CN106849150B - commutation failure prediction control system and method based on harmonic voltage detection - Google Patents
commutation failure prediction control system and method based on harmonic voltage detection Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
the invention relates to a commutation failure prediction control system and method based on harmonic voltage detection, 1) a harmonic voltage detection module detects low-order harmonic component times in commutation voltage to be detected on a commutation bus according to the low-order harmonic component times to obtain each low-order harmonic component of the commutation voltage; 2) the harmonic voltage calculation module respectively calculates the content ratio of each low-order harmonic component voltage relative to the fundamental voltage according to each low-order harmonic component in the obtained commutation voltage; 3) the comparison module compares the voltage content of each subharmonic with a starting threshold value according to the preset starting threshold value predicted by commutation failure, generates a starting signal according to a comparison result and sends the starting signal to the control module; 4) and the control module takes corresponding measures to carry out predictive control on the commutation failure of the commutation bus according to the sequence of the starting signals generated by the comparison module and the zero sequence voltage detection module in the existing control system. The invention can be widely applied to the technical field of power system control.
Description
Technical Field
the invention relates to the technical field of power system control, in particular to a commutation failure prediction control system and method based on harmonic voltage detection.
Background
Commutation failure is a common fault of a conventional voltage source converter (LCC-HVDC) inverter side converter. The phase change failure is mainly caused by disturbance of an alternating current system, which can cause reduction of direct current voltage at an inverter side, increase of direct current, increase of stress of a converter, and even possibly cause derating operation of the direct current system in severe cases. In order to reduce the probability of commutation failure, CFPREV (commutation failure predictive control) in a high-voltage dc control system usually prevents commutation failure caused by single-phase ground fault and three-phase short-circuit fault of an ac system by detecting zero-sequence components in the commutation voltage or performing α/β transformation on the commutation voltage. Aiming at the prediction and prevention control of commutation failure, scholars propose various improved prediction algorithms, including methods for improving the detection speed and accuracy near a zero crossing point, and adaptive fuzzy control or PI control is adopted to deal with the influence of different direct current control modes and operation conditions. However, in the above studies, no effective countermeasure against the phenomenon of commutation failure due to harmonic distortion has been studied.
In addition, with the mass production of high-voltage direct-current projects in China, direct-current multi-feed systems are formed or are being formed in areas such as east China and Shandong. Because the direct current drop points are dense, the magnetizing inrush current charged by a single alternating current transformer can cause multiple direct currents to have phase commutation failure, the attenuation period of the magnetizing inrush current is very long, and the risk of repeated phase commutation failure of the direct currents is increased. The adoption of the additional installation of a closing resistor or the adoption of special equipment to demagnetize the transformer undoubtedly increases the construction investment and the operating cost of the power grid.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a commutation failure prediction control system and method based on harmonic voltage detection, which is simple, effective, and can effectively prevent the problem of multiple repeated commutation failures caused by magnetizing inrush current during the charging process of a large ac transformer in cooperation with the existing commutation failure prevention control algorithm without adding additional transformer demagnetizing equipment.
In order to achieve the purpose, the invention adopts the following technical scheme: a commutation failure prediction control system based on harmonic voltage detection is characterized in that: the harmonic voltage detection module is used for detecting the harmonic voltage of the harmonic voltage; the harmonic voltage detection module is used for detecting low-order harmonics in the commutation phase voltage on the commutation bus in real time and sending each harmonic component obtained by detection to the harmonic voltage calculation module; the harmonic voltage calculation module is used for calculating the content rate of each low-order harmonic component voltage according to each obtained low-order harmonic component and sending the content rate to the comparison module; the comparison module is used for comparing the content rate of each harmonic voltage with a preset starting threshold value, generating a starting signal according to the comparison result and sending the starting signal to the control module; and the control module predicts and controls the commutation failure of the commutation bus according to the sequence of the starting signals sent by the comparison module and the zero sequence voltage detection module in the existing control system.
A commutation failure prediction control method based on harmonic voltage detection of the system is characterized by comprising the following steps: 1) the harmonic voltage detection module detects the low-order harmonic component number of the commutation voltage to be detected on the commutation bus in real time according to the determined low-order harmonic component number to obtain each low-order harmonic component of the commutation voltage, and sends the low-order harmonic component to the harmonic voltage calculation module; 2) the harmonic voltage calculation module respectively calculates the content ratio of each low-order harmonic component voltage relative to the fundamental voltage according to each low-order harmonic component in the obtained commutation voltage, and sends the content ratio to the comparison module; 3) the comparison module compares the voltage content of each subharmonic with a starting threshold value according to the preset starting threshold value predicted by commutation failure, generates a starting signal according to a comparison result and sends the starting signal to the control module; 4) and the control module takes corresponding measures to carry out predictive control on the commutation failure of the commutation bus according to the sequence of the starting signals generated by the comparison module and the zero sequence voltage detection module in the existing control system.
In the step 2), a calculation formula of the harmonic voltage content is as follows:
in the formula, DnIs the nth harmonic content, EnIs the nth harmonicA relative ground voltage root mean square value; ephIs the root mean square value of the voltage of the fundamental wave relative to the ground.
in the step 3), the method for comparing the voltage content of each harmonic with the starting threshold value comprises the following steps: if the content rate of any subharmonic exceeds a preset starting threshold value, generating a starting signal; and if the content rate of each harmonic voltage is lower than the starting threshold value, the operation is not performed.
In the step 4), the method for the control module to perform the predictive control of the commutation failure according to the sequence of the received starting signal of the comparison module and the starting signal of the zero sequence voltage detection module in the existing control system includes: if the comparison module outputs a starting signal prior to a starting signal of a zero sequence voltage detection module in the existing control system, the inversion side angle control is directly started, so that the arc-quenching angle is increased by 5 degrees; if the starting signal of the zero sequence voltage detection module in the existing control system is prior to the starting signal of the comparison module, a holding signal is generated to help to hold the increased extinction angle of the zero sequence voltage link until the harmonic voltage content rate is lower than the starting threshold value.
due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention researches the influence degree of the actual harmonic on the commutation phase voltage, realizes early triggering by detecting whether the voltage content of the lower harmonic component exceeds a preset starting threshold value or not, and reduces the risk of commutation failure caused by the harmonic. 2. The control module of the invention carries out the predictive control of the commutation failure according to the starting signals generated by the comparison module and the zero sequence voltage detection module of the existing control system, thereby not only realizing the early trigger before the existing control system, but also helping the existing control system to continuously output effective signals, and further improving the accuracy of the commutation failure prediction. 3. The method and the device have the advantages that two factors of commutation failure prediction and system background noise are considered simultaneously in the determination of the starting threshold value, so that commutation failure can be prevented in time, false starting caused by the existence of background harmonic waves is avoided, and the judgment is more accurate. The invention has the advantages of clear physical concept, simple and easy engineering implementation and convenient practical application, and effectively solves the problem of repeated phase change failure of nearby inversion stations caused by excitation inrush current generated in the charging process of a large transformer at extremely low cost. The invention can be widely applied to the technical field of power system control.
Drawings
FIG. 1 is a schematic diagram of a commutation failure prediction control system based on harmonic voltage detection according to the present invention;
FIG. 2(a) is a commutation bus voltage and a magnetizing inrush current in a typical no-load magnetizing inrush current waveform of a large AC transformer;
FIG. 2(b) is a converter bus voltage harmonic component in a typical no-charging magnetizing inrush current waveform of a large AC transformer;
Fig. 3 is a single line diagram of a system of a seiuzhou power plant (2 x 1000MW plant) with kaolin back-to-back dc and nearby in an embodiment of the invention;
FIG. 4 shows the simulation result of four failed phase commutations of the kaolin back-to-back converter station caused by the empty charging of a step-up transformer in the Suizhong power plant without the present invention; in the figure, three-phase alternating voltage, direct current, a converter transformer Y is connected with a winding valve side current, a converter transformer delta is connected with a winding valve side current, an inversion side arc extinguishing angle and a neutral bus direct current are sequentially arranged from top to bottom;
FIG. 5 shows the simulation result of the first commutation failure of the kaolin converter station caused by the empty charging of a step-up transformer in the Suizhong power plant after the present invention is adopted; in the figure, three-phase alternating voltage, direct current, a converter transformer Y connected with a winding valve side current, a converter transformer delta connected with a winding valve side current, an inverter side arc extinguishing angle and a neutral bus direct current are sequentially arranged from top to bottom.
Detailed Description
the invention is described in detail below with reference to the figures and examples.
As shown in fig. 1, in order to reduce the risk of repeated commutation failure of a nearby dc inverter station caused by magnetizing inrush current in the charging process of a large-scale transformer, the present invention provides a commutation failure prediction control system based on harmonic voltage detection, which includes a harmonic voltage detection module, a harmonic voltage calculation module, a comparison module, and a control module. The harmonic voltage detection module is used for detecting low-order harmonics in the phase-changing voltage on the current-changing bus in real time and sending each harmonic component obtained through detection to the harmonic voltage calculation module. And the harmonic voltage calculation module is used for calculating the content rate of each low-order harmonic component voltage according to each obtained low-order harmonic component and sending the content rate to the comparison module. The comparison module is used for comparing the content rate of each subharmonic voltage with a preset starting threshold value, generating a starting signal according to the comparison result and sending the starting signal to the control module. And the control module predicts and controls the commutation failure of the commutation bus according to the sequence of the starting signals sent by the comparison module and the zero sequence voltage detection module in the existing control system.
based on the commutation failure prediction control system based on the harmonic detection, the invention also provides a commutation failure prediction control method based on the harmonic detection, which comprises the following steps:
1) and the harmonic voltage detection module detects the low-order harmonic component number in the commutation voltage to be detected on the commutation bus in real time according to the determined low-order harmonic component number to obtain each low-order harmonic component of the commutation voltage, and sends the low-order harmonic component to the harmonic voltage calculation module.
As shown in fig. 2(a) and 2(b), the electromagnetic transient process of switching on the 500kV side of the extra-high voltage main transformer is shown, and the maximum excitation inrush current waveform of 6.3kA is used for excitation in the switching on process. As can be seen from the figure, the voltage of the commutation bus in the switching-on process contains a large number of harmonic components of 2, 3, 4 and 5 orders. The statistical data of the switching-on process and the harmonic component of the commutation bus 20ms after the switching-on process are analyzed, as shown in table 1 below, it is further verified that the voltage of the commutation bus in the switching-on process contains a large amount of harmonic components of 2, 3, 4, and 5, wherein the harmonic component of 2 is the largest and is 117.1kV (39.3%).
TABLE 1 ultra-high voltage main transformer 500kV side switching-on process current conversion busbar voltage harmonic content
from the above analysis, it can be seen that the harmonic frequencies at least need to be detected are 2, 3, 4 and 5 harmonic components according to the influence degree of the actual harmonic on the commutation phase voltage. The low-order harmonic component in the commutation voltage is detected in real time by adopting a fast Fourier algorithm or other digital filters, and the harmonic frequency mainly detected in the invention is 2-order, 3-order, 4-order and 5-order harmonic components so as to cover the characteristic harmonic frequency spectrum of the large-scale transformer no-load excitation surge current.
2) And the harmonic voltage calculation module calculates the content ratio of each low-order harmonic component voltage relative to the fundamental voltage according to each low-order harmonic component in the obtained commutation voltage and sends the content ratio to the comparison module.
Comparing each harmonic component in the commutation voltage with the fundamental voltage, respectively calculating the content of 2, 3, 4 and 5 harmonics, wherein the calculation formula of the harmonic voltage content is as follows:
In the formula, Dnis the nth harmonic content, EnThe root mean square value of the nth harmonic relative voltage; ephIs the root mean square value of the voltage of the fundamental wave relative to the ground.
3) The comparison module compares the content rate of each harmonic voltage with a starting threshold value according to the preset starting threshold value predicted by commutation failure, generates a starting signal according to a comparison result and sends the starting signal to the control module.
The determination of the actuation threshold is influenced by two main factors: firstly, when the content of any low-order harmonic exceeds 5%, the direct-current transmission inverter side converter has a high probability of phase commutation failure; the other is that the power system has background harmonic, if the starting threshold value is too small, the prediction module is possibly started frequently, and the voltage and power fluctuation of the direct current system is caused, and meanwhile, according to the national standard, the content rate of the larger 3 th order or 5 th order harmonic in the background harmonic should not exceed 1.5%. Therefore, the invention takes the phase commutation failure prediction starting threshold value based on the harmonic voltage as that the content rate of any subharmonic voltage exceeds 3 percent of the fundamental voltage, and the starting threshold value takes 3 percent to prevent the occurrence of the phase commutation failure in time, and meanwhile, the criterion can not be started by mistake due to the existence of background harmonic waves of an alternating current system.
Comparing the voltage content of each harmonic with a starting threshold value: if the content rate of any subharmonic exceeds a preset starting threshold value, generating a starting signal; and if the content rate of each harmonic voltage is lower than the starting threshold value, the operation is not performed.
4) And the control module takes corresponding measures to carry out predictive control on the commutation failure of the commutation bus according to the sequence of the starting signals generated by the comparison module and the zero sequence voltage detection module in the existing control system.
And the control module carries out the predictive control of the commutation failure according to the received starting signals of the comparison module and the sequence of the starting signals of the zero sequence voltage detection module in the existing control system. Specifically, the method comprises the following steps:
If the comparison module outputs a starting signal prior to a starting signal of a zero sequence voltage detection module in the existing control system, the inversion side angle control is directly started, so that the arc-quenching angle is increased by 5 degrees;
If the starting signal of the zero sequence voltage detection module in the existing control system is prior to the starting signal of the comparison module, a holding signal is generated to help to hold the increased arc-extinguishing angle of the zero sequence voltage link (the increased angle is determined by the zero sequence voltage link) until the harmonic voltage content is lower than the starting threshold value of 3%. The reason is that the actual zero sequence voltage criterion starting value is low and very sensitive, so that the zero sequence voltage criterion can be normally started during the action of the no-charging inrush current of the transformer, but effective output cannot be always kept due to the asymmetry of the no-charging inrush current. Therefore, the control module outputs the holding signal according to the starting signal of the comparison module, so that a long-time effective holding signal can be provided, and the zero-sequence voltage criterion can be always kept to be effectively output.
the present invention will be further described with reference to the following examples.
As shown in fig. 3, the schematic diagram of the kaolin back-to-back converter station (inversion side) and the system wiring of the seizhong power plant nearby, the seizhong power plant has 2 1000MW units in total, and the booster transformer capacity of each unit is 1111 MVA. The high-ridge back-to-back converter station in the figure adopts a conventional back-to-back direct current control system and is provided with a commutation failure prediction module CFPREV, so that zero sequence voltage detection and alpha/beta detection can be realized.
As shown in fig. 4 and 5, the times of failed phase commutation of the kaolin converter station caused by the empty charging of one step-up transformer in the seiuzhou power plant before and after the invention is adopted are respectively shown. FIG. 4 shows four failed commutation events for a kaolin converter station without the present invention; in fig. 5, only the first commutation failure occurs after the method of the present invention is used. The zero sequence voltage criterion is always kept to be effectively output due to the maintaining signal output by the control module, and the subsequent commutation failure is avoided.
the above embodiments are only for illustrating the present invention, and the structure, size, arrangement position and shape of each component can be changed, and on the basis of the technical scheme of the present invention, the improvement and equivalent transformation of the individual components according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (4)
1. A commutation failure prediction control system based on harmonic voltage detection is characterized in that: the harmonic voltage detection module is used for detecting the harmonic voltage of the harmonic voltage; the harmonic voltage detection module is used for detecting low-order harmonics in the commutation phase voltage on the commutation bus in real time and sending each harmonic component obtained by detection to the harmonic voltage calculation module; the low harmonic component is 2, 3, 4 and 5 harmonic components of the commutation voltage; the harmonic voltage calculation module is used for calculating the content rate of each low-order harmonic component voltage according to each obtained low-order harmonic component and sending the content rate to the comparison module; the comparison module is used for comparing the content rate of each harmonic voltage with a preset starting threshold value, generating a starting signal according to the comparison result and sending the starting signal to the control module; the control module predicts and controls the commutation failure of the commutation bus according to the sequence of the starting signals sent by the comparison module and the zero sequence voltage detection module in the existing control system: if the comparison module outputs a starting signal prior to a starting signal of a zero sequence voltage detection module in the existing control system, the inversion side angle control is directly started, so that the arc-quenching angle is increased by 5 degrees; if the starting signal of the zero sequence voltage detection module in the existing control system is prior to the starting signal of the comparison module, a holding signal is generated to help to hold the increased extinction angle of the zero sequence voltage link until the harmonic voltage content rate is lower than the starting threshold value.
2. A commutation failure predictive control method based on harmonic voltage detection in a system according to claim 1, comprising the steps of:
1) The harmonic voltage detection module detects the low-order harmonic component number of the commutation voltage to be detected on the commutation bus in real time according to the determined low-order harmonic component number to obtain each low-order harmonic component of the commutation voltage, and sends the low-order harmonic component to the harmonic voltage calculation module; wherein the low harmonic component is a harmonic component of 2, 3, 4, 5 times of the commutation voltage;
2) The harmonic voltage calculation module respectively calculates the content ratio of each low-order harmonic component voltage relative to the fundamental voltage according to each low-order harmonic component in the obtained commutation voltage, and sends the content ratio to the comparison module;
3) The comparison module compares the voltage content of each subharmonic with a starting threshold value according to the preset starting threshold value predicted by commutation failure, generates a starting signal according to a comparison result and sends the starting signal to the control module;
4) The control module takes corresponding measures to carry out predictive control on the commutation failure of the commutation bus according to the sequence of the starting signals generated by the comparison module and the zero sequence voltage detection module in the existing control system;
In the step 4), the method for the control module to perform the predictive control of the commutation failure according to the sequence of the received starting signal of the comparison module and the starting signal of the zero sequence voltage detection module in the existing control system includes:
If the comparison module outputs a starting signal prior to a starting signal of a zero sequence voltage detection module in the existing control system, the inversion side angle control is directly started, so that the arc-quenching angle is increased by 5 degrees;
if the starting signal of the zero sequence voltage detection module in the existing control system is prior to the starting signal of the comparison module, a holding signal is generated to help to hold the increased extinction angle of the zero sequence voltage link until the harmonic voltage content rate is lower than the starting threshold value.
3. The commutation failure prediction control method of harmonic voltage detection as claimed in claim 2, wherein: in the step 2), a calculation formula of the harmonic voltage content is as follows:
in the formula, DnIs the nth harmonic content, Enthe root mean square value of the nth harmonic relative voltage; ephIs the root mean square value of the voltage of the fundamental wave relative to the ground.
4. The commutation failure prediction control method of harmonic voltage detection as claimed in claim 2, wherein: in the step 3), the method for comparing the voltage content of each harmonic with the starting threshold value comprises the following steps:
if the voltage content rate of any subharmonic exceeds a preset starting threshold value, generating a starting signal;
And if the content rate of each harmonic voltage is lower than the starting threshold value, the operation is not performed.
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| CN107658895B (en) * | 2017-09-29 | 2020-12-04 | 国电南瑞科技股份有限公司 | Threshold value setting method for direct-current commutation failure prediction link |
| CN108631351A (en) * | 2018-04-28 | 2018-10-09 | 国网浙江省电力有限公司电力科学研究院 | A kind of the reason of DC transmission system commutation failure analysis method |
| CN108711877B (en) * | 2018-06-14 | 2020-10-20 | 南方电网科学研究院有限责任公司 | Method and device for inhibiting continuous commutation failure of parallel hybrid direct current system |
| CN109861264B (en) * | 2018-12-05 | 2022-04-22 | 国网河南省电力公司电力科学研究院 | Method and device for evaluating whether excitation surge current can cause HVDC commutation failure |
| CN109510230A (en) * | 2018-12-11 | 2019-03-22 | 国网山东省电力公司电力科学研究院 | A kind of continuous commutation failure suppressing method for HVDC transmission system |
| CN110427635B (en) * | 2019-05-29 | 2023-04-18 | 上海交通大学 | LCC-HVDC optimized electromagnetic transient simulation method |
| CN110518616B (en) * | 2019-07-03 | 2021-09-14 | 东南大学溧阳研究院 | Alternating current-direct current system commutation voltage prediction method based on first-order circuit response |
| CN112701676B (en) * | 2020-12-15 | 2023-07-07 | 深圳供电局有限公司 | Arc extinguishing angle prediction and commutation failure suppression method |
| CN113517712B (en) * | 2021-05-17 | 2022-10-25 | 国网甘肃省电力公司电力科学研究院 | Direct current system commutation method for improving success rate based on self-adaptive threshold of prediction link |
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