Harmonic current suppression method and apparatus, and electronic device and storage medium

Abstract

Provided in the present application are a harmonic current suppression method and apparatus, and an electronic device and a storage medium. The method comprises: acquiring an output current in a direct-current line of a direct-current energy storage valve; determining a multi-order harmonic current component on the basis of the output current; generating a harmonic compensation amount on the basis of the multi-order harmonic current component; and inputting the harmonic compensation amount into a direct-current energy storage valve control loop, and determining a modulation voltage value of the direct-current energy storage valve. By means of the method, the multi-order harmonic current component in the direct-current line of the direct-current energy storage valve is actively suppressed at a direct-current side.

Description

Harmonic current suppression method, device, electronic device and storage medium CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to the Chinese patent application entitled “Method, device, electronic device and storage medium for suppressing harmonic current” (application number: 202410172249.4) filed on February 6, 2024, and the entire contents of the application are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of high-voltage energy storage, and more specifically, to a harmonic current suppression method, device, electronic device, and storage medium. Background Art

[0003] The DC energy storage valve and the connected DC system are typically connected to the AC system via a converter. Under normal operating conditions, the three-phase balanced voltage on the AC side contains only positive-sequence components, without negative-sequence or zero-sequence components, and therefore no harmonic components. When the grid voltage is unbalanced, the presence of positive-sequence, negative-sequence, and DC components on the AC side will superimpose these components between the converter phases, producing power frequency, double-frequency, and other frequency-multiplied components of the positive-sequence, negative-sequence, and zero-sequence voltages. While the positive- and zero-sequence voltages cancel each other out between phases, the zero-sequence power frequency and double-frequency components cannot cancel each other out between phases and are transmitted to the DC side. This double-frequency voltage source will induce a double-frequency current on the DC side. For DC energy storage valves, this double-frequency current can adversely affect battery life.

[0004] Currently, multi-order harmonic components are usually detected at the AC side converter to achieve multi-order harmonic component suppression. However, multi-order harmonic component suppression at the AC side converter has the problem of complex control strategy. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a harmonic current suppression method, device, electronic device and storage medium, so as to achieve multi-order harmonic suppression on the DC side.

[0006] In a first aspect, the present application provides a harmonic current suppression method, comprising: obtaining an output current on a DC line of a DC energy storage valve; determining multi-order harmonic current components based on the output current; generating a harmonic compensation amount based on the multi-order harmonic current components; and inputting the harmonic compensation amount into a DC energy storage valve control loop to determine a modulation voltage value of the DC energy storage valve.

[0007] In an embodiment of the present application, the output current of a DC circuit of a DC energy storage valve is obtained, and multi-order harmonic current components in the output current are determined based on the obtained output current. A harmonic compensation value is generated based on the multi-order harmonic current components to suppress the multi-order harmonic current components in the DC circuit. The harmonic compensation value is input into a control loop of the DC energy storage valve, and the control loop calculates and determines a modulation voltage value for the DC energy storage valve, thereby achieving active suppression of the multi-order harmonic current components in the DC circuit of the DC energy storage valve from the DC side.

[0008] In an optional embodiment, generating a harmonic compensation amount based on the multi-order harmonic current components includes: generating a first voltage compensation amount based on the multi-order harmonic current components and a proportional coefficient; correspondingly, inputting the harmonic compensation amount into a DC energy storage valve control loop to determine a modulation voltage value of the DC energy storage valve includes: adjusting a reference voltage value of a voltage control loop input into the DC energy storage valve control loop based on the first voltage compensation amount to obtain a modified reference voltage value; and determining the modulation voltage value of the DC energy storage valve based on the modified reference voltage value and the DC energy storage valve control loop.

[0009] In an embodiment of the present application, multi-order harmonic suppression is performed in a voltage control loop, a first voltage compensation amount is generated based on the multi-order harmonic current components and a proportional coefficient, a reference voltage value of the voltage control loop is adjusted based on the first voltage compensation amount, and a DC energy storage valve control loop determines a modulation voltage value of the DC energy storage valve based on the modified reference voltage value, thereby achieving multi-order harmonic suppression.

[0010] In an optional embodiment, generating a harmonic compensation amount based on the multi-order harmonic current components includes: using the multi-order harmonic current components as current compensation amounts; the current compensation amount is the harmonic compensation amount; accordingly, inputting the harmonic compensation amount into a DC energy storage valve control loop to determine a modulation voltage value of the DC energy storage valve includes: adjusting a reference current value of a current control loop input into the DC energy storage valve control loop according to the current compensation amount to obtain a modified reference current value; and determining the modulation voltage value of the DC energy storage valve based on the modified reference current value and the DC energy storage valve control loop.

[0011] In an embodiment of the present application, multi-order harmonic current components are used as current compensation amounts, and the reference current value of the current control loop is adjusted according to the current compensation amounts. The DC energy storage valve control loop determines the modulation voltage value of the DC energy storage valve based on the modified reference current value, thereby achieving multi-order harmonic suppression.

[0012] In an optional embodiment, generating a harmonic compensation amount based on the multi-order harmonic current component includes: inputting the multi-order harmonic current component and a multi-order harmonic current component reference value into a regulator to obtain a second voltage compensation amount; correspondingly, inputting the harmonic compensation amount into a DC energy storage valve control loop to determine a modulation voltage value of the DC energy storage valve includes: adjusting a modulation voltage value output by a current control loop in the DC energy storage valve control loop according to the second voltage compensation amount to obtain the modulation voltage value of the DC energy storage valve.

[0013] In an embodiment of the present application, the multi-order harmonic current component and the multi-order harmonic current component reference value are input into the regulator to obtain a second voltage compensation amount, and the modulation voltage value output by the current control loop is adjusted according to the second voltage compensation amount, and the multi-order harmonic current component is suppressed at the modulation voltage value of the DC energy storage valve control loop.

[0014] In an optional embodiment, the regulator is a proportional regulator, and the multi-order harmonic current component and the multi-order harmonic current component reference value are input into the regulator to obtain a second voltage compensation amount, including: determining the second voltage compensation amount based on the proportional coefficient of the proportional regulator, the multi-order harmonic current component and the multi-order harmonic current component reference value.

[0015] In the embodiment of the present application, the regulator is set to be a proportional regulator, and the second voltage compensation amount is determined by the proportional regulator. The proportional regulator has the advantage of fast regulation speed.

[0016] In an optional embodiment, the regulator is a proportional-integral regulator, and the multi-order harmonic current component and the multi-order harmonic current component reference value are input into the regulator to obtain a second voltage compensation amount, including: determining the second voltage compensation amount based on the proportional coefficient, integral coefficient, the multi-order harmonic current component and the multi-order harmonic current component reference value of the proportional regulator.

[0017] In the embodiment of the present application, the regulator is set to a proportional-integral regulator, and the second voltage compensation amount is determined by the proportional-integral regulator. The proportional-integral regulator has the advantages of high regulation accuracy and high stability.

[0018] In an optional embodiment, determining the multi-order harmonic current components based on the output current includes: obtaining a passable frequency band of a bandpass filter; wherein the passable frequency band of the bandpass filter is n times the operating frequency of the output current; and inputting the output current into the bandpass filter to obtain the multi-order harmonic current components output by the bandpass filter.

[0019] In the embodiment of the present application, by obtaining the passable frequency band of the bandpass filter, adjusting the allowed pass frequency band of the bandpass filter, and filtering the output current, harmonic current components of different orders can be obtained, thereby achieving suppression of harmonic components of different orders, which is more applicable.

[0020] In a second aspect, the present application provides a harmonic current suppression device, comprising: an acquisition module for acquiring the output current on a DC line of a DC energy storage valve; a first determination module for determining multi-order harmonic current components based on the output current; a second determination module for generating a harmonic compensation amount based on the multi-order harmonic current components; a control module for storing a DC energy storage valve control loop; and a third determination module for inputting the harmonic compensation amount into the control module to determine a modulation voltage value of the DC energy storage valve.

[0021] In an optional embodiment, the second determination module is specifically configured to generate a first voltage compensation amount based on the multi-order harmonic current component and the proportional coefficient; the third determination module is specifically configured to adjust a reference voltage value of a voltage control loop input into the DC energy storage valve control loop based on the first voltage compensation amount to obtain a modified reference voltage value; and determine a modulation voltage value of the DC energy storage valve based on the modified reference voltage value and the DC energy storage valve control loop.

[0022] In an optional embodiment, the second determination module is specifically configured to use the multi-order harmonic current component as a current compensation amount; the third determination module is specifically configured to adjust a reference current value of a current control loop input into the DC energy storage valve control loop according to the current compensation amount to obtain a modified reference current value; and determine a modulation voltage value of the DC energy storage valve based on the modified reference current value and the DC energy storage valve control loop.

[0023] In an optional embodiment, the second determination module is specifically configured to input the multi-order harmonic current component and the multi-order harmonic current component reference value into a regulator to obtain a second voltage compensation amount; and the third determination module is specifically configured to adjust the modulation voltage value output by the current control loop in the DC energy storage valve control loop according to the second voltage compensation amount to obtain the modulation voltage value of the DC energy storage valve.

[0024] In an optional embodiment, the regulator is a proportional regulator, and the second determination module is specifically configured to determine the second voltage compensation amount according to a proportional coefficient of the proportional regulator, the multi-order harmonic current component, and a reference value of the multi-order harmonic current component.

[0025] In an optional embodiment, the regulator is a proportional regulator, and the second determination module is specifically used to determine the second voltage compensation amount according to the proportional coefficient, integral coefficient, multi-order harmonic current component and the multi-order harmonic current component reference value of the proportional regulator.

[0026] In an optional embodiment, the first determination module is specifically used to obtain a passable frequency band of the bandpass filter; wherein the passable frequency band of the bandpass filter is n times the operating frequency of the output current; the output current is input into the bandpass filter to obtain multi-order harmonic current components output by the bandpass filter.

[0027] In a third aspect, the present application provides an electronic device comprising: a processor, a memory and a bus; the processor and the memory communicate with each other through the bus; the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute a method as described in any one of the aforementioned embodiments.

[0028] In a fourth aspect, the present application provides a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are read and executed by a computer, the method as described in any one of the aforementioned embodiments is executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application, and other related drawings can also be obtained based on these drawings.

[0030] FIG1 is a flow chart of a harmonic current suppression method provided by an embodiment of the present application;

[0031] FIG2 is an equivalent circuit diagram of a DC energy storage valve provided in an embodiment of the present application;

[0032] FIG3 is a schematic diagram of a DC energy storage valve control loop provided in an embodiment of the present application;

[0033] FIG4 is a schematic diagram of a first method for suppressing harmonic currents provided by an embodiment of the present application;

[0034] FIG5 is a schematic diagram of a second method for suppressing harmonic currents provided by an embodiment of the present application;

[0035] FIG6 is a schematic diagram of a third method for suppressing harmonic currents provided by an embodiment of the present application;

[0036] FIG7 is a structural block diagram of a harmonic current suppression device provided in an embodiment of the present application;

[0037] FIG8 is a schematic structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0039] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. At the same time, in the description of this application, relational terms such as "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements that are not clearly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "comprise a..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0040] Furthermore, the term "and / or" in this application is merely a description of an association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The term "plurality" refers to two or more (including two).

[0041] The high-voltage direct-mounted energy storage valve (hereinafter referred to as the DC energy storage valve) has a highly modular structure that can meet the requirements of high efficiency, high reliability, economy and safety. When the DC energy storage valve is connected to the AC system through a converter, the AC side will generate multi-order harmonic current components on the DC side under asymmetric fault conditions. The multi-order harmonic current components will impact the batteries in the DC energy storage valve, thereby reducing the life of the battery. At present, the solution for suppressing multi-order harmonic currents is usually implemented on the AC system side. Since the AC system side involves multi-phase voltages, there is a problem of complex suppression strategy in the process of suppressing multi-order harmonic currents on the AC system side, and it cannot be directly applied to the control strategy of the DC energy storage valve.

[0042] In an embodiment of the present application, the output current of a DC circuit of a DC energy storage valve is obtained, and multi-order harmonic current components in the output current are determined based on the obtained output current. A harmonic compensation value is generated based on the multi-order harmonic current components to suppress the multi-order harmonic current components in the DC circuit. The harmonic compensation value is input into a control loop of the DC energy storage valve, and the control loop calculates and determines a modulation voltage value for the DC energy storage valve, thereby achieving active suppression of the multi-order harmonic current components in the DC circuit of the DC energy storage valve from the DC side.

[0043] The harmonic current suppression method provided in the embodiments of the present application is used to suppress harmonic currents in a DC energy storage valve. The DC energy storage valve can be installed in various energy storage systems, including but not limited to: energy storage power supply systems such as hydropower, thermal power, wind power, and solar power stations; energy storage systems for electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles; and energy storage systems in various fields such as military equipment and aerospace.

[0044] Please refer to FIG1 , which is a flow chart of a harmonic current suppression method provided in an embodiment of the present application. The harmonic current suppression method may include the following steps:

[0045] S1: Obtain the output current on the DC line of the DC energy storage valve.

[0046] In the embodiments of the present application, the DC energy storage valve is connected to a converter. The converter converts the DC power output by the DC energy storage valve into AC power and inputs it to the AC side, or converts the AC power output from the AC side into DC power and inputs it to the DC side of the DC energy storage valve. The output current on the DC circuit of the DC energy storage valve is the current on the DC circuit between the DC energy storage valve and the converter.

[0047] In the event of an asymmetric fault condition on the AC side, such as a single-phase ground fault, a two-phase ground fault, or a two-phase short circuit, a negative sequence component appears on the AC side, generating multi-order harmonic components between the AC phases. Accordingly, the output current on the DC line of the DC energy storage valve will include multi-order harmonic currents. Multi-order harmonic currents can include harmonic currents of different orders, such as double frequency current and triple frequency current. The frequency of the double frequency current is twice the power frequency. For example, if the power frequency is 50Hz, the frequency of the double frequency current is 100Hz, and the frequency of the triple frequency current is 150Hz.

[0048] In some embodiments, the output current on the DC circuit of the DC energy storage valve can be determined by measuring a device capable of measuring current, such as an ammeter or current meter, provided on the DC circuit of the DC energy storage valve.

[0049] In other embodiments, a management module is provided in the DC energy storage valve, and the management module can detect the current output on the DC circuit of the DC energy storage valve in real time. The output current is the output current on the DC circuit of the DC energy storage valve.

[0050] S2: Determine the multi-order harmonic current components based on the output current.

[0051] In the embodiment of the present application, after obtaining the output current of the DC circuit of the DC energy storage valve, the output current is filtered to determine the multi-order harmonic current components in the output current. The multi-order harmonic current components are the current values ​​of the multi-order harmonic currents included in the output current.

[0052] As an optional implementation, the above step S2 may include the following steps:

[0053] Obtain a passable frequency band of the bandpass filter; wherein the passable frequency band of the bandpass filter is n times the operating frequency of the output current; input the output current into the bandpass filter to obtain multi-order harmonic current components output by the bandpass filter.

[0054] In an embodiment of the present application, the output current is filtered by a bandpass filter to obtain multi-order harmonic current components in the output current. Since the multi-order harmonic current includes harmonic currents of different orders such as double frequency current and triple frequency current, in the process of harmonic current suppression, the passable frequency set by the user can be first received, and the passable frequency band can be set to n times the operating frequency of the output current, where n can be a positive integer greater than 1 or a decimal less than 1. That is, the passable frequency band can be an integer multiple or decimal multiple of the operating frequency of the output current. The passable frequency band of the bandpass filter is set to the passable frequency set by the user, so that the bandpass filter can filter the output current to obtain harmonic current components of the corresponding order.

[0055] For example, if harmonic suppression of double-frequency current is required, the frequency can be set to twice the operating frequency. The bandpass filter filters the output current and outputs the double-frequency current component. If harmonic suppression of triple-frequency current is required, the frequency can be set to three times the operating frequency. The bandpass filter filters the output current and outputs the triple-frequency current component.

[0056] By obtaining the passable frequency band of the band-pass filter, adjusting the allowed passable frequency band of the band-pass filter, and filtering the output current, harmonic current components of different orders can be obtained, thereby suppressing harmonic components of different orders, which is more applicable.

[0057] In addition, the present application does not limit the specific method of determining the multi-order harmonic current components based on the output current. In addition to using the bandpass filter in the above embodiment, other devices, such as capacitors, inductors and other circuit components, can also be used to filter the output current to obtain multi-order harmonic current components.

[0058] S3: Generate harmonic compensation based on multi-order harmonic current components.

[0059] S4: Input the harmonic compensation amount into the DC energy storage valve control loop to determine the modulation voltage value of the DC energy storage valve.

[0060] In some embodiments, a DC energy storage valve includes a valve base controller (VBC) and multiple submodules. The valve base controller is connected to the multiple submodules. The valve base controller serves as the executor of the harmonic current suppression method provided in the embodiments of the present application. The valve base controller determines a modulation voltage value based on the harmonic current suppression method and controls the submodules to output the corresponding modulation voltage.

[0061] For ease of understanding, steps S3 and S4 are described together below.

[0062] In the embodiment of the present application, the harmonic compensation amount is used to suppress multi-order harmonic current components in the DC line. After determining the multi-order harmonic current components in step S2, a harmonic compensation amount is generated based on the multi-order harmonic current components and input into the DC energy storage valve control loop to achieve active suppression of the multi-order harmonic current components in the DC line of the DC energy storage valve.

[0063] The equivalent circuit of the DC energy storage valve is shown in Figure 2. The DC energy storage valve is connected to the voltage source converter (VSC). The DC voltage output by the DC energy storage valve is u c , the output current value of the DC energy storage valve is i dc , the DC voltage at the connection between the DC system and the converter is u dc , the DC circuit impedance is Z dclink .

[0064] As an optional embodiment, the DC energy storage valve control loop includes a voltage control loop and a current control loop. The voltage control loop is used to determine a reference current value based on the DC voltage value of the DC energy storage valve and a reference voltage value. The current control loop is used to determine a modulation voltage value of the DC energy storage valve based on the output current value of the DC energy storage valve and the reference current value.

[0065] In the embodiment of the present application, the DC energy storage valve control loop is shown in FIG3 , and the working principle of the voltage control loop is: the reference voltage value u dc,ref with u dcThe voltage error is obtained by subtracting the voltage error and inputting the voltage error into a proportional-integral regulator. The proportional-integral regulator is based on the voltage control loop transfer function G vPI Output reference current value i dc,ref . Reference voltage value u dc,ref It is the voltage value that the DC energy storage valve should output in the current working state.

[0066] The working principle of the current control loop is: the reference current value i output by the voltage control loop is dc,ref The output current value i of the DC energy storage valve dc The current error is obtained by subtracting the current error and inputting the current error into a proportional-integral regulator. The proportional-integral regulator is based on the current control loop transfer function G iPI Output modulation voltage value u of DC energy storage valve dc,cm .

[0067] The three harmonic current suppression strategies provided in this application input the harmonic compensation amount into the reference voltage value, reference current value and modulation voltage value of the DC energy storage valve control loop to achieve harmonic current suppression.

[0068] As can be seen from the aforementioned introduction to multi-order harmonic currents, multi-order harmonic currents can include harmonic currents of different orders, such as double-frequency current and triple-frequency current. The methods for suppressing harmonic currents of different orders, such as double-frequency current and triple-frequency current, are the same. The following uses harmonic suppression of double-frequency current as an example to illustrate the three harmonic current suppression strategies provided in this application.

[0069] In the first implementation, a first voltage compensation amount is generated based on the multi-order harmonic current components and the proportional coefficient; the reference voltage value of the voltage control loop is adjusted based on the first voltage compensation amount to obtain a modified reference voltage value; and the modulation voltage value of the DC energy storage valve is determined based on the modified reference voltage value and the DC energy storage valve control loop.

[0070] In this embodiment, as shown in FIG4 , the output current of the DC energy storage valve is filtered by a bandpass filter to obtain a double frequency current component i dc2 . The double frequency current component i dc2 and the proportional coefficient G i2 Multiply them to get the first voltage compensation u1 (i.e. harmonic compensation). dc,ref Subtract the first voltage compensation value u1 to obtain the modified reference voltage value u dc,ref -u1. The DC energy storage valve control loop determines the modulation voltage value of the DC energy storage valve according to the modified reference voltage value.

[0071] Specifically, the voltage control loop of the DC energy storage valve control loop changes the modified reference voltage value u dc,refnewand the DC voltage u of the DC energy storage valve dc The voltage error is obtained by subtracting the voltage error and inputting the voltage error into a proportional-integral regulator to determine the reference current value i dc,ref The current control loop converts the reference current value i output by the voltage control loop into dc,ref The output current value i of the DC energy storage valve dc The current error is obtained by the difference, and the current error is input into a proportional-integral regulator to determine the modulation voltage value u of the DC energy storage valve. dc,cm .

[0072] Proportional coefficient G i2 The value of can be an empirical value or a suitable value determined through a large number of experiments. The experimental process is: set different proportional coefficients, compare the proportion of the double frequency current to the DC current in the output current of the DC energy storage valve under different proportional coefficients, and thus determine the proportional coefficient G corresponding to the minimum proportion of the double frequency current to the DC current. i2 .

[0073] In the above manner, a first voltage compensation amount is generated based on the multi-order harmonic current components and the proportional coefficient, the reference voltage value of the voltage control loop is adjusted based on the first voltage compensation amount, and the DC energy storage valve control loop determines the modulation voltage value of the DC energy storage valve based on the modified reference voltage value, thereby achieving multi-order harmonic suppression.

[0074] In the second implementation mode, the multi-order harmonic current components are used as current compensation amounts; the reference current value of the current control loop is adjusted according to the current compensation amount to obtain a modified reference current value; and the modulation voltage value of the DC energy storage valve is determined based on the modified reference current value and the DC energy storage valve control loop.

[0075] In this embodiment, as shown in FIG5 , the output current of the DC energy storage valve is filtered by a bandpass filter to obtain a double frequency current component i dc2 The double frequency current component i dc2 As the harmonic current compensation amount (i.e. harmonic compensation amount), the reference current value i dc,ref and the double frequency current component i dc2 Make the difference and get the modified reference current value i dc,ref -i dc2 The DC energy storage valve control loop determines the modulation voltage value of the DC energy storage valve according to the modified reference voltage value.

[0076] Specifically, in this embodiment, the processing of the voltage control loop of the DC energy storage valve control loop is not changed. The working mode of the voltage control loop can refer to the description in the above embodiment and will not be repeated here. The voltage control loop outputs a reference current i dc,ref Then, according to the double frequency current component idc2 For the reference current i dc,ref Adjust the reference current i dc,ref Modify to the reference current value i dc,ref -i dc2 , the current control loop is based on the modified reference current value i dc,ref -i dc2 The output current value i of the DC energy storage valve dc The current error is obtained by subtracting the current error, and the current error is input into a proportional-integral regulator to determine the modulation voltage value u of the DC energy storage valve. dc,cm .

[0077] In the above manner, the multi-order harmonic current components are used as current compensation amounts, and the reference current value of the current control loop is adjusted according to the current compensation amounts. The DC energy storage valve control loop determines the modulation voltage value of the DC energy storage valve based on the modified reference current value, thereby achieving multi-order harmonic suppression.

[0078] In the third implementation mode, the multi-order harmonic current component and the multi-order harmonic current component reference value are input into the regulator to obtain a second voltage compensation amount; the modulation voltage value output by the current control loop is adjusted according to the second voltage compensation amount to obtain the modulation voltage value of the DC energy storage valve.

[0079] In this embodiment, a regulator is provided that determines a second voltage compensation value based on the multi-order harmonic current components and a multi-order harmonic current component reference value. The second voltage compensation value is input to the modulation voltage value of the DC energy storage valve control loop, thereby adjusting the modulation voltage value output by the current control loop, thereby achieving harmonic current suppression.

[0080] In some embodiments, the regulator may be a proportional regulator, and the second voltage compensation amount is determined according to a proportional coefficient of the proportional regulator, the multi-order harmonic current component, and a multi-order harmonic current component reference value.

[0081] The second compensation amount can be determined by the following formula:

[0082] u2=k p (i dcnref -i dcn );

[0083] Among them, u2 is the second voltage compensation amount, i dcnref is the reference value of multi-order harmonic current components, i dcn is the multi-order harmonic current component, k p is the proportional coefficient of the proportional regulator. In order to suppress the multi-order harmonic components, the multi-order harmonic current component reference value i dc2ref Set to 0.

[0084] In other embodiments, the regulator may be a proportional-integral regulator, and the second voltage compensation amount is determined according to a proportional coefficient of the proportional regulator, the multi-order harmonic current components, and a multi-order harmonic current component reference value.

[0085] The second voltage compensation amount can be determined by the following formula:

[0086] u2=k p (i dcnref -i dcn )+k i ∫(i dcnref -i dcn )dt;

[0087] Among them, u2 is the second voltage compensation amount, i dcnref is the reference value of multi-order harmonic current components, i dcn is the multi-order harmonic current component, k p is the proportional coefficient of the proportional-integral regulator, k i is the integral coefficient of the proportional-integral regulator. In order to suppress the multi-order harmonic components, the multi-order harmonic current component reference value i dc2ref Set to 0.

[0088] As shown in Figure 6, when the double frequency current is suppressed, i dcnref and i dcn The n in the equation is 2, that is, the reference value of the double frequency current component is i dc2ref , the double frequency current component is i dc2 After filtering the output current of the DC energy storage valve through a bandpass filter, the double frequency current component i dc2 . The double frequency current component i dc2 and the double frequency current component reference value i dc2ref The double frequency current error is input into the proportional-integral regulator, and the proportional-integral regulator calculates and determines the second voltage compensation amount u2 according to the above formula.

[0089] This embodiment does not change the processing of the voltage control loop and the current control loop of the DC energy storage valve control loop. The working methods of the voltage control loop and the current control loop can refer to the description of the previous embodiment and will not be repeated here. The current control loop outputs the modulation voltage u dc,cm Then, the modulation voltage u output by the current control loop is adjusted according to the second voltage compensation u2. dc,cm Adjustment is done by adjusting the modulation voltage u output by the current control loop. dc,cm Added to the second voltage compensation amount u2, the modulation voltage value of the DC energy storage valve is obtained.

[0090] In the above manner, the multi-order harmonic current component and the multi-order harmonic current component reference value are input into the regulator to obtain a second voltage compensation amount. The modulation voltage value output by the current control loop is adjusted according to the second voltage compensation amount, and the multi-order harmonic current component is suppressed at the modulation voltage value of the DC energy storage valve control loop.

[0091] The present application also provides a harmonic current suppression device. Referring to FIG. 7 , FIG. 7 is a block diagram of a harmonic current suppression device provided in an embodiment of the present application. The harmonic current suppression device 700 includes: an acquisition module 701 for acquiring the output current on the DC line of a DC energy storage valve; a first determination module 702 for determining multi-order harmonic current components based on the output current; a second determination module 703 for generating a harmonic compensation value based on the multi-order harmonic current components; a control module 704 for storing a DC energy storage valve control loop; and a third determination module 705 for inputting the harmonic compensation value into the control module to determine a modulation voltage value for the DC energy storage valve.

[0092] In an optional embodiment, the second determination module 703 is specifically configured to generate a first voltage compensation amount based on the multi-order harmonic current component and the proportional coefficient; the third determination module 705 is specifically configured to adjust a reference voltage value of a voltage control loop input into the DC energy storage valve control loop based on the first voltage compensation amount to obtain a modified reference voltage value; and determine a modulation voltage value of the DC energy storage valve based on the modified reference voltage value and the DC energy storage valve control loop.

[0093] In an optional embodiment, the second determination module 703 is specifically configured to use the multi-order harmonic current component as a current compensation amount; the third determination module 705 is specifically configured to adjust a reference current value of a current control loop input into the DC energy storage valve control loop according to the current compensation amount to obtain a modified reference current value; and determine a modulation voltage value of the DC energy storage valve based on the modified reference current value and the DC energy storage valve control loop.

[0094] In an optional embodiment, the second determination module 703 is specifically used to input the multi-order harmonic current component and the multi-order harmonic current component reference value into the regulator to obtain a second voltage compensation amount; the third determination module 705 is specifically used to adjust the modulation voltage value output by the current control loop in the DC energy storage valve control loop according to the second voltage compensation amount to obtain the modulation voltage value of the DC energy storage valve.

[0095] In an optional embodiment, the regulator is a proportional regulator, and the second determination module 703 is specifically configured to determine the second voltage compensation amount according to a proportional coefficient of the proportional regulator, the multi-order harmonic current component, and the multi-order harmonic current component reference value.

[0096] In an optional embodiment, the regulator is a proportional regulator, and the second determination module 703 is specifically used to determine the second voltage compensation amount according to the proportional coefficient, integral coefficient, multi-order harmonic current component and the multi-order harmonic current component reference value of the proportional regulator.

[0097] In an optional embodiment, the first determination module 702 is specifically used to obtain a passable frequency band of the bandpass filter; wherein the passable frequency band of the bandpass filter is n times the operating frequency of the output current; the output current is input into the bandpass filter to obtain multi-order harmonic current components output by the bandpass filter.

[0098] Please refer to Figure 8, which is a schematic diagram of the structure of an electronic device according to an embodiment of the present application. The electronic device 800 includes: at least one processor 801, at least one communication interface 802, at least one memory 803, and at least one bus 804. The bus 804 is used to enable direct communication between these components, the communication interface 802 is used to communicate signaling or data with other node devices, and the memory 803 stores machine-readable instructions executable by the processor 801. When the electronic device 800 is running, the processor 801 communicates with the memory 803 via the bus 804, and when the machine-readable instructions are called by the processor 801, the harmonic current suppression method described above is executed.

[0099] The processor 801 can be an integrated circuit chip with signal processing capabilities. The above-mentioned processor 801 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0100] The memory 803 may include but is not limited to random access memory (RAM), read only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc.

[0101] It will be understood that the structure shown in FIG8 is for illustration only, and the electronic device 800 may also include more or fewer components than those shown in FIG8 , or have a configuration different from that shown in FIG8 . The components shown in FIG8 may be implemented using hardware, software, or a combination thereof. In an embodiment of the present application, the electronic device 800 may be a device for controlling the voltage output by a DC energy storage valve, and may specifically be a physical device such as a desktop computer, a laptop computer, a smart phone, a smart wearable device, an in-vehicle device, or a virtual device such as a virtual machine. In addition, the electronic device 800 is not necessarily a single device, but may also be a combination of multiple devices, such as a server cluster, etc.

[0102] In addition, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a computer, the steps of the harmonic current suppression method in the above embodiment are executed.

[0103] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0104] In addition, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0105] Furthermore, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0106] It should be noted that if the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0107] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for suppressing harmonic currents, comprising: obtaining an output current on a DC line of the DC energy storage valve; determining multi-order harmonic current components according to the output current; generating a harmonic compensation amount based on the multi-order harmonic current components; The harmonic compensation amount is input into a DC energy storage valve control loop to determine a modulation voltage value of the DC energy storage valve.

2. The harmonic current suppression method according to claim 1, wherein: Generating a harmonic compensation amount based on the multi-order harmonic current components includes: generating a first voltage compensation amount according to the multi-order harmonic current components and a proportional coefficient; Accordingly, inputting the harmonic compensation amount into a DC energy storage valve control loop to determine a modulation voltage value of the DC energy storage valve includes: adjusting a reference voltage value of a voltage control loop input into the DC energy storage valve control loop according to the first voltage compensation amount to obtain a modified reference voltage value; A modulation voltage value of the DC energy storage valve is determined based on the modified reference voltage value and the DC energy storage valve control loop.

3. The harmonic current suppression method according to claim 1, wherein: Generating a harmonic compensation amount based on the multi-order harmonic current components includes: Using the multi-order harmonic current components as current compensation; the current compensation is the harmonic compensation; Accordingly, inputting the harmonic compensation amount into a DC energy storage valve control loop to determine a modulation voltage value of the DC energy storage valve includes: adjusting a reference current value of a current control loop input into the DC energy storage valve control loop according to the current compensation amount to obtain a modified reference current value; A modulation voltage value of the DC energy storage valve is determined based on the modified reference current value and the DC energy storage valve control loop.

4. The harmonic current suppression method according to claim 1, wherein: Generating a harmonic compensation amount based on the multi-order harmonic current components includes: Inputting the multi-order harmonic current component and the multi-order harmonic current component reference value into a regulator to obtain a second voltage compensation amount; Accordingly, inputting the harmonic compensation amount into a DC energy storage valve control loop to determine a modulation voltage value of the DC energy storage valve includes: The modulation voltage value output by the current control loop in the DC energy storage valve control loop is adjusted according to the second voltage compensation amount to obtain the modulation voltage value of the DC energy storage valve.

5. The harmonic current suppression method according to claim 4, wherein: The regulator is a proportional regulator, and the multi-order harmonic current component and the multi-order harmonic current component reference value are input into the regulator to obtain the second voltage compensation amount, including: The second voltage compensation amount is determined according to a proportional coefficient of the proportional regulator, the multi-order harmonic current component, and a multi-order harmonic current component reference value.

6. The harmonic current suppression method according to claim 4, wherein: The regulator is a proportional-integral regulator, and the multi-order harmonic current component and the multi-order harmonic current component reference value are input into the regulator to obtain the second voltage compensation amount, including: The second voltage compensation amount is determined according to a proportional coefficient, an integral coefficient, the multi-order harmonic current component, and a reference value of the multi-order harmonic current component of the proportional regulator.

7. The harmonic current suppression method according to any one of claims 1 to 6, wherein: The determining of multi-order harmonic current components according to the output current includes: Obtaining a passable frequency band of a bandpass filter; wherein the passable frequency band of the bandpass filter is n times the operating frequency of the output current; The output current is input into the band-pass filter to obtain multi-order harmonic current components output by the band-pass filter.

8. A harmonic current suppression device, comprising: An acquisition module, used for acquiring an output current on a DC line of a DC energy storage valve; A first determining module, configured to determine multi-order harmonic current components according to the output current; A second determining module is configured to generate a harmonic compensation amount based on the multi-order harmonic current components; A control module for storing a DC energy storage valve control loop; The third determining module is configured to input the harmonic compensation amount into the control module to determine a modulation voltage value of the DC energy storage valve.

9. An electronic device comprising: processor, memory, and bus; The processor and the memory communicate with each other via the bus; The memory stores program instructions that can be executed by the processor, and the processor can execute the method according to any one of claims 1 to 7 by calling the program instructions.

10. A computer-readable storage medium having computer program instructions stored thereon, wherein the computer program instructions, when read and executed by a computer, execute the method according to any one of claims 1 to 7.

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