CN103296673B

CN103296673B - One ± 800kV extra-high voltage direct-current transmission engineering system adjustment method

Info

Publication number: CN103296673B
Application number: CN201310169696.6A
Authority: CN
Inventors: 杨万开; 印永华; 曾南超; 班连庚; 王华伟; 李新年; 谢国平; 王明新; 蒋卫平; 王亮; 刘耀; 孙栩; 杨鹏; 雷霄; 张晋华; 朱艺颖; 陈凌芳; 杨超
Original assignee: State Grid Corp of China SGCC; China Electric Power Research Institute Co Ltd CEPRI
Current assignee: State Grid Corp of China SGCC; China Electric Power Research Institute Co Ltd CEPRI
Priority date: 2013-05-09
Filing date: 2013-05-09
Publication date: 2016-01-20
Anticipated expiration: 2033-05-09
Also published as: CN103296673A

Abstract

The present invention relates to one ± 800kV extra-high voltage direct-current transmission engineering system adjustment method.System comprises two ends current conversion station and DC power transmission line, and the adjustment method for ± 800kV extra-high voltage direct-current transmission engineering system comprises: the computational analysis of (one) ± 800kV extra-high voltage direct-current transmission engineering system; (2) establishment ± 800kV extra-high voltage direct-current transmission engineering system debugging plan; (3) formulation ± 800kV extra-high voltage direct-current transmission engineering system debugging plan; (4) right ± 800kV extra-high voltage direct-current transmission engineering system carry out field adjustable test; (5) ± 800kV extra-high voltage direct-current transmission engineering system trial run; (6) ± 800kV extra-high voltage direct-current transmission engineering system debugging is summed up.Single converter, one pole and bipolar DC system debugging test combine by the present invention first, improve system debug test efficiency, accelerate the speed of system debug, good condition is created, for DC transmission engineering system debug from now on provides experience and reference for fulfiling system debug ahead of schedule.

Description

One ± 800kV extra-high voltage direct-current transmission engineering system adjustment method

Technical field

The present invention relates to extra-high voltage direct-current transmission field, be specifically related to one ± 800kV extra-high voltage direct-current transmission engineering system and adjustment method thereof.

Background technology

± 800kV extra-high voltage direct-current transmission engineering is with galvanic mode electric energy transmitting, compares with ± 500kV DC transmission engineering, and feature is that the capacity of transmitting electric power is large, distance, reaches more than 2000km, major loop wiring operational mode is many, and system configuration is complicated.The debugging of extra-high voltage DC transmission system is a very complicated system engineering, relate to DC engineering once with secondary device than ± 500kV DC transmission engineering is many, pilot project is many, also relate to the operational mode of AC system, need to carry out careful examination and inspection, system debug is combined closely the feature of extra-high voltage direct-current transmission engineering, carry out the simulation calculation of DC engineering sending end and receiving-end system trend and stability Calculation and direct current system debug-item, formulate system commissioning test program and test plan scheme, complete debug-item to safe and efficient high-quality, for the acceptance of work provides technical basis, ensure that engineering puts into operation on time, by the upwards system debug research of extra-high voltage direct-current transmission engineering and the practice of engineering, define a whole set of ± 800kV extra-high voltage direct-current transmission engineering system debugging method.

There is not yet both at home and abroad at present similar relevant ± the open report of 800kV ultra high voltage HVDC (High Voltage Direct Current) transmission system adjustment method.

Summary of the invention

For the deficiencies in the prior art, the object of this invention is to provide one ± 800kV extra-high voltage direct-current transmission engineering system, another object is to provide the adjustment method of one ± 800kV extra-high voltage direct-current transmission engineering system, extra-high voltage direct-current transmission engineering operation voltage is high, transmission power is large, transmission distance is far away, to equipment and system performance requirements higher.The system debug of engineering is the inspection to whole direct current system performance, therefore extra-high voltage direct-current system debug method ratio ± 500kV high voltage direct current transmission project is more detailed, content is abundanter, make debugging plan more comprehensively, careful formulation debugging plan and test plan, complete debug-item to safe and efficient high-quality, for the acceptance of work provides technical basis.

The object of the invention is to adopt following technical proposals to realize:

One ± 800kV extra-high voltage direct-current transmission engineering system, its improvements are, described system comprises two ends current conversion station and DC power transmission line, and described two ends current conversion station is connected by DC power transmission line; Two ends current conversion station all adopts bipolar converter, and every pole converter comprises 12 pulse conversion devices of 2 series connection, and series voltage is connected by ± (400+400) kV;

It is ± 800kV that single-ended current conversion station direct current one pole normally runs direct voltage, and it is 400kV that single 12-pulse conversion device runs direct voltage.

Preferably, the major loop mode of connection of ± 800kV extra-high voltage direct-current transmission engineering system comprises:

The <1> single converter mode of connection: comprise one pole metal and return half pressure 400kV operation and single pole-ground return half pressure 400kV operation;

The <2> one pole double converter mode of connection: comprise one pole metal return total head 800kV run and single pole-ground return total head 800kV run;

The bipolar mode of connection of <3>: comprise bipolar ± 800kV total head and run, bipolar uneven mixed-voltage runs and bipolar half voltage ± 400kV runs;

The <4> ice-melt mode of connection is run.

The present invention is based on the adjustment method of one ± 800kV extra-high voltage direct-current transmission engineering system that another object provides, its improvements are, described method comprises the steps:

(1) ± 800kV extra-high voltage direct-current transmission engineering system computational analysis;

(2) establishment ± 800kV extra-high voltage direct-current transmission engineering system debugging plan;

(3) formulation ± 800kV extra-high voltage direct-current transmission engineering system debugging plan;

(4) right ± 800kV extra-high voltage direct-current transmission engineering system carry out field adjustable test;

(5) ± 800kV extra-high voltage direct-current transmission engineering system trial run;

(6) ± 800kV extra-high voltage direct-current transmission engineering system debugging is summed up.

Preferably, in described step (), described ± 800kV extra-high voltage direct-current transmission engineering system computational analysis comprises:

(1) data file of debugging computational analysis for ± 800kV extra-high voltage direct-current transmission engineering system is generated;

(2) computational analysis of ± 800kV extra-high voltage direct-current transmission engineering system debugging operational mode;

(3) computational analysis of ± 800kV extra-high voltage direct-current transmission engineering system debug-item;

(4) the safety and stability computational analysis under ± 800kV extra-high voltage direct-current transmission engineering system debud mode and accident prevention measures analysis;

(5) ± 800kV extra-high voltage direct-current transmission engineering system electromagnetic transient overvoltage calculates.

Preferably, stop transport overvoltage that overvoltage that the overvoltage, the Inverter Station load rejection that cause cause, the online switching of single converter cause and one pole the earth metallic return of the overvoltage that the overvoltage that in described (5), electromagnetism steady-state overvoltage comprises overvoltage that ac bus single-phase earthing causes, converter valve pulse-losing causes, DC line fault cause, current conversion station DC side changes the overvoltage caused.

Preferably, in described step (), the technical supervision of current conversion station subsystem is carried out at scene, understands content and the pilot project of the debugging of current conversion station subsystem, and the result of the test of examination subsystem debugging and technical report, report subsystem technical supervision result to engineering owner.

Preferably, in described step (two), the major loop mode of connection according to single converter system, one pole double converter system, bipolar DC system and the online fling-cut system of single converter formulates described ± 800kV extra-high voltage direct-current transmission engineering system debugging plan, comprising:

The debugging plan of <1> single converter system;

The debugging plan of <2> one pole double converter system;

<3> bipolar DC system debugging plan;

<4> ice-melt mode of connection debugging plan.

Preferably, in described <1>, the major loop mode of connection of one pole single converter is divided into the basic mode of connection and converter improved cross connect mode, and the basic mode of connection comprises: pole I low side converter wiring mode, pole I high-end converter wiring mode, pole II low side converter wiring mode and the high-end converter wiring mode of pole II; Improved cross connect mode comprises: rectification side pole I low side converter is connected with the high-end converter of inverter side, the high-end converter of rectification side pole I is connected with inverter side low side converter, rectification side pole II low side converter is connected with the high-end converter of inverter side and the high-end converter of rectification side pole I is connected with inverter side low side converter;

The debugging plan of described single converter comprises the debugging plan of the basic mode of connection and the debugging plan of converter improved cross connect mode.

Preferably, the debugging plan of the described basic mode of connection comprises:

1) starting under greatly/metal connection mode/stoppage in transit test: for confirmations ± 800kV extra-high voltage direct-current transmission engineering system start/stoppage in transit function is normal, the safety that realization ± 800kV extra-high voltage direct-current transmission engineering system is tested is carried out;

2) trip protection test: normal for the action of confirmation ± 800kV extra-high voltage direct-current transmission engineering system trip protection, the safety of guarantee ± 800kV extra-high voltage direct-current transmission engineering system and equipment;

3) steady-state behaviour and operation, control model test: normal for confirming various operation, the function of control model and conversion thereof;

4) direct current mode of connection conversion: for testing monopolar ground return/metallic return translation function;

5) controller parameter Optimum Experiment: the method tested by step, is tested to DC transmission engineering system controller parameter;

6) Reactive Power Control test: whether meet code requirement (the Reactive Power Control test referred to is the functional verification test of current conversion station Reactive Power Control, checks current conversion station Reactive Power Control function whether to meet demand of technical standard by test) for checking current conversion station Reactive Power Control performance;

7) trigger impulse/commutation failure test lost by converter: for checking the performance of noiseproof of two ends current conversion station DC control and protection system, seeing and whether meeting code requirement;

8) single converter run DC line fault test: for checking DC line protection performance, fault restart order and FLU Fault Location Unit precision, see and whether meet demand of technical standard;

9) loss of auxiliary power, redundance unit and liaison test: whether action and handoff functionality for confirming accessory power supply, redundance unit and liaison device be normal, for the high-power test of DC transmission engineering system is prepared;

10) with the test of direct current system power modulation function: fall function and DC power modulation to the effect strengthening system damping for checking the grading, lifting of direct current power with returning;

11) rated power steady-state behaviour and operation, control model transfer test: for confirming when transmitting high-power, function and the conversion thereof of various operation, control model are normal;

Comprise: the direct current mode of connection is changed: for testing single converter Ground return/metallic return translation function; Converter transformer shunting switch Control experiment;

12) rated power and overload trial: for testing the temperature rise of DC transmission engineering system equipment, check the through-current capability of whole DC transmission engineering system; Earth electrode test, harmonic wave, noise and radio interference test are carried out at this moment;

13) Reactive Power Control test: whether meet demand of technical standard for checking current conversion station Reactive Power Control performance;

The debugging plan of described converter improved cross connect mode comprises:

Starting under I, greatly/metal connection mode/stoppage in transit test: for confirmations ± 800kV extra-high voltage direct-current transmission engineering system start/stoppage in transit function normally, to ensure that the safety of system test is carried out;

II, steady-state behaviour and operation test: normal for the function confirming power/current lifting, control system switches.

Preferably, in described <2>, the major loop mode of connection of one pole double converter system is divided into pole I and the pole II mode of connection;

The debugging plan of described one pole double converter system comprises:

Starting under A, greatly/metal connection mode/stoppage in transit test: for confirming that system start/stoppage in transit function is normal, to ensure that the safety of system test is carried out;

B, trip protection are tested: for confirming that system protection trip operation is normal, to ensure the safety of system and equipment;

C, steady-state behaviour and operation, control model test: normal for confirming various operation, the function of control model and conversion thereof;

D, the direct current mode of connection are changed: for testing monopolar ground return/metallic return translation function;

E, controller parameter Optimum Experiment: the method tested by step, tested to controller parameter;

F, Reactive Power Control are tested: whether meet code requirement for checking current conversion station Reactive Power Control performance;

G, monopolar operation DC line fault test: for checking DC line protection performance, fault restart order and FLU Fault Location Unit precision, see and whether meet code requirement;

H, loss of auxiliary power, redundance unit and liaison test: for confirming that the functions such as the action of these devices and equipment and switching all should be normal, for the high-power test of direct current system is got ready;

I, the test relevant with direct current system power modulation function: fall function and DC power modulation to the effect strengthening system damping with returning for checking the grading, lifting of direct current power;

J, rated power steady-state behaviour and operation, control model transfer test: for confirming when transmitting high-power, function and the conversion thereof of various operation, control model are normal;

Comprise: the direct current mode of connection is changed: for testing functions such as monopolar ground return/metallic return conversions;

K, rated power and overload trial: for testing equipment temperature rise, the through-current capability of inspection one pole direct current system; The test of alternating current-direct current harmonic wave, noise and radio interference is carried out at this moment;

L, Reactive Power Control are tested: whether meet code requirement for checking current conversion station Reactive Power Control performance.

Preferably, in described <3>, the major loop mode of connection of bipolar DC system is divided into the bipolar double converter mode of connection, two uneven converter wiring mode and the bipolar single converter mode of connection;

The debugging plan of described bipolar DC system comprises: the debugging plan of the bipolar double converter mode of connection, the debugging plan of two uneven converter wiring mode and the debugging plan of the bipolar single converter mode of connection.

Preferably, the debugging plan of the described bipolar double converter mode of connection comprises:

1. bipolar double converter direct current system plays/stops test:

For verifying bipolar double converter direct current system function that is normal and that stop transport without starting during communication, stoppage in transit and protection act;

2. pole tripping operation, power transfer is tested:

To bipolar operation, a pole tripping operation locking, power transfer function is checked to another pole;

3. power Control experiment:

For checking direct current system normal starting and stable operation under power control mode;

4. brownout operation test:

Whether normal for verifying bipolar brownout operation controlling functions;

5. upset test: for checking current conversion station supplementary AC electrical source exchange, whether DC fields neutral bus Region control defencive function meets demand of technical standard;

6. alternating current circuit Test to Failure:

For the impact checking fault in ac transmission system to run direct current system;

7. Reactive Power Control test:

The function that during for verifying that bipolar double converter runs, Reactive Power Control and alternating voltage control;

8. stability control equipment uniting and adjustment and the test of debugging with stability control equipment direct current: check the lifting of direct current power with return fall function, DC power modulation to strengthening ± effect of 800kV extra-high voltage direct-current transmission engineering system damping, and stability control equipment and DC control system interface are tested;

9. rated power and overload trial:

For the steady operation performance examining direct current to carry rated power, brownout operation, and various overladen ability; Alternating current-direct current harmonic wave, noise and radio interference are tested, checks whether and meet demand of technical standard; (demand of technical standard proposes in project engineering stage, comprises main performance and the Selecting parameter of primary equipment, the function etc. of linear quadratic control protection system.The research of the voltage according to DC engineering that specification proposes, specified transmission power, rated current and two ends AC system is determined.）

The debugging plan of described two uneven converter wiring mode comprises:

One) bipolar uneven converter direct current system plays/stops test:

For verifying Bipolar DC power system function that is normal and that stop transport without starting during communication, stoppage in transit and protection act;

Two) pole tripping operation, power transfer is tested:

Run bipolar uneven converter, locking is tripped in a pole, power transfer function is checked to another pole;

Three) power Control experiment:

Four) Reactive Power Control test:

The function that during for verifying that bipolar 3 converters run, Reactive Power Control and alternating voltage control;

Five) stability control equipment uniting and adjustment and the test of debugging with stability control equipment direct current: check the lifting of direct current power to fall function, DC power modulation to the effect strengthening system damping with returning, and the test of stability control equipment and DC control system interface;

The debugging plan of the described bipolar single converter mode of connection comprises:

I, bipolar single converter direct current system play/stop test:

Ii, pole tripping operation, power transfer is tested:

Iii, power Control experiment:

For checking, under power control mode, direct current system can normal starting and stable operation.

Iv, stability control equipment uniting and adjustment and the test of debugging with stability control equipment direct current: check the lifting of direct current power and return and fall function, DC power modulation to the effect strengthening system damping, and the various tests of stability control equipment and DC control system interface.

Preferably, in described step (four), organize DC engineering system for field debugging test; The tracking computational analysis of field adjustable testing program; Debugging test result is analyzed, evaluation is provided to DC transmission engineering Technical properties of plant.

Preferably, in described step (six), field adjustable data is arranged, filed; Right ± 800kV extra-high voltage direct-current transmission engineering system debug results is analyzed, is concluded; Write ± 800kV extra-high voltage direct-current transmission engineering system debugging technique report, debug results and conclusion are analyzed and researched, provides system debug conclusion.

Compared with the prior art, the beneficial effect that the present invention reaches is:

Compare with 500kV high voltage direct current transmission project system debug method, extra-high voltage direct-current transmission engineering system adjustment method has following advantage:

(1) ± 800kV extra-high voltage direct-current engineering major loop has 46 kinds of modes of connection, and ± 500kV high voltage direct current transmission project major loop has 5 kinds of modes of connection.In engineering system debug process, equipment performance under each mode of connection and function all will be tested, so extra-high voltage direct-current transmission engineering system debugging test project than ± 500kV high voltage direct current transmission project system test project is many, make debugging scope more comprehensive, provide foundation for equipment investment runs.

(2) extra-high voltage direct-current transmission engineering operation voltage is high, and transmission power is large, and transmission distance is far away, to equipment and system performance requirements higher.The system debug of engineering is the inspection to whole direct current system performance, therefore extra-high voltage direct-current system debug method ratio ± 500kV high voltage direct current transmission project is more detailed, and content is abundanter.

(3) extra-high voltage direct-current engineering system debug-item is many, and the system debug cycle is long, and system debug plan just seems particularly important.In order to high-quality and efficient ground completion system debugging task, combination is optimized to system debug project, ensures that equipment performance and Control protection function are fully verified.

(4) extra-high voltage direct-current transmission engineering transmission distance is far away, the water power in China western part can be transported to East Coastal one and be with developed area, effectively alleviate coastal region in east China power shortage situation, effectively facilitate economic development that is western and eastern region.

(5) extra-high voltage direct-current engineering major loop equipment is many, and system debug participant is more, and cooperatively interacting between Ge Cantiao unit is extremely important.Owing to being charged test, personal safety, device security and system safety problem are more outstanding, must strengthen cooperation and link up, and ensure that system debug is carried out putting into operation with engineering smoothly on schedule.

(6) single converter, one pole and bipolar DC system debugging test combine by the present invention first, improve system debug test efficiency, accelerate the speed of system debug, good condition is created, for DC transmission engineering system debug from now on provides experience and reference for fulfiling system debug ahead of schedule.

(7) the present invention proposes above-mentioned concrete system debug outline first time, and system-computed analysis, formulates system commissioning test program, organize the steps such as fielded system debugging test to combine, the adjustment method of composition extra-high voltage direct-current transmission engineering system.The method systematically solves various technical problem in extra-high voltage direct-current transmission engineering system debug process, according to the technology path that this method provides, to solve in DC engineering system debug process each preferably and participate in cooperation between construction engineering units and between engineering owner, what ensure that extra-high voltage direct-current engineering system debugs technically with tissue completes smoothly.

(8) the present invention is by the system debug of Burner zone-Shanghai, silk screen-southern Jiangsu extra-high voltage direct-current transmission engineering, define the Method and Technology route of a whole set of extra-high voltage direct-current transmission engineering system debugging, for the extra-high voltage direct-current transmission engineering system debugging of follow-up construction provides Experience and technology path.

Accompanying drawing explanation

Fig. 1 is provided by the invention ± 800kV extra-high voltage direct-current transmission engineering major loop winding diagram;

Fig. 2 is pole I provided by the invention high-end converter Ground return mode figure;

Fig. 3 is the high-end converter of pole I rectification side provided by the invention, inverter side low side converter Ground return mode figure;

Fig. 4 is pole provided by the invention I rectification side low side converter, inverter side high-end converter Ground return mode figure;

Fig. 5 is pole I low side converter Ground return mode figure provided by the invention;

Fig. 6 is pole II low side converter Ground return mode figure provided by the invention;

Fig. 7 is pole provided by the invention II rectification side low side converter, inverter side high-end converter Ground return mode figure;

Fig. 8 is the high-end converter of pole II rectification side provided by the invention, inverter side low side converter Ground return mode figure;

Fig. 9 is pole II provided by the invention high-end converter Ground return mode figure;

Figure 10 is pole I provided by the invention high-end converter metallic return mode figure;

Figure 11 is the high-end converter of pole I rectification side provided by the invention, inverter side low side converter metallic return mode figure;

Figure 12 is pole provided by the invention I rectification side low side converter, inverter side high-end converter metallic return mode figure;

Figure 13 is pole I low side converter metallic return mode figure provided by the invention;

Figure 14 is pole II low side converter metallic return mode figure provided by the invention;

Figure 15 is pole provided by the invention II rectification side low side, inverter side high-end single converter metallic return mode figure;

Figure 16 is that pole provided by the invention II rectification side is high-end, inverter side low side single converter metallic return mode figure;

Figure 17 is pole II provided by the invention high-end single converter metallic return mode figure;

Figure 18 is pole provided by the invention I double converter wiring, Ground return figure;

Figure 19 is pole provided by the invention II double converter wiring, Ground return figure;

Figure 20 is pole provided by the invention I double converter wiring, metallic return figure;

Figure 21 is pole provided by the invention I double converter wiring, metallic return figure;

Figure 22 is bipolar double converter mode of connection figure provided by the invention;

Figure 23 is pole provided by the invention II double converter wiring, the high-end converter wiring figure of pole I;

Figure 24 is pole provided by the invention II double converter, the high-end converter of rectification side pole I, inverter side low side converter wiring figure;

Figure 25 is pole provided by the invention II double converter, rectification side pole I low side converter, the high-end converter wiring figure of inverter side;

Figure 26 is pole provided by the invention II double converter, pole I low side converter wiring figure;

Figure 27 is pole provided by the invention I double converter, pole II low side converter wiring figure;

Figure 28 is pole provided by the invention I double converter, rectification side pole II low side converter, the high-end converter wiring figure of inversion side pole II;

Figure 29 is pole provided by the invention I double converter, the high-end converter of rectification side pole II, inversion side pole II low side converter wiring figure;

Figure 30 is pole provided by the invention I double converter, the high-end converter wiring figure of pole II;

Figure 31 is the high-end converter of rectification side pole I provided by the invention, pole II low side converter, the high-end converter of inversion side pole I, pole II low side converter wiring figure;

Figure 32 is inverter side low side converter provided by the invention, rectification side pole II low side converter, the high-end converter wiring figure of pole I;

Figure 33 is rectification side low side converter provided by the invention, inversion side pole II low side converter, the high-end converter wiring figure of pole I;

Figure 34 is bipolar low side converter wiring figure provided by the invention;

Figure 35 is the high-end converter of inverter side provided by the invention, rectification side pole II low side converter, the high-end converter wiring of pole I

Figure 36 is the high-end converter of rectification side pole I provided by the invention, pole II low side converter, inversion side pole I low side converter, the high-end converter wiring figure of pole II;

Figure 37 is rectification side low side converter provided by the invention, the high-end converter wiring figure of inverter side;

Figure 38 is rectification side low side converter provided by the invention, inversion side pole I low side converter, the high-end converter wiring figure of pole II;

Figure 39 is the high-end converter of rectification side provided by the invention, inversion side pole II low side converter, the high-end converter wiring figure of pole I;

Figure 40 is the high-end converter of rectification side provided by the invention, inverter side low side converter wiring figure;

Figure 41 is rectification side pole I low side converter provided by the invention, the high-end converter of pole II, the high-end converter of inversion side pole I, pole II low side converter wiring figure;

Figure 42 is inverter side low side converter provided by the invention, rectification side pole I low side converter, the high-end converter wiring figure of pole II;

Figure 43 is bipolar high-end converter wiring figure provided by the invention;

Figure 44 is the high-end converter of rectification side provided by the invention, inversion side pole I low side converter, the high-end converter wiring figure of pole II;

Figure 45 is the high-end converter of inverter side provided by the invention, rectification side pole I low side converter, the high-end converter wiring figure of pole II;

Figure 46 is rectification side pole 1 low side converter provided by the invention, the high-end converter in pole 2, inversion side pole 1 low side converter, the high-end converter wiring figure in pole 2;

Figure 47 is ice-melt mode of connection figure provided by the invention;

Figure 48 is the flow chart of the adjustment method of provided by the invention ± 800kV extra-high voltage direct-current transmission engineering system.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

The invention provides one ± 800kV extra-high voltage direct-current transmission engineering system, described system comprises two ends current conversion station and DC power transmission line, and two ends current conversion station is connected by DC power transmission line; Two ends current conversion station all adopts bipolar converter, and every pole converter comprises 12 pulse conversion devices of 2 series connection, and series voltage is connected by ± (400+400) kV;

It is ± 800kV that single-ended current conversion station direct current one pole normally runs direct voltage, and it is 400kV that single 12-pulse conversion device runs direct voltage.Provided by the invention ± 800kV extra-high voltage direct-current transmission engineering major loop winding diagram as shown in Figure 1.

According to ± 800kV extra-high voltage direct-current transmission the Principle of Engineering Design, its major loop has the following 8 class modes of connection.

(1) bipolar ± 800kV total head is run;

(2) bipolar uneven mixed-voltage runs (a pole double converter runs 800kV, and a pole single converter runs 400kV);

(3) bipolar half voltage ± 400kV runs (one, every pole converter runs);

(4) one pole metal returns total head 800kV operation;

(5) one pole metal returns half pressure 400kV operation (only having a converter to run);

(6) single pole-ground return total head 800kV runs;

(7) single pole-ground return half pressure 400kV runs (only having a converter to run);

(8) the ice-melt mode of connection runs (the high-end converter of pole I and the high-end converter parallel running of pole II).

In ± 800kV extra-high voltage direct-current transmission engineering debug process, the above-mentioned major loop mode of connection is divided into Four types, comprises:

The <4> ice-melt mode of connection is run.

Wherein: single converter has 16 kinds of modes of connection, total following 16 kinds of modes of connection:

Pole I high-end converter Ground return mode, its winding diagram as shown in Figure 2.

The high-end converter of pole I rectification side, inverter side low side converter Ground return mode, its winding diagram as shown in Figure 3.

Pole I rectification side low side converter, inverter side high-end converter Ground return mode, its winding diagram as shown in Figure 4.

Pole I low side converter Ground return mode, its winding diagram as shown in Figure 5.

Pole II low side converter Ground return mode, its winding diagram as shown in Figure 6.

Pole II rectification side low side converter, inverter side high-end converter Ground return mode, its winding diagram as shown in Figure 7.

The high-end converter of pole II rectification side, inverter side low side converter Ground return mode, its winding diagram as shown in Figure 8.

Pole II high-end converter Ground return mode, its winding diagram as shown in Figure 9.

Pole I high-end converter metallic return mode, its winding diagram as shown in Figure 10.

The high-end converter of pole I rectification side, inverter side low side converter metallic return mode, its winding diagram as shown in figure 11.

Pole I rectification side low side converter, inverter side high-end converter metallic return mode, its winding diagram as shown in figure 12.

Pole I low side converter metallic return mode, its winding diagram as shown in figure 13.

Pole II low side converter metallic return mode, its winding diagram as shown in figure 14.

Pole II rectification side low side, inverter side high-end single converter metallic return mode, its winding diagram as shown in figure 15.

Pole II rectification side is high-end, inverter side low side single converter metallic return mode, and its winding diagram as shown in figure 16.

Pole II high-end single converter metallic return mode, its winding diagram as shown in figure 17.

In the above single converter mode of connection, Fig. 2, Fig. 5, Fig. 6, Fig. 9 are the basic mode of connection of single converter Ground return, and Figure 13, Figure 14, Figure 10, Figure 17 are the basic mode of connection of single converter metallic return; Fig. 3, Fig. 4, Fig. 7, Fig. 8, Figure 11, Figure 12, Figure 15, Figure 16 are single converter improved cross connect mode.

Wherein, the one pole double converter mode of connection, total following 4 kinds of modes of connection:

Pole I double converter wiring, Ground return (C26), winding diagram as shown in figure 18.

Pole II double converter wiring, Ground return (C27), winding diagram as shown in figure 19.

Pole I double converter wiring, metallic return (C36), winding diagram as shown in figure 20.

Pole I double converter wiring, metallic return (C37), winding diagram as shown in figure 21.

Wherein, the bipolar mode of connection, comprises bipolar ± 800kV total head (bipolar double converter) mode of connection, and bipolar uneven mixed-voltage runs (the bipolar uneven mode of connection) and bipolar half voltage ± 400kV and runs (the bipolar single converter mode of connection).

The bipolar double converter mode of connection, only have a kind of mode of connection, winding diagram as shown in figure 22.

The bipolar uneven mode of connection, has following 8 kinds of modes of connection:

Pole II double converter wiring, the high-end converter wiring of pole I (C18), winding diagram as shown in figure 23.

Pole II double converter, the high-end converter of rectification side pole I, inverter side low side converter wiring (C19), winding diagram as shown in figure 24.

Pole II double converter, rectification side pole I low side converter, the high-end converter wiring of inverter side (C20), winding diagram as shown in figure 25.

Pole II double converter, pole I low side converter wiring (C21), winding diagram as shown in figure 26.

Pole I double converter, pole II low side converter wiring (C22), winding diagram as shown in figure 27.

Pole I double converter, rectification side pole II low side converter, the high-end converter wiring of inversion side pole II (C23), winding diagram as shown in figure 28.

Pole I double converter, the high-end converter of rectification side pole II, inversion side pole II low side converter wiring (C24), winding diagram as shown in figure 29.

Pole I double converter, the high-end converter wiring of pole II (C25), winding diagram as shown in figure 30.

In bipolar uneven converter wiring mode, Figure 27 is the basic mode of connection of bipolar uneven converter, Figure 23, Figure 24, Figure 25, Figure 26, Figure 28, and Figure 29, Figure 30 are bipolar uneven converter improved cross connect mode.

The bipolar single converter mode of connection, total following 16 kinds of modes of connection:

The high-end converter of rectification side pole I, pole II low side converter, the high-end converter of inversion side pole I, pole II low side converter wiring (C02), winding diagram as shown in figure 31.

Inverter side low side converter, rectification side pole II low side converter, the high-end converter wiring of pole I (C03), winding diagram as shown in figure 32.

Rectification side low side converter, inversion side pole II low side converter, the high-end converter wiring of pole I (C04), winding diagram as shown in figure 33.

Bipolar low side converter wiring (C05), winding diagram as shown in figure 34.

The high-end converter of inverter side, rectification side pole II low side converter, the high-end converter wiring of pole I (C06), winding diagram as shown in figure 35.

The high-end converter of rectification side pole I, pole II low side converter, inversion side pole I low side converter, the high-end converter wiring of pole II (C07), winding diagram as shown in figure 36.

Rectification side low side converter, the high-end converter wiring of inverter side (C08), winding diagram as shown in figure 37.

Rectification side low side converter, inversion side pole I low side converter, the high-end converter wiring of pole II (C09), winding diagram as shown in figure 38.

The high-end converter of rectification side, inversion side pole II low side converter, the high-end converter wiring of pole I (C10), winding diagram as shown in figure 39.

The high-end converter of rectification side, inverter side low side converter wiring (C11), winding diagram as shown in figure 40.

Rectification side pole I low side converter, the high-end converter of pole II, the high-end converter of inversion side pole I, pole II low side converter wiring (C12), winding diagram as shown in figure 41.

Inverter side low side converter, rectification side pole I low side converter, the high-end converter wiring of pole II (C13), winding diagram as shown in figure 42.

Bipolar high-end converter wiring (C14), winding diagram as shown in figure 43.

The high-end converter of rectification side, inversion side pole I low side converter, the high-end converter wiring of pole II (C15), winding diagram as shown in figure 44.

The high-end converter of inverter side, rectification side pole I low side converter, the high-end converter wiring of pole II (C16), winding diagram as shown in figure 45.

Rectification side pole 1 low side converter, the high-end converter in pole 2, inversion side pole 1 low side converter, the high-end converter wiring in pole 2 (C17), winding diagram as shown in figure 46.

In the bipolar single converter mode of connection, Figure 34 is the basic mode of connection of bipolar single converter, and Figure 31, Figure 32, Figure 33, Figure 35, Figure 36, Figure 37, Figure 38, Figure 39, Figure 40, Figure 41, Figure 42, Figure 43, Figure 44, Figure 45, Figure 46 are bipolar single converter improved cross connect mode.

The online switching of single converter is the distinctive a kind of mode of operation of extra-high voltage direct-current transmission engineering.The each current conversion station of extra-high voltage direct-current engineering has four converters, and each single converter can independent operating according to the single converter mode of connection.Under one pole double converter, bipolar uneven converter and the bipolar double converter mode of connection, can carry out online dropping into/exit the operation of single converter.

The ice-melt mode of connection only has one, and adopt I high-end converter in pole to be connected with the high-end converter parallel way of pole II, its winding diagram as shown in figure 47.

The flow process that the invention provides the adjustment method of one ± 800kV extra-high voltage direct-current transmission engineering system as shown in figure 48, comprises the steps:

L) collection of computational analysis data and arrangement: generate the every data file for DC transmission engineering system debug computational analysis;

2) computational analysis of system debug operational mode: for operation level year during system debug, the various typical operation modes should considered and adopt when research and proposition DC transmission engineering system debug and trend distribution thereof;

3) computational analysis of system debug project: do computational analysis to intending the system debug project of carrying out, can understand the impact of debug-item on system cloud gray model and device security, for the determination of DC transmission engineering system debug project provides technical basis;

4) the safety and stability computational analysis under system debug mode and accident prevention Study on Measures: for the various typical operation modes intending during DC transmission engineering system debug considering, by safety and stability computational analysis, find out the weak link and accident potential that exist in DC transmission engineering system; And from security and stability when guaranteeing system debug, study every safety and stability measure and cooperation thereof, work up the safety and stability measure scheme that each debug-item should be equipped with;

5) electromagnetic transient overvoltage calculates

Computed-torque control:

The overvoltage that ac bus single-phase earthing causes;

The overvoltage that converter valve pulse-losing causes;

The overvoltage that DC line fault causes;

Current conversion station DC side is stopped transport the overvoltage caused;

The overvoltage that Inverter Station load rejection causes;

The overvoltage that the online switching of single converter causes;

One pole the earth metallic return changes the overvoltage caused.

Result of calculation:

A) when in current conversion station both sides AC system generation single-phase earthing situation, overvoltage level and the lightning arrester energy consumption of equipment should in tolerance intervals.

B), under converter valve loses 100ms trigger impulse situation continuously, the overvoltage level of all devices should in allowed band, and all lightning arrester energy consumptions should in tolerance interval.

C), under DC line occurring one-phase short-circuit current situation, all lightning arrester energy consumptions all should in tolerance interval, and the overvoltage level of all devices is in allowed band;

D), when direct-current emergency is stopped transport, all lightning arrester energy consumptions all should in tolerance interval, and the overvoltage level of all devices is in allowed band;

E) Inverter Station occurs when getting rid of whole AC load in DC transmission system, overvoltage and the lightning arrester energy consumption of all devices all should in allowed bands;

F) Overvoltage Amplitude produced in one pole the earth metallic return transfer process and the energy consumption of lightning arrester all should be in allowed limits.

G) single converter drop into online/process out of service in the overvoltage that produces in allowed limits, another converter can not be caused normally to run.

Single converter basic mode of connection system debug project:

1) starting under greatly/metal connection mode/stoppage in transit test: confirm that system start/stoppage in transit function is normal, to ensure that the safety of system test is carried out.

2) trip protection test: confirm that system protection trip operation is normal, to ensure the safety of system and equipment.

3) steady-state behaviour and operation, control model test: confirm that various operation, the function of control model and conversion thereof are normal.

4) direct current mode of connection conversion: the functions such as monopolar ground return/metallic return conversion are tested.

5) controller parameter Optimum Experiment: the method tested by step, is tested to controller parameter.

6) Reactive Power Control test: whether inspection current conversion station Reactive Power Control performance meets code requirement.

7) trigger impulse/commutation failure test lost by converter: the performance of noiseproof of inspection DC control and protection system, sees and whether meets code requirement.

8) single converter runs DC line fault test: inspection DC line protection performance, fault restart order and FLU Fault Location Unit precision, see and whether meet code requirement.As DC line be short-circuited earth fault time, by DC line protection and DC line longitudinal difference protection detection failure, DC line protection is correct, warm boot success.

9) loss of auxiliary power, redundance unit and liaison test: confirm that the functions such as the action of these devices and equipment and switching all should be normal, for the high-power test of direct current system is got ready.

10) relevant with direct current system power modulation function test: check the grading, lifting of direct current power to fall function and DC power modulation to the effect strengthening system damping with returning.

11) rated power steady-state behaviour and operation, control model transfer test: confirm when transmitting high-power, function and the conversion thereof of various operation, control model are normal.

Comprise: the direct current mode of connection is changed: test functions such as single converter Ground return/metallic return conversions; Converter transformer shunting switch Control experiment.

12) rated power and overload trial: test equipment temperature rise, checks the through-current capability of whole direct current system.The test such as earth electrode test, harmonic wave, noise and radio interference also can be arranged in now to be carried out.

13) Reactive Power Control test: whether inspection current conversion station Reactive Power Control performance meets code requirement.

Single converter cross-connection system system debug project:

The debugging plan of described one pole double converter system comprises:

The major loop mode of connection of bipolar DC system is divided into the bipolar double converter mode of connection, two uneven converter wiring mode and the bipolar single converter mode of connection;

The debugging plan of bipolar DC system comprises: the debugging plan of the bipolar double converter mode of connection, the debugging plan of two uneven converter wiring mode and the debugging plan of the bipolar single converter mode of connection.

The debugging plan of the bipolar double converter mode of connection comprises:

1. bipolar double converter direct current system plays/stops test:

2. pole tripping operation, power transfer is tested:

3. power Control experiment:

4. brownout operation test:

Whether normal for verifying bipolar brownout operation controlling functions;

6. alternating current circuit Test to Failure:

7. Reactive Power Control test:

9. rated power and overload trial:

The debugging plan of two uneven converter wiring mode comprises:

One) bipolar uneven converter direct current system plays/stops test:

Two) pole tripping operation, power transfer is tested:

Three) power Control experiment:

Four) Reactive Power Control test:

The debugging plan of the bipolar single converter mode of connection comprises:

I, bipolar single converter direct current system play/stop test:

Ii, pole tripping operation, power transfer is tested:

Iii, power Control experiment:

(3) formulation ± 800kV extra-high voltage direct-current transmission engineering system debugging plan:

According to the on-the-spot current conversion station of DC engineering once with the concrete condition of secondary device performance, combine with computational analysis, and fully understand the feature of engineering and grasp on-the-spot actual conditions, according to engineering Minute stage construction, formulate engineering system debugging plan stage by stage.System commissioning test program is divided into system single converter system debug project, monopolar DC system to debug and bipolar DC system debug-item; Low-power test project and high-power test project is divided into from direct current transmission power level; low-power test project mainly examines the Control protection of direct current system and some other ilities, high-power test project mainly examine direct current system once with secondary device performance.

(4) right ± 800kV extra-high voltage direct-current transmission engineering system carry out field adjustable test:

Organize DC engineering fielded system debugging test; The tracking computational analysis of field adjustable pilot project; Debugging test result is analyzed; Solve the various technical problems occurred in test, evaluation is provided to DC transmission engineering Technical properties of plant.

(5) ± 800kV extra-high voltage direct-current transmission engineering system trial run:

After extra-high voltage direct-current engineering system has been debugged, owner is assisted to write direct current system trial run scheme, for owner provides direct current system to try technological service out, assist engineering owner to analyze trial run stage produced problem, solve produced problem between trial run period.

(6) ± 800kV extra-high voltage direct-current transmission engineering system debugging is summed up:

Field adjustable data is arranged, filed; Extra-high voltage direct-current transmission engineering system debug results is analyzed, concluded; System for writing and compiling debugging technique is reported, analyzes and researches to debug results and conclusion, provides extra-high voltage direct-current transmission engineering system debugging conclusion.

Below for Burner zone to Shanghai ± 800kV extra-high voltage direct-current transmission engineering, extra-high voltage direct-current transmission engineering system adjustment method is described.

Burner zone-Shanghai ± 800kV extra-high voltage direct-current transmission engineering is China's Article 1 ± 800kV ultra high voltage, high-capacity direct current power transmission engineering project.Burner zone-Shanghai ± specified transmission power of 800kV extra-high voltage direct-current transmission engineering is 6400MW, direct current rated direct voltage ± 800kV; Rated direct current 4000A.This project from the multiple imperial current conversion station near Yibin, Sichuan Province, by way of Sichuan, Chongqing, Hubei, Hunan, Anhui, Jiangsu, Zhejiang and Shanghai eight provinces and cities, to the east of the Fengxian current conversion station of suburb, Areas in Shanghai City, DC power transmission line total length 1907km.

The experience of the DC transmission engineering debugging such as Three Gorges-Changzhou, Three Gorges-Guangdong will be absorbed when formulating Burner zone-Shanghai extra-high voltage direct-current transmission engineering debug outline, and the feature of Burner zone of combining closely-Shanghai DC transmission engineering, to ensure satisfactorily completing of engineering debug work.

Concrete steps are as follows:

1. write Burner zone-Shanghai DC transmission engineering system debug outline:

According to DC transmission engineering direct current major loop, linear quadratic control proterctive equipment and alternating current equipment project organization and performance, determine the framework of the system debug item and techniques of DC transmission engineering; According to the frame content of system debug, use for reference the experience of DC transmission engineering system debug in the past, system for writing and compiling Commissioning programme, certainty annuity debugging milestone plan, carry out the preparation before system debug, collect the data of connecting system and engineering design technology specification and research report.

2. the technique preparation before system debug:

2.1 system safety stability analyses calculate

2.1.1 study condition

(1) research level year and networking mode

According to the latest developments situation of the upwards direct current construction that the ultra high voltage Ministry of Construction provides, estimated for the end of the year 2009, the debugging of one pole station will be completed, within 2010, will go into operation bipolar.Based on 2009 end of the year dispatching running way data that calculated data provides by Guo Tiao center, according to Electric Power Network Planning, construct the simulation calculation data of North China ~ Central China ~ East China Power Grid in 2010.

Northeast China Power Grid is connected with North China Power Telecommunication Network back-to-back by high ridge, and North China 1500MW is sent in northeast; Northwest Grid by Lingbao City's direct current, Lingbao City's second phase, the precious direct current of moral is connected with Central China Power Grid, Lingbao City's direct current is power transmission 1100MW altogether, and moral treasured direct current plan power transmission power is: the wet season send northwest 1500MW, dry season send Central China 3000MW.

North China and Central China Power Grid are connected by ultra high voltage Changzhi ~ Nanyang ~ Jingmen Flow Line that singly backcrosses.

Central China and East China by Ge Nan, Long Zheng, should be connected by China's 3 times direct currents, East China 7200MW is sent in Central China.

(2) operational mode and load level

According to electrical network practical operation situation in 2009, after considering that 110kV and following small power supply and regional load balance, determine North China in 2010, Central China, East China Power Grid Stability Numerical Analysis load level.

2010, North China Power Telecommunication Network calculated load was 113460MW, and Central China Power Grid calculated load is 109450MW, and East China Power Grid is 132350MW; Sichuan Electric Power Network is 14500MW, and Shanghai Power Network is 20310MW.

In calculating, the load level of waist mode and little mode calculated data is considered according to 75%, 50% of large mode respectively.

(3) stability Calculation main element model

1) generator excitation, speed governing, PSS model

Generator adopts detailed model, and consider the impact of excitation system, governing system, Key generating unit installs PSS device additional.Plan operation unit uses design parameter.

2) load model

Each component ratio of each network load model is as shown in table 1 below, and in load model, the stator leakage reactance of induction motor adopts 0.18pu.

Table 1 each electrical network computational analysis load model-look at table

(4) the fault clearance time

1) 500kV circuit three-phase permanent short fault: 0 second circuit generation three-phase permanent short fault, 0.09 second tripping fault side threephase switch, 0.1 second tripping offside threephase switch;

2) with bar stringing road N-2 fault altogether: 0 second circuit generation three-phase permanent short fault, 0.09 second tripping fault side threephase switch, 0.1 second tripping offside threephase switch, jumps another loop line simultaneously.

(5) stability criterion

Power system stability criterion is divided into angle stability, voltage stabilization, frequency stabilization three aspects.During computational analysis, if three can keep stable, then thinking system stability, if there is one can not stablize, then think that system is unstable, wherein when judging angle stability, if only the relative major network of indivedual little units loses synchronously, then still thinking system stability.Concrete criterion is as follows:

Angle stability: any two the unit relative angle swing curves after the system failure in same system are synchronous convergent oscillation;

Voltage stabilization: after fault clearance, the busbar voltage of main load-center substation can return to operation allowed band, and 500kV busbar voltage is no more than 1.0 seconds lower than the duration of 0.75p.u.;

Frequency stabilization: system frequency can return to rapidly near rated frequency and continue to run, not occurrence frequency collapse, the system frequency after accident can not long-term suspension in a certain too high or too low numerical value.

(6) computational tool

Adopt China Electric Power Research Institute PSD electric power system Software tool (PSDPowerTools) to complete, mainly contain:

1) PSD-BPA Load Flow Program

2) PSD-BPA transient stability program

2.1.2 research contents

According to upwards direct current debugging plan, and coordinate debugging power flow stability in conjunction with imperial political affairs, Jiang Cheng etc. operation direct current and analyze experience, the technical problem underlying faced in direct current debug system process has:

● the electric power tissue of the large load method of direct current and dissolving

● voltage control when direct current unlocks under little mode

● system safety during direct current high-power test and mode arrange (conveying capacity)

● need (temporarily) peace control means taked between limber up period

Estimate Central China, East China Power Grid load will more than 100,000,000 kilowatts, and Chongqing of Sichuan, Shanghai Power Network scale also more than 2,000 ten thousand kilowatts, will possess stronger power supply tissue and load digestion capability, direct current high-power test mode only arranges 2 ~ 6 hours.In general, select proper moment and fit system arrangement by two large regions electrical networks, electric power tissue can meet the demands, and principal contradiction will concentrate on network restriction and conveying capacity does not meet the demands.Because upwards the supporting power supply of direct current can not build up, this problem will become very outstanding, and this report mainly conducts a research to this.

2.1.3 result of calculation:

Burner zone-Shanghai ± 800kV extra-high voltage direct-current transmission demonstration project plan was built up in 2010 and is put into operation, but supporting 500kV rack and Burner zone Hydropower Unit all can not be gone into operation the same period, near region grid structure is weak, this brings certain difficulty to engineering system debugging, needs to be equipped with automatic safety device, reasonable arrangement operational mode.By computational analysis, draw the following conclusions and advise:

1), under Burner zone unit not operation condition, Burner zone current conversion station short circuit current is 10.9kA, capacity of short circuit is 9881MVA,

Effective short circuit ratio is 2.6; Nanhui current conversion station short circuit current is 50.4kA, and capacity of short circuit is 47640MVA, and effective short circuit ratio is 14.4.The debugging of extra-high voltage direct-current engineering system can be carried out, but will pay close attention to the voltage stability of sending.

2) the large load of one pole is upwards under direct current 3200MW mode, and multiple imperial current conversion station is multiple imperial change of current busbar voltage decline 7kV after excising one group of filter, and voltage change ratio is 1.36%; Smaller load is upwards under direct current 320MW mode, multiple imperial current conversion station after dropping into one group of filter multiple imperial change of current busbar voltage raise 10.2kV, voltage change ratio is close to 2%, and voltage fluctuation is comparatively large, needs to arouse attention.

3) closely, transmission distance is short, and level of stability is higher for Shanghai and East China major network electrical link, and one pole locking failure system occurs during ultra high voltage one pole high-power test can keep synchronism stability; But Shanghai receiving end line voltage is on the low side.For ensureing carrying out smoothly of high-power test, suggestion is arranged in waist mode and carries out; East China Power Grid should keep normal spinning reserve, improves electrical network and resists failures.

4) during carrying out upwards direct current one pole full-load test dry season, consider the factors such as electric power tissue, system stability level, reactive power/voltage control, power 1000MW is sent in suggestion UHVAC demonstration project arrangement south, Sichuan Electric Power Network, from the powered about 1500MW of Central China major network, arranges the precious direct current of moral to send Sichuan 1500MW.

5) during the wet season carries out upwards direct current one pole full-load test, control Chongqing of Sichuan section and send power outside within 3000MW, and avoid Chongqing of Sichuan section and E Yu section to liquidate mode as far as possible; For avoiding because security control device tripping causes UHVAC demonstration project off-the-line, can consider to arrange UHVAC demonstration project NORTEL south to send in short-term; The precious direct current of moral can arrange power transmission by trading program.

6) upwards during the full-load test of direct current one pole, mesa two units are completely sent out, and multiple imperial current conversion station drops into 9 groups of filter/capacitors.Research shows, the reactive voltage regulating measure of Sichuan Electric Power Network can meet the pressure regulation requirement of upwards direct current full-load test.

7) for ensureing carrying out smoothly of upwards direct current one pole full-load test, the peace control means that multiple imperial current conversion station near region need increase newly has:

● after direct current one pole locking fault, excise two beaches, Pubugou Project power station amounts to 4 ~ 5 units, parallel connection is cut Luzhou-multiple imperial sky and is filled circuit.

● after Great Gulch-Luzhou double loop N-1 fault, reduce fast upwards direct current power to below 2500MW.

● after Great Gulch-Luzhou double loop N-2 fault, locking is direct current upwards, and excises mesa unit.

● after Luzhou-multiple imperial three loop line N-2 faults, reduce fast upwards direct current power to below 2000MW.

2.2 electromagnetic transient overvoltages calculate

Computed-torque control:

DC side fault in <1> current conversion station, comprises in the middle part of current conversion station outlet and DC line and becomes to change of current change secondary side lead wire fault, height pressure valve Room high-pressure side centering busbar fault, the change of current overvoltage that secondary side single phase ground fault etc. causes to earth fault, height pressure valve Room high-pressure side to earth fault, height pressure valve Room high-pressure side.

<2> inverter side loses the overvoltage that trigger impulse causes.

<3> drops into alternating current filter and Capacitor banks overvoltage.

The transient recovery voltage of <4> alternating current filter and Capacitor banks breaker fracture.

Alternating current-direct current side overvoltage during <5> current conversion station interchange outlet earth fault.

<6> closes the ac bus overvoltage that converter transformer causes.

The overvoltage that the load rejection of <7> Inverter Station causes.

Result of calculation (for Burner zone-Shanghai ± 800kV ultra high voltage high voltage direct current transmission project):

(1), under DC bipolar operational mode, overvoltage during DC line mid point generation earth fault in DC line is the most serious, and the highest overvoltage appears in the middle part of non-faulting polar curve road along the line, and its amplitude is 1395kV; During consideration overhead line structures earth resistance, Overvoltage Amplitude decreases, and the Overvoltage Amplitude of corresponding 10 Ω earth resistances is 1359kV.

Except overvoltage in the middle part of DC line, current conversion station each point overvoltage level and lightning arrester energy consumption all with monopolar metallic return operational mode be short-circuited fault time even more serious.

(2) the bipolar or one pole emergency outage of direct current system, if Control protection can correct operation, namely bypass pair is thrown in rectification side shifting inversion side, then during converting plant emergency outage, current conversion station alternating current-direct current side, both sides each point is without obvious overvoltage, and lightning arrester is all not operating; During inverter side emergency outage, only Inverter Station neutral bus lightning arrestor movement, other each point of current conversion station alternating current-direct current side, both sides is all without obvious overvoltage, and corresponding lightning arrester is also not operating.

(3), under converter valve loses 100ms trigger impulse situation continuously, the overvoltage level of all devices is all in allowed band, and all lightning arrester energy consumptions are all in tolerance interval.

(4) inverter side does not throw bypass to very little on the impact of rectification side emergency outage, and can not produce obvious overvoltage in alternating current-direct current side, each lightning arrester also can not action.Inverter side does not throw bypass to larger on the impact of inverter side emergency outage.When inverter side does not throw bypass phase shift normal to rectification side, the outlet of inverter side direct current, valve top and neutral bus valve side all there will be higher overvoltage, and corresponding lightning arrester energy consumption is also very large.

(5) when dropping into alternating current filter and Capacitor banks, if phase selecting switching-on apparatus regular event, the impact that making process produces on filter or each element of Capacitor banks can be limited, and the disturbance of closing operation to system can be reduced, the lightning arrester in making process on each filter and Capacitor banks is all not operating.

(6) if phase selecting switching-on apparatus fails regular event, namely random combined floodgate mode is quite adopted to drop into filter or Capacitor banks, on the current conversion station 500kV bus of both sides, switching overvoltage is up to 1.54p.u. (p.u. is perunit value), and filter bus lightning arrester is all not operating; The relevant lightning arrestor movement of filter or Capacitor banks, but energy consumption level is all not high.

(7) normally run at direct current, under the different operating condition such as bipolar emergency outage, both sides current conversion station excision is large to be organized filter or excises in each group filter and Capacitor banks process respectively, the fracture transient recovery voltage maximum of circuit breaker is lower than 1500kV, and the fracture recovery voltage steepness maximum of circuit breaker is lower than 0.4kV/ μ s.

(8) as each filter and Capacitor banks all drop into, the steady-state current flowing through each large group of circuit breaker has all exceeded 700A(effective value), and the maximum capacitive electric current that 500kV AC circuit breaker can be cut-off at present is only 500A(effective value), therefore should not by organizing greatly breaker actuation surgical filtering device and Capacitor banks.

(9) direct current before unlocking multiple dragon or Fengxian current conversion station drop into one group of filter, current conversion station ac bus line voltage rises about 11kV or 3.5kV respectively.For ensureing that current conversion station ac bus voltage is no more than 550kV setting, before dropping into filter, multiple dragon or Fengxian current conversion station ac bus voltage should control at 535kV or below 540kV respectively.

During direct current monopolar operation, multiple dragon or Fengxian current conversion station drop into one group of filter, current conversion station ac bus line voltage rises about 6kV or 2.5kV respectively, for ensureing that current conversion station ac bus voltage is no more than 550kV setting, both sides current conversion station ac bus voltage should control at below 540kV.

(10) excise corresponding alternating current filter after direct current one pole or bipolar emergency outage 100ms, Fengxian current conversion station ac bus line voltage is lower than 550kV, and multiple imperial current conversion station ac bus line voltage will be regulated by sending end electrical network and be down to below 550kV.

(11) all there is not resonance overvoltage after exchanging outlet single-phase earthing and fault clearance in both sides current conversion station 500kV.The Overvoltage Amplitude that single phase ground fault causes on both sides 500kV change of current bus and lightning arrester energy consumption, multiple dragon is respectively 1.81p.u. and 1937kJ, and side, Fengxian is respectively 1.68p.u. and 66kJ.

Single phase ground fault is at multiple imperial current conversion station HP3 filter capacity C ₁and inductance L ₁the temporary overvoltage that two ends cause, than high during input coefficient, reaches 1024kV(2.28p.u. respectively) and 448kV(1.00p.u.); Numerical value in Overvoltage Amplitude on each element of other filter, Capacitor banks and their input processes is close or slightly high.

Current conversion station exchanges outlet single phase ground fault can produce the very high overvoltage of amplitude at converter valve two ends, multiple dragon is respectively 422kV and 378kV with side, Fengxian, and lightning arrester maximum energy consumption is respectively 3328kJ and 529kJ.

(12) do not occur obvious resonance overvoltage when multiple dragon and Fengxian current conversion station close converter transformer, current conversion station 500kV ac bus lightning arrester is all not operating.During direct current monopolar operation, large when dropping into the overvoltage and magnetizing inrush current Amplitude Ration DC bipolar block that an other pole converter transformer produces, but do not cause direct current normally to run pole commutation failure occurs.

2.3 system for writing and compiling debugging computational analysis reports

According to system-computed result, system for writing and compiling debugging computational analysis report, as the technical foundation of system for writing and compiling debugging plan and executive system debug-item.

3, the main contents of system commissioning test program: end-to-end system debugging is divided into single converter, one pole double converter system debug project and bipolar DC system to debug.

± 800kV extra-high voltage direct-current transmission engineering system debugging plan is divided into one pole single converter system commissioning test program, one pole double converter system commissioning test program and bipolar DC system debugging plan.When working out fielded system debugging embodiment, the system commissioning test program under the wiring operational mode of 3 types proposed and pilot project be considered above.Because all system debug pilot projects under the wiring operational mode of 3 types are more, so, when arranging fielded system debugging test, combination research will be optimized to pilot project, establishment fielded system debugging implementation plan.

3.1 single converter system debugs

3.1.1 single converter system debug project

(1) initial launch test, power just send/instead to send.Initial launch test comprises power and is just sending pilot project and anti-power delivery pilot project.

1) power is just sending pilot project to be:

Initialization operation test, Ground return runs.

Converter rises/stops, manual block.

Control system manual switchover.

Emergency outage is tested.

Analog input signal check:

Converter control, pole control and the signal check of bipolar control analog input;

The signal check of DC side protection analog input;

The signal check of AC protection analog input.

Initialization operation test, metallic return runs: repeat above content of the test.

2) anti-power delivery pilot project is:

Pole is risen/is stopped.

Emergency outage is tested.

Without communication, emergency outage is tested.

Analog input signal check.

The signal check of pole control analog input.

Initialization operation test, anti-power delivery, metallic return.

Repeat above pilot project.

The object of such test is just sending at power and under anti-condition of giving a present, carrying out converter starting/stoppage in transit, control system manual switchover, emergency outage, analog input signal check under the different mode of connection.In test it is important to note that: the polarity of check protection and definite value coordinate; Confirm emergency outage function, in case of emergency immediately by DC system locking, the person and device security can be ensured in debug process.This type of test can be carried out at low load.

(2) power just send, and trip protection is tested.Trip protection test comprises power and is just sending pilot project and anti-power delivery pilot project.

1) power is just sending pilot project to be:

There is communication, converting plant analog valve short trouble trip protection locking;

Have communication, converting plant simulation converter valve detects trip protection locking;

There is communication, converting plant simulation converter overcurrent protection tripping operation locking;

There is communication, converting plant simulation converter differential protection tripping operation locking;

Without communication, the locking of trigger impulse trip protection is lost in converting plant simulation;

Without communication, converting plant simulation wide-angle monitors trip protection locking;

There is communication, Inverter Station analog DC overvoltage protection tripping operation locking;

Have communication, Inverter Station simulation converter valve detects trip protection locking;

There is communication, Inverter Station simulation overcurrent protection tripping operation locking;

There is communication, Inverter Station simulation converter differential protection tripping operation locking;

Without communication, Inverter Station analog valve short-circuit protection tripping operation locking;

Without communication, Inverter Station simulation converter overcurrent protection tripping operation locking;

Rectification side valve cooling system fault starts tripping operation;

Inverter side valve cooling system fault starts tripping operation;

The object of trip protection test is under direct current power just gives condition a present; DC system protection function, sequential control function are verified; and by physical processes such as the energising of converter AC and power-off, converter deblocking and lockings; monitor with or without the operating condition of overvoltage, overcurrent phenomenon and surveillance equipment, verify the correctness of system start-stop process and the correctness of DC system protection function under various DC control pattern and operational mode.

(3) steady operation, power just send.

1) system monitoring function test project:

Effective system power failure;

Analog DC line fault (only in converting plant);

Simulation framework cpu fault and the test of detection host CPU load factor.

2) data/address bus fault.

3) control bus fault.

Object of this test is the requirement of the monitoring function whether content with funtion specifications of inspection direct current system.

(4) steady operation, associating Current Control, power just send.Steady operation, the test of associating Current Control comprises power and just send pilot project.

1) power is just sending pilot project to be:

Electric current lifting/lowering and stopping lifting/lowering;

In electric current lifting/lowering process, control system switches;

Master station/select from control station;

Change of current variation connects switch control rule, manually changes position of tapping switch;

Current-order step is tested;

Voltage instruction step;

Close the angle of rupture (γ) step;

Control model is changed, inverter control electric current and current-order step.

(5) normally run, joint Power controls, and power just send.Low-power is normally run, and joint Power Control experiment comprises power and just send pilot project.

1) power is just sending pilot project to be:

Converter starts/stops transport;

Power lifting/lowering;

In power lifting process, carry out systematic evaluation;

Power instruction step;

During communication failure, carry out the test of power lifting/lowering;

Patten transformation, inverter side controls electric current;

Be transformed into associating Current Control.

The performance that low-power steady operation, power are just sent, the object of joint Power Control experiment is inspection direct current system control system under power control mode, comprises the inspection of the control performances such as pole start-stop, power lifting, control system switching, control model conversion, dynamic performance and automatic trend reversion.

3) high-power operation, power just send, and joint Power Control experiment project is: pole is started, and pole power controlling run, change of current variation connects switch control rule, manual adjustments shunting switch.The object of this test is inspection pole start-stop, whether direct current system power lifting process when high-power operation has disturbance, is to primary equipment and the test of linear quadratic control proterctive equipment.

(6) low power run, power just send/instead to send, carry out separate current Control experiment during communication failure.Normal operation, power are just given, communication failure time carry out the test of independent Current Control and comprise power and just send pilot project.

1) power is just sending pilot project to be:

Converter starts/stops transport;

Emergency outage is tested;

Electric current lifting/lowering;

In slope process, carry out systematic evaluation;

Be transformed into and jointly control/power control.

Low power run, power just give, communication failure time carry out independent Current Control test object be the performance of inspection direct current system Control protection system under communication failure, separately current control mode, comprise the inspection of the Control protection performances such as pole start-stop, emergency outage, slope, control system switching, control model conversion.

(7) Reactive Power Control.Reactive Power Control test is divided into low-power test project and high-power test project.Low-power test project is checking Reactive Power Control performance.

1) low-power test project is:

Manual switching filter;

Filter requirements;

Filter switches;

Idle control;

Voltage control.

High-power test project is divided into again that power just send, Reactive Power Control and anti-power delivery, Reactive Power Control pilot project.To be checking direct current systems just to send and under anti-condition of giving a present at power for objects of these tests, the requirement of reactive power and alternating current filter switching order whether content with funtion specifications.

2) high-power test project is:

Reactive Power Control, Ground return;

Idle control, metallic return;

Idle control, metallic return, brownout operation;

Voltage control, Ground return;

Voltage control, metallic return;

Voltage control, metallic return, brownout operation.

3) Reactive Power Control, anti-power delivery (high-power test) pilot project is:

Ground return mode, Reactive Power Control;

Metallic return mode, Reactive Power Control;

Reactive Power Control, metallic return brownout operation.

(8) greatly/metallic return transfer test.Greatly/metallic return transfer test is divided into low-power test project and high-power test project.

The object of low-power test project is that checking direct current is transformed into metallic return from earth electrode and is transformed into earth electrode from metallic return; direct current system whether normal operation, and check metallic return change over switch (MRTB) and whether switching sequence operation is normal, whether the work of check valve protective loop is normal.

The object of high-power test project is except inspection metallic return change over switch (MRTB) and whether switching sequence operation normal, the work of check valve protective loop whether normal except, mainly check the ability of metallic return change over switch (MRTB) and oscillation circuit blocking direct current thereof, comprising: greatly/metallic return conversion (low-power); Greatly/metallic return conversion (middle power); Metallic return, Inverter Station utilizes Grounding operation test in station; Greatly/metallic return conversion (rated current or rated power).

(9) pulse-losing test, power just send/instead to send.Pulse-losing test, power just gives/instead send test to comprise power just to send pilot project and anti-power delivery pilot project.

1) power is just sending pilot project to be:

Ground return, inverter side loses individual pulse;

Ground return, inverter side loses multiple pulse (being greater than 5);

Metallic return, inverter side loses individual pulse;

Metallic return, inverter side loses multiple pulse (being greater than 5);

Metallic return, rectification side loses individual pulse;

Metallic return, rectification side loses multiple pulse (being greater than 5);

Metallic return, inverter side loses multiple pulse (being greater than 5), without communication;

Metallic return, rectification side loses multiple pulse (being greater than 5), without communication.

2) anti-power delivery pilot project is:

Ground return, inverter side loses individual pulse;

Ground return, inverter side loses multiple pulse (being greater than 5);

Metallic return, inverter side loses individual pulse;

Metallic return, inverter side loses multiple pulse (being greater than 5).

The object of test is the stability of access control system between trigger impulse age at failure, checks that direct current system contingency is in resonance or close in fundamental resonance situation, control can not amplify vibration.Simultaneously the continuous commutation failure protection of test valve and fundamental frequency, can second harmonic protection correct operation, and has checked whether that other protection misoperation trips, and after a commutation failure, whether direct current system meets demand of technical standard recovery time.

(10) upset test, power just send.Upset test, power are just sending pilot project to comprise:

DC line fault is tested.

Ground electrode circuit fault.

Exchange auxiliary electrical source exchange.

DC auxiliary supply fault:

Direct current system A110V/220V power failure;

Direct current system B110V/220V power failure;

Direct current system C110V/220V electrical source exchange.

The object of DC line fault test is inspection route protection sequential, observes temporary loss direct current power on the impact of AC system, simultaneously according to recovery time after technical specifications verification DC system fault, and verification DC line fault position indicator.

The object of simulation neutral bus Test to Failure is that inspection neutral bus protects whether correct operation, and monitoring neutral bus is with or without the operating condition of overvoltage, overcurrent phenomenon and surveillance equipment.

The object losing redundance unit test verifies that the switching of redundant element is steady, to direct current power transmission without large disturbance.

The object of ground electrode circuit Test to Failure is the performance of verification earth electrode pilot protection.

It should be noted that upwards extra-high voltage direct-current engineering design two ground electrode circuit protective functions, one is earth electrode impedance protection, its energy protective earthing pole total track length; Another is ground electrode circuit current imbalance protection (ground electrode circuit transverse differential protection), 1/2 ~ 2/3 of its energy protective earthing pole total track length.The object of ground electrode circuit Test to Failure is that can these two protections of inspection correct operation alarm.

The object of charged switching DC filter test is whether the charged switching DC filter of inspection has impact to direct current system operation.

(11) direct current system adds Control experiment.Direct current system is added Control experiment project and is comprised:

Power ascension and power return and fall test;

Simulate abnormal alternating voltage and FREQUENCY CONTROL;

Analog-modulated controls;

It is that inspection direct current system can change through-put power by the power definite value preset and elevation rate, to coordinate with system stability control equipment in the future that power ascension and power return the object of falling test.

The object of the alternating voltage that simulation is abnormal and frequency change Control experiment is that inspection direct current system transmission power can respond to the ANOMALOUS VARIATIONS of the voltage of AC system and frequency.This function can be utilized to the voltage suppressing AC system possible and frequency change.

The test of simulated power modulation function is whether inspection direct current system changes corresponding with the polarity that modulation signal changes to external modulation signal respond and direct current power.

(12) this locality/distant place controls operating operation test on conversion and standby face.This locality/distant place controls that conversion and standby face operate pilot project and comprises:

1) this locality/distant place controls transfer test:

A distant place controls/stops test;

A distant place controls the test of one pole power lifting/lowering.

2) operate on standby face:

Converter plays/stops test;

Single converter power lifting/lowering is tested.

The object of this test is that inspection distant place control (control centre) and face for subsequent use (PCP rack) operates pole start-stop, whether electric current (power) lifting is normal.

(13) hot operation test.Hot operation test and overload trial project comprise:

1) project measured will be carried out in hot operation test process:

Equivalent disturbing current (Ieq) detects;

AC harmonic (THFF) detects;

Radio interference is measured;

Audible noise measuring;

Auxiliary system of standing power loss is measured;

Earth electrode is tested.

2) power is the hot operation test of 1.00p.u, and Ground return, cooling for subsequent use does not put into operation.

3) tap changer control, Non-follow control tap changes.

4) power is the hot operation test of 1.00p.u, and metallic return, cooling for subsequent use does not put into operation.

5) power 1.10p.u running overload test.

3.1.2 single converter cross connect system debugging plan

(1) initial launch test, power just send.

Initialization operation test, Ground return runs.

Converter rises/stops, manual block.

Control system manual switchover.

Emergency outage is tested.

Analog input signal check:

The signal check of DC side protection analog input;

The signal check of AC protection analog input.

(2) initialization operation test, metallic return runs.

Repeat above content of the test.

The object of such test is under power just gives condition a present, carries out converter starting/stoppage in transit, control system manual switchover, emergency outage, analog input signal check under the different mode of connection.In test it is important to note that: the polarity of check protection and definite value coordinate; Confirm emergency outage function, in case of emergency immediately by DC system locking, the person and device security can be ensured in debug process.This type of test can be carried out at low load.

3.1.3 single converter system debug test event

In system debug, the main test event that need carry out has:

(1) test of direct current system running status amount.Whether the various operation conditions of checking direct current system meets code requirement.

(2) test of AC system running status amount.Under various direct current debugging working condition, to current conversion station AC critical quantity as alternating voltage, alternating current, meritorious and reactive power, frequency etc. are monitored, observe direct current system to the impact of AC system.

(3) overvoltage test, whether checking current conversion station and the design of DC line insulation coordination meet code requirement.

(4) alternating current-direct current stress_responsive genes, whether checking alternating current-direct current harmonic performance meets code requirement.

(5) noise and electromagnetic environmental impact test, whether verification environment impact meets code requirement.

(6) earth electrode test, whether the distribution of checking grounding electrode electric current, step voltage, touch voltage and earth electrode conductor temperature meet code requirement.

3.2 one pole double converter system debugs

3.2.1 one pole double converter system debug project

1) power is just sending pilot project to be:

Initialization operation test, Ground return runs.

One pole rises/stops, manual block.

Control system manual switchover.

Emergency outage is tested.

Analog input signal check:

The signal check of pole control analog input;

The signal check of DC side protection analog input;

The signal check of AC protection analog input.

2) anti-power delivery pilot project is:

Pole is risen/is stopped.

Emergency outage is tested.

Without communication, emergency outage is tested.

Analog input signal check.

The signal check of pole control analog input.

Initialization operation test, anti-power delivery, metallic return.

Repeat above pilot project.

The object of such test is just sending at power and under anti-condition of giving a present, carrying out pole starting/stoppage in transit, control system manual switchover, emergency outage, analog input signal check under the different mode of connection.In test it is important to note that: the polarity of check protection and definite value coordinate; Confirm emergency outage function, in case of emergency immediately by DC system locking, the person and device security can be ensured in debug process.This type of test can be carried out at low load.

(2) power just send, and trip protection is tested.

1) power is just sending pilot project to be:

There is communication, converting plant analog DC overvoltage protection tripping operation locking;

There is communication, converting plant ground electrode circuit protective tripping operation locking;

There is communication, converting plant analog DC pole bus differential protecting tripping operation Z locking;

Have communication, converting plant analog DC extreme difference moves trip protection locking;

Without communication, converting plant simulation alternating current-direct current short trip protection locking;

Without communication, converting plant analog DC extreme difference moves trip protection locking;

There is communication, Inverter Station analog DC harmonic protection tripping operation locking;

There is communication, Inverter Station simulation converter connecting line differential protection tripping operation locking;

Without communication, the trip protection locking of Inverter Station analogue ground polar curve road;

Without communication, Inverter Station analog DC pole bus differential protecting tripping operation locking;

There is communication, simulate high-end converter valve short-circuit protection, converting plant pole trip protection locking;

Have communication, converting plant simulation bypass to trip locking to overload protection;

Have communication, the locking of high-end converter bypass cock trip protection is simulated by converting plant;

Have communication, high-end converter differential protection is simulated by converting plant, pole trip protection locking;

(3) steady operation, power just send.

1) system monitoring function test project:

Effective system power failure;

Analog DC line fault (only in converting plant);

Simulation framework cpu fault and the test of detection host CPU load factor.

2) data/address bus fault.

3) control bus fault.

(4) steady operation, associating Current Control, power just send.

1) power is just sending pilot project to be:

Electric current lifting/lowering and stopping lifting/lowering;

In electric current lifting/lowering process, control system switches;

Master station/select from control station;

Current-order step is tested;

Voltage instruction step;

Close the angle of rupture (γ) step;

Above pilot project is carried out when low power run.In addition, this type of test also comprises following high-power test project.

1) power is just sending pilot project to be:

Pole is started/is stopped transport;

Power lifting/lowering;

In power lifting process, carry out systematic evaluation;

Power instruction step;

During communication failure, carry out the test of power lifting/lowering;

Patten transformation, inverter side controls electric current;

Be transformed into associating Current Control.

The performance that low-power steady operation, power are just sent, the object of joint Power Control experiment is inspection direct current system control system under power control mode, comprises the inspection of the control performances such as pole start-stop, power lifting, control system switching, control model conversion, dynamic performance.

3) high-power operation, power just send, and joint Power Control experiment project is: pole is started and pole power controlling run.The object of this test is inspection pole start-stop, whether direct current system power lifting process when high-power operation has disturbance, is to primary equipment and the test of linear quadratic control proterctive equipment.

(6) low power run, power just send, and carries out separate current Control experiment during communication failure.Normal operation, power are just given, communication failure time carry out the test of independent Current Control and comprise power and just send pilot project.

1) power is just sending pilot project to be:

Pole is started/is stopped transport;

Emergency outage is tested;

Electric current lifting/lowering;

In slope process, carry out systematic evaluation;

Be transformed into and jointly control/power control.

(7) low-power, normal voltage/brownout operation, power just send.

1) power is just sending pilot project to be:

Manually and protection starting drop test;

Power/current is elevated;

Sub-connecting switch of transformer controls, and manually changes position of tapping switch;

Power instruction step;

Communication failure;

Be transformed into associating Current Control;

Current-order step.

The reason of design DC decompression operation function runs to continue in DC line insulator contamination situation.Brownout operation can be controlled by DC line fault processing sequence or by operations staff's manual starting.

Low-power is just sent; the object of normal voltage/brownout operation test is the performance of inspection direct current system Control protection system under brownout operation mode, comprises the inspection that manual starting and protection starting step-down, change of current variation connect the Control protection performances such as switch control rule, direct current power/slope, control model conversion, communication failure disturbance and dynamic performance.

3) high-power operation, total head/brownout operation, power is just sending pilot project to be: manually and protection starting drop test.

Power just send; the object of normal voltage/brownout operation test is that direct current system is when high-power operation; check manual starting and protection starting step-down Control protection performance and system with very high speed step-down to the impact of primary equipment, with or without occurring overvoltage and overcurrent phenomenon.

Brownout operation test should be able to have between communication with station between station to be carried out without under the two kinds of modes that communicate.

(8) Reactive Power Control.Reactive Power Control test is divided into low-power test project and high-power test project.Low-power test project is checking Reactive Power Control performance.

1) low-power test project is:

Filter requirements;

Filter switches;

Idle control;

Voltage control.

High-power test project is divided into again that power just send, Reactive Power Control pilot project.Objects of these tests be checking direct current system under power just gives condition a present, the requirement of reactive power and alternating current filter switching order whether content with funtion specifications.

2) high-power test project is:

Reactive Power Control, Ground return;

Idle control, metallic return;

Idle control, metallic return, brownout operation;

Voltage control, Ground return;

Voltage control, metallic return;

Voltage control, metallic return, brownout operation.

(9) pulse-losing test, power just send.

1) power is just sending pilot project to be:

Ground return, inverter side loses individual pulse;

Ground return, inverter side loses multiple pulse (being greater than 5);

Metallic return, inverter side loses individual pulse;

Metallic return, inverter side loses multiple pulse (being greater than 5);

Metallic return, rectification side loses individual pulse;

(10) upset test, power just send.

DC line fault is tested.

Exchange auxiliary electrical source exchange.

DC filter switching.

DC auxiliary supply fault:

Direct current system A110V/220V power failure;

Direct current system B110V/220V power failure;

Direct current system C110V/220V electrical source exchange is tested.

Power ascension and power return and fall test;

Simulate abnormal alternating voltage and FREQUENCY CONTROL;

Analog-modulated controls;

1) this locality/distant place controls transfer test:

A distant place controls/stops test;

A distant place controls the test of one pole power lifting/lowering.

2) operate on standby face:

Rise/stop test;

One pole power lifting/lowering is tested.

(13) hot operation test.Hot operation test and overload trial project comprise:

1) project measured will be carried out in hot operation test process:

Equivalent disturbing current (Ieq) detects;

AC harmonic (THFF) detects;

Radio interference is measured;

Audible noise measuring;

Auxiliary system of standing power loss is measured;

3) power is the hot operation test of 1.00p.u, and metallic return, cooling for subsequent use does not put into operation.

3.2.2 monopolar DC system debugging test event

In system debug, the main test event that need carry out has:

3.3 bipolar DC system debugging

Before carrying out bipolar low power system test, the two corresponding single converters in station and one pole test should complete all.

3.3.1 bipolar double converter system debug project

(1) initialization runs, and power just send/instead to send.Initialization runs, and power just send/instead send test to comprise following pilot project:

Bipolarly rise simultaneously/stop, manual block, power just send;

Rectification side manual emergency is stopped transport, and power just send;

Inverter side manual emergency is stopped transport, and power just send;

Bipolarly rise simultaneously/stop, manual block, anti-power delivery;

Rectification side manual emergency is stopped transport, anti-power delivery;

Inverter side manual emergency is stopped transport, anti-power delivery.

The function of the starting of checking Bipolar DC power system and stoppage in transit and protection act stoppage in transit.

Object of this test is normal and without verifying the start-stop function that direct current system is basic during communication, and direct current system sequential control function is verified, check emergency outage function, in case of emergency immediately by DC system locking, the person and device security can be ensured in debug process.

This test is carried out in bipolar low power run situation.

(2) pole compensates, and ownership shifts, and power just send.This test is mainly verified and can normally be risen/stop and stable operation under electric current, power control mode with or without direct current system when communicating, the performances such as pole power back-off, extremely charged and grounding electrode electric current balance.

This project together can verify grounding electrode electric current balance quality in (5).

(3) automatic/hand controls, and power just send.Non-follow control direct current power lifting test is that under checking DC bipolar operational mode, can direct current power and electric current complete power, slope according to presetting power, current ration and rate of change.

The object of automatic control direct current power lifting test is that under inspection DC bipolar operational mode, can direct current power and electric current change according to the changed power curve preset (comprising preset value and rate of change).

This pilot project, except carrying out under bipolar low power run, is also carried out under bipolar high-power operational mode.Whether checking power lifting process and steady operation have disturbance, are also the examinations to secondary device control performance and primary equipment performance.

When testing, the lifting of Non-follow control power completes in other test, so only automatically control direct current power lifting test in the test of this project, consider that the performance of DC control system is mainly verified in this test, so can consider only to carry out this test under bipolar low power run mode.

(4) pole tripping operation, power back-off, power just send.This test had both comprised bipolar low-power test and had also comprised bipolar high-power test project, the object of test is the steady operation of checking DC bipolar, an one pole emergency outage, direct current power should transfer to an other pole, and the power transfer time should meet the 80ms of demand of technical standard.

Consider that the performance of DC control system is mainly verified in this test, so can consider only to carry out this test under bipolar low power run mode.

(5) earth electrode balance.The object of this test checks direct current system exactly under bipolar operational mode, and grounding electrode electric current should be less than 40A, checks in direct current system under bipolar operational mode simultaneously, and whether two stations utilize the interior Grounding start-stop in station and run normal.This test comprises following pilot project: earth electrode balance test; Converting plant and Inverter Station utilize Grounding start-stop test in station.

Earth electrode balance test completes together with (2).

According to converting plant and the DC fields switchgear distribution of Inverter Station and the configuring condition of earth electrode, ground switch earthing can be utilized in current conversion station between earth electrode turn(a)round to keep bipolar steady operation.

(6) brownout operation, power just send.This test had both comprised bipolar low-power test and had also comprised bipolar high-power test project, and the object of test is mainly run to continue in DC line insulator contamination situation.Brownout operation can by protection starting or by operations staff's manual starting.

Brownout operation test checks bipolar brownout operation characteristic.When direct current system is under brownout operation controls, during direct voltage instruction lifting, check reactive power or alternating voltage control action situation.

The high-power operation of direct current system, brownout operation pilot project is as follows: pole 1 brownout operation; Pole 2 brownout operation.

Whether the Control protection performance of bipolar low-power brownout operation main test direct current system meets the requirement of technical specifications.Bipolar high-power brownout operation, main checking secondary device control performance and primary equipment performance, verification exchanges the switching order of reactive-load compensation equipment, and examination one pole brownout operation, another pole overload characteristic.

(7) upset test, power just send.

Rectification side ground electrode circuit fault;

Inverter side ground electrode circuit fault;

Analogue ground pole open lines, pole trip test;

Alternating current circuit fault.

Ground electrode circuit is opened a way, pole trip test main test two functions, and one is the bipolar operation of direct current system, and analog DC ground electrode circuit is opened a way, and in standing, earthed switch NBGS can correctly close; Two is in station under earthed switch NBGS ground state, bipolar starting, and simulation one pole fault trip, also trips in another pole thereupon.

After the object of alternating current circuit earth fault test is mainly verified and broken down, the response condition of DC control and protection system, can direct current transmission power recover reposefully in official hour.When can examine fault in ac transmission system simultaneously, AC system relaying protection performance, the operation stability of whole ac and dc systems after understanding AC system breaks down.

(8) direct current system adds Control experiment.Bipolar operation, power just send, and it is as follows that direct current system adds Control experiment project:

Power ascension/power returns and falls;

Simulation AC system exception FREQUENCY CONTROL;

(simulated power modulation control) modulus signal additional control function is tested.

Bipolar operation, the object that direct current system adds Control experiment is identical with during direct current system monopolar operation, the difference of just monopolar operation and bipolar operation.

(9) this locality/far-end controls conversion and the operating operation test of standby face, and power just send.

1) this locality/distant place controls transfer test:

Rise/stop test;

Bipolar power lifting/lowering is tested.

2) operate on standby face:

Rise/stop test;

Bipolar power lifting/lowering is tested.

Bipolar operation, it is identical with during direct current system monopolar operation with the object of standby face operating operation test that this locality/distant place controls conversion, the difference of just monopolar operation and bipolar operation.

(10) Reactive Power Control.Bipolar operation, power just send, and Reactive Power Control pilot project is as follows:

1) power just send, Reactive Power Control:

Q-pattern;

U-pattern.

Test objective checks direct current system under high-power ruuning situation, the switching order of the performance that reactive power and voltage control control and filter.By high-power test, demonstrate Reactive Power Control performance.

(11) the hot operation test of rated power.

1) project measured will be carried out in hot operation test process:

I _eqcheck;

THFF checks;

Interferometry;

Audible noise checks;

To stand auxiliary apparatus power loss measurement.

2) hot operation test:

Bipolar heat is run;

Bipolar 1.0p.u. rated load operation test;

Reactive Power Control is tested.

3) brownout operation, hot operation test.

Check the ability to transmit electricity of equipment under the hot running status of bipolar rated power, comprise direct current conveying rated load, brownout operation and direct current system capability of overload.

It is longer that this test maintains large duration of load application, and the temperature rise of test equipment, checks the through-current capability of whole direct current system; Check the Steady-state Parameters (Ud, Id, Pd, Q, α, β, the change of current become tap position, alternating current filter input group number etc.) of whole direct current system, the temperature of test valve cooling water, capital equipment and bus contact joint, should carry out alternating current-direct current harmonic measure at this duration of test simultaneously simultaneously; Audible noise measuring, test of electromagnetic disturbance.It is checked whether to meet code requirement.

Before and after hot operation test, the oil in reply change of current change, smoothing reactor (oil immersed type) and sleeve pipe (oil-filled type) thereof carries out chromatography, the change of the gas contents such as monitoring acetylene.

3.3.2 bipolar uneven inverter system debug-item

Bipolarly rise simultaneously/stop, manual block, power just send;

Rectification side manual emergency is stopped transport, and power just send;

Inverter side manual emergency is stopped transport, and power just send;

Bipolarly rise simultaneously/stop, manual block, anti-power delivery;

Rectification side manual emergency is stopped transport, anti-power delivery;

Inverter side manual emergency is stopped transport, anti-power delivery.

This test is carried out in bipolar low power run situation.

(2) pole compensates, and ownership shifts, and power just send.This test is mainly verified and can normally be risen/stop and stable operation under electric current, power control mode and with or without direct current system during communication, the performances such as pole power back-off, extremely charged and grounding electrode electric current balance.

(3) pole tripping operation, power back-off, power just send.This test comprises bipolar low-power test pilot project, and the object of test is the steady operation of checking DC bipolar, an one pole emergency outage, and direct current power should transfer to an other pole, and the power transfer time should meet the 80ms of demand of technical standard.

(4) earth electrode balance.The object of this test checks direct current system exactly under bipolar operational mode, and grounding electrode electric current should be less than 40A, checks in direct current system under bipolar operational mode simultaneously, and whether two stations utilize the interior Grounding start-stop in station and run normal.This test comprises following pilot project: earth electrode balance test; Converting plant and Inverter Station utilize Grounding start-stop test in station.

(5) direct current system adds Control experiment.Bipolar operation, power just send, and it is as follows that direct current system adds Control experiment project:

Power ascension/power returns and falls;

3.3.3 bipolar single converter system debug project

Bipolarly rise simultaneously/stop, manual block, power just send;

Rectification side manual emergency is stopped transport, and power just send;

Inverter side manual emergency is stopped transport, and power just send;

Bipolarly rise simultaneously/stop, manual block, anti-power delivery;

Rectification side manual emergency is stopped transport, anti-power delivery;

Inverter side manual emergency is stopped transport, anti-power delivery.

This test is carried out in bipolar low power run situation.

(3) pole tripping operation, power back-off, power just send.This test comprises bipolar low-power test, and the object of test is the steady operation of checking DC bipolar, an one pole emergency outage, and direct current power should transfer to an other pole, and the power transfer time should meet the 80ms of demand of technical standard.

(5) upset test, power just send.Power is just sending pilot project as follows:

Rectification side ground electrode circuit fault;

Inverter side ground electrode circuit fault;

Alternating current circuit fault.

(6) direct current system adds Control experiment.Bipolar operation, power just send, and it is as follows that direct current system adds Control experiment project:

Power ascension/power returns and falls;

Simulation AC system exception FREQUENCY CONTROL;

(7) this locality/far-end controls conversion and the operating operation test of standby face, and power just send.A this locality/distant place control conversion and standby face operating operation test project as follows:

1) this locality/distant place controls transfer test:

Rise/stop test;

Bipolar power lifting/lowering is tested.

2) operate on standby face:

Rise/stop test;

Bipolar power lifting/lowering is tested.

(8) the hot operation test of rated power.

1) project measured will be carried out in hot operation test process:

I _eqcheck;

THFF checks;

Interferometry;

Audible noise checks;

To stand auxiliary apparatus power loss measurement.

2) hot operation test:

Bipolar single converter 1.0p.u. rated load operation test;

Reactive Power Control is tested.

3.3.4 bipolar DC system debugging test event

System debug test event can be carried out in conjunction with after said system debug-item or system debug.The main test event that need carry out has:

(1) test of direct current system running status amount, whether checking direct current system operation conditions meets code requirement.

(2) test of AC system running status amount, tests to the runnability of AC system.

(3) overvoltage test, whether the design of checking current conversion station insulation coordination meets code requirement.

(4) stress_responsive genes, whether checking harmonic performance meets code requirement.

(5) electromagnetic environment and noise testing, whether verifying electromagnetic environmental impact meets code requirement.

The online fling-cut system debugging of 3.4 single converter

The online fling-cut system debugging test of single converter, power just send.The object of test is the switching performance that checking checks single converter under bipolar operational mode, the bipolar uneven mode of connection and the one pole mode of connection, and on the impact that another pole is run; And whether the temporary overvoltage level produced meets demand of technical standard.

3.4.1 bipolar operation, single converter drops into/exits test

(1) bipolar operation, single converter excises/drops into test online

Bipolar operation, the test out of service of the high-end converter of rectification side pole 1;

Bipolar operation, the high-end converter commissioning test of rectification side pole 1;

Bipolar operation, the test out of service of the high-end converter of rectification side pole 2;

Bipolar operation, the high-end converter commissioning test of rectification side pole 2;

Bipolar operation, the test out of service of rectification side pole 1 low side converter;

Bipolar operation, rectification side pole 1 low side converter commissioning test;

Bipolar operation, the test out of service of rectification side pole 2 low side converter;

Bipolar operation, rectification side pole 2 low side converter commissioning test;

Bipolar operation, the test out of service of the high-end converter of inversion side pole 1;

Bipolar operation, the high-end converter commissioning test of inversion side pole 1;

Bipolar operation, the test out of service of the high-end converter of inversion side pole 2;

Bipolar operation, the high-end converter commissioning test of inversion side pole 2;

Bipolar operation, the test out of service of inversion side pole 1 low side converter;

Bipolar operation, inversion side pole 1 low side converter commissioning test;

Bipolar operation, the test out of service of inversion side pole 2 low side converter;

Bipolar operation, inversion side pole 2 low side converter commissioning test;

Bipolar operation, without communication, the test out of service of the high-end converter of rectification side pole 1;

Bipolar operation, without communication, the high-end converter commissioning test of rectification side pole 1;

Bipolar operation, without communication, the test out of service of the high-end converter of rectification side pole 2;

Bipolar operation, without communication, the high-end converter commissioning test of rectification side pole 2;

Bipolar operation, without communication, the test out of service of rectification side pole 1 low side converter;

Bipolar operation, without communication, rectification side pole 1 low side converter commissioning test;

Bipolar operation, without communication, the test out of service of rectification side pole 2 low side converter;

Bipolar operation, without communication, rectification side pole 2 low side converter commissioning test;

Bipolar operation, without communication, the test out of service of the high-end converter of inversion side pole 1;

Bipolar operation, without communication, inversion side pole 1 low side converter commissioning test;

Bipolar operation, without communication, the test out of service of the high-end converter of inversion side pole 2;

Bipolar operation, without communication, the high-end converter commissioning test of inversion side pole 2;

Bipolar operation, without communication, the test out of service of inversion side pole 1 low side converter;

Bipolar operation, without communication, the test out of service of inversion side pole 2 low side converter;

Bipolar operation, without communication, inversion side pole 2 is high-end, rectification side pole 2 low side converter commissioning test;

Bipolar operation, without communication, the high-end converter commissioning test of inversion side pole 2 low side, rectification side pole 2;

Bipolar operation, without communication, inversion side pole 1 is high-end, rectification side pole 1 low side converter commissioning test;

Bipolar operation, without communication, the high-end converter commissioning test of inversion side pole 1 low side, rectification side pole 1.

3.4.2 bipolar converter unbalanced operation, single converter excises/drops into test online

Bipolar operation, without communication, the high-end converter commissioning test of inversion side pole 1 low side, rectification side pole 1;

Bipolar operation, without communication, the high-end converter commissioning test of inversion side pole 2 low side, rectification side pole 2.

3.4.3 monopolar operation, single converter drops into/exits test

Monopolar operation, the test out of service of the high-end converter of inversion side pole 1;

Monopolar operation, the high-end converter commissioning test of rectification side pole 1;

Monopolar operation, the test out of service of inversion side pole 1 low side converter;

Monopolar operation, inversion side pole 1 low side converter commissioning test;

Monopolar operation, the test out of service of rectification side pole 1 low side converter;

Monopolar operation, rectification side pole 1 low side converter commissioning test;

Monopolar operation, the test out of service of the high-end converter of side pole 2;

Monopolar operation, the high-end converter commissioning test of inversion side pole 2.

3.4.4 single converter online fling-cut system debugging test event

3.5 ice-melt mode of connection system debugs

The ice-melt mode of connection is by high-end for pole I and pole II converter parallel running, direct current system adopts mixing multiterminal element control model, its objective is that inspection direct current system is under the ice-melt mode of connection, the function that direct current system controls and the performance of primary equipment and the switching performance of filter.Tested by the ice-melt mode of connection, the heat condition of checking DC line.

3.5.1 ice-melt mode of connection system debug project

Power just send, and the ice-melt mode of connection is tested, and direct current unblock/locking is tested;

Power just send, and the ice-melt mode of connection is tested, and control system switches;

Power just send, and the ice-melt mode of connection is tested, direct current lifting test.

4. fielded system debugging brief summary

4.1 system debug performances

Burner zone-Shanghai extra-high voltage direct-current system debug completes whole direct current system single converter, one pole and bipolar low-power and high-power test planning item 597, and all pilot projects all meet technical specifications requirement.

(1) overview

Burner zone-Shanghai ± 800kV extra-high voltage direct-current transmission demonstration project system debug is that China carries out extra-high voltage direct-current transmission engineering debug work first.Open the unified leadership of committee's meeting in engineering under, by extra-high voltage direct-current transmission engineering characteristic of combining closely, carry out scientific algorithm and l-G simulation test, careful formulation debugging plan, test plan and safety measure, and attend commissioning staff in body and work extra shifts or extra hours and work hard, on July 2nd, 2010 safe and efficient high-quality overfulfiled 46 kinds of modes of connection, 14 large classes, 597 pilot projects.

(1) pole 1 low side or high-end single converter pilot project 121;

(2) pole 2 low side or high-end single converter pilot project 98;

(3) pole 1 double converter pilot project 72;

(4) pole 2 double converter pilot project 53;

(5) bipolar double converter pilot project 54;

(6) AC and DC line fault pilot project 21;

(7) bipolar single converter pilot project 44;

(8) bipolar uneven pilot project 28;

(9) single converter interconnection pilot project 51;

(10) switching high and low end converter pilot project 37;

(11) distant place Control experiment project 4;

(12) the chain pilot project of switch 7 in string;

(13) ice-melt mode of connection pilot project 1.

(14) bipolar large load operation tests 6.

(2) system debug performance

According to the implementation plan of the approval of engineering startup confirmation committee, upwards engineering system debugging is divided into following three phases:

First stage: on February 23rd, 2010 was to March 5.This stage realizes on the basis of all fronts, pole 1 800 kv electriferous on December 26th, 2009, mainly complete and give pole 1 low side and the cross matching relevant to the high-end converter in pole, Fengxian 1 again, complete pilot project 75 altogether, achieve the target of pole 1 single converter to Shanghai power transmission.

Second stage: April 20 was to May 12.Mainly complete and give the test that the high-end converter of pole 2 low side and pole, Fengxian 2 drops into the rear various mode of connection again, finished item 147, achieves the target of bipolar single converter to Shanghai power transmission altogether.

Phase III: the phase III system debug from June 15 completes pilot project 369, be divided into two steps to carry out, the first step completes the system debug project 123 after the high-end converter input in pole 1, multiple dragon station from June 15 to June 20; Second step, from June 24 to July 2, completes the system debug project 238 after the high-end converter input in pole 2, multiple dragon station.So far, predetermined system debug project all completes.

Completion system is debugged bipolar rated power operation and is tested 6.

All debugging test results show above: the Control protection function of Bipolar DC power system all obtains checking, and all debug-items have met the requirement of engineering legislation book all, can drop into bipolar large load operation.

The present invention proposes ± 800kV extra-high voltage direct-current transmission engineering system debug-item first, and application is obtained in Burner zone-Shanghai ± 800kV extra-high voltage direct-current transmission engineering, ensure that system puts into operation on schedule, for extra-high voltage direct-current transmission engineering system debugging from now on provides experience and reference.

Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.

Claims

1. an adjustment method for ± 800kV extra-high voltage direct-current transmission engineering system, described ± 800kV extra-high voltage direct-current transmission engineering system comprises two ends current conversion station and DC power transmission line, and described two ends current conversion station is connected by DC power transmission line; Two ends current conversion station all adopts bipolar converter, and every pole converter comprises 12 pulse conversion devices of 2 series connection, and series voltage is connected by ± (400+400) kV;

It is ± 800kV that single-ended current conversion station direct current one pole normally runs direct voltage, and it is 400kV that single 12-pulse conversion device runs direct voltage;

The major loop mode of connection of ± 800kV extra-high voltage direct-current transmission engineering system comprises:

The <4> ice-melt mode of connection;

It is characterized in that, described method comprises the steps:

(6) ± 800kV extra-high voltage direct-current transmission engineering system debugging is summed up;

In described step (two), the major loop mode of connection according to single converter system, one pole double converter system, bipolar DC system and the online fling-cut system of single converter formulates described ± 800kV extra-high voltage direct-current transmission engineering system debugging plan, comprising:

The debugging plan of <1> single converter system;

The debugging plan of <2> one pole double converter system;

<3> bipolar DC system debugging plan;

<4> ice-melt mode of connection debugging plan;

In described <2>, the major loop mode of connection of one pole double converter system is divided into pole I and the pole II mode of connection;

The debugging plan of described one pole double converter system comprises:

H, loss of auxiliary power, redundance unit and liaison test: whether action and handoff functionality for confirming these devices and equipment be normal, for the high-power test of direct current system is got ready;

J, rated power steady-state behaviour and operation, control model transfer test: for confirming when transmitting high-power, whether function and the conversion thereof of various operation, control model be normal;

Comprise: the direct current mode of connection is changed: for testing monopolar ground return/metallic return translation function;

L, Reactive Power Control are tested: whether meet code requirement for checking current conversion station Reactive Power Control performance;

In described <3>, the major loop mode of connection of bipolar DC system is divided into the bipolar double converter mode of connection, two uneven converter wiring mode and the bipolar single converter mode of connection;

The debugging plan of described bipolar DC system comprises: the debugging plan of the bipolar double converter mode of connection, the debugging plan of two uneven converter wiring mode and the debugging plan of the bipolar single converter mode of connection;

The debugging plan of the described bipolar double converter mode of connection comprises:

1. bipolar double converter direct current system plays/stops test:

2. pole tripping operation, power transfer is tested:

3. power Control experiment:

4. brownout operation test:

Whether normal for verifying bipolar brownout operation controlling functions;

6. alternating current circuit Test to Failure:

7. Reactive Power Control test:

9. rated power and overload trial:

For the steady operation performance examining direct current to carry rated power, brownout operation, and various overladen ability; Alternating current-direct current harmonic wave, noise and radio interference are tested, checks whether and meet demand of technical standard;

The debugging plan of described two uneven converter wiring mode comprises:

One) bipolar uneven converter direct current system plays/stops test:

Two) pole tripping operation, power transfer is tested:

Three) power Control experiment:

Four) Reactive Power Control test:

I, bipolar single converter direct current system play/stop test:

Ii, pole tripping operation, power transfer is tested:

Iii, power Control experiment:

2. the adjustment method of as claimed in claim 1 ± 800kV extra-high voltage direct-current transmission engineering system, it is characterized in that, in described step (), described ± 800kV extra-high voltage direct-current transmission engineering system computational analysis comprises:

3. the adjustment method of as claimed in claim 2 ± 800kV extra-high voltage direct-current transmission engineering system, it is characterized in that, stop transport overvoltage that overvoltage that the overvoltage, the Inverter Station load rejection that cause cause, the online switching of single converter cause and one pole the earth metallic return of the overvoltage that the overvoltage that in described (5), electromagnetic transient overvoltage comprises overvoltage that ac bus single-phase earthing causes, converter valve pulse-losing causes, DC line fault cause, current conversion station DC side changes the overvoltage caused.

4. the adjustment method of as claimed in claim 2 ± 800kV extra-high voltage direct-current transmission engineering system, it is characterized in that, in described step (), the technical supervision of current conversion station subsystem is carried out at scene, understand content and the pilot project of the debugging of current conversion station subsystem, the result of the test of examination subsystem debugging and technical report, report subsystem technical supervision result to engineering owner.

5. the adjustment method of as claimed in claim 1 ± 800kV extra-high voltage direct-current transmission engineering system, it is characterized in that, in described <1>, the major loop mode of connection of one pole single converter is divided into the basic mode of connection and converter improved cross connect mode, and the basic mode of connection comprises: pole I low side converter wiring mode, pole I high-end converter wiring mode, pole II low side converter wiring mode and the high-end converter wiring mode of pole II; Improved cross connect mode comprises: rectification side pole I low side converter is connected with the high-end converter of inverter side, the high-end converter of rectification side pole I is connected with inverter side low side converter, rectification side pole II low side converter is connected with the high-end converter of inverter side and the high-end converter of rectification side pole I is connected with inverter side low side converter;

6. the adjustment method of as claimed in claim 5 ± 800kV extra-high voltage direct-current transmission engineering system, it is characterized in that, the debugging plan of the described basic mode of connection comprises:

6) Reactive Power Control test: whether meet code requirement for checking current conversion station Reactive Power Control performance;

7. the adjustment method of as claimed in claim 1 ± 800kV extra-high voltage direct-current transmission engineering system, is characterized in that, in described step (four), organize DC engineering system for field debugging test; The tracking computational analysis of field adjustable testing program; Debugging test result is analyzed, evaluation is provided to DC transmission engineering Technical properties of plant.

8. the adjustment method of as claimed in claim 1 ± 800kV extra-high voltage direct-current transmission engineering system, is characterized in that, in described step (six), arrange field adjustable data, file; Right ± 800kV extra-high voltage direct-current transmission engineering system debug results is analyzed, is concluded; Write ± 800kV extra-high voltage direct-current transmission engineering system debugging technique report, debug results and conclusion are analyzed and researched, provides system debug conclusion.