Multi-node synchronous on-site test method

Abstract

A multi-node synchronous on-site test method, the method comprising: using GPS time as time reference, and conducting synchronous on-site tests on the devices to be tested and systems distributed at different places at an appointed time; controlling the synchronous phase control simulation devices distributed at multiple nodes via a synchronous test control center; within a uniform time section, synchronously outputting secondary side AC simulation signals, and simulating various actual operating conditions, thus achieving the detection of the monitoring and control performances of various dynamic monitoring and control systems, and ensuring the normal functions of the systems. The method of the present invention is able to conduct multi-node dynamic simulation test with synchronized GPS time, and achieves the detection of large-area multi-node monitoring and control systems. The present invention is suitable for the test of a wide area measurement system (WAMS) function, the simulation test of a damping control function, the simulation test of transiently stable state analysis and control functions, the simulation test of voltage stabilization and control functions, the simulation test of an islanding control function, the simulation test of wide area protection system functions and the like.

Claims

1. A test method comprising: A multi-node synchronous simulation test method, with a GPS time as a time reference, conducting a synchronous simulation test for an equipment and a system under test and distributed in a plurality of different sites within an agreed time, controlling a plurality of synchronously phased simulators distributed in multiple nodes through a control center, synchronously outputting a plurality of secondary-side AC simulation signals in an unified time section, and simulating a plurality of actual operation conditions to realize a monitoring and control performance test of a plurality of dynamic monitoring and control systems, ensure normal function of the system under test, and improve a reliability level of the system under test; a procedure of said methods being as follows: (1) firstly selecting multiple test nodes to be subject to the synchronous simulation test; principles of selection including at least one node of a power supply side or multiple nodes of a power grid side connected to a power plant; the control center of the synchronous simulation test being allowed to be located within a scope of a certain center node, or in a master station available to monitor data: (2) establishing communication link; the plurality of synchronously phased simulators and the control center of the synchronous simulation test of various nodes being subject to a communication handshake; the communication handshake being initiated by the control center, a point-to-point connection between each of the plurality of synchronously phased simulators and the control center of tire synchronous simulation test being established in a wireless way; (3) carrying out a system time synchronization to ensure a time synchronization of the system under test; said system time synchronization including: a time synchronization of a GPS time device, a command communication, and a simulation test command; (4) determining a simulation test scheme and a simulation test content: the simulation test scheme and the simulation content including: a test starting time, a test ending time, an AC simulation signal value of various simulation test nodes in each time section, including a phase, a frequency and a amplitude: if the simulation test content being a dynamic performance test or a fault simulation test, a plurality of AC simulation signal parameter's including the scope of a plurality of variable parameters; the simulation test content mainly including: a steady accuracy test, a transient signal test, and a fault simulation test.

2. The multi-node synchronous simulation test method according to claim 1, wherein the said steady accuracy test including a measurement accuracy test and a system synchronization accuracy test; the measurement accuracy test content including a current, a voltage, a phase, a frequency and other measurement accuracy tests; the system synchronization accuracy test including a clock synchronous input signal accuracy test and a punctuality accuracy test.

3. The multi-node synchronous simulation test method according to claim 1, wherein the said transient signal test being used in a case of a stability disruption suffered by a simulation system, a voltage instability or a function test of a wide area protection system, a necessary test content including: an abrupt change of voltage and current, a gradual change and an abrupt change of frequency, and an abrupt change of phase angle.

4. The multi-node synchronous simulation test method according to claim 1, wherein the said fault simulation test being available to simulate a low frequency oscillation, a single/three-phase ground fault, a two-phase short circuit, a three-phase short circuit, a metallic transient fault and a single-phase permanent fault of the system under test, an event identification of fault occurrence and a correct processing capacity by a synchronous simulation test system, recording of transient data, and whether recorded data being available to reflect the fault condition correctly.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 schematically shows the present invention, multi-node synchronous simulation test method;

(2) FIG. 2 is a flow block diagram showing the present invention, multi-node synchronous simulation test method;

(3) FIG. No. in drawings: 1 refers to the provincial dispatching center; 2 refers to the power plant; 3 refers to transformer station A; 4 refers to transformer station B; 5 refers to transformer station C; 6 is the bus; 7 is the communication line; 8 is the electric power circuit.

SPECIFIC MODE FOR CARRYING OUT THE INVENTION

(4) Description of the preferred embodiment of the present invention is shown in FIGS. 1 and 2.

(5) (1) Firstly Select Test Nodes to be Subject to Synchronous Simulation Test

(6) In the present embodiment, an important node of power supply side, power plant 2, and three nodes of power grid side connected to power plant: transformer station A3, B4 and C5 are selected. The control center of synchronous test is located in the center node, transformer station A.

(7) Work permit must be applied for from the provincial dispatching center 1 before carrying out site test after selecting test nodes to prevent occurrence of incorrect operation caused by simulation test. The rule of electric work tickets must be followed in case of working in electric field, and test personnel must be very familiar with actual wiring condition of devices on site before carrying out multi-node synchronous simulation test, otherwise occurrence of security incidents is easy to be caused. Since multi-node synchronous simulation test is carried out in different ends of stations, at least 3 groups of staff shall be arranged to two different nodes to carry out synchronous simulation test. In addition, before carrying out synchronous simulation test, coordination must be made with dispatching center of the grid company, and test data shall be obtained from back-end database of systems.

(8) (2) Wiring

(9) Connect voltage circuit and current circuit of synchronously phased simulators with those of devices under test, follow requirements of field operation instruction strictly during wiring, and strictly prohibit short circuit of voltage circuit or open circuit of current circuit.

(10) Master station of the provincial dispatching center 1 is connected to the bus 6 through data concentrator. Communication lines of synchronously phased simulators and devices under test are connected to the bus 6.

(11) (3) Test

(12) 1) Test devices of various nodes and the control center of synchronous test are subject to communication handshake through CDMA.

(13) 2) Test devices of various nodes, the control center of synchronous test and systems under test are subject to standard time synchronization.

(14) 3) The control center issues simulation test scheme based on test purpose.

(15) 4) Various nodes confirm the simulation test scheme and content, and the control center issues test starting command after receiving acceptance response from all nodes.

(16) 5) Various nodes conducts test item by item for test content within specified time according to requirements of the simulation test scheme, and implement simulation test content of the present node automatically. During test, test personnel must monitor the test site to prevent man-made or environmental interference upon test.

(17) 6) Compare test date of various nodes and test results of systems under test to calculate the measurement results.

(18) 7) Test devices of various nodes disconnect communication link with the synchronously phased simulation control center after it issues test ending command.