CN106771770B - Movable mould test system for wide area protection test - Google Patents
Movable mould test system for wide area protection test Download PDFInfo
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- CN106771770B CN106771770B CN201710013212.7A CN201710013212A CN106771770B CN 106771770 B CN106771770 B CN 106771770B CN 201710013212 A CN201710013212 A CN 201710013212A CN 106771770 B CN106771770 B CN 106771770B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
A movable mould test system for wide area protection test comprises a movable mould wide area protection measurement control cabinet and a movable mould wide area protection communication simulation cabinet. The movable mould wide-area protection measurement control cabinet comprises 1 centralized decision center CU and 5 distributed measurement control units MU; the movable mould wide area protection measurement control cabinet is provided with wiring terminals of the 6 modules. The movable mould wide area protection communication simulation cabinet comprises a communication manager, a direct-current power inverter, a monitoring system switch, a synchronous GPS module and 6 measurement control device communication switches SW. And the centralized decision center CU and each distributed measurement control unit MU are provided with a measurement control device IED. The centralized decision center CU and the 5 distributed measurement control units MU are connected with the optical fiber double-ring network SDH through 6 measurement control device communication switches SW. The system can be connected with a movable mould experimental platform of a power system to accurately test various principles, communication modes, time delay, control strategies and the like of wide area protection.
Description
Technical Field
The invention relates to a relay protection movable mould test system of a power system, in particular to a movable mould test system for a wide area protection test.
Background
With the development of social economy, requirements on power supply are increasingly high in terms of power supply reliability and power quality. Relay protection is an important defense line for ensuring safe and stable operation of a power grid, and the reliability and the rapidity of the relay protection are important to isolating faults and preventing accidents from being enlarged (Yin Xianggen, li Zhenxing, liu Yingtong, liu Bao. Discussion of wide-area relay protection and fault element distinguishing problems thereof. Protection and control of a power system, 2012, 40 (5): 1-8.). The traditional relay protection adopts an off-line mode to set a fixed value, but cannot be adjusted according to the change of an operation mode. In addition, when the tide of the system is transferred, the backup protection can cause the interlocking tripping accident by misoperation.
With the development of wide-area measurement technology in recent years, wide-area protection based on multi-information of a power grid is enabled to be practically applied to the power grid. The core idea of wide area relay protection is to identify fault elements by multi-information fusion calculation and ensure reliable fault removal by simple logic cooperation by using wide area synchronous measurement information in a power grid (Li Zhenxing, yin Xianggen, zhang Zhe, deng Xing, wang Yoxue. System structure and fault identification of regional wide area relay protection [ J ]. Chinese motor engineering journal, 2011, 28:95-103.). However, the wide area protection still has some research difficulties in the aspects of on-line self-adaptive setting, tide transfer identification, fault element identification and the like (He Zhiqin, zhang Zhe, yin Xianggen, chen Wei. Electric power system wide area relay protection research overview [ J ]. Electric power automation equipment, 2010, 05:125-130.) meanwhile, the wide area protection structure and protection principle are numerous, the protection scope is large, and once insufficient reliability occurs, the safety and stability of the power grid are extremely risky (Li Zhenxing, wu Liqun, wang Xin, li Zhenhua. The wide area direction protection algorithm applying the complex impedance comparison principle [ J ]. Power grid technology, 2016, 03:938-943.). Therefore, the method has important practical significance for promoting engineering application of wide area protection and establishing a movable mould test platform for verifying wide area protection performance.
Disclosure of Invention
The invention provides a relay protection movable mould test system of a power system, which comprises a movable mould wide area protection measurement control cabinet and a movable mould wide area protection communication simulation cabinet, wherein the relay protection movable mould test system is simple in structure, can be connected with a movable mould test platform of the power system, and can accurately test various principles, communication modes, time delay, control strategies and the like of wide area protection; the dynamic simulation real platform capable of accurately simulating the time delay is provided for the research of wide area protection.
The technical scheme adopted by the invention is as follows:
a movable mould test system for wide area protection test comprises a movable mould wide area protection measurement control cabinet and a movable mould wide area protection communication simulation cabinet. The movable mould wide-area protection measurement control cabinet comprises 1 centralized decision center CU and 5 distributed measurement control units MU; the movable mould wide area protection measurement control cabinet is provided with wiring terminals of the 6 modules;
the movable mould wide area protection communication simulation cabinet comprises a communication manager, a direct-current power inverter, a monitoring system switch, a synchronous GPS module and 6 measurement control device communication switches SW;
the centralized decision center CU and each distributed measurement control unit MU are provided with a measurement control device IED;
the centralized decision center CU and the 5 distributed measurement control units MU are connected with the optical fiber double-ring network SDH through 6 measurement control device communication switches SW.
The measurement control device IED is configured to measure 3-cycle electrical signals, wherein each cycle electrical signal comprises a three-phase current/voltage signal and a zero-sequence current/voltage signal.
The measurement control device IED is used for measuring 2 paths of switch state signals; or the switching device is used for outputting 2 paths of switching-on/off switching-off signals.
The IED of the measurement control device is connected with the synchronous GPS module, and the IED of the measurement control device provides synchronous signals by the synchronous GPS module and supports SV, GOOSE, MMS three message communication formats.
The communication manager is used for the communication of 1 centralized decision center CU and 5 distributed measurement control units MU on the optical fiber double-ring network SDH.
And the direct-current power supply inverter is used for providing direct-current power supply for the movable mould wide-area protection communication simulation cabinet.
The monitoring system switch is used for monitoring the SCADA system and is connected with the wide area protection system.
The measurement control device communication switch SW is used for communication between the measurement control device IED and the optical fiber double-ring SDH ring network. The system is connected with a power system movable mould experiment platform.
The movable mould test system for the wide area protection test has the following beneficial effects:
(1) The system consists of a movable die wide area protection measurement control cabinet and a movable die wide area protection communication simulation cabinet, and is simple in structure.
(2) The system can accurately simulate the time delay of each link of the wide area protection, the wide area protection test is closer to an engineering actual system, and the engineering application of the wide area protection can be accelerated.
(3) The movable mould wide area protection test system can be connected with a movable mould experiment platform to accurately test various principles, communication modes, time delay, control strategies and the like of wide area protection so as to realize movable mould simulation of wide area protection.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a communication schematic of the system of the present invention.
Fig. 3 is a schematic diagram of the IED function wiring of the measurement control device of the system of the present invention.
Fig. 4 is a schematic diagram of a movable mold wide area protection communication simulation cabinet of the system of the invention.
FIG. 5 is a schematic diagram of a wide area protection movable mold test system of the present invention.
Fig. 6 is a diagram illustrating an exemplary wide area protection test principle of the system of the present invention.
Detailed Description
A movable mould test system for wide area protection test is shown in figure 1, and comprises a movable mould wide area protection measurement control cabinet and a movable mould wide area protection communication simulation cabinet.
The movable mould wide-area protection measurement control cabinet comprises 1 centralized decision center CU and 5 distributed measurement control units MU; and wiring terminals of the 6 modules are arranged below the movable mould wide-area protection measurement control cabinet.
The movable mould wide area protection communication simulation cabinet comprises a communication manager, a direct-current power inverter, a monitoring system switch, a synchronous GPS module and 6 measurement control device communication switches SW.
And the centralized decision center CU and each distributed measurement control unit MU are provided with a measurement control device IED. The communication connection relation of the movable mode test system of the wide area protection test is shown in fig. 2, wherein the centralized decision center CU and the distributed measurement control unit MU are connected with the optical fiber double-ring network SDH through 6 communication switches SW. And the communication manager controls the communication switch SW to realize the access of the optical fiber double-ring network SDH mode. Here, a single-ring communication mode may be selected, or a double-ring communication mode may be selected; in each communication mode, centralized communication or distributed communication can be selected, wherein the centralized communication is that 5 MU devices only communicate with the CU devices through a communication network, and the MUs centralize all information to realize protection decision and control, so that the MUs do not communicate with each other; the distributed communication, namely the 6 IEDs can communicate with each other, and all the information is acquired from each other to realize protection judgment and decision. And finally, providing a synchronous signal for each IED device by a synchronous GPS module.
The communication manager is used for monitoring and managing the communication of 1 centralized decision center CU and 5 distributed measurement control units MU on the optical fiber double-ring network SDH. The communication manager may use a Nanj Pan Enable technology DMP2218 device.
And the direct-current power supply inverter is used for providing direct-current power supply for the movable mould wide-area protection communication simulation cabinet. The DC power inverter can adopt a Hangzhou birthday science and technology 230D10ZZ-220AC device.
The monitoring system exchanger is used for monitoring the SCADA system (adopting Nanj Pan energy science and technology SE-1800 system) and is connected with the movable mould wide area protection system.
The measurement control device communication switch SW is used for communication between the measurement control device IED and the optical fiber double-ring SDH ring network. The measurement control device communication switch SW may employ a witNet IES3009 device.
The measurement control device IED is shown in fig. 3. For measuring 3 return electrical signals, wherein each return electrical signal comprises a three-phase current/voltage signal and a zero-sequence current/voltage signal. The measurement control device IED can adopt a Nanj pan energy technology MMP5505 device.
The measurement control device IED is used for measuring 2 paths of switch state signals and can support 2 paths of opening and closing switch quantity input.
The measurement control device IED is used for outputting 2 paths of opening/closing opening signals and can support 2 paths of opening/closing switching value output.
The IED of the measurement control device is connected with the synchronous GPS module, and the IED of the measurement control device provides synchronous signals by the synchronous GPS module and supports SV, GOOSE, MMS three message communication formats. The synchronous GPS module can adopt a Nanjing pan energy technology DMP5296 device.
The wiring of the panel of the movable mould wide area protection measurement control cabinet is illustrated in fig. 4, wherein:
1 is all wiring terminals of a certain distributed measurement control unit MU or a centralized decision center CU, and comprises 6 modules in total;
2 is the wiring terminal of 1-path current measurement of a certain module, and the total number of the wiring terminals is 3;
3. 4, 5 and 6 are A, B, C three-phase loops and zero-sequence loops in one path of electrical measurement respectively;
7 is a 1-path closing opening signal;
8 is 1 path of opening signal;
9 is a 1-path closing opening signal;
an example of a wide area protection movable mold test system wiring is shown in fig. 5, wherein:
the measurement control device IED1 simulates a B1 transformer substation measurement control system to respectively measure the voltage of a bus PT1, the current of a connected incoming line CT1 and the current of a CT2, and simultaneously controls the circuit breakers S1 and S2.
The measurement control device IED2 and the measurement control device IED3 simulate a B2 transformer substation measurement control system together, and the measurement control device IED2 respectively measures the voltage of a bus PT2 and the current of a connecting incoming line CT3 and controls a circuit breaker S3; the measurement control device IED3 respectively measures the voltage of the bus PT2, the current of the connected incoming and outgoing lines CT4 and CT5, and simultaneously controls the circuit breakers S4 and S5.
The measurement control device IED4 simulates a B3 transformer substation measurement control system to respectively measure the voltage of a bus PT3, the current of a connected incoming line CT6 and the current of a CT8, and simultaneously controls the circuit breakers S6 and S8.
The measurement control device IED5 simulates a B4 transformer substation measurement control system to respectively measure the voltage of a bus PT4, the current of a connected incoming line CT7 and the current of a CT9, and simultaneously controls the circuit breakers S7 and S9.
The centralized decision center CU simulates a wide area protection decision system, which is shown in fig. 2 with the wiring of the measurement control devices IED 1-5.
For the above wiring mode, the wide area protection principle and its protection area are tested, as shown in fig. 6. When the invention works, the invention can work by connecting wires as shown in figures 1 to 5. Taking verification of wide area current differential protection as an example, when a fault occurs in the system L1, the centralized decision center CU starts three-wheeled differential protection of the measurement control device IED 1:
step 1: first round protection based on measuring current at both ends of current CT2, CT3
The protection range is shown in the area I of FIG. 6. Calculating differential current and braking current (taking one phase as an example, the actual system works as three-phase current differential and zero sequence current differential, and calculating and protecting and judging respectively)
Differential current
Braking current
The protection criterion adopts a three-section type current differential protection principle, wherein k is as follows 1 ＝0.3，k 2 ＝0.65，I r1 ＝0.6I N ，I r2 ＝3.0I N
The first round differential protection if active, the centralized decision center CU will send out the jump S2 breaker switch to the measurement control device IED1 and the jump S3 breaker switch to the measurement control device IED 2. Further, after the protection action is delayed for 100ms, the fault current of the CT1 can still be monitored, and then a jump S1 breaker switch is sent to the measurement control device IED 1; similarly, after the protection action is delayed for 100ms, the fault current of the CT2 can be monitored, and then the jump S4 and S5 breaker switches are sent to the measurement control device IED3, and an alarm signal is sent. If the protection is not active, the second wheel differential protection will be activated.
Step 2: second round protection based on three terminal currents of measured currents CT2, CT4, CT5
The protection range is shown in the area II of FIG. 6. Differential current and brake current were calculated separately:
differential current
Braking current
The second wheel differential protection criterion still adopts the first wheel current differential protection principle. If so, the centralized decision center CU will issue a trip S2 breaker switch to the measurement control device IED1 and trip S4, S5 breaker switches to the measurement control device IED 3. Further, after the protection action is delayed for 100ms, the fault current of the CT1 can still be monitored, and then a jump S1 breaker switch is sent to the measurement control device IED 1; similarly, after the protection action is delayed for 100ms, the fault current of the CT4 or the CT5 can be monitored, and then the jump S3 breaker switch is sent to the measurement control device IED2, and an alarm signal is sent. If the protection is still inactive, the second wheel differential protection will be activated.
Step 3: third round of protection based on three-terminal current of measured currents CT2, CT4, CT5
The protection range is shown in area III of fig. 6. Respectively calculating differential current and systemKinetic current:
differential current
Braking current
The third wheel differential protection criterion still adopts the first wheel current differential protection principle. If so, the centralized decision center CU will send out a trip S2 breaker switch to the measurement control device IED1, a trip S6 breaker switch to the measurement control device IED4, and a trip S7 breaker switch to the measurement control device IED 5. Further, after the protection action is delayed for 100ms, the fault current of the CT1 can still be monitored, and then a jump S1 breaker switch is sent to the measurement control device IED 1; similarly, after the protection action is delayed for 100ms, the fault current of the CT6 can be monitored, and a jump S8 breaker switch is sent to the measurement control device IED 4; after the protection action is delayed for 100ms, the fault current of the CT7 can be monitored, and a jump S9 breaker switch is sent to the measurement control device IED5; and issues an alarm signal. If the protection is still inactive, the wide area differential protection returns.
The movable mould wide area protection test system has a simple structure, and can accurately test various principles of wide area protection, corresponding communication modes, time delay, control strategies and the like through connecting a movable mould experimental platform of a power system.
Claims (1)
1. A test method for verifying wide-area current differential protection is characterized by comprising a wide-area protection movable mould test system, wherein the wide-area protection movable mould test system comprises the following components: 1 centralized decision center CU,5 measurement control devices IED 1-5;
the centralized decision center CU simulates a wide area protection decision system;
the centralized decision center CU, the measurement control device IED 1-the measurement control device IED5 are connected with the optical fiber double-ring network SDH through 6 measurement control device communication switches SW;
wherein:
the measurement control device IED1 simulates a B1 transformer substation measurement control system to respectively measure the voltage of a bus PT1, the current of a connected incoming line CT1 and the current of a CT2, and simultaneously controls the circuit breakers S1 and S2;
the measurement control device IED2 and the measurement control device IED3 simulate a B2 transformer substation measurement control system together, and the measurement control device IED2 respectively measures the voltage of a bus PT2 and the current of a connecting incoming line CT3 and controls a circuit breaker S3; the measurement control device IED3 respectively measures the voltage of the bus PT2, the current of the connected incoming and outgoing lines CT4 and CT5, and simultaneously controls the circuit breakers S4 and S5;
the measurement control device IED4 simulates a B3 transformer substation measurement control system to respectively measure the voltage of a bus PT3, the current of a connected incoming line CT6 and the current of a CT8, and simultaneously controls the circuit breakers S6 and S8;
the measurement control device IED5 simulates a B4 transformer substation measurement control system to respectively measure the voltage of a bus PT4, the current of a connected incoming line CT7 and the current of a CT9, and simultaneously controls the circuit breakers S7 and S9;
the test method comprises the following steps:
step 1: first round protection based on measuring current at both ends of current CT2, CT3
Calculating differential current and braking current;
differential current
Braking current
The protection criterion adopts a three-section type current differential protection principle, wherein k is as follows 1 ＝0.3，k 2 ＝0.65，I r1 ＝0.6I N ，I r2 ＝3.0I N
If the first round differential protection acts, the centralized decision center CU sends out a jump S2 breaker switch to the measurement control device IED1, sends out a jump S3 breaker switch to the measurement control device IED2, can monitor that the CT1 has fault current after the protection acts for 100ms of time delay, and sends out a jump S1 breaker switch to the measurement control device IED 1; similarly, after the protection action is delayed for 100ms, the fault current of the CT2 can be monitored, and then the jump S4 and S5 breaker switches are sent to the measurement control device IED3 and an alarm signal is sent; if the protection is not operated, the second wheel differential protection is started;
step 2: second round protection based on three terminal currents of measured currents CT2, CT4, CT5
Differential current and brake current were calculated separately:
differential current
Braking current
The second wheel differential protection criterion still adopts the first wheel current differential protection principle, if the action is performed, the centralized decision center CU sends tripping S2 breaker switches to the measurement control device IED1, and sends tripping S4 and S5 breaker switches to the measurement control device IED3, and after the protection action is delayed for 100ms, the fault current of CT1 can still be monitored, and then the tripping S1 breaker switch is sent to the measurement control device IED 1; similarly, after the protection action is delayed for 100ms, the fault current of the CT4 or the CT5 can be monitored, and then the jump S3 breaker switch is sent to the measurement control device IED2 and an alarm signal is sent; if the protection is still inactive, the second wheel differential protection will be started;
step 3: third round protection based on measuring three terminals of currents CT2, CT4, CT5Electric current
Differential current and brake current were calculated separately:
differential current
Braking current
The third wheel differential protection criterion still adopts the first wheel current differential protection principle, if the action is performed, the centralized decision center CU sends a tripping S2 breaker switch to the measurement control device IED1, sends a tripping S6 breaker switch to the measurement control device IED4, sends a tripping S7 breaker switch to the measurement control device IED5, and can still monitor that the CT1 has fault current after the protection action is delayed for 100ms, and sends a tripping S1 breaker switch to the measurement control device IED 1; similarly, after the protection action is delayed for 100ms, the fault current of the CT6 can be monitored, and a jump S8 breaker switch is sent to the measurement control device IED 4; after the protection action is delayed for 100ms, the fault current of the CT7 can be monitored, and a jump S9 breaker switch is sent to the measurement control device IED5; and sending out an alarm signal; if the protection is still inactive, the wide area differential protection returns.
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| CN108347041B (en) * | 2018-05-04 | 2024-02-09 | 国家电网公司 | Building block type on-site busbar protection device for container |
| CN109991516B (en) * | 2019-04-12 | 2021-07-20 | 国网江苏省电力有限公司宿迁供电分公司 | Power distribution network dynamic simulation system expansion interface screen and application method thereof |
| CN114825646A (en) * | 2022-06-29 | 2022-07-29 | 四川明星电力股份有限公司 | Remote monitoring system and method for protection current of transformer substation |
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