Power grid frequency modulation circuit based on super capacitor

Abstract

The utility model relates to a power grid frequency modulation circuit based on super capacitors, and a capacitor module group is composed of a plurality of super capacitors, so as to improve the capacitance and voltage. The voltage detection unit is used for detecting the voltage of the plurality of capacitor modules; the charging unit is used for charging the capacitor module by selecting one of a first charging mode, a second charging mode and a third charging mode according to the voltage of the capacitor module; the frequency detection unit detects the frequency of the power grid; the energy storage converter performs constant frequency on the power grid and is controlled by the frequency modulation unit; the frequency modulation unit controls the working state of the energy storage converter according to the frequency of the power grid to adjust the frequency of the power grid to be constant; therefore, different charging modes are used for charging and energy storage of the capacitor module for frequency modulation use of a power grid, the defect that the capacitor module cannot be directly charged and recovered through existing equipment when the capacitor module is not used for a long time and the voltage is reduced is overcome, the cost is low, the size is small, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the power grid frequency modulation technical field more specifically, relate to a kind of power grid frequency modulation circuit based on super capacitor. BACKGROUND

[0002] With the development and progress of science and technology, new energy research and development is imperative;At present, in the installation of new energy storage device, lithium ion battery energy storage accounts for more than 90%, in energy type frequency modulation energy storage application, lithium battery is frequently subjected to high-rate shallow charge and discharge, which can reduce the service life of lithium battery. Therefore, super capacitor energy storage is needed to make up for the deficiency of lithium battery energy storage.

[0003] Super capacitor belongs to power type energy storage, with high power density, fast response speed, long cycle life, good safety performance, wide temperature range and other advantages, and good effect in smoothing instantaneous power fluctuation. However, the low voltage range of the current super capacitor energy storage system is low, which leads to the requirement of wide voltage range of the charge and discharge equipment, and the cost of large super capacitor energy storage system is high. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem, in view of the above defects of prior art, provide a kind of cost, small based on super capacitor's power grid frequency modulation circuit.

[0005] The utility model solves the technical problem and adopts the technical scheme that:

[0006] A kind of power grid frequency modulation circuit based on super capacitor is constructed, including multiple capacitor modules and one or more charging units and energy storage converter;Wherein, the energy storage converter is connected between power grid and one or more charging units, and multiple capacitor modules are connected with the charging unit in series;

[0007] Multiple capacitor modules are also connected with voltage detection unit, and the voltage detection unit is connected with the charging unit;

[0008] The power grid is connected with frequency detection unit, and the frequency detection unit is connected with frequency modulation unit, and the frequency modulation unit is connected with the energy storage converter;

[0009] Capacitor module is composed of multiple super capacitors;

[0010] Voltage detection unit detects the voltage of multiple capacitor modules;

[0011] Charging unit selects one of first charging mode, second charging mode and third charging mode according to the voltage of capacitor module to charge capacitor module;

[0012] Frequency detection unit detects the frequency of power grid.

[0013] The energy storage converter is controlled by the frequency regulating unit to keep the frequency of the power grid constant.

[0014] The frequency regulating unit controls the working state of the energy storage converter according to the frequency of the power grid to regulate the frequency of the power grid to keep constant.

[0015] The working state of the energy storage converter includes a charging state and an inverting state; the charging state includes converting AC power of the power grid into DC power through voltage reduction and rectification to charge the capacitor module; and the inverting state includes converting DC power of the capacitor module into AC power through inversion and voltage increase to supply power to the power grid.

[0016] The power grid frequency regulating circuit based on the super capacitor further comprises a power-off unit connected in series between the energy storage converter and the charging unit.

[0017] The power-off unit disconnects a plurality of the capacitor modules from the power grid according to the voltage of the plurality of the capacitor modules, and the power-off unit is connected with the voltage detection unit connected with the plurality of the capacitor modules.

[0018] The power grid frequency regulating circuit based on the super capacitor further comprises a first charging unit, a second charging unit and a third charging unit.

[0019] The first charging unit comprises a charging resistor connected in series between the energy storage converter and the capacitor module, the second charging unit comprises a charging module connected with the capacitor module to charge the capacitor module, and the third charging unit comprises a normally open contact of a first contactor connected in series between the energy storage converter and the capacitor module.

[0020] The first charging mode uses the first charging unit to charge the capacitor module, the second charging mode uses the second charging unit to charge the capacitor module, and the third charging mode uses the third charging unit to charge the capacitor module.

[0021] The power grid frequency regulating circuit based on the super capacitor further comprises a charging module that takes power from any one of the power grid, the energy storage converter and three-phase AC power.

[0022] The power-off unit further comprises a plurality of normally open contacts of a second contactor.

[0023] The power grid frequency regulating circuit based on the super capacitor further comprises a capacitor stack.

[0024] The capacitor stack comprises the power-off unit, the charging unit and the capacitor cluster, and the voltage detection unit.

[0025] The capacitor cluster comprises a plurality of the capacitor modules connected in series.

[0026] The second charging unit comprises a charging module and a third contactor.

[0027] The coil of the first contactor is interlocked with the coil of the third contactor.

[0028] The plurality of normally open contacts of the third contactor control the power input of the charging module.

[0029] The first charging unit further comprises a fourth contactor.

[0030] The normally open contact of the fourth contactor is connected in series with the charging resistor and then connected in series between the energy storage converter and the capacitor module.

[0031] The first charging mode, the second charging mode and the third charging mode are all constant-voltage and constant-current charging modes for the capacitor module.

[0032] The charging unit selects one of a plurality of charging modes according to the voltage of the capacitor module to charge the plurality of capacitor modules.

[0033] The plurality of charging modes at least comprise the first charging mode, the second charging mode and the third charging mode.

[0034] The capacitor module is composed of a plurality of super capacitors to improve the capacitance and voltage; the voltage detection unit detects the voltage of the plurality of capacitor modules; the charging unit selects one of the first charging mode, the second charging mode and the third charging mode according to the voltage of the capacitor module to charge the capacitor module; the frequency detection unit detects the frequency of the power grid; the energy storage converter controls the frequency of the power grid and is controlled by the frequency control unit; the frequency control unit controls the working state of the energy storage converter to adjust the frequency of the power grid.

[0035] The working state of the energy storage converter includes: a charging state and an inverting state; the charging state includes: reducing and rectifying the alternating current of the power grid into direct current to deliver to the capacitor module for charging; the inverting state includes: inverting and boosting the direct current of the capacitor module into alternating current to deliver to the power grid for power supply; further, the energy storage converter performs constant frequency on the power grid by switching the charging state or the inverting state;

[0036] For example: when the frequency of the power grid is low, the direct current of the capacitor module is inverted and boosted into alternating current to deliver to the power grid for power supply, and vice versa, the alternating current of the power grid is reduced and rectified into direct current to deliver to the capacitor module for charging, so as to realize constant frequency to compensate for the insufficient or excessive power generation of the power plant, and to compensate for the insufficient or excessive power generation of the power plant.

[0037] Thus, different charging modes are used to charge the capacitor module for energy storage for frequency modulation of the power grid, which compensates for the insufficient voltage of the capacitor module for a long time, and the capacitor module cannot be directly charged and recovered by using existing equipment, and the cost is low, the size is small, and the user experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is an implementation flowchart of the power grid frequency modulation method based on the super capacitor provided by the embodiment one of the utility model;

[0039] Figure 2 is a structure schematic view of the power grid frequency modulation system based on the super capacitor provided by the embodiment two of the utility model;

[0040] Figure 3 is a structure schematic view of the first charging unit, the second charging unit and the third charging unit of the power grid frequency modulation system based on the super capacitor provided by the embodiment two of the utility model;

[0041] Figure 4 is a circuit block diagram of the power grid frequency modulation circuit based on the super capacitor provided by the embodiment three of the utility model;

[0042] Figure 5 is a circuit principle diagram of the first charging unit and the third charging unit of the power grid frequency modulation circuit based on the super capacitor provided by the embodiment three of the utility model;

[0043] Figure 6 is a circuit principle diagram of the second charging module of the power grid frequency modulation circuit based on the super capacitor provided by the embodiment three of the utility model. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0045] The specific implementation of the utility model will be described in detail below in combination with specific examples:

[0046] Example One

[0047] Figure 1 The implementation process of the power grid frequency modulation method based on the super capacitor provided by the embodiment of the utility model is shown, for the convenience of illustration, only the part related to the embodiment of the utility model is shown, and the details are as follows:

[0048] In step S101, the voltage of one or more capacitor modules is detected;

[0049] In the embodiment of the utility model, the voltage of the capacitor module is detected to intelligently charge the capacitor module, for example: different charging modes are selected according to the voltage of the capacitor module to charge.

[0050] In step S102, one or more capacitor modules are charged according to the voltage of the capacitor module selected from a plurality of charging modes;

[0051] In the embodiment of the utility model, the charging mode limits the charging voltage or charging current of the capacitor module;

[0052] Preferably, the plurality of charging modes at least includes: a first charging mode, a second charging mode and a third charging mode;

[0053] The first charging mode is used to charge the capacitor module when the voltage of the capacitor module is in the first voltage range, the second charging mode is used to charge the capacitor module when the voltage of the capacitor module is in the second voltage range, and the third charging mode is used to charge the capacitor module when the voltage of the capacitor module is in the third voltage range;

[0054] Wherein, the charging voltage of the first charging mode is less than the charging voltage of the second charging mode, and the charging voltage of the second charging mode is less than the charging voltage of the third charging mode; three voltages are used to charge the capacitor module to fill the capacitor module from 0V to the normal working voltage, and to make up for the deficiency that the capacitor module voltage is too low and the energy storage converter cannot charge it.

[0055] Further, the first charging mode, the second charging mode and the third charging mode all perform constant current charging on the capacitor module; to protect the capacitor module.

[0056] In step S103, the frequency of the power grid is detected;

[0057] In the embodiment of the utility model, the frequency of the power grid is detected to rectify the alternating current of the power grid into direct current to charge the capacitor module in real time according to the frequency of the power grid, or to convert the direct current of the capacitor module into alternating current to supply power to the power grid, so as to realize constant frequency of the power grid.

[0058] In step S104, the power grid is supplied with constant frequency;

[0059] In the embodiment of the utility model, the constant frequency of the power grid includes: rectifying the alternating current of the power grid into direct current to charge the capacitor module, or converting the direct current of the capacitor module into alternating current to supply power to the power grid according to the frequency of the power grid.

[0060] Further, the method further includes: disconnecting the corresponding multiple capacitor modules from supplying power to the power grid according to the voltage of the multiple capacitor modules; for example, when the voltage of the capacitor module is too low, the capacitor module is disconnected from supplying power to the power grid, and other capacitor modules with higher voltage are preferentially used to supply power to the power grid, so as to avoid the capacitor module being depleted and requiring a long time to charge and recover.

[0061] In the embodiment of the utility model, the voltage of one or more capacitor modules is detected; one or more capacitor modules are charged by selecting one of multiple charging modes according to the voltage of the capacitor module; the frequency of the power grid is detected; the power grid is supplied with constant frequency; wherein the power grid is supplied with constant frequency, including: rectifying the alternating current of the power grid into direct current to charge the capacitor module, or converting the direct current of the capacitor module into alternating current to supply power to the power grid according to the frequency of the power grid, for example, when the frequency of the power grid is low, the direct current of the capacitor module is converted into alternating current to supply power to the power grid, and vice versa, when the frequency of the power grid is high, the alternating current of the power grid is rectified into direct current to charge the capacitor module, so as to realize constant frequency to compensate for the insufficient or excessive power generation of the power plant, and to compensate for the insufficient or excessive frequency of the power grid; further, the charging mode limits the charging voltage or charging current of the capacitor module; so as to realize charging and energy storage of the capacitor module by using different charging modes to prepare for frequency modulation of the power grid, to compensate for the insufficient charging and recovery of the capacitor module with reduced voltage through existing equipment when the capacitor module is not used for a long time, and to improve user experience.

[0062] Example Two

[0063] Figure 2 And Figure 3 The structure of the power grid frequency modulation system based on the super capacitor according to the embodiment of the utility model is shown, only the parts related to the embodiment of the utility model are shown for convenience of description, which includes:

[0064] one or more capacitor modules 210, composed of a plurality of supercapacitors; wherein the capacitor module 210 is composed of a plurality of supercapacitors in series, parallel or series-parallel connection;

[0065] one or more voltage detection units 220, detecting the voltage of the one or more capacitor modules 210;

[0066] one or more charging units 230, charging the one or more capacitor modules 210 according to the voltage of the capacitor module 210 by selecting one of a plurality of charging modes; the charging mode limits the charging voltage or charging current of the capacitor module 210;

[0067] a frequency detection unit 240, detecting the frequency of the power grid 200; wherein the power grid is an alternating current power grid and the voltage is 35KV or 690V;

[0068] a storage converter 250, performing constant frequency on the power grid 200, controlled by a frequency adjustment unit 260; further, the storage converter 250 performs constant frequency on the power grid 200 by switching between charging state and inverter state.

[0069] a frequency adjustment unit 260, adjusting the frequency of the power grid 200 by controlling the working state of the storage converter 250 to adjust the frequency of the power grid 200; for example: when the frequency of the power grid 200 is low, the storage converter 250 is controlled to use inverter mode, otherwise the charging mode is used.

[0070] the working state of the storage converter 250 includes: charging state and inverter state; the charging state includes: converting the alternating current of the power grid 200 into direct current by step-down rectification and delivering it to the capacitor module 210 for charging; the inverter state includes: converting the direct current of the capacitor module 210 into alternating current by inverter and delivering it to the power grid 200 for power supply.

[0071] Preferably, the plurality of charging modes at least includes: first charging mode, second charging mode and third charging mode;

[0072] when the voltage of the capacitor module 210 is in the first voltage range, the first charging mode is used to charge the capacitor module 210; when the voltage of the capacitor module 210 is in the second voltage range, the second charging mode is used to charge the capacitor module 210; when the voltage of the capacitor module 210 is in the third voltage range, the third charging mode is used to charge the capacitor module 210;

[0073] wherein the charging voltage of the first charging mode is less than the charging voltage of the second charging mode, and the charging voltage of the second charging mode is less than the charging voltage of the third charging mode.

[0074] Further, the charging unit 230 further comprises: a first charging unit 231 and a second charging unit 232 and a third charging unit 233;

[0075] The first charging unit 231 comprises: a charging resistor connected in series between the energy storage converter 250 and the capacitor module 210 to achieve current limiting and voltage dividing, and the cost is low, and the charging resistor preferably uses a charging resistor with 200R / 200W; the second charging unit 232 comprises: a charging module (not shown in the figure) connected with the capacitor module 210 to charge the capacitor module 210, which has higher charging efficiency than using a series charging resistor to charge the capacitor module 210; the third charging unit 233 comprises: a normally open contact of a first contactor connected in series between the energy storage converter 250 and the capacitor module 210, that is, the capacitor module 210 is directly charged by the energy storage converter 250, which has higher charging efficiency than using a charging module to charge the capacitor module 210; for example: the series charging resistor is suitable for use when the voltage of the capacitor module 210 is 0V-150V, the charging module is used when the voltage of the capacitor module 210 is 150V-1000V, and the energy storage converter 250 is used when the voltage of the capacitor module 210 is higher than 1000V.

[0076] The charging module takes power from any one of the power grid 200, the energy storage converter 250, and three-phase alternating current mains, to meet the working requirements of different charging modules;

[0077] The first charging mode uses the first charging unit 231 to charge the capacitor module 210, the second charging mode uses the second charging unit 232 to charge the capacitor module 210, and the third charging mode uses the third charging unit 233 to charge the capacitor module 210.

[0078] Further, the system further comprises:

[0079] The one or more power-off units 270 disconnect the corresponding plurality of capacitor modules 210 from supplying power to the power grid 200 according to the voltage of the plurality of capacitor modules 210, to realize secondary disconnection protection of the capacitor module from the power grid 200 and improve stability.

[0080] Preferably, the third charging unit 233 is further used to disconnect one or more capacitor modules 210 from supplying power to the power grid 200, to realize primary disconnection of the capacitor module from the power grid 200, and the current flows bidirectionally in the third charging unit 233;

[0081] The system further comprises: a surge protector 280 connected with the energy storage converter 250 and grounded, to perform lightning protection, improve stability and safety.

[0082] In the embodiments of the utility model, the units of the power grid frequency modulation system based on super capacitor can be realized by corresponding hardware or software units, and each unit can be an independent software and hardware unit, or can be integrated into a software and hardware unit, which does not limit the utility model.

[0083] Example Three

[0084] The power grid frequency modulation circuit based on super capacitor of the preferred embodiment of the utility model is as shown in Figure 4 , and reference is made to Figure 5 and Figure 6 ; including a plurality of capacitor modules 310 and one or more charging units 330 and energy storage converter 350;Wherein, energy storage converter 350 is in series between power grid 300 and one or more charging units 330, and a plurality of capacitor modules 310 are in series with charging unit 330;

[0085] A plurality of capacitor modules 310 are also connected with voltage detection unit 320, and voltage detection unit 320 is connected with charging unit 330;

[0086] Power grid 300 is connected with frequency detection unit 340, and frequency detection unit 340 is connected with frequency modulation unit 360, and frequency modulation unit 360 is connected with energy storage converter 350;

[0087] Capacitor module 310 is composed of a plurality of super capacitors (not shown in the figure);

[0088] Voltage detection unit 320 detects the voltage of a plurality of capacitor modules 310;

[0089] Charging unit 330 selects one of the first charging mode, the second charging mode and the third charging mode according to the voltage of capacitor module 310 to charge capacitor module 310;

[0090] Frequency detection unit 340 detects the frequency of power grid 300;

[0091] Energy storage converter 350 performs constant frequency on power grid 300 and is controlled by frequency modulation unit 360;Further, energy storage converter 350 performs constant frequency on power grid 300 by switching charging state or inverter state.

[0092] Frequency modulation unit 360 controls the working state of energy storage converter 350 to adjust the frequency of power grid 300 according to the frequency of power grid 300;For example: when the frequency of power grid 300 is low, control energy storage converter 350 to use inverter mode, otherwise use charging mode.

[0093] The working state of the energy storage converter 350 includes a charging state and an inverting state; the charging state includes rectifying the alternating current of the power grid 300 into direct current to charge the capacitor module 310; the inverting state includes inverting the direct current of the capacitor module 310 into alternating current to supply power to the power grid 300.

[0094] The capacitor module 310 is composed of multiple super capacitors to improve the capacitance and voltage; the voltage detection unit 320 detects the voltage of the multiple capacitor modules 310; the charging unit 330 selects one of the first charging mode, the second charging mode and the third charging mode according to the voltage of the capacitor module 310 to charge the capacitor module 310; the frequency detection unit 340 detects the frequency of the power grid 300; the energy storage converter 350 controls the frequency of the power grid 300; the frequency adjustment unit 360 controls the working state of the energy storage converter 350 to adjust the frequency of the power grid 300 to be constant;

[0095] The working state of the energy storage converter 350 includes a charging state and an inverting state; the charging state includes rectifying the alternating current of the power grid 300 into direct current to charge the capacitor module 310; the inverting state includes inverting the direct current of the capacitor module 310 into alternating current to supply power to the power grid 300; further, the energy storage converter 350 controls the frequency of the power grid 300 by switching the charging state or the inverting state;

[0096] For example, when the frequency of the power grid 300 is low, the direct current of the capacitor module 310 is inverted and boosted to alternating current to supply power to the power grid 300; on the contrary, when the frequency of the power grid 300 is high, the alternating current of the power grid 300 is rectified and boosted to direct current to charge the capacitor module 310, so as to realize constant frequency to compensate for the insufficient or excessive power generation of the power plant, which leads to the low or high frequency of the power grid 300;

[0097] Thus, the capacitor module 310 is charged by using different charging modes to store energy for frequency adjustment of the power grid 300, which compensates for the insufficient voltage of the capacitor module 310 which cannot be directly charged by using existing devices for a long time, and has low cost and small size, thereby improving the user experience.

[0098] As shown in Figure 4 Further, the power-off unit 370 is connected in series between the energy storage converter 350 and the charging unit 330.

[0099] The power-off unit 370 disconnects the corresponding plurality of capacitor modules 310 from the power grid 300 according to the voltage of the plurality of capacitor modules 310, and is connected with the voltage detection unit 320 connected with the corresponding plurality of capacitor modules 310; and the power-off unit 370 disconnects the plurality of capacitor modules 310 from the power grid 300 in batches.

[0100] Further, the surge protector 380 is connected with the energy storage converter 350 and grounded, and is used for lightning protection, stability and safety.

[0101] As shown in Figure 4 to Figure 6 , the charging unit 330 further includes a first charging unit 331, a second charging unit 332 and a third charging unit 333.

[0102] The first charging unit 331 includes a charging resistor R1 connected in series between the energy storage converter 350 and the capacitor module 310, the second charging unit 332 includes a charging module U1 connected with the capacitor module 310 for charging the capacitor module 310, and the third charging unit 333 includes a normally open contact of a first contactor KM1 connected in series between the energy storage converter 350 and the capacitor module 310; for example, the series charging resistor is suitable for the voltage of the capacitor module 310 being 0V-150V, the charging module U1 is used when the voltage of the capacitor module 310 is 150V-1000V, and the energy storage converter 350 is used when the voltage of the capacitor module 310 is higher than 1000V; wherein the charging module U1 is a rectifier and voltage reduction module.

[0103] The first charging mode uses the first charging unit 331 to charge the capacitor module 310, the second charging mode uses the second charging unit 332 to charge the capacitor module 310, and the third charging mode uses the third charging unit 333 to charge the capacitor module 310; the circuit is simple, the cost is low, the volume is small, and the power loss is low.

[0104] Preferably, the charging module U1 takes power from any one of the power grid 300, the energy storage converter 350 and three-phase AC mains; to meet different use requirements.

[0105] As shown in Figure 4 , the power-off unit 370 further includes a plurality of normally open contacts of a second contactor (not shown in the figure); the plurality of normally open contacts of the contactor are used for switching off power; the circuit is simple, easy to control, and high in safety.

[0106] As shown in Figure 4 , it further includes a capacitor stack 400.

[0107] The capacitor stack 400 includes the power-off unit 370, the charging unit 330, the capacitor cluster 410 and the voltage detection unit 320.

[0108] The capacitor cluster 410 comprises a plurality of series-connected capacitor modules 310; the capacitor cluster 410 is combined into one energy storage cabinet, is used modularly, is convenient for expansion and installation, and is convenient for maintenance.

[0109] As shown in Figure 4 and Figure 6 , the second charging unit 332 comprises a charging module U1 and a third contactor KM3.

[0110] The coil of the first contactor KM1 is interlocked with the coil of the third contactor KM3; the high-voltage reverse input of the energy storage converter 350 to the capacitor cluster 410 is avoided from being input to the charging module U1, so as to cause damage of the charging module U1.

[0111] The plurality of normally open contacts of the third contactor KM3 control the power input of the charging module U1, and the safety is high.

[0112] As shown in Figure 4 and Figure 5 , the first charging unit 331 further comprises a fourth contactor KM4.

[0113] The normally open contact of the fourth contactor KM4 is connected in series with the charging resistor R1 and is connected in series between the energy storage converter 350 and the capacitor module 310; the charging control using the charging resistor R1 is realized.

[0114] Further preferably, the first charging mode and the second charging mode and the third charging mode all perform constant-voltage constant-current charging on the capacitor module 310, so as to meet different use requirements.

[0115] Preferably, the charging unit 330 further selects one of a plurality of charging modes according to the voltage of the capacitor module 310 to charge the plurality of capacitor modules 310; different charging use requirements are adapted to;

[0116] The plurality of charging modes at least comprise the first charging mode, the second charging mode and the third charging mode.

[0117] Example Four

[0118] Embodiment four of the utility model provides a kind of computer program product, computer program product includes computer program stored on nonvolatile computer readable storage medium, computer program includes program instruction, when program instruction is executed by processor, make processor execute the power grid frequency modulation method based on super capacitor of above-mentioned method embodiment. For example, the method steps S101 to step S104 in Figure 1 Described above are executed.

[0119] The above-described embodiments are merely illustrative for the present application, wherein the units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment.

[0120] Through the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be implemented by means of software plus a general hardware platform, and of course, can also be implemented by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product in essence or in the form of a part of the related technology. The computer software product can exist in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions to make a computer electronic device (which can be a personal computer, a server, or a network electronic device, etc.) execute the method of each embodiment or some part of the embodiment.

[0121] Conditional language such as, among others, "can," "could," "might" or "may," unless specifically stated otherwise, generally are intended to convey that a certain feature, element or operation can or can not be included in some embodiments of the present application. Thus, such conditional language generally is not intended to imply that a feature, element or operation is in any way required in one or more embodiments or that one or more embodiments necessarily include logic for deciding, with or without author or user input or prompting, whether these features, elements and / or operations are included or are to be performed in any particular embodiment.

[0122] What has been described herein in the present specification and drawings includes examples that can provide a supercapacitor-based grid frequency modulation circuit. Of course, not every conceivable combination of elements and / or methods described for the purpose of describing various features of the present disclosure can be described, but it can be recognized that many additional combinations and permutations of the disclosed features are possible. It will be apparent, therefore, that various modifications can be made to the present disclosure without departing from the scope or spirit of the present disclosure. Further, or in the alternative, other embodiments of the present disclosure can be apparent from consideration of the specification and drawings and practice of the present disclosure as presented herein. It is intended that the examples presented in the specification and drawings be considered as illustrative in all respects and not restrictive. Although specific terms are employed in the present disclosure, they are used in a generic and descriptive sense only and not for limitation purposes.

Claims

1. A supercapacitor-based grid frequency regulation circuit comprising a plurality of capacitor modules and one or more charging units and an energy storage inverter; characterized in that, The energy storage converter is connected in series between the power grid and one or more of the charging units, and a plurality of the capacitor modules are connected in series with the charging unit; A plurality of the capacitor modules are further connected to a voltage detection unit, and the voltage detection unit is connected to the charging unit; The power grid is connected to a frequency detection unit, and the frequency detection unit is connected to a frequency adjustment unit, and the frequency adjustment unit is connected to the energy storage converter; A capacitor module is composed of a plurality of supercapacitors; A voltage detection unit detects the voltage of a plurality of the capacitor modules; A charging unit selects one of a first charging mode, a second charging mode, and a third charging mode according to the voltage of the capacitor module to charge the capacitor module; A frequency detection unit detects the frequency of the power grid; An energy storage converter maintains a constant frequency of the power grid and is controlled by a frequency adjustment unit; The frequency adjustment unit controls the working state of the energy storage converter according to the frequency of the power grid to adjust the frequency of the power grid to a constant frequency; The working state of the energy storage converter includes a charging state and an inverter state; the charging state includes converting alternating current from the power grid into direct current and delivering the direct current to the capacitor module for charging; and the inverter state includes converting direct current from the capacitor module into alternating current and delivering the alternating current to the power grid for power supply.

2. The supercapacitor-based grid frequency regulation circuit of claim 1, wherein, Further comprising: A power-off unit connected in series between the energy storage converter and the charging unit; The power-off unit disconnects a plurality of the capacitor modules connected to the power grid according to the voltage of the plurality of the capacitor modules, and the power-off unit is connected to the voltage detection unit connected to the plurality of the capacitor modules.

3. The ultracapacitor-based grid frequency modulation circuit of claim 1, wherein, The charging unit further comprises a first charging unit, a second charging unit, and a third charging unit; The first charging unit comprises a charging resistor connected in series between the energy storage converter and the capacitor module, the second charging unit comprises a charging module connected to the capacitor module to charge the capacitor module, and the third charging unit comprises a normally open contact of a first contactor connected in series between the energy storage converter and the capacitor module; The first charging mode uses the first charging unit to charge the capacitor module, the second charging mode uses the second charging unit to charge the capacitor module, and the third charging mode uses the third charging unit to charge the capacitor module.

4. The ultracapacitor-based grid frequency modulation circuit of claim 3, wherein, The charging module takes power from any one of the power grid, the energy storage converter, and three-phase alternating current power.

5. The ultracapacitor-based grid frequency modulation circuit of claim 2, wherein, The power-off unit further comprises a plurality of normally open contacts of a second contactor.

6. The supercapacitor-based grid frequency regulation circuit of claim 2, wherein, Further comprising: A capacitor stack; The capacitor stack comprises the power-off unit, the charging unit, a capacitor cluster, and the voltage detection unit; The capacitor cluster comprises a plurality of the capacitor modules connected in series.

7. The ultracapacitor-based grid frequency modulation circuit of claim 3, wherein, The second charging unit comprises a charging module and a third contactor; The coil of the first contactor is interlocked with the coil of the third contactor; The plurality of normally open contacts of the third contactor control the power input of the charging module.

8. The supercapacitor-based grid frequency regulation circuit of claim 3, wherein, The first charging unit further comprises a fourth contactor; The normally open contact of the fourth contactor is connected in series with the charging resistor and then connected in series between the energy storage converter and the capacitor module. 9.The supercapacitor-based grid frequency modulation circuit of claim 1, wherein, The first charging mode, the second charging mode, and the third charging mode are all constant-voltage constant-current charging modes for the capacitor module.

10. The supercapacitor-based grid frequency modulation circuit of claim 1, wherein, The charging unit selects one of a plurality of charging modes according to the voltage of the capacitor module to charge the plurality of capacitor modules. The plurality of charging modes at least include the first charging mode, the second charging mode, and the third charging mode.

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