CN109347106B - Method and system for evaluating loss of alternating current filter - Google Patents
Method and system for evaluating loss of alternating current filter Download PDFInfo
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Abstract
The invention relates to an evaluation method and a system for loss of an alternating current filter, which comprises the following steps: obtaining fundamental frequency current of a cross-over resistor of the alternating current filter according to preset basic parameters for the alternating current filter; obtaining the fundamental frequency loss of the cross-over resistor of the alternating current filter through the fundamental frequency current and the basic parameters used by the alternating current filter; obtaining an initial evaluation index of the loss of the alternating current filter through the base frequency loss according to the number of the converter stations and the number of the alternating current filters; and evaluating the loss of the alternating current filter according to the initial evaluation index of the loss of the alternating current filter. The method can effectively solve the problems of complex loss calculation, long time consumption and the like of the alternating current filter, quickens the iteration speed of the alternating current filter design, improves the efficiency of the alternating current filter design, and avoids the inaccuracy of harmonic loss calculation in the design stage.
Description
Technical Field
The invention relates to a filter loss evaluation method and a filter loss evaluation system, in particular to an alternating current filter loss evaluation method and an alternating current filter loss evaluation system applied to high-voltage direct current engineering.
Background
With the increasing popularization of the application of the high-voltage direct-current technology, the reduction of the design loss gradually becomes the focus of attention of designers. Reducing the design loss of the ac filter also becomes a key ring to reduce the design loss of the converter station. At present, the conventional method for calculating the loss of the alternating current filter is complex and tedious, voltage and current with different frequencies (up to 60 times) flowing through each element need to be calculated, meanwhile, a manufacturer needs to design related equipment first and provide loss related parameters, although the process is fine, the filter design is a process which needs to be continuously and repeatedly adjusted, if the loss calculation is carried out on each design result according to the method, the design period is greatly increased, and the practical significance is lacked.
In addition, the conventional loss calculation method includes harmonic loss and fundamental loss. For harmonic loss, due to various factors such as variable running modes of a direct current system, different valve manufacturing processes and the like, generated and related harmonic is an unstable factor and often fluctuates greatly in actual operation. The harmonics obtained by theoretical calculation are usually envelope values and cannot accurately represent the harmonic voltages and harmonic currents flowing through the components of the ac filter in real time. Because the fluctuation of the harmonic waves is difficult to accurately represent in the calculation, the calculation of the harmonic wave loss has great inaccuracy, and the loss value of the alternating current filter is far greater than the actually measured loss value. Therefore, the method has no strong practical significance in the design stage.
Meanwhile, the loss of the capacitor and the inductor is usually related to the manufacturing process, and according to the design flow of the general ac filter, the loss is not usually a critical factor causing excessive loss. The loss of the resistor depends mainly on the current flowing through the resistor, and in the case of improper design of the ac filter, the resistor loss often becomes a critical factor causing excessive loss. Therefore, it is important to examine the resistance loss in the initial design stage.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an ac filter loss evaluation method and system, which effectively solve the problems of complicated ac filter loss calculation and long time consumption, increase the iteration speed of ac filter design, improve the efficiency of ac filter design, and avoid the inaccuracy of harmonic loss calculation in the design stage.
In order to achieve the purpose, the invention adopts the following technical scheme: an evaluation method of loss of an alternating current filter comprises the following steps: 1) obtaining fundamental frequency current of a cross-over resistor of the alternating current filter according to preset basic parameters for the alternating current filter; 2) obtaining the fundamental frequency loss of the cross-over resistor of the alternating current filter through the fundamental frequency current and the basic parameters used by the alternating current filter; 3) obtaining an initial evaluation index of the loss of the alternating current filter through the base frequency loss according to the number of the converter stations and the number of the alternating current filters; 4) and evaluating the loss of the alternating current filter according to the initial evaluation index of the loss of the alternating current filter.
Further, in step 1), the basic parameters for the ac filter include an ac bus voltage to which the ac filter is connected, an ac system frequency, an ac filter capacitance value, an ac filter inductance value, and an ac filter resistance value.
Further, in the step 2), the basic parameter for the ac filter is a resistance value of the ac filter.
Further, the fundamental frequency loss of the cross-over resistor of the alternating current filter is equal to the fundamental frequency current2X the resistance R of the ac filter.
Further, in the step 3), the initial evaluation index of the loss of the ac filter is:
the initial index of the ac filter loss is the fundamental frequency loss of the ac filter bridge resistor × 3 (phase) × the number of ac filters × the number of converter stations.
Further, in the step 4), the evaluation method is as follows: if the initial evaluation index value is less than or equal to the preset AC filter loss requirement value, the AC filter loss is acceptable; if the initial evaluation index value is larger than the previously set ac filter loss requirement value, the ac filter loss is unacceptable, and the ac filter needs to be redesigned.
An evaluation system of loss of an alternating current filter comprises a fundamental frequency current acquisition module, a fundamental frequency loss acquisition module, a preliminary evaluation index module and an evaluation module; the base frequency current acquisition module obtains the base frequency current of the cross-over resistor of the alternating current filter according to the preset basic parameters for the alternating current filter; the fundamental frequency loss acquisition module acquires the fundamental frequency loss of the cross-over resistor of the alternating current filter through the fundamental frequency current and the basic parameters used by the alternating current filter; the initial evaluation index module obtains an initial evaluation index of the loss of the alternating current filter through the base frequency loss according to the number of the converter stations and the number of the alternating current filters; and the evaluation module evaluates the loss of the alternating current filter according to the initial evaluation index of the loss of the alternating current filter.
Further, in the fundamental frequency loss obtaining module, the fundamental frequency loss of the cross-over resistor of the ac filter is a fundamental frequency current2X the resistance R of the ac filter.
Further, in the initial evaluation indicator module, the initial evaluation indicator of the loss of the ac filter is the fundamental frequency loss × 3 (phase) × the number of ac filters × the number of converter stations of the across resistor of the ac filter.
Further, in the evaluation module, if the initial evaluation index value is less than or equal to a preset ac filter loss requirement value, the ac filter loss is acceptable; if the initial evaluation index value is larger than the previously set ac filter loss requirement value, the ac filter loss is unacceptable, and the ac filter needs to be redesigned.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. according to the invention, the number of the converter stations and the number of the filters are combined, and the fundamental frequency loss of the crossover resistor R of the AC filter group in the total station is used as an initial evaluation index of the total loss of the AC filter, so that the problems of complexity in AC filter loss calculation, time consumption and the like can be effectively solved, the iteration speed of the AC filter design is accelerated, the efficiency of the AC filter design is improved, and the inaccuracy of harmonic loss calculation in the design stage is avoided. 2. The initial evaluation index of the invention only needs to calculate the loss value related to the bridge resistor, thereby saving the harmonic calculation and the loss calculation of the capacitor and the inductance element and simplifying the design process. 3. The preliminary evaluation index provided by the invention can accelerate the process of judging whether the loss index causes unreasonable design of the alternating current filter in the design stage, shorten the design period and improve the design efficiency. 4. The initial evaluation index avoids the problems of inaccurate harmonic loss calculation and the like caused by uncertain factors such as an operation mode and the like, and the loss of the filter is initially evaluated by adopting the fundamental frequency value with higher accuracy, so that the efficiency of filter design is improved, and a more accurate index is provided for loss estimation. 5. The method can carry out rapid calculation through a plurality of basic parameters, carry out preliminary evaluation on the loss of the alternating current filter, preliminarily estimate whether the design of the alternating current filter can meet the loss requirement of a standard or not, reduce the increase of the design period of the filter (the feedback of the loss calculation and the filter design) caused by the loss calculation, and greatly shorten the design period.
Drawings
Fig. 1 is a schematic structural diagram of a double-tuned ac filter according to an embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
The invention provides an evaluation method of loss of an alternating current filter, which comprises the following steps:
1) obtaining fundamental frequency current of a cross-over resistor of the alternating current filter according to preset basic parameters for the alternating current filter;
the basic parameters for the ac filter include an ac bus voltage U to which the ac filter is connected, an ac system frequency f, an ac filter capacitance value C, an ac filter inductance value L, an ac filter resistance value R, and the like.
2) Obtaining the fundamental frequency loss of the cross-over resistor of the alternating current filter through the fundamental frequency current and the basic parameters used by the alternating current filter;
wherein, the basic parameter used by the AC filter is the resistance value R of the AC filter;
fundamental frequency loss of cross-over resistor of AC filter is fundamental frequency current2X the resistance R of the ac filter.
3) Obtaining an initial evaluation index of the loss of the alternating current filter through the base frequency loss according to the number of the converter stations and the number of the alternating current filters;
the initial evaluation index of the loss of the alternating current filter is equal to the fundamental frequency loss of a bridge resistor of the alternating current filter multiplied by 3 (phase) multiplied by the number of the alternating current filters multiplied by the number of the converter stations;
the preliminary evaluation index mainly characterizes the losses caused by the fundamental current flowing through the cross-over resistance. Therefore, the preliminary evaluation index is independent of harmonics, i.e., does not vary depending on uncertain factors such as an operation mode and a valve manufacturing process, and can be determined as long as the above parameters are determined.
4) Evaluating the loss of the alternating current filter according to the initial evaluation index of the loss of the alternating current filter;
if the initial evaluation index value is less than or equal to the preset AC filter loss requirement value, the AC filter loss is acceptable; if the initial evaluation index value is larger than the previously set ac filter loss requirement value, the ac filter loss is unacceptable, and the ac filter needs to be redesigned.
The invention also provides an evaluation system of the loss of the alternating current filter, which comprises a fundamental frequency current acquisition module, a fundamental frequency loss acquisition module, a preliminary evaluation index module and an evaluation module;
the base frequency current acquisition module obtains the base frequency current of the cross-over resistor of the alternating current filter according to the preset basic parameters for the alternating current filter;
the fundamental frequency loss acquisition module acquires the fundamental frequency loss of the cross-over resistor of the alternating current filter through the fundamental frequency current and the basic parameters used by the alternating current filter;
the initial evaluation index module obtains an initial evaluation index of the loss of the alternating current filter through the base frequency loss according to the number of the converter stations and the number of the alternating current filters;
and the evaluation module evaluates the loss of the alternating current filter according to the initial evaluation index of the loss of the alternating current filter.
In the above embodiment, in the fundamental frequency loss obtaining module, the fundamental frequency loss of the ac filter across the resistor is the fundamental frequency current2X the resistance R of the ac filter.
In the above embodiments, in the initial evaluation indicator module, the initial evaluation indicator of the ac filter loss is the fundamental frequency loss × 3 (phase) × ac filter number × converter station number of the ac filter bridge resistor.
In each of the above embodiments, in the evaluation module, if the initial evaluation index value is less than or equal to the preset ac filter loss requirement value, the ac filter loss is acceptable; if the initial evaluation index value is larger than the previously set ac filter loss requirement value, the ac filter loss is unacceptable, and the ac filter needs to be redesigned.
Example (b): the ac filter is a double-tuned filter, a triple-tuned filter, or other various filters, and in the present embodiment, the double-tuned filter is described as an example.
As shown in fig. 1, a topology diagram of a double-tuned ac filter is shown, which is connected to an ac bus of an ac system, and the relevant parameters are as follows:
alternating current system voltage U: 400kV, alternating current system frequency f: 50Hz, C1: 1.17uF, L1: 67.2mH, C2: 18.65uF, L2:56.5mH, R:800 ohm. The fundamental frequency current I of the ac filter across the resistor is:
wherein w is 2 pi f; "/" indicates the parallel connection of two elements;
the current through the bridge resistor R was found to be 7.3A.
Thus, the fundamental loss across the resistor R is obtained as:
P＝I2×R＝42.6kW；
the result is the loss of the crossover resistor R on one double tuned filter in this embodiment. And the initial evaluation index is obtained by combining the number of the filters and the number of the converter stations.
In a preferred example, there are two converter stations, each of which only contains 3 ac filters of this kind per phase, so the initial evaluation indicator P' of the ac filter loss in the dc system is:
P’＝42.6kW*3*3*2＝767kW。
in a preferred embodiment, the loss requirement of the dc system for the ac filter is 800kW, and the initial evaluation index P' is far more than 20% of the loss requirement, so the filter needs to be redesigned.
In summary, the invention preliminarily evaluates whether the design of the filter meets the requirement on loss by comparing the difference value between the initial evaluation index and the preset loss requirement of the alternating current filter, thereby providing a reference for the design of the alternating current filter. The index provided by the invention can simply and quickly judge whether the loss index causes the unreasonable design of the alternating current filter, saves the multi-party matching and the complex calculation, and improves the design efficiency.
A specific embodiment is given above, but the invention is not limited to the described embodiment. The basic idea of the present invention lies in the above solution, and it is obvious to those skilled in the art that it is not necessary to spend creative efforts to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (5)
1. A method for evaluating loss of an AC filter, comprising the steps of:
1) obtaining fundamental frequency current of a cross-over resistor of the alternating current filter according to preset basic parameters for the alternating current filter;
2) obtaining the fundamental frequency loss of the cross-over resistor of the alternating current filter through the fundamental frequency current and the basic parameters used by the alternating current filter;
3) obtaining an initial evaluation index of the loss of the alternating current filter through the base frequency loss according to the number of the converter stations and the number of the alternating current filters;
4) evaluating the loss of the alternating current filter according to the initial evaluation index of the loss of the alternating current filter;
in the step 2), the basic parameter for the alternating current filter is the resistance value of the alternating current filter;
the fundamental frequency loss of the cross-over resistor of the alternating current filter is equal to the fundamental frequency current2X the resistance value R of the alternating current filter;
in the step 3), the initial evaluation indexes of the loss of the alternating current filter are as follows:
the initial index of the ac filter loss is the fundamental frequency loss of the ac filter bridge resistor × 3 (phase) × the number of ac filters × the number of converter stations.
2. The evaluation method according to claim 1, wherein: in the step 1), the basic parameters for the ac filter include an ac bus voltage to which the ac filter is connected, an ac system frequency, an ac filter capacitance value, an ac filter inductance value, and an ac filter resistance value.
3. The evaluation method according to claim 1, wherein: in the step 4), the evaluation method comprises the following steps: if the initial evaluation index value is less than or equal to the preset AC filter loss requirement value, the AC filter loss is acceptable; if the initial evaluation index value is larger than the previously set ac filter loss requirement value, the ac filter loss is unacceptable, and the ac filter needs to be redesigned.
4. An ac filter loss evaluation system, characterized in that: the device comprises a fundamental frequency current acquisition module, a fundamental frequency loss acquisition module, a preliminary evaluation index module and an evaluation module;
the base frequency current acquisition module obtains the base frequency current of the cross-over resistor of the alternating current filter according to the preset basic parameters for the alternating current filter;
the fundamental frequency loss acquisition module acquires the fundamental frequency loss of the cross-over resistor of the alternating current filter through the fundamental frequency current and the basic parameters used by the alternating current filter;
the initial evaluation index module obtains an initial evaluation index of the loss of the alternating current filter through the base frequency loss according to the number of the converter stations and the number of the alternating current filters;
the evaluation module evaluates the loss of the alternating current filter according to the initial evaluation index of the loss of the alternating current filter;
in the fundamental frequency loss obtaining module, the fundamental frequency loss of the cross-over resistor of the alternating current filter is equal to the fundamental frequency current2X the resistance value R of the alternating current filter;
in the initial evaluation index module, the initial evaluation index of the loss of the alternating current filter is the fundamental frequency loss of a bridge resistor of the alternating current filter multiplied by 3 (phase) multiplied by the number of the alternating current filters multiplied by the number of the converter stations.
5. The evaluation system of claim 4, wherein: in the evaluation module, if the initial evaluation index value is less than or equal to a preset AC filter loss requirement value, the AC filter loss is acceptable; if the initial evaluation index value is larger than the previously set ac filter loss requirement value, the ac filter loss is unacceptable, and the ac filter needs to be redesigned.
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