Voltage calculation method and device for steady-state reactive power control

Abstract

The invention provides a steady-state reactive power control voltage calculation method and device, and relates to the technical field of fault testing. The method comprises the following steps: calculating a first to-be-judged voltage amplitude according to a system equivalent voltage, an equivalent impedance parameter and a first reactive power under the condition that an active branch does not exist at a grid-connected point; and if it is determined that the first to-be-determined voltage amplitude is greater than zero, calculating a first target voltage amplitude and a first target voltage phase angle according to the first to-be-determined voltage amplitude, the first reactive power and the voltage amplitude of the system equivalent voltage. The device executes the method. According to the voltage calculation method and device for steady-state reactive power control provided by the embodiment of the invention, the grid-connected voltage of the reactive power compensation device under different reactive power value outputs can be accurately calculated.

Description

Technical Field

[0001] The invention relates to the technical field of fault testing, and in particular to a voltage calculation method and device for steady-state reactive power control. Background Art

[0002] Reactive power compensation devices for new energy are important voltage support equipment for new energy stations. Under the steady-state reactive power control strategy, the reactive power compensation device outputs the corresponding reactive power value according to the reactive power command value, thereby supporting the grid connection point voltage. Under the current steady-state reactive power control strategy, although the reactive power compensation device accurately outputs the corresponding reactive power value according to the command value, it cannot accurately calculate the grid connection voltage of the reactive power compensation device under different reactive power value outputs. Summary of the invention

[0003] In view of the problems in the prior art, an embodiment of the present invention provides a voltage calculation method and device for steady-state reactive power control, which can at least partially solve the problems in the prior art.

[0004] On the one hand, the present invention provides a voltage calculation method for steady-state reactive power control, comprising:

[0005] The first voltage amplitude to be determined is calculated based on the system equivalent voltage, the equivalent impedance parameter and the first reactive power when there is no active branch at the grid connection point;

[0006] If it is determined that the first voltage amplitude to be determined is greater than zero, a first target voltage amplitude and a first target voltage phase angle are calculated according to the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage.

[0007] The step of calculating the first voltage amplitude to be determined based on the system equivalent voltage, the equivalent impedance parameter, and the first reactive power when there is no active branch at the grid connection point includes:

[0008] A first resistance-inductance angle is calculated according to the equivalent impedance parameter and the angular frequency, and a first coefficient is calculated according to the first reactive power, the system equivalent voltage, the equivalent impedance parameter and the angular frequency;

[0009] Calculate a first voltage phase angle to be determined according to the first coefficient, the first resistance-inductance angle and the system equivalent voltage;

[0010] If it is determined that the first voltage phase angle to be determined is within a first preset value interval, the first voltage amplitude to be determined is calculated according to the first voltage phase angle to be determined, the first coefficient and the first resistance-inductance angle.

[0011] The step of calculating the first voltage phase angle to be determined according to the first coefficient, the first resistance-inductance angle and the system equivalent voltage includes:

[0012] The first voltage phase angle to be determined is calculated according to the following formula:

[0013]

[0014]

[0015] Wherein, θ1 is the first voltage phase angle value of the first voltage phase angle to be determined, θ2 is the second voltage phase angle value of the first voltage phase angle to be determined, V K1 is the first coefficient, α is the first resistance-sensitivity angle, U s is the voltage amplitude of the system equivalent voltage.

[0016] The step of calculating the first voltage amplitude to be determined according to the first voltage phase angle to be determined, the first coefficient and the first resistance-sensitivity angle includes:

[0017] The first voltage amplitude to be determined is calculated according to the following formula:

[0018]

[0019]

[0020] Among them, V d1 is the first voltage amplitude value of the first voltage amplitude to be determined, V d2 is a second voltage phase angle value of the first voltage amplitude to be determined.

[0021] Wherein, the voltage calculation method of the steady-state reactive power control further includes:

[0022] The second resistance-inductance angle is calculated according to the equivalent impedance parameter, the angular frequency, the second reactive power and the active power when an active branch exists at the grid connection point, and the second coefficient is calculated according to the second reactive power, the system equivalent voltage, the equivalent impedance parameter, the second reactive power, the active power and the angular frequency;

[0023] Calculate a second voltage phase angle to be determined according to the second coefficient, the second resistance-inductance angle and the system equivalent voltage;

[0024] If it is determined that the second voltage phase angle to be determined is within the second preset value interval, the second voltage amplitude to be determined is calculated according to the second voltage phase angle to be determined, the second coefficient and the second resistance-inductance angle;

[0025] If it is determined that the second voltage amplitude to be determined is greater than zero, the second target voltage amplitude and the second target voltage phase angle are calculated according to the second voltage amplitude to be determined, the second reactive power, the second resistance-inductance angle and the voltage amplitude of the system equivalent voltage.

[0026] The step of calculating the second voltage phase angle to be determined according to the second coefficient, the second resistance-inductance angle and the system equivalent voltage includes:

[0027] The second voltage phase angle to be determined is calculated according to the following formula:

[0028]

[0029]

[0030] Wherein, θ3 is the first voltage phase angle value of the second voltage phase angle to be determined, θ4 is the second voltage phase angle value of the second voltage phase angle to be determined, V K2 is the second coefficient, and α′ is the second resistance-sensitivity angle.

[0031] The step of calculating the second voltage amplitude to be determined according to the second voltage phase angle to be determined, the second coefficient and the second resistance-inductance angle includes:

[0032] The second voltage amplitude to be determined is calculated according to the following formula:

[0033]

[0034]

[0035] Among them, V d3 is the first voltage amplitude value of the second voltage amplitude to be determined, V d4 is a second voltage phase angle value of the second voltage amplitude to be determined.

[0036] In one aspect, the present invention provides a voltage calculation device for steady-state reactive power control, comprising:

[0037] A first calculation unit, configured to calculate a first voltage amplitude to be determined based on a system equivalent voltage, an equivalent impedance parameter, and a first reactive power when no active branch exists at a grid connection point;

[0038] The second calculation unit is used to calculate a first target voltage amplitude and a first target voltage phase angle according to the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage if it is determined that the first voltage amplitude to be determined is greater than zero.

[0039] Wherein, the first computing unit is specifically used for:

[0040] A first resistance-inductance angle is calculated according to the equivalent impedance parameter and the angular frequency, and a first coefficient is calculated according to the first reactive power, the system equivalent voltage, the equivalent impedance parameter and the angular frequency;

[0041] Calculate a first voltage phase angle to be determined according to the first coefficient, the first resistance-inductance angle and the system equivalent voltage;

[0042] If it is determined that the first voltage phase angle to be determined is within a first preset value interval, the first voltage amplitude to be determined is calculated according to the first voltage phase angle to be determined, the first coefficient and the first resistance-inductance angle.

[0043] Wherein, the first computing unit is further specifically used for:

[0044] The first voltage phase angle to be determined is calculated according to the following formula:

[0045]

[0046]

[0047] Wherein, θ1 is the first voltage phase angle value of the first voltage phase angle to be determined, θ2 is the second voltage phase angle value of the first voltage phase angle to be determined, V K1 is the first coefficient, α is the first resistance-sensing angle, U s is the voltage amplitude of the system equivalent voltage.

[0048] Wherein, the first computing unit is further specifically used for:

[0049] The first voltage amplitude to be determined is calculated according to the following formula:

[0050]

[0051]

[0052] Among them, V d1 is the first voltage amplitude value of the first voltage amplitude to be determined, V d2 is a second voltage phase angle value of the first voltage amplitude to be determined.

[0053] Wherein, the voltage calculation device for steady-state reactive power control is also used for:

[0054] The second resistance-inductance angle is calculated according to the equivalent impedance parameter, the angular frequency, the second reactive power and the active power when an active branch exists at the grid connection point, and the second coefficient is calculated according to the second reactive power, the system equivalent voltage, the equivalent impedance parameter, the second reactive power, the active power and the angular frequency;

[0055] Calculate a second voltage phase angle to be determined according to the second coefficient, the second resistance-inductance angle and the system equivalent voltage;

[0056] If it is determined that the second voltage phase angle to be determined is within the second preset value interval, the second voltage amplitude to be determined is calculated according to the second voltage phase angle to be determined, the second coefficient and the second resistance-inductance angle;

[0057] If it is determined that the second voltage amplitude to be determined is greater than zero, the second target voltage amplitude and the second target voltage phase angle are calculated according to the second voltage amplitude to be determined, the second reactive power, the second resistance-inductance angle and the voltage amplitude of the system equivalent voltage.

[0058] Wherein, the voltage calculation device for steady-state reactive power control is also specifically used for:

[0059] The second voltage phase angle to be determined is calculated according to the following formula:

[0060]

[0061]

[0062] Wherein, θ3 is the first voltage phase angle value of the second voltage phase angle to be determined, θ4 is the second voltage phase angle value of the second voltage phase angle to be determined, V K2 is the second coefficient, and α′ is the second resistance-sensitivity angle.

[0063] Wherein, the voltage calculation device for steady-state reactive power control is also specifically used for:

[0064] The second voltage amplitude to be determined is calculated according to the following formula:

[0065]

[0066]

[0067] Among them, V d3 is the first voltage amplitude value of the second voltage amplitude to be determined, V d4 is a second voltage phase angle value of the second voltage amplitude to be determined.

[0068] In another aspect, an embodiment of the present invention provides an electronic device, including: a processor, a memory, and a bus, wherein:

[0069] The processor and the memory communicate with each other via the bus;

[0070] The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the following method:

[0071] The first voltage amplitude to be determined is calculated based on the system equivalent voltage, the equivalent impedance parameter and the first reactive power when there is no active branch at the grid connection point;

[0072] If it is determined that the first voltage amplitude to be determined is greater than zero, a first target voltage amplitude and a first target voltage phase angle are calculated according to the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage.

[0073] An embodiment of the present invention provides a non-transitory computer-readable storage medium, including:

[0074] The non-transitory computer-readable storage medium stores computer instructions, which cause the computer to execute the following method:

[0075] The first voltage amplitude to be determined is calculated based on the system equivalent voltage, the equivalent impedance parameter and the first reactive power when there is no active branch at the grid connection point;

[0076] If it is determined that the first voltage amplitude to be determined is greater than zero, a first target voltage amplitude and a first target voltage phase angle are calculated according to the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage.

[0077] The voltage calculation method and device for steady-state reactive power control provided in the embodiment of the present invention calculate the first voltage amplitude to be determined based on the system equivalent voltage, equivalent impedance parameters and the first reactive power when there is no active branch at the grid-connected point; if it is determined that the first voltage amplitude to be determined is greater than zero, then the first target voltage amplitude and the first target voltage phase angle are calculated based on the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage, so as to accurately calculate the grid-connected voltage of the reactive compensation device under different reactive value outputs. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0079] Figure 1 It is a flow chart of a voltage calculation method for steady-state reactive power control provided by an embodiment of the present invention.

[0080] Figure 2 It is a system equivalent circuit of the new energy reactive power compensation device provided by the embodiment of the present invention when there is no active branch at the grid connection point.

[0081] Figure 3 It is a system equivalent circuit of the new energy reactive power compensation device provided by the embodiment of the present invention when there is an active branch at the grid connection point.

[0082] Figure 4 It is a flow chart of a voltage calculation method for steady-state reactive power control provided by another embodiment of the present invention.

[0083] Figure 5 It is a structural schematic diagram of a voltage calculation device for steady-state reactive power control provided by an embodiment of the present invention.

[0084] Figure 6 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0085] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily.

[0086] Figure 1 FIG. 1 is a flow chart of a voltage calculation method for steady-state reactive power control provided by an embodiment of the present invention. Figure 1 As shown, the voltage calculation method for steady-state reactive power control provided by the embodiment of the present invention includes:

[0087] Step S1: Calculate a first voltage amplitude to be determined based on a system equivalent voltage, an equivalent impedance parameter, and a first reactive power when no active branch exists at a grid connection point.

[0088] Step S2: If it is determined that the first voltage amplitude to be determined is greater than zero, a first target voltage amplitude and a first target voltage phase angle are calculated based on the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage.

[0089] In the above step S1, the device calculates the first voltage amplitude to be determined based on the system equivalent voltage, equivalent impedance parameters and the first reactive power when there is no active branch at the grid connection point. The device can be a computer device that executes the method. It should be noted that the acquisition and analysis of data involved in the embodiment of the present invention is authorized by the user. Figure 2 and Figure 3 As shown in FIG. 1 , it is the system equivalent circuit of the new energy reactive power compensation device when there is or does not exist an active branch at the grid connection point.

[0090] The system equivalent voltage can be obtained through large power grid simulation, and the system voltage amplitude and phase remain stable. The system equivalent voltage can be expressed as

[0091] Among them, U s is the voltage amplitude, ω×t is the phase, α us is the system equivalent voltage phase angle, which can be set to 0, and ω is the angular frequency, which is 314.

[0092] The equivalent impedance parameter is the external equivalent impedance parameter of the grid-connected point of the new energy equipment. The equivalent impedance parameter can be expressed as

[0093] Among them, the system short-circuit current α is is the system equivalent current phase angle, I s is the current amplitude.

[0094] Impedance amplitude |Z|=sqrt(R s ×R s +ω×ω×L s ×L s ).

[0095] Assuming the system impedance ratio You can get R s =|Z|×sqrt(1+K 2 ), L s =|Z|×sqrt(1+K 2 )×K / ω.

[0096] The present invention takes into account the influence of active output devices such as wind turbines and photovoltaic equipment in new energy stations, and assumes that the active power generated by active equipment such as wind turbines and photovoltaic equipment is equivalent to P when the reactive power compensation device is in steady-state reactive operation.

[0097] In the case where there is no active branch at the grid connection point, it is assumed that the reactive power generated by the reactive compensation device under the steady-state reactive power strategy is Q (which can also be expressed as Q1. Since Q1 and subsequent Q2 are both set values ​​and there is a possibility that the values ​​are the same, the Q in the description corresponding to the situation where there is no active branch at the grid connection point can be understood as Q1, and the Q in the description corresponding to the situation where there is an active branch at the grid connection point can be understood as Q2). When Q>0, it means that the system generates capacitive reactive power, and when Q<0, it means that the system generates inductive reactive power. Assuming that the voltage at the grid connection point of the reactive compensation device is Where V d is the grid voltage amplitude when there is no active branch at the grid connection point, θ is the phase angle of the grid connection point voltage leading the system voltage, and the vector relationship equation is as follows:

[0098]

[0099] in, The amplitude is V d , a vector with phase θ, The amplitude is A vector with a phase of 2 times θ.

[0100] The first coefficient is Based on this, the relationship is as follows:

[0101]

[0102] Among them, α is the first resistance angle,

[0103] After solving, the first voltage phase angle to be determined is obtained, and the expression is as follows:

[0104]

[0105]

[0106] The first preset value interval can be selected as If the first voltage phase angle to be determined is within the above range, the first voltage amplitude to be determined is calculated as follows:

[0107]

[0108]

[0109] If the first voltage phase angle to be determined is not within the above range, there is no need to calculate the first voltage amplitude to be determined, and directly determining the first target voltage amplitude and the first target voltage phase angle is invalid.

[0110] In the case of active branches at the grid connection point, it is assumed that the reactive power generated by the reactive compensation device under the steady-state reactive strategy is Q. When Q>0, it means that the system generates capacitive reactive power, and when Q<0, it means that the system generates inductive reactive power. The vector relationship equation is as follows:

[0111]

[0112] in, The amplitude is V d ′, a vector with phase θ, The amplitude is The vector with a phase of 2 times θ, V d ′ is the grid-connected voltage amplitude when there is an active branch at the grid-connected point.

[0113] The second coefficient is Based on this, the relationship is as follows:

[0114]

[0115] Among them, α′ is the second resistance-sensitivity angle,

[0116] After solving, the second voltage phase angle to be determined is obtained, and the expression is as follows:

[0117]

[0118]

[0119] The second preset value interval can be selected as If the second voltage phase angle to be determined is within the above range, the second voltage amplitude to be determined is calculated as follows:

[0120]

[0121]

[0122] If the second voltage phase angle to be determined is not within the above range, there is no need to calculate the second voltage amplitude to be determined, and directly determining the second target voltage amplitude and the second target voltage phase angle is invalid.

[0123] In the above step S2, if the device determines that the first voltage amplitude to be determined is greater than zero, the first target voltage amplitude and the first target voltage phase angle are calculated based on the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage. Figure 4 As shown, when there is no active branch at the grid connection point, if V d1 and V d2If both are not greater than 0, the positive one is taken as the first target voltage amplitude, and the corresponding voltage phase angle is the first target voltage phase angle.

[0124] If V d1 and V d2 If both are greater than 0, the first reactive power Q is compared with 0. If Q>0, V d1 and V d2 Respectively with U s Compare, if one of them is greater than U s , and the other is smaller than U s , then it will be greater than U s One of the values ​​is taken as the first target voltage amplitude, and the voltage phase angle corresponding to it is taken as the first target voltage phase angle.

[0125] If both are greater than U s , then V d1 and V d2 Compare them and take the larger one as the first target voltage amplitude, and the corresponding voltage phase angle as the first target voltage phase angle.

[0126] If both are less than U s , indicating that it is invalid and is not used as the first target voltage phase angle.

[0127] If Q<0, then V d1 and V d2 Respectively with U s Compare, if one of them is greater than U s , and the other is smaller than U s , then it will be less than U s One of the values ​​is taken as the first target voltage amplitude, and the voltage phase angle corresponding to it is taken as the first target voltage phase angle.

[0128] If both are less than U s , then V d1 and V d2 Compare them and take the smaller one as the first target voltage amplitude, and the corresponding voltage phase angle as the first target voltage phase angle.

[0129] If both are greater than U s , indicating that it is invalid and is not used as the first target voltage phase angle.

[0130] If V d1 and V d2 If both are less than 0, they are not used as the first target voltage phase angle.

[0131] like Figure 4 As shown, when there is an active branch at the grid connection point, if V d3 and V d4If both are not greater than 0, the positive one is taken as the second target voltage amplitude, and the corresponding voltage phase angle is taken as the second target voltage phase angle.

[0132] If V d3 and V d4 If both are greater than 0, the second reactive power Q is compared with 0. If Q>0, V d3 and V d4 Respectively with U s Compare, if one of them is greater than U s , and the other is smaller than U s , then it will be greater than U s One of the values ​​is used as the second target voltage amplitude, and the corresponding voltage phase angle is used as the second target voltage phase angle.

[0133] If both are greater than U s , then V d3 and V d4 Compare them and take the larger one as the second target voltage amplitude, and the corresponding voltage phase angle as the second target voltage phase angle.

[0134] If both are less than U s , indicating that it is invalid and is not used as the second target voltage phase angle.

[0135] If Q<0, then V d3 and V d4 Respectively with U s Compare, if one of them is greater than U s , and the other is smaller than U s , then it will be less than U s One of the values ​​is used as the second target voltage amplitude, and the corresponding voltage phase angle is used as the second target voltage phase angle.

[0136] If both are less than U s , then V d3 and V d4 Compare them and take the smaller one as the second target voltage amplitude, and the corresponding voltage phase angle as the second target voltage phase angle.

[0137] If both are greater than U s , indicating that it is invalid and is not used as the second target voltage phase angle.

[0138] If V d3 and V d4 If both are less than 0, they are not used as the second target voltage phase angle.

[0139] The voltage calculation method for steady-state reactive power control provided in an embodiment of the present invention can set reactive output values ​​under different states when an external equivalent system network of a new energy equipment grid-connected point is obtained. The calculation method of the present invention can calculate the grid-connected voltage value of the reactive compensation device corresponding to different reactive output values, thereby accurately evaluating the supporting capacity of the reactive compensation device for the grid-connected power grid under steady-state reactive power measurement.

[0140] The voltage calculation method for steady-state reactive power control provided in an embodiment of the present invention calculates a first voltage amplitude to be determined based on the system equivalent voltage, equivalent impedance parameters and the first reactive power when there is no active branch at the grid-connected point; if it is determined that the first voltage amplitude to be determined is greater than zero, then the first target voltage amplitude and the first target voltage phase angle are calculated based on the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage, so that the grid-connected voltage of the reactive compensation device under different reactive value outputs can be accurately calculated.

[0141] Further, the first voltage amplitude to be determined is calculated based on the system equivalent voltage, the equivalent impedance parameter and the first reactive power when there is no active branch at the grid connection point, including:

[0142] The first resistance-inductance angle is calculated according to the equivalent impedance parameter and the angular frequency, and the first coefficient is calculated according to the first reactive power, the system equivalent voltage, the equivalent impedance parameter and the angular frequency; the description can be made with reference to the above embodiment and will not be repeated here.

[0143] The first voltage phase angle to be determined is calculated according to the first coefficient, the first resistance-inductance angle and the system equivalent voltage; the description may refer to the above embodiment and will not be repeated here.

[0144] If it is determined that the first voltage phase angle to be determined is within the first preset value interval, the first voltage amplitude to be determined is calculated based on the first voltage phase angle to be determined, the first coefficient and the first resistance-sensitivity angle.

[0145] Further, the calculating a first voltage phase angle to be determined according to the first coefficient, the first resistance-inductance angle and the system equivalent voltage includes:

[0146] The first voltage phase angle to be determined is calculated according to the following formula:

[0147]

[0148]

[0149] Wherein, θ1 is the first voltage phase angle value of the first voltage phase angle to be determined, θ2 is the second voltage phase angle value of the first voltage phase angle to be determined, V K1 is the first coefficient, α is the first resistance-sensing angle, U s The voltage amplitude of the system equivalent voltage can be referred to the above embodiment, which will not be described in detail.

[0150] Further, the calculating the first voltage amplitude to be determined according to the first voltage phase angle to be determined, the first coefficient and the first resistance-sensitivity angle includes:

[0151] The first voltage amplitude to be determined is calculated according to the following formula:

[0152]

[0153]

[0154] Among them, V d1 is the first voltage amplitude value of the first voltage amplitude to be determined, V d2 The second voltage phase angle value of the first voltage amplitude to be determined can be referred to the above embodiment for explanation and will not be described in detail.

[0155] Furthermore, the voltage calculation method for steady-state reactive power control also includes:

[0156] The second resistance-inductance angle is calculated based on the equivalent impedance parameter, the angular frequency, the second reactive power and the active power when an active branch exists at the grid-connected point, and the second coefficient is calculated based on the second reactive power, the system equivalent voltage, the equivalent impedance parameter, the second reactive power, the active power and the angular frequency; the description can be made with reference to the above embodiment and will not be repeated here.

[0157] The second voltage phase angle to be determined is calculated according to the second coefficient, the second resistance-inductance angle and the system equivalent voltage; the description may refer to the above embodiment and will not be repeated here.

[0158] If it is determined that the second voltage phase angle to be determined is within the second preset value range, the second voltage amplitude to be determined is calculated based on the second voltage phase angle to be determined, the second coefficient and the second resistance-inductance angle; the above embodiment can be referred to for description and will not be repeated here.

[0159] If it is determined that the second voltage amplitude to be determined is greater than zero, the second target voltage amplitude and the second target voltage phase angle are calculated according to the second voltage amplitude to be determined, the second reactive power, the second resistance-inductance angle and the voltage amplitude of the system equivalent voltage. The above description can be referred to and will not be repeated.

[0160] Further, the calculating a second voltage phase angle to be determined according to the second coefficient, the second resistance-inductance angle and the system equivalent voltage includes:

[0161] The second voltage phase angle to be determined is calculated according to the following formula:

[0162]

[0163]

[0164] Wherein, θ3 is the first voltage phase angle value of the second voltage phase angle to be determined, θ4 is the second voltage phase angle value of the second voltage phase angle to be determined, V K2 is the second coefficient, and α′ is the second resistance-sensing angle. The above description can be referred to, and will not be repeated here.

[0165] Further, the calculating the second voltage amplitude to be determined according to the second voltage phase angle to be determined, the second coefficient and the second resistance-inductance angle includes:

[0166] The second voltage amplitude to be determined is calculated according to the following formula:

[0167]

[0168]

[0169] Among them, V d3 is the first voltage amplitude value of the second voltage amplitude to be determined, V d4 The second voltage phase angle value of the second voltage amplitude to be determined can be referred to the above embodiment, which will not be described in detail.

[0170] Figure 5 FIG. 1 is a schematic diagram of a voltage calculation device for steady-state reactive power control provided by an embodiment of the present invention. Figure 5 As shown, the voltage calculation device for steady-state reactive power control provided by the embodiment of the present invention includes a first calculation unit 501 and a second calculation unit 502, wherein:

[0171] The first calculation unit 501 is used to calculate the first voltage amplitude to be determined based on the system equivalent voltage, equivalent impedance parameters and the first reactive power when there is no active branch at the grid connection point; the second calculation unit 502 is used to calculate the first target voltage amplitude and the first target voltage phase angle based on the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage if it is determined that the first voltage amplitude to be determined is greater than zero.

[0172] Specifically, the first calculation unit 501 in the device is used to calculate the first voltage amplitude to be determined based on the system equivalent voltage, equivalent impedance parameters and the first reactive power when there is no active branch at the grid connection point; the second calculation unit 502 is used to calculate the first target voltage amplitude and the first target voltage phase angle based on the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage if it is determined that the first voltage amplitude to be determined is greater than zero.

[0173] The voltage calculation device for steady-state reactive power control provided in an embodiment of the present invention calculates a first voltage amplitude to be determined based on the system equivalent voltage, equivalent impedance parameters and the first reactive power when there is no active branch at the grid-connected point; if it is determined that the first voltage amplitude to be determined is greater than zero, then the first target voltage amplitude and the first target voltage phase angle are calculated based on the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage, so that the grid-connected voltage of the reactive compensation device under different reactive value outputs can be accurately calculated.

[0174] Furthermore, the first calculation unit 501 is specifically configured to:

[0175] A first resistance-inductance angle is calculated according to the equivalent impedance parameter and the angular frequency, and a first coefficient is calculated according to the first reactive power, the system equivalent voltage, the equivalent impedance parameter and the angular frequency;

[0176] Calculate a first voltage phase angle to be determined according to the first coefficient, the first resistance-inductance angle and the system equivalent voltage;

[0177] If it is determined that the first voltage phase angle to be determined is within a first preset value interval, the first voltage amplitude to be determined is calculated according to the first voltage phase angle to be determined, the first coefficient and the first resistance-inductance angle.

[0178] Furthermore, the first calculating unit 501 is further specifically configured to:

[0179] The first voltage phase angle to be determined is calculated according to the following formula:

[0180]

[0181]

[0182] Wherein, θ1 is the first voltage phase angle value of the first voltage phase angle to be determined, θ2 is the second voltage phase angle value of the first voltage phase angle to be determined, V K1 is the first coefficient, α is the first resistance-sensing angle, U s is the voltage amplitude of the system equivalent voltage.

[0183] Furthermore, the first calculating unit 501 is further specifically configured to:

[0184] The first voltage amplitude to be determined is calculated according to the following formula:

[0185]

[0186]

[0187] Among them, V d1 is the first voltage amplitude value of the first voltage amplitude to be determined, V d2 is a second voltage phase angle value of the first voltage amplitude to be determined.

[0188] Furthermore, the voltage calculation device for steady-state reactive power control is also used for:

[0189] The second resistance-inductance angle is calculated according to the equivalent impedance parameter, the angular frequency, the second reactive power and the active power when an active branch exists at the grid connection point, and the second coefficient is calculated according to the second reactive power, the system equivalent voltage, the equivalent impedance parameter, the second reactive power, the active power and the angular frequency;

[0190] Calculate a second voltage phase angle to be determined according to the second coefficient, the second resistance-inductance angle and the system equivalent voltage;

[0191] If it is determined that the second voltage phase angle to be determined is within the second preset value interval, the second voltage amplitude to be determined is calculated according to the second voltage phase angle to be determined, the second coefficient and the second resistance-inductance angle;

[0192] If it is determined that the second voltage amplitude to be determined is greater than zero, the second target voltage amplitude and the second target voltage phase angle are calculated according to the second voltage amplitude to be determined, the second reactive power, the second resistance-inductance angle and the voltage amplitude of the system equivalent voltage.

[0193] Furthermore, the voltage calculation device for steady-state reactive power control is also specifically used for:

[0194] The second voltage phase angle to be determined is calculated according to the following formula:

[0195]

[0196]

[0197] Wherein, θ3 is the first voltage phase angle value of the second voltage phase angle to be determined, θ4 is the second voltage phase angle value of the second voltage phase angle to be determined, V K2is the second coefficient, and α′ is the second resistance-sensitivity angle.

[0198] Furthermore, the voltage calculation device for steady-state reactive power control is also specifically used for:

[0199] The second voltage amplitude to be determined is calculated according to the following formula:

[0200]

[0201]

[0202] Among them, V d3 is the first voltage amplitude value of the second voltage amplitude to be determined, V d4 is a second voltage phase angle value of the second voltage amplitude to be determined.

[0203] The embodiment of the voltage calculation device for steady-state reactive power control provided by the present invention can be specifically used to execute the processing flow of the above-mentioned method embodiments. Its functions are not repeated here, and reference can be made to the detailed description of the above-mentioned method embodiments.

[0204] Figure 6 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention, such as Figure 6 As shown, the electronic device includes: a processor (processor) 601, a memory (memory) 602 and a bus 603;

[0205] The processor 601 and the memory 602 communicate with each other via a bus 603;

[0206] The processor 601 is used to call the program instructions in the memory 602 to execute the methods provided by the above method embodiments, for example, including:

[0207] The first voltage amplitude to be determined is calculated based on the system equivalent voltage, the equivalent impedance parameter and the first reactive power when there is no active branch at the grid connection point;

[0208] If it is determined that the first voltage amplitude to be determined is greater than zero, a first target voltage amplitude and a first target voltage phase angle are calculated according to the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage.

[0209] This embodiment discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can perform the methods provided by the above method embodiments, for example, including:

[0210] The first voltage amplitude to be determined is calculated based on the system equivalent voltage, the equivalent impedance parameter and the first reactive power when there is no active branch at the grid connection point;

[0211] If it is determined that the first voltage amplitude to be determined is greater than zero, a first target voltage amplitude and a first target voltage phase angle are calculated according to the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage.

[0212] This embodiment provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, wherein the computer program enables the computer to execute the methods provided by the above method embodiments, for example, including:

[0213] The first voltage amplitude to be determined is calculated based on the system equivalent voltage, the equivalent impedance parameter and the first reactive power when there is no active branch at the grid connection point;

[0214] If it is determined that the first voltage amplitude to be determined is greater than zero, a first target voltage amplitude and a first target voltage phase angle are calculated according to the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage.

[0215] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0216] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0217] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0218] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0219] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0220] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A voltage calculation method for steady-state reactive power control, characterized in that: include: The first voltage amplitude to be determined is calculated based on the system equivalent voltage, the equivalent impedance parameter and the first reactive power when there is no active branch at the grid connection point; If it is determined that the first voltage amplitude to be determined is greater than zero, a first target voltage amplitude and a first target voltage phase angle are calculated according to the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage.

2. The voltage calculation method for steady-state reactive power control according to claim 1, characterized in that: The first voltage amplitude to be determined is calculated based on the system equivalent voltage, the equivalent impedance parameter and the first reactive power when there is no active branch at the grid connection point, including: A first resistance-inductance angle is calculated according to the equivalent impedance parameter and the angular frequency, and a first coefficient is calculated according to the first reactive power, the system equivalent voltage, the equivalent impedance parameter and the angular frequency; Calculate a first voltage phase angle to be determined according to the first coefficient, the first resistance-inductance angle and the system equivalent voltage; If it is determined that the first voltage phase angle to be determined is within a first preset value interval, the first voltage amplitude to be determined is calculated according to the first voltage phase angle to be determined, the first coefficient and the first resistance-inductance angle.

3. The voltage calculation method for steady-state reactive power control according to claim 2, characterized in that: The step of calculating a first voltage phase angle to be determined according to the first coefficient, the first resistance-inductance angle and the system equivalent voltage includes: The first voltage phase angle to be determined is calculated according to the following formula: Wherein, θ1 is the first voltage phase angle value of the first voltage phase angle to be determined, θ2 is the second voltage phase angle value of the first voltage phase angle to be determined, V K1 is the first coefficient, α is the first resistance-sensing angle, U s is the voltage amplitude of the system equivalent voltage.

4. The voltage calculation method for steady-state reactive power control according to claim 3 is characterized in that: The step of calculating the first voltage amplitude to be determined according to the first voltage phase angle to be determined, the first coefficient and the first resistance-sensitivity angle includes: The first voltage amplitude to be determined is calculated according to the following formula: Among them, V d1 is the first voltage amplitude value of the first voltage amplitude to be determined, V d2 is a second voltage phase angle value of the first voltage amplitude to be determined.

5. The voltage calculation method for steady-state reactive power control according to claim 4, characterized in that: The voltage calculation method for steady-state reactive power control also includes: The second resistance-inductance angle is calculated according to the equivalent impedance parameter, the angular frequency, the second reactive power and the active power when an active branch exists at the grid connection point, and the second coefficient is calculated according to the second reactive power, the system equivalent voltage, the equivalent impedance parameter, the second reactive power, the active power and the angular frequency; Calculate a second voltage phase angle to be determined according to the second coefficient, the second resistance-inductance angle and the system equivalent voltage; If it is determined that the second voltage phase angle to be determined is within the second preset value interval, the second voltage amplitude to be determined is calculated according to the second voltage phase angle to be determined, the second coefficient and the second resistance-inductance angle; If it is determined that the second voltage amplitude to be determined is greater than zero, the second target voltage amplitude and the second target voltage phase angle are calculated according to the second voltage amplitude to be determined, the second reactive power, the second resistance-inductance angle and the voltage amplitude of the system equivalent voltage.

6. The voltage calculation method for steady-state reactive power control according to claim 5, characterized in that: The step of calculating a second voltage phase angle to be determined according to the second coefficient, the second resistance-inductance angle and the system equivalent voltage comprises: The second voltage phase angle to be determined is calculated according to the following formula: Wherein, θ3 is the first voltage phase angle value of the second voltage phase angle to be determined, θ4 is the second voltage phase angle value of the second voltage phase angle to be determined, V K2 is the second coefficient, and α′ is the second resistance-sensitivity angle.

7. The voltage calculation method for steady-state reactive power control according to claim 6, characterized in that: The step of calculating the second voltage amplitude to be determined according to the second voltage phase angle to be determined, the second coefficient and the second resistance-inductance angle comprises: The second voltage amplitude to be determined is calculated according to the following formula: Among them, V d3 is the first voltage amplitude value of the second voltage amplitude to be determined, V d4 is a second voltage phase angle value of the second voltage amplitude to be determined.

8. A voltage calculation device for steady-state reactive power control, characterized in that: include: A first calculation unit, configured to calculate a first voltage amplitude to be determined based on a system equivalent voltage, an equivalent impedance parameter, and a first reactive power when no active branch exists at a grid connection point; The second calculation unit is used to calculate a first target voltage amplitude and a first target voltage phase angle according to the first voltage amplitude to be determined, the first reactive power and the voltage amplitude of the system equivalent voltage if it is determined that the first voltage amplitude to be determined is greater than zero.

9. The voltage calculation device for steady-state reactive power control according to claim 8, characterized in that: The first computing unit is specifically configured to: A first resistance-inductance angle is calculated according to the equivalent impedance parameter and the angular frequency, and a first coefficient is calculated according to the first reactive power, the system equivalent voltage, the equivalent impedance parameter and the angular frequency; Calculate a first voltage phase angle to be determined according to the first coefficient, the first resistance-inductance angle and the system equivalent voltage; If it is determined that the first voltage phase angle to be determined is within a first preset value interval, the first voltage amplitude to be determined is calculated according to the first voltage phase angle to be determined, the first coefficient and the first resistance-inductance angle.

10. The voltage calculation device for steady-state reactive power control according to claim 9, characterized in that: The first computing unit is further specifically configured to: The first voltage phase angle to be determined is calculated according to the following formula: Wherein, θ1 is the first voltage phase angle value of the first voltage phase angle to be determined, θ2 is the second voltage phase angle value of the first voltage phase angle to be determined, V K1 is the first coefficient, α is the first resistance-sensing angle, U s is the voltage amplitude of the system equivalent voltage.

11. The voltage calculation device for steady-state reactive power control according to claim 10, characterized in that: The first computing unit is further specifically configured to: The first voltage amplitude to be determined is calculated according to the following formula: Among them, V d1 is the first voltage amplitude value of the first voltage amplitude to be determined, V d2 is a second voltage phase angle value of the first voltage amplitude to be determined.

12. The voltage calculation device for steady-state reactive power control according to claim 11, characterized in that: The voltage calculation device for steady-state reactive power control is also used for: The second resistance-inductance angle is calculated according to the equivalent impedance parameter, the angular frequency, the second reactive power and the active power when an active branch exists at the grid connection point, and the second coefficient is calculated according to the second reactive power, the system equivalent voltage, the equivalent impedance parameter, the second reactive power, the active power and the angular frequency; Calculate a second voltage phase angle to be determined according to the second coefficient, the second resistance-inductance angle and the system equivalent voltage; If it is determined that the second voltage phase angle to be determined is within the second preset value interval, the second voltage amplitude to be determined is calculated according to the second voltage phase angle to be determined, the second coefficient and the second resistance-inductance angle; If it is determined that the second voltage amplitude to be determined is greater than zero, the second target voltage amplitude and the second target voltage phase angle are calculated according to the second voltage amplitude to be determined, the second reactive power, the second resistance-inductance angle and the voltage amplitude of the system equivalent voltage.

13. The voltage calculation device for steady-state reactive power control according to claim 12, characterized in that: The voltage calculation device for steady-state reactive power control is also specifically used for: The second voltage phase angle to be determined is calculated according to the following formula: Wherein, θ3 is the first voltage phase angle value of the second voltage phase angle to be determined, θ4 is the second voltage phase angle value of the second voltage phase angle to be determined, V K2 is the second coefficient, and α′ is the second resistance-sensitivity angle.

14. The voltage calculation device for steady-state reactive power control according to claim 13, characterized in that: The voltage calculation device for steady-state reactive power control is also specifically used for: The second voltage amplitude to be determined is calculated according to the following formula: Among them, V d3 is the first voltage amplitude value of the second voltage amplitude to be determined, V d4 is a second voltage phase angle value of the second voltage amplitude to be determined.

15. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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