CN107634534A - Method and device for acquiring electrical parameters of main loop of flexible direct current transmission converter - Google Patents
Method and device for acquiring electrical parameters of main loop of flexible direct current transmission converter Download PDFInfo
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Abstract
The invention discloses a method and a device for acquiring electrical parameters of a main loop of a flexible direct current transmission converter, wherein the method comprises the following steps: acquiring structural parameters and target electrical parameters of an input alternating current bus in a main loop to obtain a first amplitude and a first phase of an alternating current output fundamental current of the flexible direct current transmission converter in an overmodulation state, and a direct current modulation ratio and an alternating current modulation ratio; and therefore, a second amplitude and a second phase of second harmonic circulating current in the flexible direct current transmission converter, and ripple voltage and ripple current of the bridge arm power module are obtained. The method and the device for acquiring the electrical parameters of the main loop of the flexible direct current transmission converter can acquire accurate electrical parameters of the main loop of the flexible direct current transmission converter so as to improve the reliability of a flexible direct current transmission system in an overmodulation state.
Description
Technical Field
The invention relates to the technical field of direct current transmission, in particular to a method and a device for acquiring electrical parameters of a main loop of a flexible direct current transmission converter.
Background
In the field of power supply, power transmission networks are the basis for achieving power transmission. With the development of science and technology, the technology of transmitting power is also advancing, and a new power transmission technology which is applied to a power transmission network is a flexible direct-current power transmission technology which is one of the power transmission technologies with higher attention at present. In a flexible direct current transmission power grid, a converter is an important component. Taking the flexible direct-current transmission converter as an example, in practical application, a flexible direct-current transmission power grid generally has a high technical requirement on reliability so as to ensure that a direct-current line fault is cleared and restarted quickly, and the technical requirement is met so that the characteristics of the flexible direct-current transmission converter meet certain technical conditions. To meet the certain technical condition, parameter design is mainly carried out on a main loop of the flexible direct current transmission converter. In order to accurately design parameters, it is necessary to obtain electrical parameters of the flexible dc transmission converter. However, to obtain these electrical parameters, it is necessary to establish a corresponding analysis model that conforms to the natural law.
The electrical parameters of the traditional flexible direct current transmission converter are obtained by an analysis model in a non-overmodulation working state, and when the converter works in the overmodulation working state, the electrical parameters of the flexible direct current transmission converter obtained by the analysis model in the non-overmodulation working state are not applicable, and correspondingly, the design of the main loop parameters of the flexible direct current transmission converter based on the obtained electrical parameters of the flexible direct current transmission converter is not accurate. That is to say, the traditional analysis model cannot accurately acquire the electrical parameters of the main loop, so that the reliable operation of the main loop of the flexible direct current transmission converter in the overmodulation state cannot be guaranteed.
Disclosure of Invention
Therefore, it is necessary to provide a method and a device for acquiring electrical parameters of a main loop of a flexible direct-current transmission converter, aiming at the technical problem that the parameters of the main loop of the flexible direct-current transmission converter cannot be accurately acquired in an overmodulation working state.
A method for acquiring electrical parameters of a main loop of a flexible direct current transmission converter comprises the following steps:
acquiring structural parameters of a main loop of a flexible direct-current transmission converter and target electrical parameters of an input alternating-current bus in the main loop; the structural parameters comprise the transformation ratio, apparent capacity, short-circuit impedance, inductance values of bridge arm reactors, the number of power modules of each bridge arm, rated operating voltage of the power modules, capacitance values of the power modules and power frequency angular frequency of a transformer connected with the flexible direct current transmission converter, and the target electrical parameters input into an alternating current bus in the main loop comprise a line voltage effective value, direct current voltage, direct current, active power and inductive reactive power;
according to the structural parameters and target electrical parameters of an input alternating current bus in a main loop, obtaining a first amplitude and a first phase of an alternating current output fundamental current of the flexible direct current transmission converter in an overmodulation state, and a direct current modulation ratio and an alternating current modulation ratio;
obtaining a second amplitude and a second phase of the second harmonic circulating current in the flexible direct current transmission converter according to the first amplitude and the first phase, and the direct current modulation ratio and the alternating current modulation ratio;
and obtaining ripple voltage and ripple current of the bridge arm power module of the flexible direct current transmission converter according to the first amplitude and the first phase, and the second amplitude and the second phase.
A flexible direct current transmission converter main loop electrical parameter acquisition device comprises:
the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring structural parameters of a main loop of the flexible direct-current transmission converter and target electrical parameters of an input alternating-current bus in the main loop; the structural parameters comprise the transformation ratio, apparent capacity, short-circuit impedance, inductance values of bridge arm reactors, the number of power modules of each bridge arm, rated operating voltage of the power modules, capacitance values of the power modules and power frequency angular frequency of a transformer connected with the flexible direct current transmission converter, and the target electrical parameters input into an alternating current bus in the main loop comprise a line voltage effective value, direct current voltage, direct current, active power and inductive reactive power;
the first processing module is used for obtaining a first amplitude and a first phase of an alternating current output fundamental wave current of the flexible direct current transmission converter in an overmodulation state, a direct current modulation ratio and an alternating current modulation ratio according to the structural parameters and target electrical parameters of an input alternating current bus in a main loop;
the second processing module is used for obtaining a second amplitude and a second phase of the second harmonic circulating current in the flexible direct current transmission converter according to the first amplitude and the first phase, and the direct current modulation ratio and the alternating current modulation ratio;
and the third processing module is used for obtaining ripple voltage and ripple current of the bridge arm power module of the flexible direct current transmission converter according to the first amplitude and the first phase and the second amplitude and the second phase.
A computer arrangement comprising a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein the processor when executing the program implements the steps of the method for obtaining electrical parameters of a primary loop of a flexible dc power transmission converter.
A computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, is characterized by the steps of the method for obtaining electrical parameters of a primary loop of a flexible dc power converter.
According to the method for acquiring the electrical parameters of the main loop of the flexible direct current transmission converter, the second amplitude and the second phase angle of the internal secondary harmonic circulation of the flexible direct current transmission converter, the ripple voltage and the ripple current are acquired according to the first amplitude and the first phase of the alternating current output fundamental voltage of the flexible direct current transmission converter in the over-modulation working state, the direct current modulation ratio and the alternating current modulation ratio, the problem that the electrical quantity of the main loop of the flexible direct current transmission converter obtained by a traditional analysis model cannot be used for accurately designing the parameters of the main loop of the flexible direct current transmission converter in the over-modulation state is solved, and the effect of accurately acquiring the electrical parameters of the main loop of the flexible direct current transmission converter in the over-modulation state is achieved, so that the reliable operation of the main loop of the flexible direct current transmission converter in the over.
Drawings
FIG. 1 is a flow chart of an electrical parameter acquisition method according to one embodiment of the present invention;
FIG. 2 is an overall flow chart of an electrical parameter acquisition method according to an embodiment of the present invention;
fig. 3 is a block diagram of an electrical parameter acquisition apparatus according to an embodiment of the present invention.
Detailed Description
The following describes in detail a specific embodiment of the method for acquiring an electrical parameter of a main loop of a flexible dc power transmission converter according to the present invention with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
With the development of science and technology, technologies for transmitting electric power are also developed, and technologies for high-voltage transmission and extra-high-voltage transmission are realized and applied to new transmission technologies in a transmission network, such as flexible direct current transmission (HVDC). In a flexible direct current transmission power grid, a converter is an important power grid structure component. Taking a flexible direct-current transmission converter, particularly a voltage source converter, as an example, a flexible direct-current transmission power grid generally has higher reliability technical requirements in practical application, so as to ensure that a direct-current transmission line system has the capability of quickly clearing faults and quickly restarting, and thus, the technical reliability of stable and efficient transmission is improved.
Achieving the aforementioned technical requirements requires that the characteristics of the main circuit of the flexible dc transmission converter meet specific technical conditions. These specific technical conditions are different in different external environments and input situations of the dc link system and are limited by the actual operating conditions of the flexible dc transmission converters in the dc transmission line system. To meet the specific technical conditions, the main task is to design parameters of the main loop of the flexible direct current transmission converter (or to select the type of the converter equipment). In order to accurately design parameters, the electrical parameters of the flexible direct current transmission converter in the corresponding working state need to be accurately obtained. However, to obtain these electrical parameters, an analysis model corresponding to the actual working environment of the flexible dc power transmission converter and conforming to the natural law needs to be established.
The electrical parameters of the traditional flexible direct current transmission converter are obtained by an analysis model established in a non-overmodulation working state, wherein the non-overmodulation working state refers to all working states except the overmodulation working state; when the converter works in the overmodulation working state, the electric parameters of the flexible direct current transmission converter obtained by using the analysis model in the non-overmodulation working state are not applicable any more, and the inaccurate analysis result can be obtained when the electric parameters are directly used for the characteristic analysis of the main loop of the flexible direct current transmission converter, and the parameter design based on the inaccurate analysis result is also inaccurate; further, the device model selection or the monitoring of the operation state of the main loop according to the misaligned parameters will cause errors or accidents.
Based on the above problem, the following embodiments of the present invention provide a method for obtaining electrical parameters of a main loop of a flexible dc power transmission converter, which is suitable for automatic calculation and obtaining of electrical parameters of a main loop of a flexible dc power transmission converter in an overmodulation operating state, so as to accurately design parameters of a main loop of a flexible dc power transmission converter in an overmodulation operating state (or accurately select converter equipment), so as to avoid equipment failure when the main loop operates in an overmodulation state.
Referring to fig. 1, taking a voltage source converter as an example, a main loop of a flexible dc power converter includes an ac bus, and a method for obtaining an electrical parameter of the main loop of the flexible dc power converter in an embodiment of the present invention includes the steps of:
s120, acquiring structural parameters of a main loop of the flexible direct current transmission converter and target electrical parameters of an input alternating current bus in the main loop; the structural parameters comprise the transformation ratio, the apparent capacity, the short-circuit impedance, the inductance value of the bridge arm reactors, the number of each bridge arm power module, the rated operating voltage of the power module, the capacitance value of the power module capacitor and the power frequency angular frequency of the flexible direct-current transmission converter connecting transformer. The target electrical parameters of the input alternating current bus in the main loop comprise a line voltage effective value, direct current voltage, direct current, active power and inductive reactive power.
The flexible direct-current transmission converter can be a voltage source converter, and is specifically divided into a rectifier and an inverter, the two types of converters and the inverter are identical in equipment and different in control, and any one of the converters and the inverter can be suitable for the parameter acquisition method provided by the embodiment of the invention. The flexible dc transmission referred to in this specification may be a two-terminal or multi-stage flexible dc transmission, or may be a modular level flexible dc transmission.
It can be understood that the target electrical parameter input to the ac bus in the main circuit may be an engineering electrical quantity preset based on an actual power supply scenario during dc power transmission. Correspondingly, the structural parameters may refer to parameters of the converter in the flexible direct current transmission, which are determined by the structure of the converter, such as the transformation ratio, the apparent capacity, the short-circuit impedance, the inductance value of the reactor of the bridge arm, the number of power modules of each bridge arm, the rated operating voltage of the power modules, the capacitance value of the capacitor of the power modules, and the power frequency angular frequency of the converter.
Specifically, the computing device may obtain the target electrical parameter and the structural parameter of the input ac bus in the main loop by direct scanning or by direct reading through electrical connection with the flexible dc power transmission network system, the converter, data connection, or the like, so as to prepare for subsequent parameter calculation and result output.
And S140, according to the structural parameters and the target electrical parameters of the input alternating current bus in the main loop, obtaining a first amplitude and a first phase of the alternating current output fundamental wave current of the flexible direct current transmission converter in the overmodulation state, and a direct current modulation ratio and an alternating current modulation ratio.
Wherein, overmodulation refers to a state that some peak values of the modulation signal exceed the maximum allowable value of the system or device under consideration, and the peak values may be the maximum amplitude of the voltage and the maximum amplitude of the current, or may be the minimum amplitude of the voltage and the minimum amplitude of the current; the system can be a flexible direct current transmission line system, and the equipment can be a flexible direct current transmission converter or all components inside the flexible direct current transmission converter.
Specifically, after the calculation device obtains the target electrical parameters and structural parameters of the ac bus bar input into each main circuit required by parameter calculation, a first amplitude and a first phase of the ac output fundamental current of the flexible dc power transmission converter in the overmodulation operating state may be calculated first. And simultaneously calculating a direct current modulation ratio and an alternating current modulation ratio. In this way, the computing device is ready to perform the next stage of the computing process.
And S160, obtaining a second amplitude and a second phase of the second harmonic circulating current in the flexible direct current transmission converter according to the first amplitude and the first phase of the alternating current output fundamental current of the flexible direct current transmission converter in the overmodulation working state and the calculated direct current modulation ratio and alternating current modulation ratio.
It can be understood that in this step, the computing device automatically calculates two main parameters of the flexible direct current transmission converter, namely the second amplitude and the second phase of the second harmonic circulating current inside the flexible direct current transmission converter, through a mathematical analysis model stored inside the computing device, by using the first amplitude, the first phase, the direct current modulation ratio and the alternating current modulation ratio obtained through the previous calculation. It should be noted that the technical terms first amplitude, first phase, second amplitude and second phase are used herein, mainly to distinguish different amplitude and phase quantities, rather than to represent the corresponding amplitude and phase names in practical applications.
And S180, obtaining ripple voltage and ripple current of the bridge arm power module of the flexible direct current transmission converter according to the first amplitude, the first phase, the second amplitude and the second phase.
The bridge arm of the flexible direct current transmission converter can comprise an upper bridge arm and a lower bridge arm, each of the upper bridge arm and the lower bridge arm can comprise a power module, the number of the power modules can be not less than one, and different types of converters are selected, and the number of the bridge arm power modules is different correspondingly. Accordingly, the ripple voltage may include a ripple voltage of the upper arm power module and a ripple voltage of the lower arm power module corresponding to the upper arm and the lower arm. The ripple current may include a ripple current of the upper arm power module and a ripple current of the lower arm power module. The ripple voltage of the upper bridge arm power module and the ripple current of the lower bridge arm power module of the flexible direct current transmission converter can be accurately obtained through the step.
It can be understood that according to the second amplitude and the second phase of the second harmonic circulating current in the flexible direct current transmission converter obtained in the foregoing steps, the ripple voltage and the ripple current of the upper bridge arm power module, and the ripple voltage and the ripple current of the lower bridge arm power module, since the corresponding quantities are obtained by calculation in the over-modulation operating state, the electrical parameters of the main loop of the flexible direct current transmission converter in the over-modulation operating state are obtained.
Based on the electrical parameters, the main loop of the flexible direct-current transmission converter in the overmodulation application scene can be accurately designed with the electrical parameters, so that the applicable converter or other equipment can be selected in the flexible direct-current transmission project; and parameter checking can be carried out on the main loop of the flexible direct current transmission converter based on the obtained electrical parameters so that the direct current transmission line system has the capability of rapidly clearing faults and rapidly restarting, and the stable and efficient technical reliability of the main loop in the direct current transmission system is guaranteed.
For the sake of clarity and convenience of description, the first amplitude, the first phase, the second amplitude and the second phase appearing in the foregoing description will be directly described using the concept defined by specific terms in the following description, for example, the first amplitude is equivalent to the amplitude of the ac output fundamental current of the hvdc converter, the first phase is equivalent to the phase of the ac output fundamental current of the hvdc converter, the second amplitude is equivalent to the amplitude of the second harmonic circulating current inside the hvdc converter, and the second phase is equivalent to the phase of the second harmonic circulating current inside the hvdc converter.
In one embodiment, for step S140, the amplitude of the ac output fundamental current of the hvdc converter can be calculated by the following formula:
wherein, I1Representing the amplitude of the AC output fundamental current of the flexible DC power transmission converter, P representing the active power injected into the AC bus by the flexible DC, Q representing the inductive reactive power injected into the AC bus by the flexible DC, and UsAnd represents the effective value of the line voltage of the input alternating current bus. The phase of the alternating current output fundamental current of the flexible direct current transmission converter can be calculated by the following formula:
wherein,representing the phase of the fundamental current of the AC output of the flexible DC transmission converter, P representing the active power injected into the AC bus by the flexible DC, QcAnd the inductive reactive power output by the flexible direct current transmission converter is shown. It should be noted that the formula given in this embodiment is only an optional mathematical analysis model, not a unique form, and a skilled person may perform corresponding deformation and parameter replacement on the analysis model, for example, adding a correction coefficient, according to the actual application scenario. The amplitude and the phase of the corresponding AC output fundamental wave current of the flexible DC power transmission converter in the overmodulation working state can be accurately obtained. Of course, the parameter letters used are merely exemplary and are not uniquely assigned reference numbers.
When the phase of the AC output fundamental wave current of the flexible DC transmission converter is calculated by using the above model, when the active power P injected into the AC bus by the flexible DC is more than 0 or less than 0, the calculating equipment automatically selects the corresponding phase for calculating the AC output fundamental wave current of the flexible DC transmission converterTo ensure accurate calculation of the phase of the obtained AC output fundamental current of the flexible DC transmission converterThe amplitude and the phase of the alternating current output fundamental current of the flexible direct current transmission converter obtained through the mathematical analysis model can be applied to the calculation of the amplitude and the phase of the internal second harmonic circulating current of the converter in the next operation stage and the calculation of other electrical parameters in the acquisition method, so that the accuracy of the final calculation result is ensured.
In an alternative embodiment, the dc modulation ratio in step S140 can be calculated by the following formula:
wherein m isdcIndicating the DC modulation ratio, U, of a flexible DC transmission converterdcIndicating the DC voltage input to the AC bus, N indicating the number of power modules per arm of the flexible DC transmission converter, USMRepresenting the rated operating voltage of the power module. It should be noted that the formula given in this embodiment is only an optional mathematical analysis model, and is not a unique form, and depending on the practical application scenario, a skilled person may use other calculation formulas to calculate the dc modulation ratio, or perform corresponding deformation and parameter replacement on the analysis model, for example, add a correction coefficient. The method is only required to accurately obtain the corresponding direct current modulation ratio of the flexible direct current transmission converter in the overmodulation working state. Of course, the parameter letters used are merely exemplary and are not uniquely assigned reference numbers.
The direct current modulation ratio of the flexible direct current transmission converter obtained through the mathematical analysis model can be applied to amplitude and phase calculation of secondary harmonic circulating current in the flexible direct current transmission converter and calculation of other electrical parameters in the obtaining method, and accuracy of an analysis result is further ensured.
In yet another alternative embodiment, the ac modulation ratio for step S140 can be calculated by the following formula:
wherein m isacExpressing the AC modulation ratio of the flexible DC transmission converter, E expressing the amplitude of the internal output voltage of the flexible DC transmission converter, N expressing the flexible DC transmissionNumber of power modules per bridge arm of the electric current converter, USMRepresenting the rated operating voltage of the power module. It should be noted that the formula given in this embodiment is only an optional calculation formula, and is not a unique form, and depending on the practical application scenario, a skilled person may use another calculation formula to calculate the ac modulation ratio, or perform corresponding deformation and parameter replacement on the calculation formula, such as adding a correction coefficient. Only the corresponding AC modulation ratio of the flexible DC power transmission converter in the overmodulation working state can be accurately obtained. Of course, the parameter letters used are merely exemplary and are not uniquely assigned reference numbers.
For step S160, in a further embodiment, the amplitude of the second harmonic circulating current inside the flexible dc transmission converter can be calculated by the following formula:
wherein, I2Representing the amplitude, L, of the second harmonic circulating current within a flexible DC transmission convertersRepresenting inductance value, m, of bridge arm reactordcDenotes the DC modulation ratio, macIndicating AC modulation, N indicating the number of power modules per bridge arm of the converter, IdcRepresenting the DC current input to the AC bus, C representing the capacitance of the power module, IdcIndicating the direct current, omega, input to the AC bus0Representing the power frequency angular frequency of the power module. Of course, the parameter letters used are merely exemplary and are not uniquely assigned reference numbers.
The phase of the second harmonic circulating current in the flexible direct current transmission converter can be calculated by the following formula:
wherein,the phase of the second harmonic circulating current in the flexible direct current transmission converter is shown, and further, the intermediate quantity A, B is calculated according to the following formula:
wherein, I1Which is indicative of a first magnitude of the amplitude,denotes the first phase, mdcDenotes the DC modulation ratio, macRepresenting AC modulation, N representing the number of power modules per bridge arm of the flexible DC transmission converter, IdcIndicating the direct current, L, of the input AC bussRepresenting the inductance value of the bridge arm reactor, C representing the capacitance value of the bridge arm power module, omega0Representing the power frequency angular frequency of the power module.
It is to be understood that the setting of intermediate quantity A, B is an expression that represents a generalization and simplification of the model to facilitate understanding of the use. When the intermediate quantity B is more than 0 or less than 0, two phases for calculating the second harmonic circulating current in the flexible direct current transmission converter are respectively correspondedThe calculation equipment automatically selects the formula corresponding to the conditions to perform calculation when performing operation so as to ensure that the phase of the secondary harmonic circulating current in the flexible direct current transmission converter obtained by accurate calculation is ensuredAiming at the phase of the internal second harmonic circulating current of the flexible direct current transmission converterThe intermediate quantities A, B may be written in the phases respectivelyWith the addition of corresponding deformations to achieve the same result and the same or better computational effect, wherein the intermediate quantity B corresponds to a different phase at values greater than 0 or less than 0And (4) a formula.
Under the over-modulation working state, the amplitude I of the alternating current output fundamental current of the flexible direct current transmission converter is respectively calculated and obtained through the analysis model1Phase of AC output fundamental current of flexible DC transmission converterDC modulation ratio m of flexible DC converterdcThe alternating current modulation ratio m of the flexible direct current transmission converteracThrough the amplitude I of the internal second harmonic circulating current of the corresponding flexible DC power transmission converter2And phaseAnalyzing the model to obtain the amplitude I of the internal second harmonic circulating current of the flexible direct current transmission converter in the overmodulation working state2And phaseIt should be clearly noted that the analysis model or the mathematical analysis model described in this specification represents the corresponding calculation formula according to which the computing device described above performs the operation.
In another embodiment, for step S180, the ripple voltage of the leg power module of the flexible dc transmission converter can be calculated by the following formula:
wherein,Δup_SMrepresenting the ripple voltage, Delauu, of the upper arm power module of a flexible DC transmission convertern_SMAnd the ripple voltage of the lower bridge arm power module of the flexible direct current transmission converter is shown. The power module represents each power module on the upper bridge arm or the lower bridge arm, and in some scenarios, each power module may be combined into one power module to perform corresponding ripple voltage expression as long as the ripple voltage expression can be more conveniently understood and calculated. Showing the convenient description and the optimized calculation effect, the intermediate quantity uc1、uc2And uc3Calculated by the following formula:
where Re () represents the value representing each intermediate quantity by taking the real part of the complex number of the calculation equation, I1Is representative of the first magnitude of the first amplitude,representing said first phase, I2Is representative of the second magnitude of the first amplitude,representing said second phase, mdcRepresents the DC modulation ratio, macRepresenting said alternating current modulation, IdcRepresenting the DC current input to the AC bus, C representing the capacitance of the bridge arm power module, omega0The power frequency angular frequency of the power module is represented, j represents an imaginary unit, and t represents time.
Accordingly, the skilled person can perform appropriate modifications and variable substitutions on the above calculation formula according to actual calculation requirements, for example, adding correction coefficients, so as to better achieve improvement of calculation efficiency and accurate calculation of the above electrical parameters in the overmodulation operating state of the flexible direct current transmission converter.
Under the over-modulation working state, the flexible direct-current transmission obtained by respectively calculating through the analysis modelAmplitude I of AC output fundamental current of converter1Phase of AC output fundamental current of flexible DC transmission converterDC modulation ratio m of flexible DC converterdAc modulation ratio macAmplitude I of internal second harmonic circulating current of flexible direct current transmission converter2And phaseRipple voltage delta u of upper bridge arm power module of corresponding flexible direct current transmission converterp_SMRipple voltage delta u of lower bridge arm power module of flexible direct current transmission convertern_SMThe analysis model can obtain ripple voltage delta u of the upper bridge arm power module of the flexible direct current transmission converter in the overmodulation working statep_SMAnd ripple voltage delta u of lower bridge arm power module of flexible direct current transmission convertern_SM。
In another embodiment, for step S180, the ripple current of the leg power module of the flexible dc transmission converter can be calculated by the following formula:
wherein, Δ ip_SMRepresenting the ripple current, Δ i, of the upper arm power module of a flexible DC transmission convertern_SMRepresents the ripple current of the lower bridge arm power module of the flexible DC transmission converter, and the intermediate quantity ic1、ic2And ic3Can be calculated according to the following formula:
wherein, I1Is representative of the first magnitude of the first amplitude,representing said first phase, I2Is representative of the second magnitude of the first amplitude,representing said second phase, mdcRepresents the DC modulation ratio, macRepresenting said alternating current modulation, IdcIndicating the direct current, omega, input to the AC bus0The power frequency angular frequency of the power module is represented, Re () represents the real part of a complex number, j represents an imaginary unit, and t represents time.
Accordingly, the skilled person can also perform appropriate modifications and variable substitutions on the above calculation formula according to actual calculation needs, such as adding correction coefficients, so as to improve the calculation efficiency and achieve accurate calculation under overmodulation.
Under the over-modulation working state, the amplitude I of the AC output fundamental current of the converter obtained by the analysis model is respectively calculated1The phase of AC output fundamental current of the converterDC modulation ratio m of flexible DC converterdcThe alternating current modulation ratio m of the flexible direct current transmission converteracAmplitude I of internal second harmonic circulating current of flexible direct current transmission converter2And phaseRipple current delta i passing through corresponding upper bridge arm power module of flexible direct current transmission converterp_SMRipple current delta i of lower bridge arm power module of flexible direct current transmission convertern_SMThe analysis model can obtain ripple current delta i of the upper bridge arm power module of the flexible direct current transmission converter in the overmodulation working statep_SMAnd ripple current delta i of lower bridge arm power module of flexible direct current transmission convertern_SM。
Optionally, the parameter in the parameter obtaining method according to the embodiment of the present invention may refer to an amplitude and a phase of a secondary circulating current inside the flexible dc transmission converter, or at least one parameter of a ripple voltage and a ripple current of a bridge arm power module of the flexible dc transmission converter, for example, refer to an amplitude and a phase of a secondary circulating current inside the flexible dc transmission converter, or a ripple voltage and a ripple current of a bridge arm power module of the flexible dc transmission converter; or based on the amplitude and the phase of the secondary circulating current in the flexible direct current transmission converter, after the ripple voltage and the ripple current of the bridge arm power module of the flexible direct current transmission converter are analyzed, other parameters which can be used for the converter in actual flexible direct current transmission are automatically generated by the computing equipment, and the operation reliability of the main loop of the flexible direct current transmission converter applying the other parameters can be greatly improved in a high-voltage or extra-high-voltage input power grid.
In an overall embodiment, referring to fig. 2, the method for obtaining electrical parameters of a main loop of a flexible dc power transmission converter according to the present invention may further include the steps of:
s110, obtaining the amplitude of the internal output voltage of the flexible direct current transmission converter according to the following formula:
wherein E represents the amplitude of the internal output voltage of the flexible direct current transmission converter, X represents the equivalent connection impedance of the alternating current side of the flexible direct current transmission converter, Q represents the inductive reactive power injected into the alternating current bus by the flexible direct current, P represents the active power injected into the alternating current bus by the flexible direct current, and U represents the equivalent connection impedance of the flexible direct current transmission converterSExpressing effective value of line voltage of input AC bus, k expressing transformation ratio of AC bus connecting transformer, Uk% represents the short-circuit impedance of the AC busbar connection transformer, STRepresenting ac bus-coupling transformersApparent capacity, ω0Representing the power frequency angular frequency, L, of the power modulesRepresenting the bridge arm reactor inductance value.
Through the calculation model, the transition parameters required for calculating the electric parameters of the main loop of the flexible direct current transmission converter, namely the amplitude E of the internal output voltage of the flexible direct current transmission converter and the equivalent connection impedance X of the alternating current side of the flexible direct current transmission converter, are obtained based on the target electric parameters of the input alternating current bus in the main loop of the flexible direct current transmission converter and the structural parameters of the main loop of the flexible direct current transmission converter, for example, the amplitude E of the internal output voltage of the flexible direct current transmission converter obtained according to the model can facilitate the alternating current modulation ratio macAnd (4) calculating.
S115, obtaining the inductive reactive power output by the converter according to the following formula:
wherein Q iscExpressing the inductive reactive power output from the interior of the flexible DC power transmission converter, Q expressing the inductive reactive power injected into the AC bus by the flexible DC, X expressing the equivalent connection impedance at the AC side of the flexible DC power transmission converter, P expressing the active power injected into the AC bus by the flexible DC, USAnd k represents the effective value of the line voltage input into the alternating current bus, and k represents the transformation ratio of the alternating current bus connecting transformer. Obtaining the phase angle for calculating the AC output fundamental current of the converter through the calculation modelRequired basic parameter, namely, internal output inductive reactive power Q of flexible direct current transmission convertercAnd according to the model, obtaining the internal output inductive reactive power Q of the flexible direct current transmission convertercThe calculation of another transition parameter in the parameter obtaining method of the embodiment of the invention can be facilitated, for example, the calculation of the phase of the AC output fundamental current of the flexible DC transmission converter。
In an embodiment, all the above calculations are automatically performed on a computing device, for example, all the above analysis models are encoded to make a parameter design system and placed on the computing device in advance, the computing device may obtain the target electrical parameters and structural parameters of the input ac bus in the main loop by direct scanning or by direct reading with a flexible dc power transmission network system, an inverter electrical connection, a data connection, and the like, and then may automatically perform the parameter calculation according to the input known quantity, thereby achieving the automatic acquisition of the parameters of the flexible dc power transmission main loop. The computing device can be a large monitoring device, a special or ordinary computer, even a tablet computer, and can also be some electrical measuring device specially designed for the power transmission system. When the method is applied, for example, when the flexible direct current transmission converter is monitored to work in an overmodulation state, the computing equipment is automatically triggered to be started, and parameter checking is carried out on a main loop of the flexible direct current transmission converter so as to ensure that the main loop can reliably run in real time.
Referring to fig. 3, in an embodiment, the apparatus for acquiring electrical parameters of a main loop of a flexible dc power transmission converter of the present invention includes a first acquiring module 10, a first processing module 11, a second processing module 12, and a third processing module 13.
The first obtaining module 10 is configured to obtain a target electrical parameter and a structural parameter of an input ac bus in a main loop of the flexible dc power transmission converter.
The first processing module 11 is configured to obtain a first amplitude and a first phase of an ac output fundamental current of the flexible dc power transmission converter in an overmodulation state, and a dc modulation ratio and an ac modulation ratio according to a target electrical parameter and a structural parameter of an input ac bus in the main loop.
And a second processing module 12, configured to obtain a second amplitude and a second phase of a second harmonic circulating current inside the flexible dc power transmission converter according to the first amplitude and the first phase, and the dc modulation ratio and the ac modulation ratio.
And a third processing module 13, configured to obtain ripple voltage and ripple current of the flexible direct current transmission converter bridge arm power module according to the first amplitude and the first phase, and the second amplitude and the second phase.
In one embodiment, a computer device is provided that includes a memory having stored thereon a computer program executable on a processor, and a processor. When the processor executes the computer program on the memory, the following steps are executed: acquiring target electrical parameters and structural parameters of an input alternating current bus in a main loop of the flexible direct current transmission converter; according to target electrical parameters and structural parameters of an input alternating current bus in a main loop, obtaining a first amplitude and a first phase of alternating current output fundamental current of the flexible direct current transmission converter in an overmodulation state, and a direct current modulation ratio and an alternating current modulation ratio; obtaining a second amplitude and a second phase of the second harmonic circulating current in the flexible direct current transmission converter according to the first amplitude and the first phase, and the direct current modulation ratio and the alternating current modulation ratio; and obtaining ripple voltage and ripple current of the bridge arm power module of the flexible direct current transmission converter according to the first amplitude, the first phase, the second amplitude and the second phase.
In another embodiment, the processor, when executing the computer program on the memory, may also perform the processing steps in the foregoing embodiments.
In one embodiment, a computer readable storage medium is provided, the computer readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform the steps of: acquiring target electrical parameters and structural parameters of an input alternating current bus in a main loop of the flexible direct current transmission converter; according to target electrical parameters and structural parameters of an input alternating current bus in a main loop, obtaining a first amplitude and a first phase of alternating current output fundamental current of the flexible direct current transmission converter in an overmodulation state, and a direct current modulation ratio and an alternating current modulation ratio; obtaining a second amplitude and a second phase of the second harmonic circulating current in the flexible direct current transmission converter according to the first amplitude and the first phase, and the direct current modulation ratio and the alternating current modulation ratio; and obtaining ripple voltage and ripple current of the bridge arm power module of the flexible direct current transmission converter according to the first amplitude, the first phase, the second amplitude and the second phase.
In another embodiment, the computer program as described in the preceding paragraph, when executed by a processor, causes the processor to perform the processing steps of the preceding embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware associated with computer program instructions, and the programs may be stored in a computer readable storage medium and sold or used as a stand-alone product. The program, when executed, may perform all or a portion of the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for acquiring electrical parameters of a main loop of a flexible direct current transmission converter is characterized by comprising the following steps:
acquiring structural parameters of a main loop of a flexible direct-current transmission converter and target electrical parameters of an input alternating-current bus in the main loop; the structural parameters comprise the transformation ratio, apparent capacity, short-circuit impedance, inductance values of bridge arm reactors, the number of power modules of each bridge arm, rated operating voltage of the power modules, capacitance values of the power modules and power frequency angular frequency of a transformer connected with the flexible direct current transmission converter, and the target electrical parameters input into an alternating current bus in the main loop comprise a line voltage effective value, direct current voltage, direct current, active power and inductive reactive power;
according to the structural parameters and target electrical parameters of an input alternating current bus in a main loop, obtaining a first amplitude and a first phase of an alternating current output fundamental current of the flexible direct current transmission converter in an overmodulation state, and a direct current modulation ratio and an alternating current modulation ratio;
obtaining a second amplitude and a second phase of the second harmonic circulating current in the flexible direct current transmission converter according to the first amplitude and the first phase, and the direct current modulation ratio and the alternating current modulation ratio;
and obtaining ripple voltage and ripple current of the bridge arm power module of the flexible direct current transmission converter according to the first amplitude and the first phase, and the second amplitude and the second phase.
2. The method for obtaining the main loop electrical parameters of the flexible direct current transmission converter according to claim 1, wherein the method for obtaining the second amplitude and the second phase of the second harmonic circulating current inside the flexible direct current transmission converter comprises the following steps:
calculating the second amplitude value according to the following formula:
calculating the second phase according to the following equation:
intermediate quantity A, B is calculated according to the following equation:
wherein, I2Is representative of the second magnitude of the first amplitude,representing said second phase, I1Is representative of the first magnitude of the first amplitude,representing said first phase, mdcRepresents the DC modulation ratio, macRepresenting the AC modulation, N representing the number of power modules per bridge arm of the converter, IdcIndicating the direct current, L, of the input AC bussRepresenting the inductance value of the bridge arm reactor, C representing the capacitance value of the bridge arm power module, omega0Representing the power frequency angular frequency of the power module.
3. The method for acquiring the electrical parameters of the main loop of the flexible direct current transmission converter according to claim 1, wherein the method for acquiring the ripple voltage of the bridge arm power module of the flexible direct current transmission converter comprises the following steps:
calculating the ripple voltage of the bridge arm power module of the flexible direct current transmission converter according to the following formula:
<mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>&Delta;u</mi> <mrow> <mi>p</mi> <mo>_</mo> <mi>S</mi> <mi>M</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>u</mi> <mrow> <mi>c</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>u</mi> <mrow> <mi>c</mi> <mn>2</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>u</mi> <mrow> <mi>c</mi> <mn>3</mn> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>&Delta;u</mi> <mrow> <mi>n</mi> <mo>_</mo> <mi>S</mi> <mi>M</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <msub> <mi>u</mi> <mrow> <mi>c</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>u</mi> <mrow> <mi>c</mi> <mn>2</mn> </mrow> </msub> <mo>-</mo> <msub> <mi>u</mi> <mrow> <mi>c</mi> <mn>3</mn> </mrow> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced>
intermediate amount uc1、uc2And uc3Calculated by the following formula:
wherein, Δ up_SMRepresents the ripple voltage, delta u, of the upper bridge arm power module of the flexible DC convertern_SMRepresents the ripple voltage of the lower arm power module of the flexible DC converter, I1Is representative of the first magnitude of the first amplitude,representing said first phase, I2Is representative of the second magnitude of the first amplitude,representing said second phase, mdcRepresents the DC modulation ratio, macRepresenting said alternating current modulation, IdcAC bus with input indicationC represents the capacitance value of the capacitor of the bridge arm power module, omega0The power frequency angular frequency of the power module is represented, Re () represents the real part of a complex number, j represents an imaginary unit, and t represents time.
4. The method for acquiring the electrical parameters of the main loop of the flexible direct current transmission converter according to claim 1, wherein the method for acquiring the ripple current of the bridge arm power module of the flexible direct current transmission converter comprises the following steps:
calculating the ripple current of the bridge arm power module of the flexible direct current transmission converter according to the following formula:
<mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>&Delta;i</mi> <mrow> <mi>p</mi> <mo>_</mo> <mi>S</mi> <mi>M</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>i</mi> <mrow> <mi>c</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>i</mi> <mrow> <mi>c</mi> <mn>2</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>i</mi> <mrow> <mi>c</mi> <mn>3</mn> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>&Delta;i</mi> <mrow> <mi>n</mi> <mo>_</mo> <mi>S</mi> <mi>M</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <msub> <mi>i</mi> <mrow> <mi>c</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>i</mi> <mrow> <mi>c</mi> <mn>2</mn> </mrow> </msub> <mo>-</mo> <msub> <mi>i</mi> <mrow> <mi>c</mi> <mn>3</mn> </mrow> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced>
intermediate quantity ic1、ic2And ic3Calculated according to the following formula:
wherein, Δ ip_SMIndicating the ripple current, Δ i, of the upper arm power module of a flexible DC convertern_SMRepresents the ripple current of the lower bridge arm power module of the flexible DC converter, I1Is representative of the first magnitude of the first amplitude,representing said first phase, I2Is representative of the second magnitude of the first amplitude,representing said second phase, mdcRepresents the DC modulation ratio, macRepresenting said alternating current modulation, IdcIndicating the direct current, omega, input to the AC bus0The power frequency angular frequency of the power module is represented, Re () represents the real part of a complex number, j represents an imaginary unit, and t represents time.
5. The method according to claim 1, wherein the first amplitude value is obtained according to the following formula:
<mrow> <msub> <mi>I</mi> <mn>1</mn> </msub> <mo>=</mo> <msqrt> <mfrac> <mn>2</mn> <mn>3</mn> </mfrac> </msqrt> <mfrac> <msqrt> <mrow> <msup> <mi>P</mi> <mn>2</mn> </msup> <mo>+</mo> <msup> <mi>Q</mi> <mn>2</mn> </msup> </mrow> </msqrt> <msub> <mi>U</mi> <mi>s</mi> </msub> </mfrac> </mrow>
wherein, I1Representing the amplitude of the fundamental current of the AC output of the converter, P representing the active power injected into the AC bus by the flexible DC, Q representing the inductive reactive power injected into the AC bus by the flexible DC, UsA line voltage effective value representing an input alternating current bus;
the first phase is obtained according to the following formula:
wherein,representing the phase of the fundamental current of the ac output of the converter, P representing the active power injected into the ac bus by the flexible dc, QcAnd the inductive reactive power output by the flexible direct current transmission converter is shown.
6. The method according to claim 5, wherein the internal output inductive reactive power of the HVDC converter is obtained according to the following formula:
<mrow> <msub> <mi>Q</mi> <mi>c</mi> </msub> <mo>=</mo> <mi>Q</mi> <mo>+</mo> <mfrac> <mrow> <msup> <mi>P</mi> <mn>2</mn> </msup> <mo>+</mo> <msup> <mi>Q</mi> <mn>2</mn> </msup> </mrow> <msup> <mrow> <mo>(</mo> <msub> <mi>U</mi> <mi>s</mi> </msub> <mo>/</mo> <mi>k</mi> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mfrac> <mo>&CenterDot;</mo> <mi>X</mi> </mrow>
wherein Q iscExpressing the inductive reactive power output from the interior of the flexible DC power transmission converter, Q expressing the inductive reactive power injected into the AC bus by the flexible DC, X expressing the equivalent connection impedance at the AC side of the flexible DC power transmission converter, P expressing the active power injected into the AC bus by the flexible DC, USAnd k represents the effective value of the line voltage input into the alternating current bus, and k represents the transformation ratio of the alternating current bus connecting transformer.
7. The method according to claim 1, wherein the electrical parameter of the main loop of the flexible direct current transmission converter comprises at least one of the second amplitude, the second phase, a ripple voltage and a ripple current.
8. The utility model provides a flexible direct current transmission transverter major loop electrical parameter acquisition device which characterized in that includes:
the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring structural parameters of a main loop of the flexible direct-current transmission converter and target electrical parameters of an input alternating-current bus in the main loop; the structural parameters comprise the transformation ratio, apparent capacity, short-circuit impedance, inductance values of bridge arm reactors, the number of power modules of each bridge arm, rated operating voltage of the power modules, capacitance values of the power modules and power frequency angular frequency of a transformer connected with the flexible direct current transmission converter, and the target electrical parameters input into an alternating current bus in the main loop comprise a line voltage effective value, direct current voltage, direct current, active power and inductive reactive power;
the first processing module is used for obtaining a first amplitude and a first phase of an alternating current output fundamental wave current of the flexible direct current transmission converter in an overmodulation state, a direct current modulation ratio and an alternating current modulation ratio according to the structural parameters and target electrical parameters of an input alternating current bus in a main loop;
the second processing module is used for obtaining a second amplitude and a second phase of the second harmonic circulating current in the flexible direct current transmission converter according to the first amplitude and the first phase, and the direct current modulation ratio and the alternating current modulation ratio;
and the third processing module is used for obtaining ripple voltage and ripple current of the bridge arm power module of the flexible direct current transmission converter according to the first amplitude and the first phase and the second amplitude and the second phase.
9. A computer arrangement comprising a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein the processor when executing the program implements the steps of the method of acquiring electrical parameters of a primary loop of a flexible dc power converter according to any one of claims 1 to 7.
10. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the method for obtaining electrical parameters of a primary loop of a flexible dc power transmission converter according to any of claims 1 to 7.
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Effective date of registration: 20210601 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China South Power Grid International Co.,Ltd. Address before: 510663 3 building, 3, 4, 5 and J1 building, 11 building, No. 11, Ke Xiang Road, Luogang District Science City, Guangzhou, Guangdong. Patentee before: China South Power Grid International Co.,Ltd. Patentee before: POWER GRID TECHNOLOGY RESEARCH CENTER. CHINA SOUTHERN POWER GRID |