CN112491077A - Control method and device of distributed series compensator - Google Patents
Control method and device of distributed series compensator Download PDFInfo
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- CN112491077A CN112491077A CN202011212971.4A CN202011212971A CN112491077A CN 112491077 A CN112491077 A CN 112491077A CN 202011212971 A CN202011212971 A CN 202011212971A CN 112491077 A CN112491077 A CN 112491077A
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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 control method of a distributed series compensator, which comprises the following steps: charging the power supply of the control unit through the energy taking unit; sequentially executing the operation of starting charging the current conversion unit of the unit module of the current stage by first-class bypass equipment which separates the unit module of the current stage on each unit module of the current stage, wherein the operation interval of each unit module of the current stage is a preset time threshold; and after the direct-current voltage of the current-stage unit module is charged to the set first voltage threshold, unlocking the current conversion unit of the current-stage unit module, and continuing to charge the current conversion unit of the current-stage unit module to the set second voltage threshold. The shutdown process comprises: and gradually reducing the output alternating-current voltages of all the unit modules of the series compensator to zero, then locking all the unit modules, closing the mechanical bypass switches of all the unit modules and stopping the operation. The method can effectively reduce the disturbance to the alternating current power grid when the distributed series compensator is started and stopped, prevent the direct current overvoltage of the unit module, and realize stable starting and stopping.
Description
Technical Field
The invention relates to a flexible alternating current transmission technology, in particular to a control method and a control device of a distributed series compensator.
Background
With the interconnection of large-scale power systems and the use of various new devices, the scale and complexity of the power systems are increased while the power generation and transmission are more economical and efficient; in addition, a large number of distributed power generation systems are connected into a power grid, so that the traditional fixed power flow transmitted from the power transmission network to the power distribution network is reversed; the continuous increase of user load requires a power flow control means to improve the existing power transmission capability; the complex exchange of power between the booming smart grid and the electricity market requires frequent tidal current optimization control.
The distributed series compensator can be used for making each small-capacity compensator light and handy to be directly and distributively hung on a power line, achieves a power flow control function and effect similar to those of a static synchronous series compensator, can provide a more flexible and advanced control means for a smart power grid, and effectively improves the power supply capacity and safety and stability of a power system. The distributed series compensator has the characteristics of small volume, light weight and the like; the redundancy of the equipment is guaranteed by a large number of distributed subunits, so that the reliability of the device is improved; meanwhile, the distributed series compensator device can be dispersedly deployed on a transmission line or a transformer substation, and occupies a small area.
At present, the foreign countries have two demonstration project (distributed static synchronous series compensator) projects of the distributed series compensator, the control and protection systems of the two projects are simple, the two projects adopt a module local control mode, the control mode is inflexible, and the performance of power flow regulation is poor. In China, a plurality of distributed series compensators (distributed series reactors, distributed static synchronous series compensators, distributed tidal current controllers and the like) are developed by some colleges and scientific research institutions, researches are mainly carried out on topological structures, simulation modeling and system control strategies, and documents and patents related to smooth starting and stopping of the distributed series compensators do not exist.
The series side converter unit or the static series compensator of the existing unified power flow controller can be charged through a parallel voltage source and then smoothly started, and can also be charged and started through a voltage difference generated after a series transformer is injected into a line; both of these approaches are not suitable for decentralized arrangements, cannot add a parallel side auxiliary power supply, and do not include a distributed series compensator of series transformers.
A common distributed series compensator structure is shown in fig. 1 and comprises N levels of unit modules, wherein each level of unit module comprises three unit modules which are respectively and correspondingly connected into a three-phase alternating current circuit, and the N levels of unit modules are sequentially connected into the circuit in series; the unit module comprises a first-class bypass device, an energy taking unit, a current converting unit and a control unit. The general starting mode and the shutdown mode are as follows: when the module is started, all the unit modules are charged after the unit modules control the power supply to finish energy taking, and then the direct-current voltages of the current conversion units and the control unit modules of the module are unlocked to be kept constant after the module is charged; and directly locking the current conversion unit of the unit module and bypassing the bypass equipment of the unit module when the operation is stopped. The starting and stopping mode has great change in the line current at the moment of the starting and stopping of all the unit modules and in the charging process of the unit modules, and has great influence on the tide of an alternating current system.
In order to overcome the defects of the starting and stopping modes, reduce the disturbance of the starting and stopping on the alternating current system, fully exert the characteristic of the load flow optimization of the distributed series compensator, and promote the rapid development of the application of the distributed load flow controller, a more stable starting and stopping mode which is more suitable for engineering application is needed.
Disclosure of Invention
The invention aims to provide a control method and a control device for a distributed series compensator, which can effectively inhibit direct-current overvoltage and overcurrent during the switching on and off of a unit module, reduce the current disturbance of an alternating-current circuit during the starting and the stopping, realize the stable starting and the stopping of the distributed series compensator and improve the stability and the reliability of a system.
In order to achieve the above purpose, the solution of the invention is:
on one hand, the application provides a control method of a distributed series compensator, the distributed series compensator comprises N levels of unit modules, each level comprises three unit modules which are respectively and correspondingly connected with a three-phase alternating current circuit, the N levels of unit modules are sequentially connected with the circuit in series, and N is a natural number; the unit module comprises a first-class bypass device, an energy obtaining unit, a current conversion unit and a control unit; when the distributed series compensator starts, the following control method is adopted:
after receiving a starting command, charging a power supply of the control unit through the energy taking unit;
sequentially executing the operation of starting charging the current conversion unit of the unit module of the current stage by first-class bypass equipment which separates the unit module of the current stage on each unit module of the current stage, wherein the operation interval of each unit module of the current stage is a preset time threshold;
and after the direct-current voltage of the current-stage unit module is charged to the set first voltage threshold, unlocking the current conversion unit of the current-stage unit module, continuing to charge the current conversion unit of the current-stage unit module, and controlling the direct-current voltage of the current-stage unit module to be charged to the set second voltage threshold.
In a preferred scheme, after each stage of unit module unlocks the current conversion unit, the direct-current voltage of the unit module at the current stage is controlled to be charged to a set third voltage threshold, and then the direct-current voltage of the unit module at the current stage is controlled to be gradually charged to a set second voltage threshold; the third voltage threshold is greater than the first voltage threshold and less than the second voltage threshold.
In a preferred scheme, the distributed series compensator further comprises a second type of bypass equipment, and the second type of bypass equipment is connected in parallel with the branches after all the N-level unit modules are connected in series; after receiving the starting command, the control method firstly separates the second type of bypass equipment and then charges the power supply of the control unit through the energy taking unit.
In a preferred embodiment, the bypass device of the first type is a mechanical switch or a fast switch formed by power electronics.
In a preferred embodiment, the second bypass device is a fast mechanical bypass switch, and the closing time of the fast mechanical bypass switch is shorter than the opening time.
In a preferred scheme, the first voltage threshold is greater than the minimum direct-current voltage at which the commutation unit can be successfully unlocked; the second voltage threshold is not larger than the nominal direct current voltage of the commutation unit capable of normally operating.
In a preferred scheme, when the distributed series compensator is shut down, the following control method is adopted:
after receiving the shutdown command, gradually reducing the alternating-current voltage output by each level of unit module;
and after the alternating-current voltages output by all the unit modules are reduced to zero, the first-class bypass equipment of all the unit modules is switched on, and the shutdown process is completed.
In a preferred scheme, the distributed series compensator further comprises a second type of bypass equipment, and the second type of bypass equipment is connected in parallel with the branches after all the N-level unit modules are connected in series; when the distributed series compensator stops running, the control method simultaneously closes the first type of bypass equipment and the second type of bypass equipment of all the unit modules after the alternating-current voltages output by all the unit modules are reduced to zero, and the running stopping process is completed.
On the other hand, the application also provides a control device of the distributed series compensator, the distributed series compensator comprises N levels of unit modules, each level of unit module comprises three unit modules which are respectively and correspondingly connected into a three-phase alternating current circuit, the N levels of unit modules are sequentially connected into the circuit in series, and N is a natural number; the unit module comprises a first-class bypass device, an energy obtaining unit, a current conversion unit and a control unit; the control device includes: the charging control module and the grading starting module; wherein
The charging control module is used for charging the power supply of the control unit through the energy acquisition unit after receiving the starting command;
the hierarchical starting module is used for sequentially executing the operation of starting charging the current conversion unit of the unit module of the current stage by the first type of bypass equipment which separates the unit module of the current stage to the unit modules of each stage, and the operation interval of each stage of unit module is a preset time threshold; and after the direct-current voltage of the current-stage unit module is charged to the set first voltage threshold, unlocking the current conversion unit of the current-stage unit module, continuing to charge the current conversion unit of the current-stage unit module, and controlling the direct-current voltage of the current-stage unit module to be charged to the set second voltage threshold.
In a preferred scheme, in the hierarchical starting module, after each level of unit module unlocks the current conversion unit, the direct current voltage of the level of unit module is controlled to be charged to a set third voltage threshold, and then the direct current voltage of the level of unit module is controlled to be gradually charged to a set second voltage threshold; the third voltage threshold is greater than the first voltage threshold and less than the second voltage threshold.
In a preferred scheme, the control device further comprises a pressure reduction control module and a shutdown control module;
the voltage reduction control module is used for gradually reducing the alternating-current voltage output by each level of unit module after receiving the shutdown command;
and the shutdown control module is used for switching on the first type of bypass equipment of all the unit modules after the alternating-current voltages output by all the unit modules are reduced to zero, so as to finish the shutdown process.
By adopting the scheme, the invention can realize the stable start and stop of the distributed series compensator: when the circuit is started, the current conversion units of each unit module are gradually put into the circuit in a grading manner, and the current conversion units are unlocked after the minimum direct-current voltage which can be successfully unlocked by a certain current conversion unit is reached, so that the current and power surge of an alternating-current power grid when a plurality of unit modules are suddenly connected into the circuit can be avoided, and the large fluctuation of the circuit power caused by the fact that the unit modules are serially connected into a capacitor of the circuit for a long time can be avoided; in addition, a third voltage threshold is adopted for voltage reduction unlocking during starting, so that overvoltage impact on the unit module possibly caused by adopting a nominal direct-current voltage for unlocking is avoided; when the operation is stopped, the alternating current voltage output by each unit module is gradually reduced to zero under the control of the unit modules, and then the unit modules are withdrawn, so that the impact on an alternating current power grid caused by the direct operation stop of the distributor series compensator is avoided. By adopting the starting and stopping scheme, the stability and the reliability of the distributed series compensator can be improved.
Drawings
Fig. 1 is a block diagram of a distributed series compensator provided in an embodiment of the present application;
FIG. 2 is a block diagram of a distributed series compensator incorporating a second type of bypass device;
FIG. 3 is a computer-implemented flowchart of a control method for startup of a distributed series compensator according to an embodiment of the present application;
FIG. 4 is a computer-implemented flowchart of a control method for shutdown of a distributed series compensator according to an embodiment of the present application;
FIG. 5 is a computer-implemented flowchart illustrating a control method for startup of the distributed series compensator after increasing the third voltage threshold according to another embodiment of the present application;
FIG. 6 is a computer-implemented flowchart of a control method for starting up a distributed cascade compensator after adding a second type of bypass device according to an embodiment of the present application;
fig. 7 is a computer-implemented flowchart of a control method for shutdown of a distributed series compensator after adding a second type of bypass device according to an embodiment of the present application.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The invention provides a starting method and a stopping method of a distributed series compensator, wherein the distributed series compensator is a structure diagram of the distributed series compensator provided by the embodiment of the application as shown in figure 1, the distributed series compensator comprises N levels of unit modules, each level comprises three unit modules which are respectively and correspondingly connected into a three-phase alternating current circuit, the N levels of unit modules are sequentially connected into the circuit in series, and N is a natural number; the unit module comprises a first-class bypass device, an energy taking unit, a current converting unit and a control unit.
In a control method of a distributed series compensator provided in a first embodiment of the present application, when the distributed series compensator is started, the following steps are adopted:
and S110, after receiving the starting command, charging the power supply of the control unit through the energy obtaining unit.
S120, sequentially executing the operation of starting charging the current conversion unit of the unit module by the first type of bypass equipment which separates the unit module at the current level on each unit module at each level, wherein the operation interval of each unit module at each level is a preset time threshold; meanwhile, after the direct-current voltage of the current-stage unit module is charged to the set first voltage threshold, the current conversion unit of the current-stage unit module is unlocked, the current conversion unit of the current-stage unit module is continuously charged, and the direct-current voltage of the current-stage unit module is controlled to be charged to the set second voltage threshold.
In a preferred embodiment, after each stage of unit module unlocks the commutation unit, the direct-current voltage of the unit module at the current stage is controlled to be charged to a set third voltage threshold, and then the direct-current voltage of the unit module at the current stage is controlled to be gradually charged to a set second voltage threshold; the third voltage threshold is greater than the first voltage threshold and less than the second voltage threshold.
Fig. 3 is a computer-implemented flowchart illustrating a control method for starting the distributed series compensator according to a second embodiment of the present application. The method comprises the following steps:
(a1) after receiving the starting command, charging the power supply of the control unit through the energy taking unit, and entering a step (a2) after the charging is finished;
(a2) separating the first class bypass equipment of the first-stage unit module, charging the converter unit of the first-stage unit module, and after a set delay T, entering the step (a 3); meanwhile, after the direct-current voltage of the first-stage unit module is charged to a set first voltage threshold, a current conversion unit of the first-stage unit module is unlocked, and the direct-current voltage of the first-stage unit module is controlled to a set second voltage threshold;
(a3) separating the first class bypass equipment of the second-stage unit module, charging the commutation unit of the second-stage unit module, and after a set delay T, entering the step (a 4); meanwhile, after the direct current voltage of the second-level unit module is charged to the set first voltage threshold, the current conversion unit of the second-level unit module is unlocked, and the direct current voltage of the second-level unit module is controlled to the set second voltage threshold;
(a4) sequentially dividing the first-type bypass devices of the third-stage to Nth-stage unit modules according to the step (a2) and the step (a3) and the set delay T; sequentially charging the direct-current voltages of the third-level to nth-level unit modules to a set second voltage threshold, and entering the step (a 5);
(a5) and after the direct-current voltage of the first-stage to Nth-stage unit modules reaches a set second voltage threshold, the distributed series compensator finishes the starting process and enters a normal operation mode.
The first voltage threshold is greater than the minimum direct current voltage of the commutation unit which can be successfully unlocked; the second voltage threshold is not greater than a nominal dc voltage at which the commutation cell can operate normally.
Fig. 4 is a computer-implemented flowchart illustrating a control method for shutdown of a distributed series compensator according to a third embodiment of the present application. The method comprises the following steps:
(b1) after receiving the shutdown command, gradually reducing the alternating-current voltage output by each level of unit module;
(b2) and after the alternating-current voltages output by all the unit modules are reduced to zero, the first-class bypass equipment of all the unit modules is switched on, and the shutdown process is completed.
Fig. 5 is a computer-implemented flowchart illustrating a control method for starting up a distributed series compensator after increasing a third voltage threshold according to another embodiment of the present application; comprises the following steps:
(a1) after receiving the starting command, charging the power supply of the control unit through the energy taking unit, and entering a step (a2) after the charging is finished;
(a2) separating first-class bypass equipment of the first-stage unit module, charging a commutation unit of the first-stage unit module, entering the step (a3) after a set delay T, unlocking the commutation unit of the first-stage unit module after the direct-current voltage of the first-stage unit module is charged to a set first voltage threshold, controlling the direct-current voltage of the first-stage unit module to be charged to a set third voltage threshold, and then controlling the direct-current voltage of the first-stage unit module to be gradually charged to a set second voltage threshold;
(a3) separating the first class bypass equipment of the second-level unit module, charging the commutation unit of the second-level unit module, entering the step (a4) after a set delay T, unlocking the commutation unit of the second-level unit module after the direct-current voltage of the second-level unit module is charged to a set first voltage threshold, controlling the direct-current voltage of the second-level unit module to be charged to a set third voltage threshold, and then controlling the direct-current voltage of the first-level unit module to be gradually charged to a set second voltage threshold;
(a4) sequentially dividing the first-type bypass devices of the third-stage to Nth-stage unit modules according to the step (a2) and the step (a3) and the set delay T; gradually charging the direct-current voltages of the third-level to nth-level unit modules to a set second voltage threshold value in sequence, and entering the step (a 5);
(a5) and after the direct-current voltage of the first-stage to Nth-stage unit modules reaches a set second voltage threshold, the distributed series compensator finishes the starting process and enters a normal operation mode.
The delay T between the first bypass devices separating the different levels of cell modules is greater than the time for the cell modules to charge to the first voltage threshold. The third voltage threshold is greater than the first voltage threshold and less than the second voltage threshold.
Fig. 2 is another solution of the distributed series compensator, which includes a second type of bypass device, and the second type of bypass device is connected in parallel with the branches after all the N-level cell modules are connected in series. The first type of bypass equipment is a mechanical switch or a quick switch composed of power electronic devices, and the closing time is less than 10 ms; the second type of bypass equipment is a fast mechanical bypass switch, and the closing time of the bypass equipment is faster than the opening time, and is about 40 ms.
Fig. 6 and fig. 7 are computer-implemented flowcharts illustrating a control method for starting and stopping a distributed series compensator after adding a second type of bypass device according to an embodiment of the present application.
Compared to not including the second type of bypass device, step (a1) of the startup method is: after receiving the starting command, separating the second type of bypass equipment, charging the power supply of the control unit through the energy obtaining unit, and entering the step (a2) after the charging is finished; step (b1) of the shutdown method is: and after the alternating-current voltages output by all the unit modules are reduced to zero, closing the first type of bypass equipment and the second type of bypass equipment of all the unit modules simultaneously to finish the shutdown process.
In this example, all the start-up schemes are described for the case where all the cell modules are normal, and if some of the cell modules have a fault, the start-up scheme skips the start-up delay T set for the faulty cell module and does not perform the start-up operation on the faulty cell module, or retains the start-up delay T set for the faulty cell module and does not perform the start-up operation on the faulty cell module (that is, the normal cell module starts to start up with a fixed delay after receiving the start-up command regardless of whether any cell module has a fault). If the unit module has a fault in the starting or stopping process, the unit module automatically exits without influencing the starting and stopping of other unit modules.
The control device of distributed series compensator that this application embodiment provided includes: the charging control module and the grading starting module; wherein
The charging control module is used for charging the power supply of the control unit through the energy acquisition unit after receiving the starting command;
the hierarchical starting module is used for sequentially executing the operation of starting charging the current conversion unit of the unit module of the current stage by the first type of bypass equipment which separates the unit module of the current stage to the unit modules of each stage, and the operation interval of each stage of unit module is a preset time threshold; and after the direct-current voltage of the current-stage unit module is charged to the set first voltage threshold, unlocking the current conversion unit of the current-stage unit module, continuing to charge the current conversion unit of the current-stage unit module, and controlling the direct-current voltage of the current-stage unit module to be charged to the set second voltage threshold.
In a preferred embodiment, in the hierarchical starting module, after each level of unit module unlocks the commutation unit, the direct current voltage of the level of unit module is controlled to be charged to a set third voltage threshold, and then the direct current voltage of the level of unit module is controlled to be gradually charged to a set second voltage threshold; the third voltage threshold is greater than the first voltage threshold and less than the second voltage threshold.
In a preferred embodiment, the control device further comprises a pressure reduction control module and a shutdown control module;
the voltage reduction control module is used for gradually reducing the alternating-current voltage output by each level of unit module after receiving the shutdown command;
and the shutdown control module is used for switching on the first type of bypass equipment of all the unit modules after the alternating-current voltages output by all the unit modules are reduced to zero, so as to finish the shutdown process.
In this embodiment, the first voltage threshold, the second voltage threshold, the third voltage threshold and the fixed delay T are different in voltage threshold and different in fixed delay T for different projects and different distributed unit modules, which is a known technology and is not described again.
The present invention is described with respect to embodiments comprising a single distributed series compensator, but the invention is not limited to series compensator systems of this configuration and is applicable to distributed compensators comprising series coupled transformers or comprising parallel compensator apparatus. Any method involving staged starting, or sub-module staged charging, sub-voltage staged unlocking, is within the scope of the present invention.
Finally, it should be noted that: the technical solutions of the present invention are only illustrated in conjunction with the above-mentioned embodiments, and not limited thereto. Those of ordinary skill in the art will understand that: modifications and equivalents may be made to the embodiments of the invention by those skilled in the art, which modifications and equivalents are within the scope of the claims appended hereto.
Claims (11)
1. A control method of a distributed series compensator is characterized in that:
the distributed series compensator comprises N levels of unit modules, each level of unit module comprises three unit modules which are respectively and correspondingly connected into a three-phase alternating current circuit, the N levels of unit modules are sequentially connected into the circuit in series, and N is a natural number; the unit module comprises a first-class bypass device, an energy obtaining unit, a current conversion unit and a control unit; when the distributed series compensator starts, the following control method is adopted:
after receiving a starting command, charging a power supply of the control unit through the energy taking unit;
sequentially executing the operation of starting charging the current conversion unit of the unit module of the current stage by first-class bypass equipment which separates the unit module of the current stage on each unit module of the current stage, wherein the operation interval of each unit module of the current stage is a preset time threshold;
and after the direct-current voltage of the current-stage unit module is charged to the set first voltage threshold, unlocking the current conversion unit of the current-stage unit module, continuing to charge the current conversion unit of the current-stage unit module, and controlling the direct-current voltage of the current-stage unit module to be charged to the set second voltage threshold.
2. The control method of a distributed series compensator as claimed in claim 1, characterized by:
after each stage of unit module unlocks the current conversion unit, the direct-current voltage of the unit module at the current stage is controlled to be charged to the set third voltage threshold, and then the direct-current voltage of the unit module at the current stage is controlled to be gradually charged to the set second voltage threshold;
the third voltage threshold is greater than the first voltage threshold and less than the second voltage threshold.
3. The control method of a distributed series compensator as claimed in claim 1, characterized by:
the distributed series compensator also comprises a second type of bypass equipment, and the second type of bypass equipment is connected in parallel with the branches after all the N-level unit modules are connected in series;
after receiving the starting command, the control method firstly separates the second type of bypass equipment and then charges the power supply of the control unit through the energy taking unit.
4. The control method of a distributed series compensator as claimed in claim 1, characterized by:
the first type of bypass device is a mechanical switch or a fast switch made of power electronics.
5. A control method of a distributed series compensator as claimed in claim 3, characterized by:
the second type of bypass equipment is a quick mechanical bypass switch, and the closing time of the quick mechanical switch is shorter than the opening time.
6. The control method of a distributed series compensator as claimed in claim 1, characterized by:
the first voltage threshold is larger than the minimum direct current voltage of the commutation unit which can be successfully unlocked; the second voltage threshold is not larger than the nominal direct current voltage of the commutation unit capable of normally operating.
7. The control method of a distributed series compensator as claimed in claim 1, characterized by: when the distributed series compensator stops running, the following control method is adopted:
after receiving the shutdown command, gradually reducing the alternating-current voltage output by each level of unit module;
and after the alternating-current voltages output by all the unit modules are reduced to zero, the first-class bypass equipment of all the unit modules is switched on, and the shutdown process is completed.
8. The control method of a distributed series compensator as claimed in claim 7, characterized in that: the distributed series compensator also comprises a second type of bypass equipment, and the second type of bypass equipment is connected in parallel with the branches after all the N-level unit modules are connected in series;
when the distributed series compensator stops running, the control method simultaneously closes the first type of bypass equipment and the second type of bypass equipment of all the unit modules after the alternating-current voltages output by all the unit modules are reduced to zero, and the running stopping process is completed.
9. A control device of a distributed series compensator is characterized in that: the distributed series compensator comprises N levels of unit modules, each level of unit module comprises three unit modules which are respectively and correspondingly connected into a three-phase alternating current circuit, the N levels of unit modules are sequentially connected into the circuit in series, and N is a natural number; the unit module comprises a first-class bypass device, an energy obtaining unit, a current conversion unit and a control unit; the control device includes: the charging control module and the grading starting module; wherein
The charging control module is used for charging the power supply of the control unit through the energy acquisition unit after receiving the starting command;
the hierarchical starting module is used for sequentially executing the operation of starting charging the current conversion unit of the unit module of the current stage by the first type of bypass equipment which separates the unit module of the current stage to the unit modules of each stage, and the operation interval of each stage of unit module is a preset time threshold; and after the direct-current voltage of the current-stage unit module is charged to the set first voltage threshold, unlocking the current conversion unit of the current-stage unit module, continuing to charge the current conversion unit of the current-stage unit module, and controlling the direct-current voltage of the current-stage unit module to be charged to the set second voltage threshold.
10. The control device of a distributed series compensator as claimed in claim 9, wherein:
in the grading starting module, after each grade of unit module unlocks the current conversion unit, the direct-current voltage of the current conversion unit module is firstly controlled to be charged to a set third voltage threshold, and then the direct-current voltage of the current conversion unit module is gradually controlled to be charged to a set second voltage threshold; the third voltage threshold is greater than the first voltage threshold and less than the second voltage threshold.
11. The control device of a distributed series compensator as claimed in claim 9, wherein: the control device also comprises a voltage reduction control module and a shutdown control module;
the voltage reduction control module is used for gradually reducing the alternating-current voltage output by each level of unit module after receiving the shutdown command;
and the shutdown control module is used for switching on the first type of bypass equipment of all the unit modules after the alternating-current voltages output by all the unit modules are reduced to zero, so as to finish the shutdown process.
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| CN202011212971.4A CN112491077B (en) | 2020-11-03 | 2020-11-03 | Control method and device of distributed series compensator |
| PCT/CN2021/113298 WO2022095545A1 (en) | 2020-11-03 | 2021-08-18 | Method and apparatus for controlling distributed series compensator, and computer-readable medium |
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| CN202011212971.4A CN112491077B (en) | 2020-11-03 | 2020-11-03 | Control method and device of distributed series compensator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022095545A1 (en) * | 2020-11-03 | 2022-05-12 | 南京南瑞继保电气有限公司 | Method and apparatus for controlling distributed series compensator, and computer-readable medium |
| WO2022194196A1 (en) * | 2021-03-18 | 2022-09-22 | 南京南瑞继保电气有限公司 | Coordinated control method and system of distributed compensator, and computer device and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104134998A (en) * | 2014-08-05 | 2014-11-05 | 南京南瑞继保电气有限公司 | Starting method and stopping method for static synchronous series compensator |
| CN107947173A (en) * | 2017-12-20 | 2018-04-20 | 南京南瑞继保电气有限公司 | A kind of series compensator and control method |
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| CN104134998A (en) * | 2014-08-05 | 2014-11-05 | 南京南瑞继保电气有限公司 | Starting method and stopping method for static synchronous series compensator |
| CN107947173A (en) * | 2017-12-20 | 2018-04-20 | 南京南瑞继保电气有限公司 | A kind of series compensator and control method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022095545A1 (en) * | 2020-11-03 | 2022-05-12 | 南京南瑞继保电气有限公司 | Method and apparatus for controlling distributed series compensator, and computer-readable medium |
| WO2022194196A1 (en) * | 2021-03-18 | 2022-09-22 | 南京南瑞继保电气有限公司 | Coordinated control method and system of distributed compensator, and computer device and storage medium |
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