CN116885934A - Power control method for multi-inverter parallel system and main inverter thereof - Google Patents
Power control method for multi-inverter parallel system and main inverter thereof Download PDFInfo
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- CN116885934A CN116885934A CN202310871322.2A CN202310871322A CN116885934A CN 116885934 A CN116885934 A CN 116885934A CN 202310871322 A CN202310871322 A CN 202310871322A CN 116885934 A CN116885934 A CN 116885934A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
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Abstract
The application provides a power control method of a multi-inverter parallel system and a main inverter thereof, when judging that the main inverter has faults, determining a plurality of target slave inverters which have not faults from the slave inverters according to the equipment state of each slave inverter; wherein, each slave inverter and the master inverter belong to the same multi-inverter parallel system; determining slave inverters to be switched which meet a host switching rule from the target slave inverters according to the de-rated power information of each target slave inverter; the de-rated power information of the target slave inverter comprises de-rated running power of the target slave inverter after de-rating operation; and switching the slave inverter to be switched into the master inverter, and controlling the switched master inverter to send synchronous clock signal reference current signals to each target slave inverter.
Description
Technical Field
The application relates to the technical field of new energy, in particular to a power control method of a multi-inverter parallel system and a main inverter thereof.
Background
Along with the continuous development and utilization of renewable energy sources, new energy power stations which are increasingly composed of distributed energy sources such as solar energy, wind energy, battery energy storage systems and the like gradually form a certain scale. In the new energy power station, the safe, stable and reliable operation of the new energy power station is generally ensured through parallel control of a plurality of inverters.
At present, a parallel control mode of a plurality of inverters is mainly a master-slave control mode, and particularly a multi-inverter parallel system is formed by a master inverter and a plurality of slave inverters; the master inverter has a common control unit function and is used for sending a synchronous clock and a reference current signal to each slave inverter; however, once the master inverter fails to shut down, the slave inverter loses the synchronous clock and reference current signals, forcing the slave inverter to shut down forcibly, resulting in complete paralysis of the multiple inverter parallel system.
Therefore, there is a need for a power control method of a parallel system of multiple inverters, which ensures the normal operation of the slave inverter when the master inverter fails and stops, so as to avoid paralysis of the parallel system of multiple inverters.
Disclosure of Invention
In view of this, the embodiment of the application provides a power control method for a multi-inverter parallel system and a main inverter thereof, so as to ensure normal operation of a slave inverter and avoid paralysis of the multi-inverter parallel system when the main inverter fails and stops.
The first aspect of the application provides a power control method of a multi-inverter parallel system, which is applied to a main inverter, and comprises the following steps:
When it is determined that the master inverter fails, determining a plurality of target slave inverters from among the respective slave inverters that do not fail according to the device state of each slave inverter; wherein each slave inverter and the master inverter belong to the same multi-inverter parallel system;
determining a slave inverter to be switched which meets a master switching rule from the target slave inverters according to the derated power information of each target slave inverter; the de-rated power information of the target slave inverter comprises de-rated running power of the target slave inverter after de-rated operation;
and switching the slave inverter to be switched into a master inverter, and controlling the master inverter after switching to send synchronous clock signal reference current signals to the target slave inverters.
Optionally, determining, from the target slave inverters, the slave inverter to be switched that satisfies the master switching rule according to the derated power information of each target slave inverter, including:
controlling each target slave inverter to perform derating operation;
sequencing each target slave inverter from large to small according to the de-rated running power of each target slave inverter after de-rating operation to obtain an inverter sequence;
Calculating a system derating desire based on the derated operating power of the first target slave inverter and the derated operating power of the second target slave inverter; the first target slave inverter and the second target slave inverter are two target slave inverters which are arranged at the tail in the inverter sequence, and the de-rated operation power of the first target slave inverter is larger than that of the second target slave inverter;
if the system derating expectations meet a preset derating threshold, determining the slave inverter to be switched by the first target slave inverter, and closing the slave inverter of the second target;
and if the system reduces the expectation that the preset derating threshold is not met, determining the slave inverter to be switched from the second target slave inverter.
Optionally, calculating the derating expectations of the system based on the derated operating power of the first target slave inverter and the derated operating power of the second target slave inverter includes:
calculating a product of the derated operating power of the first target slave inverter and the first coefficient, and a product of the derated operating power of the second target slave inverter and the second coefficient; wherein the first coefficient is smaller than the second coefficient;
and calculating a difference value of a product of the derated running power of the first target slave inverter and the first coefficient and a product of the derated running power of the second target slave inverter and the second coefficient to obtain the system derated power.
Optionally, the process of determining whether the main inverter fails includes:
acquiring the equipment state of the main inverter, and judging whether the equipment state of the main inverter is any one of a plurality of preset fault states;
if the equipment state of the main inverter is any one of the preset fault states, judging that the main inverter has faults;
and if the equipment state of the main inverter is not any one of the preset fault states, judging that the main inverter is not faulty.
Optionally, when it is determined that the master inverter fails, determining at least one target slave inverter that does not fail from the respective slave inverters according to the device state of each slave inverter includes:
for each of the slave inverters, when the master inverter is judged to be faulty, judging whether the equipment state of the slave inverter is any one of a plurality of preset fault states;
if the equipment state of the slave inverter is any one of the preset fault states, judging that the slave inverter has faults;
And if the equipment state of the slave inverter is not any preset fault state in the plurality of preset fault states, judging that the slave inverter does not have faults, and determining the non-faulty inverter as a target slave inverter.
Optionally, the method further comprises:
and when the slave inverter is judged to be faulty, the slave inverter is closed.
Optionally, the method further comprises:
when the main inverter is judged to have no faults, determining a system fault expected value, a system fault quantity value and a system power expected value according to the equipment states and the power information of the inverters; wherein each of the inverters includes each of the slave inverter and the master inverter;
calculating a shutdown expectation of the multi-inverter parallel system according to the expected system fault value, the expected system fault quantity value and the expected system power value;
accordingly, when it is determined that the master inverter fails, determining at least one target slave inverter that does not fail from among the respective slave inverters according to the device state of each of the slave inverters, includes:
when it is determined that the master inverter has failed, or when it is determined that the master inverter has not failed and the shutdown expectation is within a preset expectation range, at least one target slave inverter that has not failed is determined from the respective slave inverters according to the device state of each of the slave inverters.
Optionally, calculating a shutdown expectation of the multi-inverter parallel system according to the expected value of the system fault, the value of the system fault quantity and the expected value of the system power comprises:
and determining shutdown expectations of the multi-inverter parallel system according to the weights of the expected values of the system faults and the corresponding weights of the expected values of the system faults, the weights of the number of the system faults and the corresponding weights of the expected values of the system power.
Optionally, the method further comprises:
and if the shutdown expectation is larger than any preset expected value in the preset expected range, controlling the multi-inverter parallel system to shutdown.
Optionally, before the master inverter after the switching is controlled to send the synchronous clock signal reference current signal to each target slave inverter, the method further includes:
determining a target system fault expected value, a target system fault quantity value and a target system power expected value according to the equipment state and derated power information of each target inverter; wherein each of the target inverters includes the slave inverter to be switched that is switched to a master inverter and each of the target slave inverters;
calculating a target shutdown expectation of the multi-inverter parallel system according to the target system fault expected value, the target system fault quantity value and the target system power expected value;
If the target shutdown expectation is larger than any preset expected value in a preset expected range, controlling the multi-inverter parallel system to shutdown after switching the main inverter;
correspondingly, before the master inverter after the control switch sends the synchronous clock signal reference current signals to each target slave inverter, the method comprises the following steps:
and if the target shutdown expectation is within the preset expectation range, controlling the switched master inverter to send synchronous clock signal reference current signals to each target slave inverter.
Optionally, the method further comprises:
and if the target system fault quantity value is larger than a preset fault threshold value, controlling the multi-inverter parallel system to stop after the main inverter is switched.
The second aspect of the application provides a main inverter, which comprises a main-slave controller and a fault linkage rule controller;
the fault linkage rule controller is used for determining at least one target slave inverter which does not have faults from the slave inverters according to the equipment state of each slave inverter when the master inverter is judged to have faults; wherein each slave inverter and the master inverter belong to the same multi-inverter parallel system; determining a slave inverter to be switched which meets a master switching rule from the target slave inverters according to the derated power information of each target slave inverter; the de-rated power information of the target slave inverter comprises de-rated running power of the target slave inverter after de-rated operation;
The master-slave controller is used for switching the master inverter into the slave inverter to be switched and controlling the master inverter after switching to send synchronous clock signal reference current signals to each target slave inverter.
The application provides a power control method and a system for a multi-inverter parallel system, which are applied to a master inverter, and when the master inverter is judged to have faults, at least one target slave inverter which does not have faults is determined from all the slave inverters according to the equipment state of each slave inverter; wherein each slave inverter and the master inverter belong to the same multi-inverter parallel system; determining a slave inverter to be switched which meets a master switching rule from the target slave inverters according to the derated power information of each target slave inverter; the de-rated power information of the target slave inverter comprises the operating power of the target slave inverter after de-rated operation; and switching the master inverter into the slave inverter to be switched, and controlling the master inverter after switching to send synchronous clock signal reference current signals to the target slave inverters. According to the technical scheme provided by the application, under the condition that the main inverter fails, the main inverter can be switched into the to-be-switched auxiliary inverter which does not fail and meets the switching rule of the main machine, so that the synchronous clock signal reference current signals are sent to each target auxiliary inverter by using the switched main inverter, and the normal operation of the auxiliary inverter is ensured under the condition that the main inverter fails and stops, and the paralysis of a multi-inverter parallel system is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of a multi-inverter parallel system according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a power control method of a multi-inverter parallel system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a main inverter according to an embodiment of the present application;
fig. 4 is a block diagram of another multi-inverter parallel system according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As can be seen from the above background art, once the master inverter fails and stops, the slave inverter loses the synchronous clock and the reference current signal, thereby forcing the slave inverter to forcibly shut down, and causing the parallel system of multiple inverters to be completely paralyzed.
In the prior art, the above problems can be solved by adopting a redundant logic control mode, specifically, a redundant voltage outer loop controller in a hot standby state is added to the control logic of each slave inverter, when the master inverter fails, the voltage outer loop controller switches the operation mode of any slave inverter into the operation mode of the master inverter, so that the slave inverter is switched into the master inverter to work instead of the failed master inverter, and the parallel system is prevented from being completely paralyzed. However, in this way, it is impossible to ensure that the operation condition of the slave inverter switched to the master inverter is determined, when there is an abnormality in the operation condition of the slave inverter switched to the master inverter, the multi-inverter parallel system is still caused to break down, and because of the circulation and current sharing control manner adopted by the multi-inverter parallel system, the operation condition of the slave inverter strictly follows the master inverter, if the derating amount of the slave inverter selected as the master inverter is too large, the derating amount of other slave inverters is also affected, so that the charging and discharging power of the whole multi-inverter parallel system is reduced, and the normal operation of the multi-inverter parallel system is affected.
Therefore, the application provides a power control method and a system for a multi-inverter parallel system, which can find out at least one target slave inverter which does not have faults from all slave inverters under the condition that a main inverter has faults, and ensure that the running condition of the slave inverter which is switched into the main inverter is normal; the application can further determine the slave inverter to be switched which meets the switching rule of the host from the slave inverters according to the de-rated operation power of each target slave inverter after de-rated operation, thereby avoiding the de-rated abnormality of the slave inverter which is switched into the master inverter, ensuring the normal operation of other slave inverters and avoiding paralysis of a multi-inverter parallel system under the condition that the master inverter fails and stops.
Referring to fig. 1, a block diagram of a multi-inverter parallel system provided by an embodiment of the present application is shown, where the multi-inverter parallel system includes a master inverter and a plurality of slave inverters.
Referring to fig. 2, a flow chart of a power control method of a multi-inverter parallel system provided by an embodiment of the present application is shown and applied to a main inverter in the multi-inverter parallel system shown in fig. 1, where the main inverter is also called a host inverter, and the method specifically includes the following steps:
S201: judging whether the main inverter has a fault or not; if it is determined that the main inverter fails, step S202 is executed; if it is determined that the main inverter has not failed, step S205 is performed.
In the embodiment of the present application, a plurality of preset fault states may be preset, for example, the plurality of preset fault states may include an island fault state, an overvoltage fault state, an undervoltage fault state, and the like, and the corresponding preset fault states may be set according to actual applications, which is not limited herein.
Alternatively, the process of determining whether the main inverter fails may be: acquiring the equipment state of the main inverter, and judging whether the equipment state of the main inverter is any one of a plurality of preset fault states; if the equipment state of the main inverter is any one of a plurality of preset fault states, judging that the main inverter has faults; if the equipment state of the main inverter is not any one of a plurality of preset fault states, judging that the main inverter does not have faults.
In the case where it is determined that the main inverter has failed, step S202 may be performed; in the case where it is determined that the main inverter has not failed, step S205 may be performed.
S202: a plurality of target slave inverters which have not failed are determined from among the respective slave inverters according to the device state of each slave inverter.
In the process of specifically executing step S202, in the case where it is determined that the master inverter has failed, the device state of each slave inverter may be further acquired so as to determine a plurality of target slave inverters that have not failed from among the respective slave inverters according to the device state of each slave inverter.
Alternatively, for each slave inverter, the process of determining whether the slave inverter has failed may be: for each slave inverter, when it is determined that the master inverter fails, it may be further determined whether the device state of the slave inverter is any one of a plurality of preset failure states; if the equipment state of the slave inverter is any one of a plurality of preset fault states, judging that the slave inverter has faults; if the equipment state of the slave inverter is not any one of a plurality of preset fault states, judging that the slave inverter does not have faults, and determining the non-faulty inverter as a target slave inverter.
Further, in the embodiment of the present application, for each slave inverter, when it is determined that the slave inverter fails, the slave inverter may be turned off, so as to avoid that when the master inverter fails, the failed slave inverter is erroneously switched to the master inverter, which results in paralysis of the multi-inverter parallel system.
In this embodiment, in order to further ensure the normal operation of the multi-inverter parallel system, before determining at least one target slave inverter that is not faulty from among the respective slave inverters according to the device status of each slave inverter, the number of faults of the slave inverters may be determined according to the number of the slave inverters that are determined to be faulty, and whether the number of faults of the slave inverters is greater than a preset threshold may be determined, and if the number of faults of the slave inverters is greater than the preset threshold, the multi-inverter parallel system may be considered to have a greater risk of currently continuing to operate, so that the multi-inverter parallel system may be shut down for maintenance.
It should be noted that the preset threshold is set according to the number of inverters in the multi-inverter parallel system; wherein the number of inverters includes the number of master inverters and slave inverters.
For example, if the multi-inverter parallel system includes 5 inverters, the preset threshold may be set to 2, and if the number of faults of the slave inverters of the multi-inverter parallel system is 3, which indicates that there are 3 inverters currently in fault, the risk of continuous operation of the multi-inverter parallel system is considered to be relatively high, and then the multi-inverter parallel system may be shut down for maintenance, so that restarting operation is performed after the maintenance of the multi-inverter parallel system is completed.
S203: determining slave inverters to be switched which meet a host switching rule from the target slave inverters according to the de-rated power information of each target slave inverter; wherein the derated power information of the target slave inverter includes the operating power of the target slave inverter after the derating operation.
In this embodiment, since the multi-inverter parallel system adopts the mode of current sharing control to avoid loop current control, that is, the operating power of the master inverter and the slave inverter is equal, if the number of the inverters in the multi-inverter parallel system is reduced, the multi-inverter parallel system must take the number of the reduced inverters as the reference, and other inverters are subjected to common derating, otherwise, the multi-inverter parallel system will generate loop current, and if the number of the reduced inverters in the multi-inverter parallel system exceeds a certain number, the overall operation of the multi-inverter parallel system will be affected.
For example, one of the 5 target slave inverters has a derating amount of 40% and the other target slave inverters has a derating amount of 0, taking the operating power of the whole multi-inverter parallel system as an example, the single-machine operating power of each target slave inverter is 50kw, and one target slave inverter is derated to 60% to operate, so that all target slave inverters can perform common derating, and the derating amount is 40%, and the operating power of the whole multi-inverter parallel system is reduced from 205kw to 150kw; if the target is considered to be approximately faulty from the inverter at this time, the system is turned off, and the system is operated at 200kw, so that it can be seen that the shutdown of the faulty inverter is more than 50kw than the common derating, and if the faulty inverter is switched to the main inverter at this time, the parallel system of multiple inverters is directly caused to break down.
As can be seen from the foregoing, the corresponding master switching rule may be preset, so that after at least one target slave inverter that does not fail is determined from among the slave inverters, derating operation may be further performed on each target slave inverter in the multi-inverter parallel system, and derating operation power of each target slave inverter after the derating operation is evaluated according to the master switching rule, so as to determine whether there is a slave inverter to be switched that satisfies the master switching rule from each target slave inverter, and whether there is a faulty inverter that needs to be turned off, so as to ensure normal operation of the multi-inverter parallel system after switching of the master inverter.
Specifically, the derated running power after the derating operation of each target slave inverter is taken as an independent variable, the shutdown or the integral derating of the multi-inverter parallel system is taken as the output result guide, and a corresponding system derating expected calculation function is constructed, as shown in a formula (1).
E(s 1 ,s 2 ,...,s n )＝f(p 1 ,p 2 ,...,p n )
Wherein p is i Derating operating power for the ith target slave inverter, s i For the ith purposeMarking the operating state of the inverter.
When s is i When the value is equal to 0, the operation state of the ith inverter is shut down, and when the value is equal to 1, the operation state of the ith inverter is operated.
In the embodiment of the application, the slave inverter to be switched which meets the host switching rule can be determined from the slave inverters according to the constructed system derating expected function and the derating power information of each target slave inverter.
Optionally, according to the constructed derating expected function of the system and the derating power information of each target slave inverter, the process of determining the slave inverter to be switched, which meets the rule of switching the master, from the target slave inverters may be as follows: sequencing the target slave inverters from large to small according to the de-rated running power of each target slave inverter after de-rating operation to obtain an inverter sequence; calculating a derating desire of the system based on the operating power of the first target slave inverter and the derating operating power of the second target slave inverter; the first target slave inverter and the second target slave inverter are two target slave inverters which are arranged at the tail in an inverter sequence, and the derated operation power of the first target slave inverter is larger than that of the second target slave inverter; if the system derating expectations meet a preset derating threshold, determining a slave inverter to be switched by a first target slave inverter, and closing a second target slave inverter; and if the system reduction expectation does not meet the preset derating threshold, determining the slave inverter to be switched from the second target slave inverter.
It should be noted that, in the case where the system derating calculated from the derated running power of the first target slave inverter and the derated running power of the second target slave inverter is expected to satisfy the preset derating threshold, the derating amount of the second target slave inverter is explained to be maximum, and if the derating amount is performed together according to the derating amount of the second target slave inverter, normal operation of the multiple inverter parallel system may be affected, so that the second target slave inverter may be turned off, avoiding affecting normal operation of the multiple inverter parallel system.
As a preferred mode of the embodiment of the present application, the calculation process of the derating expectations of the system may be: calculating a product of the derated operating power of the first target slave inverter and the first coefficient, and a product of the derated operating power of the second target slave inverter and the second coefficient; and calculating the difference value of the product of the derated running power of the first target slave inverter and the first coefficient and the product of the derated running power of the second target slave inverter and the second coefficient to obtain the derated power of the system.
It should be noted that, the first coefficient is smaller than the second coefficient, for example, the first coefficient may be 4, the second coefficient may be 7.5, the preset derating threshold may be 0, and the first coefficient may be set according to practical application, which is not limited in the embodiment of the present application.
In this embodiment, the system derating desire to meet the preset derating threshold may be that the system derating threshold is greater than the preset derating threshold; the system derating expectation that the preset derating threshold is not met may be that the system derating threshold is not greater than the preset derating threshold, which is not limited in this embodiment of the present application.
For example, assuming that a total of 5 target slave inverters are connected in parallel, the derated operating power is p1, p2, … … and p5 in sequence, the derated operating power of each target slave inverter after the derating operation is performed according to the constructed system derating expected function, the target slave inverters are ordered from large to small to obtain an inverter sequence of p1> p2> … > p5, and the target slave inverter number 4 is determined to be the first target slave inverter from the inverter sequence, and the target slave inverter number 5 is determined to be the second target slave inverter.
Assuming that the first coefficient is 4, the second coefficient is 7.5, the preset derating threshold may be 0; the product of the derated operation power of the first target slave inverter and the first coefficient is 4 x p4, the product of the derated operation power of the second target slave inverter and the second coefficient is 7.5 x p5, and the derated power of the system is 4 x p4-7.5 x p5; if 4×p4> is 7.5×p5, it may be determined that the system derate is expected to meet the preset derate threshold, and then the first target slave inverter may be determined to be switched to the slave inverter, and the second target slave inverter may be turned off, that is, the target No. 4 slave inverter is determined to be switched to the slave inverter, and the target No. 5 slave inverter is turned off.
S204: and switching the master inverter into the slave inverter to be switched, and controlling the switched master inverter to send synchronous clock signal reference current signals to each target slave inverter.
In the specific execution process of step S204, after determining the slave inverter to be switched from each target slave inverter, the master inverter is switched to the slave inverter to be switched, and the switched master inverter is controlled to send a synchronous clock signal reference current signal to each target slave inverter, so that the normal operation of the slave inverter is ensured under the condition that the master inverter fails and stops, and the problem of paralysis of the multi-inverter parallel system is avoided.
The switching from the inverter to the master inverter means that the operation mode of the slave inverter to be switched is switched to the master operation mode.
It should also be noted that the host operation mode may include the method for controlling power of the multi-inverter parallel system provided by the embodiment of the present application.
S205: and determining a system fault expected value, a system fault quantity value and a system power expected value according to the equipment state and the power information of each inverter.
In the process of specifically executing step S205, in order to further ensure the normal operation of the multi-inverter parallel system in the case where it is determined that the main inverter has not failed, a system failure expected value and a system failure number value may be further determined according to the device states of the respective inverters, and a system power expected value may be determined according to the power information of each inverter, so as to determine whether the main inverter switching is currently required or whether the multi-inverter parallel system needs to be stopped according to the shutdown expectation of the multi-inverter parallel system.
In this embodiment, the device state, the system fault quantity value, and the running power of the inverters in the multi-inverter parallel system may be used as independent variables, and the shutdown expectation of the multi-inverter parallel system may be used as the output result, so as to construct a corresponding shutdown expectation calculation function, as shown in formula (2).
E(s 1 ,s 2 ,...,s n )＝g(w 1 f 1 (x 1 ,x 2 ,...,x n ),w 2 f 2 (m),w 3 f 3 (p 1 ,p 2 ,...,p n )) (2)
Wherein E is the expected shutdown, s i For the operating state of the ith inverter, f 1 As a system failure expectation function, w 1 Weights, x, corresponding to system failure expectation functions i For the device status of the ith inverter, f 2 As a system failure number expectation function, w 2 The weight corresponding to the expected function of the number of system faults is that m is the number of inverters with equipment states of preset fault states, and f 3 As a system power expectation function, w 3 Weights corresponding to system power expectation functions, p i For the operating power of the ith inverter, n is the number of inverters in the multiple inverter parallel system.
When s is i When the value is equal to 0, the operation state of the ith inverter is shut down, and when the value is equal to 1, the operation state of the ith inverter is operated.
In some embodiments, the system fault expectation value may be determined from the constructed shutdown expectation calculation function and the device state and system fault expectation function of each inverter, the system fault quantity value is determined from the constructed shutdown expectation calculation function, the device state and system fault quantity expectation function of each inverter, and the system power expectation value is determined from the constructed shutdown expectation calculation function, the operating power in the power information of each inverter, and the system power expectation function.
S207: and calculating the shutdown expectation of the multi-inverter parallel system according to the expected value of the system faults, the expected value of the system fault quantity and the expected value of the system power.
In the embodiment of the application, after the expected value of the system fault, the value of the system fault quantity and the expected value of the system power are calculated, the weight corresponding to the expected value of the system fault, the weight corresponding to the value of the system fault quantity and the weight corresponding to the expected value of the system power can be further determined, and the shutdown expectation of the multi-inverter parallel system is determined according to the expected value of the system fault and the weight thereof, the value of the system fault quantity and the weight thereof, and the expected value of the system power and the weight thereof.
The weight corresponding to the expected value of the system fault is the weight corresponding to the expected function of the system fault, the weight corresponding to the value of the system fault is the weight corresponding to the function of the number of the system fault, and the weight corresponding to the expected value of the system power is the weight corresponding to the expected function of the system power.
For example, the multi-inverter parallel system has 5 inverters, the number 1 is a main inverter, at a certain moment, the number 2 and the number 3 inverters report island faults, the number 4 reports overvoltage faults, and the number 1 and the number 5 normally run in full load, then the expected function of the system fault can be determined to be f1 (0, island, overvoltage and 0) according to the equipment state and the power information of each inverter, and the expected value of the system fault can be determined to be 3; the expected number of system faults can be f2 (2), and then the system fault number value can be determined to be 2; the system power expectation function may be f3 (p 1, p 5), and the system power expectation value may be determined to be 2.
Assuming that the weight corresponding to the expected function of the system fault is 0.5, the weight corresponding to the expected number of the system faults is 0.3, the weight corresponding to the expected function of the system power is 0.1, and the weight corresponding to the other expected functions is 0.1, then the expected value of the system fault and the weight thereof, the number of the system fault and the weight thereof, the expected value of the system power and the weight thereof and the weight corresponding to the other expected functions are weighted and calculated, so that the shutdown expected of the multi-inverter parallel system can be 2.3, wherein a specific calculation mode is shown in a formula (3).
w1*f1+w2*f2+w3*f3＝(0.5*3+0.3*2+0.1*2+0.1*0)/(0.5+0.3+0.1+0.1)＝2.3 (3)
It should be noted that, 0 in the system fault expectation function indicates that the device state is not the preset fault state.
S208: judging whether the shutdown expectation is within a preset expectation range or not; if the shutdown expectation is within the preset expectation range, returning to the step S202; if the shutdown expectation is greater than any one of the preset expectation values within the preset expectation range, step S209 is performed.
In this embodiment, a corresponding preset expected range may be preset, and a corresponding fault linkage rule may be set. Wherein, the fault linkage rule may indicate: if the shutdown expectation is smaller than any one preset expected value in the preset expected range, the current system operation is stable, and the main inverter switching can be omitted or the shutdown of the multi-inverter parallel system can be omitted. If the shutdown desire is within the preset desired range, it indicates that the current system needs to perform the main inverter switching, and then step S202 may be performed to perform the corresponding main inverter switching. If the shutdown expectation is larger than any preset expected value in the preset expected range, a certain risk exists in the current continuous operation of the system, and the shutdown of the multi-inverter parallel system can be controlled.
In the specific execution of step S208, after the shutdown expectation of the multi-inverter parallel system is calculated, whether the main inverter needs to be switched or whether the multi-inverter parallel system needs to be controlled at present may be further determined according to the shutdown expectation, the preset expectation range and the fault linkage rule.
Specifically, according to the expected shutdown, the preset expected range and the fault linkage rule, the process of judging whether the switching of the main inverter is needed or not or whether the shutdown of the multi-inverter parallel system needs to be controlled may be: judging whether the shutdown expectation is within a preset expectation range, if so, indicating that the current system needs to perform main inverter switching, and further executing step S202 to perform corresponding main inverter switching; if the shutdown expectation is greater than any one of the preset expectation values within the preset expectation range, it may be considered that there is a certain risk of the system currently continuing to operate, and further the multi-inverter parallel system may be controlled to shutdown, that is, step S209 is performed. If the shutdown expectation is smaller than any one preset expected value in the preset expected range, the current system operation is stable, and the current operation mode is continuously maintained.
S209: and controlling the multi-inverter parallel system to stop.
In the specific execution of step S209, if it is determined that the shutdown expectation is greater than any one of the preset expected values within the preset expected range, it may be considered that a certain risk exists in the current continuous operation of the system, so that the shutdown of the multi-inverter parallel system may be controlled, and the multi-inverter parallel system is prevented from generating a fault in the operation process.
The application provides a power control method of a multi-inverter parallel system, which can switch a main inverter into a to-be-switched auxiliary inverter which does not have faults and meets the switching rule of a host under the condition that the main inverter has faults, so that the switched main inverter is used for sending synchronous clock signal reference current signals to each target auxiliary inverter, thereby ensuring the normal operation of the auxiliary inverter under the condition that the main inverter has faults and stops, and avoiding the problem of paralysis of the multi-inverter parallel system; under the condition that the main inverter does not have a fault, the shutdown expectation of the multi-inverter parallel system can be further calculated, so that when the shutdown expectation is in a preset expected range, a corresponding main inverter switching process is executed, and the fault of the multi-inverter parallel system caused by the continuous operation of the current main inverter is avoided; and if the shutdown expectation is larger than any preset expected value in a preset expected range, the system can be considered to have a certain risk of continuous operation at present, and further the shutdown of the multi-inverter parallel system can be controlled, so that the multi-inverter parallel system is prevented from generating faults in the operation process.
Further, in order to further ensure the normal operation of the multi-inverter parallel system, before the master inverter after the switching is controlled to send the synchronous clock signal reference current signal to each target slave inverter, a target system fault expected value, a target system fault quantity value and a target system power expected value can be further determined according to the equipment state and derated power information of each target inverter, and a target shutdown expected of the multi-inverter parallel system after the switching of the master inverter is calculated according to the target system fault expected value, the target system fault quantity value and the target system power expected value; and judging whether the main inverter switching is required to be carried out again at present or whether the multi-inverter parallel system shutdown after the main inverter switching is required to be controlled or not according to the target shutdown expectation, the preset expected range and the fault linkage rule. Wherein each target inverter includes a slave inverter to be switched, which is switched to a master inverter, and each target slave inverter.
It should be noted that, the expected shutdown calculation function constructed according to the formula (2) may determine the expected target system failure value according to the equipment status and the expected system failure function of each target inverter, determine the expected target system failure value according to the equipment status and the expected system failure number function of each target inverter, and determine the expected target system power value according to the operating power and the expected system power function in the derated power information of each target inverter.
And determining the weight corresponding to the expected value of the target system fault, the weight corresponding to the expected value of the target system fault number and the weight corresponding to the expected value of the target system power, and determining the shutdown expectation of the multi-inverter parallel system according to the expected value of the target system fault and the weight thereof, the expected value of the target system fault number and the weight thereof, and the expected value of the target system power and the weight thereof.
Judging whether the target shutdown expectation is within a preset shutdown range, if the target shutdown expectation is larger than any preset expected value within the preset expected range, considering that the multi-inverter parallel system after switching the main inverter has a certain risk if the multi-inverter parallel system continues to operate currently, and controlling the multi-inverter parallel system after switching the main inverter to shutdown; if the target shutdown is expected to be within the preset expected range, which indicates that the currently-switched main inverter may not be suitable, the process of performing the main inverter switching may be further returned, that is, the step S202 may be performed. If the target shutdown expectation is smaller than any one preset expected value in the preset expected range, the multi-inverter parallel system after switching the main inverter can run stably, the main inverter can not be switched, and the multi-inverter parallel system can not be controlled to shutdown.
Corresponding to the power control method of the multi-inverter parallel system provided by the embodiment of the application, the embodiment of the application also provides a structural block diagram of a main inverter, as shown in fig. 3, wherein the main inverter comprises a main-slave controller and a fault linkage rule controller;
a failure linkage rule controller for determining at least one target slave inverter which does not fail from among the respective slave inverters according to the device state of each slave inverter when it is determined that the master inverter fails; wherein, each slave inverter and the master inverter belong to the same multi-inverter parallel system; determining slave inverters to be switched which meet a host switching rule from the target slave inverters according to the de-rated power information of each target slave inverter; the de-rated power information of the target slave inverter comprises de-rated running power of the target slave inverter after de-rating operation;
and the master-slave controller is used for switching the master inverter into the slave inverter to be switched and controlling the switched master inverter to send synchronous clock signal reference current signals to each target slave inverter.
In the embodiment of the application, the fault linkage control rule controller is connected with each slave inverter through a CAN bus, and the master-slave controller is respectively connected with each slave inverter and the fault linkage control rule controller, as shown in figure 4.
The application provides a power control system of a multi-inverter parallel system, when judging that a main inverter fails, determining at least one target slave inverter which does not fail from all slave inverters according to the equipment state of each slave inverter; wherein, each slave inverter and the master inverter belong to the same multi-inverter parallel system; determining slave inverters to be switched which meet a host switching rule from the target slave inverters according to the de-rated power information of each target slave inverter; the de-rated power information of the target slave inverter comprises de-rated running power of the target slave inverter after de-rating operation; and switching the master inverter into the slave inverter to be switched, and controlling the switched master inverter to send synchronous clock signal reference current signals to each target slave inverter. According to the technical scheme provided by the application, under the condition that the main inverter fails, the main inverter can be switched into the to-be-switched auxiliary inverter which does not fail and meets the switching rule of the main machine, so that the synchronous clock signal reference current signals are sent to each target auxiliary inverter by using the switched main inverter, and the problem that the auxiliary inverter normally operates under the condition that the main inverter fails and stops is solved, and the parallel system of multiple inverters is prevented from being paralyzed.
Optionally, according to the derated power information of each target slave inverter, determining a fault linkage rule controller of the slave inverter to be switched, which meets the rule of host switching, from the target slave inverters, wherein the fault linkage rule controller is specifically used for:
controlling each target slave inverter to perform derating operation;
sequencing the target slave inverters from large to small according to the de-rated running power of each target slave inverter after de-rating operation to obtain an inverter sequence;
calculating a system derating desire based on the derated operating power of the first target slave inverter and the derated operating power of the second target slave inverter; the first target slave inverter and the second target slave inverter are two target slave inverters which are arranged at the tail in an inverter sequence, and the derated operation power of the first target slave inverter is larger than that of the second target slave inverter;
if the system derating expectations meet a preset derating threshold, determining a slave inverter to be switched by a first target slave inverter, and closing a second target slave inverter;
and if the system reduction expectation does not meet the preset derating threshold, determining the slave inverter to be switched from the second target slave inverter.
Optionally, the expected failure linkage rule controller for derating the system is calculated according to the derated running power of the first target slave inverter and the derated running power of the second target slave inverter, and is specifically used for:
Calculating a product of the derated operating power of the first target slave inverter and the first coefficient, and a product of the derated operating power of the second target slave inverter and the second coefficient; wherein the first coefficient is less than the second coefficient;
and calculating the difference value of the product of the derated running power of the first target slave inverter and the first coefficient and the product of the derated running power of the second target slave inverter and the second coefficient to obtain the derated power of the system.
Optionally, the fault linkage rule controller is specifically configured to:
acquiring the equipment state of the main inverter, and judging whether the equipment state of the main inverter is any one of a plurality of preset fault states;
if the equipment state of the main inverter is any one of a plurality of preset fault states, judging that the main inverter has faults;
if the equipment state of the main inverter is not any one of a plurality of preset fault states, judging that the main inverter does not have faults.
Optionally, when it is determined that the master inverter fails, determining at least one target slave inverter that fails from the slave inverters according to the device status of each slave inverter, wherein the fault linkage rule controller is specifically configured to:
For each slave inverter, when the master inverter is judged to be faulty, judging whether the equipment state of the slave inverter is any one of a plurality of preset fault states;
if the equipment state of the slave inverter is any one of a plurality of preset fault states, judging that the slave inverter has faults;
if the equipment state of the slave inverter is not any one of a plurality of preset fault states, judging that the slave inverter does not have faults, and determining the non-faulty inverter as a target slave inverter.
Optionally, the fault linkage rule controller is further configured to: when it is determined that the slave inverter fails, the slave inverter is turned off.
Optionally, the fault linkage rule controller is further configured to:
when the main inverter is judged to have no faults, determining a system fault expected value, a system fault quantity value and a system power expected value according to the equipment states and the power information of each inverter; wherein each inverter includes each slave inverter and a master inverter;
calculating a shutdown expectation of the multi-inverter parallel system according to the expected value of the system fault, the value of the system fault quantity and the expected value of the system power;
accordingly, when it is determined that the master inverter has failed, determining at least one target slave inverter, from among the respective slave inverters, that has not failed according to the device state of each slave inverter, includes:
When it is determined that the master inverter has failed, or when it is determined that the master inverter has not failed and the shutdown desire is within a preset desired range, at least one target slave inverter that has not failed is determined from among the respective slave inverters according to the device status of each slave inverter.
Optionally, according to the expected value of system fault, the expected value of system fault quantity and the expected value of system power, the expected fault linkage rule controller for stopping the parallel system of the multiple inverters is calculated, and the controller is specifically used for:
determining a weight corresponding to the expected value of the system fault, a weight corresponding to the value of the system fault quantity and a weight corresponding to the expected value of the system power;
and determining the shutdown expectation of the multi-inverter parallel system according to the expected value and the weight of the system faults, the number value and the weight of the system faults and the expected value and the weight of the system power.
Optionally, the fault linkage rule controller is further configured to:
and if the shutdown expectation is larger than any one preset expected value in the preset expected range, controlling the multi-inverter parallel system to shutdown.
Optionally, before the master-slave controller controls the switched master inverter to send the synchronous clock signal reference current signal to each target slave inverter, the fault linkage rule controller is further configured to:
Determining a target system fault expected value, a target system fault quantity value and a target system power expected value according to the equipment state and derated power information of each target slave inverter;
calculating a target shutdown expectation of the multi-inverter parallel system according to the target system fault expected value, the target system fault quantity value and the target system power expected value;
if the target shutdown expectation is larger than any preset expected value in a preset expected range, controlling the multi-inverter parallel system to shutdown after switching the main inverter;
correspondingly, the controller controls the master-slave controller which is used for transmitting the synchronous clock signal reference current signal to each target slave inverter by the switched master inverter, and is also used for: and if the target shutdown expectation is within the preset expectation range, switching the master inverter into the slave inverter to be switched.
Optionally, the fault linkage rule controller is further configured to:
and if the fault quantity value of the target system is larger than the preset fault threshold value, controlling the multi-inverter parallel system to stop after the main inverter is switched.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A method for controlling power of a multi-inverter parallel system, the method comprising:
when it is determined that the master inverter fails, determining a plurality of target slave inverters from among the respective slave inverters that do not fail according to the device state of each slave inverter; wherein each slave inverter and the master inverter belong to the same multi-inverter parallel system;
determining a slave inverter to be switched which meets a master switching rule from the target slave inverters according to the derated power information of each target slave inverter; the de-rated power information of the target slave inverter comprises de-rated running power of the target slave inverter after de-rated operation;
and switching the slave inverter to be switched into a master inverter, and controlling the master inverter after switching to send synchronous clock signal reference current signals to the target slave inverters.
2. The method of claim 1, wherein determining, from each of the target slave inverters, a slave inverter to be switched that satisfies a master switching rule based on derated power information of each of the target slave inverters, comprises:
Controlling each target slave inverter to perform derating operation;
sequencing each target slave inverter from large to small according to the de-rated running power of each target slave inverter after de-rating operation to obtain an inverter sequence;
calculating a system derating desire based on the derated operating power of the first target slave inverter and the derated operating power of the second target slave inverter; the first target slave inverter and the second target slave inverter are two target slave inverters which are arranged at the tail in the inverter sequence, and the de-rated operation power of the first target slave inverter is larger than that of the second target slave inverter;
if the system derating expectations meet a preset derating threshold, determining the slave inverter to be switched by the first target slave inverter, and closing the slave inverter of the second target;
and if the system reduces the expectation that the preset derating threshold is not met, determining the slave inverter to be switched from the second target slave inverter.
3. The method of claim 2, wherein calculating the system derate desire based on the derate operating power of the first target slave inverter and the derate operating power of the second target slave inverter comprises:
Calculating a product of the derated operating power of the first target slave inverter and the first coefficient, and a product of the derated operating power of the second target slave inverter and the second coefficient; wherein the first coefficient is smaller than the second coefficient;
and calculating a difference value of a product of the derated running power of the first target slave inverter and the first coefficient and a product of the derated running power of the second target slave inverter and the second coefficient to obtain the system derated power.
4. The method of claim 1, wherein determining whether the primary inverter has failed comprises:
acquiring the equipment state of the main inverter, and judging whether the equipment state of the main inverter is any one of a plurality of preset fault states;
if the equipment state of the main inverter is any one of the preset fault states, judging that the main inverter has faults;
and if the equipment state of the main inverter is not any one of the preset fault states, judging that the main inverter is not faulty.
5. The method according to claim 4, wherein when it is determined that the master inverter has failed, determining at least one target slave inverter that has not failed from the respective slave inverters according to the device state of each of the slave inverters, comprises:
For each of the slave inverters, when the master inverter is judged to be faulty, judging whether the equipment state of the slave inverter is any one of a plurality of preset fault states;
if the equipment state of the slave inverter is any one of the preset fault states, judging that the slave inverter has faults;
and if the equipment state of the slave inverter is not any preset fault state in the plurality of preset fault states, judging that the slave inverter does not have faults, and determining the non-faulty inverter as a target slave inverter.
6. The method of claim 5, wherein the method further comprises:
and when the slave inverter is judged to be faulty, the slave inverter is closed.
7. The method according to claim 4, wherein the method further comprises:
when the main inverter is judged to have no faults, determining a system fault expected value, a system fault quantity value and a system power expected value according to the equipment states and the power information of the inverters; wherein each of the inverters includes each of the slave inverter and the master inverter;
Calculating a shutdown expectation of the multi-inverter parallel system according to the expected system fault value, the expected system fault quantity value and the expected system power value;
accordingly, when it is determined that the master inverter fails, determining at least one target slave inverter that does not fail from among the respective slave inverters according to the device state of each of the slave inverters, includes:
when it is determined that the master inverter has failed, or when it is determined that the master inverter has not failed and the shutdown expectation is within a preset expectation range, at least one target slave inverter that has not failed is determined from the respective slave inverters according to the device state of each of the slave inverters.
8. The method of claim 7, wherein calculating a shutdown expectation for the multiple inverter parallel system based on the expected value of system faults, the magnitude of system faults, and the expected value of system power comprises:
and determining shutdown expectations of the multi-inverter parallel system according to the weights of the expected values of the system faults and the corresponding weights of the expected values of the system faults, the weights of the number of the system faults and the corresponding weights of the expected values of the system power.
9. The method of claim 8, wherein the method further comprises:
and if the shutdown expectation is larger than any preset expected value in the preset expected range, controlling the multi-inverter parallel system to shutdown.
10. The method of claim 1, wherein prior to controlling the master inverter after switching to send a synchronous clock signal reference current signal to each of the target slave inverters, the method further comprises:
determining a target system fault expected value, a target system fault quantity value and a target system power expected value according to the equipment state and derated power information of each target inverter; wherein each of the target inverters includes the slave inverter to be switched that is switched to a master inverter and each of the target slave inverters;
calculating a target shutdown expectation of the multi-inverter parallel system according to the target system fault expected value, the target system fault quantity value and the target system power expected value;
if the target shutdown expectation is larger than any preset expected value in a preset expected range, controlling the multi-inverter parallel system to shutdown after switching the main inverter;
Correspondingly, before the master inverter after the control switch sends the synchronous clock signal reference current signals to each target slave inverter, the method comprises the following steps:
and if the target shutdown expectation is within the preset expectation range, controlling the switched master inverter to send synchronous clock signal reference current signals to each target slave inverter.
11. The method according to claim 10, wherein the method further comprises:
and if the target system fault quantity value is larger than a preset fault threshold value, controlling the multi-inverter parallel system to stop after the main inverter is switched.
12. The main inverter is characterized by comprising a master-slave controller and a fault linkage rule controller;
the fault linkage rule controller is used for determining at least one target slave inverter which does not have faults from the slave inverters according to the equipment state of each slave inverter when the master inverter is judged to have faults; wherein each slave inverter and the master inverter belong to the same multi-inverter parallel system; determining a slave inverter to be switched which meets a master switching rule from the target slave inverters according to the derated power information of each target slave inverter; the de-rated power information of the target slave inverter comprises de-rated running power of the target slave inverter after de-rated operation;
The master-slave controller is used for switching the master inverter into the slave inverter to be switched and controlling the master inverter after switching to send synchronous clock signal reference current signals to each target slave inverter.
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