CN113595127A - Current deviation control optimization method for inhibiting direct current subsequent commutation failure - Google Patents
Current deviation control optimization method for inhibiting direct current subsequent commutation failure Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a current deviation control optimization method for inhibiting direct current subsequent commutation failure, which specifically comprises the following steps: acquiring a constant turn-off angle of an inverter side, an advance trigger angle instruction output by a constant current controller, a minimum value of a single power frequency period of a turn-off angle and a current deviation control output value in real time when a direct current system operates; judging the relation of the advanced trigger angle instruction size to obtain a control input enabling signal S1, and widening to obtain an additional turn-off angle increment input enabling signal S2; the four real-time data above are used to calculate the additional turn-off angle delta gamma required to facilitate the system's return to the constant turn-off angle control modet(ii) a When the signal S2 is high, Δ γ is input based on the original current deviation control outputtAnd optimizing the current deviation control output. The invention can effectively shorten the time that the inversion side is in constant current control after the first commutation failure, so that the inversion side enters a constant turn-off angle control mode in advance, and the turn-off angle is ensured to be continuously controlledAnd the failure of direct current subsequent commutation can be effectively avoided.
Description
Technical Field
The invention belongs to the technical field of current deviation control optimization of a high-voltage direct-current transmission system, and particularly relates to a current deviation control optimization method for inhibiting direct-current subsequent commutation failure.
Background
With the continuous increase of the electric power demand in China, a line communated converter high voltage direct current (LCC-HVDC) based on the power grid commutation is widely applied to long-distance and large-capacity power transmission and power system networking due to the advantages of large transmission capacity, long transmission distance, fast control response and the like. However, when an alternating current fault occurs on the inversion side of the LCC-HVDC, the risk of phase commutation failure exists, wherein the first phase commutation failure generally occurs within 20ms after the fault, a control system is often unreachable, difficult to prevent and limited in influence; and the subsequent commutation failure occurs when the control system is fully involved, which is the result of the comprehensive influence of the electrical quantity and the control quantity after the failure and can bring multiple impacts to the whole power grid.
The existing subsequent commutation failure suppression strategies of the high-voltage direct-current transmission system can be divided into direct-current limiting and early triggering. The main technical means for limiting the direct current include optimization of a low voltage dependent current instruction (VDCOL), direct adjustment of a direct current instruction, and the like, and the main technical means for triggering in advance include optimization of a constant interruption angle (CEA) control link, direct adjustment of a reference value of the constant interruption angle, and the like.
The Current Error Controller (CEC) is one of the control links of the dc system, and is used to implement smooth switching between constant turn-off angle control and Constant Current (CC) control on the inverter side, and to ensure that the system has a stable operating point when the leakage reactance of the transformer on the rectifier side is lower than that on the inverter side. The prior literature indicates that the occurrence of the subsequent direct-current commutation failure is related to the fact that the direct-current control system enters a constant-current control mode on the inversion side after the initial commutation failure, and the selection of the control mode on the inversion side is essentially to compare the magnitude of the advanced trigger angle instruction output by the two control modes. Theoretically, the selection and switching of the control mode of the inverter side can be realized by adjusting the current deviation control output, but there is a few literature in the prior art to optimize the current deviation control and improve the control behavior of the inverter side of the system so as to reduce the risk of subsequent commutation failure.
Disclosure of Invention
In order to improve the control mode switching process of the inverter side after the system fault, the subsequent commutation failure resistance capability of the system under various fault conditions can be effectively improved. The invention provides a current deviation control optimization method for inhibiting direct current subsequent commutation failure.
The invention discloses a current deviation control optimization method for inhibiting direct current subsequent commutation failure, which comprises the following specific steps of:
A. data acquisition
In the running process of the direct current transmission system, the following characteristic quantities of the inversion side of the direct current transmission system are collected in real time: advanced trigger angle command value beta output by constant turn-off angle controllerceaAdvanced firing angle command value beta output by constant current controllerccMinimum value gamma of off-angle in single power frequency periodmAnd the off-angle margin value delta gamma output by the current deviation controllercec(ii) a All data acquisition frequencies are the same as f1。
B. Additional turn-off angle increase control input enable signal acquisition
B1, controlling the constant current of the inversion side to output value betaccInput to the input end of a double-input comparator A, and control the output value beta of the inverter side constant turn-off angleceaInputting the signal to the input end of a double-input comparator B; when A is>B, the comparator outputs a control enable signal S1 to be high level, A<At time B, the enable signal S1 is low.
B2, delaying the control input enable signal S1 for a preset duration delta t of the widening circuit to obtain an additional turn-off angle increment input enable signal S2.
C. Calculation of additional turn-off angle increments
C1, additional calculated delta gamma for the cut-off angle required to make provisions to facilitate the system's return to constant cut-off angle control modecThe formula is as follows:
wherein k isp,GControlling PI link proportionality coefficient, gamma, for inverting side fixed turn-off anglenFor the off-angle reference value, krel1Is a response stability factor.
C2, stepData beta collected in Acea、βcc、γm、ΔγcecThe calculated value of the extra turn-off angle increment is obtained by real-time substitution into the formula in C1c(ii) a At the same time, an additional turn-off angle increment input value Deltay is defined which is required to be input to promote the system to return to the constant turn-off angle control mode againt。
D. Additional input of angular increment of turn-off
When the enable signal S2 is at high level, an additional turn-off angle increment input value delta gamma is input on the basis of the original current deviation control output of the inversion sidetControlling the turn-off angle of the high-voltage direct-current power transmission system; when the enable signal S2 is at low level, the original current deviation control output of the inversion side is not changed, and delta gamma is not inputt。
Sampling frequency f in data acquisition in step A1Is 1 kHz.
Δ t in the preset duration of the stretching circuit in step B2 is 0.5 s.
Proportional coefficient k of inversion side constant turn-off angle control PI link in step C1p,G0.7506, the reference value of the turn-off angle gammanAt 0.2618rad, response stability factor krel1Value range of 1<krel1<1.3。
Compared with the prior art, the invention has the beneficial technical effects that:
according to the method, the control response behavior of the direct-current transmission control system after the alternating-current fault occurs is improved, the original current deviation control link is optimized, corresponding extra turn-off angle increment is input on the basis of original current deviation control output according to real-time collected related data of the direct-current transmission system, so that the inversion side system can be quickly switched back from the constant current control mode after the initial commutation failure is recovered, the constant turn-off angle control mode is kept, the turn-off angle can be continuously controlled after the initial commutation failure occurs, and further sufficient commutation margin is provided for the subsequent commutation process, so that the subsequent commutation failure is avoided. Meanwhile, the method calculates the extra turn-off angle increment in real time based on real-time data, so that the advance trigger angle instruction value of the constant turn-off angle control can be adjusted in real time according to the advance trigger angle instruction value of the constant current control, the reduction of the system recovery speed caused by the overhigh advance trigger angle instruction value after the system enters a constant turn-off angle control mode can be avoided, and the recovery characteristic of the direct current transmission system after the fault can be improved to a certain extent. In general, the method can effectively solve the problem of subsequent commutation failure caused by improper control and adjustment after the direct current system fails, effectively improves the subsequent commutation failure resistance capability of the direct current system under the condition of multiple faults, improves the recovery characteristic of the direct current transmission system after the direct current transmission system fails, and is beneficial to safe and stable operation of the system.
Drawings
Fig. 1 is a flowchart of a current deviation control optimization method for suppressing subsequent dc commutation failure according to the present invention.
Detailed Description
The invention is further explained in detail below with reference to the drawings and simulation experiments.
The invention discloses a current deviation control optimization method for inhibiting direct current subsequent commutation failure, which is shown in figure 1 and comprises the following specific steps:
A. data acquisition
In the running process of the direct current transmission system, the following characteristic quantities of the inversion side of the direct current transmission system are collected in real time: advanced trigger angle command value beta output by constant turn-off angle controllerceaAdvanced firing angle command value beta output by constant current controllerccMinimum value gamma of off-angle in single power frequency periodmAnd the off-angle margin value delta gamma output by the current deviation controllercec(ii) a All data acquisition frequencies are the same as f1。
B. Additional turn-off angle increase control input enable signal acquisition
B1, controlling the constant current of the inversion side to output value betaccInput to the input end of a double-input comparator A, and control the output value beta of the inverter side constant turn-off angleceaInputting the signal to the input end of a double-input comparator B; when A is>B, the comparator outputs a control enable signal S1 to be high level, A<At time B, the enable signal S1 is low.
B2, delaying the control input enable signal S1 for a preset duration delta t of the widening circuit to obtain an additional turn-off angle increment input enable signal S2.
C. Calculation of additional turn-off angle increments
C1, additional calculated delta gamma for the cut-off angle required to make provisions to facilitate the system's return to constant cut-off angle control modecThe formula is as follows:
wherein k isp,GControlling PI link proportionality coefficient, gamma, for inverting side fixed turn-off anglenFor the off-angle reference value, krel1Is a response stability factor.
C2, collecting the data beta in the step Acea、βcc、γm、ΔγcecThe calculated value of the extra turn-off angle increment is obtained by real-time substitution into the formula in C1c(ii) a At the same time, an additional turn-off angle increment input value Deltay is defined which is required to be input to promote the system to return to the constant turn-off angle control mode againt。
D. Additional input of angular increment of turn-off
When the enable signal S2 is at high level, an additional turn-off angle increment input value delta gamma is input on the basis of the original current deviation control output of the inversion sidetControlling the turn-off angle of the high-voltage direct-current power transmission system; when the enable signal S2 is at low level, the original current deviation control output of the inversion side is not changed, and delta gamma is not inputt。
Sampling frequency f in data acquisition in step A1Is 1 kHz.
Δ t in the preset duration of the stretching circuit in step B2 is 0.5 s.
Proportional coefficient k of inversion side constant turn-off angle control PI link in step C1p,G0.7506, the reference value of the turn-off angle gammanAt 0.2618rad, response stability factor krel1Value range of 1<krel1<1.3。
The principle of the invention is as follows:
the inversion side of the direct current transmission system is provided with two controllers of CC and CEA, and at any moment, the system adopts the larger advanced trigger angle instruction value output by the two controllers. The CEA controller is essentially a PI link, and the input quantity is a turn-off angle deviation value and is a turn-off angle reference value gammanPlus current deviation control output value delta gammacecSubtracting the measured value gamma of the turn-off anglemAnd obtaining the product. When the deviation value is positive, the CEA controller outputs a value betaceaThe trend is increasing; when the deviation value is negative, betaceaWith a decreasing trend. After the first commutation failure is recovered, the angle measurement value gamma is cut offmWill result in betaceaRapid decrease of (a) resulting in betacea<βccThe system will enter the CC control mode, resulting in uncontrolled turn-off angle, with consequent risk of commutation failure.
The invention uses double-input comparator and widening circuit to realize control starting logic, when detecting that the system enters CC control mode (beta)cea<βcc) The comparator outputs a control input enable signal S1 to be changed into high level, and simultaneously carries out delay broadening to the high level to obtain an extra turn-off angle increment input enable signal S2, when the enable signal S2 is high level, the control of the invention is started, and the extra turn-off angle increment delta gamma capable of promoting the system to be switched from the CC control mode to the CEA control mode is inputtThe input time of the CC controller is greatly shortened, and then the occurrence of subsequent commutation failure is avoided.
Simulation experiment
In order to verify the suppression effect of the invention on subsequent commutation failure, a CIGRE direct current transmission standard test model of PSCAD/EMTDC is taken as a simulation model, a single/three-phase grounding fault is set at an alternating current bus of an inversion side of the simulation model, and different fault severity (measured by fault grounding inductance, the range is 0.2H-1.0H, the step length is 0.1H, the smaller the inductance is, the more serious the fault is) and different fault closing angles (measured by different fault moments, the range is 1.000 s-1.020 s, the step length is 0.002s) are considered, and the fault lasts for 0.2 s. Under the fault conditions, the system resists the subsequent commutation failure after comparing whether the proposed strategy is adopted or not.
The single-phase earth fault simulation results are shown in tables 1 and 2:
TABLE 1 number of subsequent commutation failures without this strategy under single-phase earth fault
TABLE 2 number of subsequent commutation failures with this strategy under single-phase earth fault
Simulation results show that under the conditions of the above 99 inverter side alternating current bus single-phase ground faults, 2 subsequent phase commutation failures occur in 5 types, 1 subsequent phase commutation failure occurs in 70 types, and no subsequent phase commutation failure occurs in 24 types. After the strategy provided by the invention is adopted, no subsequent commutation failure occurs, and the subsequent commutation failure inhibition capability is proved to be good under the condition of single-phase earth fault.
The three-phase ground fault simulation results are shown in tables 3 and 4:
TABLE 3 number of subsequent commutation failures without this strategy under three-phase earth fault
TABLE 4 number of subsequent commutation failures with this strategy under three-phase earth fault
Simulation results show that under the simulated 99 inverter side alternating current bus three-phase grounding fault conditions, 46 types of subsequent phase commutation failures can occur for 1 time, and 53 types of subsequent phase commutation failures can occur. After the strategy provided by the invention is adopted, no subsequent commutation failure occurs, and the subsequent commutation failure inhibition capability is proved to be good under the condition of three-phase grounding failure.
Claims (4)
1. A current deviation control optimization method for inhibiting direct current subsequent commutation failure is characterized by comprising the following specific steps:
A. data acquisition
In the running process of the direct current transmission system, the following characteristic quantities of the inversion side of the direct current transmission system are collected in real time: advanced trigger angle command value beta output by constant turn-off angle controllerceaAdvanced firing angle command value beta output by constant current controllerccMinimum value gamma of off-angle in single power frequency periodmAnd the off-angle margin value delta gamma output by the current deviation controllercec(ii) a All data acquisition frequencies are the same as f1；
B. Additional turn-off angle increase control input enable signal acquisition
B1, controlling the constant current of the inversion side to output value betaccInput to the input end of a double-input comparator A, and control the output value beta of the inverter side constant turn-off angleceaInputting the signal to the input end of a double-input comparator B; when A is>B, the comparator outputs a control enable signal S1 to be high level, A<At time B, the enable signal S1 is low;
b2, delaying the control input enable signal S1 for a preset time delta t of the broadening circuit to obtain an additional turn-off angle increment input enable signal S2;
C. calculation of additional turn-off angle increments
C1, additional calculated delta gamma for the cut-off angle required to make provisions to facilitate the system's return to constant cut-off angle control modecThe formula is as follows:
wherein k isp,GControlling PI link proportionality coefficient, gamma, for inverting side fixed turn-off anglenFor the off-angle reference value, krel1Is a response stability factor;
c2, collecting the data beta in the step Acea、βcc、γm、ΔγcecThe calculated value of the extra turn-off angle increment is obtained by real-time substitution into the formula in C1c(ii) a At the same time, an additional turn-off angle increment input value Deltay is defined which is required to be input to promote the system to return to the constant turn-off angle control mode againt：
D. Additional input of angular increment of turn-off
When the enable signal S2 is at high level, an additional turn-off angle increment input value delta gamma is input on the basis of the original current deviation control output of the inversion sidetControlling the turn-off angle of the high-voltage direct-current power transmission system; when the enable signal S2 is at low level, the original current deviation control output of the inversion side is not changed, and delta gamma is not inputt。
2. The method as claimed in claim 1, wherein the sampling frequency f in the data acquisition in step a is the same as the sampling frequency f1Is 1 kHz.
3. The method as claimed in claim 1, wherein Δ t in the preset duration of the stretching circuit in step B2 is 0.5 s.
4. The method as claimed in claim 1, wherein the current is used for suppressing the subsequent commutation failureThe deviation control optimization method is characterized in that the proportional coefficient k of the inverter side constant turn-off angle control PI link in the step C1p,G0.7506, the reference value of the turn-off angle gammanAt 0.2618rad, response stability factor krel1Value range of 1<krel1<1.3。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115207958A (en) * | 2022-08-17 | 2022-10-18 | 华北电力大学 | Current deviation control method and system based on deep reinforcement learning |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018040466A1 (en) * | 2016-08-27 | 2018-03-08 | 许继集团有限公司 | Direct-current fault ride-through method and computer storage medium |
| CN109742786A (en) * | 2019-01-10 | 2019-05-10 | 天津大学 | The electrically continuous preventive control for commutation failure method of high-voltage dc transmission based on fuzzy control |
| CN111007360A (en) * | 2019-12-27 | 2020-04-14 | 新疆大学 | Extra-high voltage direct current transmission system commutation failure judgment method considering current change |
| CN111864738A (en) * | 2020-07-23 | 2020-10-30 | 华中科技大学 | Continuous commutation failure suppression method and device based on adaptive trigger angle compensation |
| CN112803467A (en) * | 2021-01-05 | 2021-05-14 | 西南交通大学 | Shutdown angle control method for reducing subsequent commutation failure of high-voltage direct-current transmission system |
| CN113098045A (en) * | 2021-04-02 | 2021-07-09 | 合肥工业大学 | Optimization control method suitable for UHVDC commutation failure fault recovery |
| CN113131506A (en) * | 2021-04-15 | 2021-07-16 | 云南电网有限责任公司电力科学研究院 | Constant turn-off angle control method and stabilizer for inhibiting subsequent commutation failure of LCC-HVDC system |
-
2021
- 2021-07-29 CN CN202110863083.7A patent/CN113595127B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018040466A1 (en) * | 2016-08-27 | 2018-03-08 | 许继集团有限公司 | Direct-current fault ride-through method and computer storage medium |
| CN109742786A (en) * | 2019-01-10 | 2019-05-10 | 天津大学 | The electrically continuous preventive control for commutation failure method of high-voltage dc transmission based on fuzzy control |
| CN111007360A (en) * | 2019-12-27 | 2020-04-14 | 新疆大学 | Extra-high voltage direct current transmission system commutation failure judgment method considering current change |
| CN111864738A (en) * | 2020-07-23 | 2020-10-30 | 华中科技大学 | Continuous commutation failure suppression method and device based on adaptive trigger angle compensation |
| CN112803467A (en) * | 2021-01-05 | 2021-05-14 | 西南交通大学 | Shutdown angle control method for reducing subsequent commutation failure of high-voltage direct-current transmission system |
| CN113098045A (en) * | 2021-04-02 | 2021-07-09 | 合肥工业大学 | Optimization control method suitable for UHVDC commutation failure fault recovery |
| CN113131506A (en) * | 2021-04-15 | 2021-07-16 | 云南电网有限责任公司电力科学研究院 | Constant turn-off angle control method and stabilizer for inhibiting subsequent commutation failure of LCC-HVDC system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115207958A (en) * | 2022-08-17 | 2022-10-18 | 华北电力大学 | Current deviation control method and system based on deep reinforcement learning |
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