CN115800198A - Operation condition identification method and system suitable for pumped storage unit protection - Google Patents
Operation condition identification method and system suitable for pumped storage unit protection Download PDFInfo
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- CN115800198A CN115800198A CN202211463125.9A CN202211463125A CN115800198A CN 115800198 A CN115800198 A CN 115800198A CN 202211463125 A CN202211463125 A CN 202211463125A CN 115800198 A CN115800198 A CN 115800198A
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Abstract
The invention discloses an operation condition identification method suitable for pumped storage unit protection, which comprises the following steps: collecting position contact information, analog quantity information and monitoring system unit working condition information of a pumped storage unit circuit breaker and a disconnecting switch; setting a state information criterion, and judging the state information of the circuit breaker and the state information of the disconnecting switch; monitoring the working condition information of the unit of the system by using the state information of the circuit breaker and the state information of the disconnecting switch, and judging the current operating condition of the unit; comprehensively checking the current operation condition of the unit based on the operation characteristic when the protection is not started and the condition conversion direction, successfully checking, and outputting the current operation condition of the unit; and if the verification fails, keeping the current operation condition of the unit in the previous state. The invention can improve the reliability of the operation condition identification of the pumped storage unit protection, and protect the accuracy of the switch position contact entry judgment and the switch position abnormity judgment, and the reliability and the accuracy of the operation condition identification of the pumped storage unit.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to an operation condition identification method suitable for pumped storage unit protection.
Background
The pumped storage unit adopts a reversible pump turbine and a generator motor, has two running directions of power generation and pumped storage, and compared with a conventional generator, the pumped storage unit is additionally provided with a phase change switch, a dragging switch, a dragged switch and an SFC static frequency converter, and when the pumped storage unit runs in the pumped storage direction, the pumped storage unit is started through the SFC or a back-to-back mode, and phase change is required to be carried out through the phase change switch. The pumped storage unit has complex wiring pattern, various operation modes and frequent working condition conversion, and generally comprises more than ten working conditions of power generation operation, power generation phase modulation, pumped operation, pumped phase modulation, SFC (Small form-factor computer) starting, back-to-back starting, power generation starting, electric braking, rotation standby and the like, and different protection functions need to be automatically put into or locked under different working conditions, so the reliability of the identification of the operating working conditions of the pumped storage unit directly influences the protection performance of the pumped storage unit.
A method for judging the existing working condition of pumped storage unit protection is introduced. 1) The method is relatively dependent on the reliability of a loop opened by the monitoring system, and the short-time working condition overlapping or the working condition complete absence can occur in the working condition conversion process of the unit; 2) The method directly adopts switch local position signals to judge the operation condition, does not need the judgment result of a monitoring system, improves the reliability of the condition judgment to a certain extent, but judges the phase modulation condition through the position of a water guide vane, and possibly has the risk of false locking reverse power protection; in the engineering field, the operating condition of the unit is judged wrongly due to the fact that the monitoring system signal or the switch local position signal is input and judged wrongly, and the situation of protecting wrong locking and misoperation is caused, so that the operating condition of the pumped storage unit is judged by adopting a single criterion of hard wiring input, and the accuracy and the reliability are to be improved.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an operation condition identification method suitable for protecting a pumped storage unit, which can improve the reliability and accuracy of operation condition identification of the pumped storage unit.
The invention adopts the following technical scheme.
An operation condition identification method suitable for protecting a pumped storage unit comprises the following steps:
step 1, collecting input information, analog quantity information and monitoring system unit working condition information of a pumped storage unit breaker and a position contact of a disconnecting switch;
step 2, setting a state information criterion, and judging the state information of the circuit breaker and the state information of the disconnecting switch by combining the information acquired in the step 1;
step 3, judging the working condition information of the system unit by using the state information of the circuit breaker and the state information of the disconnecting switch to obtain the current operating condition of each unit;
step 4, comprehensively verifying the current operation condition of the unit based on the operation characteristics and the condition conversion direction when the protection is not started, and outputting the current operation condition of the unit if the verification is successful; and if the verification fails, keeping the current operation condition of the unit in the last state.
Preferably, in step 1, the information of the position contacts of the circuit breaker and the disconnector of the pumped storage group includes: the phase-change switch comprises a switch-off position contact of a circuit breaker at a machine end, a switch-on position contact of the circuit breaker at the machine end, a switch-off position contact of a phase-change switch, a generating position contact of the phase-change switch, an electric position contact of the phase-change switch, a switch-off position contact of a dragging switch, a switch-on position contact of the dragging switch, a switch-off position contact of the dragged switch, a switch-on position contact of the dragged switch, a switch-off position contact of the electric brake switch and a phase-change mode contact for monitoring information of the phase-change mode contact for monitoring water pumping.
Preferably, in step 1, the analog quantity information includes: the switch current of the branch upper port where the breaker or the disconnecting switch is located.
Preferably, in step 1, the monitoring system unit operation information includes: and monitoring the opening information of the power generation phase modulation mode and the opening information of the water pumping phase modulation mode.
Preferably, in step 2, the state information criterion includes a unit position criterion, a double position criterion, a three position criterion and a branch current criterion;
the circuit breaker state information obtained by judgment comprises machine-end circuit breaker state information, and the disconnecting switch state information comprises dragging switch state information, dragged switch state information and commutation switch state information.
Preferably, in step 2, when the dual-position criterion and the branch current criterion are used for judging the states of the circuit breaker and the disconnector:
when the switch opening position contact is opened =1 and the switch closing position contact is opened =0, the switch is judged to be in the switch opening state;
when the switch opening position contact point is opened =0 and the switch closing position contact point is opened =1, the switch closing state is judged;
when the switch opening position contact and the switch closing position contact are both 1 or 0, judging that the switch position is abnormal, and alarming in a delayed manner, wherein the switch position state maintains the state before displacement;
when a switch opening position contact is opened =1 or a switch closing position contact is opened =0 and the switch current is greater than a no-current fixed value, judging that the switch position is abnormal, and delaying and alarming;
wherein, the switch is a breaker or a disconnecting switch.
Preferably, when the state judgment of the circuit breaker and the disconnecting switch is carried out by using the unit position criterion and the branch current criterion, the conditions that only the opening position of the switch is introduced and only the closing position of the switch is introduced are included:
when only the switch open position is introduced:
if the switch opening position contact is opened =1 and the switch current is smaller than the no-current fixed value, the switch opening state is judged, and if not, the switch closing state is judged;
if the contact point at the opening position of the switch is opened =1 and the current of the switch is greater than the no-current fixed value, judging that the position of the switch is abnormal, and delaying and alarming;
when only the switch-on position is introduced:
and if the contact point of the switch-on position is switched in =0 and the current of the switch is smaller than the no-current constant value, the switch is judged to be in a switch-off state, and otherwise, the switch is judged to be in a switch-on state.
If the contact point of the switch on position is switched in =0 and the switch current is larger than the no-current fixed value, judging that the switch position is abnormal, and delaying and alarming;
wherein, the switch is a breaker or an isolating switch.
Preferably, in step 2, when the phase change switch state information is judged by using the three-position criterion and the auxiliary branch current criterion:
when a switch opening position contact is opened =1, a switch power generation position contact is opened =0, and a switch electric position contact is opened =0, the switch is judged to be in a switch opening state;
when a switch opening position contact is opened =0, a switch power generation position contact is opened =1, and a switch electric position contact is opened =0, the switch power generation state is judged;
when a switch opening position contact is opened =0, a switch power generation position contact is opened =0, and a switch electric position contact is opened =1, the switch electric state is judged;
when the opening of the switch opening position contact, the switch power generation position contact and the switch electric position contact are all 0 or more than 1 switch position contact is 1, judging that the switch position is abnormal, and alarming in a delayed manner, wherein the switch position state maintains the state before displacement;
when the switch opening position contact is opened =1 and the switch current is greater than the no-current fixed value, determining that the position of the delay alarm switch is abnormal;
wherein, the switch is a breaker or an isolating switch.
Preferably, in the step 2, according to the opening of the opening position of the breaker end and the opening of the closing position of the breaker end, the state information of the breaker end is judged by using a double-position criterion and the breaker end current of the upper port of the breaker end;
judging the state information of the dragging switch by utilizing a double-position criterion and the current of the dragging switch according to the opening of the opening position of the dragging switch and the opening of the closing position of the dragging switch;
judging the state information of the dragged switch by utilizing a double-position criterion and the current of the dragged switch according to the opening of the opening position of the dragged switch and the opening of the closing position of the dragged switch;
and judging the state information of the commutation switch by utilizing three-position criteria and the machine end current of an upper port of a machine end circuit device according to the switching-off position switching-in of the commutation switch, the electric position switching-in of the commutation switch and the switching-on position switching-in of the commutation switch.
Preferably, in the step 3,
and performing multiple logic combinations on the breaker state information and the disconnector state information, wherein each logic combination represents one unit operation condition, the unit operation condition with the output of 1 is defined as the current unit operation condition, and the unit operation condition with the output of 0 is defined as other operation conditions.
Preferably, the checking in step 4 further comprises:
judging whether the current unit operation condition state meets the following conditions: the state of the current unit operating condition is 1, and the states of other operating conditions are 0; the current unit operation condition is consistent with the operation characteristics when the corresponding protection is not started; the conversion direction of the unit operation working condition in the previous state to the current unit operation working condition is correct;
and when the conditions are simultaneously met, the verification is successful, otherwise, the verification fails.
The invention also provides an operation condition identification system suitable for protecting the pumped storage unit, which comprises the following components: an information acquisition module, a state judgment module, a working condition judgment module and a check module,
The information acquisition module is used for position contact information and analog quantity information of the pumped storage unit circuit breaker and the isolating switch and monitoring system unit working condition information;
the state judgment module can set state information criteria and judge the state information of the circuit breaker and the state information of the disconnecting switch by combining the information collected by the information collection module;
the working condition judgment module can judge the unit operation working condition by combining the information acquired by the information acquisition module, the breaker state information acquired by the state judgment module and the disconnecting switch state information;
the calibration module can calibrate the operation condition of the pumped storage unit and adjust the operation condition of the unit according to the calibration result.
Compared with the prior art, the method for identifying the operation condition suitable for protecting the pumped storage unit solves the problem that the reliability of the operation condition of the pumped storage unit is lower by only adopting a single criterion of opening a hard wire; the accuracy of judging the switch position contact entrance and judging the switch position abnormity is improved by utilizing the switch position criterion and the branch current criterion; the reliability and the accuracy of the identification of the operating condition of the pumped storage unit are improved by protecting the reverse verification of the operating characteristics when the pumped storage unit is not started and the positive verification of the operating condition conversion direction; according to the method, the current operation condition of the unit is subjected to reverse verification based on the operation characteristics when the unit is not started, wherein the operation characteristics of the unit are subjected to reverse verification, and direction verification is performed only by using the operation characteristics which are most unlikely to appear under the current operation condition when the unit is not started, so that the operation condition characteristics caused by abnormal operation and short-circuit faults when the operation condition is judged by adopting multiple electrical characteristics are avoided.
Drawings
FIG. 1 is a schematic flow chart of steps of a method for identifying operating conditions suitable for protecting a pumped storage unit according to the present invention;
fig. 2 is a schematic structural diagram of an operation condition recognition system suitable for protecting a pumped storage unit in the invention.
Detailed Description
The present application 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 application is not limited thereby.
The invention provides an operation condition identification method suitable for protecting a pumped storage unit. As shown in fig. 1, the method comprises the steps of:
step 1, collecting input information, analog quantity information and monitoring system unit working condition information of position contacts of a pumped storage unit breaker and a disconnecting switch.
The collected opening information of the position contacts of the pumped storage unit circuit breaker and the isolating switch comprises and is not limited to opening information of a brake separating position contact of the generator-end circuit breaker, a brake closing position contact of the generator-end circuit breaker, a brake separating position contact of the phase change switch, a power generating position contact of the phase change switch, an electric position contact of the phase change switch, a brake separating position contact of the dragging switch, a brake closing position contact of the dragging switch, a brake separating position contact of the dragged switch, a brake closing position contact of the dragged switch, an electric brake separating position contact of the electric brake switch, a monitoring power generation phase modulation mode contact and a monitoring pumped phase modulation mode contact;
in the invention, the obtained opening information is 0 or 1, the opening setting is 1, and the opening non-setting is 0.
The number of the position contacts of the same breaker or isolating switch is one or two or three, for example, the circuit breaker at the machine end comprises two pairs of position contacts at the opening and closing positions, and the phase change switch comprises three pairs of position contacts at the opening, generating and electric positions;
specifically, the position contact information of the circuit breaker and the disconnecting switch of the pumped storage unit is shown in the following table 1;
table 1: position contact input meter
| Serial number | Amount of position contact |
| 1 | Brake separating position of machine end breaker |
| 2 | Switch-on position of breaker at machine end |
| 3 | Phase-change switch opening position |
| 4 | Phase change switch power generation position |
| 5 | Electric position of phase change switch |
| 6 | Brake separating position of drag switch |
| 7 | Drag switch on position |
| 8 | Opening position of dragged switch |
| 9 | Switch-on position of dragged switch |
| 10 | Brake separating position of electric brake switch |
| 11 | Monitoring power generation phase modulation patterns |
| 12 | Monitoring pumped phase modulation patterns |
The acquired analog quantity information comprises and is not limited to the switching current of the upper ports of the branch circuit breaker and the isolating switch;
the collected operation information of the monitoring system unit comprises and is not limited to monitoring the opening information of a power generation phase modulation mode and the opening information of a water pumping phase modulation mode.
Step 2, setting a state information criterion, and judging the state information of the circuit breaker and the state information of the disconnecting switch by combining the information collected in the step 1;
specifically, the state information criterion comprises a single-position criterion, a double-position criterion, a three-position criterion, an auxiliary branch current criterion, and breaker state information and disconnector state information are judged.
The obtained breaker state information comprises machine-end breaker state information, and the isolation switch state information comprises dragging switch state information, dragged switch state information and commutation switch state information.
Specifically, a switch is used for replacing a circuit breaker and a disconnecting switch, and the obtained switch state discrimination logic is as follows:
when the state judgment of the circuit breaker and the disconnecting switch is carried out by utilizing the unit position criterion and the branch current criterion, the conditions that only the opening position of the switch is introduced and only the closing position of the switch is introduced are included:
when only the switch open position is introduced:
if the switch opening position contact is opened =1 and the switch current is smaller than the no-current fixed value, the switch opening state is judged, and if not, the switch closing state is judged;
if the switch opening position contact is opened =1 and the switch current is larger than the no-current fixed value, the switch position is judged to be abnormal, and the time delay alarm is given.
When only the switch-on position is introduced:
and if the contact of the switch-on position is switched in =0 and the switch current is smaller than the no-current fixed value, determining that the switch is in the switch-off state, otherwise, determining that the switch is in the switch-on state.
If the contact point at the switch-on position is switched in =0 and the switch current is larger than the no-current fixed value, the switch position is judged to be abnormal, and the alarm is delayed.
When the state judgment of the circuit breaker and the disconnecting switch is carried out by utilizing the double-position criterion and the branch current criterion:
when the contact point at the switch opening position is opened =1 and the contact point at the switch closing position is opened =0, the switch opening state is judged;
when the switch opening position contact point is opened =0 and the switch closing position contact point is opened =1, the switch closing state is judged;
when the switch opening of the switch opening position contact and the switch closing position contact are both '1' or '0', judging that the switch position is abnormal, and alarming in a delayed manner, wherein the switch position state is maintained in a state before displacement;
when the switch opening position contact is opened =1 or the switch closing position contact is opened =0 and the switch current is larger than the no-current fixed value, the switch position is judged to be abnormal, and the alarm is delayed.
When the three-position criterion and the branch current criterion are utilized to judge the states of the breaker and the disconnecting switch:
when a switch opening position contact is opened =1, a switch power generation position contact is opened =0, and a switch electric position contact is opened =0, the switch is judged to be in a switch opening state;
when a switch opening position contact is opened =0, a switch power generation position contact is opened =1, and a switch electric position contact is opened =0, the switch power generation state is judged;
when a switch opening position contact is opened =0, a switch power generation position contact is opened =0, and a switch electric position contact is opened =1, the switch electric state is judged;
when the opening of the switch opening position contact, the switch power generation position contact and the switch electric position contact are all '0' or more than 1 switch position contact is '1', the switch position is judged to be abnormal, the alarm is delayed, and the state of the switch position is maintained before displacement;
and when the switch opening position contact is opened =1 and the switch current is greater than the no-current fixed value, determining that the position of the delay alarm switch is abnormal.
Further, the state of the circuit breaker at the machine end, the state of the dragging switch, the state of the dragged switch and the state of the phase change switch are judged according to the judgment logic, specifically:
judging the state information of the circuit breaker at the outlet end by utilizing double-position criteria and the circuit breaker end current at the upper port of the circuit breaker at the outlet end according to the opening of the opening position of the circuit breaker at the outlet end and the opening of the closing position of the circuit breaker at the inlet end;
similarly, according to the opening of the opening position of the dragging switch and the opening of the closing position of the dragging switch, the state information of the dragging switch is judged by utilizing a double-position criterion and the current of the dragging switch;
according to the opening of the opening position of the dragged switch and the opening of the closing position of the dragged switch, the double-position criterion and the current dragged switch state information of the dragged switch are utilized;
and judging the state information of the commutation switch by utilizing three-position criteria and the machine end current of an upper port of a machine end circuit device according to the switching-off position switching-in of the commutation switch, the electric position switching-in of the commutation switch and the switching-on position switching-in of the commutation switch.
And 3, monitoring the unit working condition information of the system by using the state information of the circuit breaker and the state information of the disconnecting switch, and judging the current operating condition of the unit.
The method for judging the operation condition of the unit in the step 3 specifically comprises the following steps:
and performing multiple logic combinations on the breaker state information and the disconnector state information, wherein each logic combination represents one unit operation condition, the unit operation condition with the output of 1 is defined as the current unit operation condition, and the unit operation condition with the output of 0 is defined as other operation conditions.
Combining the monitoring power generation phase modulation mode obtained in the step 1 and the pumping phase modulation mode, and the breaker state information and the isolating switch state information obtained in the step 2, carrying out multiple logic combinations according to the state of a breaker at a machine end, the state of a phase change switch, the state of a dragging switch, the state of a dragged switch, the state of an electric brake switch, the monitoring power generation phase modulation mode and the monitoring pumping phase modulation mode, wherein each logic combination represents one machine set operation condition, the machine set operation condition is judged, and the relationship among the machine set operation condition, the breaker state information and the isolating switch state information is shown in the following table 2;
table 2: unit operation condition table
Step 4, comprehensively verifying the current operation condition of the unit based on the operation characteristics and the condition conversion direction when the protection is not started, and outputting the current operation condition of the unit if the verification is successful; and if the verification fails, keeping the current operation condition of the unit in the last state.
The step 4 specifically comprises the following steps:
judging whether the current unit operation condition state meets the following conditions:
condition 1: the running working condition state of only one current unit is 1, and the running working condition states of other units are 0;
condition 2: the current unit operation condition is consistent with the operation characteristic when the corresponding protection is not started;
condition 3: the conversion direction of the unit operation working condition in the previous state to the current unit operation working condition is correct;
checking the working condition by combining the conditions, and when the condition 1, the condition 2 and the condition 3 are simultaneously met, successfully checking the working condition and outputting the current operation working condition; otherwise, the verification fails, and the operation condition of the unit in the last state is kept.
In particular, the invention checks the operation condition of the pumped storage unit,
for condition 1: the operation working conditions of the pumped storage unit comprise power generation operation, power generation phase modulation, water pump operation, water pump phase modulation, dragger working conditions, dragged working conditions and electric brake working condition states, if only one operation working condition is '1', and other operation working condition states are '0', the condition 1 is met, and the condition 1 is output at the moment; otherwise, the condition 1 is not met, and the condition 1 outputs 0;
for condition 2: the operation characteristics of the current unit under the operation condition and the protection corresponding to the operation condition are subjected to inverse verification when the protection is not started, the operation characteristics when the protection is not started are shown in the following table 3, the NOR gate output is adopted, when the locking output of the operation condition and the locking output of other locks are 0, the condition 2 is met, and at the moment, the condition 2 outputs 1; otherwise, it indicates that condition 2 is not satisfied, and condition 2 outputs 0.
Table 3: protection operation characteristic table
For condition 3: and (3) converting the operation working conditions of the pumped storage unit, converting according to the determined direction and the flow, and defining the positive direction of the working condition conversion of the unit, wherein as shown in the following table 4, when the direction of the conversion from the operation working condition of the unit in the last state to the operation working condition of the current unit is correct, the condition 3 is output to be 1, otherwise, the condition 3 is not satisfied, and the condition 3 is output to be 0.
TABLE 4 Unit operation condition conversion direction chart
Outputting the current unit operation condition: and combining the outputs of the conditions 1, 2 and 3, when the conditions 1, 2 and 3 are simultaneously met, namely the outputs of the conditions 1, 2 and 3 are all 1, indicating that the working condition verification is successful, outputting the current operation working condition, otherwise indicating that the verification is failed, and keeping the operation working condition of the unit in the last state.
As shown in fig. 2, the present invention further provides an operation condition identification system suitable for protecting a pumped storage group, where the operation condition identification method can be implemented based on the system, and the system specifically includes: an information acquisition module, a state judgment module, a working condition judgment module and a check module,
Specifically, the information acquisition module is used for position contact information and analog quantity information of the circuit breaker and the disconnecting switch of the pumped storage unit and unit working condition information of the monitoring system;
the state judgment module can set a unit position criterion, a double position criterion and a three position criterion, assist a branch current criterion, and judge the state information of the circuit breaker and the state information of the disconnecting switch by combining the information collected by the information collection module;
the working condition judgment module can judge the unit operation working condition by combining the information acquired by the information acquisition module, the breaker state information acquired by the state judgment module and the disconnecting switch state information;
the calibration module can calibrate the operation condition of the pumped storage unit and adjust the operation condition of the unit according to the calibration result.
Compared with the prior art, the method has the advantages that the accuracy of judging the switch-in of the switch position contact and judging the abnormal switch position by protection is improved by utilizing the switch position criterion and the branch current criterion; the reliability and the accuracy of the identification of the operation condition of the pumped storage unit are improved by protecting the operation characteristic when the pumped storage unit is not started for reverse verification and verifying the working condition conversion direction.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (12)
1. An operation condition identification method suitable for protecting a pumped storage unit is characterized by comprising the following steps:
step 1, collecting input information, analog quantity information and monitoring system unit working condition information of a pumped storage unit breaker and a position contact of a disconnecting switch;
step 2, setting a state information criterion, and judging the state information of the circuit breaker and the state information of the disconnecting switch by combining the information collected in the step 1;
step 3, judging the working condition information of the system unit by using the state information of the circuit breaker and the state information of the disconnecting switch to obtain the current operating condition of each unit;
step 4, comprehensively checking the current operation condition of the unit based on the operation characteristics and the condition conversion direction when the protection is not started, and outputting the current operation condition of the unit if the checking is successful; and if the verification fails, keeping the current operation condition of the unit in the last state.
2. The method for identifying operating conditions suitable for pumped-storage group protection according to claim 1,
in step 1, the position contact information of the pumped storage unit circuit breaker and the disconnecting switch comprises: the phase-change switch comprises a switch-off position contact of a circuit breaker at a machine end, a switch-on position contact of the circuit breaker at the machine end, a switch-off position contact of a phase-change switch, a generating position contact of the phase-change switch, an electric position contact of the phase-change switch, a switch-off position contact of a dragging switch, a switch-on position contact of the dragging switch, a switch-off position contact of the dragged switch, a switch-on position contact of the dragged switch, a switch-off position contact of the electric brake switch and a phase-change mode contact for monitoring information of the phase-change mode contact for monitoring water pumping.
3. The method for identifying operating conditions suitable for pumped-storage group protection according to claim 1,
in step 1, the analog quantity information includes: the switch current of the branch upper port where the breaker or the disconnecting switch is located.
4. The method for identifying operating conditions suitable for pumped-storage group protection according to claim 1,
in step 1, the operation information of the monitoring system unit includes: and monitoring the opening information of the power generation phase modulation mode and the opening information of the water pumping phase modulation mode.
5. The method for identifying operating conditions suitable for pumped-storage group protection according to claim 1,
in the step 2, the state information criterion comprises a unit position criterion, a double position criterion, a three position criterion and a branch current criterion;
the circuit breaker state information obtained by judgment comprises machine-end circuit breaker state information, and the disconnecting switch state information comprises dragging switch state information, dragged switch state information and commutation switch state information.
6. The method for identifying operating conditions suitable for pumped-storage group protection according to claim 5,
in the step 2, when the state judgment of the circuit breaker and the disconnecting switch is carried out by using the double-position criterion and the branch current criterion:
when the contact point at the switch opening position is opened =1 and the contact point at the switch closing position is opened =0, the switch opening state is judged;
when the switch opening position contact is opened =0 and the switch closing position contact is opened =1, the switch closing state is judged;
when the switch opening of the switch opening position contact and the switch closing position contact are both 1 or 0, the switch position is judged to be abnormal, the alarm is delayed, and the state of the switch position is maintained before displacement;
when the contact point of the switch opening position is opened =1 or the contact point of the switch closing position is opened =0 and the switch current is larger than the no-current fixed value, judging that the switch position is abnormal, and delaying and alarming;
wherein, the switch is a breaker or a disconnecting switch.
7. The method for identifying operating conditions suitable for pumped-storage group protection according to claim 5,
when the circuit breaker and the disconnecting switch are judged by using the unit position criterion and the branch current criterion, the conditions that only the opening position of the switch is introduced and only the closing position of the switch is introduced are included:
when only the switch open position is introduced:
if the switch opening position contact is opened =1 and the switch current is smaller than the no-current fixed value, the switch opening state is judged, and if not, the switch closing state is judged;
if the switch opening position contact is opened =1 and the switch current is greater than the no-current fixed value, judging that the switch position is abnormal, and giving an alarm in a delayed manner;
when only the switch-on position is introduced:
and if the contact point of the switch-on position is switched in =0 and the current of the switch is smaller than the no-current constant value, the switch is judged to be in a switch-off state, and otherwise, the switch is judged to be in a switch-on state.
If the contact point of the switch on position is switched in =0 and the switch current is larger than the no-current fixed value, judging that the switch position is abnormal, and delaying and alarming;
wherein, the switch is a breaker or an isolating switch.
8. The method for identifying operating conditions suitable for pumped-storage group protection according to claim 5,
in the step 2, when the three-position criterion and the auxiliary branch current criterion are used for judging the state information of the commutation switch:
when a switch opening position contact is opened =1, a switch power generation position contact is opened =0, and a switch electric position contact is opened =0, the switch is judged to be in a switch opening state;
when a switch opening position contact is opened =0, a switch power generation position contact is opened =1, and a switch electric position contact is opened =0, the switch power generation state is judged;
when a switch opening position contact is opened =0, a switch power generation position contact is opened =0, and a switch electric position contact is opened =1, the switch electric state is judged;
when the opening of the switch opening position contact, the switch power generation position contact and the switch electric position contact are all 0 or more than 1 switch position contact is 1, judging that the switch position is abnormal, and alarming in a delayed mode, wherein the switch position state maintains the state before displacement;
when the switch opening position contact is opened =1 and the switch current is greater than the no-current fixed value, determining that the position of the delay alarm switch is abnormal;
wherein, the switch is a breaker or an isolating switch.
9. The method for identifying operating conditions suitable for pumped-storage group protection according to claim 5,
in the step 2, judging the state information of the circuit breaker at the outlet end by utilizing double-position criteria and the machine end current of the upper port of the circuit breaker at the machine end according to the opening of the opening position of the circuit breaker at the machine end and the opening of the closing position of the circuit breaker at the machine end;
judging the state information of the drag switch by using a double-position criterion and the current of the drag switch according to the opening of the opening position of the drag switch and the opening of the closing position of the drag switch;
judging the state information of the dragged switch by utilizing a double-position criterion and the current of the dragged switch according to the opening of the opening position of the dragged switch and the opening of the closing position of the dragged switch;
and judging the state information of the commutation switch by utilizing three-position criteria and the machine end current of an upper port of a machine end circuit device according to the switching-off position switching-in of the commutation switch, the electric position switching-in of the commutation switch and the switching-on position switching-in of the commutation switch.
10. The method for identifying operating conditions suitable for pumped-storage group protection according to claim 6,
in the step (3), the step (c),
and performing multiple logic combinations on the breaker state information and the disconnector state information, wherein each logic combination represents one unit operation condition, the unit operation condition with the output of 1 is defined as the current unit operation condition, and the unit operation condition with the output of 0 is defined as other operation conditions.
11. The method for identifying operating conditions suitable for pumped-storage group protection according to claim 10,
the checking in step 4 further comprises:
judging whether the current unit operation condition state meets the following conditions: only one current unit is in a state of 1 in the operating condition, and the other units are in a state of 0 in the operating condition; the current unit operation condition is consistent with the operation characteristic when the corresponding protection is not started; the conversion direction of the unit operation working condition in the previous state to the current unit operation working condition is correct;
and when the conditions are simultaneously met, the verification is successful, otherwise, the verification fails.
12. An operation condition identification system suitable for pumped storage group protection by using the operation condition identification method suitable for pumped storage group protection according to any one of claims 1 to 11, comprising: an information acquisition module, a state judgment module, a working condition judgment module and a check module,
The information acquisition module is used for acquiring position contact information and analog quantity information of the pumped storage unit circuit breaker and the isolating switch and monitoring system unit working condition information;
the state judgment module can set state information criteria and judge the state information of the circuit breaker and the state information of the disconnecting switch by combining the information collected by the information collection module;
the working condition judgment module can judge the unit operation working condition by combining the information acquired by the information acquisition module, the breaker state information acquired by the state judgment module and the disconnecting switch state information;
the checking module can check the operation condition of the pumped storage unit and adjust the operation condition of the unit according to the checking result.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117277227A (en) * | 2023-10-09 | 2023-12-22 | 南方电网调峰调频发电有限公司检修试验分公司 | Tripping protection method and device for excitation system of pumped storage unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117277227A (en) * | 2023-10-09 | 2023-12-22 | 南方电网调峰调频发电有限公司检修试验分公司 | Tripping protection method and device for excitation system of pumped storage unit |
| CN117277227B (en) * | 2023-10-09 | 2024-03-08 | 南方电网调峰调频发电有限公司检修试验分公司 | Tripping protection method and device for excitation system of pumped storage unit |
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