CN116995796A - Peak Gu Tao benefit control method for high-voltage energy-storage frequency converter - Google Patents
Peak Gu Tao benefit control method for high-voltage energy-storage frequency converter Download PDFInfo
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- CN116995796A CN116995796A CN202311047567.XA CN202311047567A CN116995796A CN 116995796 A CN116995796 A CN 116995796A CN 202311047567 A CN202311047567 A CN 202311047567A CN 116995796 A CN116995796 A CN 116995796A
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- energy storage
- frequency converter
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- voltage energy
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- 238000004146 energy storage Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000008901 benefit Effects 0.000 title description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims description 8
- 239000003245 coal Substances 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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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
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
-
- 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
- H02J9/062—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 for AC powered loads
Abstract
The invention provides a method for controlling peak Gu Tao of a high-voltage energy-storage frequency converter, which belongs to the technical field of energy-storage frequency converters and comprises the following steps: the main control of the high-voltage energy-storage frequency converter can control the charge and discharge of the energy storage battery through electricity price peak time period division, and meanwhile, the main control adjusts the power frequency and frequency conversion running state of the load motor through judging the power of the uncontrolled rectifying side. The invention can realize peak-valley arbitrage function of the high-voltage energy-storage frequency converter under the condition of ensuring uninterrupted operation of the load motor, reduce electricity cost on the basis of uninterrupted power supply of important motor load in coal industry and the like, and effectively improve the operation economy of the high-voltage energy-storage frequency conversion system.
Description
Technical Field
The invention belongs to the technical field of energy storage frequency converters, and particularly relates to a peak Gu Tao benefit control method of a high-voltage energy storage frequency converter.
Background
In recent years, along with the rapid development of power electronic technology and alternating current transmission control technology, high-voltage variable-frequency speed regulation systems are increasingly widely applied. Especially in the colliery consumer, important equipment such as main ventilation blower can lead to oxygen in the pit to be insufficient if the outage time is too long, can lead to the gas content to exceed the standard. Therefore, no impact current is required when the load motor is started, and the power supply reliability of the coal mine electric equipment can be ensured once the load motor is put into on-site production and is not allowed to stop.
The frequency converters existing in the current market are all in a power supply mode of directly accessing a power grid, and the continuous uninterrupted operation of the system is ensured by matching the frequency converters with energy storage of large capacity for a long time. The high-voltage energy-storage frequency converter can realize fast switching after power failure of a coal mine system, and ensure safe operation of the system. However, a single operation mode cannot ensure the operation economy of the whole system, and larger resource waste and capital loss can be generated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for controlling the peak Gu Tao of a high-voltage energy-storage frequency converter so as to solve the technical problems.
The invention provides a method for controlling peak Gu Tao of a high-voltage energy-storage frequency converter, which comprises the following steps:
acquiring an electricity price peak-valley time interval standard, determining a charging and discharging state of an energy storage battery in the voltage energy storage frequency converter according to the standard, controlling the high-voltage energy storage frequency converter to operate in a charging state in a non-peak time interval and operate in a discharging state in a peak time interval;
when the high-voltage energy storage frequency converter operates in an off-peak period, the system can judge whether the charging power of the energy storage battery and the consumed power of the load motor exceed the rated power of uncontrolled rectification, and when the sum of the charging power and the consumed power exceeds the rated power, a power frequency command is issued to switch the load motor into power frequency operation;
when the frequency conversion is switched to power frequency, the voltage of the power grid is monitored in real time, the phase-locked loop is used for adjusting the output amplitude phase of the high-voltage energy storage frequency converter to be the same as that of the power grid, the bypass is closed firstly, then the main loop is cut off, and finally the high-voltage energy storage frequency converter is controlled to stop.
Further, the method further comprises the following steps: when the variable frequency operation is needed, the high-voltage energy storage frequency converter is controlled to start, meanwhile, the voltage consistent with the power grid is output according to the phase-locked angle amplitude, the bypass is firstly opened, the main loop is closed, and the load motor is switched to the variable frequency state for operation.
Further, the control high-voltage energy storage frequency converter operates in a charging state in an off-peak period and operates in a discharging state in a peak period, and the control high-voltage energy storage frequency converter comprises:
in the off-peak period, the inverter side of the uncontrolled rectifier bridge H bridge of the high-voltage energy-storage frequency converter provides energy to drive the load motor to operate, and meanwhile, the energy-storage battery is charged;
the invention has the beneficial effects that: the high-voltage energy-storage frequency converter can supply power to loads with motors in important occasions such as coal and the like uninterruptedly, and meanwhile, the frequency conversion operation of the loads can be guaranteed; the uncontrolled rectifying side, the energy storage battery and the H-bridge inversion side of the high-voltage energy storage frequency converter can be matched with each other according to different instructions, so that the peak-valley set-benefit function of the system is realized. On the premise of ensuring that the load motor is not powered off, the resource waste and the fund loss are effectively reduced. In addition, the design principle of the invention is reliable, and the invention has great significance on the cost saving of important industries such as coal mine and the like, and has very wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is an overall control schematic of a method of one embodiment of the invention;
fig. 2 is a diagram of control logic for implementing peak valley fill functionality in a method in accordance with an embodiment of the invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The embodiment of the invention provides a peak Gu Tao advantage control method of a high-voltage energy storage frequency converter, which is based on the high-voltage energy storage frequency converter shown in fig. 1, wherein a main loop breaker KM1 is arranged between the high-voltage energy storage frequency converter and a three-phase main loop supplied by the high-voltage energy storage frequency converter, the high-voltage energy storage frequency converter further comprises a voltage and current detection module arranged on a power grid line and used for monitoring the voltage of a power grid in real time, and a main control module is used for giving a control instruction to the high-voltage energy storage frequency converter to finish the peak Gu Tao advantage control method; the motor also comprises a bypass arranged between the power grid and the motor, and a bypass breaker KM2 is arranged on the bypass;
specifically, as shown in fig. 2, the peak Gu Tao control method includes:
acquiring an electricity price peak-valley time interval standard, determining a charging and discharging state of an energy storage battery in the voltage energy storage frequency converter according to the standard, controlling the high-voltage energy storage frequency converter to operate in a charging state in a non-peak time interval and operate in a discharging state in a peak time interval;
when the high-voltage energy storage frequency converter operates in an off-peak period, the system can judge whether the charging power of the energy storage battery and the consumed power of the load motor exceed the rated power of uncontrolled rectification, and when the sum of the charging power and the consumed power exceeds the rated power, a power frequency command is issued to switch the load motor into power frequency operation;
when the frequency conversion is switched to power frequency, the voltage of the power grid is monitored in real time, the phase-locked loop is used for adjusting the output amplitude phase of the high-voltage energy storage frequency converter to be the same as that of the power grid, the bypass is closed firstly, then the main loop is cut off, and finally the high-voltage energy storage frequency converter is controlled to stop.
Specifically, since the high-voltage energy storage frequency converter operates in a charging state in an off-peak period, the high-voltage energy storage frequency converter can realize power frequency or frequency conversion operation, wherein the switching of power frequency conversion and frequency conversion is performed according to whether the rated power of uncontrolled rectification of the high-voltage energy storage frequency converter can supply the charging power of an energy storage battery and the consumed power of a load motor as trigger conditions; after the main control module of the high-voltage energy-storage frequency converter issues a power frequency conversion instruction, the voltage of the power grid is monitored in real time through the voltage and current detection module, the phase-locked loop is used for adjusting the output amplitude phase of the high-voltage energy-storage frequency converter to be the same as the power grid, and a power frequency conversion permission signal is fed back to the PLC. And the PLC controls the closed KM2, then the opened KM1, and controls the high-voltage energy storage frequency converter to stop, so that the frequency conversion to power frequency undisturbed switching process is completed.
Optionally, as an embodiment of the present invention, further includes: when the variable frequency operation is needed, the high-voltage energy storage frequency converter is controlled to start, meanwhile, the voltage consistent with the power grid is output according to the phase-locked angle amplitude, the bypass is firstly opened, the main loop is closed, and the load motor is switched to the variable frequency state for operation.
The switching of the variable frequency to the power frequency is performed according to the instruction of the main control module as a triggering condition; when the master control issues the PLC controller to perform variable frequency operation, the high-voltage energy storage frequency converter is controlled to start, and meanwhile, after the voltage consistent with the power grid is output according to the phase-locked angle amplitude, the PLC controller controls to disconnect KM2 and KM1 to be closed, so that variable frequency operation of the load motor is completed.
When the high-voltage energy storage frequency converter operates in an off-peak period, the system can judge whether the charging power of the energy storage battery and the power consumed by the load motor exceed the rated power of uncontrolled rectification. And the load motor can continue to run within the rated power range, and if the load motor exceeds the rated power, the main control can send a power frequency transferring instruction to cut the load motor into the power frequency to run.
The invention provides a power frequency and variable frequency switching method of a high-voltage energy-storage frequency converter, which can realize seamless switching of states, and the state switching is carried out in a non-peak period (charging), so that peak-valley arbitrage maximization can be ensured.
Optionally, as an embodiment of the present invention, the controlling the high voltage energy storage frequency converter to operate in a charging state during an off-peak period and to operate in a discharging state during a peak period includes: in the off-peak period, the inverter side of the uncontrolled rectifier bridge H bridge of the high-voltage energy-storage frequency converter provides energy to drive the load motor to operate, and meanwhile, the energy-storage battery is charged; and in the peak time period, the high-voltage energy storage frequency converter is disconnected from the uncontrolled rectification high-voltage side, the energy storage battery discharges to the H bridge inversion side, and the energy storage battery drives the load motor to operate.
The master control issuing instruction enables the high-voltage energy storage frequency converter to operate in two states: in the off-peak period, the uncontrolled rectifier bridge of the high-voltage energy storage frequency converter simultaneously provides energy for the inversion side of the H bridge and the energy storage battery, and the energy storage battery is charged while the uninterrupted operation of the load motor is ensured; in the peak period, the main control gives an instruction to disconnect the uncontrolled rectification high-voltage side, and the energy storage battery provides energy for the H-bridge inversion side, so that the normal operation of the load motor is ensured.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention or any person skilled in the art to which the present invention pertains will readily occur to those skilled in the art within the field of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A method for controlling peak Gu Tao of a high voltage energy storage frequency converter, comprising:
acquiring an electricity price peak-valley time interval standard, determining a charging and discharging state of an energy storage battery in the voltage energy storage frequency converter according to the standard, controlling the high-voltage energy storage frequency converter to operate in a charging state in a non-peak time interval and operate in a discharging state in a peak time interval;
when the high-voltage energy storage frequency converter operates in an off-peak period, the system can judge whether the charging power of the energy storage battery and the consumed power of the load motor exceed the rated power of uncontrolled rectification, and when the sum of the charging power and the consumed power exceeds the rated power, a power frequency command is issued to switch the load motor into power frequency operation;
when the frequency conversion is switched to power frequency, the voltage of the power grid is monitored in real time, the phase-locked loop is used for adjusting the output amplitude phase of the high-voltage energy storage frequency converter to be the same as that of the power grid, the bypass is closed firstly, then the main loop is cut off, and finally the high-voltage energy storage frequency converter is controlled to stop.
2. The method as recited in claim 1, further comprising: when the variable frequency operation is needed, the high-voltage energy storage frequency converter is controlled to start, meanwhile, the voltage consistent with the power grid is output according to the phase-locked angle amplitude, the bypass is firstly opened, the main loop is closed, and the load motor is switched to the variable frequency state for operation.
3. The method of claim 1, wherein controlling the high voltage energy storage inverter to operate in a charged state during off-peak periods and to operate in a discharged state during peak periods comprises:
in the off-peak period, the inverter side of the uncontrolled rectifier bridge H bridge of the high-voltage energy-storage frequency converter provides energy to drive the load motor to operate, and meanwhile, the energy-storage battery is charged;
and in the peak time period, the high-voltage energy storage frequency converter is disconnected from the uncontrolled rectification high-voltage side, the energy storage battery discharges to the H bridge inversion side, and the energy storage battery drives the load motor to operate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311047567.XA CN116995796A (en) | 2023-08-21 | 2023-08-21 | Peak Gu Tao benefit control method for high-voltage energy-storage frequency converter |
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| CN202311047567.XA CN116995796A (en) | 2023-08-21 | 2023-08-21 | Peak Gu Tao benefit control method for high-voltage energy-storage frequency converter |
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| CN116995796A true CN116995796A (en) | 2023-11-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117674238A (en) * | 2024-01-31 | 2024-03-08 | 啸驰电气股份有限公司 | Energy storage frequency converter |
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- 2023-08-21 CN CN202311047567.XA patent/CN116995796A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117674238A (en) * | 2024-01-31 | 2024-03-08 | 啸驰电气股份有限公司 | Energy storage frequency converter |
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