CN110707710B - Dual-power-supply automatic voltage regulating system and method based on efficient filtering unit - Google Patents
Dual-power-supply automatic voltage regulating system and method based on efficient filtering unit Download PDFInfo
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- CN110707710B CN110707710B CN201911046143.5A CN201911046143A CN110707710B CN 110707710 B CN110707710 B CN 110707710B CN 201911046143 A CN201911046143 A CN 201911046143A CN 110707710 B CN110707710 B CN 110707710B
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02H7/22—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 distribution gear, e.g. bus-bar systems; for switching devices
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention discloses a dual-power automatic voltage regulating system and method based on a high-efficiency filtering unit.A high-voltage plant transformer on-load voltage regulating unit is connected with a high-voltage bus sequentially through a working power supply inlet wire common box bus, a working power supply inlet wire breaker and a working power supply inlet wire common box bus current transformer; a working power supply inlet wire voltage transformer is arranged around the working power supply inlet wire common box bus; a bus voltage transformer is arranged around the high-voltage bus; the standby power supply inlet wire voltage transformer is arranged around the standby power supply inlet wire common box bus, the system and the method can identify and filter the bus voltage fluctuation caused by the fluctuation of the system voltage and the start and stop of the high-capacity auxiliary machine, and meanwhile, the automatic adjustment of the high-voltage bus voltage can be realized.
Description
Technical Field
The invention belongs to the technical field of automatic voltage regulation of power plants, and relates to a dual-power-supply automatic voltage regulation system and method based on a high-efficiency filtering unit.
Background
The power plant sets up high-pressure service power and satisfies the needs of service high-pressure load usually, and service power voltage is too high or low can influence the normal operating of auxiliary engine for service, influences the life-span of auxiliary engine even. At present, most high-voltage plant transformers and starting and standby transformers of power plants are provided with load voltage regulating devices, so that the service power can be kept in a reasonable range by regulating the gears of the transformers. In the early stage, the service voltage regulation is usually completed by manual regulation, operators are required to monitor the bus voltage for a long time, and the regulation effect is greatly influenced by human factors; in the later stage, along with the development of an automation technology, an automatic voltage regulating system based on the on-load voltage regulating device is gradually applied, and the influence of human factors is reduced.
The traditional automatic voltage regulating system only focuses on voltage regulation, and any voltage fluctuation can start the on-load voltage regulating device. In the actual operation process, the fluctuation of the bus voltage can be caused by the fluctuation of the system voltage and the starting of the large auxiliary machine, so that the on-load voltage regulation device is frequently started, and the gear is frequently adjusted. The on-load voltage regulation device can slightly discharge when being started once, the on-load oil filter needs to be started for filtering oil once, and the service life of the on-load voltage regulation device can be influenced by frequent long-term starting. Therefore, the system and the method for automatically regulating the voltage of the double power supplies based on the high-efficiency filtering unit are found, the bus voltage fluctuation caused by the system voltage fluctuation and the starting and stopping of the high-capacity auxiliary machine can be identified and filtered, the bus voltage can be automatically regulated, and the system and the method have very important significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a dual-power-supply automatic voltage regulating system and method based on a high-efficiency filtering unit, which can identify and filter the voltage fluctuation of a bus caused by the fluctuation of the system voltage and the start and stop of a high-capacity auxiliary machine and can realize the automatic regulation of the high-voltage bus voltage.
In order to achieve the purpose, the dual-power-supply automatic voltage regulating system based on the high-efficiency filtering unit comprises a high-voltage-plant-transformer on-load voltage regulating unit, a working power supply inlet common-box bus, a working power supply inlet circuit breaker, a working power supply inlet common-box bus current transformer, a high-voltage bus, a standby transformer on-load voltage regulating unit, a standby power supply inlet common-box bus, a standby power supply inlet circuit breaker, a standby power supply inlet current transformer and a bus voltage automatic regulating unit;
the high-voltage plant transformer on-load voltage regulation unit is connected with the high-voltage bus sequentially through a working power supply inlet common box bus, a working power supply inlet circuit breaker and a working power supply inlet common box bus current transformer, and the standby transformer on-load voltage regulation unit is connected with the high-voltage bus sequentially through a standby power supply inlet common box bus, a standby power supply inlet circuit breaker and a standby power supply inlet current transformer;
a working power supply inlet wire voltage transformer for detecting the voltage on the working power supply inlet wire common box bus is arranged around the working power supply inlet wire common box bus; a bus voltage transformer for detecting the voltage on the high-voltage bus is arranged around the high-voltage bus; a standby power supply inlet wire voltage transformer for detecting the voltage on the standby power supply inlet wire common box bus is arranged around the standby power supply inlet wire common box bus;
the bus voltage automatic regulating unit is connected with a position node of the standby power supply incoming line circuit breaker, a position node of the working power supply incoming line circuit breaker, the high-station transformer on-load voltage regulating unit, the working power supply incoming line voltage transformer, the working power supply incoming line common box bus current transformer, the high-voltage bus voltage transformer, the standby transformer on-load voltage regulating unit, the standby power supply incoming line voltage transformer and the standby power supply incoming line current transformer.
The invention relates to a double-power-supply automatic voltage regulating method based on a high-efficiency filtering unit, which comprises the following steps:
1) starting the bus voltage automatic regulating unit, and debugging the bus voltage automatic regulating unit;
2) presetting a bus voltage range;
3) a bus voltage transformer collects the bus voltage of a high-voltage bus;
4) the bus voltage automatic regulating unit filters the collected bus voltage and screens out bus voltage fluctuation caused by system voltage fluctuation or starting and stopping of a high-capacity auxiliary machine;
5) comparing the collected bus voltage with a preset bus voltage range, and turning to the step 9 when the collected bus voltage is larger than the upper limit of the preset bus voltage range); when the collected bus voltage is smaller than the lower limit of the preset bus voltage range, turning to the step 6); when the collected bus voltage is within the preset bus voltage range, turning to step 12);
6) when the current high-voltage bus is supplied with power by the high-voltage plant transformer on-load voltage regulation unit, turning to step 7); when the current high-voltage bus is powered by the standby transformer on-load voltage regulation unit, turning to the step 8);
7) the bus voltage automatic regulating unit sends a boosting instruction to the high-voltage substation on-load voltage regulating unit, so that the high-voltage substation on-load voltage regulating unit downshifts once, and the step 3 is carried out after the new gear of the high-voltage substation on-load voltage regulating unit is stabilized;
8) the bus voltage automatic regulating unit sends a boosting instruction to the standby transformer on-load voltage regulating unit, so that the standby transformer on-load voltage regulating unit downshifts once, and the step 3 is carried out after the new gear of the standby transformer on-load voltage regulating unit is stabilized;
9) when the current high-voltage bus is supplied with power by the high-voltage plant transformer on-load voltage regulation unit, turning to the step 10); when the current high-voltage bus is powered by the standby transformer on-load voltage regulation unit, turning to the step 11);
10) the bus voltage automatic regulating unit sends a voltage reduction instruction to the high-voltage substation on-load voltage regulating unit, so that the high-voltage substation on-load voltage regulating unit is shifted up once, and the step 3 is carried out after the high-voltage substation on-load voltage regulating unit is stabilized at a new shift position;
11) the automatic bus voltage regulating unit sends a voltage reduction instruction to the standby transformer on-load voltage regulating unit, so that the standby transformer on-load voltage regulating unit is shifted up once, and the step 3 is carried out after the new shift of the standby transformer on-load voltage regulating unit is stabilized;
12) and finishing the bus voltage adjustment of the high-voltage bus.
The specific operation of the step 1) is as follows:
101) starting a bus voltage automatic regulating unit, and carrying out static debugging on the high-voltage substation on-load voltage regulating unit and the standby substation on-load voltage regulating unit;
102) remote transmission of the high-voltage plant transformer on-load voltage regulation unit and the standby transformer on-load voltage regulation unit is completed;
103) the transmission of the working power supply incoming line breaker and the standby power supply incoming line breaker is completed, wherein the position node of the working power supply incoming line breaker and the position node of the standby power supply incoming line breaker are accurately indicated on the picture; the working power supply incoming line voltage transformer, the standby power supply incoming line voltage transformer and the bus voltage transformer output correctly on site, the analog quantity signals of the secondary voltages of the working power supply incoming line voltage transformer, the standby power supply incoming line voltage transformer and the bus voltage transformer, which are sent to the bus voltage automatic regulating unit through the transmitters, are accurate and correct, and the analog quantity signals of the secondary currents of the working power supply incoming line common box bus current transformer and the standby power supply incoming line current transformer, which are sent to the bus voltage automatic regulating unit through the transmitters, are accurate and correct;
104) the bus voltage automatic regulating unit has normal functions of analog quantity acquisition, efficient filtering, state quantity acquisition, bus voltage range setting, logic judgment, voltage boosting, voltage reduction, alarm module and picture display.
In the step 2), the upper limit of the bus voltage range is less than 1.05 times of the rated voltage of the high-voltage bus and is greater than the lower limit of the bus voltage range plus the voltage regulation range of the on-load voltage regulation first gear, so that the voltage of the high-voltage bus is prevented from entering a dead zone during adjustment;
the lower limit of the bus voltage range is more than or equal to 0.95 times of the rated voltage of the high-voltage bus and is less than the upper limit of the bus voltage range, namely the voltage regulation range of the on-load voltage regulation first gear, so that the dead zone is avoided when the voltage of the high-voltage bus is regulated.
The specific operation of the step 4) is as follows:
the bus voltage automatic regulating unit filters the collected bus voltage to filter burrs and eliminate the influence of motor starting and system voltage fluctuation on the bus voltage.
The specific operation of step 6) is:
judging whether the working power supply incoming line breaker is in a closing state or not by utilizing a closing position of the working power supply incoming line breaker and a current on the working power supply incoming line common box bus detected by a working power supply incoming line common box bus current transformer, and when the working power supply incoming line breaker is in the closing state, judging that the working power supply incoming line breaker is in the closing state if the current on the working power supply incoming line common box bus is more than or equal to 0.1 time of the rated current of the working power supply incoming line breaker; when the working power supply incoming line breaker is in an open position, and the current on the working power supply incoming line common box bus is less than or equal to 0.1 time of the rated current of the working power supply incoming line breaker, the working power supply incoming line breaker is considered to be in an open state; when the working power supply inlet wire breaker is in the branch position, the current on the working power supply inlet wire common box bus is greater than 0.1 time of the rated current of the working power supply inlet wire breaker, and the working power supply inlet wire breaker is considered to have abnormal conditions.
The specific operation of step 9) is:
judging whether the standby power incoming line breaker is in a closing state or not by utilizing the closing position of the standby power incoming line breaker and the current on the standby power incoming line common box bus detected by the standby power incoming line current transformer, and when the standby power incoming line breaker is in the closing state, judging that the standby power incoming line breaker is in the closing state if the current on the standby power incoming line common box bus is more than or equal to 0.1 time of the rated current of the standby power incoming line breaker; when the standby power supply incoming line breaker is in an open position, and the current on the bus of the standby power supply incoming line common box is less than or equal to 0.1 time of the rated current of the standby power supply incoming line breaker, the standby power supply incoming line breaker is considered to be in an open state; when the standby power supply inlet wire breaker is in a branch position, the current on the standby power supply inlet wire common box bus is greater than 0.1 time of the rated current of the standby power supply inlet wire breaker, and the standby power supply inlet wire breaker is considered to have an abnormal condition.
When the working power supply incoming line breaker is in a switching-on state and the standby power supply incoming line breaker is in a switching-off state, the high-voltage plant transformer on-load voltage regulation unit is considered to supply power to the high-voltage bus; when the working power supply incoming line breaker is in an opening state and the standby power supply incoming line breaker is in a closing state, the standby transformer on-load voltage regulation unit is considered to supply power to the high-voltage bus; when the working power supply incoming line breaker and the standby power supply incoming line breaker are both in a closing state, a fault is considered to occur, and the bus voltage automatic regulating unit locks on-load voltage regulation; when the working power supply incoming line breaker and the standby power supply incoming line breaker are both in the opening state, the bus voltage automatic regulating unit locks the on-load voltage regulation.
The invention has the following beneficial effects:
the dual-power automatic voltage regulating system and method based on the high-efficiency filtering unit collect the bus voltage of a high-voltage bus through the bus voltage transformer during specific operation; filtering the collected bus voltage through a bus voltage automatic adjusting unit, and screening out bus voltage fluctuation caused by system voltage fluctuation or starting and stopping of a high-capacity auxiliary machine; in addition, the collected bus voltage is compared with the preset bus voltage range, and the voltage of the high-voltage on-load voltage regulating unit or the high-voltage on-load voltage regulating unit is regulated according to the comparison result, so that the automatic regulation of the high-voltage bus voltage is realized, the judgment on the running state of the system is accurate and reliable, the frequent starting of the on-load voltage regulating device caused by interference is avoided, and the voltage regulating operation can be automatically carried out according to the set value of an operator until the bus voltage runs to a reasonable interval. The on-load voltage regulation device has the advantages that the work of operators is reduced, the operation period of the on-load voltage regulation device is effectively prolonged, the on-load voltage regulation device is suitable for automatic bus voltage regulation work of buses adopting single power supply incoming lines, double power supply incoming lines and even multiple power supply incoming lines, and the on-load voltage regulation device is used for protecting and navigating stable operation of a high-voltage station power supply.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a block diagram of the bus bar automatic voltage regulating unit of the present invention;
FIG. 4 is a schematic diagram of filtering in the present invention;
fig. 5 is a graph showing the comparative effect before and after filtering in the present invention.
Wherein, 1 is a high-voltage plant transformer on-load voltage regulation unit, and 2 is a working power supply inlet common-box bus; the system comprises a working power supply incoming line voltage transformer 3, a working power supply incoming line breaker 4, a position node of the working power supply incoming line breaker 5, a working power supply incoming line common box bus current transformer 6, a high-voltage bus 7, a bus voltage transformer 8, a standby power supply incoming line current transformer 9, a position node of a standby power supply incoming line breaker 10, a standby power supply incoming line breaker 11, a standby power supply incoming line common box bus 12, a standby power supply incoming line voltage transformer 13, a standby on-load voltage regulation unit 14 and a bus voltage automatic regulation unit 15.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 2 and 3, the dual-power-supply automatic voltage regulation system based on the high-efficiency filter unit comprises a high-voltage-plant-transformer on-load voltage regulation unit 1, a working power supply incoming line common box bus 2, a working power supply incoming line breaker 4, a working power supply incoming line common box bus current transformer 6, a high-voltage bus 7, a standby transformer on-load voltage regulation unit 14, a standby power supply incoming line common box bus 12, a standby power supply incoming line breaker 11, a standby power supply incoming line current transformer 9 and a bus voltage automatic regulation unit 15; the high-voltage plant transformer on-load voltage regulation unit 1 is sequentially connected with a high-voltage bus 7 through a working power supply inlet common box bus 2, a working power supply inlet circuit breaker 4 and a working power supply inlet common box bus current transformer 6, and the standby transformer on-load voltage regulation unit 14 is sequentially connected with the high-voltage bus 7 through a standby power supply inlet common box bus 12, a standby power supply inlet circuit breaker 11 and a standby power supply inlet current transformer 9; a working power supply inlet wire voltage transformer 3 for detecting the voltage on the working power supply inlet wire common box bus 2 is arranged around the working power supply inlet wire common box bus 2; a bus voltage transformer 8 for detecting the voltage on the high-voltage bus 7 is arranged around the high-voltage bus 7; a standby power supply inlet line voltage transformer 13 for detecting the voltage on the standby power supply inlet line common box bus 12 is arranged around the standby power supply inlet line common box bus 12; the bus voltage automatic regulating unit 15 is connected with a position node 10 of the standby power supply incoming line breaker, a position node 5 of the working power supply incoming line breaker, a high-voltage plant transformer on-load voltage regulating unit 1, a working power supply incoming line voltage transformer 3, a working power supply incoming line common box bus current transformer 6, a high-voltage bus voltage transformer 8, a standby transformer on-load voltage regulating unit 14, a standby power supply incoming line voltage transformer 13 and a standby power supply incoming line current transformer 9.
Referring to fig. 1, the dual power supply automatic voltage regulation method based on the high-efficiency filter unit of the invention comprises the following steps:
1) starting the bus voltage automatic regulating unit 15, debugging the bus voltage automatic regulating unit 15, and entering the step 2) without alarming and locking;
2) presetting a bus voltage range;
3) a bus voltage transformer 8 collects the bus voltage of the high-voltage bus 7;
4) the bus voltage automatic regulating unit 15 filters the collected bus voltage to screen out bus voltage fluctuation caused by system voltage fluctuation or start and stop of a high-capacity auxiliary machine;
5) comparing the collected bus voltage with a preset bus voltage range, and turning to the step 9 when the collected bus voltage is larger than the upper limit of the preset bus voltage range); when the collected bus voltage is smaller than the lower limit of the preset bus voltage range, turning to the step 6); when the collected bus voltage is within the preset bus voltage range, turning to step 12);
6) when the current high-voltage bus 7 is powered by the high-voltage plant transformer on-load voltage regulation unit 1, turning to the step 7); when the current high-voltage bus 7 is powered by the standby transformer on-load voltage regulation unit 14, turning to step 8);
7) the bus voltage automatic regulating unit 15 sends a boosting instruction to the high-voltage substation on-load voltage regulating unit 1, so that the high-voltage substation on-load voltage regulating unit 1 downshifts once, and the step 3 is carried out after the high-voltage substation on-load voltage regulating unit 1 is stabilized at a new gear;
8) the bus voltage automatic regulating unit 15 sends a boosting instruction to the standby transformer on-load voltage regulating unit 14, so that the standby transformer on-load voltage regulating unit 14 downshifts once, and the step 3 is performed after the new gear of the standby transformer on-load voltage regulating unit 14 is stabilized;
9) when the current high-voltage bus 7 is powered by the high-voltage plant transformer on-load voltage regulation unit 1, turning to the step 10); when the current high-voltage bus 7 is powered by the standby transformer on-load voltage regulation unit 14, turning to step 11);
10) the bus voltage automatic regulating unit 15 sends a voltage reduction instruction to the high-voltage substation on-load voltage regulating unit 1, so that the high-voltage substation on-load voltage regulating unit 1 is shifted up once, and the step 3 is carried out after the high-voltage substation on-load voltage regulating unit 1 is stabilized at a new gear;
11) the bus voltage automatic regulating unit 15 sends a voltage reduction instruction to the standby transformer on-load voltage regulating unit 14, so that the standby transformer on-load voltage regulating unit 14 is shifted up once, and the step 3 is performed after the new gear of the standby transformer on-load voltage regulating unit 14 is stabilized;
12) and finishing the bus voltage adjustment of the high-voltage bus 7.
The specific operation of the step 1) is as follows:
101) starting a bus voltage automatic regulating unit 15, and performing static debugging on the high-voltage plant transformer on-load voltage regulating unit 1 and the standby transformer on-load voltage regulating unit 14, wherein the static debugging comprises complete on-load voltage regulating device power supplies, normal in-situ voltage boosting and reducing functions and normal emergency stop function; the local gear indication is correct; the vacuum oil filter works normally.
102) The remote transmission of the high-voltage plant transformer on-load voltage regulation unit 1 and the standby transformer on-load voltage regulation unit 14 is completed, and the functions of voltage increase and reduction and emergency stop of the bus voltage automatic regulation unit 15 are normal; the signal transmitted from the on-load voltage regulation device to the bus voltage automatic regulation unit 15 is accurate: the bus voltage automatic regulating unit 15 sends an accurate instruction to the on-load voltage regulating device;
103) completing the transmission of a working power supply incoming line breaker 4 and a standby power supply incoming line breaker 11, wherein a position node 5 of the working power supply incoming line breaker and a position node 10 of the standby power supply incoming line breaker are accurately indicated on a picture; the working power supply inlet wire voltage transformer 3, the standby power supply inlet wire voltage transformer 13 and the high-voltage bus voltage transformer 8 output correctly on site, the analog quantity signals of the secondary voltages of the working power supply inlet wire voltage transformer 3, the standby power supply inlet wire voltage transformer 13 and the high-voltage bus voltage transformer 8 which are sent to the bus voltage automatic regulating unit 15 through the transmitters are accurate and correct, and the analog quantity signals of the secondary currents of the working power supply inlet wire common box bus current transformer 6 and the standby power supply inlet wire current transformer 9 which are sent to the bus voltage automatic regulating unit 15 through the transmitters are accurate and correct;
104) the bus voltage automatic regulating unit 15 has normal functions of analog quantity acquisition, efficient filtering, state quantity acquisition, bus voltage range setting, logic judgment, voltage boosting, voltage reduction, alarm module and picture display.
In the step 2), the upper limit of the bus voltage range is less than 1.05 times of the rated voltage of the high-voltage bus 7 and is greater than the lower limit of the bus voltage range and the voltage regulation range of on-load voltage regulation, so that the voltage of the high-voltage bus 7 is prevented from entering a dead zone during voltage regulation;
the lower limit of the bus voltage range is more than or equal to 0.95 times of the rated voltage of the bus and less than the upper limit-on-load voltage regulation one-gear voltage regulation range of the bus voltage range, so that the voltage of the high-voltage bus 7 is prevented from entering a dead zone during voltage regulation.
The specific operation of the step 4) is as follows: the bus voltage automatic regulating unit 15 filters the collected bus voltage to filter burrs and eliminate the influence of motor starting and system voltage fluctuation on the bus voltage.
Referring to fig. 4 and 5, in this example, in order to eliminate the interference of the start and stop of the large auxiliary machine on the automatic voltage regulation, a LEAD/LAG module is introduced for the control of the automatic voltage regulation, the output value of the LEAD/LAG module is a function of the old output, the old input, the new input, the LEAD and LAG time constants, the LEAD/LAG module has a filtering function, partial disturbance can be effectively removed, and the rejection caused by simple signal delay does not occur, so that the output of the function block is led or lagged behind the change of the input signal, and the following equation describes the operation mode thereof:
wherein X is a current input value; XL is an input value of a previous operation period; t1 is the value (in seconds) of the lead time constant T1; t2 is the value of the lag time constant T2 in seconds; y is the current output value; YL is the output value of the last operation period; dt is the module cycle time (seconds).
Using its lag function to make the lead time 0, the above equation is simplified to:
as can be seen from the above formula, the larger T2 is, the smaller the influence of the change on the current output Y is, the more obvious the filtering effect is, and when T2 is1＜T22The input and output are shown in fig. 3. Therefore, the proper T2 lag time is selected, the influence of voltage signal disturbance on the voltage increasing and decreasing judgment of the voltage regulating system can be effectively avoided, the delay effect is only achieved on the single increasing/decreasing of the real voltage, and the final action condition is not influenced.
The specific operation of step 6) is:
judging whether the working power supply incoming line breaker 4 is in a closing state or not by utilizing the closing position of the working power supply incoming line breaker 4 and the current on the working power supply incoming line common box bus 2 detected by the working power supply incoming line common box bus current transformer 6, and when the working power supply incoming line breaker 4 is in the closing state, judging that the working power supply incoming line breaker 4 is in the closing state if the current on the working power supply incoming line common box bus 2 is more than or equal to 0.1 time of the rated current of the working power supply incoming line breaker 4; when the working power supply incoming line breaker 4 is in an open position, the current on the working power supply incoming line common box bus 2 is less than or equal to 0.1 time of the rated current of the working power supply incoming line breaker 4, and the working power supply incoming line breaker 4 is considered to be in an open state; when the working power supply incoming line breaker 4 is in a branch position, the current on the working power supply incoming line common box bus 2 is greater than 0.1 time of the rated current of the working power supply incoming line breaker 4, and then the working power supply incoming line breaker 4 is considered to have an abnormal condition.
The specific operation of step 9) is:
judging whether the standby power incoming line breaker 11 is in a closing state or not by utilizing the closing position of the standby power incoming line breaker 11 and the current on the standby power incoming line common box bus 12 detected by the standby power incoming line current transformer 9, and when the standby power incoming line breaker 11 is in the closing state, judging that the standby power incoming line breaker 11 is in the closing state if the current on the standby power incoming line common box bus 12 is more than or equal to 0.1 time of the rated current of the standby power incoming line breaker 11; when the standby power incoming line breaker 11 is in an open position, and the current on the standby power incoming line common box bus 12 is less than or equal to 0.1 time of the rated current of the standby power incoming line breaker 11, the standby power incoming line breaker 11 is considered to be in an open state; when the standby power supply incoming line breaker 11 is in a branch position, the current of the standby power supply incoming line common box bus 12 is greater than 0.1 time of the rated current of the standby power supply incoming line breaker 11, and the standby power supply incoming line breaker 11 is considered to have an abnormal condition.
When the working power supply incoming line breaker 4 is in a switching-on state and the standby power supply incoming line breaker 11 is in a switching-off state, the high-voltage plant transformer on-load voltage regulation unit 1 is considered to supply power to the high-voltage bus 7; when the working power supply incoming line breaker 4 is in an opening state and the standby power supply incoming line breaker 11 is in a closing state, the standby transformer on-load voltage regulation unit 14 is considered to supply power to the high-voltage bus 7; when the working power supply incoming line breaker 4 and the standby power supply incoming line breaker 11 are both in a closing state, a fault is considered to occur, and the bus voltage automatic regulating unit 15 locks on-load voltage regulation; when the working power supply incoming line breaker 4 and the standby power supply incoming line breaker 11 are both in the open state, the bus voltage automatic regulating unit 15 locks the on-load voltage regulation.
In the embodiment, when the voltage of the high-voltage bus 7 is automatically regulated, a LEAD/LAG module is introduced to filter the bus voltage sampling value, and frequent starting of the on-load voltage regulation device caused by power grid fluctuation and starting and stopping of a large-scale high-capacity auxiliary machine is eliminated.
The invention adopts the mode of combining the position of the working power supply inlet wire breaker 4 and the inlet wire current to judge the running state of the working power supply inlet wire breaker 4, and the method is reliable and has high accuracy; furthermore, the transformer needing voltage regulation is determined by judging the running states of the working power supply inlet wire breaker 4 and the standby power supply inlet wire breaker 11, and the on-load voltage regulation is locked for abnormal running states and has an alarm function.
The invention sets the upper limit value and the lower limit value of the bus voltage operation according to the operation experience of the bus voltage operation, wherein the upper limit value is not more than 1.05 times of the rated voltage, the lower limit value is not less than 0.95 times of the rated voltage, and the difference value between the upper limit value and the lower limit value is larger than the voltage difference corresponding to the first gear adjustment of the on-load voltage regulating device, thereby effectively avoiding the abnormal operation of the service power and the adjustment from entering a dead zone.
The invention filters the collected bus voltage, eliminates the fluctuation of the bus voltage caused by the start and stop of a high-capacity auxiliary machine and the fluctuation of a power grid, avoids the frequent start of the on-load voltage regulation device and effectively increases the service cycle of the on-load voltage regulation device.
The invention has strong practicability, can be applied to a bus voltage automatic voltage regulating system of a single power supply, a double power supply or even a plurality of power supplies, and can automatically identify a transformer needing voltage regulation by an operator, automatically execute a voltage boosting instruction and a voltage reducing instruction until a reasonable operation interval is reached; the application of the high-efficiency filtering module can effectively reduce the frequent starting of the on-load voltage regulation device, and the service life of the on-load voltage regulation device is prolonged. The high-voltage bus 7 voltage stabilizing device is suitable for power plants with different wiring modes and large factories and mines, ensures stable voltage of the high-voltage bus, and protects driving for stable operation of the factory power.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (1)
1. A dual-power automatic voltage regulation method based on an efficient filtering unit is characterized in that a dual-power automatic voltage regulation system based on the efficient filtering unit comprises a high-voltage plant transformer on-load voltage regulation unit (1), a working power inlet common box bus (2), a working power inlet circuit breaker (4), a working power inlet common box bus current transformer (6), a high-voltage bus (7), a standby transformer on-load voltage regulation unit (14), a standby power inlet common box bus (12), a standby power inlet circuit breaker (11), a standby power inlet current transformer (9) and a bus voltage automatic regulation unit (15);
the high-voltage plant transformer on-load voltage regulation unit (1) is sequentially connected with a high-voltage bus (7) through a working power supply inlet common box bus (2), a working power supply inlet circuit breaker (4) and a working power supply inlet common box bus current transformer (6), and the standby transformer on-load voltage regulation unit (14) is sequentially connected with the high-voltage bus (7) through a standby power supply inlet common box bus (12), a standby power supply inlet circuit breaker (11) and a standby power supply inlet current transformer (9);
a working power supply inlet wire voltage transformer (3) for detecting the voltage on the working power supply inlet wire common box bus (2) is arranged around the working power supply inlet wire common box bus (2); a bus voltage transformer (8) for detecting the voltage on the high-voltage bus (7) is arranged around the high-voltage bus (7); a standby power supply inlet wire voltage transformer (13) for detecting the voltage on the standby power supply inlet wire common box bus (12) is arranged around the standby power supply inlet wire common box bus (12);
the bus voltage automatic regulating unit (15) is connected with a position node (10) of a standby power supply incoming line breaker, a position node (5) of a working power supply incoming line breaker, a high-voltage plant transformer on-load voltage regulating unit (1), a working power supply incoming line voltage transformer (3), a working power supply incoming line common box bus current transformer (6), a high-voltage bus voltage transformer (8), a startup transformer on-load voltage regulating unit (14), a standby power supply incoming line voltage transformer (13) and a standby power supply incoming line current transformer (9);
the method comprises the following steps:
1) starting the bus voltage automatic regulating unit (15) and debugging the bus voltage automatic regulating unit (15);
2) presetting a bus voltage range;
3) a bus voltage transformer (8) collects the bus voltage of a high-voltage bus (7);
4) the bus voltage automatic regulating unit (15) filters the collected bus voltage to screen out bus voltage fluctuation caused by system voltage fluctuation or starting and stopping of a high-capacity auxiliary machine;
5) comparing the collected bus voltage with a preset bus voltage range, and turning to the step 9 when the collected bus voltage is larger than the upper limit of the preset bus voltage range); when the collected bus voltage is smaller than the lower limit of the preset bus voltage range, turning to the step 6); when the collected bus voltage is within the preset bus voltage range, turning to step 12);
6) when the current high-voltage bus (7) is supplied with power by the high-voltage plant-to-load voltage regulation unit (1), turning to step 7); when the current high-voltage bus (7) is powered by the standby transformer on-load voltage regulation unit (14), turning to step 8);
7) the bus voltage automatic regulating unit (15) sends a boosting instruction to the high-voltage substation on-load voltage regulating unit (1), so that the high-voltage substation on-load voltage regulating unit (1) downshifts once, and the step 3 is carried out after the new gear of the high-voltage substation on-load voltage regulating unit (1) is stable;
8) the bus voltage automatic regulating unit (15) sends a boosting instruction to the standby transformer on-load voltage regulating unit (14), so that the standby transformer on-load voltage regulating unit (14) downshifts once, and the step 3 is carried out after the new gear of the standby transformer on-load voltage regulating unit (14) is stable;
9) when the current high-voltage bus (7) is supplied with power by the high-voltage plant transformer on-load voltage regulation unit (1), turning to the step 10); when the current high-voltage bus (7) is powered by the standby transformer on-load voltage regulation unit (14), turning to step 11);
10) the bus voltage automatic regulating unit (15) sends a voltage reduction instruction to the high-voltage substation on-load voltage regulating unit (1), so that the high-voltage substation on-load voltage regulating unit (1) is shifted up once, and the step 3 is switched to after the new shift of the high-voltage substation on-load voltage regulating unit (1) is stable;
11) the bus voltage automatic regulating unit (15) sends a voltage reduction instruction to the standby transformer on-load voltage regulating unit (14), so that the standby transformer on-load voltage regulating unit (14) is shifted up once, and the step 3 is carried out after the new shift of the standby transformer on-load voltage regulating unit (14) is stable;
12) finishing the bus voltage adjustment of the high-voltage bus (7);
the specific operation of the step 1) is as follows:
101) starting a bus voltage automatic regulating unit (15) and carrying out static debugging on the high-voltage plant transformer on-load voltage regulating unit (1) and the standby transformer on-load voltage regulating unit (14);
102) the remote transmission of the high-station transformer on-load voltage regulation unit (1) and the standby transformer on-load voltage regulation unit (14) is completed;
103) the transmission of a working power supply incoming line breaker (4) and a standby power supply incoming line breaker (11) is completed, wherein the position node (5) of the working power supply incoming line breaker and the position node (10) of the standby power supply incoming line breaker are accurately indicated on the picture; the working power supply incoming line voltage transformer (3), the standby power supply incoming line voltage transformer (13) and the bus voltage transformer (8) output correctly on site, the analog quantity signals of the secondary voltages of the working power supply incoming line voltage transformer (3), the standby power supply incoming line voltage transformer (13) and the bus voltage transformer (8) which are sent to the bus voltage automatic regulating unit (15) through the transmitters are accurate and correct, and the analog quantity signals of the secondary currents of the working power supply incoming line common box bus current transformer (6) and the standby power supply incoming line current transformer (9) which are sent to the bus voltage automatic regulating unit (15) through the transmitters are accurate and correct;
104) the functions of analog quantity acquisition, efficient filtering, state quantity acquisition, bus voltage range setting, logic judgment, boosting, voltage reduction, alarm module and picture display of the bus voltage automatic adjusting unit (15) are normal;
in the step 2), the upper limit of the bus voltage range is less than 1.05 times of the rated voltage of the high-voltage bus (7), and is greater than the lower limit of the bus voltage range and the voltage regulation range of the on-load voltage regulation first gear, so that the voltage of the high-voltage bus (7) is prevented from entering a dead zone during adjustment;
the lower limit of the bus voltage range is more than or equal to 0.95 times of the rated voltage of the high-voltage bus (7) and is less than the upper limit of the bus voltage range, namely the voltage regulation range of on-load voltage regulation at first gear, so that the voltage of the high-voltage bus (7) is prevented from entering a dead zone during regulation;
the specific operation of the step 4) is as follows:
the bus voltage automatic regulating unit (15) filters the collected bus voltage to filter burrs and eliminate the influence of motor starting and system voltage fluctuation on the bus voltage;
the specific operation of step 6) is:
judging whether the working power supply incoming line breaker (4) is in a closing state or not by utilizing the closing position of the working power supply incoming line breaker (4) and the current on the working power supply incoming line common box bus (2) detected by the working power supply incoming line common box bus current transformer (6), and when the working power supply incoming line breaker (4) is in the closing state, judging that the working power supply incoming line breaker (4) is in the closing state if the current on the working power supply incoming line common box bus (2) is more than or equal to 0.1 time of the rated current of the working power supply incoming line breaker (4); when the working power supply incoming line breaker (4) is in an open position, the current on the working power supply incoming line common box bus (2) is less than or equal to 0.1 time of the rated current of the working power supply incoming line breaker (4), and the working power supply incoming line breaker (4) is considered to be in an open state; when the working power supply inlet line breaker (4) is in a separated position, the current on the working power supply inlet line common box bus (2) is greater than 0.1 time of the rated current of the working power supply inlet line breaker (4), and the working power supply inlet line breaker (4) is considered to have an abnormal condition;
the specific operation of step 9) is:
judging whether the standby power incoming line breaker (11) is in a closing state or not by utilizing the closing position of the standby power incoming line breaker (11) and the current on the standby power incoming line common box bus (12) detected by the standby power incoming line current transformer (9), and when the standby power incoming line breaker (11) is in the closing state, judging that the standby power incoming line breaker (11) is in the closing state if the current on the standby power incoming line common box bus (12) is more than or equal to 0.1 time of the rated current of the standby power incoming line breaker (11); when the standby power supply incoming line breaker (11) is in an open position, and the current on the standby power supply incoming line common box bus (12) is less than or equal to 0.1 time of the rated current of the standby power supply incoming line breaker (11), the standby power supply incoming line breaker (11) is considered to be in an open state; when the standby power supply incoming line breaker (11) is in a branch position, and the current on the standby power supply incoming line common box bus (12) is greater than 0.1 time of the rated current of the standby power supply incoming line breaker (11), the standby power supply incoming line breaker (11) is considered to have an abnormal condition;
when the working power supply incoming line breaker (4) is in a switching-on state and the standby power supply incoming line breaker (11) is in a switching-off state, the high-voltage plant transformer on-load voltage regulation unit (1) is considered to supply power to the high-voltage bus (7); when the working power supply incoming line breaker (4) is in an opening state and the standby power supply incoming line breaker (11) is in a closing state, the standby transformer on-load voltage regulation unit (14) is considered to supply power to the high-voltage bus (7); when the working power supply incoming line breaker (4) and the standby power supply incoming line breaker (11) are both in a closing state, a fault is considered to occur, and the bus voltage automatic regulating unit (15) locks on-load voltage regulation; when the working power supply incoming line breaker (4) and the standby power supply incoming line breaker (11) are both in the open state, the bus voltage automatic regulating unit (15) locks the on-load voltage regulation.
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| JP3907998B2 (en) * | 2001-02-09 | 2007-04-18 | 株式会社東芝 | Substation protection control system |
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| CN101719688A (en) * | 2009-12-18 | 2010-06-02 | 江苏金智科技股份有限公司 | Starting method for industrial enterprise power supply rapid switching device based on power direction |
| CN202068231U (en) * | 2011-06-18 | 2011-12-07 | 内蒙古电力勘测设计院 | Standby power wiring structure with voltage regulating function used for station |
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