Direct-current bus capacitor module and optical storage all-in-one machine system

Abstract

The utility model discloses a direct current bus capacitor module and an optical storage all-in-one machine system. The direct current bus capacitor module is respectively connected with a photovoltaic cell module, an energy storage cell module and an alternating current power grid. The direct-current bus capacitor module comprises a plurality of main bus capacitor units which are connected in parallel, and each main bus capacitor unit is connected with at least one slave bus capacitor unit in parallel. Therefore, when the main bus capacitor unit is damaged, the damaged main bus capacitor unit is firstly closed or cut off, and then the corresponding slave bus capacitor unit is started to replace the damaged main bus capacitor unit, thereby ensuring the normal operation of the DC bus capacitor module.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric energy storage system especially relates to a direct current bus capacitor module and light storage integrated machine system. BACKGROUND

[0002] Light storage integrated machine system is a complex integrated system, which combines solar power generation, power conversion and storage functions, and a direct current bus capacitor module is arranged in the light storage integrated machine system, which plays a role of connecting photovoltaic cell module, energy storage battery module and alternating current power grid respectively, and occupies an important position in the whole system.

[0003] Among them, six bus capacitors are needed in the existing direct current bus capacitor module to maintain normal operation, and referring to the attached Figure 1 The direct current bus capacitor module contains six parallel bus capacitors, but the service life of the capacitor itself is relatively short compared with the whole device due to the characteristics of the capacitor itself in the actual use process. And all the bus capacitors in the previous direct current bus capacitor module are directly connected in parallel to the direct current bus of the light storage integrated machine system, which will cause direct impact on the operation of the whole light storage integrated machine system if there is no replacement bus capacitor for the damaged bus capacitor. SUMMARY

[0004] The utility model provides a direct current bus capacitor module and light storage integrated machine system for solving the problem of no replacement bus capacitor after the bus capacitor in the direct current bus capacitor module in the prior art is damaged.

[0005] The technical scheme of the utility model is a direct current bus capacitor module, which is connected with photovoltaic cell module, energy storage battery module and alternating current power grid respectively; the direct current bus capacitor module comprises a plurality of parallel main bus capacitor units, and each main bus capacitor unit is connected in parallel with at least one slave bus capacitor unit.

[0006] Further, each main bus capacitor unit comprises a main bus capacitor and a first switching device arranged in series.

[0007] Further, each slave bus capacitor unit comprises a slave bus capacitor and a second switching device arranged in series.

[0008] Further, the direct current bus capacitor module further comprises a slave control system, which can be connected with each main bus capacitor unit and each slave bus capacitor unit respectively, and the slave control system is used for switching on and off the corresponding switching device according to the abnormal condition of the bus capacitor.

[0009] Further, the main bus capacitor is any one of an electrolytic capacitor, a film capacitor, a ceramic capacitor and an electric double layer capacitor.

[0010] Further, the first switching device is any one of a relay, a contactor, an IGBT and a MOS tube.

[0011] Further, the slave bus capacitor is any one of an electrolytic capacitor, a film capacitor, a ceramic capacitor and an electric double layer capacitor.

[0012] Further, the second switching device is any one of a relay, a contactor, an IGBT and a MOS tube.

[0013] The utility model also proposes a kind of light storage integrated machine system, and the direct current bus of the light storage integrated machine system is shunt connected with the direct current bus capacitor module described above.

[0014] Further, the light storage integrated machine system further includes a photovoltaic cell module, an energy storage battery module, a photovoltaic DC / DC module, an energy storage DC / DC module and an inverter module.

[0015] The photovoltaic cell module is connected to the direct current bus through the photovoltaic DC / DC module, the energy storage battery module is connected to the direct current bus through the energy storage DC / DC module, and the alternating current power grid is connected to the direct current bus through the inverter module.

[0016] Compared with the prior art, the utility model has at least the following beneficial effects:

[0017] In the direct current bus capacitor module of the utility model, each main bus capacitor unit is shunt connected with at least one slave bus capacitor unit, so that when a main bus capacitor unit is damaged, the damaged main bus capacitor unit is first closed or cut off, and then the corresponding slave bus capacitor unit is started to replace the damaged main bus capacitor unit, thereby ensuring the normal operation of the direct current bus capacitor module. BRIEF DESCRIPTION OF DRAWINGS

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit the utility model; the specification, claims and above description of the drawings of the utility model and the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. The specification and claims of the utility model or the above description of the drawings use the terms "first", "second" and the like to distinguish different objects, rather than to describe a specific order.

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor under the premise of the drawings.

[0020] Figure 1 The circuit schematic diagram of the existing DC bus capacitor module in the background art;

[0021] Figure 2 The module block diagram of the optical storage integrated machine system provided by the present application;

[0022] Figure 3 The first module block diagram of the DC bus capacitor module provided by the present application;

[0023] Figure 4 The first circuit schematic diagram of the DC bus capacitor module provided by the present application;

[0024] Figure 5 The second module block diagram of the DC bus capacitor module provided by the present application;

[0025] Figure 6 The second circuit schematic diagram of the DC bus capacitor module provided by the present application;

[0026] Figure 7 The third module block diagram of the DC bus capacitor module provided by the present application;

[0027] Figure 8 The third circuit schematic diagram of the DC bus capacitor module provided by the present application.

[0028] Reference signs:

[0029] 10, DC bus capacitor module;

[0030] 101, main bus capacitor unit; 1011, first main bus capacitor unit; 1012, second main bus capacitor unit; 1013, third main bus capacitor unit; 1014, fourth main bus capacitor unit; 1015, fifth main bus capacitor unit; 1016, sixth main bus capacitor unit; 1017, seventh main bus capacitor unit; 1018, eighth main bus capacitor unit;

[0031] 102, slave bus capacitor unit; 1021, first slave bus capacitor unit; 1022, second slave bus capacitor unit; 1023, third slave bus capacitor unit; 1024, fourth slave bus capacitor unit; 1025, fifth slave bus capacitor unit; 1026, sixth slave bus capacitor unit; 1027, seventh slave bus capacitor unit; 1028, eighth slave bus capacitor unit; 1029, ninth slave bus capacitor unit; 1030, tenth slave bus capacitor unit; 1031, eleventh slave bus capacitor unit; 1032, twelfth slave bus capacitor unit; 1033, thirteenth slave bus capacitor unit; 1034, fourteenth slave bus capacitor unit;

[0032] 20, photovoltaic cell module;

[0033] 30, energy storage battery module;

[0034] 40, AC power grid;

[0035] 50, slave control system;

[0036] 60, photovoltaic DC / DC module;

[0037] 70, energy storage DC / DC module;

[0038] 80, inverter module;

[0039] 90, master control system. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Therefore, the feature described in the specification is used to explain one feature of one embodiment of the present application, but it does not mean that each embodiment of the present application must have the described feature. In addition, it should be noted that the specification describes many features. Although some features can be combined together to show possible system designs, these features can also be used in other combinations that are not explicitly described. Therefore, unless otherwise stated, the described combination is not intended to limit.

[0041] The principles and structures of the present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0042] Embodiment 1

[0043] Referring to the accompanying drawings Figure 1The existing DC bus capacitor module contains six parallel bus capacitors, but the service life of the capacitor is relatively short in actual use due to the characteristics of the components of the capacitor. All bus capacitors in the previous DC bus capacitor module are directly connected in parallel to the DC bus of the photovoltaic and energy storage integrated system, which will directly affect the operation of the entire photovoltaic and energy storage integrated system if a bus capacitor is damaged and there is no replacement bus capacitor.

[0044] Therefore, to solve the above problems, with reference to the accompanying drawings Figures 2-3 The utility model provides a DC bus capacitor module 10, photovoltaic cell module 20, energy storage battery module 30 and AC power grid 40 are connected respectively to the DC bus capacitor module 10, the DC bus capacitor module 10 includes a plurality of parallel main bus capacitor units 101, and at least one slave bus capacitor unit 102 is connected in parallel to each main bus capacitor unit 101.

[0045] It should be noted that the DC bus capacitor module 10 in the embodiment is a main module in the photovoltaic and energy storage integrated system, which is connected to the photovoltaic cell module 20, the energy storage battery module 30 and the AC power grid 40, so the DC bus capacitor module 10 serves as a "highway" for power transmission within the photovoltaic and energy storage integrated system, ensuring smooth and efficient power exchange between modules. The bus capacitors in the DC bus capacitor module 10 help smooth current fluctuations and improve the stability and efficiency of the photovoltaic and energy storage integrated system.

[0046] Therefore, in the DC bus capacitor module 10, each main bus capacitor unit 101 is connected in parallel to at least one slave bus capacitor unit 102, so that when a main bus capacitor unit 101 is damaged, the damaged main bus capacitor unit 101 is first closed or removed, and then the corresponding slave bus capacitor unit 102 is started to replace the damaged main bus capacitor unit 101, thereby ensuring the normal operation of the DC bus capacitor module 10.

[0047] To ensure the normal operation of the DC bus capacitor module 10, with reference to the accompanying drawings Figure 3 The embodiment takes the DC bus capacitor module 10 including six parallel main bus capacitor units 101, and each main bus capacitor unit 101 is connected in parallel to one slave bus capacitor unit 102 as an example.

[0048] It should be noted that the DC bus capacitor module 10 in the embodiment needs six groups of bus capacitor units to normally operate. The DC bus capacitor module 10 of the embodiment is further connected with a slave control system 50, which can be connected with each of the main bus capacitor units 101 and each of the slave bus capacitor units 102 respectively, and the slave control system 50 is used for conducting or interrupting the corresponding switching device according to the abnormal condition of the bus capacitor.

[0049] Therefore, the utility model can detect whether the voltage of all bus capacitors in the main bus capacitor units 101 and the slave bus capacitor units 102 is within the voltage value range of the DC bus BUS through the slave control system 50, if yes, the corresponding bus capacitor is normal, and if no, the corresponding bus capacitor is abnormal.

[0050] In this way, under normal circumstances, the six main bus capacitor units 101 in the DC bus capacitor module 10 are normally started, so that the DC bus capacitor module 10 normally operates, and when at least one of the six main bus capacitor units 101 fails or is damaged, the slave control system 50 will close or cut off the main bus capacitor unit 101 that fails or is damaged, and then start the corresponding slave bus capacitor unit 102, so as to replace the damaged main bus capacitor unit 101, thereby ensuring the normal operation of the DC bus capacitor module 10.

[0051] Among them, referring to the attached Figure 3 Each of the main bus capacitor units 101 comprises a main bus capacitor and a first switching device arranged in series.

[0052] Each of the slave bus capacitor units 102 comprises a slave bus capacitor and a second switching device arranged in series.

[0053] In this way, the slave control system 50 first detects the voltage of each main bus capacitor in turn, and when detecting the voltage of one of the main bus capacitors, the corresponding first switching device needs to be closed and all the remaining first switching devices need to be opened, and then all the main bus capacitors are sequentially determined whether they are within the voltage range of the DC bus BUS. If the voltage of all the main bus capacitors is within the voltage range of the DC bus BUS, the slave control system 50 will correspondingly close the first switching device, so that the six main bus capacitor units 101 are normally powered and operated. If the voltage of at least one main bus capacitor is not within the voltage range of the DC bus BUS, the slave control system 50 will then detect the voltage of each slave bus capacitor in turn, and when detecting the voltage of one of the slave bus capacitors, the corresponding second switching device needs to be closed and all the remaining second switching devices need to be opened, and then all the slave bus capacitors are sequentially determined whether they are within the voltage range of the DC bus BUS. If so, the corresponding slave bus capacitor is normal, and the slave control system 50 will close the second switching device corresponding to the detected normal slave bus capacitor, so that the total number of the started main bus capacitor units 101 and slave bus capacitor units 102 in the DC bus capacitor module 10 is six, and then the DC bus capacitor module 10 is normally operated.

[0054] If the slave control system 50 detects that the total number of the main bus capacitors and the slave bus capacitors whose voltages are within the voltage range of the DC bus BUS is less than six, at this time the DC bus capacitor module 10 can operate less than six main bus capacitor units 101 and slave bus capacitor units 102, and at this time the light storage integrated machine system cannot operate, and the slave control system 50 will feedback the abnormal situation to the upper system, so as to inform the maintenance personnel to repair in time.

[0055] Specifically, referring to the accompanying drawings Figure 4 In this embodiment, the six parallel main bus capacitor units 101 include a first main bus capacitor unit 1011, a second main bus capacitor unit 1012, a third main bus capacitor unit 1013, a fourth main bus capacitor unit 1014, a fifth main bus capacitor unit 1015, and a sixth main bus capacitor unit 1016. Correspondingly, the slave bus capacitor unit 102 includes a first slave bus capacitor unit 1021, a second slave bus capacitor unit 1022, a third slave bus capacitor unit 1023, a fourth slave bus capacitor unit 1024, a fifth slave bus capacitor unit 1025, and a sixth slave bus capacitor unit 1026.

[0056] The first main bus capacitor unit 1011 includes a main bus capacitor C1 and a first switching device K1, the second main bus capacitor unit 1012 includes a main bus capacitor C2 and a first switching device K2, the third main bus capacitor unit 1013 includes a main bus capacitor C3 and a first switching device K3, the fourth main bus capacitor unit 1014 includes a main bus capacitor C4 and a first switching device K4, the fifth main bus capacitor unit 1015 includes a main bus capacitor C5 and a first switching device K5, and the sixth main bus capacitor unit 1016 includes a main bus capacitor C6 and a first switching device K6.

[0057] The first main bus capacitor unit 1011 includes a main bus capacitor C1 and a first switching device K1, the second main bus capacitor unit 1012 includes a main bus capacitor C2 and a first switching device K2, the third main bus capacitor unit 1013 includes a main bus capacitor C3 and a first switching device K3, the fourth main bus capacitor unit 1014 includes a main bus capacitor C4 and a first switching device K4, the fifth main bus capacitor unit 1015 includes a main bus capacitor C5 and a first switching device K5, and the sixth main bus capacitor unit 1016 includes a main bus capacitor C6 and a first switching device K6.

[0058] The first end of the first switching device K1, the first end of the first switching device K2, the first end of the first switching device K3, the first end of the first switching device K4, the first end of the first switching device K5, the first end of the first switching device K6, the first end of the first switching device K1', the first end of the first switching device K2', the first end of the first switching device K3', the first end of the first switching device K4', the first end of the first switching device K5', and the first end of the first switching device K6' are connected to the DC bus BUS+.

[0059] The second end of the first switching device K1 is connected to the first end of the main bus capacitor C1, the second end of the first switching device K2 is connected to the first end of the main bus capacitor C2, the second end of the first switching device K3 is connected to the first end of the main bus capacitor C3, the second end of the first switching device K4 is connected to the first end of the main bus capacitor C4, the second end of the first switching device K5 is connected to the first end of the main bus capacitor C5, the second end of the first switching device K6 is connected to the first end of the main bus capacitor C6, the second end of the first switching device K1' is connected to the first end of the slave bus capacitor C1', the second end of the first switching device K2' is connected to the first end of the slave bus capacitor C2', the second end of the first switching device K3' is connected to the first end of the slave bus capacitor C3', the second end of the first switching device K4' is connected to the first end of the slave bus capacitor C4', the second end of the first switching device K5' is connected to the first end of the slave bus capacitor C5', and the second end of the first switching device K6' is connected to the first end of the slave bus capacitor C6'.

[0060] The second end of the main bus capacitor C1, the second end of the main bus capacitor C2, the second end of the main bus capacitor C3, the second end of the main bus capacitor C4, the second end of the main bus capacitor C5, the second end of the main bus capacitor C6, the second end of the slave bus capacitor C1', the second end of the slave bus capacitor C2', the second end of the slave bus capacitor C3', the second end of the slave bus capacitor C4', the second end of the slave bus capacitor C5', and the second end of the slave bus capacitor C6' are connected with the DC bus BUS.

[0061] In this way, the slave system 50 first detects whether the voltage of the main bus capacitor C1-C6 is within the voltage range of the DC bus BUS, and if the voltage of the main bus capacitor C1-C6 is within the voltage range of the DC bus BUS, the slave system 50 will correspondingly close the first switching device K1-K6 to enable the six main bus capacitor units 101 to normally operate; if the voltage of at least one main bus capacitor is not within the voltage range of the DC bus BUS, the slave system 50 will further detect whether the voltage of the slave bus capacitor C1'-C6' is within the voltage range of the DC bus BUS, and if so, the corresponding slave bus capacitor is normal, the slave system 50 will first close the first switching device corresponding to the damaged main bus capacitor, and then close the second switching device corresponding to the detected normal slave bus capacitor, so that the total number of the started main bus capacitor units 101 and slave bus capacitor units 102 in the DC bus capacitor module 10 is six, thereby enabling the DC bus capacitor module 10 to normally operate.

[0062] The main bus capacitor is any one of an electrolytic capacitor, a film capacitor, a ceramic capacitor, and a double-layer capacitor. Of course, the main bus capacitor can also be other capacitors that meet the requirements of the bus capacitor, which are not limited herein.

[0063] It should be noted that the main bus capacitors C1-C6 in the embodiment are exemplified by film capacitors.

[0064] The first switching device is any one of a relay, a contactor, an IGBT, and a MOS tube. Of course, the first switching device can also be other switching devices that meet the requirements, which are not limited herein.

[0065] It should be noted that the first switching devices K1-K6 in the embodiment are exemplified by relays.

[0066] The slave bus capacitor is any one of an electrolytic capacitor, a film capacitor, a ceramic capacitor and a double-layer capacitor, so as to ensure smooth and efficient power exchange between the modules, smooth current fluctuation, improve the stability and efficiency of the photovoltaic energy storage integrated system, and ensure that the slave bus capacitor unit 102 can be turned on or off according to whether the main bus capacitor C1'-C6' is abnormal, so as to prevent affecting the operation of the photovoltaic energy storage integrated system.

[0067] It should be noted that the main bus capacitors C1'-C6' in the embodiment are exemplified by film capacitors.

[0068] The second switching device is any one of a relay, a contactor, an IGBT and a MOS tube, so as to ensure that the slave bus capacitor unit 102 can be turned on or off according to whether the main bus capacitor C1'-C6' is abnormal, so as to prevent affecting the operation of the photovoltaic energy storage integrated system.

[0069] It should be noted that the first switching devices K1'-K6' in the embodiment are exemplified by relays.

[0070] Embodiment 2

[0071] With reference to the accompanying drawings Figures 5-6 The utility model provides a kind of DC bus capacitor module 10, and the DC bus capacitor module 10 is connected photovoltaic cell module 20, energy storage battery module 30 and AC power grid 40 respectively;The DC bus capacitor module 10 includes six parallel main bus capacitor units 101, and each described main bus capacitor unit 101 It is parallelly connected with two slave bus capacitor units 102.

[0072] In this way, the utility model is parallelly connected with two slave bus capacitor units 102 in each main bus capacitor unit 101 in DC bus capacitor module 10, so when there is main bus capacitor unit 101 damage, it will be closed or cut off damaged main bus capacitor unit 101 first, then start any one of the corresponding two slave bus capacitor units 102 to replace damaged main bus capacitor unit 101, to further guarantee the normal operation of DC bus capacitor module 10.

[0073] Specifically, with reference to the accompanying drawings Figure 6The six parallel main bus capacitor units 101 in the embodiment include a first main bus capacitor unit 1011, a second main bus capacitor unit 1012, a third main bus capacitor unit 1013, a fourth main bus capacitor unit 1014, a fifth main bus capacitor unit 1015, and a sixth main bus capacitor unit 1016; correspondingly, the slave bus capacitor units 102 include a first slave bus capacitor unit 1021, a second slave bus capacitor unit 1022, a third slave bus capacitor unit 1023, a fourth slave bus capacitor unit 1024, a fifth slave bus capacitor unit 1025, a sixth slave bus capacitor unit 1026, a seventh slave bus capacitor unit 1027, an eighth slave bus capacitor unit 1028, a ninth slave bus capacitor unit 1029, a tenth slave bus capacitor unit 1030, an eleventh slave bus capacitor unit 1031, and a twelfth slave bus capacitor unit 1032.

[0074] The first main bus capacitor unit 1011 includes a main bus capacitor C1 and a first switching device K1, the second main bus capacitor unit 1012 includes a main bus capacitor C2 and a first switching device K2, the third main bus capacitor unit 1013 includes a main bus capacitor C3 and a first switching device K3, the fourth main bus capacitor unit 1014 includes a main bus capacitor C4 and a first switching device K4, the fifth main bus capacitor unit 1015 includes a main bus capacitor C5 and a first switching device K5, and the sixth main bus capacitor unit 1016 includes a main bus capacitor C6 and a first switching device K6.

[0075] The first slave bus capacitor unit 1021 includes a slave bus capacitor C1' and a first switching device K1', the second slave bus capacitor unit 1022 includes a slave bus capacitor C2' and a first switching device K2', the third slave bus capacitor unit 1023 includes a slave bus capacitor C3' and a first switching device K3', the fourth slave bus capacitor unit 1024 includes a slave bus capacitor C4' and a first switching device K4', the fifth slave bus capacitor unit 1025 includes a slave bus capacitor C5' and a first switching device K5', the sixth slave bus capacitor unit 1026 includes a slave bus capacitor C6' and a first switching device K6', the seventh slave bus capacitor unit 1027 includes a slave bus capacitor C1" and a first switching device K1", the eighth slave bus capacitor unit 1028 includes a slave bus capacitor C2" and a first switching device K2", the ninth slave bus capacitor unit 1029 includes a slave bus capacitor C3" and a first switching device K3", the tenth slave bus capacitor unit 1030 includes a slave bus capacitor C4" and a first switching device K4", the eleventh slave bus capacitor unit 1031 includes a slave bus capacitor C5" and a first switching device K5", and the twelfth slave bus capacitor unit 1032 includes a slave bus capacitor C6" and a first switching device K6".

[0076] The first end of the first switching device K1, the first end of the first switching device K2, the first end of the first switching device K3, the first end of the first switching device K4, the first end of the first switching device K5, the first end of the first switching device K6, the first end of the first switching device K1', the first end of the first switching device K1'', the first end of the first switching device K2', the first end of the first switching device K2'', the first end of the first switching device K3', the first end of the first switching device K3'', the first end of the first switching device K4', the first end of the first switching device K4'', the first end of the first switching device K5', the first end of the first switching device K5'', the first end of the first switching device K6', and the first end of the first switching device K6'' are connected with the DC bus BUS+.

[0077] The second end of the first switching device K1 is connected with the first end of the main bus capacitor C1, the second end of the first switching device K2 is connected with the first end of the main bus capacitor C2, the second end of the first switching device K3 is connected with the first end of the main bus capacitor C3, the second end of the first switching device K4 is connected with the first end of the main bus capacitor C4, the second end of the first switching device K5 is connected with the first end of the main bus capacitor C5, the second end of the first switching device K6 is connected with the first end of the main bus capacitor C6, the second end of the first switching device K1' is connected with the first end of the slave bus capacitor C1', the second end of the first switching device K1'' is connected with the first end of the slave bus capacitor C1'', the second end of the first switching device K2' is connected with the first end of the slave bus capacitor C2', the second end of the first switching device K2'' is connected with the first end of the slave bus capacitor C2'', the second end of the first switching device K3' is connected with the first end of the slave bus capacitor C3', the second end of the first switching device K3'' is connected with the first end of the slave bus capacitor C3'', the second end of the first switching device K4' is connected with the first end of the slave bus capacitor C4', the second end of the first switching device K4'' is connected with the first end of the slave bus capacitor C4'', the second end of the first switching device K5' is connected with the first end of the slave bus capacitor C5', the second end of the first switching device K5'' is connected with the first end of the slave bus capacitor C5'', the second end of the first switching device K6' is connected with the first end of the slave bus capacitor C6', and the second end of the first switching device K6'' is connected with the first end of the slave bus capacitor C6''.

[0078] The second end of the main bus capacitor C1, the second end of the main bus capacitor C2, the second end of the main bus capacitor C3, the second end of the main bus capacitor C4, the second end of the main bus capacitor C5, the second end of the main bus capacitor C6, the second end of the slave bus capacitor C1', the second end of the slave bus capacitor C1'', the second end of the slave bus capacitor C2', the second end of the slave bus capacitor C2'', the second end of the slave bus capacitor C3', the second end of the slave bus capacitor C3'', the second end of the slave bus capacitor C4', the second end of the slave bus capacitor C4'', the second end of the slave bus capacitor C5', the second end of the slave bus capacitor C5'', the second end of the slave bus capacitor C6' and the second end of the slave bus capacitor C6'' are all connected with the DC bus BUS-.

[0079] In this way, the slave system 50 first detects whether the voltages of the main bus capacitors C1-C6 are within the voltage range of the DC bus BUS. If the voltages of the main bus capacitors C1-C6 are all within the voltage range of the DC bus BUS, the slave system 50 will correspondingly close the first switching devices K1-K6, so that the six main bus capacitor units 101 are normally powered and operated. If the voltage of at least one main bus capacitor is not within the voltage range of the DC bus BUS, the slave system 50 will further detect whether the voltages of the slave bus capacitors C1'-C6' and C1''-C6'' are within the voltage range of the DC bus BUS. If yes, the corresponding slave bus capacitors are normal. The slave system 50 will first close the second switching device corresponding to the normal slave bus capacitor, and then close the first switching device corresponding to the damaged main bus capacitor, so that the total number of the started main bus capacitor units 101 and slave bus capacitor units 102 in the DC bus capacitor module 10 is six, and the DC bus capacitor module 10 is normally operated.

[0080] If the slave system 50 detects that the total number of the main bus capacitors C1-C6, the slave bus capacitors C1'-C6' and the slave bus capacitors C1''-C6'' whose voltages are within the voltage range of the DC bus BUS is less than six, the number of the main bus capacitor units 101 and the slave bus capacitor units 102 that can be operated in the DC bus capacitor module 10 at this time is also less than six, and the optical storage integrated machine system cannot be operated at this time. The slave system 50 will feedback the abnormal situation to the upper system, so as to inform the maintenance personnel to maintain in time.

[0081] Embodiment 3

[0082] Referring to the drawings Figures 7-8The utility model provides a kind of DC bus capacitor module 10, the DC bus capacitor module 10 is connected photovoltaic cell module 20, energy storage battery module 30 and AC power grid 40 respectively;The DC bus capacitor module 10 includes eight parallel main bus capacitor units 101, and each described main bus capacitor unit 101 It is parallel with one slave bus capacitor unit 102.

[0083] In this way, the utility model in each main bus capacitor unit 101 of DC bus capacitor module 10 It is parallel with one slave bus capacitor unit 102, so when there is main bus capacitor unit 101 damage, it will be closed or cut off damaged main bus capacitor unit 101 first, then start corresponding slave bus capacitor unit 102 to replace damaged main bus capacitor unit 101, to ensure the normal operation of DC bus capacitor module 10.

[0084] Specifically, refer to the attached Figure 8 Eight parallel main bus capacitor units 101 in the embodiment include first main bus capacitor unit 1011, second main bus capacitor unit 1012, third main bus capacitor unit 1013, fourth main bus capacitor unit 1014, fifth main bus capacitor unit 1015, sixth main bus capacitor unit 1016, seventh main bus capacitor unit 1017 and eighth main bus capacitor unit 1018;Correspondingly, slave bus capacitor unit 102 includes first slave bus capacitor unit 1021, second slave bus capacitor unit 1022, third slave bus capacitor unit 1023, fourth slave bus capacitor unit 1024, fifth slave bus capacitor unit 1025, sixth slave bus capacitor unit 1026, thirteenth slave bus capacitor unit 1033, fourteenth slave bus capacitor unit 1034.

[0085] First main bus capacitor unit 1011 includes main bus capacitor C1 and first switching device K1, second main bus capacitor unit 1012 includes main bus capacitor C2 and first switching device K2, third main bus capacitor unit 1013 includes main bus capacitor C3 and first switching device K3, fourth main bus capacitor unit 1014 includes main bus capacitor C4 and first switching device K4, fifth main bus capacitor unit 1015 includes main bus capacitor C5 and first switching device K5, sixth main bus capacitor unit 1016 includes main bus capacitor C6 and first switching device K6, seventh main bus capacitor unit 1017 includes main bus capacitor C7 and first switching device K7, eighth main bus capacitor unit 1018 includes main bus capacitor C8 and first switching device K8.

[0086] The first slave bus capacitor unit 1021 includes a slave bus capacitor C1' and a first switching device K1', the second slave bus capacitor unit 1022 includes a slave bus capacitor C2' and a first switching device K2', the third slave bus capacitor unit 1023 includes a slave bus capacitor C3' and a first switching device K3', the fourth slave bus capacitor unit 1024 includes a slave bus capacitor C4' and a first switching device K4', the fifth slave bus capacitor unit 1025 includes a slave bus capacitor C5' and a first switching device K5', the sixth slave bus capacitor unit 1026 includes a slave bus capacitor C6' and a first switching device K6', the thirteenth slave bus capacitor unit 1033 includes a slave bus capacitor C7' and a first switching device K7', and the fourteenth slave bus capacitor unit 1034 includes a slave bus capacitor C8' and a first switching device K8'.

[0087] The first end of the first switching device K1, the first end of the first switching device K2, the first end of the first switching device K3, the first end of the first switching device K4, the first end of the first switching device K5, the first end of the first switching device K6, the first end of the first switching device K7, the first end of the first switching device K8, the first end of the first switching device K1', the first end of the first switching device K2', the first end of the first switching device K3', the first end of the first switching device K4', the first end of the first switching device K5', the first end of the first switching device K6', the first end of the first switching device K7', and the first end of the first switching device K8' are connected to the DC bus BUS+.

[0088] The second end of the first switching device K1 is connected with the first end of the main bus capacitor C1, the second end of the first switching device K2 is connected with the first end of the main bus capacitor C2, the second end of the first switching device K3 is connected with the first end of the main bus capacitor C3, the second end of the first switching device K4 is connected with the first end of the main bus capacitor C4, the second end of the first switching device K5 is connected with the first end of the main bus capacitor C5, the second end of the first switching device K6 is connected with the first end of the main bus capacitor C6, the second end of the first switching device K7 is connected with the first end of the main bus capacitor C7, the second end of the first switching device K8 is connected with the first end of the main bus capacitor C8, the second end of the first switching device K1' is connected with the first end of the slave bus capacitor C1', the second end of the first switching device K2' is connected with the first end of the slave bus capacitor C2', the second end of the first switching device K3' is connected with the first end of the slave bus capacitor C3', the second end of the first switching device K4' is connected with the first end of the slave bus capacitor C4', the second end of the first switching device K5' is connected with the first end of the slave bus capacitor C5', the second end of the first switching device K6' is connected with the first end of the slave bus capacitor C6', the second end of the first switching device K7' is connected with the first end of the slave bus capacitor C7', and the second end of the first switching device K8' is connected with the first end of the slave bus capacitor C8'.

[0089] The second end of the main bus capacitor C1, the second end of the main bus capacitor C2, the second end of the main bus capacitor C3, the second end of the main bus capacitor C4, the second end of the main bus capacitor C5, the second end of the main bus capacitor C6, the second end of the main bus capacitor C7, the second end of the main bus capacitor C8, the second end of the slave bus capacitor C1', the second end of the slave bus capacitor C2', the second end of the slave bus capacitor C3', the second end of the slave bus capacitor C4', the second end of the slave bus capacitor C5', the second end of the slave bus capacitor C6', the second end of the slave bus capacitor C7', and the second end of the slave bus capacitor C8' are all connected with the DC bus BUS-.

[0090] Thus, the slave control system 50 first detects whether the voltage of the main bus capacitor C1-C8 is in the voltage value range of the DC bus BUS, and if the voltage of the six main bus capacitors is in the voltage value range of the DC bus BUS, the slave control system 50 will correspondingly close the first switch device K1-K6 to enable the corresponding six main bus capacitor units 101 to normally operate; if the voltage of at least three main bus capacitors is not in the voltage value range of the DC bus BUS, the slave control system 50 will further detect whether the voltage of the slave bus capacitor C1'-C8 is in the voltage value range of the DC bus BUS, if so, the corresponding slave bus capacitor is normal, the slave control system 50 will first close the first switch device corresponding to the damaged main bus capacitor, and then close the second switch device corresponding to the detected normal slave bus capacitor, so that the total number of the started main bus capacitor units 101 and slave bus capacitor units 102 in the DC bus capacitor module 10 is six, thereby enabling the DC bus capacitor module 10 to normally operate.

[0091] If the slave control system 50 detects that the total number of the voltage of the main bus capacitor C1-C8 and the slave bus capacitor C1'-C8' in the voltage value range of the DC bus BUS is less than six, at this time, the DC bus capacitor module 10 can operate less than six main bus capacitor units 101 and slave bus capacitor units 102, at this time, the light storage integrated machine system cannot operate, and the slave control system 50 will feedback the abnormal situation to the upper system to inform the maintenance personnel to maintain in time.

[0092] Embodiment 4

[0093] Referring to the accompanying drawings Figure 2 The utility model also proposes a light storage integrated machine system, the DC bus BUS of light storage integrated machine system is parallelly connected with above-mentioned DC bus capacitor module 10.

[0094] It should be noted that the embodiment takes the DC bus capacitor module 10 including six parallel main bus capacitor units 101 as an example, and each main bus capacitor unit 101 is parallelly connected with a slave bus capacitor unit 102.

[0095] Thus, the utility model discloses that each main bus capacitor unit 101 in DC bus capacitor module 10 is parallelly connected with a slave bus capacitor unit 102, when the main bus capacitor unit 101 is damaged, the damaged main bus capacitor unit is first closed or cut off, and then the corresponding slave bus capacitor unit 102 is started to replace the damaged main bus capacitor unit 101, thereby ensuring the normal operation of the DC bus capacitor module 10.

[0096] The light storage integrated machine system further comprises a slave control system 50 connected with the DC bus capacitor module 10, and the slave control system 50 is configured to control the on-off of the corresponding switching device according to the abnormal condition of the bus capacitor.

[0097] In this way, the slave control system 50 first detects whether the voltage of the main bus capacitor is within the voltage range of the DC bus BUS in real time. If the voltage of all the main bus capacitors is within the voltage range of the DC bus BUS, the slave control system 50 will correspondingly close the first switching device, so that the six main bus capacitor units 101 are normally powered on. If the voltage of at least one main bus capacitor is not within the voltage range of the DC bus BUS, the slave control system 50 will further detect whether the voltage of the slave bus capacitor is within the voltage range of the DC bus BUS in real time. If so, the corresponding slave bus capacitor is normal, the slave control system 50 will first close the first switching device corresponding to the damaged main bus capacitor, and then close the second switching device corresponding to the detected normal slave bus capacitor, so that the total number of the started main bus capacitor units 101 and slave bus capacitor units 102 in the DC bus capacitor module 10 is six, thereby enabling the DC bus capacitor module 10 to operate normally.

[0098] If the slave control system 50 detects that the total number of the main bus capacitors and the slave bus capacitors whose voltages are within the voltage range of the DC bus BUS is less than six, the number of the main bus capacitor units 101 and the slave bus capacitor units 102 that can operate in the DC bus capacitor module 10 at this time is also less than six, and the light storage integrated machine system cannot operate at this time. The slave control system 50 will feedback the abnormal condition to the upper system, so as to inform the maintenance personnel to repair in time.

[0099] The light storage integrated machine system further comprises a photovoltaic cell module 20, an energy storage battery module 30, a photovoltaic DC / DC module 60, an energy storage DC / DC module 70, and an inverter module 80.

[0100] The photovoltaic cell module 20 is configured to convert solar energy into electrical energy; the energy storage battery module 30 is configured to store excess electrical energy for future use; the photovoltaic DC / DC module 60 is configured to convert unstable DC power (voltage and current will change with light intensity) generated by the photovoltaic cell module 20 into a stable and suitable form for further processing, such as increasing the voltage level, so as to more effectively transmit or store electrical energy; the energy storage DC / DC module 70 is configured to regulate the voltage across the energy storage battery module 30 to prevent overcharging or over-discharging, and protect the service life of the energy storage battery module 30; and the inverter module 80 is configured to convert the DC power of the photovoltaic cell module 20 or the energy storage battery module 30 into AC power, or convert the AC power output by the AC power grid 40 into DC power suitable for the energy storage battery module 30 or other electrical equipment.

[0101] The photovoltaic cell module 20 is connected with the direct current bus BUS through the photovoltaic DC / DC module 60, the energy storage battery module 30 is connected with the direct current bus BUS through the energy storage DC / DC module 70, the alternating current power grid 40 is connected with the direct current bus BUS through the inverter module 80, and the direct current bus BUS is parallelly connected with the direct current bus capacitor module 10.

[0102] The photovoltaic storage integrated system further comprises a master control system 90 connected with the slave control system 50, and the master control system 90 is configured to receive instructions from an upper computer and transmit the instructions to the slave control system 50, so that the slave control system 50 is configured to control the on-off of the corresponding switch device according to the abnormal condition of each master bus capacitor and each slave bus capacitor.

[0103] It should be noted that the direct current bus capacitor module 10 provided in the embodiment can be used not only in the photovoltaic storage integrated system, but also in photovoltaic inverters, energy storage PCS (Power Conversion System) and other devices with direct current bus capacitors, and is not limited herein.

[0104] Obviously, the above-described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A DC bus capacitor module, the DC bus capacitor module is connected with a photovoltaic cell module, an energy storage battery module and an AC power grid respectively; characterized in that, The DC bus capacitor module comprises a plurality of main bus capacitor units connected in parallel, and each main bus capacitor unit is connected in parallel with at least one slave bus capacitor unit.

2. The DC bus capacitor module of claim 1, wherein, Each main bus capacitor unit comprises a main bus capacitor and a first switching device connected in series.

3. The DC bus capacitor module of claim 2, wherein, Each slave bus capacitor unit comprises a slave bus capacitor and a second switching device connected in series.

4. The DC bus capacitor module of claim 3, wherein, The DC bus capacitor module further comprises a slave control system, which can be connected to each main bus capacitor unit and each slave bus capacitor unit respectively, and the slave control system is used to control the on-off of the corresponding switching device according to the abnormal condition of the bus capacitor.

5. The DC bus capacitor module of claim 2, wherein, The main bus capacitor is any one of electrolytic capacitor, film capacitor, ceramic capacitor and double-layer capacitor.

6. The DC bus capacitor module of claim 2, wherein, The first switching device is any one of relay, contactor, IGBT and MOS tube.

7. The DC bus capacitor module of claim 3, wherein, The slave bus capacitor is any one of electrolytic capacitor, film capacitor, ceramic capacitor and double-layer capacitor.

8. The DC bus capacitor module of claim 3, wherein, The second switching device is any one of relay, contactor, IGBT and MOS tube.

9. A light storage integrated system, characterized by, The DC bus of the light storage integrated machine system is connected in parallel with the DC bus capacitor module of any one of claims 1-8. 10.The optical storage integrated system of claim 9, wherein, The light storage integrated machine system further comprises a photovoltaic cell module, an energy storage battery module, a photovoltaic DC / DC module, an energy storage DC / DC module and an inverter module. The photovoltaic cell module is connected to the DC bus through the photovoltaic DC / DC module, the energy storage battery module is connected to the DC bus through the energy storage DC / DC module, and the AC power grid is connected to the DC bus through the inverter module.

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