is not met;
(3) the input of the start-up protection is opened through a low-voltage element, when the grid-connected condition is not met and the time delay requirement is smaller than the low-voltage condition, the low-voltage condition enables the start-up protection to be input, wherein: the value range of the low voltage set value is as follows: 0.3 Un-0.8 Un;
(4) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met and the terminal voltage is less than the terminal voltage set value, the low-frequency condition enables the start-up protection to be input, wherein: the value range of the set value of the terminal voltage is as follows: 0.1 Un-0.5 Un;
(5) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met, the terminal voltage is greater than or equal to the terminal voltage set value, and the frequency is smaller than the frequency set value, the start-up protection is input through the low-frequency condition, wherein: the value range of the frequency set value is as follows: 0.85fn～0.98fn；
Wherein: un represents the terminal rated voltage; f. ofnRepresenting the nominal frequency of the system.
8. The protected-object-based startup protection configuration method according to claim 6, wherein the startup zero-sequence voltage protection action needs to satisfy the conditions (1) and (2) and simultaneously satisfy any one of the three conditions (3), (4), and (5):
(1) the zero-sequence overvoltage element action condition of starting is met, namely the zero-sequence voltage on the neutral point side or the triangular zero-sequence voltage at the opening of the machine end is greater than or equal to the zero-sequence voltage setting value of starting;
(2) the grid-connected condition is not met;
(3) the input of the start-up protection is opened through a low-voltage element, when the grid-connected condition is not met and the time delay requirement is smaller than the low-voltage condition, the low-voltage condition enables the start-up protection to be input, wherein: the value range of the low voltage set value is as follows: 0.3 Un-0.8 Un;
(4) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met and the terminal voltage is less than the terminal voltage set value, the low-frequency condition enables the start-up protection to be input, wherein: the value range of the set value of the terminal voltage is as follows: 0.1 Un-0.5 Un;
(5) the input of the start-up protection is opened through a low-frequency element, when the grid-connected condition is not met, the terminal voltage is greater than or equal to the terminal voltage set value, and the frequency is smaller than the frequency set value, the start-up protection is input through the low-frequency condition, wherein: the value range of the frequency set value is as follows: 0.85fn～0.98fn；
Wherein: un represents the terminal rated voltage; f. ofnRepresenting the nominal frequency of the system.
9. The protected object-based startup protection configuration method according to any one of claims 1 to 3, 5, 7 and 8, wherein the grid-connection condition is that:
the grid-connected switch state is in the on position or the grid-connected switch current is in the current condition within the set time range, wherein the value range of the set time is as follows: 0.01 second to 10 seconds.
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| CN104420985A (en) * | 2013-08-30 | 2015-03-18 | 郭庆梅 | Combined power generation system |
| CN107453404A (en) * | 2017-08-08 | 2017-12-08 | 国家电网公司 | A kind of large-scale phase modifier starts combination method |
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| CN104420985A (en) * | 2013-08-30 | 2015-03-18 | 郭庆梅 | Combined power generation system |
| CN107453404A (en) * | 2017-08-08 | 2017-12-08 | 国家电网公司 | A kind of large-scale phase modifier starts combination method |
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| 大容量调相机继电保护配置方案研究;罗凌等;《湖南电力》;20161025;第36卷(第05期);第26-30页 * |
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