CN111474429A - Aging mutual-aid system and method of light storage all-in-one machine - Google Patents
Aging mutual-aid system and method of light storage all-in-one machine Download PDFInfo
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- CN111474429A CN111474429A CN202010297805.2A CN202010297805A CN111474429A CN 111474429 A CN111474429 A CN 111474429A CN 202010297805 A CN202010297805 A CN 202010297805A CN 111474429 A CN111474429 A CN 111474429A
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Abstract
The application provides an aging mutual-aid system and method of a light storage all-in-one machine, and the system comprises: the device comprises a direct-current power supply and two optical storage integrated machines to be subjected to aging test; PV ends, battery ends, grid connection ends, grid disconnection ends and communication ends of the two light storage integrated machines are correspondingly connected respectively; PV ends of the two light storage integrated machines are connected with a direct current power supply; because the battery ends of the two light storage integrated machines are interconnected, the bidirectional direct current source of the battery can be simulated, the off-grid end can be interconnected to simulate the load, and the grid can be simulated after the grid-connected end is interconnected, the two light storage integrated machines can realize energy self-circulation to replace the bidirectional direct current source and the load of the simulated battery which is truly configured, and further, the light storage integrated machines can be mutually assisted pairwise and can help each other to realize aging; in addition, only one direct current power supply for simulating photovoltaic needs to be configured, so that compared with the existing scheme, the method and the device reduce the resources required by the aging test, reduce the cost required by the aging test and improve the aging test efficiency.
Description
Technical Field
The invention relates to the technical field of aging tests, in particular to an aging mutual-aid system and method of an optical storage all-in-one machine.
Background
In the power equipment industry, before the produced power conversion equipment leaves a factory, an aging test is required, that is, all power circuits of the equipment are operated for a period of time under the working condition close to full load so as to verify the stability of the equipment. In the aging test process, each device and each loop in the equipment need to be in a working state, so that the sufficient aging of the equipment can be ensured.
The optical storage product, especially the optical storage all-in-one machine, has more external power interfaces, so the aging test operation process is more tedious. In the aging test mode of the existing light storage integrated machine, at least one direct current source for simulating photovoltaic, a bidirectional direct current source for simulating a battery, a transformer connected with a power grid and a load are required to be equipped for the aging test, and the aging test has the advantages of more resources, high cost and low efficiency.
Disclosure of Invention
Therefore, the aging mutual-aid system and method of the optical storage all-in-one machine are provided, and the problems that the existing aging mode needs more resources, is high in cost and is low in efficiency are solved.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the application first aspect discloses an ageing system that helps each other of light storage all-in-one, includes: the device comprises a direct-current power supply and two optical storage integrated machines to be subjected to aging test;
PV ends, battery ends, grid connection ends, off-grid ends and communication ends of the two light storage integrated machines are correspondingly connected respectively;
PV ends of the two light storage integrated machines are connected with the direct current power supply.
Optionally, in the aging mutual aid system of the optical storage all-in-one machine, the communication ends of the two optical storage all-in-one machines are in direct communication connection.
Optionally, in the aging mutual aid system of the optical storage all-in-one machine, the communication ends of the two optical storage all-in-one machines are in communication connection through an upper computer.
Optionally, in the aging mutual aid system of the light storage all-in-one machine, the grid-connected ends of the two light storage all-in-one machines are connected with a power grid.
Optionally, in the aging mutual aid system of the light storage all-in-one machine, the light storage all-in-one machine includes: the photovoltaic grid-connected inverter comprises a PV conversion module, a battery conversion module, a direct current bus capacitor, an inversion module, a grid-connected relay, an off-grid relay and a control system;
the input side of the PV conversion module is used as the PV end of the light storage all-in-one machine, and the output side of the PV conversion module is connected with the direct current side of the inversion module;
one side of the battery conversion module is used as a battery end of the light storage integrated machine, and the other side of the battery conversion module is connected with the direct current side of the inversion module;
the alternating current side of the inversion module is connected with the grid-connected end of the light storage all-in-one machine through the grid-connected relay, and the alternating current side of the inversion module is also connected with the off-grid end of the light storage all-in-one machine through the off-grid relay;
the direct current bus capacitor is arranged between a positive electrode and a negative electrode of the direct current side of the inversion module;
one side of the control system is respectively connected with the PV transformation module, the battery transformation module, the inversion module, the grid-connected relay and the control end of the off-grid relay, and the other side of the control system is used as the communication end of the light storage all-in-one machine.
Optionally, in the aging mutual aid system of the light storage all-in-one machine, the off-grid ends of the two light storage all-in-one machines are connected to a power grid.
Optionally, in the aging mutual aid system of the light storage all-in-one machine, the light storage all-in-one machine further includes: and the bypass switch is arranged between the grid-connected end and the off-grid end of the light storage all-in-one machine.
Optionally, the number of the direct current power supplies is two, and PV ends of the two light storage integrated machines are respectively connected with different direct current power supplies.
The second aspect of the application discloses an aging mutual-aid method of an optical storage all-in-one machine, which is applied to any one of the aging mutual-aid systems of the optical storage all-in-one machine disclosed by the first aspect, and the aging mutual-aid method comprises steps S101, S102 and S103 which are executed simultaneously; and, step S103 includes steps S301 and S302 performed in divided periods; wherein:
s101, controlling two PV transformation modules in the aging mutual aid system to work in a normal mode;
s102, controlling two battery transformation modules in the aging mutual-aid system to work in a voltage source mode in turn, and controlling the other battery transformation module to work in a current source mode when one battery transformation module works in the voltage source mode;
s301, controlling two light storage integrated machines in the aging mutual-aid system to operate in a grid-connected mode;
s302, controlling the two light storage integrated machines to run off the network, alternately operating the two inversion modules in the aging mutual-aid system in a voltage source mode, and controlling one inversion module to operate in the voltage source mode and the other inversion module to operate in a current source mode when the other inversion module operates in the voltage source mode.
Optionally, in the aging mutual assistance method of the light-storing all-in-one machine, if the light-storing all-in-one machine does not have a bypass switch, step S301 includes:
and controlling the on-off of the grid-connected relay and the off-grid relay in the two light storage integrated machines, and carrying out grid-connected operation on the two inversion modules.
Optionally, in the aging mutual assistance method of the light-storing all-in-one machine, if the light-storing all-in-one machine is provided with a bypass switch, step S103 includes only step S301, and step S301 at this time includes:
and controlling a grid-connected relay and a bypass switch in one of the light storage all-in-one machines to be closed and an off-grid relay to be opened, controlling a grid-connected relay and a bypass switch in the other light storage all-in-one machine to be opened and an off-grid relay to be closed, carrying out grid-connected operation on the two inversion modules, and then continuing the grid-connected operation after the two light storage all-in-one machines exchange the states of an alternating-current side switch.
Optionally, in the aging mutual assistance method of the light storage all-in-one machine, if the grid-connected ends of the two light storage all-in-one machines are both connected to a power grid, the two inverter modules are operated in a grid-connected mode, and the aging mutual assistance method includes: two inversion modules in the aging mutual-aid system work in a current source mode;
if the grid-connected ends of the two light storage integrated machines are not connected with the power grid, the two inversion modules are operated in a grid-connected mode, and the method comprises the following steps: two inversion modules in the aging mutual-aid system work in a voltage source mode in turn, and when one inversion module works in the voltage source mode, the other inversion module works in a current source mode.
Optionally, in the aging mutual assistance method of the optical storage all-in-one machine, if the inverter module of the optical storage all-in-one machine is a multi-phase inverter module, the method further includes, while the two inverter modules are in grid-connected operation:
for the multiphase inversion module working in the current source mode, the reference value of the output current of each phase is controlled to be different from the reference values of the output currents of other phases one by one, so that the output current of each phase is in an unbalanced state.
Optionally, in the aging mutual aid method of the light storage and integration machine, step S302 includes:
and controlling a grid-connected relay and an off-grid relay in the two light storage integrated machines to be switched off, wherein the two inversion modules work in a voltage source mode and a current source mode respectively, and then the two inversion modules continue to operate after exchanging modes.
Optionally, in the aging mutual assistance method of the optical storage integrated machine, if the inverter module of the optical storage integrated machine is a multi-phase inverter module, the step S302 of controlling another inverter module to operate in a current source mode further includes:
for the multiphase inversion module working in the current source mode, the reference value of the output current of each phase is controlled to be different from the reference values of the output currents of other phases one by one, so that the output current of each phase is in an unbalanced state.
The aging mutual-aid system of the light storage all-in-one machine based on the invention comprises: the device comprises a direct-current power supply and two optical storage integrated machines to be subjected to aging test; the PV ends, the battery ends, the grid connection end, the grid disconnection end and the communication end of the two light storage integrated machines are correspondingly connected respectively; PV ends of the two light storage integrated machines are connected with a direct current power supply; because the battery ends of the two optical storage all-in-one machines are interconnected, the bidirectional direct current source of the battery can be simulated, the off-grid end can be interconnected to simulate the load, and the grid end can be interconnected to simulate the power grid, the two optical storage all-in-one machines can realize energy self-circulation, the bidirectional direct current source and the load of the simulated battery which are truly configured in the prior art are replaced, and further the optical storage all-in-one machines to be subjected to aging test can mutually assist each other pairwise and help each other to realize aging; moreover, the aging mutual-aid system of the light storage all-in-one machine provided by the application only needs to be provided with a photovoltaic simulation direct-current power supply, and compared with the existing aging mode, the aging mutual-aid system reduces resources required by aging test, reduces the cost required by aging test, and improves the aging test efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an aging mutual aid system of an optical storage integrated machine according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an optical storage integrated machine provided in the embodiment of the present application;
fig. 3 is a power flow diagram of an optical storage integrated machine with a bypass switch during grid-connected operation according to an embodiment of the present application;
fig. 4 is a flowchart of an aging mutual aid method of an optical storage integrated machine according to an embodiment of the present application;
fig. 5 is a flowchart of another aging mutual aid method for an optical storage integrated machine according to an embodiment of the present application;
fig. 6 is a schematic diagram of output currents of phases of a three-phase inverter module according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides an aging mutual-aid system of an optical storage all-in-one machine, and aims to solve the problems of multiple resources, high cost and low efficiency of the existing aging mode.
Referring to fig. 1, the aging mutual aid system of the optical storage integrated machine mainly includes: a direct current power supply 101 and two optical storage integrated machines (the optical storage integrated machine 102 shown in fig. 1) to be subjected to aging test.
The light storage all-in-one machine to be subjected to the aging test is a light storage all-in-one machine which needs to be subjected to the aging test but is not subjected to the aging test.
The PV ends (PV shown in fig. 1), the battery ends (Bat shown in fig. 1), the grid-connected ends (On-grid shown in fig. 1), the off-grid ends (Backup shown in fig. 1) and the communication ends (Comm shown in fig. 1) of the two optical storage integrated machines 102 are respectively and correspondingly connected.
PV ends of the two light storage integrated machines 102 are connected with a direct current power supply 101.
The direct current power supply 101 is used for simulating a PV curve or providing a common voltage source so that a PV conversion module in the light storage all-in-one machine 102 can be in a normal working mode, and the PV conversion module and an auxiliary circuit thereof are fully aged.
In this embodiment, after the battery ends of the two optical storage integrated machines 102 are interconnected, a bidirectional direct-current power supply of the battery can be simulated, after the off-grid ends are interconnected, a load can be simulated, after the on-grid ends are interconnected, a power grid can be simulated, so that the two optical storage integrated machines 102 can realize energy self-circulation, and the bidirectional direct-current power supply and the load of the simulated battery truly configured in the prior art are replaced, so that the optical storage integrated machines 102 to be subjected to the aging test can be mutually assisted in pairs and can help each other to age; moreover, the aging mutual-aid system of the light storage all-in-one machine provided by the application only needs to be configured with one photovoltaic simulation direct-current power supply, namely only with the direct-current power supply 101, compared with the existing aging mode, the aging test system reduces the resources required by the aging test, reduces the cost required by the aging test, and improves the aging test efficiency.
It should be further noted that, the aging mutual-aid system of the optical storage all-in-one machine provided by the present application requires fewer resources, and only the PV end, the battery end, the grid-connected end, the grid-disconnected end and the communication end need to be correspondingly connected between the two optical storage all-in-one machines, i.e., the wiring mode of the aging mutual-aid system of the optical storage all-in-one machine provided by the present application is very simple and convenient.
When the Grid-connected ends of the two optical storage integrated machines 102 are not connected to the Grid of the power Grid, one of the optical storage integrated machines 102 is required to simulate the Grid of the power Grid, and in practical application, the Grid-connected ends of the two optical storage integrated machines 102 can also be connected to the Grid of the power Grid (as shown in fig. 1), so that simulation of the optical storage integrated machines 102 to the power Grid is not required.
In addition, in practical application, the number of the dc power supplies 101 may be 1, as shown in fig. 1; certainly, the number of the direct current power supplies 101 may also be 2, that is, each optical storage all-in-one machine is provided with a corresponding direct current power supply, although the cost is slightly higher than that of 1 direct current power supply, the cost is still much lower than that of the prior art; the number of the dc power supplies 101 is not specifically limited in the present application, and all of them belong to the scope of protection of the present application.
In practical application, communication ends of two optical storage all-in-one machines can be in direct communication connection (such as a connection mode shown in fig. 1), the two optical storage all-in-one machines after communication connection can exchange operation information mutually and can manage the time sequence of the whole aging mutual-aid process, and after a system finishes line connection and sets an instruction, the whole aging process comprises operation mode switching, control switching, time sequence management and the like related to the following method, so that the automatic operation can be realized.
Or, the communication ends of the two optical storage integrated machines can also be in communication connection (not shown) through the upper computer, at this time, the two optical storage integrated machines are both in communication with the upper computer, and the upper computer manages the aging process of the two optical storage integrated machines.
In another embodiment provided by the present application, referring to fig. 2, the light-storing all-in-one machine in the aging mutual aid system of the light-storing all-in-one machine mainly includes: PV conversion module 201, battery conversion module 202 and DC bus capacitor CbusThe inverter module 203, the grid-connected relay K1 and the disconnecting switchGrid relay K2, and control system 204.
The input side of the PV conversion module 201 serves as the PV end (PV in fig. 2) of the light-storage all-in-one machine, and the output side is connected with the direct current side of the inverter module 203.
One side of the battery conversion module 202 serves as a battery end (Bat in fig. 2) of the light storage all-in-one machine, and the other side is connected with a direct current side of the inverter module 203.
The alternating current side of the inversion module 203 is connected with the grid-connected end (On-grid in fig. 2) of the optical storage all-in-one machine through a grid-connected relay K1, and the alternating current side of the inversion module 203 is further connected with the off-grid end (Backup in fig. 2) of the optical storage all-in-one machine through an off-grid relay K2.
It should be noted that the PV conversion module 201 includes at least one DCDC conversion circuit, and the DCDC conversion circuit in the PV conversion module 201 is a unidirectional DCDC conversion circuit; when the PV conversion module 201 includes a plurality of DCDC conversion circuits, output sides of the respective DCDC conversion circuits are connected in parallel, and input sides of the respective DCDC conversion circuits are connected in parallel or receive corresponding direct currents, respectively.
The battery conversion module 202 includes at least one DCDC conversion circuit, and the DCDC conversion circuit in the battery conversion module 202 is a bidirectional DCDC conversion circuit; when the battery conversion module 202 includes a plurality of bidirectional DCDC conversion circuits, two sides of each bidirectional DCDC conversion circuit are respectively connected in parallel.
The inverter module 203 includes at least one DCAC conversion circuit, and when the inverter module 203 includes a plurality of DCAC conversion circuits, the ac sides of the DCAC conversion circuits may be connected in parallel or in cascade; the dc sides of the DCAC conversion circuits may be connected in parallel, or the PV conversion modules 201 and the battery conversion modules 202 may be connected to each other.
The structures of the three modules are determined according to the specific application environment, and are not specifically limited herein and all fall within the protection scope of the present application.
DC bus capacitor CbusIs arranged between the positive and negative electrodes (Bus + and Bus-) on the direct current side of the inversion module 203.
One side of the control system 204 is respectively connected with the control ends of the PV transformation module 201, the battery transformation module 202, the inversion module 203, the grid-connected relay K1 and the off-grid relay K2, and the other side of the control system 204 is used as a communication end of the light storage all-in-one machine. In practical application, the control system 204 is further connected to corresponding parameter detection equipment to receive corresponding parameters inside the light storage integrated machine, such as a direct current bus voltage, an alternating current voltage, and the like; as in the prior art, no further description is given here.
Optionally, in practical application, when no bypass switch is arranged between an off-grid end and a grid-connected end in the optical storage all-in-one machine, in the aging mutual-assistance system of the optical storage all-in-one machine, the off-grid ends of the two optical storage all-in-one machines may also be connected to a power grid, so as to realize aging mutual-assistance of the two optical storage all-in-one machines; that is, in the aging process of the two light storage integrated machines, the grid-connected end and the off-grid end of the two light storage integrated machines can be connected with the power grid respectively and simultaneously.
Optionally, in practical applications, referring to fig. 2 as well, the light-storing all-in-one machine may further include: and the Bypass switch Bypass is arranged between a grid-connected end (On-grid in figure 2) and a grid-disconnected end (Backup in figure 2) of the light storage all-in-one machine.
On the basis of the aging mutual-aid system of the optical storage all-in-one machine shown in fig. 1, the present application also provides an aging mutual-aid method of the optical storage all-in-one machine, which is applied to the aging mutual-aid system of the optical storage all-in-one machine described in any one of the above embodiments, and the aging mutual-aid method includes steps S101, S102 and S103 that are executed simultaneously; wherein step S103 includes steps S301 and S302 performed in divided periods; in addition, in practical application, the sequence of steps S301 and S302 is not limited, and the sequence shown in fig. 4 and fig. 5 may be used. Wherein, each step specifically is:
and S101, controlling two PV transformation modules in the aging mutual aid system to work in a normal mode.
The PV conversion module is in a normal working mode of converting electric energy transmitted by the direct-current power supply into electric energy meeting the direct-current side requirement of the inverter module.
The power current of the PV conversion module working in the normal mode is provided by a direct current power supply, and the aging test of the PV conversion module and the auxiliary loop thereof in the light storage all-in-one machine can be realized through the PV conversion module.
S102, controlling two battery transformation modules in the aging mutual-aid system to work in a voltage source mode in turn, and controlling one battery transformation module to work in a current source mode when the other battery transformation module works in the voltage source mode.
The voltage source mode of the battery conversion module is a mode for controlling the battery conversion module to output stable voltage through the battery end. The current source mode of the battery conversion module is a mode for controlling the battery conversion module to output stable current through the battery terminal. When two battery conversion modules in the aging mutual-aid control system work in a voltage source mode in turn, and one battery conversion module works in a voltage source mode, the other battery conversion module is controlled to work in a current source mode, so that the energy self-circulation of a battery end can be realized, the charge and discharge process of the battery is simulated, and the battery conversion modules and the auxiliary loops of the battery conversion modules of two optical storage all-in-one machines to be subjected to aging test in the aging mutual-aid control system are fully aged.
S301, controlling the two light storage all-in-one machines in the aging mutual-aid system to operate in a grid-connected mode.
Specifically, the inverter modules in the two light storage integrated machines are respectively controlled to realize grid-connected operation of the two light storage integrated machines through respective grid-connected relays.
In practical application, if the light storage all-in-one machine does not have a bypass switch, step S301 specifically includes: and controlling the on-off of the grid-connected relay and the off-grid relay in the two light storage integrated machines, and carrying out grid-connected operation on the two inversion modules.
If the optical storage all-in-one machine is provided with a bypass switch, step S103 only includes step S301, and step S301 at this time specifically is: the grid-connected relay and the bypass switch in one light storage all-in-one machine are controlled to be closed and the off-grid relay is controlled to be opened, the grid-connected relay and the bypass switch in the other light storage all-in-one machine are controlled to be opened and the off-grid relay is controlled to be closed, the two inversion modules are in grid-connected operation, and then the two light storage all-in-one machines continue to be in grid-connected operation after the states of the switches on the alternating.
With reference to fig. 3, the optical storage integrated machine has a Bypass switch Bypass, and when step S301 is executed, the power flow on the ac side of the inverter module 203 in the two optical storage integrated machines flows through the following path:
a Grid-connected relay K1 and a Bypass switch Bypass of the light storage all-in-one machine are both closed, and an off-Grid relay K2 is disconnected, as shown in the light storage all-in-one machine in the upper half part of the light storage all-in-one machine shown in figure 3, the light storage all-in-one machine is directly connected with a Grid of a power Grid; a Grid-connected relay K1 and a Bypass switch Bypass in the other light storage all-in-one machine are both disconnected, and an off-Grid relay K2 is closed, for example, the light storage all-in-one machine in the lower half part shown in fig. 3 is connected with a Grid through the Bypass switch Bypass in the light storage all-in-one machine in the upper half part shown in fig. 3; and then the grid-connected operation of the two inversion modules 203 in the two light storage integrated machines can be realized.
After the two inversion modules 203 in the two optical storage all-in-one machines are connected to the grid and run according to the mode, part of the relays which do not pass through the two inversion modules 203 in the optical storage all-in-one machines are stored in the two inversion modules 203, namely, the rest part of loops of the inversion modules 203 are not subjected to aging tests, the two optical storage all-in-one machines are switched to be connected to the grid and run after the switching states of the alternating current side are switched, and therefore the sufficient aging tests of the inversion modules 203, the grid-connected relays, the off-grid relays and the related loops of the two.
And, when the light stores up the all-in-one and has bypass switch, if the contravariant module of light storage all-in-one is heterogeneous contravariant module, then when carrying out two contravariant modules and being incorporated into the power networks the operation in step S301, still include: for a multi-phase inversion module working in a current source mode, the reference value of the output current of each phase is controlled to be different from the reference values of the output currents of other phases one by one, so that the output current of each phase is in an unbalanced state, and the aging of each phase in the multi-phase inversion module is realized.
In addition, no matter whether the light storage all-in-one machine is provided with a bypass switch or not, the following specific modes are applicable to the grid-connected operation of the two inverter modules in the step S301:
(1) if the grid-connected ends of the two light storage integrated machines are connected with the power grid, the two inversion modules in the step S301 run in a grid-connected mode, and the method includes the following steps: and two inverter modules in the aging mutual-aid system work in a current source mode.
(2) If the grid-connected ends of the two light storage integrated machines are not connected with the power grid, the two inversion modules in the step S301 run in a grid-connected mode, and the method comprises the following steps: two inversion modules in the aging mutual-aid system work in a voltage source mode in turn, and when one inversion module works in the voltage source mode, the other inversion module works in a current source mode; namely, one light storage all-in-one machine serves as a voltage source, the other light storage all-in-one machine serves as a current source, the light storage all-in-one machine serving as the voltage source can simulate a power grid, and the other light storage all-in-one machine is aged.
S302, controlling two inversion modules in the two optical storage integrated machines to operate off-grid and aging mutual aid systems to work in a voltage source mode in turn, and controlling one inversion module to work in the voltage source mode and controlling the other inversion module to work in a current source mode when the other inversion module works in the voltage source mode.
The two light storage integrated machines are respectively controlled to realize off-grid operation of the two light storage integrated machines through respective off-grid relays, the two inversion modules are controlled to work in a voltage source mode in turn and provide alternating-current voltage, and when one inversion module works in the voltage source mode, the other inversion module is controlled to work in a current source mode and execute power sending or power absorption operation.
In practical applications, the specific process of executing step S302 is as follows: the grid-connected relay and the off-grid relay in the two light storage integrated machines are controlled to be switched off, the two inversion modules work in a voltage source mode and a current source mode respectively, and then the two inversion modules continue to operate after the modes are interchanged.
Based on the above principle, in this embodiment, after the steps S101, S102, S301, and S302 are executed on two optical storage integrated machines to be subjected to the aging test in the aging mutual aid system of the optical storage integrated machine, loops of each module and device in the optical storage integrated machine have power flows, that is, the loops of each module and device in the optical storage integrated machine can be sufficiently aged, so that the sufficiency of the aging test is ensured; moreover, the aging mutual-aid method provided by the application can finish the aging tests of the two optical storage all-in-one machines only by executing the steps S101 to S302 on the optical storage all-in-one machines, namely the aging tests are simple to operate, the two optical storage all-in-one machines are in a group, the aging is assisted mutually, the aging speed is high, the time required by the aging tests is further shortened, and the aging test efficiency is improved.
It should be noted that, in the prior art, there is also an aging mode in which two inverters are connected together, but in this mode, one inverter simulates a load, and the other simulates a power grid to form an aging test platform, and the other inverter is subjected to an aging test; the aging mutual-aid method of the optical storage all-in-one machine is not provided with a fixed test platform, the optical storage all-in-one machine in the aging mutual-aid system is a test object and a test platform, and aging tests of the two optical storage all-in-one machines can be achieved in mutual aid.
It should be noted that, since the inverter module in the optical storage integrated machine cannot simultaneously perform the grid-connected operation and the off-grid operation, steps S301 and S302 cannot be performed simultaneously. Therefore, in practical applications, step S301 and step S302 are generally executed in time-sharing. Whether the method of performing step S301 or step S302 first is adopted falls within the scope of the present application.
Still to be noted, after the optical storage all-in-one machine is wired according to the wiring mode provided by the aging mutual-aid system of the optical storage all-in-one machine provided by the application, the aging test of the optical storage all-in-one machine can be realized by executing the aging mutual-aid method of the optical storage all-in-one machine provided by the application. Specifically, the aging test can be completed through the automatic operation of the control system in the optical storage all-in-one machine in the aging mutual-aid method, and the problems of high cost and low efficiency caused by manual operation and control of the aging test can be solved.
In practical application, the inversion module arranged in the light storage all-in-one machine has various forms. Specifically, the inverter module may be a single-phase inverter module, or may be a multi-phase inverter module. If the inversion module is a multi-phase inversion module, the step S302 of controlling the two inversion modules to alternately operate in the voltage source mode in the off-grid operation and aging mutual aid system of the two optical storage integrated machines, and when one inversion module operates in the voltage source mode, controlling the other inversion module to operate in the current source mode, further comprising: for the multiphase inversion module working in the current source mode, the reference value of the output current of each phase is controlled to be different from the reference values of the output currents of other phases one by one, so that the output current of each phase is in an unbalanced state.
The inverter module is a multi-phase inverter module, so that a bus voltage balance circuit or a zero line bridge arm of the inverter module needs to be subjected to an aging test, and the phase current output by the inverter module can be controlled to work in an unbalanced state so as to realize the aging of each phase of the multi-phase inverter.
Specifically, the aging of the multiphase inverter can be realized by adjusting the output current reference value of each phase of the multiphase inverter module working in the current mode to be different from the output current reference values of other phases so that the output current of each phase is in an unbalanced state.
It should be noted that the multi-phase inversion module may be a split-phase inversion module or a three-phase inversion module; of course, the present invention is not limited to this, and the specific form of the multi-phase inverter module may also be other existing inverter modules, and the present application does not limit the specific type of the multi-phase inverter module, and all of them belong to the protection scope of the present application.
In conjunction with the above description, and referring to fig. 6, the following is a specific example to further explain the aging process of the three-phase inverter module:
in practical applications, any two-phase current reference value output by the three-phase inverter module may be first adjusted to a maximum value (the current at L1, L2 is shown as a maximum current Full), and the other-phase current reference value is adjusted to 0 (the current at L3 is shown as a zero current).
It should be noted that fig. 6 shows only one specific implementation manner when the inverter module is in the three-phase inverter mode, in practical applications, the aging process is not limited to the above, and only the reference value of the current output by each phase in the three-phase inverter module needs to be adjusted to an unbalanced state, so that the three-phase inverter module can be sufficiently aged.
Features described in the embodiments in the present specification may be replaced with or combined with each other, and the same and similar portions among the embodiments may be referred to each other, and each embodiment is described with emphasis on differences from other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
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 components and steps have been described above generally in terms of their functionality in order to clearly illustrate this 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 implementation. 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 spirit or 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.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (15)
1. The utility model provides an ageing mutual aid system of all-in-one is stored up to light which characterized in that includes: the device comprises a direct-current power supply and two optical storage integrated machines to be subjected to aging test;
PV ends, battery ends, grid connection ends, off-grid ends and communication ends of the two light storage integrated machines are correspondingly connected respectively;
PV ends of the two light storage integrated machines are connected with the direct current power supply.
2. The aging mutual-aid system for the light-storage all-in-one machine according to claim 1, wherein the communication ends of the two light-storage all-in-one machines are in direct communication connection.
3. The aging mutual-aid system for the light storage all-in-one machine according to claim 1, wherein the communication ends of the two light storage all-in-one machines are in communication connection through an upper computer.
4. The aging mutual-aid system for the light storage all-in-one machine according to claim 1, wherein grid-connected ends of the two light storage all-in-one machines are connected with a power grid.
5. An aging mutual aid system for an optical storage integrated machine according to any one of claims 1 to 4, wherein the optical storage integrated machine comprises:
the photovoltaic grid-connected inverter comprises a PV conversion module, a battery conversion module, a direct current bus capacitor, an inversion module, a grid-connected relay, an off-grid relay and a control system;
the input side of the PV conversion module is used as the PV end of the light storage all-in-one machine, and the output side of the PV conversion module is connected with the direct current side of the inversion module;
one side of the battery conversion module is used as a battery end of the light storage integrated machine, and the other side of the battery conversion module is connected with the direct current side of the inversion module;
the alternating current side of the inversion module is connected with the grid-connected end of the light storage all-in-one machine through the grid-connected relay, and the alternating current side of the inversion module is also connected with the off-grid end of the light storage all-in-one machine through the off-grid relay;
the direct current bus capacitor is arranged between a positive electrode and a negative electrode of the direct current side of the inversion module;
one side of the control system is respectively connected with the PV transformation module, the battery transformation module, the inversion module, the grid-connected relay and the control end of the off-grid relay, and the other side of the control system is used as the communication end of the light storage all-in-one machine.
6. The aging mutual-aid system for the light-storage all-in-one machine according to claim 5, wherein off-grid ends of the two light-storage all-in-one machines are connected with a power grid.
7. The light-storage all-in-one machine aging and mutual aid system according to claim 5, wherein the light-storage all-in-one machine further comprises: and the bypass switch is arranged between the grid-connected end and the off-grid end of the light storage all-in-one machine.
8. The aging mutual-aid system for the light-storage all-in-one machine according to any one of claims 1 to 4, wherein the number of the direct current power supplies is two, and PV ends of the two light-storage all-in-one machines are respectively connected with different direct current power supplies.
9. An aging mutual-aid method of an optical storage all-in-one machine, which is applied to the aging mutual-aid system of the optical storage all-in-one machine as claimed in any one of claims 1 to 8, and comprises steps S101, S102 and S103 which are executed simultaneously; and, step S103 includes steps S301 and S302 performed in divided periods; wherein:
s101, controlling two PV transformation modules in the aging mutual aid system to work in a normal mode;
s102, controlling two battery transformation modules in the aging mutual-aid system to work in a voltage source mode in turn, and controlling the other battery transformation module to work in a current source mode when one battery transformation module works in the voltage source mode;
s301, controlling two light storage integrated machines in the aging mutual-aid system to operate in a grid-connected mode;
s302, controlling the two light storage integrated machines to run off the network, alternately operating the two inversion modules in the aging mutual-aid system in a voltage source mode, and controlling one inversion module to operate in the voltage source mode and the other inversion module to operate in a current source mode when the other inversion module operates in the voltage source mode.
10. The aging mutual aid method for the light-storing all-in-one machine according to claim 9, wherein if the light-storing all-in-one machine is not provided with a bypass switch, the step S301 comprises:
and controlling the on-off of the grid-connected relay and the off-grid relay in the two light storage integrated machines, and carrying out grid-connected operation on the two inversion modules.
11. The aging mutual aid method for the light-storing all-in-one machine according to claim 9, wherein if the light-storing all-in-one machine is provided with a bypass switch, step S103 only includes step S301, and step S301 includes:
and controlling a grid-connected relay and a bypass switch in one of the light storage all-in-one machines to be closed and an off-grid relay to be opened, controlling a grid-connected relay and a bypass switch in the other light storage all-in-one machine to be opened and an off-grid relay to be closed, carrying out grid-connected operation on the two inversion modules, and then continuing the grid-connected operation after the two light storage all-in-one machines exchange the states of an alternating-current side switch.
12. The aging mutual aid method for the light storage all-in-one machine according to claim 10 or 11, wherein if the grid-connected ends of the two light storage all-in-one machines are connected with a power grid, the two inverter modules are operated in a grid-connected mode, and the method comprises the following steps: two inversion modules in the aging mutual-aid system work in a current source mode;
if the grid-connected ends of the two light storage integrated machines are not connected with the power grid, the two inversion modules are operated in a grid-connected mode, and the method comprises the following steps: two inversion modules in the aging mutual-aid system work in a voltage source mode in turn, and when one inversion module works in the voltage source mode, the other inversion module works in a current source mode.
13. The aging mutual aid method for the light storage all-in-one machine according to claim 11, wherein if the inversion modules of the light storage all-in-one machine are multiphase inversion modules, the method further comprises the following steps while the two inversion modules are in grid-connected operation:
for the multiphase inversion module working in the current source mode, the reference value of the output current of each phase is controlled to be different from the reference values of the output currents of other phases one by one, so that the output current of each phase is in an unbalanced state.
14. The aging mutual aid method for the light-storing all-in-one machine according to claim 9, wherein the step S302 comprises:
and controlling a grid-connected relay and an off-grid relay in the two light storage integrated machines to be switched off, wherein the two inversion modules work in a voltage source mode and a current source mode respectively, and then the two inversion modules continue to operate after exchanging modes.
15. The aging mutual aid method for the light-storing all-in-one machine according to claim 14, wherein if the inverting module of the light-storing all-in-one machine is a multi-phase inverting module, the step S302 of controlling another inverting module to operate in a current source mode further comprises:
for the multiphase inversion module working in the current source mode, the reference value of the output current of each phase is controlled to be different from the reference values of the output currents of other phases one by one, so that the output current of each phase is in an unbalanced state.
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