SVG field test technology and pricing method

Abstract

The invention discloses an SVG field test technology and pricing method, and the method comprises the following steps: manually switching on and off a main circuit breaker of a high-voltage side circuit breaker of an SVG branch transformer, checking the switching impact bearing capability of the transformer, the capability of transformer differential protection to avoid excitation surge current, and measuring the switching surge current of the transformer and the transient overvoltage when the transformer is switched. Carrying out an SVG transformer switching test; switching the SVG into a hot standby state to carry out an SVG live test; carrying out a no-load voltage generation test on the SVG; carrying out an emergency shutdown test on the SVG in a manual reactive mode; carrying out SVG main and standby system switching test and SVG manual reactive power control test; according to the SVG constant voltage control test, the test content and the test scheme of the field test are combined, the quota standard conforming to the current situation is formulated, then the requirement of actual management work is met, SVG application and popularization are facilitated, legal rights and interests of all parties can be maintained, and scientific and reasonable pricing is achieved.

Description

Technical Field

[0001] The invention belongs to the field of electric power technology, and specifically relates to an SVG field test technology and a pricing method. Background Art

[0002] In recent years, with the implementation of a number of networking projects such as the national grid connection, west-to-east power transmission, and ultra-high voltage test and demonstration projects, ultra-large-scale AC systems, AC / DC systems, and multi-DC feed-in systems have become the main characteristics of my country's power grid development, forming sending-end grids of different sizes and large-capacity receiving-end grids; at the same time, as my country accelerates the adjustment of its energy structure and actively promotes the development and utilization of new energy resources, the large-scale access systems of wind power generation and photovoltaic power generation, which are characterized by randomness, intermittency, and instability, have brought severe tests to the safe and stable operation of the system. It is urgent to select locations to arrange large-capacity dynamic reactive power compensation equipment to improve the system's dynamic voltage support capabilities.

[0003] SVG (static var generator), as an advanced dynamic reactive power compensation device, can be used to maintain or control node voltage, improve line transmission capacity, damp power oscillation, and improve the steady-state and transient stability of the system. It is an effective technical means to solve the problem of dynamic reactive power shortage in my country at this stage.

[0004] After the SVG is installed on site, the relevant parameters and performance need to be tested and verified to ensure that the SVG can achieve dynamic reactive power compensation function after it is put into operation. To this end, this application proposes SVG on-site test technology and pricing method. Summary of the invention

[0005] The purpose of the present invention is to provide an SVG field test technology and a pricing method in order to solve the above problems, thereby solving the problems mentioned in the background technology.

[0006] In order to solve the above problems, the present invention provides a technical solution:

[0007] The SVG field test technology includes the following steps:

[0008] S1. Manually close and open the main circuit breaker on the high-voltage side of the SVG branch transformer to assess the transformer's ability to withstand the impact of closing the circuit, the transformer's differential protection's ability to avoid the excitation inrush current, and measure the transformer's closing inrush current and transient overvoltage when switching the transformer, and conduct SVG transformer switching tests;

[0009] S2, put the SVG into hot standby state to conduct SVG live test;

[0010] S3. Conduct a no-load voltage generation test on the SVG;

[0011] S4. Emergency shutdown test of SVG in manual reactive mode;

[0012] S5. Test the switching of SVG main and standby systems and SVG manual reactive power control;

[0013] S6. Conduct constant voltage control test on SVG;

[0014] S7. Each set of SVG shall run stably for 30 minutes under the rated capacitive current and rated inductive current output under manual reactive power test or constant voltage test, and measure and record the temperature of cooling system, connection reactor, special transformer, busbar, fence, etc., and conduct temperature rise test;

[0015] S8. Run continuously for 30 minutes under the overload capacity of SVG to conduct overload capacity test;

[0016] S9, switch the locking and unlocking of the two groups of SVGs, and perform a remote control test on the SVGs;

[0017] S10, switch the two SVGs to local control mode and conduct a test on switching parallel capacitors;

[0018] S11. Perform background harmonic test on the system before SVG is put into use, and conduct trial operation after the experiment.

[0019] The SVG field test pricing method includes the following steps:

[0020] B1. Calculate labor costs based on the working time types of the number of ordinary workers and the number of technical workers;

[0021] B2. Calculate the cost of materials and machines based on the preliminary preparations, site cleaning materials and machines, and material consumption;

[0022] B3. Count other costs in the test and calculate the total cost of the test project based on the above costs.

[0023] The beneficial effects of the present invention are as follows: combining the test content and test plan of the field test, formulating quota standards that meet the current situation, thereby meeting the needs of actual management work, which is not only conducive to the application and promotion of SVG, but also can safeguard the legitimate rights and interests of all parties involved and achieve scientific and reasonable pricing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and the accompanying drawings.

[0025] Figure 1 This is the wiring diagram of the reactive power compensation device of the #2 main transformer in the station of the present invention. DETAILED DESCRIPTION

[0026] Example:

[0027] like Figure 1As shown in the figure, taking a substation expansion project as an example, based on the original 1 main transformer, a #2 main transformer is added. The #2 main transformer is equipped with 3 groups of 60MVar capacitors and 2 sets of SVG. The 2 sets of SVG are connected to the 66kVⅡ busbar through a 35 / 66kV step-up transformer.

[0028] 1. Field test:

[0029] 1SVG transformer switching test

[0030] 1. The main circuit breaker on the high voltage side of the SVG branch transformer should be manually closed and opened 5 times;

[0031] 2When the SVG branch is connected to the transformer for charging, the low-voltage side isolation switch is in the open position, which does not meet the SVG start-up conditions. Before charging, the SVG control cabinet terminals are short-circuited to force the high-voltage side circuit breaker of the SVG branch transformer to close.

[0032] 3) Each charging time is 15 minutes, and the next charging is carried out after 15 minutes after each charging.

[0033] 4) Assess the transformer's ability to withstand the impact of closing the switch, the transformer's differential protection's ability to avoid the excitation surge current, and measure the transformer's closing surge current and transient overvoltage when switching the transformer;

[0034] 5) The test of switching SVG transformer requires recording of 66kV and 35kV ground voltage and zero-sequence voltage, closing inrush current and zero-sequence current on both sides;

[0035] 2. SVG live test

[0036] 1) Before the test begins, put #3 and #4 SVG into hot standby mode;

[0037] 2) Confirm that the #3SVG and #4SVG control and protection devices have not reported any faults;

[0038] 3) Select the station control mode, set #3SVG to operate in constant device reactive power control, and send the reactive power target value of 5MVar;

[0039] 4) A "start command" is issued to the #3SVG control protection device through the station backend. The device closes the 321 circuit breaker switch and the #3SVG grid-connected bypass switch in sequence. The SVG outputs reactive power consistent with the reactive power target value.

[0040] 5) Issue a locking command to #3SVG and run stably for 5 minutes;

[0041] 6) Exit #3SVG;

[0042] 7) Select the station control mode, set #4SVG to operate in constant device reactive power control, and send the reactive power target value of 5MVar;

[0043] 8) A "start command" is issued to the #4SVG control protection device through the station backend. The device closes the 322 circuit breaker switch and the #4SVG grid-connected bypass switch in sequence. The SVG outputs reactive power consistent with the reactive power target value.

[0044] 9) Issue a locking command to #4SVG and run stably for 5 minutes; 10) Exit #4SVG;

[0045] 3. No-load voltage test

[0046] 1) Before the test begins, put #3 and #4 SVG into hot standby mode;

[0047] 2) Confirm that the #3SVG and #4SVG control and protection devices have not reported any faults;

[0048] 3) Select the station control mode, set #3SVG to operate in constant device reactive power control, and send the reactive power target value of 5MVar;

[0049] 4) A "start command" is issued to the #3SVG control protection device through the station backend. The device closes the 321 circuit breaker switch and the #3SVG grid-connected bypass switch in sequence. The SVG outputs reactive power consistent with the reactive power target value.

[0050] 5) Exit #3SVG device;

[0051] 6) Select the station control mode, set #4SVG to operate in constant device reactive power control, and send the reactive power target value of 5MVar;

[0052] 7) A "start command" is issued to the #4SVG control protection device through the station backend. The device closes the 322 circuit breaker switch and the #4SVG grid-connected bypass switch in sequence. The SVG outputs reactive power consistent with the reactive power target value.

[0053] 8) Exit #4SVG device;

[0054] 4. SVG emergency shutdown test

[0055] 1) Before the test begins, put #3 and #4 SVG into hot standby mode;

[0056] 2) Confirm that the #3SVG and #4SVG control and protection devices have not reported any faults;

[0057] 3) Set #3SVG to operate in manual reactive power mode and issue the minimum inductive reactive power target value of 2.4 MVar;

[0058] 4) Put #3SVG into operation, and after the SVG is unlocked and running, confirm that the reactive power output of the SVG is consistent with the reactive power target value;

[0059] 5) Manually press the #3SVG emergency stop button on site to observe whether the device exits normally and trips the 321 switch;

[0060] 6) Set #4SVG to operate in manual reactive power mode and issue the minimum inductive reactive power target value of 2.4MVar.

[0061] 7) Put #4SVG into operation, and after the SVG is unlocked and running, confirm that the reactive power output of the SVG is consistent with the reactive power target value;

[0062] 8) Manually press the #4SVG emergency stop button on site to observe whether the device exits normally and trips the 322 switch;

[0063] 5. SVG main and standby system switching test

[0064] l) Confirm that the #3SVG and #4SVG control and protection devices have not reported any faults;

[0065] 2) Set #3SVG to operate in manual reactive power mode and issue the minimum inductive reactive power target value of 2.4 MVar;

[0066] 3) Put #3SVG into operation, and after the SVG is unlocked and running, confirm that the reactive power output of the SVG is consistent with the reactive power target value;

[0067] 4) After 2 minutes of stable operation, perform manual master-slave switching through the monitoring interface, the control and protection system will switch to the master-slave state, and the device should operate normally;

[0068] 5) After running for 1-2 minutes, manually switch through the monitoring interface, the control and protection system will switch to the main and standby states again, and the device should operate normally;

[0069] 6) Set #4SVG to operate in manual reactive power mode and issue the minimum inductive reactive power target value of 2.4MVar.

[0070] 7) Put #4SVG into operation, and after the SVG is unlocked and running, confirm that the reactive power output of the SVG is consistent with the reactive power target value;

[0071] 8) After 2 minutes of stable operation, perform manual master-slave switching through the monitoring interface, and the #4SVG control and protection system will switch to the master-slave state, and the device should operate normally;

[0072] 9) After running for 1 to 2 minutes, perform manual master-slave switching through the monitoring interface, and the #4SVG control and protection system will switch to the master-slave state again, and the device should operate normally;

[0073] 6. SVG manual reactive power control test

[0074] 1) Before the test, #3SVG and #4SVG should be in the state of outputting the minimum inductive reactive power of 2.4MVar respectively.

[0075] 2) Both SVGs are set to manual reactive power control mode, and the "STATCOM steady-state maximum output current per unit" in the control setting is set to 1.1, and the "STATCOM maximum output reactive power" is set to 33 MVar;

[0076] 3) The reactive power target values ​​of #3SVG are issued in sequence, namely, the minimum inductive 2.4MVar, inductive 5MVar, inductive 10MVar, and inductive 15MVar, and each set of parameters runs for 2 minutes;

[0077] 4) Maintain the inductive output of #3SVG at 15MVar unchanged, and send the minimum inductive output of 2.4MVar, the minimum capacitive output of 2.4MVar, the capacitive output of 5MVar, the capacitive output of 10MVar, and the capacitive output of 15MVar to the #4SVG device in sequence. Each set of parameters runs for 2 minutes.

[0078] 5) Based on the inductive output of #3SVG 15MVar and the capacitive output of #4SVG 15MVar, the reactive power commands of #3SVG inductive 20MVar, #4SVG capacitive 20MVar, #3SVG inductive 25MVar, #4SVG capacitive 25MVar, #3SVG inductive 30MVar, and #4SVG capacitive 30MVar are issued in sequence. Each set of parameters runs for 2 minutes. Run for 30 minutes at the rated current. The inductive reactive power target value of #3SVG is issued in sequence until it reaches 1.1 times the inductive current or the maximum capacity allowed by the system voltage. The capacitive reactive power target value of #4SVG is issued in sequence until it reaches 1.1 times the capacitive current or the maximum capacity allowed by the system voltage. Run for 30 minutes and observe the responses of #3SVG and #4SVG. Pay attention to closely observe the temperature of the reactor and submodule.

[0079] 6) Based on the maximum inductive output of #3SVG and the maximum capacitive output of #4SVG, the commands of #4SVG capacitive 20MVar, #3SVG inductive 20MVar, #4SVG capacitive 10MVar, #3SVG inductive 10MVar, #4SVG minimum capacitive 2.4MVar, and #3SVG minimum inductive 2.4MVar are issued in sequence. Each set of parameters runs for half a minute.

[0080] 7) Reverse test: based on the minimum inductance of #3SVG 2.4MVar and the minimum capacitance of #4SVG 2.4MVar, the reactive power commands of #4SVG inductance 5MVar, #3SVG capacitance 5MVar, #4SVG inductance 10MVar, #3SVG capacitance 10MVar, #4SVG inductance 15MVar, #3SVG capacitance 15MVar are issued in sequence, and each set of parameters runs for 2 minutes;

[0081] 8) Based on the 15MVar output of #3SVG capacitive and 15MVar output of #4SVG, the reactive power commands of #4SVG inductive 20MVar, #3SVG capacitive 20MVar, #4SVG inductive 25MVar, #3SVG capacitive 25MVar, #4SVG inductive 30MVar, and #3SVG capacitive 30MVar are issued in sequence. Each set of parameters runs for 2 minutes. The inductive reactive power target value of #4SVG is issued in sequence until it reaches 1.1 times the maximum capacity allowed by the inductive current or system voltage, and the capacitive reactive power target value of #3SVG is issued in sequence until it reaches 1.1 times the maximum capacity allowed by the capacitive current or system voltage. Run for 30 minutes, observe the responses of #3SVG and #4SVG, and pay close attention to the temperature of the reactor and submodule;

[0082] 9) Based on the maximum capacitive output of #3SVG and the maximum inductive output of #4SVG, the commands of #3SVG capacitive 20MVar, #3SVG inductive 20MVar, #3SVG capacitive 10MVar, #4SVG inductive 10MVar, #3SVG minimum capacitive 2.4MVar, #4SVG minimum inductive 2.4MVar are issued in sequence. Each set of parameters runs for half a minute.

[0083] 7. SVG constant voltage control test

[0084] 1) Before the test, #3SVG and #4SVG are in manual reactive working mode, outputting minimum capacitive reactive power and minimum inductive reactive power respectively, and #4SVG is locked;

[0085] 2#3SVG issues a minimum inductive reactive power instruction of 2.4MVar;

[0086] 3) Issue instructions with the current 220kV side system voltage as the target value, set the voltage regulation slope to 0, and switch #3SVG to constant voltage control mode;

[0087] 4) Issue a voltage instruction to #3SVG with the current voltage of the 220kV side bus minus the voltage step as the target value (i.e. V220-dV);

[0088] 5) Wait for #3SVG to be regulated and remain stable, continue to issue voltage instructions with the regulated 220kV bus voltage minus the voltage step as the target value, wait for SVG to be regulated and remain stable, and continue in sequence until #3SVG outputs 1.1 times the rated inductive current or reaches the allowable system voltage value;

[0089] 6) Reverse regulation: issue a voltage command with the current bus voltage on the 220kV side plus the voltage step as the target value (i.e., V220+dV), wait for the SVG to be regulated and remain stable, and continue to issue a voltage command with the adjusted bus voltage on the 220kV side plus the voltage step as the target value, wait for the SVG to be regulated and remain stable; this is done in sequence until the #3SVG outputs 1.1 times the capacitive rated current or reaches the system voltage allowable value;

[0090] 7) Reduce the output of #3SVG and issue a voltage command with the current voltage of the 220kV bus minus the voltage step as the target value (i.e. V220-dV) until #3SVG outputs the minimum capacitive reactive power;

[0091] 8) Lock #3SVG;

[0092] 9) Unlock #4SVG, #4SVG is in manual reactive working mode, and should output minimum inductive reactive power of 2.4MVar;

[0093] 10) Issue instructions with the current 220kV side system voltage as the target value, set the voltage regulation slope to 0, and switch #4SVG to constant voltage control mode;

[0094] 11) Send the target value (V 220 -dV) voltage command;

[0095] 12) Wait for #4SVG to be regulated and remain stable, continue to issue voltage instructions with the regulated 220kV bus voltage minus the voltage step as the target value, wait for SVG to be regulated and remain stable, and continue in sequence until #4SVG outputs 1.1 times the rated inductive current or reaches the allowable system voltage value;

[0096] 13) Reverse regulation, send the current voltage of the 220kV bus plus the voltage step as the target value (i.e. VV 220 +dV), wait for the SVG to be regulated and remain stable, continue to issue voltage instructions with the adjusted 220kV side bus voltage plus the voltage step as the target value, wait for the SVG to be regulated and remain stable, and continue to do so in sequence until the #4SVG outputs 1.1 times the capacitive rated current or reaches the system voltage allowable value;

[0097] 14) Reduce the output of #4SVG and send the current voltage of the 220kV bus plus the voltage step as the target value (i.e. V 220 -dV) voltage command until #4SVG outputs minimum capacitive reactive power;

[0098] 15) Set the voltage regulation slope of #4SVG to 0.01, issue a command to #3SVG with the current 220kV side system voltage as the target value, set the voltage regulation slope to 0.01, and unlock #3SVG;

[0099] 16) Send the target value (V 220 -dV) voltage command;

[0100] 17) Wait for #3SVG and #4SVG to be regulated and remain stable, continue to issue voltage instructions with the adjusted 220kV bus voltage minus the voltage step as the target value, wait for SVG to be regulated and remain stable, and continue in sequence until #3SVG and #4SVG output 1.1 times the rated inductive current or reach the allowable system voltage value;

[0101] 18) Reverse regulation, send the current voltage of the 220kV bus plus the voltage step as the target value (i.e. V 220 +dV), wait for the SVG to be regulated and remain stable, continue to issue voltage instructions with the adjusted 220kV side bus voltage plus the voltage step as the target value, wait for the SVG to be regulated and remain stable, and continue to issue voltage instructions in sequence until #3SVG and #4SVG output 1.1 times the capacitive rated current or reach the system voltage allowable value;

[0102] 19) Send the current voltage of the 220kV bus minus the voltage step as the target value (i.e. V 220 -dV) voltage command until #3SVG and #4SVG output minimum capacitive reactive power;

[0103] 8. Temperature rise test

[0104] l) Under manual reactive power test or constant voltage test, each set of SVG shall run stably for 30 minutes at rated capacitive current output;

[0105] 2) Under the manual reactive power test or constant voltage test, each set of SVG operates stably for 30 minutes at the rated inductive current output;

[0106] 3) Measure and record the temperature of the cooling system, connecting reactors, special transformers, busbars, fences, etc.;

[0107] 9. Overload capacity test

[0108] According to the overload capacity required by the technical specifications (generally 1.1 times overload for long-term operation), the device should be tested for continuous operation for 30 minutes. There should be no alarm information, no protection action, no equipment abnormality, and the temperature rise should not exceed the allowable value;

[0109] 10. SVG remote control test

[0110] 1) On the basis that #3SVG outputs the minimum capacitive reactive power and #4SVG outputs the minimum capacitive reactive power, #4SVG is locked;

[0111] 2) Set the remote control to send 15MVar of inductive reactive power and switch the local control to remote control;

[0112] 3) Modify the 220kV voltage upper limit value, so that the current system voltage is about 0.3kV higher than the upper limit value (or lower than the lower limit value), and detect whether #3SVG can adjust the reactive power output according to the target value and adjust the system voltage;

[0113] 4) Restore the voltage limit to make the current system voltage qualified, and the output reactive power of #3SVG should be restored to 15MVar inductive reactive power;

[0114] 5) Lock #3SVG;

[0115] 6) Unlock #4SVG;

[0116] 7) Set the remote control to send 15MVar of inductive reactive power, and switch the local control to remote control;

[0117] 8) Set the voltage target value and the voltage regulation slope to 0;

[0118] 9) Modify the 220kV voltage upper limit value, so that the current system voltage is about 0.3V higher than the upper limit (or lower than the lower limit), and detect whether #4SVG can adjust the reactive power output according to the target value and adjust the system voltage;

[0119] 10) Restore the voltage limit to make the current system voltage qualified, and the output reactive power of #4SVG should be restored to 15MVar inductive reactive power;

[0120] 11) Unlock #3SVG, set the remote control to send 30MVar of inductive reactive power, and observe the output reactive power of #3SVG and #4SVG;

[0121] 12) Set the voltage target value and the voltage regulation slope to 0.01;

[0122] 13) Modify the 220kV voltage upper limit value, so that the current system voltage is about 0.5kV higher than the upper limit (or lower than the lower limit), and detect whether #3SVG and #4SVG can adjust the reactive power output according to the target value and adjust the system voltage;

[0123] 14) Restore the voltage limit to make the current system voltage qualified, and the output reactive power of #3SVG and #4SVG should be restored to 30MVar inductive reactive power;

[0124] 11. Switching parallel capacitor test

[0125] 1) Following the previous test, switch the two SVGs to local control mode, set #3SVG to output minimum inductive reactive power, and switch the control to manual reactive power mode;

[0126] 2#5 capacitor switches to hot standby;

[0127] 3) Send the current system voltage as the target value to #4SVG, and switch #4SVG to constant voltage control; 4) Send the inductive 30MVar reactive power instruction to #3SVG;

[0128] 5) The station operator switches the 621 switch from hot standby to operation, puts the #5 capacitor bank into operation, and checks the responses of #3SVG and #4SVG;

[0129] 6) After the responses of the two SVGs are stable, disconnect the 621 switch and exit the #5 capacitor bank;

[0130] 7) After the system runs stably, a reactive power command is issued to the current reactive power output of #4SVG, which is the manual reactive power target value, and the control is switched to manual reactive power control;

[0131] 8) Issue the minimum inductive reactive power instruction to #4SVG;

[0132] 9) Send the minimum inductive reactive power command to #3SVG, take the current system voltage as the target value and send it to #3SVG, switching the control to constant voltage control;

[0133] 10) Issue 30MVar inductive reactive power command to #4SVG;

[0134] 11) The station operator switched the 621 switch from hot standby to operation, put the #5 capacitor bank into operation, and checked the responses of #3SVG and #4SVG;

[0135] 12) After the responses of the two SVGs are stable, disconnect the 621 switch and exit the #5 capacitor bank;

[0136] 13) After the system runs stably, the current reactive power output of #3SVG is used as the manual reactive power target value, and #3SVG is switched to manual reactive power control;

[0137] 14) Issue inductive reactive power instructions to #3SVG and #4SVG respectively until #3SVG and #4SVG are both in the minimum inductive reactive power state;

[0138] 15) Exit #3SVG and #4SVG;

[0139] 12. Harmonic test

[0140] 1) Perform background harmonic test on the system when SVG is not used;

[0141] 2) When the SVG is in a small capacitive load such as 5MVar, half rated capacity 15MVar, and rated capacity 30MVar, respectively, test the harmonic voltage and harmonic current on the high and low voltage sides of the two sets of SVG main transformers;

[0142] 3) When the SVG is in a small inductive load such as 5MVar, half rated capacity 15MVar, and rated capacity 30MVar, respectively test the harmonic voltage and harmonic current on the high and low voltage sides of the two sets of SVG main transformers;

[0143] 13. Trial operation

[0144] 1) After completing the above system tests and all test results are normal, start trial operation;

[0145] 2) During the trial operation, the two SVG devices are set to the same control mode as in normal operation;

[0146] 3) Continuous trial operation for 72 hours;

[0147] 4) During the trial operation, if the device is locked or tripped due to its own reasons, the trial operation will be interrupted and it needs to be put back into the trial operation state after it returns to normal.

[0148] SVG field test pricing method:

[0149] B1. Calculate labor costs based on the working time types of the number of ordinary workers and the number of technical workers;

[0150] Ordinary workers: ∑(number of ordinary workers in each process × time consumption) + labor amplitude difference;

[0151] Technical workers: ∑(number of technical workers in each process × time consumption) + labor amplitude difference;

[0152] Working hours include: basic working hours, auxiliary working hours, preparation and end of work time, unavoidable interruption time and rest time;

[0153] B2. Calculate the cost of materials and machines based on the preliminary preparations, site cleaning materials and machines, and material consumption;

[0154] B3. Count other costs in the test and calculate the total cost of the test project based on the above costs.

[0155] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. SVG field test technology, characterized in that: The following steps are involved: S1. Manually close and open the main circuit breaker on the high-voltage side of the SVG branch transformer to assess the transformer's ability to withstand the impact of closing the circuit, the transformer's differential protection's ability to avoid the excitation inrush current, and measure the transformer's closing inrush current and transient overvoltage when switching the transformer, and conduct SVG transformer switching tests; S2, put the SVG into hot standby state to conduct SVG live test; S3. Conduct a no-load voltage generation test on the SVG; S4. Emergency shutdown test of SVG in manual reactive mode; S5. Test the switching of SVG main and standby systems and SVG manual reactive power control; S6. Conduct constant voltage control test on SVG; S7. Each set of SVG shall run stably for 30 minutes under the rated capacitive current and rated inductive current output under manual reactive power test or constant voltage test, and the temperature of cooling system, connection reactor, special transformer, busbar, fence, etc. shall be measured and recorded, and temperature rise test shall be carried out; S8. Run continuously for 30 minutes under the overload capacity of SVG to conduct overload capacity test; S9, switch the locking and unlocking of the two groups of SVGs, and perform a remote control test on the SVGs; S10, switch the two SVGs to local control mode and conduct a test on switching parallel capacitors; S11. Perform background harmonic test on the system before SVG is put into use, and conduct trial operation after the experiment.

2. The SVG field test technology according to claim 1, characterized in that: The steps of the SVG live test are as follows: S21, put #3 and #4 SVG into hot standby state; S22, confirm that the #3SVG and #4SVG control and protection devices have not reported any faults; S23, select the station control mode, set #3SVG to operate in constant device reactive power control, and send the reactive power target value of 5MVar; S24, a "start command" is issued to the #3SVG control protection device through the station backend, and the device closes the 321 circuit breaker switch and the #3SVG grid-connected bypass switch in sequence, and the SVG outputs reactive power consistent with the reactive power target value; S25, issue a locking command to #3SVG, run stably for 5 minutes, and exit #3SVG; S26, select the station control mode, set #4SVG to operate in constant device reactive power control, and send the reactive power target value of 5MVar; S27, a "start command" is issued to the #4SVG control protection device through the station backend, and the device closes the 322 circuit breaker switch and the #4SVG grid-connected bypass switch in sequence, and the SVG outputs reactive power consistent with the reactive power target value; S28. Issue a locking command to #4SVG, run stably for 5 minutes, and exit #4SVG.

3. The SVG field test technology according to claim 1, characterized in that: The steps of the SVG no-load voltage generation test are as follows: S31, put #3 and #4 SVG into hot standby state; S32, confirm that the #3SVG and #4SVG control and protection devices have not reported any faults; S33, select the station control mode, set #3SVG to operate in constant device reactive power control, and send the reactive power target value of 5MVar; S34, a "start command" is issued to the #3SVG control protection device through the backend of the station, and the device closes the 321 circuit breaker switch and the #3SVG grid-connected bypass switch in sequence, and the SVG outputs reactive power consistent with the reactive power target value, and the #3SVG device exits; S35, select the station control mode, set #4SVG to operate in constant device reactive power control, and send the reactive power target value of 5MVar; S36. A "start command" is issued to the #4SVG control protection device through the station background. The device closes the 322 circuit breaker switch and the #4SVG grid-connected bypass switch in sequence. The SVG outputs reactive power consistent with the reactive power target value and exits the #4SVG device.

4. The SVG field test technology according to claim 1, characterized in that: The steps of the SVG emergency shutdown test are as follows: S41, put #3 and #4 SVG into hot standby state; S42, confirm that the #3SVG and #4SVG control and protection devices have not reported any faults; S43, set #3SVG to operate in manual reactive mode, and issue the minimum inductive reactive target value of 2.4 MVar; S44, put #3SVG into operation, after the SVG is unlocked and running, confirm that the reactive power output of the SVG is consistent with the reactive power target value; S45, manually press the #3SVG emergency stop button on the spot to observe whether the device exits normally and trip the 321 switch; S46, set #4SVG to operate in manual reactive mode, and issue the minimum inductive reactive target value of 2.4MVar; S47. Put #4SVG into operation. After the SVG is unlocked and running, confirm that the reactive power output by the SVG is consistent with the reactive power target value.

5. The SVG field test technology according to claim 1, characterized in that: The steps of the SVG active / standby system switching test are as follows: S51, confirm that the #3SVG and #4SVG control protection devices have not reported any faults; S52, set #3SVG to operate in manual reactive mode, and issue the minimum inductive reactive target value of 2.4 MVar; S53, put #3SVG into operation, wait for SVG to be unlocked and run, and confirm that the reactive power output of SVG is consistent with the reactive power target value; S54, run stably for 2 minutes, and perform manual master-slave switching through the monitoring interface. The control and protection system will switch to the master-slave state, and the device should operate normally; S55, run for 1-2 minutes, and manually switch through the monitoring interface. The control and protection system will switch to the main and standby states again, and the device should operate normally; S56, set #4SVG to operate in manual reactive mode, and issue the minimum inductive reactive target value of 2.4MVar; S57, put #4SVG into operation, wait for SVG to be unlocked and run, and confirm that the reactive power output of SVG is consistent with the reactive power target value; S58, run stably for 2 minutes, and perform manual master-slave switching through the monitoring interface. The #4SVG control and protection system will switch to the master-slave state, and the device should operate normally; S59, run for 1-2 minutes, perform manual master-slave switching through the monitoring interface, the #4SVG control and protection system will switch to the master-slave state again, and the device should operate normally.

6. The SVG field test technology according to claim 1, characterized in that: The SVG manual reactive power control test steps are as follows: A51. Before the test, adjust #3SVG and #4SVG to the state of outputting the minimum inductive reactive power of 2.4MVar; A52, both SVGs are set to manual reactive power control mode, and the "STATCOM steady-state maximum output current per unit" in the control setting is set to 1.1, and the "STATCOM maximum output reactive power" is set to 33MVar; A53, the reactive power target values ​​of #3SVG are issued in sequence, which are the minimum inductive 2.4MVar, inductive 5MVar, inductive 10MVar, and inductive 15MVar, and each set of parameters runs for 2 minutes; A54, maintain the inductive output of #3SVG 15MVar unchanged, and send the minimum inductive output of 2.4MVar, the minimum capacitive output of 2.4MVar, the capacitive output of 5MVar, the capacitive output of 10MVar, and the capacitive output of 15MVar to the #4SVG device in sequence. Each set of parameters runs for 2 minutes. A55. Based on the 15MVar output of #3SVG inductive and 15MVar output of #4SVG capacitive, the reactive power commands of #3SVG inductive 20MVar, #4SVG capacitive 20MVar, #3SVG inductive 25MVar, #4SVG capacitive 25MVar, #3SVG inductive 30MVar, and #4SVG capacitive 30MVar are issued in sequence. Each set of parameters runs for 2 minutes and runs for 30 minutes at rated current. The inductive reactive power target value of #3SVG is issued in sequence until it reaches 1.1 times the inductive current or the maximum capacity allowed by the system voltage, and the capacitive reactive power target value of #4SVG is issued until it reaches 1.1 times the capacitive current or the maximum capacity allowed by the system voltage. Run for 30 minutes and observe the responses of #3SVG and #4SVG. A56. Based on the maximum inductive output of #3SVG and the maximum capacitive output of #4SVG, the commands of #4SVG capacitive 20MVar, #3SVG inductive 20MVar, #4SVG capacitive 10MVar, #3SVG inductive 10MVar, #4SVG minimum capacitive 2.4MVar, and #3SVG minimum inductive 2.4MVar are issued in sequence. Each set of parameters runs for half a minute. A57. Experiment with #3SVG and #4SVG in reverse order.

7. The SVG field test technology according to claim 1, characterized in that: The steps of the SVG constant voltage control test are as follows: S61, adjust #3SVG and #4SVG to the manual reactive working mode, output the minimum capacitive reactive power and the minimum inductive reactive power respectively, and lock #4SVG; S62, #3SVG issued the minimum inductive reactive power instruction of 2.4MVar; S63, issue a command with the current 220kV side system voltage as the target value, set the voltage regulation slope to 0, and switch #3SVG to the constant voltage control mode; S64, issue a voltage instruction to #3SVG with the current voltage of the 220kV side bus minus the voltage step as the target value; S65, wait for #3SVG to be regulated and remain stable, continue to issue voltage instructions with the regulated 220 kV side bus voltage minus the voltage step as the target value, wait for SVG to be regulated and remain stable, and continue in sequence until #3SVG outputs 1.1 times the rated inductive current or reaches the allowable value of the system voltage; S66, reverse regulation: issue a voltage command with the current bus voltage on the 220kV side plus the voltage step as the target value, wait for the SVG to be regulated and remain stable, continue to issue a voltage command with the adjusted bus voltage on the 220kV side plus the voltage step as the target value, wait for the SVG to be regulated and remain stable, and continue in sequence until the #3SVG outputs 1.1 times the capacitive rated current or reaches the system voltage allowable value; S67, reduce the output of #3SVG, and issue a voltage command with the current voltage of the 220kV side bus minus the voltage step as the target value until #3SVG outputs the minimum capacitive reactive power; S68. Lock #3SVG and unlock #4SVG to conduct reverse experiment.

8. The SVG field test technology according to claim 1, characterized in that: The steps of the SVG remote control test are as follows: S91, on the basis that #3SVG outputs the minimum capacitive reactive power and #4SVG outputs the minimum capacitive reactive power, #4SVG is locked; S92, set the remote control to send 15MVar of inductive reactive power, and switch the local control to remote control; S93, modify the 220kV voltage upper limit value, so that the current system voltage is about 0.3kV higher than the upper limit value, and detect whether #3SVG can adjust the reactive power output according to the target value and adjust the system voltage; S94, restore the voltage limit to make the current system voltage qualified, and the output reactive power of #3SVG should be restored to 15MVar inductive reactive power; S95. Lock #3SVG, unlock #4SVG and conduct reverse test.

9. The SVG field test technology according to claim 1, characterized in that: The steps of the SVG switching parallel capacitor test are as follows: S101, switch the two SVGs to local control mode, set #3SVG to output minimum inductive reactive power, and switch the control to manual reactive power mode; S102, switch capacitor #5 to hot standby; S103, sending the current system voltage as the target value to #4SVG, switching #4SVG to constant voltage control; S104, issue a 30MVar inductive reactive power command to #3SVG; S105, switch 621 from hot standby to operation, put capacitor bank #5 into operation, and check the response of #3SVG and #4SVG; S106, after the responses of the two SVGs are stable, disconnect the 621 switch and exit the #5 capacitor bank; S107, after the system runs stably, a reactive power instruction is issued to #4SVG with the current reactive power output being the manual reactive power target value, and the control is switched to manual reactive power control; S108, issue the minimum inductive reactive power instruction to #4SVG; S109, sending a minimum inductive reactive power instruction to #3SVG, taking the current system voltage as the target value, and switching the control to constant voltage control; S1010, issue 30MVar inductive reactive power instruction to #4SVG; S1011, switch 621 from hot standby to operation, put capacitor bank #5 into operation, and check the response of #3SVG and #4SVG; S1012, after the responses of the two SVGs are stable, disconnect the 621 switch and exit the #5 capacitor bank; S103, after the system runs stably, the current reactive power output of #3SVG is used as the manual reactive power target value, and #3SVG is switched to manual reactive power control; S1014, respectively send inductive reactive power instructions to #3SVG and #4SVG until #3SVG and #4SVG are both in a minimum inductive reactive power state; S1015. Exit #3SVG and #4SVG.

10. SVG field test pricing method, characterized in that: The following steps are involved: B1. Calculate labor costs based on the working time types of the number of ordinary workers and the number of technical workers; B2. Calculate the cost of materials and machines based on the preliminary preparations, site cleaning materials and machines, and material consumption; B3. Count other costs in the test and calculate the total cost of the test project based on the above costs.

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