A harmonic suppression method, device, equipment and storage medium

Abstract

The present invention discloses a harmonic suppression method, device, equipment and storage medium. By setting a harmonic voltage droop control strategy, a first relationship between harmonic power and harmonic impedance is determined; based on the first relationship, the actual harmonic power in the power grid is converted into a first harmonic impedance, and based on the first harmonic impedance and the harmonic voltage droop control strategy, the harmonic voltage value of a target feeder in the power grid is calculated; it is judged whether the harmonic voltage value satisfies multiple harmonic power balances, and when it is determined that multiple harmonic power balances are satisfied, the harmonic power balance impedance values ​​of each feeder are obtained, and the multiple harmonic impedances of the target feeder are obtained at the same time, and the compensation impedance is calculated according to the harmonic impedance and the harmonic power balance impedance values ​​of each feeder, and the harmonic impedance of the target feeder is compensated based on the compensation impedance; compared with the prior art, the technical solution of the present invention can improve the overall harmonic suppression level of the power grid and ensure the stable operation and quality of the power system.

Description

Technical Field

[0001] The present invention relates to the technical field of power system operation and control, and in particular to a harmonic suppression method, device, equipment and storage medium. Background Art

[0002] Building a new power system with new energy as the main body is a national key development strategy to promote the development and utilization of new energy in my country and promote the adjustment of my country's energy structure. The large-scale access of new energy brings more uncertainty and randomness to the power grid. Power quality problems such as medium and high frequency harmonics and wide frequency oscillation in the power grid are becoming more and more frequent. Harmonics have many hazards to the new power system, such as reducing line transmission capacity, causing transformer heating or even burning.

[0003] At present, harmonic control mainly follows the principle of "whoever pollutes, whoever controls". Although this principle defines the investment subject from an economic perspective, it is more about considering the problem from a local perspective. For example, when a user is regarded as a harmonic source, the user can be required to install SVG (static VAR generator), passive filtering and other equipment to suppress harmonics, but this method can only solve local problems. There is a direct or indirect connection between the various parts of the power grid. Although local harmonics can be suppressed, due to the imbalance of harmonic power, it will still cause line harmonics to exceed the standard. Therefore, there is an urgent need for a harmonic suppression method to improve the existing problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a harmonic suppression method, device, equipment and storage medium to improve the overall harmonic suppression level of the power grid.

[0005] In order to solve the above technical problems, the present invention provides a harmonic suppression method, comprising:

[0006] Setting a harmonic voltage droop control strategy to determine a first relationship between harmonic power and harmonic impedance;

[0007] Acquire actual harmonic power in the power grid, convert the actual harmonic power into a first harmonic impedance based on the first relationship, and calculate a harmonic voltage value of a target feeder in the power grid based on the first harmonic impedance and the harmonic voltage droop control strategy;

[0008] Determining whether the harmonic voltage value satisfies multiple harmonic power balance, and if not, adjusting the first harmonic impedance to update the harmonic voltage value until it is determined based on the harmonic voltage value that multiple harmonic power balance is satisfied;

[0009] When it is determined that multiple harmonic power balance is satisfied, the harmonic power balance impedance value of each feeder is obtained, and the multiple harmonic impedances of the target feeder are obtained at the same time. The compensation impedance is calculated according to the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder, and the harmonic impedance of the target feeder is compensated based on the compensation impedance.

[0010] In a possible implementation, a harmonic voltage droop control strategy is set, wherein the harmonic voltage droop control strategy is as follows:

[0011]

[0012] Where V H,n is the Hth harmonic voltage value of the nth feeder, is the rated value of the Hth harmonic voltage of the nth feeder, m is the droop control parameter, S d HR,n is the actual harmonic power.

[0013] In a possible implementation manner, determining a first relationship between harmonic power and harmonic impedance specifically includes:

[0014] When the harmonic power in the feeder is balanced, the harmonic impedance of the feeder and the rated harmonic power of the load are obtained to calculate the balance factor;

[0015] Based on the balance factor, a first relationship between harmonic power and harmonic impedance is determined, wherein the first relationship is as follows:

[0016] S HR,n =K / X H,n ;

[0017] In the formula, S HR,n is the harmonic power of the nth feeder, K is the balance factor, X H,n is the harmonic impedance of the nth feeder.

[0018] In a possible implementation manner, calculating the harmonic voltage value of a target feeder in a power grid based on the first harmonic impedance and the harmonic voltage droop control strategy specifically includes:

[0019] Based on the first relationship, updating the harmonic voltage droop control strategy to obtain a first harmonic voltage droop control strategy;

[0020] Substituting the first harmonic impedance into the first harmonic voltage droop control strategy to calculate the harmonic voltage value of the target feeder in the power grid;

[0021] The first harmonic voltage droop control strategy is as follows:

[0022]

[0023] In a possible implementation manner, before determining whether the harmonic voltage value satisfies multiple harmonic power balance, the method further includes:

[0024] Acquire multiple harmonic inductances of the target feeder, and calculate each harmonic impedance of the target feeder based on the multiple harmonic inductances;

[0025] Simultaneously acquiring the fundamental frequency negative sequence impedance of the target feeder, and determining a second relationship between the harmonic impedance and the fundamental frequency negative sequence impedance and the harmonic impedance based on the fundamental frequency negative sequence impedance and the harmonic impedance;

[0026] And based on the second relationship, the first harmonic voltage droop control strategy is updated to obtain a second harmonic voltage droop control strategy.

[0027] In a possible implementation, determining whether the harmonic voltage value satisfies multiple harmonic power balance specifically includes:

[0028] Substitute the harmonic voltage value into the second harmonic voltage droop control strategy to determine whether the harmonic voltage value satisfies the second harmonic voltage droop control strategy; if so, determine that the harmonic voltage value satisfies multiple harmonic power balance; otherwise, determine that the harmonic voltage value does not satisfy multiple harmonic power balance.

[0029] In a possible implementation, calculating the compensation impedance according to the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder line specifically includes:

[0030] Substitute the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder into a preset compensation impedance calculation formula to calculate the compensation impedance, wherein the compensation impedance calculation formula is as follows:

[0031] HX2=HωL H,n -HX1;

[0032] In the formula, HX2 is the compensation impedance, H is the harmonic order, ω is the angular frequency, L H,n is the Hth harmonic inductance of the nth feeder line, and HX1 is the multiple harmonic impedance.

[0033] The present invention also provides a harmonic suppression device, comprising: a harmonic voltage droop control strategy setting module, a harmonic voltage value calculation module, a harmonic power balance judgment module and a compensation impedance calculation module;

[0034] Wherein, the harmonic voltage droop control strategy setting module is used to set the harmonic voltage droop control strategy and determine the first relationship between the harmonic power and the harmonic impedance;

[0035] The harmonic voltage value calculation module is used to obtain actual harmonic power in the power grid, convert the actual harmonic power into a first harmonic impedance based on the first relationship, and calculate the harmonic voltage value of a target feeder in the power grid based on the first harmonic impedance and the harmonic voltage droop control strategy;

[0036] The harmonic power balance judgment module is used to judge whether the harmonic voltage value satisfies multiple harmonic power balance, and if not, adjust the first harmonic impedance to update the harmonic voltage value until it is judged based on the harmonic voltage value that multiple harmonic power balance is satisfied;

[0037] The compensation impedance calculation module is used to obtain the harmonic power balance impedance value of each feeder when it is determined that the multiple harmonic power balance is satisfied, and simultaneously obtain the multiple harmonic impedances of the target feeder, calculate the compensation impedance according to the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder, and compensate the harmonic impedance of the target feeder based on the compensation impedance.

[0038] In a possible implementation, the harmonic voltage droop control strategy setting module is used to set a harmonic voltage droop control strategy, wherein the harmonic voltage droop control strategy is as follows:

[0039]

[0040] Where V H,n is the Hth harmonic voltage value of the nth feeder, is the rated value of the Hth harmonic voltage of the nth feeder, m is the droop control parameter, S d HR,n is the actual harmonic power.

[0041] In a possible implementation, the harmonic voltage droop control strategy setting module is used to determine a first relationship between harmonic power and harmonic impedance, specifically including:

[0042] When the harmonic power in the feeder is balanced, the harmonic impedance of the feeder and the rated harmonic power of the load are obtained to calculate the balance factor;

[0043] Based on the balance factor, a first relationship between harmonic power and harmonic impedance is determined, wherein the first relationship is as follows:

[0044] S HR,n =K / X H,n ;

[0045] In the formula, S HR,n is the harmonic power of the nth feeder, K is the balance factor, X H,n is the harmonic impedance of the nth feeder.

[0046] In a possible implementation, the harmonic voltage value calculation module is used to calculate the harmonic voltage value of the target feeder in the power grid based on the first harmonic impedance and the harmonic voltage droop control strategy, specifically including:

[0047] Based on the first relationship, updating the harmonic voltage droop control strategy to obtain a first harmonic voltage droop control strategy;

[0048] Substituting the first harmonic impedance into the first harmonic voltage droop control strategy to calculate the harmonic voltage value of the target feeder in the power grid;

[0049] The first harmonic voltage droop control strategy is as follows:

[0050]

[0051] In a possible implementation, the harmonic power balance judgment module is used to judge whether the harmonic voltage value satisfies multiple harmonic power balance, and further includes:

[0052] Acquire multiple harmonic inductances of the target feeder, and calculate each harmonic impedance of the target feeder based on the multiple harmonic inductances;

[0053] Simultaneously acquiring the fundamental frequency negative sequence impedance of the target feeder, and determining a second relationship between the harmonic impedance and the fundamental frequency negative sequence impedance and the harmonic impedance based on the fundamental frequency negative sequence impedance and the harmonic impedance;

[0054] And based on the second relationship, the first harmonic voltage droop control strategy is updated to obtain a second harmonic voltage droop control strategy.

[0055] In a possible implementation, the harmonic power balance judgment module is used to judge whether the harmonic voltage value satisfies multiple harmonic power balance, specifically including:

[0056] Substitute the harmonic voltage value into the second harmonic voltage droop control strategy to determine whether the harmonic voltage value satisfies the second harmonic voltage droop control strategy; if so, determine that the harmonic voltage value satisfies multiple harmonic power balance; otherwise, determine that the harmonic voltage value does not satisfy multiple harmonic power balance.

[0057] In a possible implementation, the compensation impedance calculation module is used to calculate the compensation impedance according to the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder line, specifically including:

[0058] Substitute the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder into a preset compensation impedance calculation formula to calculate the compensation impedance, wherein the compensation impedance calculation formula is as follows:

[0059] HX2=HωL H,n -HX1;

[0060] In the formula, HX2 is the compensation impedance, H is the harmonic order, ω is the angular frequency, L H,n is the Hth harmonic inductance of the nth feeder line, and HX1 is the multiple harmonic impedance.

[0061] The present invention also provides a terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the harmonic suppression method as described in any one of the above when executing the computer program.

[0062] The present invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute any of the harmonic suppression methods described above.

[0063] The harmonic suppression method, device, equipment and storage medium of the embodiment of the present invention have the following beneficial effects compared with the prior art:

[0064] The first relationship between harmonic power and harmonic impedance is determined by setting a harmonic voltage droop control strategy; the actual harmonic power in the power grid is obtained, and the actual harmonic power is converted into a first harmonic impedance based on the first relationship; the harmonic voltage value of the target feeder in the power grid is calculated based on the first harmonic impedance and the harmonic voltage droop control strategy; it is judged whether the harmonic voltage value satisfies multiple harmonic power balance, and if not, the first harmonic impedance is adjusted to update the harmonic voltage value until it is judged that multiple harmonic power balance is satisfied based on the harmonic voltage value; and when it is determined that multiple harmonic power balance is satisfied, the harmonic power balance impedance value of each feeder is obtained, and the multiple harmonic impedances of the target feeder are obtained at the same time, and the multiple harmonic impedances of the target feeder are calculated according to the multiple harmonic impedances and the harmonics of each feeder. power balance impedance value, calculate the compensation impedance, and compensate the harmonic impedance of the target feeder based on the compensation impedance; compared with the prior art, the technical solution of the present invention converts the actual harmonic power in the power grid into the first harmonic impedance based on the first relationship by setting a harmonic voltage droop control strategy, and can convert the actual power information into impedance information, which provides convenience for subsequent calculation and control. At the same time, according to whether the harmonic voltage value satisfies multiple harmonic power balance, the harmonic problems in the power grid can be discovered in time and corresponding measures can be taken. On the premise of satisfying multiple harmonic power balance, the compensation impedance is calculated and the harmonic impedance of the target feeder is compensated; it can effectively reduce harmonic voltage distortion, improve the harmonic characteristics of the power grid, and enhance the overall harmonic suppression level of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a flow chart of an embodiment of a harmonic suppression method provided by the present invention;

[0066] Figure 2 It is a structural schematic diagram of an embodiment of a harmonic suppression device provided by the present invention;

[0067] Figure 3 This is a schematic diagram of impedance before feeder compensation according to an embodiment of the present invention;

[0068] Figure 4 It is a schematic diagram of feeder series compensation according to an embodiment of the present invention. DETAILED DESCRIPTION

[0069] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0070] Example 1, see Figure 1 , Figure 1 : is a flow chart of an embodiment of a harmonic suppression method provided by the present invention, such as Figure 1 As shown, the method includes steps 101 to 104, which are specifically as follows:

[0071] Step 101: Setting a harmonic voltage droop control strategy to determine a first relationship between harmonic power and harmonic impedance.

[0072] In one embodiment, droop control is a simple and easy-to-implement control strategy, which is currently widely used in distributed microgrid voltage and frequency. In this embodiment, a harmonic voltage droop control strategy is set by referring to the droop control.

[0073] In one embodiment, a harmonic voltage droop control strategy is set, wherein the harmonic voltage droop control strategy is as follows:

[0074]

[0075] Where V H，n is the Hth harmonic voltage value of the nth feeder, is the rated value of the Hth harmonic voltage of the nth feeder, m is the droop control parameter, S d HR，n is the actual harmonic power.

[0076] Preferably, for Ideally, the harmonic voltage expected by the power grid system is as small as possible. In this embodiment, referring to GB / T14549-93, Set to 10% of the limit; for example, for a 10kV line, the third harmonic voltage content does not exceed 3.2%, so it is set to 3.2%*10%*10000=3.2V, that is, is 3.2.

[0077] In one embodiment, since the feeder in the power grid is used as a unit, if the harmonic power in each feeder is balanced, the system is balanced overall. However, due to the difference in feeder impedance, the feeder power is mismatched, resulting in harmonic power flowing between the feeders.

[0078] In one embodiment, when the harmonic power between the feeders in the power grid is balanced, it satisfies the harmonic power balance formula, wherein the harmonic power balance formula is as follows:

[0079] X H，1 S HR，1 =...=X H，n S HR，n =...=X H，N S HR，N =K;

[0080] Where, X H，1 represents the harmonic impedance of the first feeder, S HR，1 Indicates the rated harmonic power of the load on the first feeder, X H，n represents the harmonic impedance of the nth feeder, S HR，n represents the rated harmonic power of the load on the nth feeder, X H，N represents the harmonic impedance of the Nth feeder, S HR，N It represents the rated harmonic power of the load of the Nth feeder, and K is the balance factor.

[0081] In one embodiment, when the harmonic power in the feeder is balanced, the harmonic impedance of the feeder and the rated harmonic power of the load are obtained to calculate the balance factor.

[0082] Specifically, based on the harmonic power balance formula, the harmonic impedance of the feeder and the rated harmonic power of the load are substituted into the harmonic power balance formula to calculate the balance factor.

[0083] In one embodiment, since the harmonic power and the impedance are related when the system harmonic power is balanced, in this embodiment, based on the balance factor, a first relationship between the harmonic power and the harmonic impedance is determined, wherein the first relationship is as follows:

[0084] S HR，n =K / X H，n ;

[0085] In the formula, S HR，n is the harmonic power of the nth feeder, K is the balance factor, X H，n is the harmonic impedance of the nth feeder.

[0086] Step 102: Acquire actual harmonic power in the power grid, convert the actual harmonic power into a first harmonic impedance based on the first relationship, and calculate a harmonic voltage value of a target feeder in the power grid based on the first harmonic impedance and the harmonic voltage droop control strategy.

[0087] In one embodiment, actual harmonic power in the power grid is collected and substituted into the first relationship, so that a first harmonic impedance is calculated based on the first relationship, thereby completing conversion between the actual harmonic power and the first harmonic impedance.

[0088] In one embodiment, when calculating the harmonic voltage value of a target feeder in a power grid based on the first harmonic impedance and the harmonic voltage droop control strategy, the harmonic voltage droop control strategy is also updated based on the first relationship to obtain a first harmonic voltage droop control strategy; the first harmonic impedance is substituted into the first harmonic voltage droop control strategy to calculate the harmonic voltage value of the target feeder in the power grid.

[0089] Specifically, the harmonic formula in the harmonic voltage droop control strategy is replaced by the first relationship to obtain the first harmonic voltage droop control strategy, wherein the first harmonic voltage droop control strategy is as follows:

[0090]

[0091] In one embodiment, the harmonic voltage value of the target feeder in the power grid is obtained by directly solving the first harmonic voltage droop control strategy.

[0092] Step 103: Determine whether the harmonic voltage value satisfies multiple harmonic power balance. If not, adjust the first harmonic impedance to update the harmonic voltage value until it is determined based on the harmonic voltage value that multiple harmonic power balance is satisfied.

[0093] In one embodiment, multiple harmonic inductances of the target feeder are obtained, and based on the multiple harmonic inductances, each harmonic impedance of the target feeder is calculated.

[0094] Specifically, the multiple harmonic inductances are substituted into the calculation formulas of each harmonic impedance to obtain each harmonic impedance of the target feeder, wherein the calculation formulas of each harmonic impedance are as follows:

[0095] X HS,n =HωL H,n ;

[0096] Where, X HS，n is the nth harmonic impedance, H is the harmonic order, ω is the angular frequency, L H，n is the Hth harmonic inductance of the nth feeder line.

[0097] Preferably, in this embodiment, the case of 2-50 harmonics is considered, that is, the value of the harmonic order is 2-50.

[0098] Preferably, a 50 Hz power frequency system is considered in this embodiment. For the 50 Hz power frequency system, ω=2*π*50.

[0099] In one embodiment, the fundamental frequency negative sequence impedance of the target feeder is simultaneously acquired, and based on the fundamental frequency negative sequence impedance and the harmonic impedances, a second relationship between the harmonic impedance and the fundamental frequency negative sequence impedance and the harmonic impedances is determined.

[0100] Specifically, for harmonic impedance, it is composed of fundamental frequency negative sequence impedance Xneg,n+ and each harmonic impedance X HS，n Therefore, based on the fundamental frequency negative sequence impedance and the harmonic impedances, a second relationship between the harmonic impedance and the fundamental frequency negative sequence impedance and the harmonic impedances is determined, wherein the second relationship is as follows:

[0101]

[0102] Where, X H，n is the harmonic impedance, Xneg, n is the fundamental frequency negative sequence impedance, X HS，n is the impedance of each harmonic.

[0103] In one embodiment, based on the second relationship, the first harmonic voltage droop control strategy is updated to obtain a second harmonic voltage droop control strategy.

[0104] Specifically, the second relationship is substituted into the second harmonic voltage droop control strategy to update the first harmonic voltage droop control strategy and obtain the second harmonic voltage droop control strategy. The second harmonic voltage droop control strategy is as follows:

[0105]

[0106] In one embodiment, based on the second harmonic voltage droop control strategy, the control of the harmonic voltage has been converted into the control of the feeder harmonic impedance.

[0107] In one embodiment, when judging whether the harmonic voltage value satisfies multiple harmonic power balance, the harmonic voltage value is substituted into the second harmonic voltage droop control strategy to judge whether the harmonic voltage value satisfies the second harmonic voltage droop control strategy. If so, it is determined that the harmonic voltage value satisfies multiple harmonic power balance. Otherwise, it is determined that the harmonic voltage value does not satisfy multiple harmonic power balance.

[0108] Preferably, in addition to judging whether multiple harmonic power balance is satisfied by the harmonic voltage value, it is also possible to judge whether multiple harmonic power balance is satisfied based on each harmonic impedance in the harmonic impedance.

[0109] Preferably, multiple harmonic impedances in the current feeder are obtained, and the multiple harmonic impedances are substituted into the second harmonic voltage droop control strategy to determine whether the multiple harmonic impedances satisfy the second harmonic voltage droop control strategy; if so, it is determined that the multiple harmonic impedances satisfy the multiple harmonic power balance; otherwise, it is determined that the multiple harmonic impedances do not satisfy the multiple harmonic power balance.

[0110] In one embodiment, harmonic power balance can be achieved by adjusting each harmonic reactance to suppress grid harmonic fluctuations and coupling effects; that is, adjusting each harmonic reactance ωL in the second harmonic voltage droop control strategy H,n .

[0111] Step 104: When it is determined that multiple harmonic power balance is satisfied, the harmonic power balance impedance value of each feeder is obtained, and the multiple harmonic impedances of the target feeder are obtained at the same time, and the compensation impedance is calculated according to the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder, and the harmonic impedance of the target feeder is compensated based on the compensation impedance.

[0112] In one embodiment, when it is determined that multiple harmonic power balance is satisfied, the multiple harmonic impedances in the second harmonic voltage droop control strategy are used as the harmonic power balance impedance values ​​of each feeder line.

[0113] In one embodiment, when obtaining the harmonic power balance impedance value of each feeder, based on the second harmonic voltage droop control strategy, a calculation formula for the harmonic power balance impedance value of each feeder is obtained, and based on the calculation formula for the harmonic power balance impedance value of each feeder, the harmonic power balance impedance value of each feeder is calculated; wherein, the calculation formula for the harmonic power balance impedance value of each feeder is as follows:

[0114]

[0115] In one embodiment, when calculating the compensation impedance according to the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder, the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder are substituted into a preset compensation impedance calculation formula to calculate the compensation impedance, wherein the compensation impedance calculation formula is as follows:

[0116]

[0117] In the formula, HX2 is the compensation impedance, H is the harmonic order, ω is the angular frequency, L H,n is the Hth harmonic inductance of the nth feeder line, and HX1 is the multiple harmonic impedance.

[0118] In one embodiment, the compensation method for line harmonic impedance can be series connection, parallel connection, or a combination of series and parallel connection. The feeder line can be simplified to the line impedance and the capacitance to ground, such as Figure 3 As shown, Figure 3 is a schematic diagram of impedance before feeder compensation, in which B is the line-to-ground capacitance and R is the line impedance; when the line harmonic impedance is compensated in series, such as Figure 4 As shown, Figure 4 This is a schematic diagram of feeder series compensation.

[0119] Example 2, see Figure 2 , Figure 2 : is a schematic diagram of a structure of an embodiment of a harmonic suppression device provided by the present invention, such as Figure 2 As shown, the device includes a harmonic voltage droop control strategy setting module 201, a harmonic voltage value calculation module 202, a harmonic power balance judgment module 203 and a compensation impedance calculation module 204, which are specifically as follows:

[0120] The harmonic voltage droop control strategy setting module 201 is used to set the harmonic voltage droop control strategy and determine the first relationship between harmonic power and harmonic impedance.

[0121] The harmonic voltage value calculation module 202 is used to obtain actual harmonic power in the power grid, convert the actual harmonic power into a first harmonic impedance based on the first relationship, and calculate the harmonic voltage value of a target feeder in the power grid based on the first harmonic impedance and the harmonic voltage droop control strategy.

[0122] The harmonic power balance judgment module 203 is used to judge whether the harmonic voltage value satisfies multiple harmonic power balance. If not, the first harmonic impedance is adjusted to update the harmonic voltage value until it is judged based on the harmonic voltage value that multiple harmonic power balance is satisfied.

[0123] The compensation impedance calculation module 204 is used to obtain the harmonic power balance impedance value of each feeder when it is determined that the multiple harmonic power balance is satisfied, and simultaneously obtain the multiple harmonic impedances of the target feeder, calculate the compensation impedance according to the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder, and compensate the harmonic impedance of the target feeder based on the compensation impedance.

[0124] In one embodiment, the harmonic voltage droop control strategy setting module 201 is used to set a harmonic voltage droop control strategy, wherein the harmonic voltage droop control strategy is as follows:

[0125]

[0126] Where V H，n is the Hth harmonic voltage value of the nth feeder, is the rated value of the Hth harmonic voltage of the nth feeder, m is the droop control parameter, S d HR，n is the actual harmonic power.

[0127] In one embodiment, the harmonic voltage droop control strategy setting module 201 is used to determine the first relationship between harmonic power and harmonic impedance, specifically including: when the harmonic power in the feeder is balanced, obtaining the harmonic impedance of the feeder and the rated harmonic power of the load, and calculating the balance factor; based on the balance factor, determining the first relationship between the harmonic power and the harmonic impedance, wherein the first relationship is as follows:

[0128] S HR，n =K / X H，n ;

[0129] In the formula, S HR，n is the harmonic power of the nth feeder, K is the balance factor, X H，n is the harmonic impedance of the nth feeder.

[0130] In one embodiment, the harmonic voltage value calculation module 202 is used to calculate the harmonic voltage value of the target feeder in the power grid based on the first harmonic impedance and the harmonic voltage droop control strategy, specifically including: based on the first relationship, updating the harmonic voltage droop control strategy to obtain a first harmonic voltage droop control strategy; substituting the first harmonic impedance into the first harmonic voltage droop control strategy to calculate the harmonic voltage value of the target feeder in the power grid; wherein the first harmonic voltage droop control strategy is as follows:

[0131]

[0132] In one embodiment, the harmonic power balance judgment module 203 is used to judge whether the harmonic voltage value satisfies the multiple harmonic power balance, and further includes: obtaining the multiple harmonic inductances of the target feeder, and calculating the harmonic impedances of the target feeder based on the multiple harmonic inductances; simultaneously obtaining the fundamental frequency negative sequence impedance of the target feeder, and determining the second relationship between the harmonic impedance and the fundamental frequency negative sequence impedance and the harmonic impedances based on the fundamental frequency negative sequence impedance and the harmonic impedances; and based on the second relationship, updating the first harmonic voltage droop control strategy to obtain a second harmonic voltage droop control strategy.

[0133] In one embodiment, the harmonic power balance judgment module 203 is used to judge whether the harmonic voltage value satisfies multiple harmonic power balance, specifically including: substituting the harmonic voltage value into the second harmonic voltage droop control strategy, judging whether the harmonic voltage value satisfies the second harmonic voltage droop control strategy, and if so, determining that the harmonic voltage value satisfies multiple harmonic power balance, otherwise, determining that the harmonic voltage value does not satisfy multiple harmonic power balance.

[0134] In one embodiment, the compensation impedance calculation module 204 is used to calculate the compensation impedance according to the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder line, specifically including:

[0135] Substitute the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder into a preset compensation impedance calculation formula to calculate the compensation impedance, wherein the compensation impedance calculation formula is as follows:

[0136] HX2=HωL H,n -HX1;

[0137] In the formula, HX2 is the compensation impedance, H is the harmonic order, ω is the angular frequency, L H,n is the Hth harmonic inductance of the nth feeder line, and HX1 is the multiple harmonic impedance.

[0138] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0139] It should be noted that the above-mentioned embodiments of the harmonic suppression device are merely illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0140] Based on the above-mentioned embodiment of the harmonic suppression method, another embodiment of the present invention provides a harmonic suppression terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the harmonic suppression method of any embodiment of the present invention is implemented.

[0141] Exemplarily, in this embodiment, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the harmonic suppression terminal device.

[0142] The harmonic suppression terminal device may be a computing device such as a desktop computer, a notebook, a palm computer, a cloud server, etc. The harmonic suppression terminal device may include, but is not limited to, a processor and a memory.

[0143] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the harmonic suppression terminal device, and uses various interfaces and lines to connect various parts of the entire harmonic suppression terminal device.

[0144] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the harmonic suppression terminal device by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0145] Based on the above-mentioned embodiment of the harmonic suppression method, another embodiment of the present invention provides a storage medium, wherein the storage medium includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the harmonic suppression method of any embodiment of the present invention.

[0146] In this embodiment, the storage medium is a computer-readable storage medium, and the computer program includes computer program code, which may be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0147] In summary, the present invention provides a harmonic suppression method, device, equipment and storage medium, which determines the first relationship between harmonic power and harmonic impedance by setting a harmonic voltage droop control strategy; based on the first relationship, the actual harmonic power in the power grid is converted into a first harmonic impedance, and based on the first harmonic impedance and the harmonic voltage droop control strategy, the harmonic voltage value of the target feeder in the power grid is calculated; it is judged whether the harmonic voltage value satisfies multiple harmonic power balances, and when it is determined that multiple harmonic power balances are satisfied, the harmonic power balance impedance values ​​of each feeder are obtained, and the multiple harmonic impedances of the target feeder are obtained at the same time, and the compensation impedance is calculated according to the harmonic impedance and the harmonic power balance impedance values ​​of each feeder, and the harmonic impedance of the target feeder is compensated based on the compensation impedance; compared with the prior art, the technical solution of the present invention can improve the overall harmonic suppression level of the power grid and ensure the stable operation and quality of the power system.

[0148] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A harmonic suppression method, characterized in that: include: Setting a harmonic voltage droop control strategy to determine a first relationship between harmonic power and harmonic impedance; Acquire actual harmonic power in the power grid, convert the actual harmonic power into a first harmonic impedance based on the first relationship, and calculate a harmonic voltage value of a target feeder in the power grid based on the first harmonic impedance and the harmonic voltage droop control strategy; Determining whether the harmonic voltage value satisfies multiple harmonic power balance, and if not, adjusting the first harmonic impedance to update the harmonic voltage value until it is determined based on the harmonic voltage value that multiple harmonic power balance is satisfied; When it is determined that multiple harmonic power balance is satisfied, the harmonic power balance impedance value of each feeder is obtained, and the multiple harmonic impedances of the target feeder are obtained at the same time, and the compensation impedance is calculated according to the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder, and the harmonic impedance of the target feeder is compensated based on the compensation impedance; The harmonic voltage droop control strategy is as follows: ； In the formula, is the Hth harmonic voltage value of the nth feeder, is the rated value of the Hth harmonic voltage of the nth feeder, is the droop control parameter, is the actual harmonic power; The determining of the first relationship between the harmonic power and the harmonic impedance specifically includes: When the harmonic power in the feeder is balanced, the harmonic impedance of the feeder and the rated harmonic power of the load are obtained to calculate the balancing factor; Based on the balance factor, a first relationship between harmonic power and harmonic impedance is determined, wherein the first relationship is as follows: ； In the formula, is the harmonic power of the nth feeder, is the balance factor, is the harmonic impedance of the nth feeder; The calculating the harmonic voltage value of the target feeder in the power grid based on the first harmonic impedance and the harmonic voltage droop control strategy specifically includes: Based on the first relationship, updating the harmonic voltage droop control strategy to obtain a first harmonic voltage droop control strategy; Substituting the first harmonic impedance into the first harmonic voltage droop control strategy to calculate the harmonic voltage value of the target feeder in the power grid; The first harmonic voltage droop control strategy is as follows: 。 2. A harmonic suppression method as claimed in claim 1, characterized in that: Before judging whether the harmonic voltage value satisfies multiple harmonic power balance, the method further includes: Acquire multiple harmonic inductances of the target feeder, and calculate each harmonic impedance of the target feeder based on the multiple harmonic inductances; Simultaneously acquiring the fundamental frequency negative sequence impedance of the target feeder, and determining a second relationship between the harmonic impedance and the fundamental frequency negative sequence impedance and the harmonic impedance based on the fundamental frequency negative sequence impedance and the harmonic impedance; and based on the second relationship, updating the first harmonic voltage droop control strategy to obtain a second harmonic voltage droop control strategy; The second relationship is as follows: ； In the formula, is the fundamental frequency negative sequence impedance of the nth feeder, is the harmonic impedance of the nth feeder, is the angular frequency, H is the harmonic number, is the Hth harmonic inductance of the nth feeder line.

3. A harmonic suppression method as claimed in claim 2, characterized in that: Determining whether the harmonic voltage value satisfies multiple harmonic power balance specifically includes: Substitute the harmonic voltage value into the second harmonic voltage droop control strategy to determine whether the harmonic voltage value satisfies the second harmonic voltage droop control strategy; if so, determine that the harmonic voltage value satisfies multiple harmonic power balance; otherwise, determine that the harmonic voltage value does not satisfy multiple harmonic power balance.

4. A harmonic suppression method as claimed in claim 1, characterized in that: Calculating the compensation impedance according to the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder line specifically includes: Substitute the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder into a preset compensation impedance calculation formula to calculate the compensation impedance, wherein the compensation impedance calculation formula is as follows: ; In the formula, To compensate for the impedance, is the harmonic order, is the Hth harmonic inductance of the nth feeder, is the multiple harmonic impedance.

5. A harmonic suppression device, characterized in that: include: Harmonic voltage droop control strategy setting module, harmonic voltage value calculation module, harmonic power balance judgment module and compensation impedance calculation module; Wherein, the harmonic voltage droop control strategy setting module is used to set the harmonic voltage droop control strategy and determine the first relationship between the harmonic power and the harmonic impedance; The harmonic voltage value calculation module is used to obtain actual harmonic power in the power grid, convert the actual harmonic power into a first harmonic impedance based on the first relationship, and calculate the harmonic voltage value of a target feeder in the power grid based on the first harmonic impedance and the harmonic voltage droop control strategy; The harmonic power balance judgment module is used to judge whether the harmonic voltage value satisfies multiple harmonic power balance, and if not, adjust the first harmonic impedance to update the harmonic voltage value until it is judged based on the harmonic voltage value that multiple harmonic power balance is satisfied; The compensation impedance calculation module is used to obtain the harmonic power balance impedance value of each feeder when it is determined that the multiple harmonic power balance is satisfied, and simultaneously obtain the multiple harmonic impedances of the target feeder, calculate the compensation impedance according to the multiple harmonic impedances and the harmonic power balance impedance values ​​of each feeder, and compensate the harmonic impedance of the target feeder based on the compensation impedance; The harmonic voltage droop control strategy is as follows: ； In the formula, is the Hth harmonic voltage value of the nth feeder, is the rated value of the Hth harmonic voltage of the nth feeder, is the droop control parameter, is the actual harmonic power; The harmonic voltage droop control strategy setting module is used to determine the first relationship between harmonic power and harmonic impedance, specifically including: when the harmonic power in the feeder is balanced, obtaining the harmonic impedance of the feeder and the rated harmonic power of the load, and calculating the balance factor; based on the balance factor, determining the first relationship between the harmonic power and the harmonic impedance, wherein the first relationship is as follows: ； In the formula, is the harmonic power of the nth feeder, is the balance factor, is the harmonic impedance of the nth feeder; The harmonic voltage value calculation module is used to calculate the harmonic voltage value of the target feeder in the power grid based on the first harmonic impedance and the harmonic voltage droop control strategy, specifically including: based on the first relationship, updating the harmonic voltage droop control strategy to obtain a first harmonic voltage droop control strategy; substituting the first harmonic impedance into the first harmonic voltage droop control strategy to calculate the harmonic voltage value of the target feeder in the power grid; wherein the first harmonic voltage droop control strategy is as follows: 。 6. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the harmonic suppression method according to any one of claims 1 to 4 when executing the computer program.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the harmonic suppression method according to any one of claims 1 to 4.

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