CN116231834B - Conversion control method of power supply parallel conversion device and power supply parallel conversion device - Google Patents
Conversion control method of power supply parallel conversion device and power supply parallel conversion deviceInfo
- Publication number
- CN116231834B CN116231834B CN202310293325.2A CN202310293325A CN116231834B CN 116231834 B CN116231834 B CN 116231834B CN 202310293325 A CN202310293325 A CN 202310293325A CN 116231834 B CN116231834 B CN 116231834B
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- power supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; 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—ELECTRIC POWER NETWORKS; 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Ac-Ac Conversion (AREA)
Abstract
本发明公开了一种电源并联转换装置的转换控制方法。本发明通过监测执行开关的实际驱动电压，并根据与合闸动作时间与驱动电压的关系数据来获得更准确的执行开关合闸动作时间，从而避免在电源并联时出现大的环流；本发明还进一步根据实际驱动电压与实际合闸动作时间的历史数据对合闸动作时间与驱动电压的关系数据进行实时修正，从而可确保执行开关在电气寿命范围内均能在期望的合闸相位角合闸，避免出现过大的环流，保证电源系统的正常工作。
The present invention discloses a conversion control method for a parallel power conversion device. This method monitors the actual drive voltage of an actuator switch and, based on the relationship data between the closing action time and the drive voltage, obtains a more accurate closing action time for the actuator switch, thereby avoiding large circulating currents when power supplies are connected in parallel. The present invention further corrects the relationship data between the closing action time and the drive voltage in real time based on historical data of the actual drive voltage and the actual closing action time, thereby ensuring that the actuator switch closes at the desired closing phase angle within its electrical lifespan, avoiding excessive circulating currents and ensuring the normal operation of the power supply system.
Description
Technical Field
The present invention relates to power converters, and more particularly, to a parallel power converter.
Background
The automatic power supply change-over switch is widely applied to an industrial power supply system, when a common power supply fails, the common execution switch is firstly cut off, then the standby execution switch is switched on to supply power to a load, when the common power supply recovers, the standby execution switch is firstly cut off, then the common execution switch is switched on to supply power to the load, and the short-time power failure condition of the load can be caused by the operation of firstly cutting off and then switching on. For industries with higher requirements on power supply continuity, such as petrochemical industry, telecommunication, hospitals and the like, once power failure causes great loss, an automatic transfer switch is required to execute switching-on and switching-off operation in the occasions, if a common power supply is recovered to be normal, a common execution switch is firstly switched on and then a standby execution switch is switched off, the parallel power supply switching operation mode requires that the phase sequence, the voltage difference, the frequency difference and the phase difference of two paths of power supplies are firstly detected when the switching-on operation is executed, and the power supply switching-on operation mode can be switched on when conditions are met, so that the situation that the execution switch is tripped due to the fact that larger loop closing current occurs is avoided, but the action time of the execution switch under different driving voltages is different due to the fact that the action time of the execution switch is different, or the action time of the execution switch is different from the action time of the later in the service life of the execution switch to the new switch, and possible detection conditions are not met when the execution switch action is completed, and circulation power supply cannot be continuously performed for loads due to the fact that the two paths of power supplies are larger.
In order to solve the above problems, some existing parallel power conversion devices consider the closing action time of the execution switch, however, the closing action time of the execution switch adopted by the existing parallel power conversion devices is a fixed value obtained after statistical analysis, the closing action time difference between the execution switches and the influence of the actual driving voltage on the closing action time of the execution switch are not considered, and the change of the closing action time of the execution switch after a certain electrical life is not considered, which affects the expected closing phase angle of the execution switch, thereby affecting the amplitude of the closing loop current, and possibly tripping the execution switch.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art, and provides a conversion control method of a power supply parallel conversion device, which can more effectively avoid the condition that a load is powered off due to the fact that a executive switch is tripped because of larger circulation between two paths of power supplies.
The technical scheme adopted by the invention specifically solves the technical problems as follows:
A conversion control method of a power supply parallel conversion device comprises a group of execution switches respectively connected with two or more power supplies, wherein the specific steps of the conversion control method are as follows, step 1, whether the power supplies to be converted and a target power supply meet the same phase sequence and have the same voltage difference and frequency difference within a preset range is confirmed, if not, the conversion fails, if so, the step 2 is changed;
Step 2, taking the voltage zero crossing point of one of the two power supplies as the timing starting moment of the current wheel, calculating the time length t4 from the timing starting moment of the current wheel to the moment of sending the parallel switching-on instruction according to the phase difference delta phi between the two power supplies at the timing starting moment, wherein the calculation formula is t4=t3-t 2, wherein t3 is the time length from the timing starting moment of the current wheel to the moment of the last phase of the two power supplies in the future, Δf is the frequency difference between the two power supplies, t2 is the current driving voltage of the executing switch corresponding to the target power supply, and the closing action time required by the executing switch from the receiving of the closing instruction to the completion of closing is obtained through the corresponding relation data of the closing action time and the driving voltage of the executing switch;
step 3, judging whether the calculated time t4 is smaller than the voltage period of the two paths of power supplies, if not, switching to step 2 after the two paths of power supply voltages synchronously cross zero, and starting a new round of calculation, if so, then judging whether the phase difference delta phi is smaller than a preset phase difference threshold value, and if so, switching to step 4, otherwise, failing to switch in parallel;
and 4, sending a closing instruction to an execution switch corresponding to the target power supply at a time t4 after the starting time of the round of timing, and sending a switching-off instruction to the execution switch corresponding to the power supply to be converted after the time t6 passes, and ending the parallel conversion, wherein t1 is a preset duration time of a parallel state, and t5 is switching-off action time of the execution switch corresponding to the power supply to be converted.
Further, the conversion control method of the power supply parallel conversion device further comprises the steps of monitoring the actual closing action time and the actual driving voltage of each closing of each executing switch in real time, recording normal closing action data of the actual closing action time and the actual driving voltage in a preset range, and correcting the corresponding relation data of the closing action time and the driving voltage of each executing switch according to the recorded normal closing action data, wherein the corresponding relation data of the closing action time and the driving voltage of each executing switch is corrected according to the following method that the recorded normal closing action times reach the preset times J, after each normal closing, the closing action time corresponding to the actual driving voltage of the current normal closing action is found out from the corresponding relation data of the current closing action time and the driving voltage, and the actual closing action time average value of the latest M normal closing actions is used for updating the actual closing action time.
Preferably, an optimal power supply is selected in real time from the two or more power supplies according to the power supply voltage to supply power to each execution switch.
The following technical scheme can be obtained based on the same inventive concept:
the power supply parallel conversion device comprises a group of execution switches respectively connected with two or more power supplies, and further comprises a control unit for conversion control according to the following method:
step 1, confirming whether the phase sequence between the power supply to be converted and the target power supply is the same, and the voltage difference and the frequency difference are both in a preset range, if not, the conversion fails, and if so, the step 2 is switched;
Step 2, taking the voltage zero crossing point of one of the two power supplies as the timing starting moment of the current wheel, calculating the time length t4 from the timing starting moment of the current wheel to the moment of sending the parallel switching-on instruction according to the phase difference delta phi between the two power supplies at the timing starting moment, wherein the calculation formula is t4=t3-t 2, wherein t3 is the time length from the timing starting moment of the current wheel to the moment of the last phase of the two power supplies in the future, Δf is the frequency difference between the two power supplies, t2 is the current driving voltage of the executing switch corresponding to the target power supply, and the closing action time required by the executing switch from the receiving of the closing instruction to the completion of closing is obtained through the corresponding relation data of the closing action time and the driving voltage of the executing switch;
step 3, judging whether the calculated time t4 is smaller than the voltage period of the two paths of power supplies, if not, switching to step 2 after the two paths of power supply voltages synchronously cross zero, and starting a new round of calculation, if so, then judging whether the phase difference delta phi is smaller than a preset phase difference threshold value, and if so, switching to step 4, otherwise, failing to switch in parallel;
and 4, sending a closing instruction to an execution switch corresponding to the target power supply at a time t4 after the starting time of the round of timing, and sending a switching-off instruction to the execution switch corresponding to the power supply to be converted after the time t6 passes, and ending the parallel conversion, wherein t1 is a preset duration time of a parallel state, and t5 is switching-off action time of the execution switch corresponding to the power supply to be converted.
The control unit further comprises a data correction module, wherein the data correction module is used for monitoring the actual closing action time and the actual driving voltage of each closing of each executing switch in real time, recording normal closing action data of the actual closing action time and the actual driving voltage in a preset range, correcting the corresponding relation data of the closing action time and the driving voltage of each executing switch according to the recorded normal closing action data, namely, after each normal closing, the corresponding closing action time of the current corresponding relation data of the closing action time and the driving voltage is found out, and the corresponding closing action time is updated by the average value of the actual closing action time of the latest M times of normal closing actions, wherein M is more than 0 and less than or equal to J.
Preferably, the power supply parallel conversion device further comprises a power supply selection circuit, which is used for selecting an optimal power supply from the two or more power supplies according to the power supply voltage in real time to supply power to each execution switch.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects that;
The invention monitors the actual driving voltage of the executive switch, obtains more accurate executive switch closing action time according to the relation data between the executive switch closing action time and the driving voltage, thereby avoiding large circulation when the power supplies are connected in parallel, and further corrects the relation data between the executive switch closing action time and the driving voltage in real time according to the history data of the actual driving voltage and the actual closing action time, thereby ensuring that the executive switch can close at a desired closing phase angle within the electric life range, avoiding overlarge circulation and ensuring the normal work of a power supply system.
Drawings
FIG. 1 is a block diagram of a power supply parallel conversion apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of determining a closing command sending time.
Detailed Description
Aiming at the defects of the prior art, the method and the device solve the problem that the relation between the switching-on action time of the executing switch and the driving voltage is considered in the parallel power supply conversion control process, the actual driving voltage of the executing switch is monitored, and the more accurate switching-on action time of the executing switch is obtained according to the relation data between the switching-on action time and the driving voltage, so that large circulation current is avoided when the power supplies are connected in parallel.
The technical scheme provided by the invention is as follows:
A conversion control method of a power supply parallel conversion device comprises a group of execution switches respectively connected with two or more power supplies, wherein the specific steps of the conversion control method are as follows, step 1, whether the power supplies to be converted and a target power supply meet the same phase sequence and have the same voltage difference and frequency difference within a preset range is confirmed, if not, the conversion fails, if so, the step 2 is changed;
Step 2, taking the voltage zero crossing point of one of the two power supplies as the timing starting moment of the current wheel, calculating the time length t4 from the timing starting moment of the current wheel to the moment of sending the parallel switching-on instruction according to the phase difference delta phi between the two power supplies at the timing starting moment, wherein the calculation formula is t4=t3-t 2, wherein t3 is the time length from the timing starting moment of the current wheel to the moment of the last phase of the two power supplies in the future, Δf is the frequency difference between the two power supplies, t2 is the current driving voltage of the executing switch corresponding to the target power supply, and the closing action time required by the executing switch from the receiving of the closing instruction to the completion of closing is obtained through the corresponding relation data of the closing action time and the driving voltage of the executing switch;
step 3, judging whether the calculated time t4 is smaller than the voltage period of the two paths of power supplies, if not, switching to step 2 after the two paths of power supply voltages synchronously cross zero, and starting a new round of calculation, if so, then judging whether the phase difference delta phi is smaller than a preset phase difference threshold value, and if so, switching to step 4, otherwise, failing to switch in parallel;
and 4, sending a closing instruction to an execution switch corresponding to the target power supply at a time t4 after the starting time of the round of timing, and sending a switching-off instruction to the execution switch corresponding to the power supply to be converted after the time t6 passes, and ending the parallel conversion, wherein t1 is a preset duration time of a parallel state, and t5 is switching-off action time of the execution switch corresponding to the power supply to be converted.
The power supply parallel conversion device comprises a group of execution switches respectively connected with two or more power supplies, and further comprises a control unit for conversion control according to the following method:
step 1, confirming whether the phase sequence between the power supply to be converted and the target power supply is the same, and the voltage difference and the frequency difference are both in a preset range, if not, the conversion fails, and if so, the step 2 is switched;
Step 2, taking the voltage zero crossing point of one of the two power supplies as the timing starting moment of the current wheel, calculating the time length t4 from the timing starting moment of the current wheel to the moment of sending the parallel switching-on instruction according to the phase difference delta phi between the two power supplies at the timing starting moment, wherein the calculation formula is t4=t3-t 2, wherein t3 is the time length from the timing starting moment of the current wheel to the moment of the last phase of the two power supplies in the future, Δf is the frequency difference between the two power supplies, t2 is the current driving voltage of the executing switch corresponding to the target power supply, and the closing action time required by the executing switch from the receiving of the closing instruction to the completion of closing is obtained through the corresponding relation data of the closing action time and the driving voltage of the executing switch;
step 3, judging whether the calculated time t4 is smaller than the voltage period of the two paths of power supplies, if not, switching to step 2 after the two paths of power supply voltages synchronously cross zero, and starting a new round of calculation, if so, then judging whether the phase difference delta phi is smaller than a preset phase difference threshold value, and if so, switching to step 4, otherwise, failing to switch in parallel;
and 4, sending a closing instruction to an execution switch corresponding to the target power supply at a time t4 after the starting time of the round of timing, and sending a switching-off instruction to the execution switch corresponding to the power supply to be converted after the time t6 passes, and ending the parallel conversion, wherein t1 is a preset duration time of a parallel state, and t5 is switching-off action time of the execution switch corresponding to the power supply to be converted.
In order to further improve the accuracy of the estimation of the closing action time of the execution switch, the invention further corrects the relation data of the closing action time and the driving voltage in real time according to the history data of the actual driving voltage and the actual closing action time, thereby ensuring that the execution switch can be closed at a desired closing phase angle within the electric life range, avoiding the occurrence of excessive circulation, and specifically:
The control unit further comprises a data correction module, wherein the data correction module is used for monitoring the actual closing action time and the actual driving voltage of each closing of each executing switch in real time, recording normal closing action data of the actual closing action time and the actual driving voltage in a preset range, correcting the corresponding relation data of the closing action time and the driving voltage of each executing switch according to the recorded normal closing action data, namely, after each normal closing, finding out the closing action time corresponding to the actual driving voltage of the current normal closing action from the corresponding relation data of the current closing action time and the driving voltage, and updating the closing action time by using the average value of the actual closing action time of the latest M times of normal closing actions, wherein M is less than or equal to J.
In order to ensure the stability of the driving voltage of the executing switch as far as possible, the power supply parallel conversion device further comprises a power supply selection circuit, which is used for selecting an optimal power supply from the two or more power supplies according to the power supply voltage in real time to supply power to each executing switch.
For the convenience of public understanding, the following describes the technical scheme of the invention by taking the simplest dual-power mutual projection system as an example and combining with the accompanying drawings:
As shown in fig. 1, the power conversion system of the present embodiment includes a first power source, a second power source, and a parallel power conversion device. The parallel power conversion device comprises a first power input end, a second power input end, a first output end, a second output end, a first executive switch, a second executive switch and a control unit, wherein the first power input end and the second power input end are respectively connected with a first power source and a second power source, the first executive switch is connected between the first power input end and the first output end in series, the second executive switch is connected between the second power input end and the second output end in series, the first output end and the second output end are connected together and then connected to the load, the control unit can respectively control the first executive switch and the second executive switch, the control unit comprises a microprocessor, a power circuit, a voltage detection circuit, a frequency detection circuit, a power selection circuit, a switch state detection circuit, an executive switch on/off control circuit and a phase detection circuit, the voltage detection circuit, the frequency detection circuit and the phase detection circuit are respectively used for detecting the input voltage, the input frequency and the input phase of the first power input end and the second power input end, the switch state detection circuit is used for detecting the input state of the first executive switch and the second executive switch in real time, the switch state detection circuit is connected with the second executive switch, the control circuit is connected with the first executive switch and the second executive switch in parallel, the power source is connected with the first power source and the second executive switch in parallel, the control circuit is connected with the first power input end and the control circuit is connected with the first power switch in parallel, the control state control circuit is in parallel, the phase-on the control state is different from the first switch and the input state switch is connected with the first switch and the second switch, and the control circuit is connected with the control switch is connected with the input command input to the control switch, and sending a parallel switching-on instruction to an execution switch corresponding to the target power supply at the time of sending the parallel switching-on instruction. In addition, the power supply circuit in this embodiment obtains electric energy from the first power supply and/or the second power supply and converts the electric energy into a suitable voltage for the control unit to use. The power supply selection circuit in this embodiment is configured to select, in real time, an optimal power supply from the two power supplies according to a power supply voltage, to supply power to each execution switch.
The voltage detection circuit, the frequency detection circuit, the switch state detection circuit, the switch on/off execution control circuit and the phase detection circuit in the device are all mature technologies in the field, and a specific circuit structure can be selected by a person skilled in the art according to actual conditions. The frequency detection circuit in the embodiment converts the voltage signals of the first power supply and the second power supply into zero-crossing pulse signals and transmits the zero-crossing pulse signals to the microprocessor, and the microprocessor acquires the frequencies of the first power supply and the second power supply according to the zero-crossing pulse signal intervals.
The control unit performs power supply parallel conversion control according to the following steps:
step 1, confirming whether the phase sequence between the power supply to be converted and the target power supply is the same, and the voltage difference and the frequency difference are both in a preset range, if not, the conversion fails, and if so, the step 2 is switched;
Step 2, taking the voltage zero crossing point of one of the two power supplies as the timing starting moment of the current wheel, calculating the time length t4 from the timing starting moment of the current wheel to the moment of sending the parallel switching-on instruction according to the phase difference delta phi between the two power supplies at the timing starting moment, wherein the calculation formula is t4=t3-t 2, wherein t3 is the time length from the timing starting moment of the current wheel to the moment of the last phase of the two power supplies in the future, Δf is the frequency difference between the two power supplies, t2 is the current driving voltage of the executing switch corresponding to the target power supply, and the closing action time required by the executing switch from the receiving of the closing instruction to the completion of closing is obtained through the corresponding relation data of the closing action time and the driving voltage of the executing switch;
step 3, judging whether the calculated time t4 is smaller than the voltage period of the two paths of power supplies, if not, switching to step 2 after the two paths of power supply voltages synchronously cross zero, and starting a new round of calculation, if so, then judging whether the phase difference delta phi is smaller than a preset phase difference threshold value, and if so, switching to step 4, otherwise, failing to switch in parallel;
Step 4, a closing instruction is sent to an execution switch corresponding to the target power supply at a time t4 after the starting time of the round of timing, and a switching-off instruction is sent to the execution switch corresponding to the power supply to be converted after a time t6 passes, and the parallel conversion is finished, wherein t1 is a preset duration time of a parallel state, and t5 is switching-off action time of the execution switch corresponding to the power supply to be converted;
As shown in fig. 2, taking phase B as an example, when the phase difference between the first power source and the second power source detected by the control unit in real time is Φ1, the time from the moment when the first power source and the second power source are in phase is t3, (Δf>0);The closing action time t2 of the executing switch is obtained from the corresponding relation data of the closing action time-driving voltage of the executing switch according to the current actual driving voltage value, the parallel connection time t1 can be preset by the control unit, so that the control unit can start timing from the zero crossing point moment (namely the moment A) of the second power supply, namely the moment A, the calculated phase difference is phi 0, when the timing time reaches t3-t2 (namely the moment B), in order to ensure that the combined ring current is smaller, the control unit can compare the phase difference phi 1 detected in real time with the set phase difference threshold value phi s, only when phi 1 is less than phi s, the control unit sends out an executing switch parallel connection command, the parallel connection conversion device realizes parallel connection at the moment C, the phase B of the first power supply and the second power supply is the same, the ring closing current is 0 at the moment B, and the parallel connection is finished at the moment D. In the parallel process, a command of breaking an execution switch is sent by taking the moment B as a starting point and passing through t1+t2-t 5. In order to further reduce the closed-loop current value, the parallel time t1 is reduced, but t1 must be longer than the time for executing the switching-off operation of the switch, and the smaller the parallel time t1, the smaller the phase difference between the first power supply and the second power supply is, and the smaller the closed-loop current value is.
Step 5, correcting the corresponding relation data of the switching-on action time and the driving voltage of each executive switch according to the recorded normal switching-on action data:
The control unit monitors the actual closing action time and the actual driving voltage of each closing of each executing switch in real time, records the normal closing action data of the actual closing action time and the actual driving voltage within a preset range, and corrects the corresponding relation data of the closing action time and the driving voltage of each executing switch according to the recorded normal closing action data, wherein the corresponding relation data of the closing action time and the driving voltage of each executing switch is corrected according to the following method that the corresponding relation data of the current closing action time and the driving voltage find the closing action time corresponding to the actual driving voltage of the current normal closing action after each normal closing, and the corresponding relation data of the actual closing action time of the current normal closing action is updated by the actual closing action time average value of the latest M normal closing actions, and M is more than 0 and less than or equal to J.
The corresponding relation data of the closing action time and the driving voltage of the executing switch can be in the form of an array or a relation curve, and the simplest array is taken as an example to further describe a specific correction method:
(1) An array t (i), i= 0~n of the relation between the driving voltage and the closing action time of the execution switch is arranged in the microprocessor, wherein array elements are the closing action time of the execution switch under different driving voltages, U z1 is the upper limit of the driving voltage, U z2 is the lower limit of the driving voltage, deltau is the voltage interval, and the relation between the driving voltage and the time t (i) for executing the switch closing action is that the driving voltage in the range of Uz1+ (m-1) DeltaU to Uz1+mDeltaU corresponds to the time t (m) for executing the switch closing action, m E [0, n ].
(2) The control unit monitors the closing action time t of the execution switch whenExecuting the step (3) when t epsilon (ttz 1, ttz 2), wherein ttz is the lower limit of the time for executing the switch-on and switch-off actions, and ttz2 is the upper limit of the time for executing the switch-on and switch-off actions;
(3) When the number of switching-on times of the driving voltage of the executing switch in the range of Uz1+ (M-1) DeltaU-Uz1+mDeltaU is less than or equal to J times, the time array t (i) of the switching-on operation of the executing switch is unchanged (t (i) is designed with a default value), and (4) when the number of switching-on times of the driving voltage of the executing switch in the range of Uz1+ (M-1) DeltaU-Uz1+mDeltaU is more than J times, the controller records the driving voltage of the moment of the executing switch and stores the driving voltage in the voltage array U (M), records the time t (M) of the executing switch switching-on operation at the moment, calculates the time average value of the executing switch switching-on operation, and updates the corresponding time array element of the executing switch-on operation at the driving voltage,
If the M driving voltages U (M) are all within the range of Uz1+ (M-1) DeltaU to Uz1+mDeltaU, calculating and executing a time average value of the switch closing actionsUpdating an array t (m) of the relation between the driving voltage and the time of executing the switch closing action by using an executing switch closing action time average value t m;
(5) And (3) repeating the step (3) along with the increase of the number of times of executing the switching-on action, re-acquiring the new driving voltage at the moment of executing the switching-on action for M times, storing the new driving voltage in a voltage array U (M), recording the time t (M) of executing the switching-on action at the moment, calculating the average value of the time of executing the switching-on action, updating the corresponding time array element of executing the switching-on action under the driving voltage, and repeatedly updating the time array t (i) of executing the switching-on action.
When the parallel conversion device is a conversion device such as a two-wire one-bus conversion device, a three-wire one-wire conversion device, a three-wire two-bus conversion device, a two-wire one-bus two-power conversion device, and the like, the parallel conversion principle is the same, and only the number of input power supply paths, the number of voltage detection circuits, the number of switching control circuits and the number of switching state detection circuits are different, and are not described herein.
Claims (6)
1. A conversion control method of a power supply parallel conversion device comprises a group of execution switches respectively connected with two or more power supplies, and is characterized by comprising the following specific steps of:
step 1, confirming whether the phase sequence between the power supply to be converted and the target power supply is the same, and the voltage difference and the frequency difference are both in a preset range, if not, the conversion fails, and if so, the step 2 is switched;
Step 2, taking the voltage zero crossing point of one of the two power supplies as the timing starting moment of the current wheel, calculating the time length t4 from the timing starting moment of the current wheel to the moment of sending the parallel switching-on instruction according to the phase difference delta phi between the two power supplies at the timing starting moment, wherein the calculation formula is t4=t3-t 2, wherein t3 is the time length from the timing starting moment of the current wheel to the moment of the last phase of the two power supplies in the future, Δf is the frequency difference between the two power supplies, t2 is the current driving voltage of the executing switch corresponding to the target power supply, and the closing action time required by the executing switch from the receiving of the closing instruction to the completion of closing is obtained through the corresponding relation data of the closing action time and the driving voltage of the executing switch;
step 3, judging whether the calculated time t4 is smaller than the voltage period of the two paths of power supplies, if not, switching to step 2 after the two paths of power supply voltages synchronously cross zero, and starting a new round of calculation, if so, then judging whether the phase difference delta phi is smaller than a preset phase difference threshold value, and if so, switching to step 4, otherwise, failing to switch in parallel;
Step 4, a closing instruction is sent to an execution switch corresponding to the target power supply at a time t4 after the starting time of the round of timing, a switching-off instruction is sent to the execution switch corresponding to the power supply to be converted after the time t6 passes, and the parallel conversion is finished;
t6=t1+t2-t 5, where t1 is a preset duration of parallel state, and t5 is a switching-off action time of the executing switch corresponding to the power to be converted.
2. The method for converting and controlling the power supply parallel conversion device according to claim 1, further comprising the steps of monitoring the actual closing action time and the actual driving voltage of each closing of each executing switch in real time, recording normal closing action data of the actual closing action time and the actual driving voltage within a preset range, and correcting the corresponding relation data of the closing action time and the driving voltage of each executing switch according to the recorded normal closing action data, wherein the corresponding relation data of the closing action time and the driving voltage of each executing switch is corrected according to the following method that the recorded normal closing action times reach a preset times J, after each normal closing, the closing action time corresponding to the actual driving voltage of the current normal closing action is found out from the corresponding relation data of the current closing action time and the driving voltage, and the corresponding relation data is updated by the average value of the actual closing action times of the latest M normal closing actions, and M is less than or equal to J.
3. The conversion control method of the power supply parallel conversion device according to claim 1 or 2, wherein an optimal one of the two or more power supplies is selected in real time according to a power supply voltage to supply power to each of the execution switches.
4. The power supply parallel conversion device comprises a group of execution switches respectively connected with two or more power supplies, and is characterized by further comprising a control unit for conversion control according to the following method:
step 1, confirming whether the phase sequence between the power supply to be converted and the target power supply is the same, and the voltage difference and the frequency difference are both in a preset range, if not, the conversion fails, and if so, the step 2 is switched;
Step 2, taking the voltage zero crossing point of one of the two power supplies as the timing starting moment of the current wheel, calculating the time length t4 from the timing starting moment of the current wheel to the moment of sending the parallel switching-on instruction according to the phase difference delta phi between the two power supplies at the timing starting moment, wherein the calculation formula is t4=t3-t 2, wherein t3 is the time length from the timing starting moment of the current wheel to the moment of the last phase of the two power supplies in the future, Δf is the frequency difference between the two power supplies, t2 is the current driving voltage of the executing switch corresponding to the target power supply, and the closing action time required by the executing switch from the receiving of the closing instruction to the completion of closing is obtained through the corresponding relation data of the closing action time and the driving voltage of the executing switch;
step 3, judging whether the calculated time t4 is smaller than the voltage period of the two paths of power supplies, if not, switching to step 2 after the two paths of power supply voltages synchronously cross zero, and starting a new round of calculation, if so, then judging whether the phase difference delta phi is smaller than a preset phase difference threshold value, and if so, switching to step 4, otherwise, failing to switch in parallel;
Step 4, a closing instruction is sent to an execution switch corresponding to the target power supply at a time t4 after the starting time of the round of timing, a switching-off instruction is sent to the execution switch corresponding to the power supply to be converted after the time t6 passes, and the parallel conversion is finished;
t6=t1+t2-t 5, where t1 is a preset duration of parallel state, and t5 is a switching-off action time of the executing switch corresponding to the power to be converted.
5. The power supply parallel conversion device according to claim 4, wherein the control unit further comprises a data correction module for monitoring the actual closing action time and the actual driving voltage of each closing of each executing switch in real time and recording normal closing action data of the actual closing action time and the actual driving voltage within a preset range, and correcting the closing action time-driving voltage correspondence data of each executing switch according to the recorded normal closing action data, wherein after each normal closing, the closing action time corresponding to the actual driving voltage of the current normal closing action is found out from the current closing action time-driving voltage correspondence data, and the actual closing action time average value of the latest M normal closing actions is updated, and M is equal to or less than J.
6. The power parallel conversion apparatus according to claim 4 or 5, further comprising a power supply selection circuit for selecting an optimal one of the two or more power supplies in real time according to a power supply voltage to supply power to each of the execution switches.
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| CN104682551A (en) * | 2015-03-18 | 2015-06-03 | 常熟开关制造有限公司(原常熟开关厂） | Closed-loop screening method for power parallel conversion device and power parallel conversion device |
| CN104701973A (en) * | 2015-04-08 | 2015-06-10 | 常熟开关制造有限公司(原常熟开关厂） | Control method for parallel power supply conversion device and parallel power supply conversion device |
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| CN108023406B (en) * | 2017-12-25 | 2019-12-06 | 常熟开关制造有限公司(原常熟开关厂） | quick switching control method of automatic change-over switch and automatic change-over switch |
| CN114720864B (en) * | 2022-03-23 | 2024-08-09 | 国网安徽省电力有限公司滁州供电公司 | Tripping and closing loop diagnosis method based on fault wave recording file |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104682551A (en) * | 2015-03-18 | 2015-06-03 | 常熟开关制造有限公司(原常熟开关厂） | Closed-loop screening method for power parallel conversion device and power parallel conversion device |
| CN104701973A (en) * | 2015-04-08 | 2015-06-10 | 常熟开关制造有限公司(原常熟开关厂） | Control method for parallel power supply conversion device and parallel power supply conversion device |
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