Power supply apparatus, and method for generating superimposed voltage

Abstract

Provided in the embodiments of the present application are a power supply apparatus, and a method for generating a superimposed voltage, which apparatus and method can effectively improve the insulation performance of an energy storage device. The power supply apparatus comprises: an alternating-current voltage generation apparatus, which is used for generating an alternating-current voltage; and a pulse voltage generation apparatus, which is used for generating a pulse voltage, wherein the power supply apparatus is used for outputting a superimposed voltage obtained by superimposing the pulse voltage and the alternating-current voltage.

Description

Power supply device and method for generating superimposed voltage Cross-reference to related applications

[0001] The present application claims priority to Chinese Patent Application No. 202411375568.1, filed on September 29, 2024, entitled “Power supply device and method for generating superimposed voltage”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of electric power, and in particular to a power supply device and a method for generating superimposed voltage. BACKGROUND

[0003] With the popularization and application of new energy, energy storage technology has also developed. The common-mode interference voltage generated by the energy storage device when the energy storage converter is working will act on the insulation of the energy storage device for a long time, thereby affecting the insulation safety of the energy storage device.

[0004] Therefore, how to test the insulation performance of the energy storage device under the real voltage waveform is a problem to be solved. SUMMARY

[0005] The embodiments of the present application provide a power supply device and a method for generating superimposed voltage, which can output a test voltage consistent with the real voltage to test the insulation safety of the energy storage device, thereby effectively improving the insulation performance of the energy storage device.

[0006] In a first aspect, a power supply device is provided, comprising: an alternating voltage generating device configured to generate an alternating voltage; and a pulse voltage generating device configured to generate a pulse voltage; wherein the power supply device is configured to output a superimposed voltage obtained by superimposing the pulse voltage and the alternating voltage.

[0007] Since the common-mode interference voltage generated by the energy storage device when the PCS is working is a higher pulse voltage superimposed on the basis of the alternating voltage of the positive electrode to ground voltage and the negative electrode to ground voltage, the power supply device of the embodiments of the present application outputs the superimposed voltage obtained by superimposing the alternating voltage and the pulse voltage, so that the insulation withstand voltage test of the superimposed voltage of the alternating voltage and the pulse voltage can be realized based on the power supply device. The withstand voltage test can determine the tolerance law of the insulation of the energy storage device to the superimposed voltage, and then the insulation safety performance of the energy storage device can be improved based on the tolerance law, which is conducive to the stable operation of the energy storage system.

[0008] In some possible implementation manners, the pulse voltage generating device comprises a first alternating current power supply, a direct current voltage generating module and a pulse voltage generating module; the first alternating current power supply is configured to output a first alternating current voltage; the direct current voltage generating module is configured to convert the first alternating current voltage into a direct current voltage; and the pulse voltage generating module is configured to convert the direct current voltage into the pulse voltage.

[0009] The technical scheme comprises the following steps: the first alternating current power supply is configured to output a first alternating current voltage; the direct current voltage generating module is configured to convert the first alternating current voltage into a direct current voltage; and the pulse voltage generating module is configured to convert the direct current voltage into the pulse voltage.

[0010] In some possible implementation manners, the pulse voltage generating module comprises a first switch, a second switch, a first capacitor, a second capacitor and a load, and the first capacitor and the second capacitor are connected to the direct current voltage generating module; when the first switch is turned on, the direct current voltage on the first capacitor is converted into a first polarity pulse voltage on the load; when the second switch is turned on, the direct current voltage on the second capacitor is converted into a second polarity pulse voltage on the load, the second polarity being different from the first polarity, and the first polarity pulse voltage and the second polarity pulse voltage form the pulse voltage.

[0011] The technical scheme comprises the following steps: the first alternating current power supply is configured to output a first alternating current voltage; the direct current voltage generating module is configured to convert the first alternating current voltage into a direct current voltage; and the pulse voltage generating module is configured to convert the direct current voltage into the pulse voltage.

[0012] In some possible implementation manners, a first end of the first switch is connected to a first end of the first capacitor, a second end of the first switch is connected to a second end of the load and a second end of the second switch, a first end of the load is connected to a second end of the first capacitor and a first end of the second capacitor, and a second end of the second capacitor is connected to a first end of the second switch.

[0013] In some possible implementation manners, the pulse voltage generating device further comprises an isolation transformer, and the isolation transformer is arranged between the first alternating current power supply and the direct current voltage generating module.

[0014] The isolation transformer is arranged between the first alternating current power supply and the direct current voltage generating module, so that the pulse voltage can be lifted to be superimposed with the alternating current voltage, and the power supply device can output a voltage waveform that conforms to an actual condition.

[0015] In some possible implementation manners, the withstand voltage of the isolation transformer is greater than the AC voltage. In this way, the problem of AC voltage breaking down the isolation transformer can be avoided to a certain extent, and the successful implementation of the withstand voltage test is ensured.

[0016] In some possible implementation manners, the withstand voltage of the isolation transformer should be greater than the maximum value of the AC voltage.

[0017] The technical solution described above selects the withstand voltage of the isolation transformer to be greater than the maximum value of the AC voltage, avoids the problem of the AC voltage breaking down the isolation transformer, and thus ensures the successful implementation of the withstand voltage test.

[0018] In some possible implementation manners, the pulse voltage generating device further includes a first voltage regulating module, which is connected with the first AC power supply and the DC voltage generating module respectively, and is configured to adjust the amplitude of the first AC voltage and output the adjusted first AC voltage to the DC voltage generating module.

[0019] The technical solution described above includes the first voltage regulating module configured to adjust the amplitude of the first AC voltage, so that the user can adjust the amplitude of the first AC voltage output by the first AC power supply based on actual conditions. In this way, the amplitude of the pulse voltage is controllable, and the power supply device can be applied to different application scenarios, thereby effectively improving the application flexibility of the power supply device.

[0020] In some possible implementation manners, the AC voltage generating device includes a second AC power supply and a second voltage regulating module connected with the second AC power supply; the second AC power supply is configured to generate a second AC voltage, and the second voltage regulating module is configured to adjust the amplitude of the second AC voltage to a target amplitude, and the adjusted second AC voltage is the AC voltage.

[0021] The technical solution described above includes the second voltage regulating module configured to adjust the amplitude of the second AC voltage, so that the user can adjust the amplitude of the second AC voltage output by the second AC power supply based on actual conditions. In this way, the amplitude of the AC voltage is controllable, and the power supply device can be applied to different application scenarios, thereby effectively improving the application flexibility of the power supply device.

[0022] In some possible implementation manners, the power supply device further includes a control module configured to monitor the superimposed voltage, determine an adjustment amount of the superimposed voltage according to the deviation between the superimposed voltage and a target voltage, and input the adjustment amount to the AC voltage generating device and the pulse voltage generating device; and the AC voltage generating device and the pulse voltage generating device are further configured to generate an adjusted AC voltage and an adjusted pulse voltage according to the adjustment amount.

[0023] The technical solution described above determines the adjustment amount according to the superimposed voltage and the target voltage, and causes the alternating voltage generating device and the pulse voltage generating device to output the adjusted alternating voltage and pulse voltage according to the adjustment amount, so that the deviation between the alternating superimposed pulse voltage finally output by the power supply device and the expected voltage waveform can be minimized, and the power supply device can more accurately output the superimposed voltage of the alternating voltage superimposed pulse voltage.

[0024] In a second aspect, a method for generating a superimposed voltage is provided, including: generating an alternating voltage by an alternating voltage generating device; generating a pulse voltage by a pulse voltage generating device; and outputting a superimposed voltage obtained after the pulse voltage and the alternating voltage are superimposed.

[0025] In some possible implementation manners, the pulse voltage generating device includes a first alternating power supply, a direct current voltage generating module, and a pulse voltage generating module, and the generating the pulse voltage by the pulse voltage generating device includes: generating a first alternating voltage by the first alternating power supply; connecting the first alternating voltage to the direct current voltage generating module and converting the first alternating voltage into a direct current voltage; and connecting the direct current voltage to the pulse voltage generating module and converting the direct current voltage into the pulse voltage.

[0026] In some possible implementation manners, the pulse voltage generating module includes a first switch, a second switch, a first capacitor, a second capacitor, and a load, the first capacitor and the second capacitor are connected to the direct current voltage generating module, and the converting the direct current voltage into the pulse voltage includes: converting the direct current voltage on the first capacitor into a first polarity pulse voltage on the load when the first switch is turned on; and converting the direct current voltage on the second capacitor into a second polarity pulse voltage on the load when the second switch is turned on, the second polarity being different from the first polarity, and the first polarity pulse voltage and the second polarity pulse voltage form the pulse voltage.

[0027] In some possible implementation manners, a first end of the first switch is connected to a first end of the first capacitor, a second end of the first switch is connected to a second end of the load and a second end of the second switch, a first end of the load is connected to a second end of the first capacitor and a first end of the second capacitor, and a second end of the second capacitor is connected to a first end of the second switch.

[0028] In some possible implementation manners, the pulse voltage generating device further includes an isolation transformer, and the connecting the first alternating voltage to the direct current voltage generating module includes: connecting the first alternating power supply to the direct current voltage generating module and the isolation transformer.

[0029] In some possible implementation manners, the withstand voltage value of the isolation transformer is greater than or equal to the alternating voltage.

[0030] In some possible implementation manners, the withstand voltage value of the isolation transformer is greater than or equal to a maximum value of the alternating voltage.

[0031] In some possible implementation manners, the pulse voltage generating apparatus further comprises a first voltage regulating module connected with the first alternating power supply and the direct current voltage generating module respectively, and the method further comprises: adjusting an amplitude of the first alternating voltage by the first voltage regulating module; and converting the first alternating voltage into the direct current voltage comprises converting the adjusted first alternating voltage into the direct current voltage.

[0032] In some possible implementation manners, the alternating voltage generating apparatus comprises a second alternating power supply and a second voltage regulating module connected with the second alternating power supply, and the generating the alternating voltage by the alternating voltage generating apparatus comprises: generating a second alternating voltage by the second alternating power supply; and adjusting an amplitude of the second alternating voltage to a target amplitude by the second voltage regulating module, and the adjusted second alternating voltage is the alternating voltage.

[0033] In some possible implementation manners, the method further comprises: monitoring the superimposed voltage; determining an adjustment amount of the superimposed voltage according to a deviation between the superimposed voltage and a target voltage; inputting the adjustment amount to the alternating voltage generating apparatus and the pulse voltage generating apparatus; the generating the alternating voltage by the alternating voltage generating apparatus comprises: generating the adjusted alternating voltage according to the adjustment amount; and the generating the pulse voltage by the pulse voltage generating apparatus comprises: generating the adjusted pulse voltage according to the adjustment amount.

[0034] In a third aspect, a computer readable storage medium is provided, configured to store a computer program, which causes a computer to execute the method in the second aspect or the implementation manners thereof. BRIEF DESCRIPTION OF DRAWINGS

[0035] FIG. 1 shows a schematic diagram of a sub-module of an energy storage system according to an embodiment of the present application.

[0036] FIG. 2 shows a schematic block diagram of a power supply apparatus according to an embodiment of the present application.

[0037] FIG. 3 shows a schematic block diagram of a pulse voltage generating apparatus according to an embodiment of the present application.

[0038] FIG. 4 shows a schematic block diagram of another pulse voltage generating apparatus according to an embodiment of the present application.

[0039] Fig. 5 shows a schematic block diagram of yet another pulse voltage generation apparatus according to embodiments of the present application.

[0040] Fig. 6 shows a schematic block diagram of still another pulse voltage generation apparatus according to embodiments of the present application.

[0041] Fig. 7 shows a schematic diagram of a pulse voltage generation module according to embodiments of the present application.

[0042] Fig. 8 shows a schematic diagram of a control signal according to embodiments of the present application.

[0043] Fig. 9 shows a schematic diagram of a direction of a first polarity pulse voltage according to embodiments of the present application.

[0044] Fig. 10 shows a schematic diagram of a direction of a second polarity pulse voltage according to embodiments of the present application.

[0045] Fig. 11 shows a detailed schematic block diagram of a power supply apparatus according to embodiments of the present application.

[0046] Fig. 12 shows a topology diagram of a power supply apparatus corresponding to Fig. 11.

[0047] Fig. 13 shows a simulation waveform diagram based on the topology diagram of Fig. 12.

[0048] Fig. 14 shows a detailed schematic block diagram of another power supply apparatus according to embodiments of the present application.

[0049] Fig. 15 shows a flowchart of a method of superimposed voltage generation according to embodiments of the present application. DETAILED DESCRIPTION

[0050] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0051] 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 this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The articles "a", "an", and "the" are used herein to refer to one or to more than one (i.e. to at least one) of the grammatical object of the article. By the use of the term "including" followed by a listing of items, do not exclude additional, unrecited items. By use of the terms "first", "second" etc. do not preclude the presence of third and / or a fourth and / or similar such terms and the herein described or illustrated first and second items can, in some embodiments, be replaced by third and / or a fourth and / or similar such items. Any reference signs in the claims should not be construed as limiting the scope of the claims.

[0052] The orientation words appearing in the following description are the directions shown in the drawings, and are not intended to limit the specific structure of the present application. It should be noted in the description of the present application that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "connection" should be understood broadly, for example, they can be fixed connection, or detachable connection, or integral connection; they can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0054] In the present application, "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0055] With the popularization and application of new energy, energy storage technology has developed. Energy storage system is a device or system that can store energy and release it when needed. In the field of new energy, energy storage system generally refers to a device that can store electrical energy and release it during peak electricity consumption. Energy storage systems play multiple roles in power systems, including load balancing, frequency regulation, backup power, peak-valley electricity price management, and improving grid stability. With the rapid development of renewable energy, the importance of energy storage systems is increasing.

[0056] Currently, electrochemical energy storage represented by lithium-ion batteries is the highest proportion of energy storage technology besides pumped storage. As shown in FIG. 1, the basic unit of an electrochemical energy storage system is called a sub-module, which is mainly composed of a battery, a power conversion system (PCS), a filter, an insulating part, etc. The insulation mainly includes the insulation of the positive and negative electrodes of the battery to ground and the insulation between the poles of the PCS, and the insulation of the positive and negative electrodes of the battery to ground is an important part of the insulation.

[0057] The post insulator in FIG. 1 is one of the insulating parts, which is usually composed of an insulating component (such as a porcelain part) and a metal accessory (such as a steel foot, an iron cap, a flange, etc.), and is formed by gluing or mechanical clamping. The main function of the post insulator is to provide insulation support between the live conductors of overhead transmission lines, busbars of power plants and substations, and various electrical equipment, and to insulate them from the ground or other conductors with potential difference.

[0058] During the operation of the PCS, a common-mode interference voltage is generated, which is superimposed on the alternating voltage and acts on the insulation of the pole-to-ground of the sub-modules for a long time, including the insulation of the positive and negative poles of the battery to the ground and the insulation of the pole-to-ground of the PCS. However, the current rule of the insulation of the pole-to-ground to withstand the common-mode interference voltage is unknown.

[0059] In view of this, the power supply device provided in the embodiments of the present application includes an alternating voltage generating device and a pulse voltage generating device. The alternating voltage generating device is configured to generate an alternating voltage, and the pulse voltage generating device is configured to generate a pulse voltage. The power supply device outputs a superimposed voltage obtained by superimposing the pulse voltage and the alternating voltage. Since the common-mode interference voltage generated by the energy storage device during the operation of the PCS is a higher pulse voltage superimposed on the alternating voltage on the basis of the positive pole-to-ground and the negative pole-to-ground of the direct current side, the power supply device outputs the superimposed voltage obtained by superimposing the pulse voltage and the alternating voltage. Therefore, the energy storage device can be subjected to a withstand voltage test of the alternating voltage superimposed with the pulse voltage based on the power supply device. The withstand voltage test can determine the rule of the insulation of the energy storage device to withstand the superimposed voltage, and the insulation performance of the energy storage device can be improved based on the rule, which is conducive to the stable operation of the energy storage system.

[0060] The energy storage device may, for example, be a battery. The energy storage device may, for example, include a plurality of batteries, the plurality of batteries may, for example, include a plurality of battery clusters, the plurality of battery clusters may, for example, be connected in parallel, each battery cluster may, for example, include four batteries, and each battery may, for example, include 104 battery monomers connected in series.

[0061] FIG. 2 shows a schematic diagram of a power supply device 200 according to an embodiment of the present application.

[0062] As shown in FIG. 2, the power supply device 200 includes an alternating voltage generating device and a pulse voltage generating device. The alternating voltage generating device is configured to generate an alternating voltage, and the pulse voltage generating device is configured to generate a pulse voltage. The power supply device is configured to output a superimposed voltage obtained by superimposing the pulse voltage and the alternating voltage.

[0063] The amplitude and frequency of the alternating voltage can be set values. For example, the frequency of the alternating voltage can be 50 Hz (Hertz), in which case the alternating voltage can also be referred to as a power frequency voltage, or the frequency of the alternating voltage can be 40 Hz, 60 Hz, 80 Hz, 90 Hz, 100 Hz, or other values. For another example, the amplitude of the alternating voltage can be 100 V, 110 V, 150 V, 220 V, 300 V, 380 V, 400 V, or the like.

[0064] The common-mode interference voltage generated by the energy storage device when the PCS is working is a higher pulse voltage superimposed on the alternating voltage based on the positive electrode of the direct current side to ground and the negative electrode to ground. Therefore, the superimposed voltage obtained by superimposing the pulse voltage and the alternating voltage output by the power supply device of the embodiments of the present application, so that the withstand voltage test of the superimposed voltage based on the power supply device can be realized, and the withstand rule of the insulation of the energy storage device to the superimposed voltage can be determined through the withstand voltage test, and then the insulation performance of the energy storage device can be improved based on the withstand rule, which is conducive to the stable operation of the energy storage system.

[0065] It should be noted that the basis of the superimposed voltage is the alternating voltage, and the superimposed voltage is a composite voltage waveform obtained by superimposing the pulse voltage on the basis of the alternating voltage.

[0066] The pulse voltage generating device of the embodiments of the present application will be described first.

[0067] In some embodiments, the pulse voltage generating device can include a first alternating power supply and a pulse voltage generating module. The first alternating power supply is used to generate a first alternating voltage, and the pulse voltage generating module is used to access the first alternating power supply and convert the first alternating voltage into a pulse voltage.

[0068] The first alternating power supply may, for example, be a single-phase 220V alternating power supply. Of course, the first alternating power supply can also be other alternating power supplies, which are not specifically limited in the embodiments of the present application.

[0069] Considering that in actual situations, the pulse voltage is generated by the PCS during switching, and the direct current voltage at the time of switching, in order to be more close to the actual working condition, the pulse voltage generating device of the embodiments of the present application can include a direct current voltage generating module in addition to the first alternating power supply and the pulse voltage generating module.

[0070] The direct current voltage generating module accesses the first alternating power supply and converts the first alternating voltage into a direct current voltage, and the pulse voltage generating module is used to convert the accessed direct current voltage into a pulse voltage.

[0071] The technical scheme is characterized in that the first alternating-current power supply, the direct-current voltage generating module and the pulse voltage generating module are arranged, that is, the rectifier circuit is used to generate a direct-current voltage, and the pulse voltage generating module is used to convert the direct-current voltage into a pulse voltage, and the power electronic switching device is used to make the process of generating the pulse voltage close to the actual working condition, so that the power supply device can more accurately implement the insulation withstand voltage test of superimposing the pulse voltage on the alternating voltage.

[0072] The direct-current voltage generating module can be a half-wave rectifier circuit, a full-wave rectifier circuit, a bridge rectifier circuit, a voltage doubler rectifier circuit or the like.

[0073] In view of the fact that the voltage in the actual working condition can be high voltage, and the voltage doubler rectifier circuit can convert the input low-voltage alternating current into high-voltage direct current, the direct-current voltage generating module in the embodiment of the application can be a voltage doubler rectifier circuit. If the amplitude of the required direct-current voltage is high, the number of stages of the voltage doubler rectifier circuit can be increased.

[0074] In different scenarios, the amplitude and frequency of the common-mode interference voltage generated by the energy storage device when the PCS is working can be different, so that the amplitude and frequency of the pulse voltage are also different. In order to make the power supply device in the embodiment of the application applicable to different scenarios, as shown in FIG. 3, the pulse voltage generating device can further include a first voltage regulating module.

[0075] The first voltage regulating module is connected with the first alternating-current power supply and the direct-current voltage generating module respectively, and is used to adjust the amplitude of the first alternating voltage and output the adjusted first alternating voltage to the direct-current voltage generating module.

[0076] The first voltage regulating module can adjust the amplitude of the first alternating voltage according to relevant factors such as the external environment, the geographical location of the energy storage system, the type of the energy storage device, the attribute parameters of the energy storage device, the type or attribute parameters of the PCS, and the like.

[0077] The first voltage regulating module can include a conventional voltage regulator, or can also adopt an alternating-alternating (AC-AC) mode based on power electronic technology.

[0078] The technical scheme is characterized in that the first voltage regulating module is arranged to adjust the amplitude of the first alternating voltage, so that the user can adjust the amplitude of the first alternating voltage output by the first alternating-current power supply based on the actual situation, and the amplitude of the pulse voltage is controllable, so that the power supply device can be applicable to different application scenarios, and the application flexibility of the power supply device is effectively improved.

[0079] If the amplitude of the required pulse voltage is high, the pulse voltage generating device can further include a step-up transformer. Exemplarily, the step-up transformer can be connected to the output end of the first voltage regulating module.

[0080] Figure 4 shows a schematic diagram of the pulse voltage generating device including a first AC power supply, a first voltage regulating module and a step-up transformer. The first voltage regulating module in Figure 4 includes a voltage regulator. Based on the pulse voltage generating device shown in Figure 4, the amplitude of the output voltage of the step-up transformer can satisfy the following formula: U2 = K1 * K2 * U1

[0081] wherein U1 is the amplitude of the first AC voltage, U2 is the amplitude of the output voltage of the step-up transformer, K1 is the transformation ratio of the voltage regulator, which is variable; and K2 is the transformation ratio of the step-up transformer, which is fixed.

[0082] In order to enable the pulse voltage to be superimposed on the AC voltage, as shown in Figure 5, the pulse voltage generating device can further include an isolation transformer, which is arranged between the first AC power supply and the DC voltage generating module.

[0083] wherein the number of turns of the primary winding of the isolation transformer is the same as the number of turns of the secondary winding, i.e. the transformation ratio of the isolation transformer is 1:1. That is, the isolation transformer does not change the voltage size.

[0084] By arranging the isolation transformer, the pulse voltage can be lifted so that the pulse voltage can be superimposed on the AC voltage, thereby ensuring that the power supply device can output an actual voltage waveform.

[0085] Since the pulse voltage is superimposed on the AC voltage, if the withstand voltage value of the isolation transformer is lower than the AC voltage, the AC voltage can break down the isolation transformer.

[0086] Therefore, in the embodiments of the present application, the withstand voltage value of the isolation transformer is greater than the AC voltage. Further, the withstand voltage value of the isolation transformer can be greater than the maximum value of the AC voltage.

[0087] In this way, the problem of the AC voltage breaking down the isolation transformer is avoided, thereby ensuring the smooth progress of the withstand voltage test.

[0088] Figure 6 shows a schematic diagram of the pulse voltage generating device including a first AC power supply, a first voltage regulating module, an isolation transformer and a DC voltage generating module. As shown in Figure 6, the first voltage regulating module includes a voltage regulator, the DC voltage generating module includes a voltage doubling rectifier circuit, and the voltage doubling rectifier circuit is a 4-voltage doubling rectifier circuit.

[0089] wherein the amplitude U3 of the DC voltage output by the DC voltage generating module can satisfy the following formula: U3 ≤ K1 * 4√2 * U1

[0090] It should be noted that the C1 and C2 in FIG. 6 are arranged to generate the pulse voltage by the pulse voltage generating module. If only one of the C1 and C2 is arranged, the pulse voltage generating module can only generate a pulse voltage of one polarity, and the required positive and negative pulse voltages cannot be formed.

[0091] In some embodiments, the pulse voltage generating module can include a first switch, a second switch, a first capacitor, a second capacitor, and a load, and the first capacitor and the second capacitor are connected with the direct current voltage generating module. In a case where the first switch is turned on, the direct current voltage on the first capacitor is converted into a first polarity pulse voltage on the load, and in a case where the second switch is turned on, the direct current voltage on the second capacitor is converted into a second polarity pulse voltage on the load, the second polarity being different from the first polarity, and the first polarity pulse voltage and the second polarity pulse voltage form the pulse voltage.

[0092] The above technical solution can convert the direct current voltage into pulse voltages of two different polarities by using the capacitor, the switch, and the load, which is simple and low in cost.

[0093] The pulse voltage is a positive and negative pulse voltage. In a case where the first polarity is positive, the second polarity is negative, and in a case where the first polarity is negative, the second polarity is positive.

[0094] The first capacitor and the second capacitor can be, for example, the C1 and C2 in FIG. 6, and the direct current voltage on the first capacitor and the direct current voltage on the second capacitor are the same.

[0095] The first capacitor and the second capacitor being connected with the direct current voltage generating module can be understood as that the direct current voltage generating module and the pulse voltage generating module share the first capacitor and the second capacitor, that is, the first capacitor and the second capacitor belong to both the direct current voltage generating module and the pulse voltage generating module.

[0096] The first switch being turned on can be short-time conduction of the first switch, and similarly, the second switch being turned on can also be short-time conduction.

[0097] The first switch and the second switch can be all-controlled switches. For example, the first switch and the second switch can be gate-turn-off thyristors (GTOs), metal-oxide-semiconductor field-effect transistors (MOSFETs), insulate-gate bipolar transistors (IGBTs), and the like.

[0098] It should be noted that the first switch and the second switch are not turned on at the same time. In other words, when the first switch is turned on, the second switch is turned off; when the first switch is turned off, the second switch is turned on.

[0099] The load can be a resistor, an inductor, etc., and is used to receive the first polarity pulse voltage and the second polarity pulse voltage.

[0100] FIG. 7 shows a possible schematic diagram of the pulse voltage generating module, where G1 is the first switch, G2 is the second switch, R is the load, and C1 and C2 are the first capacitor and the second capacitor.

[0101] As shown in FIG. 7, the first end of the first switch is connected to the first end of the first capacitor, the second end of the first switch is connected to the second end of the load and the second end of the second switch, the first end of the load is connected to the second end of the first capacitor and the first end of the second capacitor, and the second end of the second capacitor is connected to the first end of the second switch.

[0102] In order to control the width and frequency of the pulse voltage, the first switch can be controlled by a control signal g1 and the second switch can be controlled by a control signal g2, as shown in FIG. 8, so that the width and frequency of the first polarity pulse voltage and the second polarity pulse voltage can be adjusted by controlling g1 and g2. The control signals g1 and g2 are usually weak voltage signals.

[0103] When the control signal g1 is high, the first switch G1 is turned on, and the DC voltage on the first capacitor C1 is converted into a first polarity pulse voltage (for the convenience of description, the first polarity is defined as positive), and the direction of the positive pulse voltage is shown in FIG. 9. When the control signal g2 is high, the second switch G2 is turned on, and the DC voltage on the second capacitor C2 is converted into a negative pulse voltage, and the direction of the negative pulse voltage is shown in FIG. 10. The pulse voltage can be obtained by the positive pulse voltage and the negative pulse voltage.

[0104] The above describes the pulse voltage generating device of the embodiments of the present application, and the following describes the AC voltage generating device.

[0105] In some embodiments, the AC voltage generating device can include a second AC power supply for generating a second AC voltage, and the second AC voltage is the basis of the superimposed voltage.

[0106] The second AC power supply can be different from the first AC power supply.

[0107] Alternatively, in order to reduce the size and cost of the power supply device, the second AC power supply and the first AC power supply can be the same AC power supply, i.e., the AC voltage generating device and the pulse voltage generating device share one AC power supply.

[0108] In order to make the power supply device of the embodiment of the present application applicable to different scenarios, in addition to the second alternating current power supply, the alternating voltage generating device can further include a second voltage regulating module.

[0109] The second voltage regulating module is connected with the second alternating current power supply, and is configured to adjust the amplitude of the second alternating voltage, i.e., adjusting the amplitude of the second alternating voltage to a target amplitude.

[0110] The second voltage regulating module can adjust the amplitude of the second alternating voltage according to relevant factors such as external environment, geographical location of the energy storage system, type of the energy storage device, attribute parameters of the energy storage device, type or attribute parameters of the PCS, etc.

[0111] Similar to the first voltage regulating module, the second voltage regulating module can include a conventional voltage regulator, or can also adopt an AC-AC mode based on power electronic technology.

[0112] The technical scheme, by setting the second alternating current power supply and the second voltage regulating module for adjusting the amplitude of the second alternating voltage, enables the second voltage regulating module to adjust the amplitude of the second alternating voltage output by the second alternating current power supply based on actual conditions, i.e., the amplitude of the alternating voltage is controllable, so that the power supply device can be applicable to different application scenarios, effectively improving the application flexibility of the power supply device.

[0113] If the amplitude of the required alternating voltage is high, the alternating voltage generating device can further include a step-up transformer. That is, the alternating voltage generating device can include the second alternating current power supply and the step-up transformer, or can include the second alternating current power supply, the second voltage regulating module and the step-up transformer.

[0114] An example of the alternating voltage generating device including the second alternating current power supply, the second voltage regulating module and the step-up transformer can refer to FIG. 4, and the amplitude U4 of the alternating voltage can satisfy the following formula: U4=K1*K2*U1

[0115] As can be seen, by adjusting the transformation ratio of the voltage regulator, the amplitude of the alternating voltage can be changed.

[0116] FIG. 11 is a specific schematic block diagram of the power supply device of the embodiment of the present application. FIG. 12 is a topology diagram of the power supply device corresponding to FIG. 11.

[0117] The alternating voltage generating device shown in FIG. 11 and FIG. 12 includes an alternating current power supply, a voltage regulator 1 and a step-up transformer. The pulse voltage generating device shares the alternating current power supply with the alternating voltage generating device, and includes an alternating current power supply, a voltage regulator 2, an isolation transformer, a direct current voltage generating module and a pulse voltage generating module. The alternating voltage generating device can generate high-voltage alternating voltage, and similarly, the pulse voltage generating device can generate high-voltage pulse voltage.

[0118] Fig. 13 is a simulation result based on the topology diagram of Fig. 12. It can be seen that the voltage U5 output by the power supply device is a voltage superimposed on the basis of the alternating voltage.

[0119] The superimposed voltage output by the power supply device in the above content can have a certain deviation from the expected voltage. Therefore, in order to minimize the deviation between the superimposed voltage output by the power supply device and the expected voltage, in addition to the modules mentioned in the above content, the power supply device can further include a control module for acquiring the superimposed voltage and determining an adjustment amount of the superimposed voltage according to the deviation between the superimposed voltage and the target voltage, and inputting the adjustment amount to the alternating voltage generating device and the pulse voltage generating device, respectively.

[0120] At this time, the alternating voltage generating device and the pulse voltage generating device are further configured to generate an adjusted alternating voltage and an adjusted pulse voltage according to the adjustment amount.

[0121] The control module can determine an adjustment amount according to the superimposed voltage and the target voltage collected in the current time each time the power supply device outputs the superimposed voltage, and input the adjustment amount to the alternating voltage generating device and the pulse voltage generating device until the deviation between the superimposed voltage output by the power supply device and the target voltage is within a preset range.

[0122] The target voltage can be an actual voltage actually generated by the energy storage device when the PCS is working.

[0123] Alternatively, the control module can receive the superimposed voltage output by the power supply device by itself.

[0124] Alternatively, as shown in Fig. 14, the power supply device can further include a measurement module that can acquire the superimposed voltage and send the superimposed voltage to the control module, and the control module can determine the adjustment amount according to the deviation between the superimposed voltage and the target voltage after receiving the superimposed voltage.

[0125] It should be noted that the control module can also acquire the alternating voltage generated by the alternating voltage generating device, and determine an alternating voltage adjustment amount according to the deviation between the alternating voltage and the target alternating voltage, and input the alternating voltage adjustment amount to the alternating voltage generating device, and the alternating voltage generating device generates an adjusted alternating voltage according to the alternating voltage adjustment amount. At the same time, the control module can also acquire the pulse voltage generated by the pulse voltage generating device, and determine a pulse voltage adjustment amount according to the deviation between the pulse voltage and the target pulse voltage, and input the pulse voltage adjustment amount to the pulse voltage generating device, and the pulse voltage generating device generates an adjusted pulse voltage according to the pulse voltage adjustment amount.

[0126] The technical solution described above determines the adjustment amount according to the deviation between the superimposed voltage and the target voltage, and causes the alternating voltage generating device and the pulse voltage generating device to output the adjusted alternating voltage and pulse voltage according to the adjustment amount, so that the deviation between the superimposed voltage finally output by the power supply device and the expected voltage can be minimized, and the power supply device can output the superimposed voltage of the alternating voltage superimposed with the pulse voltage more accurately.

[0127] The embodiments of the power supply device of the embodiments of the present application are described in detail above in combination with FIGS. 2-14, and the method embodiments of the embodiments of the present application are described below in combination with FIG. 15. It should be understood that the method embodiments correspond to the device embodiments, and similar descriptions can be referred to the device embodiments.

[0128] FIG. 15 shows a schematic flowchart of a method for generating a superimposed voltage according to an embodiment of the present application. As shown in FIG. 15, the method 300 for generating a superimposed voltage can include the following steps.

[0129] S310: generating an alternating voltage by an alternating voltage generating device.

[0130] S320: generating a pulse voltage by a pulse voltage generating device.

[0131] S330: outputting a superimposed voltage obtained after superimposing the pulse voltage and the alternating voltage.

[0132] Optionally, in some embodiments, the pulse voltage generating device includes a first alternating power supply, a direct current voltage generating module, and a pulse voltage generating module, and the generating a pulse voltage by the pulse voltage generating device includes: generating a first alternating voltage by the first alternating power supply; connecting the first alternating power supply to the direct current voltage generating module and converting the first alternating voltage into a direct current voltage; and connecting the direct current voltage to the pulse voltage generating module and converting the direct current voltage into the pulse voltage.

[0133] Optionally, in some embodiments, the pulse voltage generating module includes a first switch, a second switch, a first capacitor, a second capacitor, and a load, the first capacitor and the second capacitor are connected to the direct current voltage generating module, and the converting the direct current voltage into the pulse voltage includes: converting the direct current voltage on the first capacitor into a first polarity pulse voltage on the load when the first switch is turned on; and converting the direct current voltage on the second capacitor into a second polarity pulse voltage on the load when the second switch is turned on, the second polarity being different from the first polarity, and the first polarity pulse voltage and the second polarity pulse voltage form the pulse voltage.

[0134] Optionally, in some embodiments, a first end of the first switch is connected to a first end of the first capacitor, a second end of the first switch is connected to a second end of the load and a second end of the second switch, a first end of the load is connected to a second end of the first capacitor and a first end of the second capacitor, and a second end of the second capacitor is connected to a first end of the second switch.

[0135] Optionally, in some embodiments, the pulse voltage generating device further comprises an isolation transformer, and the accessing the first AC power source through the DC voltage generating module comprises: accessing the first AC power source through the DC voltage generating module and the isolation transformer.

[0136] Optionally, in some embodiments, a withstand voltage value of the isolation transformer is greater than the AC voltage.

[0137] Optionally, in some embodiments, the withstand voltage value of the isolation transformer is greater than a maximum value of the AC voltage.

[0138] Optionally, in some embodiments, the pulse voltage generating device further comprises a first voltage regulating module connected to the first AC power source and the DC voltage generating module, and the method further comprises: adjusting an amplitude of the accessed first AC voltage through the first voltage regulating module; and converting the first AC voltage into the DC voltage comprises converting the adjusted first AC voltage into the DC voltage.

[0139] Optionally, in some embodiments, the AC voltage generating device comprises a second AC power source and a second voltage regulating module connected to the second AC power source, and the generating the AC voltage through the AC voltage generating device comprises: generating a second AC voltage through the second AC power source; and adjusting an amplitude of the second AC voltage to a target amplitude through the second voltage regulating module, the adjusted second AC voltage being the AC voltage.

[0140] Optionally, in some embodiments, the method 300 further comprises: monitoring the superimposed voltage; determining an adjustment amount of the superimposed voltage according to a deviation between the superimposed voltage and a target voltage; inputting the adjustment amount to the AC voltage generating device and the pulse voltage generating device; the generating the AC voltage through the AC voltage generating device comprises: generating an adjusted AC voltage according to the adjustment amount; and the generating the pulse voltage through the pulse voltage generating device comprises: generating an adjusted pulse voltage according to the adjustment amount.

[0141] It should be understood that the method 300 shown in FIG. 15 can be performed by the power supply device in the foregoing embodiments, and the alternating voltage generating device and the pulse voltage generating device in the method 300 can be the alternating voltage generating device and the pulse voltage generating device in the power supply device. It should be understood that the steps or operations in FIG. 15 are only examples, and the embodiments of the present application can also perform other operations or variations of the various operations of FIG. 15.

[0142] The embodiments of the present application also provide a computer readable storage medium for storing a computer program, the computer program being used for executing the method of the various embodiments of the present application.

[0143] The computer readable storage medium described above can be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

[0144] The embodiments of the present application also provide a computer program product, which comprises a computer program stored on a computer readable storage medium, the computer program comprising program instructions, which, when executed by a computer, cause the computer to perform the method of the superimposed voltage generation.

[0145] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the present application and equivalents thereof without departing from the scope of the present application. In particular, the technical features mentioned in each of the embodiments can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A power supply device characterized by comprising: The power supply device is used for outputting a superimposed voltage obtained after the superposition of the pulse voltage and the alternating voltage. The pulse voltage generating device comprises a first alternating current power supply, a direct current voltage generating module and a pulse voltage generating module. The first alternating current power supply is used for generating a first alternating voltage, the direct current voltage generating module is used for connecting the first alternating current power supply and converting the first alternating voltage into a direct current voltage, and the pulse voltage generating module is used for converting the connected direct current voltage into the pulse voltage. The pulse voltage generating module comprises a first switch, a second switch, a first capacitor, a second capacitor and a load, and the first capacitor and the second capacitor are connected with the direct current voltage generating module.

2. The power supply device according to claim 1, characterized by When the first switch is turned on, the direct current voltage on the first capacitor is converted into a first polarity pulse voltage on the load, and when the second switch is turned on, the direct current voltage on the second capacitor is converted into a second polarity pulse voltage on the load, the second polarity being different from the first polarity, and the first polarity pulse voltage and the second polarity pulse voltage form the pulse voltage. The first end of the first switch is connected with the first end of the first capacitor, the second end of the first switch is connected with the second end of the load and the second end of the second switch, the first end of the load is connected with the second end of the first capacitor and the first end of the second capacitor, and the second end of the second capacitor is connected to the first end of the second switch.

3. The power supply device according to claim 2, characterized by The pulse voltage generating device further comprises an isolation transformer arranged between the first alternating current power supply and the direct current voltage generating module. The withstand voltage value of the isolation transformer is greater than the alternating voltage.

4. The power supply device according to claim 3, characterized by The withstand voltage value of the isolation transformer is greater than the maximum value of the alternating voltage.

5. The power supply device according to any one of claims 2 to 4, characterized by, The pulse voltage generating device further comprises a first voltage regulating module connected with the first alternating current power supply and the direct current voltage generating module respectively, used for adjusting the amplitude of the first alternating voltage and outputting the adjusted first alternating voltage to the direct current voltage generating module.

6. The power supply device according to claim 5, wherein The alternating voltage generating device comprises a second alternating current power supply and a second voltage regulating module connected with the second alternating current power supply.

7. The power supply device according to claim 6, wherein The second alternating current power supply is used for generating a second alternating voltage, and the second voltage regulating module is used for adjusting the amplitude of the second alternating voltage to a target amplitude, and the adjusted second alternating voltage is the alternating voltage.

8. The power supply device according to any one of claims 2 to 7, characterized by, The power supply device further comprises a control module used for monitoring the superimposed voltage, determining an adjustment amount of the superimposed voltage according to the deviation between the superimposed voltage and a target voltage, and inputting the adjustment amount to the alternating voltage generating device and the pulse voltage generating device.

9. The power supply device according to any one of claims 1 to 8, characterized by, The alternating voltage generating device and the pulse voltage generating device are further used for generating an adjusted alternating voltage and an adjusted pulse voltage according to the adjustment amount. The power supply device comprises:

10. The power supply device according to any one of claims 1 to 9, characterized by, generating an alternating voltage by an alternating voltage generating device; ​ ​ 11. A method of superimposed voltage generation, characterized by, ​ ​ generating a pulse voltage by a pulse voltage generating device; outputting a superimposed voltage obtained after superimposition of the pulse voltage and the alternating voltage.

12. The method of claim 11, wherein, The pulse voltage generating device comprises a first alternating power supply, a direct current voltage generating module and a pulse voltage generating module, and the generating of the pulse voltage by the pulse voltage generating device comprises: generating a first alternating voltage by the first alternating power supply; connecting the first alternating power supply by the direct current voltage generating module and converting the first alternating voltage into a direct current voltage; connecting the direct current voltage by the pulse voltage generating module and converting the direct current voltage into the pulse voltage.

13. The method of claim 12, wherein, The pulse voltage generating module comprises a first switch, a second switch, a first capacitor, a second capacitor and a load, the first capacitor and the second capacitor are connected with the direct current voltage generating module, and the converting of the direct current voltage into the pulse voltage comprises: converting the direct current voltage on the first capacitor into a first polarity pulse voltage on the load when the first switch is turned on; converting the direct current voltage on the second capacitor into a second polarity pulse voltage on the load when the second switch is turned on, the second polarity being different from the first polarity, and the first polarity pulse voltage and the second polarity pulse voltage forming the pulse voltage.

14. The method of claim 13, wherein, A first end of the first switch is connected with a first end of the first capacitor, a second end of the first switch is connected with a second end of the load and a second end of the second switch, a first end of the load is connected with a second end of the first capacitor and a first end of the second capacitor, and a second end of the second capacitor is connected to a first end of the second switch.

15. The method according to any one of claims 12 to 14, characterized in that, The pulse voltage generating device further comprises an isolation transformer, and the connecting of the first alternating power supply by the direct current voltage generating module comprises: connecting the first alternating power supply by the direct current voltage generating module and the isolation transformer.

16. The method of claim 15, wherein, A withstand voltage value of the isolation transformer is greater than the alternating voltage.

17. The method of claim 16, wherein, The withstand voltage value of the isolation transformer is greater than a maximum value of the alternating voltage.

18. The method according to any one of claims 12 to 17, characterized in that, The pulse voltage generating device further comprises a first voltage regulating module, the first voltage regulating module is connected with the first alternating power supply and the direct current voltage generating module respectively, and the method further comprises: adjusting an amplitude of the connected first alternating voltage by the first voltage regulating module; The converting of the first alternating voltage into a direct current voltage comprises: converting the adjusted first alternating voltage into the direct current voltage.

19. The method according to any one of claims 11 to 18, characterized in that, The alternating voltage generating device comprises a second alternating power supply and a second voltage regulating module connected with the second alternating power supply, and the generating of the alternating voltage by the alternating voltage generating device comprises: generating a second alternating voltage by the second alternating power supply; adjusting an amplitude of the second alternating voltage to a target amplitude by the second voltage regulating module, and the adjusted second alternating voltage being the alternating voltage.

20. The method of any one of claims 11 to 19, wherein, The method further comprises: monitoring the superimposed voltage; determining an adjustment amount of the superimposed voltage according to a deviation between the superimposed voltage and a target voltage; inputting the adjustment amount to the alternating voltage generating device and the pulse voltage generating device; the generating of the alternating voltage by the alternating voltage generating device comprises: generating the adjusted alternating voltage according to the adjustment amount; the generating of the pulse voltage by the pulse voltage generating device comprises: generating the adjusted pulse voltage according to the adjustment amount.

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