Capacitance determination method and apparatus, computer device, and storage medium

Abstract

This disclosure relates to a method, apparatus, computer device, storage medium, and computer program product for determining capacitor capacity. The method includes: acquiring a first physical parameter of the AC voltage source, a second physical parameter between the single-phase bridge uncontrolled rectifier circuit and the AC voltage source, and a third physical parameter of a single diode in the single-phase bridge uncontrolled rectifier circuit; determining a fourth physical parameter of the load based on the first, second, and third physical parameters; and determining the capacity of the energy storage capacitor based on the first, second, and fourth physical parameters. This method can accurately obtain the capacity of the energy storage capacitor, enabling timely monitoring of circuit status or abnormal information.

Description

Technical Field

[0001] This disclosure relates to the field of power grid energy storage detection technology, and in particular to a method, apparatus, computer equipment, and storage medium for determining capacitor capacity. Background Technology

[0002] In recent years, the proportion of power supplied by switching power supplies in the total power transmitted by power supply systems has been gradually increasing. Uncontrolled rectifier circuits are widely used in switching power supplies. Typically, a rectifier circuit converts alternating current (AC) into pulsating direct current (DC). To reduce the pulsation, a capacitor is connected after the rectifier circuit. The capacitor's charging and discharging characteristics are used to convert the pulsating DC voltage into a relatively stable DC voltage. Therefore, the amount of energy stored in the capacitor affects the circuit's operating state.

[0003] However, existing methods for detecting capacitance require data on the geometry of the capacitor plates, the amount of charge, or the load, which limits their applicability. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, apparatus, computer equipment, and storage medium that can directly determine the capacitance based on grid-side parameters to address the aforementioned technical problems.

[0005] In a first aspect, embodiments of this disclosure provide a method for determining capacitor capacity. The method is applied to a single-phase bridge uncontrolled rectifier circuit, wherein the input terminal of the single-phase bridge uncontrolled rectifier circuit is electrically connected to an AC voltage source via a resistor and an inductor, and the output terminal of the single-phase bridge uncontrolled rectifier circuit is electrically connected to an energy storage capacitor and a load, comprising:

[0006] Obtain the first physical parameters of the AC voltage source, the second physical parameters between the single-phase bridge uncontrolled rectifier circuit and the AC voltage source, and the third physical parameters of a single diode in the single-phase bridge uncontrolled rectifier circuit;

[0007] The fourth physical parameter of the load is determined based on the first physical parameter, the second physical parameter, and the third physical parameter;

[0008] The capacity of the energy storage capacitor is determined based on the first physical parameter, the second physical parameter, and the fourth physical parameter.

[0009] In one embodiment, determining the fourth physical parameter of the load based on the first physical parameter, the second physical parameter, and the third physical parameter includes:

[0010] The load power loss is determined based on the second physical parameter and the third physical parameter;

[0011] The fourth physical parameter of the load is determined based on the first physical parameter, the second physical parameter, the third physical parameter, and the load power loss.

[0012] In one embodiment, the second physical parameter includes the active power across the AC voltage source, and determining the load power loss based on the second physical parameter includes:

[0013] The power loss of the resistor before the single-phase bridge uncontrolled rectifier circuit is determined based on the second physical parameter.

[0014] The total diode power loss is determined based on the second physical parameter and the third physical parameter.

[0015] The load power loss is determined based on the active power, the resistor power loss, and the total diode power loss.

[0016] In one embodiment, the second physical parameter includes the resistance value between the AC voltage source and the single-phase bridge uncontrolled rectifier circuit and the effective current value at the input terminal of the single-phase bridge uncontrolled rectifier circuit. Determining the resistive power loss before the single-phase bridge uncontrolled rectifier circuit based on the second physical parameter includes:

[0017] The product of the square of the resistance value and the effective value of the current is determined as the power loss of the resistor before the single-phase bridge uncontrolled rectifier circuit.

[0018] In one embodiment, the second physical parameter includes the effective value of the current at the input terminal of the single-phase bridge uncontrolled rectifier circuit, and the third physical parameter includes the slope resistance of the diode. Determining the total diode power loss based on the second physical parameter and the third physical parameter includes:

[0019] The current value passing through the diode is determined based on the effective value of the current.

[0020] The total diode power loss is determined based on the current value passing through the diode and the slope resistor.

[0021] In one embodiment, the first physical parameter includes the effective voltage value of the voltage source, the second physical parameter includes the resistance and inductance values ​​between the AC voltage source and the single-phase bridge uncontrolled rectifier circuit, and the third physical parameter includes the slope resistance and forward voltage of the diode. Determining the fourth physical parameter of the load based on the first, second, and third physical parameters includes:

[0022] Determine the equivalent resistance of the circuits at both ends of the load based on the resistance value and the slope resistance;

[0023] The equivalent impedance of the circuit at both ends of the load is determined based on the equivalent resistance and the inductance value.

[0024] The port voltage is determined based on the effective voltage value and the on-state voltage;

[0025] The fourth physical parameter of the load is determined based on the equivalent impedance, the port voltage, and the second physical parameter.

[0026] In one embodiment, the first physical parameter further includes the period of the AC voltage source, and the second physical parameter further includes the effective value of the voltage at the input terminal of the single-phase bridge uncontrolled rectifier circuit. Determining the capacity of the energy storage capacitor based on the first physical parameter, the second physical parameter, and the fourth physical parameter includes:

[0027] Obtain the output voltage equation of the capacitor filter circuit;

[0028] The capacity of the energy storage capacitor is determined by substituting the period, the effective value of the voltage, and the fourth physical parameter into the output voltage equation.

[0029] Secondly, embodiments of this disclosure also provide a device for determining capacitor capacity. The device is applied to a single-phase bridge uncontrolled rectifier circuit, wherein the input terminal of the single-phase bridge uncontrolled rectifier circuit is electrically connected to an AC voltage source via a resistor and an inductor, and the output terminal of the single-phase bridge uncontrolled rectifier circuit is electrically connected to an energy storage capacitor and a load, comprising:

[0030] The acquisition module is used to acquire the first physical parameters of the AC voltage source, the second physical parameters between the single-phase bridge uncontrolled rectifier circuit and the AC voltage source, and the third physical parameters of a single diode in the single-phase bridge uncontrolled rectifier circuit.

[0031] The first determining module is used to determine the fourth physical parameter of the load based on the first physical parameter, the second physical parameter, and the third physical parameter;

[0032] The second determining module is used to determine the capacity of the energy storage capacitor based on the first physical parameter, the second physical parameter and the fourth physical parameter.

[0033] In one embodiment, the first determining module includes:

[0034] The first determining submodule is used to determine the load power loss based on the second physical parameter and the third physical parameter;

[0035] The second determining submodule is used to determine the fourth physical parameter of the load based on the first physical parameter, the second physical parameter, the third physical parameter and the load power loss.

[0036] In one embodiment, the second physical parameter includes the active power across the AC voltage source, and the first determining submodule includes:

[0037] The first determining unit is used to determine the resistive power loss before the single-phase bridge uncontrolled rectifier circuit based on the second physical parameters.

[0038] The second determining unit is used to determine the total diode power loss based on the second physical parameter and the third physical parameter;

[0039] The third determining unit is used to determine the load power loss based on the active power, the resistor power loss, and the total diode power loss.

[0040] In one embodiment, the second physical parameter includes the resistance value between the AC voltage source and the single-phase bridge uncontrolled rectifier circuit and the effective current value at the input terminal of the single-phase bridge uncontrolled rectifier circuit. The first determining unit includes:

[0041] The first determining subunit is used to determine the product of the square of the resistance value and the effective value of the current as the resistance power loss before the single-phase bridge uncontrolled rectifier circuit.

[0042] In one embodiment, the second physical parameter includes the effective value of the current at the input terminal of the single-phase bridge uncontrolled rectifier circuit, the third physical parameter includes the slope resistance of the diode, and the second determining unit includes:

[0043] The first determining subunit is used to determine the current value passing through the diode based on the effective value of the current;

[0044] The second determining subunit is used to determine the total diode power loss based on the current value passing through the diode and the slope resistor.

[0045] In one embodiment, the first physical parameter includes the effective voltage value of the voltage source, the second physical parameter includes the resistance and inductance values ​​between the AC voltage source and the single-phase bridge uncontrolled rectifier circuit, and the third physical parameter includes the slope resistance and forward voltage of the diode. The first determining module includes:

[0046] The first determining submodule is used to determine the equivalent resistance corresponding to the circuit at both ends of the load based on the resistance value and the slope resistance.

[0047] The second determining submodule is used to determine the equivalent impedance corresponding to the circuit at both ends of the load based on the equivalent resistance and the inductance value.

[0048] The third determining submodule is used to determine the port voltage based on the effective voltage value and the conduction voltage;

[0049] The fourth determining submodule is used to determine the fourth physical parameter of the load based on the equivalent impedance, the port voltage, and the second physical parameter.

[0050] In one embodiment, the first physical parameter further includes the period of the AC voltage source, and the second physical parameter further includes the effective value of the voltage at the input terminal of the single-phase bridge uncontrolled rectifier circuit. The second determining module includes:

[0051] The acquisition submodule is used to obtain the output voltage equation of the capacitor filter circuit.

[0052] The determination submodule is used to substitute the period, the effective value of the voltage, and the fourth physical parameter into the output voltage equation to determine the capacity of the energy storage capacitor.

[0053] Thirdly, embodiments of this disclosure also provide a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method described in any one of the embodiments of this disclosure.

[0054] Fourthly, embodiments of this disclosure also provide a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements the steps of the method described in any one of the embodiments of this disclosure.

[0055] Fifthly, embodiments of this disclosure also provide a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the steps of the method described in any one of the embodiments of this disclosure.

[0056] In this embodiment of the power supply system, in a switching power supply using a single-phase bridge uncontrolled rectifier circuit, the physical parameters of the AC voltage source, the physical parameters between the uncontrolled rectifier circuit and the AC voltage source, and the physical parameters of a single diode in the uncontrolled rectifier circuit are first obtained. Based on the obtained physical parameters, the physical parameters corresponding to the load are determined. Thus, the capacity of the energy storage capacitor can be determined based on the physical parameters of the AC voltage source, the physical parameters between the uncontrolled rectifier circuit and the AC voltage source, and the physical parameters corresponding to the load. This realizes the direct determination of the output energy storage capacitor size through the parameters of the input terminal of the uncontrolled rectifier circuit, without the need to obtain the parameters of the capacitor or load. The operation is simple, the application range is wide, and maintenance personnel can judge the working state of the circuit based on the energy storage capacity of the energy storage capacitor, thereby improving the stability and safety of the circuit. Attached Figure Description

[0057] Figure 1 This is a flowchart illustrating a method for determining capacitor capacity in one embodiment;

[0058] Figure 2 This is a graph showing the change of grid-side active power with the size of capacitor energy storage in one embodiment;

[0059] Figure 3 This is a flowchart illustrating a method for determining capacitor capacity in one embodiment;

[0060] Figure 4 This is a flowchart illustrating a method for determining capacitor capacity in one embodiment;

[0061] Figure 5 This is a simulation diagram of a single-phase bridge uncontrolled rectifier circuit in one embodiment;

[0062] Figure 6 This is a structural block diagram of a device for determining capacitance in one embodiment;

[0063] Figure 7 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of this disclosure and are not intended to limit the embodiments of this disclosure.

[0065] In one embodiment, such as Figure 1 As shown, a method for determining capacitor capacity is provided. This method is applied to a single-phase bridge uncontrolled rectifier circuit. The input terminal of the single-phase bridge uncontrolled rectifier circuit is electrically connected to an AC voltage source through a resistor and an inductor. The output terminal of the single-phase bridge uncontrolled rectifier circuit is electrically connected to an energy storage capacitor and a load.

[0066] Step S110: Obtain the first physical parameters of the AC voltage source, the second physical parameters between the single-phase bridge uncontrolled rectifier circuit and the AC voltage source, and the third physical parameters of a single diode in the single-phase bridge uncontrolled rectifier circuit.

[0067] In this embodiment, the physical parameters of the AC voltage source, the physical parameters between the single-phase bridge uncontrolled rectifier circuit and the AC voltage source, and the physical parameters of a single diode in the single-phase bridge uncontrolled rectifier circuit are obtained. In one example, the physical parameters typically include circuit parameters such as voltage, current, resistance, and power. These physical parameters can be obtained directly from the inherent parameters of the components or from data measured on-site. The single-phase bridge uncontrolled rectifier circuit typically includes four diodes, and the physical parameters of the four diodes are identical.

[0068] Step S120: Determine the fourth physical parameter of the load based on the first physical parameter, the second physical parameter, and the third physical parameter;

[0069] In this embodiment of the disclosure, after obtaining the physical parameters, the physical parameters corresponding to the load are determined based on the relationship between the resistance, voltage, current and power in the circuit. The physical parameters corresponding to the load typically include the load voltage, the load current and the equivalent resistance of the load.

[0070] Step S130: Determine the capacity of the energy storage capacitor based on the first physical parameter, the second physical parameter, and the fourth physical parameter.

[0071] In this embodiment of the disclosure, after determining the physical parameters corresponding to the load, the capacity of the energy storage capacitor is determined by the relationship between the resistance, voltage, current and power in the circuit, based on the physical parameters of the AC voltage source, the physical parameters between the uncontrolled rectifier circuit and the AC voltage source, and the physical parameters corresponding to the load.

[0072] In one example, the impact of capacitor energy storage size on grid-side active power is as follows: Figure 2 As shown in the figure, the size of the energy storage capacitor has a significant impact on the active power on the grid side. Therefore, it is necessary to accurately calculate the DC-side energy storage capacitor in order to obtain circuit status and abnormal information in a timely manner and improve circuit stability.

[0073] In this embodiment of the power supply system, in a switching power supply using a single-phase bridge uncontrolled rectifier circuit, the physical parameters of the AC voltage source, the physical parameters between the uncontrolled rectifier circuit and the AC voltage source, and the physical parameters of a single diode in the uncontrolled rectifier circuit are first obtained. Based on the obtained physical parameters, the physical parameters corresponding to the load are determined. Thus, the capacity of the energy storage capacitor can be determined based on the physical parameters of the AC voltage source, the physical parameters between the uncontrolled rectifier circuit and the AC voltage source, and the physical parameters corresponding to the load. This realizes the direct determination of the output energy storage capacitor capacity through the parameters of the input terminal of the uncontrolled rectifier circuit, without the need to obtain the parameters of the capacitor or the load. The operation is simple, the application range is wide, and maintenance personnel can judge the working state of the circuit based on the energy storage capacity of the energy storage capacitor, thereby improving the stability and safety of the circuit.

[0074] In one embodiment, such as Figure 3 As shown, determining the fourth physical parameter of the load based on the first physical parameter, the second physical parameter, and the third physical parameter includes:

[0075] Step S121: Determine the load power loss based on the second physical parameter and the third physical parameter;

[0076] Step S122: Determine the fourth physical parameter of the load based on the first physical parameter, the second physical parameter, the third physical parameter, and the load power loss.

[0077] In this embodiment of the disclosure, when determining the physical parameters of the load based on the obtained physical parameters, the power loss corresponding to the load can first be determined based on the physical parameters between the single-phase bridge uncontrolled rectifier circuit and the AC voltage source, and the physical parameters of the diodes. The physical parameters corresponding to the load are determined based on the obtained physical parameters of the AC voltage source, the physical parameters between the single-phase bridge uncontrolled rectifier circuit and the AC voltage source, the physical parameters of a single diode, and the power loss corresponding to the load. The physical parameters corresponding to the load typically include the load current, the load voltage, and the load's equivalent resistance.

[0078] In this embodiment, the power loss corresponding to the load is determined by the physical parameters between the rectifier circuit and the voltage source. Then, the physical parameters corresponding to the load are determined by the power loss corresponding to the load and the obtained physical parameters. This realizes the determination of the physical parameters corresponding to the load based on the circuit parameters before the output of the uncontrolled rectifier circuit. It does not require obtaining the load parameters, is simple to operate, and has a wide range of applications.

[0079] In one embodiment, the second physical parameter includes the active power across the AC voltage source, and determining the load power loss based on the second physical parameter includes:

[0080] The power loss of the resistor before the single-phase bridge uncontrolled rectifier circuit is determined based on the second physical parameter.

[0081] The total diode power loss is determined based on the second physical parameter and the third physical parameter.

[0082] The load power loss is determined based on the active power, the resistor power loss, and the total diode power loss.

[0083] In this embodiment, the physical parameters between the uncontrolled rectifier circuit and the AC voltage source include the active power at both ends of the voltage source. When determining the load power loss, the resistive power loss between the uncontrolled rectifier circuit and the AC voltage source is first determined based on the physical parameters between them. Then, the total diode power loss in the uncontrolled rectifier circuit is determined based on the physical parameters of the diodes in the uncontrolled rectifier circuit. The load power loss is determined based on the active power at both ends of the AC voltage source, the resistive power loss, and the total diode power loss in the uncontrolled rectifier circuit. According to basic circuit principles, under ideal conditions, as shown in equation (1), the load power loss P... d It equals the active power P1 minus the resistive power loss ΔP TR Total diode power loss ΔP VD .

[0084] P d =P1-ΔP TR -ΔP VD4 (1)

[0085] In this embodiment, the power loss of the resistor and the total power loss of the diode are determined by the obtained physical parameters, and the power loss of the load is determined based on the active power, the power loss of the resistor, and the total power loss of the diode. This realizes the determination of the circuit parameters on the load side based on the circuit parameters before the uncontrolled rectifier circuit, thereby enabling the calculation of the physical parameters corresponding to the load, and has a wide range of applications.

[0086] In one example, the second physical parameter includes the resistance value between the AC voltage source and the single-phase bridge uncontrolled rectifier circuit and the effective current value at the input terminal of the single-phase bridge uncontrolled rectifier circuit. Determining the resistive power loss before the single-phase bridge uncontrolled rectifier circuit based on the second physical parameter includes:

[0087] The product of the square of the resistance value and the effective value of the current is determined as the power loss of the resistor before the single-phase bridge uncontrolled rectifier circuit.

[0088] In this embodiment of the disclosure, the second physical parameter includes the resistance value R between the AC voltage source and the input terminal of the single-phase bridge uncontrolled rectifier circuit. TAnd the effective value of the current I at the input terminal of the uncontrolled rectifier circuit. 2RMS Based on the relationship between power, resistance, and current, as shown in equation (2), the product of the square of the resistance value and the effective value of the current is determined as the resistance power loss ΔP before the input terminal of the single-phase bridge uncontrolled rectifier circuit. TR .

[0089]

[0090] In this embodiment of the disclosure, by obtaining the resistance value between the AC voltage source and the uncontrolled rectifier circuit and the effective value of the current at the input terminal of the uncontrolled rectifier circuit, the resistance power loss before the uncontrolled rectifier circuit can be determined, thereby enabling the subsequent further determination of the load power loss.

[0091] In one embodiment, the second physical parameter includes the effective value of the current at the input terminal of the single-phase bridge uncontrolled rectifier circuit, and the third physical parameter includes the slope resistance of the diode. Determining the total diode power loss based on the second physical parameter and the third physical parameter includes:

[0092] The current value passing through the diode is determined based on the effective value of the current.

[0093] The total diode power loss is determined based on the current value passing through the diode and the slope resistor.

[0094] In this embodiment of the disclosure, the second physical parameter includes the effective value I of the current at the input terminal of the uncontrolled rectifier circuit. 2RMS The third physical parameter includes the diode's slope resistance r. T When determining the total diode power loss, the current value passing through the diode is determined based on the effective value of the current at the input terminal of the uncontrolled rectifier circuit. Based on the relationship between resistance, current, and power, as shown in equation (3), the power loss of a single diode is determined according to the current value through the diode and the slope resistance of the diode, and the total power loss ΔP of the diodes in the uncontrolled rectifier circuit is determined according to the power loss of the single diode. VD .

[0095]

[0096] This disclosure embodiment enables the determination of the total diode power loss in an uncontrolled rectifier circuit by acquiring physical parameters, thereby enabling the subsequent acquisition of the load power loss.

[0097] In one embodiment, the first physical parameter includes the effective voltage value of the voltage source, the second physical parameter includes the resistance and inductance values ​​between the AC voltage source and the single-phase bridge uncontrolled rectifier circuit, and the third physical parameter includes the slope resistance and forward voltage of the diode. Determining the fourth physical parameter of the load based on the first, second, and third physical parameters includes:

[0098] Determine the equivalent resistance of the circuits at both ends of the load based on the resistance value and the slope resistance;

[0099] The equivalent impedance of the circuit at both ends of the load is determined based on the equivalent resistance and the inductance value.

[0100] The port voltage is determined based on the effective voltage value and the on-state voltage;

[0101] The fourth physical parameter of the load is determined based on the equivalent impedance, the port voltage, and the second physical parameter.

[0102] In this embodiment of the disclosure, the obtained physical parameters include the effective voltage value V of the voltage source. 20 The resistance value R between the AC voltage source and the input terminal of the uncontrolled rectifier circuit T And the inductance value LT, the slope resistance r of the diode T and the on-state voltage V F According to the basic circuit principle, as shown in equation (4), the equivalent resistance R in the circuit corresponding to the load terminals is determined based on the resistance value between the AC voltage source and the input terminal of the uncontrolled rectifier circuit and the slope resistance value of the diode. sum Then, based on the equivalent resistance and inductance values, determine the equivalent impedance Z corresponding to the circuit at both ends of the load. sum The port voltage V corresponding to the load terminals is determined based on the effective value of the AC voltage source and the forward voltage of the diode. d0 Finally, the physical parameters corresponding to the load are determined based on the obtained equivalent impedance, port voltage, and second physical parameter. In one example, as shown in equation (5), a system of equations is established and solved to obtain the average load voltage V. dAVG and load equivalent resistance R load .

[0103] R sum =R T +2*r T (4)

[0104]

[0105] This embodiment treats the circuits at both ends of the load as a whole, determines the equivalent impedance and port voltage of the circuit, and finally determines the physical parameters of the load. It takes into account the influence of circuit impedance, improves the accuracy of subsequent capacitance calculation, and has strong applicability and wide application range.

[0106] In one embodiment, the first physical parameter further includes the period of the AC voltage source, and the second physical parameter further includes the effective value of the voltage at the input terminal of the single-phase bridge uncontrolled rectifier circuit. Determining the capacity of the energy storage capacitor based on the first physical parameter, the second physical parameter, and the fourth physical parameter includes:

[0107] Obtain the output voltage equation of the capacitor filter circuit;

[0108] The capacity of the energy storage capacitor is determined by substituting the period, the effective value of the voltage, and the fourth physical parameter into the output voltage equation.

[0109] In this embodiment, the period of the AC voltage source and the effective voltage value at the input terminal of the uncontrolled rectifier circuit are also obtained. The circuit in this embodiment is a capacitor filter circuit. Therefore, the output voltage formula of the capacitor filter circuit is obtained as shown in equation (6). The frequency of the AC voltage source is determined according to the period of the AC voltage source. The frequency, the effective voltage value, and the physical parameters corresponding to the load are substituted into the output voltage equation to determine the capacity of the energy storage capacitor.

[0110]

[0111] In this embodiment, the capacity of the energy storage capacitor is determined by the output voltage equation of the capacitor filter circuit. This allows the capacity of the energy storage capacitor to be determined directly based on the parameters without the need for a load or capacitor plate. It has a wide range of applications, is simple to operate, and helps maintenance personnel to obtain the circuit status in a timely and accurate manner, thereby improving the stability and safety of the circuit.

[0112] Figure 4 This is a schematic diagram illustrating a method for determining capacitor capacity according to an exemplary embodiment, see reference. Figure 4 As shown, the method is applied to a single-phase bridge uncontrolled rectifier circuit without PFC. Based on design requirements or field test data, the frequency f and effective value V of the AC voltage source are obtained. 20 Grid-side inductance and resistance L T R T Diode slope resistance r T , conduction voltage V F The measured active power on the incoming side is P1, and the effective value of the AC side voltage is V. 2RMS and the effective value of the current I 2RMS ; Calculate the power loss ΔP of the grid-side resistance. TRand diode loss ΔP VD Alternating current cycle Power loss of grid-side resistor The root mean square current through the diode During the positive half-cycle of the AC input voltage, two diodes conduct; during the negative half-cycle, the other two diodes conduct. Diode power loss... The active power loss P of the load is obtained by establishing an active power balance. d =P1-ΔP TR -ΔP VD4 ; Calculate the load voltage V dAVG Load current I d and load resistance R load Under no-load conditions, the equivalent resistance R of a single-phase bridge rectifier circuit is as follows: (Currently, the DC side is the input port.) sum =R T +2*r T Circuit equivalent impedance Where X T For the network side resistance, X T =2π*f*L T Port voltage Under load conditions, the equivalent resistance of the load is R. load The average load voltage is V dAVG Through the system of equations The average load voltage V can be calculated. dAVG and load equivalent resistance R load For capacitor filter circuits, the engineering algorithm for output voltage is as follows: but V dAVG V 2RMS and R load Substituting into the above formula, the value of C can be obtained. Through the embodiments of this disclosure, the DC-side energy storage capacity can be calculated by measuring the grid-connected parameters of the rectifier circuit. Simultaneously, the DC-side circuit parameters can also be calculated, allowing for the identification of problems by checking the circuit parameters when abnormal circuit operation occurs.

[0113] In one embodiment, such as Figure 5 As shown, simulations can be performed using Matlab / Simulink. The voltage source frequency is 50Hz, the effective voltage is 25V, the grid-side resistance is 0.26Ω, the inductive reactance is 0.23Ω, the diode forward voltage is 1.25V, and the slope resistance is 0.055Ω. The filter capacitor is set to 16500μF, and the load resistance is 1.82Ω, which meets the requirements. All units in the formulas are in the International System of Units (SI). Measurement module 1 is used to obtain the active power output of the AC voltage source; measurement module 2 is used to obtain the effective voltage value of the AC input side of the uncontrolled rectifier circuit; measurement module 3 is used to obtain the voltage value across the load; measurement module 4 is used to obtain the current value flowing through the load; measurement module 5 is used to obtain the current value of the DC output side of the uncontrolled rectifier circuit; and measurement module 6 is used to obtain the effective current value of the AC input side of the uncontrolled rectifier circuit. The DC side energy storage capacity is estimated using the input side data and compared with the set capacitance value. First, the active power output of the AC voltage source is measured using measurement module 1, i.e., the active power on the input side P1 = 363.2W, and the effective current value on the AC side I... 2RMS =16A, effective voltage V 2RMS =20V.

[0114] Calculate grid-side resistance power loss RMS current through the diode The active power loss ΔP of a single diode VD1 =7.04W, then the active power loss of the diode ΔP VD4 =4*ΔP VD1 =28.2W. Ignoring capacitor losses, the load loss P is obtained. d =P1-ΔP TR -ΔP VD4 =268W.

[0115] Total circuit resistance R sum =R T +2*r T =0.37Ω, total impedance Peak voltage of AC voltage source Capacitor voltage V under no load d0 =V 2PK -2*V F =32.9V, load resistance according to V can be calculated dAVG =22.4V, load current

[0116] Finally, substitute the calculated value into... The capacitance C = 15400μF can be obtained from this.

[0117] The calculation results were compared with the simulation results, and the results are shown in Table 1:

[0118] Table 1

[0119] <![CDATA[I d / A]]> <![CDATA[V dAVG / V]]> <![CDATA[R load / Oh]]> C / μF Calculated value 11.9 22.4 1.87 15400 Simulation values 11.2 22.1 1.82 16500 error 6.3％ 1.4％ 2.7％ -6.7％

[0120] By comparison, it can be concluded that the voltage value obtained using the embodiments of this disclosure has an error range of 2%, the current value has an error range of 7%, the load resistance value has an error range of 3%, and the capacitor has an error range of about 7%.

[0121] Simulation results show that the DC-side capacitor energy storage capacity obtained using the embodiments of this disclosure is close to the actual capacitor energy storage capacity. Furthermore, the calculation method is simple, and results can be quickly obtained when circuit parameters change. It also allows for the determination of various circuit parameters, enabling problem identification by checking these parameters when the circuit malfunctions. The embodiments of this disclosure can estimate the DC-side energy storage capacity using grid-side circuit parameters with high accuracy and strong practicality.

[0122] It should be understood that although the steps in the flowcharts of the accompanying drawings are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the accompanying drawings may include multiple steps or stages, which are not necessarily completed at the same time, but may be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but may be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0123] Based on the same inventive concept, this disclosure also provides a capacitor capacity determining apparatus for implementing the capacitor capacity determining method described above. The solution provided by this apparatus is similar to the solution described in the above method; therefore, the specific limitations in one or more embodiments of the capacitor capacity determining apparatus provided below can be found in the limitations of the capacitor capacity determining method described above, and will not be repeated here.

[0124] In one embodiment, such as Figure 6 As shown, a device for determining capacitor capacity is provided. This device is applied to a single-phase bridge uncontrolled rectifier circuit. The input terminal of the single-phase bridge uncontrolled rectifier circuit is electrically connected to an AC voltage source via a resistor and an inductor. The output terminal of the single-phase bridge uncontrolled rectifier circuit is electrically connected to an energy storage capacitor and a load. The device includes:

[0125] The acquisition module 610 is used to acquire the first physical parameters of the AC voltage source, the second physical parameters between the single-phase bridge uncontrolled rectifier circuit and the AC voltage source, and the third physical parameters of a single diode in the single-phase bridge uncontrolled rectifier circuit.

[0126] The first determining module 620 is used to determine the fourth physical parameter of the load based on the first physical parameter, the second physical parameter, and the third physical parameter;

[0127] The second determining module 630 is used to determine the capacity of the energy storage capacitor based on the first physical parameter, the second physical parameter and the fourth physical parameter.

[0128] In one embodiment, the first determining module includes:

[0129] The first determining submodule is used to determine the load power loss based on the second physical parameter and the third physical parameter;

[0130] The second determining submodule is used to determine the fourth physical parameter of the load based on the first physical parameter, the second physical parameter, the third physical parameter and the load power loss.

[0131] In one embodiment, the second physical parameter includes the active power across the AC voltage source, and the first determining submodule includes:

[0132] The first determining unit is used to determine the resistive power loss before the single-phase bridge uncontrolled rectifier circuit based on the second physical parameters.

[0133] The second determining unit is used to determine the total diode power loss based on the second physical parameter and the third physical parameter;

[0134] The third determining unit is used to determine the load power loss based on the active power, the resistor power loss, and the total diode power loss.

[0135] In one embodiment, the second physical parameter includes the resistance value between the AC voltage source and the single-phase bridge uncontrolled rectifier circuit and the effective current value at the input terminal of the single-phase bridge uncontrolled rectifier circuit. The first determining unit includes:

[0136] The first determining subunit is used to determine the product of the square of the resistance value and the effective value of the current as the resistance power loss before the single-phase bridge uncontrolled rectifier circuit.

[0137] In one embodiment, the second physical parameter includes the effective value of the current at the input terminal of the single-phase bridge uncontrolled rectifier circuit, the third physical parameter includes the slope resistance of the diode, and the second determining unit includes:

[0138] The first determining subunit is used to determine the current value passing through the diode based on the effective value of the current;

[0139] The second determining subunit is used to determine the total diode power loss based on the current value passing through the diode and the slope resistor.

[0140] In one embodiment, the first physical parameter includes the effective voltage value of the voltage source, the second physical parameter includes the resistance and inductance values ​​between the AC voltage source and the single-phase bridge uncontrolled rectifier circuit, and the third physical parameter includes the slope resistance and forward voltage of the diode. The first determining module includes:

[0141] The first determining submodule is used to determine the equivalent resistance corresponding to the circuit at both ends of the load based on the resistance value and the slope resistance.

[0142] The second determining submodule is used to determine the equivalent impedance corresponding to the circuit at both ends of the load based on the equivalent resistance and the inductance value.

[0143] The third determining submodule is used to determine the port voltage based on the effective voltage value and the conduction voltage;

[0144] The fourth determining submodule is used to determine the fourth physical parameter of the load based on the equivalent impedance, the port voltage, and the second physical parameter.

[0145] In one embodiment, the first physical parameter further includes the period of the AC voltage source, and the second physical parameter further includes the effective value of the voltage at the input terminal of the single-phase bridge uncontrolled rectifier circuit. The second determining module includes:

[0146] The acquisition submodule is used to obtain the output voltage equation of the capacitor filter circuit.

[0147] The determination submodule is used to substitute the period, the effective value of the voltage, and the fourth physical parameter into the output voltage equation to determine the capacity of the energy storage capacitor.

[0148] Each module in the aforementioned capacitor capacity determination device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0149] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 7As shown, the computer device includes a processor, memory, and a network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores data such as physical parameters. The network interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a method for determining capacitor capacity.

[0150] Those skilled in the art will understand that Figure 7 The structures shown are merely block diagrams of some structures related to the embodiments of this disclosure and do not constitute a limitation on the computer devices on which the embodiments of this disclosure are applied. Specific computer devices may include more or fewer components than those shown in the figures, or combine certain components, or have different component arrangements.

[0151] In one embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above method embodiments.

[0152] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the steps in the above method embodiments.

[0153] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0154] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the embodiments of this disclosure are all information and data authorized by the user or fully authorized by all parties.

[0155] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this disclosure can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this disclosure may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this disclosure may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0156] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0157] The above-described embodiments are merely illustrative of several implementation methods of the present disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent for the embodiments of the present disclosure. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the embodiments of the present disclosure, and these all fall within the protection scope of the embodiments of the present disclosure. Therefore, the protection scope of the embodiments of the present disclosure should be determined by the appended claims.

Claims

1. A method for determining capacitor capacitance, characterized in that, The method is applied to a single-phase bridge uncontrolled rectifier circuit. The input terminal of the single-phase bridge uncontrolled rectifier circuit is electrically connected to an AC voltage source through a resistor and an inductor. The output terminal of the single-phase bridge uncontrolled rectifier circuit is electrically connected to an energy storage capacitor and a load. The method includes: acquiring a first physical parameter of the AC voltage source, a second physical parameter between the single-phase bridge uncontrolled rectifier circuit and the AC voltage source, and a third physical parameter of a single diode in the single-phase bridge uncontrolled rectifier circuit; wherein the first physical parameter includes the effective voltage value V of the AC voltage source. 20 and cycle T The second physical parameter includes the resistance value R between the AC voltage source and the single-phase bridge uncontrolled rectifier circuit. T and inductance value L T The effective value of the voltage V at the input terminal of the single-phase bridge uncontrolled rectifier circuit. 2RMS The effective value of the current I at the input terminal of the single-phase bridge uncontrolled rectifier circuit. 2RMS and the active power at both ends of the AC voltage source P 1 The third physical parameter includes the slope resistance of the diode. r T and the on-state voltage V F ; The fourth physical parameter of the load is determined based on the first physical parameter, the second physical parameter, and the third physical parameter, including determining the active power P consumed by the load. d Average voltage V across the load dAVG and the equivalent resistance R of the load load Specifically, this is done in the following way: based on the resistance value R T and the effective value of the current I 2RMS Determine the power loss of the resistor According to the effective value of the current I 2RMS and the slope resistor r T Determine the power loss of all diodes in the single-phase bridge uncontrolled rectifier circuit. ; Based on the active power P1 and the power loss ΔP of the resistor TR and the power loss ΔP of the diode VD Determine the active power consumed by the load. ; According to the resistance value R T The slope resistor r T and the inductance value L T Determine the equivalent resistance of the circuit as seen from the load end. Rsum =R T +2 r T and equivalent impedance , where X T For the network side resistance, X T =2π*f*L T ,frequency f =1 / T According to the effective voltage value V of the AC voltage source 20 and the forward voltage V of the diode F Determine the open-circuit port voltage on the load side. By solving the system of simultaneous equations Determine the average voltage V of the load. dAVG and the equivalent resistance R of the load load ; The capacity of the energy storage capacitor is determined based on the first physical parameter, the second physical parameter, and the fourth physical parameter. C Specifically, according to the period of the AC voltage source T The effective value of the voltage V at the input terminal of the single-phase bridge uncontrolled rectifier circuit. 2RMS The average voltage V across the load dAVG and the equivalent resistance R of the load load Utilizing the output voltage relationship of the capacitor filter circuit Determine the capacity of the energy storage capacitor. C .

2. A device for determining capacitance, characterized in that, The device is applied to a single-phase bridge uncontrolled rectifier circuit. The input terminal of the single-phase bridge uncontrolled rectifier circuit is electrically connected to an AC voltage source through a resistor and an inductor. The output terminal of the single-phase bridge uncontrolled rectifier circuit is electrically connected to an energy storage capacitor and a load. The device includes: an acquisition module for acquiring a first physical parameter of the AC voltage source, a second physical parameter between the single-phase bridge uncontrolled rectifier circuit and the AC voltage source, and a third physical parameter of a single diode in the single-phase bridge uncontrolled rectifier circuit; wherein... The first physical parameter includes the effective voltage value V of the AC voltage source. 20 and cycle T ; The second physical parameter includes the resistance value R between the AC voltage source and the single-phase bridge uncontrolled rectifier circuit. T and inductance value L T The effective value of the voltage V at the input terminal of the single-phase bridge uncontrolled rectifier circuit. 2RMS The effective value of the current I at the input terminal of the single-phase bridge uncontrolled rectifier circuit. 2RMS and the active power at both ends of the AC voltage source P 1 The third physical parameter includes the slope resistance of the diode. r T and the on-state voltage V F ; The first determining module is used to determine a fourth physical parameter of the load based on the first physical parameter, the second physical parameter, and the third physical parameter, including determining the active power P consumed by the load. d Average voltage V across the load dAVG and the equivalent resistance R of the load load The first determining module includes: The first calculation unit is used to calculate based on the resistance value R. T and the effective value of the current I 2RMS Determine the power loss of the resistor ; The second calculation unit is used to calculate based on the effective value of the current I. 2RMS and the slope resistance r T Determine the power loss of all diodes in the single-phase bridge uncontrolled rectifier circuit. ; The third calculation unit is used to calculate the active power P1 and the power loss ΔP of the resistor based on the active power P1. TR and the power loss ΔP of the diode VD Determine the active power consumed by the load. ; The fourth calculation unit is used to calculate the resistance value R. T The slope resistor r T and the inductance value L T Determine the equivalent resistance of the circuit as seen from the load end. Rsum =R T +2 r T and equivalent impedance , where X T For the network side resistance, X T =2π*f*L T ,frequency f =1 / T ; The fifth calculation unit is used to calculate the effective voltage value V of the AC voltage source. 20 and the forward voltage V of the diode F Determine the open-circuit port voltage on the load side. By solving the system of simultaneous equations: Determine the average voltage V of the load. dAVG and the equivalent resistance R of the load load ; Solver unit, used to solve simultaneous equations Determine the average voltage V of the load. dAVG and the equivalent resistance R of the load load ; The second determining module is used to determine the capacity of the energy storage capacitor based on the first physical parameter, the second physical parameter, and the fourth physical parameter. C Specifically, according to the period of the AC voltage source T The effective value of the voltage V at the input terminal of the single-phase bridge uncontrolled rectifier circuit. 2RMS The average voltage V across the load dAVG and the equivalent resistance R of the load load Utilizing the output voltage relationship of the capacitor filter circuit Determine the capacity of the energy storage capacitor. C .

3. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method of claim 1.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the method of claim 1.

5. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method of claim 1.

Images