Closed-loop test method and system for stability control system

Abstract

The invention discloses a closed-loop test method and system for a stability control system, and the method comprises the steps: transmitting a small amount of channel configuration information of a test master station to a test terminal through a communication network, generating and outputting a large amount of channel instantaneous values to a stability control device after the test terminal receives the channel configuration information, and collecting an action result of the stability control device through the test terminal. Judging the action correctness of the stability control system according to the action result, and generating a test report; according to the invention, the requirement of the test system for the bandwidth of the wide area communication network is reduced, the consumption of the flow of the wide area communication network and the influence of the delay jitter of the wide area communication network on the synchronization test are reduced, and meanwhile, the test system and the stability control system form a closed-loop system; the problem that an on-site stability control system is difficult to synchronously test and automatically check an action result is effectively solved.

Description

Technical Field

[0001] The present invention relates to a closed-loop test method and system, and particularly to a closed-loop test method and system for a stability control system. Background Art

[0002] The reliability and stability of the stability control system are crucial for the operation of the power system. The stability control system test involves a large number of substations, complex interworking logics, and non-fixed intervals involved in the test. The above characteristics make the test process time-consuming, laborious, and resource-consuming. It is difficult for the existing human resources configuration to complete the complete and comprehensive on-site test requirements for all control strategies of the stability control system. Therefore, the development of a remote stability control test system is necessary.

[0003] The existing remote stability control test system of the stability control system usually adopts a three-layer architecture of a test master station, a communication network, and test terminals. The test master station centrally manages all test terminals. The test master station obtains power grid simulation data by playing back the calculation results of offline simulation tools such as BPA and PSASP or real-time converting the output waveforms of online simulation tools such as RTDS, and sends the power grid simulation data to the test terminals of different substations through the communication network to achieve synchronous simulation testing of the stability control system.

[0004] Although the existing remote stability control test system can achieve synchronous simulation testing, it faces problems such as high construction costs, network bandwidth limitations, and fluctuations in traffic and delay, and it is difficult to meet the requirements of comprehensive testing of the stability control system. In addition, the transmission of power grid simulation data in the existing remote stability control test system is often interrupted, resulting in inaccurate test results and it is difficult to effectively improve the test efficiency of the stability control system. Summary of the Invention

[0005] Object of the Invention: The object of the present invention is to provide a closed-loop test method for a stability control system to reduce the requirements of the test system for the bandwidth of the wide-area communication network, reduce the consumption of the wide-area communication network traffic and the impact of wide-area communication network delay jitter on synchronous testing, and reduce costs. On the other hand, a closed-loop test system for a stability control system is provided.

[0006] Technical Solution: The closed-loop test method for a stability control system according to the present invention includes the following steps:

[0007] (1) The test master station sends channel configuration information to the test terminal through the communication network, and the channel configuration information includes a fault type and fault characteristic parameters;

[0008] (2) The test terminal judges the integrity of the information according to the received channel configuration information and sends the judgment result to the test master station;

[0009] (3) The test master station makes a function judgment based on the received judgment result. If the channel configuration information is complete, it sends a start instruction containing the synchronous start time to the test terminal; otherwise, it returns to step 1.

[0010] (4) The test terminal makes a judgment on the rationality of the received start instruction and sends the judgment result to the test master station.

[0011] (5) The test master station makes a function judgment based on the received judgment result of the instruction rationality. If the start instruction is unreasonable, it sends a cancel start instruction to the test terminal and returns to step 3.

[0012] (6) When the test terminal reaches the synchronous start time, according to the received channel configuration information, it selects the corresponding channel sampling instantaneous value formula to calculate and generate the channel sampling instantaneous value, selects the corresponding channel output instantaneous value formula to calculate and generate the channel output instantaneous value, and outputs them to the stability control device.

[0013] (7) The test terminal collects the action results of the stability control device and sends the action results to the test master station after the state sequence ends.

[0014] (8) The test master station makes a judgment on the correctness of the action result of the stability control system based on the received action result, generates a test report, and forms a closed-loop test.

[0015] Preferably, the fault types described in step 1 include single-phase transient fault of phase A, single-phase transient fault of phase B, single-phase transient fault of phase C, single-phase permanent fault of phase A, single-phase permanent fault of phase B, single-phase permanent fault of phase C, inter-phase fault between AB, inter-phase fault between BC, inter-phase fault between AC, three-phase short circuit, no-fault tripping, low-frequency fault, over-frequency fault, low-voltage fault, over-voltage fault, light-load fault, overload fault.

[0016] Preferably, the fault characteristic parameters described in step 1 include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage-current phase angle difference, fault voltage amplitude, fault current amplitude, steady-state duration before fault, tripping waiting delay, reclosing waiting delay, tripping waiting delay for reclosing failure, duration after fault, protection trip pulse width time, frequency change rate, termination frequency, voltage amplitude change rate, termination voltage amplitude, current amplitude change rate, termination current amplitude.

[0017] Preferably, the channel sampling instantaneous value formula described in step 6 is as follows:

[0018]

[0019] Where y represents the channel sampling instantaneous value, t represents time, A(t, A 1 , A 2 , …, A i ) represents a formula containing constants A 1 , A2 ,..., A i The amplitude expression, f(t, f 1 , f i ,..., f m ), represents a frequency expression containing constants f 1 , f i ,..., f m ; represents a phase angle expression containing a constant ;

[0020] The fault characteristic parameters include constants A 1 , A 2 ,..., A i , f 1 , f i ,..., f m , The fault type corresponds to the channel sampling instantaneous value calculation formula composed of the amplitude expression, frequency expression, and phase angle expression.

[0021] Preferably, the amplitude expression is:

[0022] A(t, A 0 , K A , T) = A 0 + K A t, 0 ≤ t < T;

[0023] where, A 0 represents the starting amplitude, K A represents the amplitude change rate, and T represents the time satisfying the current channel sampling instantaneous value calculation formula;

[0024] The frequency expression is: f(t, f 0 , K f , T) = f 0 + K f t, 0 ≤ t < T;

[0025] where, f0 represents the starting frequency, K f represents the frequency change rate;

[0026] The phase angle expression is:

[0027] where, represents the starting phase angle, represents the phase angle change rate.

[0028] Preferably, the channel output instantaneous value formula in step 6 is as follows:

[0029] z = Z(z 0 , t 1 , t2 , …, t p );

[0030] Among them, z represents the instantaneous value of the channel output, and Z(z 0 , t 1 , t 2 , …, t p ) represents the expression of the instantaneous value of the channel output containing the constant z 0 , t 1 , t 2 , …, t p , and z 0 represents the starting value of the channel output, and t p represents the p-th change moment of the instantaneous value of the channel output;

[0031] The expression of the instantaneous value of the channel output Z(z 0 , t 1 , t 2 , …, t p ) constitutes the type of the fault switch quantity signal; the constant z 0 , t 1 , t 2 , …, t p corresponds to the characteristic parameters of the fault switch quantity signal, and the fault type corresponds to the expression of the instantaneous value of the channel output Z(z 0 , t 1 , t 2 , …, t p ), and the fault characteristic parameters include the constant z 0 , t 1 , t 2 , …, t p .

[0032] Preferably, during the closed-loop test process in step 8, the test master station continuously receives the heartbeat messages sent by the test terminal. If the heartbeat messages are not received within the timeout period, an alarm is issued to prompt the inspection of the communication network and the test terminal.

[0033] A closed-loop test system for a stability control system according to the present invention includes:

[0034] A test master station, which is used to set multiple fault types and corresponding fault characteristic parameters, form multiple state sequences containing the fault types and corresponding fault characteristic parameters, and send the state sequences to the test terminal, judge the correctness of the stability control system action according to the action results of the stability control device returned by the test terminal, and automatically generate a test report. The test master station includes management software running on the upper computer;

[0035] A test terminal, which is used to generate channel sampling instantaneous values and channel output instantaneous values according to the received channel configuration information, output them to a stability control device, and send the action result data of the stability control device to a test master station;

[0036] A communication network, which is used to place the test master station and the test terminal within the same virtual local area network, and uses the Internet of Things card of a telecommunications operator. The communication network includes Ethernet, optical fiber, communication cable, 4G, 5G, and Wi-Fi.

[0037] Preferably, the test terminal internally includes:

[0038] A management plugin, which is used to uniformly manage the plugins and data streams inside the test terminal;

[0039] A communication plugin, which is used to communicate between the test master station and the test terminal;

[0040] An analog quantity output plugin, which is used to generate electrical quantity data;

[0041] A digital quantity output plugin, which is used to generate digital quantity data;

[0042] A digital quantity input plugin, which is used to collect the signal of the action outlet node of the stability control device;

[0043] The plugins communicate with each other using an internal Ethernet or a CAN network.

[0044] Preferably, the communication protocol between the test master station and the test terminal adopts the TCP / IP protocol.

[0045] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages: 1. The test master station sends a small amount of information such as fault types and fault characteristic parameters to the test terminal, and the test terminal generates and outputs a large number of channel instantaneous values, which can reduce the requirements for the bandwidth of the wide-area communication network of the test system, reduce the consumption of the wide-area communication network traffic, and reduce the impact of the wide-area communication network delay jitter on synchronous testing; 2. The test system and the stability control system form a closed-loop system, which can solve the problems that it is difficult to synchronously test the on-site stability control system and it is difficult to automatically verify the action results. Description of the Drawings

[0046] Figure 1 It is a schematic diagram of the principle of the closed-loop test method of the present invention;

[0047] Figure 2 It is a schematic diagram of the flow of the closed-loop test method of the present invention. Detailed Embodiments

[0048] Next, in combination with the drawings, the technical solutions of the present invention will be described in detail.

[0049] (1) The test master station sends the corresponding channel configuration information to multiple test terminals using a status sequence.

[0050] The test master station runs on the upper computer, which can be an ordinary industrial control computer or a laptop. The upper computer accesses a wireless router equipped with a fixed IP IoT card through Ethernet and connects and communicates with the communication plugin inside the test terminal through the wireless public network. The communication protocol uses the TCP / IP protocol.

[0051] The communication plugin is also equipped with a wireless router with a fixed IP IoT card.

[0052] The test master station supports the connection of 16 test terminals. Each test terminal can support 72 analog outputs and 96 digital outputs. The test master station can set the fault type and fault characteristic parameters to form multiple status sequences. The test master station sends the corresponding channel configuration information to multiple test terminals using a status sequence.

[0053] The measured stability control device can collect 6 lines, sample 36 analog channels, and collect 18 digital channels. If the test master station sets a status sequence, each channel of the status sequence contains fault type and fault characteristic parameter data. The fault characteristic parameter data includes steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage and current phase angle difference, fault voltage amplitude, fault current amplitude, steady-state duration before fault, trip waiting delay, duration after fault, protection trip pulse width time, etc.

[0054] The test master station can realize the setting of all connected test terminals and their channels, including setting the fault type and the corresponding fault characteristic parameters. After the setting is completed, the test master station sends the settings of each channel to the test terminals using the TCP / IP protocol. The test master station can judge faults such as abnormal test terminal boards by obtaining, monitoring, and real-time analyzing communication messages. Heartbeat messages are sent regularly between the test master station and the test terminals to judge whether the communication is normal.

[0055] (2) The test terminal judges the information integrity according to the received channel configuration information and sends the judgment result to the test master station.

[0056] (3) The test master station makes a function judgment according to the received channel configuration information integrity judgment result. If the channel configuration information is complete, it sends a start instruction including the synchronous start time to all test terminals; otherwise, it returns to step 1.

[0057] (4) The test terminal makes a command rationality judgment according to the received start instruction and sends the judgment result to the test master station.

[0058] (5) The test master station makes a function judgment based on the rationality judgment result of the received start instruction. If the start instruction is unreasonable, it sends a cancellation start instruction to all test terminals and returns to step 3.

[0059] (6) When the test terminal reaches the synchronous start time, according to the received channel configuration information, it selects the corresponding channel sampling instantaneous value formula to calculate and generate the channel sampling instantaneous value, selects the corresponding channel output instantaneous value formula to calculate and generate the channel output instantaneous value, and outputs them to the stability control device.

[0060] Inside the test terminal, there are management plug-ins, communication plug-ins, analog quantity output plug-ins, digital quantity output plug-ins, and digital quantity input plug-ins. The internal plug-ins communicate with each other through the internal Ethernet or CAN network. Among them, the management plug-in is used to uniformly manage the plug-ins and data streams inside the test terminal. For example, it distributes the data sent by the test master station through the communication plug-in to the corresponding analog quantity output plug-in, digital quantity output plug-in, etc., and uniformly aggregates the stability control device action result data collected by the digital quantity input plug-in and other plug-ins and uploads them to the test master station through the communication plug-in; the communication plug-in is used for communication between the test master station and the test terminal; the digital quantity input plug-in is used to collect the stability control device action export node signals; the analog quantity output plug-in is used to generate electrical quantity data; the digital quantity output plug-in is used to generate digital quantity data.

[0061] The analog quantity output plug-in is developed using C language. Since the sine function operation amount in C language is relatively large, a look-up table method is used to calculate the sampling instantaneous value to save the calculation amount. The channel sampling instantaneous value is calculated according to the look-up table method. The specific process is as follows: In the sampling interrupt, the current time information is obtained, and according to the channel sampling instantaneous value calculation formula, the current sine angle is calculated, and then the corresponding trigonometric function value is queried in the pre-set trigonometric function table, and the channel sampling instantaneous value of the current sampling interrupt is calculated in combination with the amplitude.

[0062] The channel sampling instantaneous value formula is as follows:

[0063]

[0064] Among them, y represents the channel sampling instantaneous value, t represents time, A(t, A 1 , A 2 , …, A i ) represents the amplitude expression containing constants A 1 , A 2 , …, A i , f(t, f 1 , f i , …, f m ) represents the frequency expression containing constants f 1 , fi, …, f m . Represents containing constants of the phase angle expression; the fault type corresponds to a specific amplitude expression A(t, A 1 , A 2 , …, A i ), a specific frequency expression f(t, f 1 , f i , …, f m ), and a specific phase angle expression constituting the calculation formula for the instantaneous value of channel sampling; the fault characteristic parameters are specific constants A 1 , A 2 , ···, A i , f 1 , f i , …, f m ,

[0065] The amplitude expression is: A(t, A 0 , k A , T) = A 0 + K A T, 0 ≤ t < T;

[0066] Among them, A 0 represents the starting amplitude, k A represents the amplitude change rate, and T represents the time that satisfies the calculation formula for the instantaneous value of channel sampling;

[0067] The frequency expression is: f(t, f 0 , k f , T) = f 0 + k f t, 0 ≤ t < T;

[0068] Among them, f 0 represents the starting frequency, and k f represents the frequency change rate;

[0069] The phase angle expression is:

[0070] Among them, represents the starting phase angle, represents the phase angle change rate;

[0071] The calculation formula for the instantaneous value of channel sampling is:

[0072]

[0073] Among them, A 0 represents the starting amplitude, k A represents the amplitude change rate, f 0 represents the starting frequency, k f represents the frequency change rate, represents the starting phase angle, represents the rate of change of phase angle;

[0074] The fault characteristic parameter is a constant A 0 , k A , f 0 , k f , T;

[0075] The fault type corresponds to the instantaneous value calculation formula of the channel sampling composed of a specific set of fault characteristic parameters. The fault types include single instantaneous fault of phase A, single instantaneous fault of phase B, single instantaneous fault of phase C, single permanent fault of phase A, single permanent fault of phase B, single permanent fault of phase C, interphase fault between AB, interphase fault between BC, interphase fault between AC, three-phase short circuit, no-fault tripping, low-frequency fault, over-frequency fault, low-voltage fault, over-voltage fault, light-load fault, overload fault;

[0076] The fault characteristic parameters corresponding to single instantaneous fault of phase A, single instantaneous fault of phase B, and single instantaneous fault of phase C include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage-current phase angle difference, fault voltage amplitude, fault current amplitude, steady-state duration before fault, tripping waiting delay, reclosing waiting delay, duration after fault, protection trip pulse width time;

[0077] The fault characteristic parameters corresponding to single permanent fault of phase A, single permanent fault of phase B, and single permanent fault of phase C include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage-current phase angle difference, fault voltage amplitude, fault current amplitude, steady-state duration before fault, tripping waiting delay, reclosing waiting delay, reclosing failure tripping waiting delay, duration after fault, protection trip pulse width time;

[0078] The fault characteristic parameters corresponding to interphase fault between AB, interphase fault between BC, and interphase fault between AC include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage-current phase angle difference, fault voltage amplitude, fault current amplitude, steady-state duration before fault, tripping waiting delay, duration after fault, protection trip pulse width time;

[0079] The fault characteristic parameters corresponding to three-phase short circuit include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage-current phase angle difference, fault voltage amplitude, fault current amplitude, steady-state duration before fault, tripping waiting delay, duration after fault, protection trip pulse width time;

[0080] The fault characteristic parameters corresponding to no-fault tripping include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage-current phase angle difference, fault voltage amplitude, fault current amplitude, steady-state duration before fault, tripping waiting delay, duration after fault, protection trip pulse width time;

[0081] The fault characteristic parameters corresponding to low-frequency faults include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage-current phase angle difference, frequency change rate, termination frequency, pre-fault steady-state duration, and post-fault duration;

[0082] The fault characteristic parameters corresponding to over-frequency faults include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage-current phase angle difference, frequency change rate, termination frequency, pre-fault steady-state duration, and post-fault duration;

[0083] The fault characteristic parameters corresponding to low-voltage faults include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage-current phase angle difference, voltage amplitude change rate, termination voltage amplitude, pre-fault steady-state duration, and post-fault duration;

[0084] The fault characteristic parameters corresponding to over-voltage faults include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage-current phase angle difference, voltage amplitude change rate, termination voltage amplitude, pre-fault steady-state duration, and post-fault duration;

[0085] The fault characteristic parameters corresponding to light-load faults include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage-current phase angle difference, current amplitude change rate, termination current amplitude, pre-fault steady-state duration, and post-fault duration;

[0086] The fault characteristic parameters corresponding to overload faults include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage-current phase angle difference, current amplitude change rate, termination current amplitude, pre-fault steady-state duration, and post-fault duration;

[0087] Taking the fault type of three-phase short circuit as an example, the calculation formula for the instantaneous value of channel sampling is determined as follows:

[0088] When 0 ≤ t < T:

[0089] u a = A u1 sin(2πft);

[0090] u b = A u1 sin(2πft + 3π / 2);

[0091] u c = A u1 sin(2πft - 3π / 2);

[0092]

[0093] When T 1 ≤ t < T 1 + T 2When:

[0094] u a = A u2 sin2πft;

[0095] u b = A u2 sin(2πft + 3π / 2);

[0096] u c = A u2 sin(2πft - 3π / 2);

[0097]

[0098]

[0099] When T 1 + T 2 ≤ t < T 1 + T 2 + T 3 When:

[0100] u a = A u3 sin2πft;

[0101] u b = A u3 sin(2πft + 3π / 2);

[0102] u c = A u3 sin(2πft - 3π / 2);

[0103]

[0104] i a = 0;

[0105] i b = 0;

[0106] i c = 0;

[0107] Among them, u a represents the instantaneous value of the sampled A-phase voltage, u b represents the instantaneous value of the sampled B-phase voltage, u c represents the instantaneous value of the sampled C-phase voltage, i a represents the instantaneous value of the sampled A-phase current, i b represents the instantaneous value of the sampled B-phase current, i c represents the instantaneous value of the sampled C-phase current, t represents time, A u1 represents the steady-state voltage amplitude, A i1represents the steady-state current amplitude, and f represents the steady-state frequency. represents the in-phase voltage-current phase angle difference, A u2 represents the fault voltage amplitude, A i2 represents the fault current amplitude, T 1 represents the steady-state duration before the fault, T 2 represents the trip waiting delay, T 3 represents the duration after the fault;

[0108] Taking the fault type of non-fault trip as an example, the calculation formula for the instantaneous channel sampling value is determined as follows:

[0109] When 0 ≤ t < T 1 +T 2 :

[0110] u a =A u1 sin2πft;

[0111] u b =A u1 sin(2πft + 3π / 2);

[0112] u c =A u1 sin(2πft - 3π / 2);

[0113]

[0114] When T 1 +T 2 ≤t<T 1 +T 2 +T 3 :

[0115] u a =A u2 sin2πft;

[0116] u b =A u2 sin(2πft + 3π / 2);

[0117] u c =A u2 sin(2πft - 3π / 2);

[0118]

[0119]

[0120] After the analog output plug-in determines the calculation formula for the instantaneous channel sampling value, the process of calculating the instantaneous channel sampling value by looking up a table is as follows:

[0121] During the sampling interruption, obtain the current time information. According to the channel sampling instantaneous value calculation formula, calculate the current sine angle, and then query the corresponding trigonometric function value in the pre-set trigonometric function table, and calculate the channel sampling instantaneous value of the current sampling interruption in combination with the amplitude.

[0122] After the digital output plug-in receives the status sequence containing the fault type and fault characteristic parameters sent by the test master station and reaches the synchronous start time, determine the channel output instantaneous value calculation formula according to the fault type in the current status sequence during each sampling interruption, and then calculate the channel output instantaneous value.

[0123] The channel output instantaneous value has only two values, 0 or 1. The channel output instantaneous value formula is as follows:

[0124] z = Z(z 0 , t 1 , t 2 , …, t p );

[0125] Among them, z represents the channel output instantaneous value, and Z(z 0 , t 1 , t 2 , …, t p ) represents the channel output instantaneous value expression containing constants z 0 , t 1 , t 2 , …, t p , and z 0 represents the channel output starting value, and t p represents the p-th change time of the channel output instantaneous value;

[0126] The signal state value expression Z(z 0 , t 1 , t 2 , …, t p ) constitutes the type of the grid fault digital signal. The constants z 0 , t 1 , t 2 , …, t p are the corresponding grid fault digital signal characteristic parameters. The fault type corresponds to a specific channel output instantaneous value expression Z(z 0 , t 1 , t 2 , …, t p ), and the fault characteristic parameters correspond to specific constants z 0 , t1, t2, …, t p ;

[0127] Taking the fault type of three-phase short circuit as an example, the channel output instantaneous value calculation formula is determined as follows:

[0128] Z HWJ-A = Z HWJ-B = Z HWJ-C = 1, 0 ≤ t < T 1 + T 2 ;

[0129] Z HWJ-A = Z HWJ-B = Z HWJ-C = 0, T 1 + T 2 ≤ t < T 1 + T 2 + T 3 ;

[0130] Z TWJ-A = Z TWJ-B = Z TWJ-C = 0, 0 ≤ t < T 1 + T 2 ;

[0131] Z TWJ-A = Z TWJ-B = Z TWJ-C = 1, T 1 + T 2 ≤ t < T 1 + T 2 + T 3 ;

[0132] Z AT = Z BT = Z CT = 0, 0 ≤ t < T 1 + T 2 ;

[0133] Z AT = Z BT = Z CT = 1, T 1 + T2 ≤ t < T 1 + T 2 + T 0 ;

[0134] Z AT = Z BT = Z CT = 0, T 1 + T 2 + T 0 ≤ t < T 1 + T 2 + T 3 ;

[0135] Among them, Z HWJ-A represents the instantaneous value of the opening of the A-phase HWJ signal, Z HWJ-BIndicates the instantaneous value of the B-phase HWJ signal output, Z HWJ-C Indicates the instantaneous value of the C-phase HWJ signal output, Z TWJ-A Indicates the instantaneous value of the A-phase TWJ signal output, Z TWJ-B Indicates the instantaneous value of the B-phase TWJ signal output, Z TWJ-C Indicates the instantaneous value of the C-phase TWJ signal output, Z AT Indicates the instantaneous value of the A-phase protection trip signal output, Z BT Indicates the instantaneous value of the B-phase protection trip signal output, Z CT Indicates the instantaneous value of the C-phase protection trip signal output, T 1 Indicates the steady-state duration before the fault, T 2 Indicates the tripping waiting delay, T 3 Indicates the duration after the fault, T 0 Indicates the protection trip pulse width time;

[0136] Taking the fault type of non-fault tripping as an example, the calculation formula for the instantaneous value of the channel output is as follows:

[0137] Z HWJ-A =Z HWJ-B =Z HWJ-C =1, 0 ≤ t < T 1 +T 2 ;

[0138] Z HWJ-A =Z HWJ-B =Z HWJ-C =0, T 1 +T 2 ≤ t < T 1 +T 2 +T 3 ;

[0139] Z TWJ-A =Z TWJ-B =Z TWJ-C =0, 0 ≤ t < T 1 +T 2 ;

[0140] Z TWJ-A =Z TWJ-B =Z TWJ-C =1, T 1 +T 2 ≤ t < T 1 +T 2 +T 3 ;

[0141] Z AT =Z BT =Z CT =0, 0 ≤ t < T 1 +T 2 ;

[0142] Z AT =Z BT =Z CT =1, T 1 +T 2 ≤t<T 1 +T 2 +T 0 ;

[0143] Z AT =Z BT =Z CT =0, T 1 +T 2 +T 0 ≤t<T 1 +T 2 +T 3 。

[0144] (7) The test terminal collects the action results of the stability control device and sends the action results to the test master station after the state sequence ends.

[0145] (8) The test master station judges the correctness of the action results of the stability control system based on the received action results to form a closed-loop test.

Claims

1. A closed-loop test method for a stabilization control system, characterized in that: The following steps are involved: (1) The test master station sends channel configuration information to the test terminal through the communication network, where the channel configuration information includes the fault type and fault characteristic parameters; (2) The test terminal determines the information integrity based on the received channel configuration information and sends the determination result to the test master station; (3) The test master station performs a function judgment based on the received judgment result. If the channel configuration information is complete, it sends a start instruction including the synchronization start time to the test terminal. Otherwise, it returns to step 1. (4) The test terminal judges the rationality of the command according to the received start command, and sends the judgment result to the test main station; (5) The test master station performs a function judgment based on the rationality judgment result of the received command. If the start command is unreasonable, a cancel start command is sent to the test terminal, and the process returns to step 3. (6) When the test terminal reaches the synchronous start time, according to the received channel configuration information, the corresponding channel sampling instantaneous value formula is selected to calculate and generate the channel sampling instantaneous value, and the corresponding channel output instantaneous value formula is selected to calculate and generate the channel output instantaneous value, and output it to the stabilization control device; (7) The test terminal collects the action results of the stabilization and control device and sends the action results to the test master station after the state sequence is completed; (8) The test master station determines the correctness of the stabilization and control system action results based on the received action results, generates a test report, and forms a closed-loop test.

2. The closed-loop test method of the stabilization control system according to claim 1, characterized in that: The fault types described in step 1 include single instantaneous fault of phase A, single instantaneous fault of phase B, single instantaneous fault of phase C, single permanent fault of phase A, single permanent fault of phase B, single permanent fault of phase C, AB phase-to-phase fault, BC phase-to-phase fault, AC phase-to-phase fault, three-phase short circuit, no-fault tripping, underfrequency fault, overfrequency fault, undervoltage fault, overvoltage fault, light load fault, and overload fault.

3. The closed-loop test method of the stabilization control system according to claim 1, characterized in that: The fault characteristic parameters described in step 1 include steady-state voltage amplitude, steady-state current amplitude, steady-state frequency, in-phase voltage and current phase difference, fault voltage amplitude, fault current amplitude, steady-state duration before fault, trip waiting delay, reclosing waiting delay, reclosing failure trip waiting delay, post-fault duration, protection pulse width time, frequency change rate, termination frequency, voltage amplitude change rate, termination voltage amplitude, current amplitude change rate, and termination current amplitude.

4. The closed-loop test method of the stabilization control system according to claim 1, characterized in that: The formula for the instantaneous value of channel sampling in step 6 is as follows: Among them, y represents the instantaneous value of channel sampling, t represents time, A(t, A1, A2, ..., A i ) means that it contains constants A1, A2, ..., A i The amplitude expression of f(t, f1, f i , …, f m ) means it contains constants f1, f i , …, f m The frequency expression of Indicates that it contains constants The phase angle expression of The fault characteristic parameters include constants A1, A2, ..., A i ,f1,f i , …, f m , The fault type corresponds to a channel sampling instantaneous value calculation formula composed of an amplitude expression, a frequency expression and a phase angle expression.

5. The closed-loop test method of the stabilization control system according to claim 4, characterized in that: The amplitude expression is: A(t,A0,K A ,T)=A0+K A t,0≤t<T; Among them, A0 represents the starting amplitude, K A Indicates the amplitude change rate, T indicates the time to satisfy the instantaneous value calculation formula of the current channel sampling; The frequency expression is: f(t, f0, K f , T)=f0+K f t, 0≤t<T; Where f0 represents the starting frequency, K f Indicates the rate of change of frequency; The phase angle expression is: in, represents the starting phase angle, Represents the rate of change of phase angle.

6. The closed-loop test method of the stabilization control system according to claim 1, characterized in that: The formula for the instantaneous value of the channel in step 6 is as follows: z=Z(z0,t1,t2,…,t p ); Where z represents the instantaneous value of the channel opening, Z(z0, t1, t2, ..., t p ) means that it contains constants z0, t1, t2, ..., t p The instantaneous value expression of the channel opening, z0 represents the channel opening starting value, t p Indicates the moment when the instantaneous value of the channel changes for the pth time; The channel opens an instantaneous value expression Z(z0, t1, t2, ..., t p ) constitutes the type of fault switch signal; the constants z0, t1, t2, ..., t p Corresponding fault switch signal characteristic parameters, the fault type corresponding channel opens the instantaneous value expression Z (z0, t1, t2, ..., t p ), the fault characteristic parameters include constants z0, t1, t2, ..., t p .

7. The closed-loop test method of the stabilization control system according to claim 1, characterized in that: During the closed-loop test described in step 8, the test master station continuously receives the heartbeat message sent by the test terminal. If the heartbeat message is not received within a timeout period, an alarm is issued to prompt a check of the communication network and the test terminal.

8. A closed-loop test system for a stabilization control system, characterized in that: include: The test master station is used to set multiple fault types and corresponding fault characteristic parameters, form multiple state sequences containing fault types and corresponding fault characteristic parameters, and send the state sequences to the test terminal, judge the correctness of the action of the stabilization control system according to the action results of the stabilization control device returned by the test terminal, and automatically generate a test report. The test master station includes management software running on the host computer; The test terminal is used to generate channel sampling instantaneous value and channel opening instantaneous value according to the received channel configuration information, output them to the stabilization control device, and send the action result data of the stabilization control device to the test main station; The communication network is used to place the test master station and the test terminal in the same virtual local area network, using the Internet of Things card of the telecom operator. The communication network includes Ethernet, optical fiber, communication cable, 4G, 5G and Wi-Fi.

9. The closed-loop test system of the stabilization control system according to claim 8, characterized in that: The test terminal internally comprises: Management plug-ins, used to uniformly manage plug-ins and data flows within the test terminal; Communication plug-in, used for communication between the test master station and the test terminal; Analog output plug-in for generating electrical quantity data; Switch output plug-in, used to generate switch data; Switch input plug-in, used to collect the action output node signal of the stabilization control device; The plug-ins communicate with each other using internal Ethernet or CAN network.

10. The closed-loop test system of the stabilization control system according to claim 8, characterized in that: The communication protocol between the test main station and the test terminal adopts the TCP / IP protocol.

Images