CN105552916A - UPFC (unified power flow controller) system-level control method with circuit power out-of-limit control function - Google Patents
UPFC (unified power flow controller) system-level control method with circuit power out-of-limit control function Download PDFInfo
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Abstract
The invention discloses a UPFC (unified power flow controller) system-level control method with a circuit power out-of-limit control function. A UPFC cross-section power flow control function is realized through a cross-section power flow control policy; the real power of a controlled cross section is controlled to be less than a reasonable power set value rapidly according to a dispatching instruction under a normal operating state of a power grid so as to ensure that a power transmission line that is connected with the controlled cross section in parallel can satisfy N-1 verification; when a power transmission line on the controlled cross section, or a power transmission line connected with the controlled cross section in series is in a power out-of-limit state caused by faults or change of working conditions, power deviation dP2 capable of reflecting the out-of-limit conditions of the lines and generated by a line power out-of-limit control module is overlaid, so as to automatically generate an UPFC control instruction that can satisfy the safe operating requirements of the power grid; the cross-section power flow control requirements can be satisfied under the premise of ensuring that the line is not overloaded preferentially; and due to the UPFC system-level control method, the flexibility in dispatching is improved, the complexity of the power grid operation is lowered, and the reliability of the power grid operation is improved.
Description
Technical Field
The invention belongs to the technical field of flexible power transmission and distribution of an electric power system, and particularly relates to a UPFC system level control method with a line power out-of-limit control function.
Background
The development of the power system to a large-scale interconnected power grid becomes a common trend of the development of modern power systems of various countries in the world, and the formation of the interconnected power grid makes the power grid structure increasingly complex and the operation increasingly heavy. To meet the development needs of power systems, flexible ac transmission system (FACTS) technology is rapidly developed. A Unified Power Flow Controller (UPFC) is used as a latest generation FACTS device, so that accurate control of power flow can be realized, and the transmission power limit of a section is improved; dynamic voltage support can be provided, and the voltage stability of the system is improved; meanwhile, the system damping can be improved, and the dynamic characteristic of the system can be improved. Therefore, the reasonable installation of the unified power flow controller has very important significance for the development of the power grid in China.
As shown in fig. 1, the UPFC is composed of two back-to-back voltage source converters sharing a dc bus and a dc capacitor, both of which are connected to the system through a converter transformer, wherein the converter transformers of the converter 2 are connected in series. Active power can flow freely in either direction between the two converters, and the ac output of each converter can also independently generate or absorb reactive power. The converter 2 in the UPFC has the function of injecting voltage vectors with controllable amplitude and phase angles into a circuit through a series transformer, namely, the voltage, impedance and phase angles on the circuit can be simultaneously or selectively adjusted; the function of the converter 1 is to provide or absorb the active power required by the converter 2 on the common dc bus to maintain active power exchange between the series injection voltage and the line. In the UPFC, besides the converter 2 can exchange active power and reactive power with the system, if necessary, the converter 1 can also simultaneously generate or absorb controllable reactive power to provide independent parallel reactive power compensation for the line.
The principle of setting the control target value of the unified power flow controller in the normal operation state of the power grid and the occurrence of the N-1 fault is one of the practical engineering difficulties. The establishment of a reasonable system-level control strategy is the work which must be completed before the UPFC device is put into operation. In academia, most researches on the unified power flow controller are focused on the aspects of UPFC system modeling, power flow control strategies and the like. In engineering, the application of UPFC engineering is still blank in China, and 3 sets of UPFC devices are put into operation in foreign countries, but the referenced engineering experience is still lacked. The traditional UPFC device is directly installed on a controlled section, a dispatcher remotely gives a power set value of the controlled section, and when the line power is out of limit due to a fault or a change of working conditions, the dispatcher is required to remotely change the power set value of the controlled section; under different operating conditions, the power set value of the controlled section given by the dispatcher cannot ensure that the line power does not exceed the limit. This greatly increases the complexity of the grid operation and also reduces the reliability of the grid operation. Meanwhile, limited by the floor area occupied by the UPFC device project, the UPFC device cannot be installed on the controlled section in the actual project, and at the moment, the UPFC device installed near the controlled section needs to be controlled to achieve the section flow control effect. Therefore, it is necessary to develop a UPFC system-level control strategy with line power override control function that can be used in engineering.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a UPFC system level control method with a line power over-limit control function, which meets the requirements of section flow control as far as possible on the premise of preferentially ensuring that a line is not overloaded, not only increases the scheduling flexibility, but also reduces the complexity of the operation of a power grid and improves the reliability of the operation of the power grid.
A UPFC system level control method with line power out-of-limit control function is realized by combining a section power flow control strategy and a line power out-of-limit control module; the UPFC system-level control method realizes the UPFC section flow control function through a section flow control strategy, and under the normal operation state of a power grid, the actual power of a controlled section is quickly controlled below a reasonable power set value according to a scheduling instruction, so that the power transmission line connected with the controlled section in parallel meets N-1 check; when the power of the transmission line on the controlled section or the transmission line connected with the controlled section in series exceeds the limit due to the fault or the change of the working condition, a power deviation dP2 which is generated by the line power out-of-limit control module and can reflect the line out-of-limit condition is superposed, so that a UPFC control instruction which meets the requirement of safe and stable operation of a power grid is automatically generated, and the requirement of the section flow control is met on the premise of preferentially ensuring that the line is not overloaded.
The specific process of the section flow control strategy is as follows:
1.1, calculating a power deviation dP1 between the set power and the actual power of the controlled section;
1.2, superposing the power of a UPFC installation line, the power deviation dP1 and the power deviation dP2, and obtaining an active power instruction value of the UPFC through an amplitude limiting link;
1.3 calculating a reactive power instruction value of the UPFC by utilizing the active power instruction value according to a set line power factor;
and 1.4, controlling the UPFC through a related control algorithm according to the active power instruction value and the reactive power instruction value of the UPFC.
The set power of the controlled section in step 1.1 can ensure that the power transmission lines connected in parallel with the controlled section meet N-1 checking, that is, when the controlled section operates at the set power, any power transmission line connected in parallel with the controlled section has an N-1 fault, and then the power of other non-faulty parallel power transmission lines does not exceed respective power limit values.
In step 1.3, the reactive power instruction value of the UPFC is calculated by the following formula:
the specific process of the line power out-of-limit control module generating the power deviation dP2 is as follows:
2.1 monitoring the actual power of the power transmission line on the controlled section or the power transmission line connected with the controlled section in series, calculating the power deviation between the power limit value and the actual power of each monitored line, correspondingly taking the power deviation as the power margin of each monitored line for safe operation, and extracting the minimum value X of the power margin of all monitored lines for safe operation;
2.2 determining a selection signal Ctrl through logic judgment according to the power deviation dP1 and the power margin minimum value X;
2.3 determining the input of a PI (proportional integral) controller according to the selection signal Ctrl, and further generating the power deviation dP2 by using the output of the PI controller.
The specific logic judgment criteria in step 2.2 are as follows:
firstly, when the system is in a normal operation state, the actual power of each monitored line is lower than a power limit value, the minimum value X of the power margin is greater than 0, and the selection signal Ctrl is 0;
when the system has an N-1 fault or the monitored line is overloaded due to the change of working conditions, namely the actual power of the monitored line is higher than the power limit value, the minimum value X of the power margin is smaller than 0, and the selection signal Ctrl is 1;
and thirdly, when the actual power of the controlled section exceeds the set power and the actual power of each monitored line is lower than the power limit value, the power deviation dP1 is smaller than 0 and the power margin minimum value X is larger than 0, and the selection signal Ctrl is equal to 0 at the moment.
When the selection signal Ctrl is 0 in step 2.3, the input signal of the PI controller is 0; when the selection signal Ctrl is 1, the input signal of the PI controller is the minimum value X of the power margin and the power control margin P preset by the line power out-of-limit control modulemThe difference of (a).
When the actual power of the controlled section exceeds the set power and the actual power of each monitored line is lower than the power limit value, the selection signal Ctrl is 0, the input signal of the PI controller is changed into 0 again, and meanwhile the integrator in the PI controller is cleared.
In the second and third cases, the triggering of the selection signal Ctrl has a certain delay, that is, the selection signal Ctrl at a plurality of consecutive times is 0 or 1, and the selection signal Ctrl is actually performing corresponding selection triggering on the input of the PI controller.
Under the normal operation state of a power grid, the UPFC system-level control strategy provided by the invention can rapidly control the actual power of a controlled section to a section power set value according to a scheduling instruction, and ensures that a power transmission line connected in parallel with the UPFC control section meets N-1 checking; when a system fails or a power transmission line on the UPFC control section or connected with the UPFC control section in series is overloaded due to change of working conditions, a UPFC control instruction value meeting the requirement of safe and stable operation of a power grid is automatically generated, the requirement of section flow control is met as far as possible on the premise of preferentially ensuring that the line is not overloaded, and the automatic device for safety and stability can play a role. The invention not only increases the scheduling flexibility, but also can reduce the complexity of the operation of the power grid and improve the reliability of the operation of the power grid, and has important significance for the engineering practicality of the UPFC.
Drawings
Fig. 1 is a schematic structural view of a UPFC.
Fig. 2 is a simplified schematic diagram of an actual power grid.
Fig. 3 is a schematic diagram of the control principle of the flow control strategy of the UPFC section.
FIG. 4 is a schematic diagram of the control principle of the UPFC line power out-of-limit control module.
FIG. 5 is a schematic diagram illustrating the control principle of the UPFC system-level control strategy according to the present invention.
Fig. 6(a) is a schematic diagram of a power change curve of a section 1 when an N-1 fault occurs in an HF double-circuit line after the UPFC system level control strategy of the present invention is adopted.
FIG. 6(b) is a schematic diagram of a power change curve of the HF double-circuit line when the HF double-circuit line has an N-1 fault after the UPFC system level control strategy is adopted.
FIG. 7(a) is a schematic diagram of a power change curve of a section 1 when an N-1 fault occurs in the section 1 after the UPFC system level control strategy is adopted.
Fig. 7(b) is a schematic diagram of a power change curve of an HF double-circuit line when an N-1 fault occurs on the section 1 after the UPFC system level control strategy of the present invention is adopted.
Detailed Description
In order to more specifically describe the present invention, the following detailed description is provided for the technical solution of the present invention with reference to the accompanying drawings and the specific embodiments.
Fig. 2 is a simplified structure of a certain actual power grid, loads in a region are mainly supplied with power through a section 1 and a section 2, and currents in the two sections are not uniformly distributed and often encounter a power transmission bottleneck. The transmission power of the section 1 is about 600MW, the transmission power of the HF double-circuit line in the section 2 is about 780MW, and both transmission sections do not meet N-1 checking. Namely: after any one line in the BD or BC double-circuit lines quits operation due to faults, the power of the non-fault line exceeds the power limit value of the non-fault line; after any one line in the HF double-circuit line is out of operation due to faults, the power of a non-fault line exceeds the power limit value of the non-fault line. The power of the section 1 cannot be directly controlled by adding the power control module on BC and BD lines due to the limitation of the occupied area of UPFC system engineering. Through engineering site selection analysis, a UPFC device is additionally arranged on an AB line to control the power of the section 1, and the specific control method comprises the following steps:
(1) and (5) controlling the section flow.
The UPFC system level control strategy should first ensure that the UPFC can fulfill its load flow control requirements. Therefore, in the normal operation of the power grid, the UPFC should first be able to perform its cross-section flow function, i.e. to control the transmission power of the cross-section 1 to a set value. The UPFC profile flow control strategy is shown in fig. 3.
In FIG. 3, PsetAnd PaRespectively transmitting a set value and an actual value of the power of the section 1; dP1 is output by the section power control module and is assigned to signal a; pLPower is transmitted for the AB line; pmaxAnd PminRespectively an upper limit and a lower limit of the allowable operation power of the AB line; prefAnd QrefRespectively, the control target values of AB line power are UPFC active and reactive instruction values; wherein,is the power factor.
Under the normal operation state of the power grid, the formulated power flow control strategy can meet the UPFC power flow control requirement, so that the power flow of the section 1 is controlled at a set value, and the section 2 can meet the N-1 check. However, only using the line section power flow control strategy as a UPFC system level control strategy requires a dispatcher to remotely change the set value of the section power when the line power on the section 1 is out of limit due to a fault or a change of working conditions; meanwhile, under different operating conditions, the set value given by the dispatcher cannot guarantee that the line power can be controlled below the power limit value, so that the complexity of the operation of the power grid is greatly increased, and the reliability of the operation of the power grid is also reduced.
(2) And (4) line power out-of-limit control strategy.
In order to reduce the complexity of the operation of the power grid and improve the reliability of the operation of the power grid, when the line power on the section 1 is out of limit due to a fault or a change of working conditions, a UPFC system level control strategy should be capable of automatically generating a UPFC command value meeting the requirement of the safe and stable operation of the power grid. Therefore, a line power out-of-limit control module as shown in fig. 4 is added on the basis of the section power flow control strategy, and the specific control process is as follows:
2.1, monitoring the actual power of the power transmission line on the section 1, calculating the power deviation between the power limit value and the actual value of each monitored line, taking the power deviation as the margin index of the safe operation of each monitored line, and assigning the minimum value of the margin index of the safe operation of each monitored line to a signal B;
2.2 the signal A and the signal B are used as the input of the trigger module to jointly generate the input selection signal Ctrl of the PI controller of the line power out-of-limit control module. The control logic is as follows: under the normal operation state of the system, the power of the monitored line is lower than the power limit value, namely B is greater than 0, Ctrl is 0 at the moment, and the input signal of the PI controller is 0; when the system has N-1 fault or any monitored line is overloaded due to the change of working conditions, namely B is less than 0, Ctrl is 1 at the moment, and the input signal of the PI controller becomes a power deviation signal capable of reflecting the line out-of-limit condition; and thirdly, when the current of the controlled section exceeds the set value and the power of the monitored line is lower than the power limit value, namely A <0 and B >0, at the moment, CTRL is equal to 0, the input signal of the PI controller is changed into 0 again, and meanwhile, the integrator of the PI controller is cleared. In order to prevent the trigger module from frequently acting, the triggering and returning of the Ctrl signals in the second step and the third step are both delayed for a certain time, and the triggering or returning of the Ctrl signals can be caused only if the control logic is continuously satisfied in the set time delay.
2.3 to ensure that the operating power of the monitored line has a certain margin from the power limit value, P is added in the input link of the PI controllermThe signal is used as the control margin of the line power out-of-limit control module; the output of the PI controller is the output dP2 of the line power violation control module.
In FIG. 4, Plimt1And Plimit2BC, BD line power limits, respectively; pline1And Pline2BC, BD line real power, respectively.
(3) UPFC system level control strategy.
And integrating the section power flow control strategy and the line power out-of-limit control strategy. The embodiment proposes a set of UPFC system-level control strategies that not only meet the demand of system power flow control, but also have line power out-of-limit control capability, as shown in fig. 5:
3.1 under the normal operation state of the system, if the monitored line is not overloaded all the time, the output of the line power out-of-limit control module is 0, and the UPFC control target is generated by the section power control module, so as to ensure that the actual power of the section reaches the set value.
3.2 when monitoring that a certain line is overloaded, the line power out-of-limit control module outputs a power deviation signal capable of reflecting the line out-of-limit condition. The control instruction value of the UPFC device is generated by the section power control module and the line power out-of-limit control module together. Under the action of the line power out-of-limit control module PI controller, the power deviation signal dP2 will play a dominant role. At this time, the control command value generated by the UPFC system level control strategy will preferentially ensure that the power of the monitored line is lower than its power limit.
3.3 the section power set value in the system control strategy is remotely given by the dispatcher, if the section power does not reach the set value, the monitored line is overloaded, and the monitoring line is not overloaded as the priority control target, so that the dispatching flexibility can be increased, and the operation reliability of the power grid can not be damaged. When the UPFC installation line is overloaded, the power of the UPFC installation line is preferentially controlled not to exceed the power limit value of the UPFC installation line.
The transmission power setpoint P for section 1 in the system-level control strategy defined in this embodimentsetAnd (5) 750MW, transferring the tidal current of the HF double-circuit line to the section 1, and ensuring that the HF double-circuit line meets N-1 checking. BC. BD line Power Limit Plimt1And Plimit2Are all 45 MW; control margin P of line power out-of-limit control modulemIs 2 MW; upper and lower limits P of permitted operating power of AB linemaxAnd Pmin45MW and-45 MW respectively; the initial value of an input selection signal Ctrl of a PI controller of the line power out-of-limit control module is 0, and the time delay of triggering and returning is 0.5 s; the set power factor for the AB line power is 0.98. The gains of a proportional amplifier and an integrator in the PI controller of the line power out-of-limit control module are respectively 0.4 and 1.0.
Under the system level control strategy formulated in the present embodiment, the power change curves of the section 1 and the HF double-circuit line when the HF double-circuit line has an N-1 fault are shown in fig. 6. When a three-phase ground fault occurs in a 1 loop in the HF double loop, in order to ensure the safety of the UPFC device, the transformer bypass switch is conducted to bypass the series side converter, and after the fault is cut off, the UPFC device is put into operation again after a set time (1s) for ensuring the safety of the UPFC device. The simulation process is as follows: 2s, inputting a UPFC system level control strategy; when the HF loop circuit has a three-phase ground fault in 5s, the UPFC quits the operation; when the voltage is 5.1s, the HF1 return line is disconnected, and the fault is removed; at 6.1s the UPFC will be reentered.
Under the system level control strategy formulated in the present embodiment, the power change curves of the section 1 and the HF double-circuit line when the N-1 fault occurs in the section 1 are shown in fig. 7. The simulation process is as follows: 2s, inputting a UPFC system level control strategy; when the BD circuit has a three-phase ground fault in 5s, the UPFC quits the operation; when 5.1s, the BD line is disconnected, and the fault is removed; at 6.1s the UPFC will be reentered.
As can be seen from fig. 6 and 7, in the normal operation state of the power grid, the system-level control strategy formulated by the embodiment can rapidly control the actual power of the section 1 to the section power set value (750 MW); when an HF double circuit line has an N-1 fault, controlling the power of the section 1 to be 750MW can ensure that the HF double circuit line meets N-1 checking; when the N-1 fault occurs on the section 1 to cause the overload of the non-fault line, the system-level control strategy can automatically generate a new UPFC instruction value, and the requirement of section flow control can be met as far as possible on the premise of preferentially ensuring the non-fault line not to be overloaded.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the invention. It will be readily apparent to those skilled in the art that various modifications to the above-described embodiments may be made, and the generic principles defined herein may be applied to other embodiments without the use of inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (9)
1. A UPFC system-level control method with line power over-limit control function is characterized in that: the UPFC system-level control method is realized by combining a section power flow control strategy and a line power out-of-limit control module; the UPFC section power flow control function is realized through a section power flow control strategy, and under the normal operation state of a power grid, the actual power of a controlled section is quickly controlled below a reasonable power set value according to a scheduling instruction, so that the power transmission line connected with the controlled section in parallel is ensured to meet N-1 checking; when the power of the transmission line on the controlled section or the transmission line connected with the controlled section in series exceeds the limit due to the fault or the change of the working condition, a power deviation dP2 which is generated by the line power out-of-limit control module and can reflect the line out-of-limit condition is superposed, so that a UPFC control instruction which meets the requirement of safe and stable operation of a power grid is automatically generated, and the requirement of the section flow control is met on the premise of preferentially ensuring that the line is not overloaded.
2. The UPFC system-level control method of claim 1, wherein: the specific process of the section flow control strategy is as follows:
1.1, calculating a power deviation dP1 between the set power and the actual power of the controlled section;
1.2, superposing the power of a UPFC installation line, the power deviation dP1 and the power deviation dP2, and obtaining an active power instruction value of the UPFC through an amplitude limiting link;
1.3 calculating a reactive power instruction value of the UPFC by utilizing the active power instruction value according to a set line power factor;
and 1.4, controlling the UPFC through a related control algorithm according to the active power instruction value and the reactive power instruction value of the UPFC.
3. The UPFC system-level control method of claim 2, wherein: the set power of the controlled section in step 1.1 can ensure that the power transmission lines connected in parallel with the controlled section meet N-1 checking, that is, when the controlled section operates at the set power, any power transmission line connected in parallel with the controlled section has an N-1 fault, and then the power of other non-faulty parallel power transmission lines does not exceed respective power limit values.
4. The UPFC system-level control method of claim 2, wherein: in step 1.3, the reactive power instruction value of the UPFC is calculated by the following formula:
5. the UPFC system-level control method of claim 2, wherein: the specific process of the line power out-of-limit control module generating the power deviation dP2 is as follows:
2.1 monitoring the actual power of the power transmission line on the controlled section or the power transmission line connected with the controlled section in series, calculating the power deviation between the power limit value and the actual power of each monitored line, correspondingly taking the power deviation as the power margin of each monitored line for safe operation, and extracting the minimum value X of the power margin of all monitored lines for safe operation;
2.2 determining a selection signal Ctrl through logic judgment according to the power deviation dP1 and the power margin minimum value X;
2.3 determining the input of the PI controller according to the selection signal Ctrl, and generating the power deviation dP2 by using the output of the PI controller.
6. The UPFC system-level control method of claim 5, wherein: the specific logic judgment criteria in step 2.2 are as follows:
firstly, when the system is in a normal operation state, the actual power of each monitored line is lower than a power limit value, the minimum value X of the power margin is greater than 0, and the selection signal Ctrl is 0;
when the system has an N-1 fault or the monitored line is overloaded due to the change of working conditions, namely the actual power of the monitored line is higher than the power limit value, the minimum value X of the power margin is smaller than 0, and the selection signal Ctrl is 1;
and thirdly, when the actual power of the controlled section exceeds the set power and the actual power of each monitored line is lower than the power limit value, the power deviation dP1 is smaller than 0 and the power margin minimum value X is larger than 0, and the selection signal Ctrl is equal to 0 at the moment.
7. The UPFC system-level control method of claim 5, wherein: when the selection signal Ctrl is 0 in step 2.3, the input signal of the PI controller is 0; when selecting the signalWhen Ctrl equals 1, the input signal of PI controller is power control margin P preset by the line power out-of-limit control module and power margin minimum value XmThe difference of (a).
8. The UPFC system-level control method of claim 6, wherein: when the actual power of the controlled section exceeds the set power and the actual power of each monitored line is lower than the power limit value, the selection signal Ctrl is 0, the input signal of the PI controller is changed into 0 again, and meanwhile the integrator in the PI controller is cleared.
9. The UPFC system-level control method of claim 6, wherein: in the second and third cases, the triggering of the selection signal Ctrl has a certain delay, that is, the selection signal Ctrl at a plurality of consecutive times is 0 or 1, and the selection signal Ctrl is actually performing corresponding selection triggering on the input of the PI controller.
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| CN111276991A (en) * | 2020-01-15 | 2020-06-12 | 南京南瑞继保电气有限公司 | Power transfer device between circuit suitable for multiunit multi-circuit line |
| CN111884228A (en) * | 2020-07-31 | 2020-11-03 | 广东电网有限责任公司 | UPFC control strategy considering regional renewable energy consumption |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005756A (en) * | 2010-11-29 | 2011-04-06 | 许继集团有限公司 | Coordination control method for power of dual-loop direct-current transmission systems |
| CN104134968A (en) * | 2014-08-05 | 2014-11-05 | 南京南瑞继保电气有限公司 | Protection method and system for unified power flow controller |
-
2015
- 2015-12-17 CN CN201510954745.6A patent/CN105552916B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005756A (en) * | 2010-11-29 | 2011-04-06 | 许继集团有限公司 | Coordination control method for power of dual-loop direct-current transmission systems |
| CN104134968A (en) * | 2014-08-05 | 2014-11-05 | 南京南瑞继保电气有限公司 | Protection method and system for unified power flow controller |
Non-Patent Citations (3)
| Title |
|---|
| 蔡晖等: "含统一潮流控制器的系统控制策略研究", 《江苏电机工程》 * |
| 蔡晖等: "统一潮流控制器在南京西环网的应用", 《电力建设》 * |
| 郑华等: "统一潮流控制器潮流模型及功率调节能力分析", 《现代电力》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106026101A (en) * | 2016-06-29 | 2016-10-12 | 许继集团有限公司 | Double-circuit line unified power flow controller and multi-section power flow control method |
| CN106026102A (en) * | 2016-06-29 | 2016-10-12 | 许继集团有限公司 | Double-circuit line unified power flow controller and section power flow control method |
| CN106026101B (en) * | 2016-06-29 | 2020-05-19 | 许继集团有限公司 | Double-circuit line unified power flow controller and multi-section power flow control method |
| CN106026102B (en) * | 2016-06-29 | 2020-05-26 | 许继集团有限公司 | Double-circuit line unified power flow controller and section power flow control method |
| CN106208083A (en) * | 2016-10-09 | 2016-12-07 | 国网河北省电力公司 | A kind of method and device obtaining THE UPFC configuration |
| CN106208083B (en) * | 2016-10-09 | 2018-09-07 | 国网河北省电力公司 | A kind of method and device obtaining THE UPFC configuration |
| CN106953320A (en) * | 2017-03-31 | 2017-07-14 | 国网江苏省电力公司 | A kind of transmission line of electricity overload controlling method based on UPFC |
| CN106953320B (en) * | 2017-03-31 | 2019-05-07 | 国网江苏省电力公司 | A kind of transmission line of electricity overload controlling method based on UPFC |
| CN108306300A (en) * | 2018-01-30 | 2018-07-20 | 中国电力科学研究院有限公司 | A kind of method and system for determining THE UPFC capacity on major network section |
| CN108306300B (en) * | 2018-01-30 | 2020-09-01 | 中国电力科学研究院有限公司 | Method and system for determining capacity of unified power flow controller on main network section |
| CN111276991A (en) * | 2020-01-15 | 2020-06-12 | 南京南瑞继保电气有限公司 | Power transfer device between circuit suitable for multiunit multi-circuit line |
| CN111884228A (en) * | 2020-07-31 | 2020-11-03 | 广东电网有限责任公司 | UPFC control strategy considering regional renewable energy consumption |
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