CN102790388A - Cascade multi-terminal extra-high voltage direct current simulation system and control protecting method thereof - Google Patents
Cascade multi-terminal extra-high voltage direct current simulation system and control protecting method thereof Download PDFInfo
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Abstract
The invention relates to a simulation system and a control protecting method thereof, which belong to the field of power systems and particularly relates to a cascade multi-terminal extra-high voltage direct current simulation system and a control protection method thereof. The simulation system comprises a primary simulation platform and a control protection system, wherein the primary simulation platform forms cascade multi-terminal extra-high voltage direct current by adopting digital/analogue mixing simulation equipment; the control protection system forms cascade multi-terminal extra-high voltage direct current power transmission on the basis of dual-terminal extra-high voltage direct current power transmission control protection; and the primary simulation platform is connected with the control protection system through an analogue quantity and digital quantity interface and comprises an alternating current system and a direct current system which are sequentially connected. According to the scheme provided by the invention, the simulation result has favorable credibility and reliability.
Description
Technical field
The present invention relates to a kind of analogue system and the control guard method thereof of field of power, be specifically related to a kind of cascade multiterminal extra-high voltage direct-current analogue system and control guard method thereof.
Background technology
MTDC transmission system comprises dual mode at present, and a kind of is parallel connection type multiterminal DC transmission systems, and a kind of is tandem type multiterminal DC transmission systems; The characteristics of parallel connection type MTDC transmission system are that direct voltage is a grade, and each holds the direct current can be inconsistent, have only end control direct voltage when normally moving, and all the other each ends are all controlled direct current; The characteristics of tandem type MTDC transmission system are respectively to hold direct current all to equate, each holds the direct voltage can be inconsistent, has only end control direct current when normally moving, and all the other each ends are all controlled direct voltage; And parallel connection type and series connection property multiterminal DC transmission system control protection research means all adopt digital simulation software to carry out.Cascade multiterminal extra-high voltage DC transmission system is a trend of MTDC transmission system research as a new notion.
Summary of the invention
To the deficiency of prior art, the present invention provides a kind of cascade multiterminal extra-high voltage direct-current analogue system and control guard method thereof, and this method adopts digital-to-analogue hybrid simulation equipment to form emulation platform of cascade multiterminal extra-high voltage direct-current; Utilize the control protection system of both-end extra-high voltage direct-current transmission to develop cascade multiterminal extra-high voltage direct-current transmission control protection system, and utilize the hybrid simulation platform to carry out cascade multiterminal extra-high voltage direct-current transmission control protection system steady-state characteristic and dynamic property research.
The objective of the invention is to adopt following technical proposals to realize:
A kind of cascade multiterminal extra-high voltage direct-current analogue system, its improvements are that said analogue system comprises:
Adopt digital-to-analogue hybrid simulation equipment to form an emulation platform of cascade multiterminal extra-high voltage direct-current;
Form the control protection system of cascade multiterminal extra-high voltage direct-current transmission based on both-end extra-high voltage direct-current transmission control protection;
A said emulation platform is connected with the control protection system through analog quantity and digital quantity interface;
A said emulation platform comprises AC system and the direct current system that connects successively.
Wherein, said AC system comprises Digital Simulation platform and amplifier; Said Digital Simulation platform is connected through cable with amplifier.
Wherein, said direct current system comprises converter transformer, converter valve, alternating current filter, DC filter, DC power transmission line and earth electrode circuit;
Said alternating current filter, converter transformer and converter valve are connected through cable successively;
Said converter valve is connected with the earth electrode circuit with DC power transmission line respectively through cable;
Said DC power transmission line, DC filter and earth electrode circuit are connected successively.
Wherein, adopt scaled transformer physical model to simulate said converter transformer; The valve plate that with the cmos element is core is simulated said converter valve; Adopt combine analog alternating current filter, DC filter, DC power transmission line and the earth electrode circuit of inductance, resistance, capacity cell.
Wherein, said control protection system comprises main frame and integrated circuit board, connects through optical fiber between said main frame and the integrated circuit board.
Wherein, said main frame comprises voltage regulator, current regulator, direct current controller, overvoltage limiter, calculating link and ALPHAMAX functional module.
Wherein, said control protection system comprises two kinds of control modes: direct current control and direct voltage control.
Wherein, in said direct current control, said ALPHAMAX functional module is connected with current regulator with voltage regulator respectively; Said voltage regulator is connected with current regulator; Said calculating link is connected with voltage regulator with overvoltage limiter respectively; Said direct current controller is connected with current regulator;
The control of said direct current comprises: the command value that draws trigger angle after the difference passing ratio integral element of direct current controller with the measured current of direct current system and direct current command value; Voltage regulator output is as the limits value of current regulator lower limit, and the output of ALPHAMAX functional module is as the current regulator higher limit.
Wherein, in said direct voltage control, said ALPHAMAX functional module is connected with voltage regulator; Said calculating link is connected with voltage regulator, overvoltage limiter and current regulator respectively; Said direct current controller is connected with current regulator;
The control of said direct voltage comprises: the command value that draws trigger angle after the difference passing ratio integral element of vertical compression current controller with the actual measurement voltage of direct current system and calculating voltage reference value; Voltage regulator output is as the limits value of the current regulator upper limit, and the output of ALPHAMAX functional module is as the voltage regulator higher limit.
The present invention is based on the control guard method of a kind of cascade multiterminal extra-high voltage direct-current analogue system that another purpose provides, its improvements are that said method comprises the steps:
(1) set up the direct current system steady state condition, the current ration that changes an emulation platform direct current system is realized the stable operation under the different capacity level of cascade multiterminal extra-high voltage direct-current system;
(2) change the alternating voltage parameter of an emulation platform AC system linking to each other with direct current system, draw the steady-state characteristic of cascade multiterminal extra-high voltage direct-current system through test;
(3) in an emulation platform AC system, carry out the earth fault test, the response characteristic and the recovery characteristics of checking cascade multiterminal extra-high voltage direct-current system;
(4) in cascade multiterminal extra-high voltage direct-current system, carry out the Test to Failure of DC line, the response characteristic and the recovery characteristics of checking cascade multiterminal extra-high voltage direct-current system;
(5) carry out step response test to the control protection system, the response characteristic of checking cascade multiterminal UHV transmission control protection system parameter; Said control protection system parameter comprises integral constant, gain and proportionality coefficient;
(6) in cascade multiterminal extra-high voltage direct-current system, carry out Test to Failure, the correctness of checking protection action, sensitivity, and reliability.
With the prior art ratio, the beneficial effect that the present invention reaches is:
1, cascade multiterminal extra-high voltage direct-current analogue system provided by the invention and control guard method thereof; The AC system of primary system emulation platform adopts ripe Digital Simulation System; Direct current system comprises that converter transformer and converter valve etc. adopt the very high physical model of emulation accuracy, and simulation result has good confidence level and reliability.
2, electrical secondary system is promptly controlled hardware and the software platform that protection system adopts practical engineering application; Its control characteristic and protection philosophy are all through the checking of actual dc engineering, and the operation characteristic of the multiterminal extra-high voltage direct-current control protection system that on this hardware and software platform, realizes has actual using value.
3, the used interface integrated circuit board characteristic of interface medium between primary system emulation platform and the electrical secondary system and actual engineering is consistent.
4, cascade multiterminal extra-high voltage direct-current transmission emulation mode is that the useful of existing direct current transportation system replenished, and has enriched existing direct current transportation system.
5, remedied the deficiency of both-end extra-high voltage DC transmission system, enlarged the range of application of DC transmission system, needed a large amount of electric power energies that a kind of new solution is provided for different location in the same area.
6, compare with existing parallel connection and tandem type multiterminal extra-high voltage DC transmission system, it can utilize the technology of existing both-end extra-high voltage DC transmission system, has remarkable advantages economically.
7, compare with the both-end extra-high voltage DC transmission system, required lowly to what hold AC network, AC network does not need further reinforcement promptly to be applicable to cascade multiterminal extra-high voltage DC transmission system.
Description of drawings
Fig. 1 is AC system part provided by the invention and connects sketch map;
Fig. 2 is direct current system part provided by the invention and connects sketch map;
Fig. 3 is control protection system part provided by the invention and connects sketch map;
Fig. 4 is a cascade multiterminal extra-high voltage direct-current transmission analogue system sketch map provided by the invention;
Fig. 5 is a cascade multiterminal extra-high voltage direct-current Current Control schematic diagram provided by the invention;
Fig. 6 is a cascade multiterminal extra-high voltage direct-current voltage control schematic diagram provided by the invention;
Fig. 7 is a direct current control flow chart provided by the invention;
Fig. 8 is a direct voltage control flow chart provided by the invention.
Embodiment
Do further to specify below in conjunction with the accompanying drawing specific embodiments of the invention.
Cascade multiterminal extra-high voltage direct-current transmission analogue system sketch map provided by the invention is as shown in Figure 4; This analogue system comprises: be the basis with national grid simulation centre digital-to-analogue hybrid simulation equipment, adopt digital-to-analogue hybrid simulation equipment to form an emulation platform of cascade multiterminal extra-high voltage direct-current; Form the control protection system of cascade multiterminal extra-high voltage direct-current transmission based on both-end extra-high voltage direct-current transmission control protection; One time emulation platform is connected with the control protection system through analog quantity and digital quantity interface; One time emulation platform comprises AC system and the direct current system that connects successively.
AC system comprises Digital Simulation platform and amplifier; The Digital Simulation platform is connected through cable with amplifier.AC system part and connect as shown in Figure 1.Converter transformer, converter valve, DC power transmission line, earth electrode circuit, alternating current filter and DC filter have been formed direct current system, and alternating current filter, converter transformer and converter valve are connected through cable successively; Converter valve is connected with the earth electrode circuit with DC power transmission line respectively through cable; DC power transmission line, DC filter and earth electrode circuit are connected successively.Wherein, Scaled transformer physical model simulation converter transformer; With the cmos element converter valve in the valve plate analog DC transmission of electricity of core, with combine analog alternating current filter, DC filter, DC power transmission line and the earth electrode circuit of inductance, resistance, capacity cell.Direct current system part and connect as shown in Figure 2.
Based on both-end extra-high voltage direct-current control protection electrical secondary system; Characteristics in conjunction with cascade multiterminal extra-high voltage DC transmission system; Formed the control protection system of cascade multiterminal extra-high voltage direct-current transmissions; The control protection system is made up of control protection main frame and corresponding integrated circuit board on hardware, on software, is made up of relevant control protection logic module, through being downloaded to after the related software compiling in the control protection main frame; Control protection system function is arranged in the control protection main frame, and main frame comprises voltage regulator, current regulator, direct current controller (also being called the current limiting low-voltage controller), overvoltage limiter, calculating link and ALPHAMAX functional module.Adopt optical fiber to be connected between integrated circuit board and the main frame, the composition of control protection system and connect as shown in Figure 3.
Through analog quantity and digital quantity Interface Terminal; The emulation platform of cascade multiterminal extra-high voltage DC transmission system and the control protection system of cascade multiterminal extra-high voltage direct-current transmission are connected to form the complete cascade multiterminal extra-high voltage direct-current transmission analogue system of a cover, and cascade extra-high voltage DC transmission system emulation sketch map is as shown in Figure 4.The steady-state characteristic and the dynamic Characteristic Simulation research of cascade multiterminal extra-high voltage direct-current control protection system have been carried out based on this analogue system.
Control protection system core is two kinds of Different control modes, i.e. direct current control and direct voltage control, its control principle figure such as Fig. 5 and shown in Figure 6.
In direct current control, the ALPHAMAX functional module is connected with current regulator with voltage regulator respectively; Voltage regulator is connected with current regulator; Calculating link is connected with voltage regulator with overvoltage limiter respectively; The direct current controller is connected with current regulator;
Direct current control comprises: the command value that draws trigger angle after the difference passing ratio integral element of direct current controller with the measured current of direct current system and direct current command value; Voltage regulator output is as the limits value of its lower limit; And the ALPHAMAX functional block is exported as its higher limit, and its flow chart is as shown in Figure 7.
In direct voltage control, the ALPHAMAX functional module is connected with voltage regulator; Calculating link is connected with voltage regulator, overvoltage limiter and current regulator respectively; The direct current controller is connected with current regulator;
Direct voltage control comprises: the command value that draws trigger angle after the difference passing ratio integral element of vertical compression current controller with the actual measurement voltage of direct current system and calculating voltage reference value; Voltage regulator output is as the limits value of the current regulator upper limit; And the ALPHAMAX functional block is exported as the voltage regulator higher limit, and its flow chart is as shown in Figure 8.
Based on cascade multiterminal extra-high voltage direct-current transmission analogue system provided by the invention, carried out the steady-state characteristic and the dynamic Characteristic Simulation research of cascade multiterminal extra-high voltage direct-current control protection system, and relevant control protection simulation study; Control protection simulation study may further comprise the steps:
(1) set up the direct current system steady state condition, the current ration that changes an emulation platform direct current system is realized the stable operation under the different capacity level of cascade multiterminal extra-high voltage direct-current system;
(2) change the alternating voltage parameter of an emulation platform AC system linking to each other with direct current system, draw the steady-state characteristic of cascade multiterminal extra-high voltage direct-current system through test;
(3) in an emulation platform AC system, carry out the earth fault test, the response characteristic and the recovery characteristics of checking cascade multiterminal extra-high voltage direct-current system;
(4) in cascade multiterminal extra-high voltage direct-current system, carry out the Test to Failure of DC line, the response characteristic and the recovery characteristics of checking cascade multiterminal extra-high voltage direct-current system;
(5) carry out step response test to the control protection system, the response characteristic of checking cascade multiterminal UHV transmission control protection system parameter; Said control protection system parameter comprises integral constant, gain and proportionality coefficient;
(6) in cascade multiterminal extra-high voltage direct-current system, carry out Test to Failure, the correctness of checking protection action, sensitivity, and reliability.
Cascade multiterminal extra-high voltage direct-current transmission analogue system provided by the invention and control guard method thereof; Be the basis with national grid simulation centre digital-to-analogue hybrid simulation equipment; Adopt digital generator analog AC system, scaled transformer physical model simulation converter transformer is the converter valve in the valve plate analog DC transmission of electricity of core with the cmos element; With the combine analog DC power transmission line and the earth electrode circuit of inductance, resistance, capacity cell, research has formed the partial simulation system one time; Based on both-end extra-high voltage direct-current control protection electrical secondary system; Characteristics in conjunction with cascade multiterminal extra-high voltage DC transmission system; Formed the control protection system of cascade multiterminal extra-high voltage direct-current transmissions; Based on cascade multiterminal extra-high voltage direct-current transmission analogue system, carried out the steady-state characteristic and the dynamic Characteristic Simulation research of cascade multiterminal extra-high voltage direct-current control protection system, the simulation result of analogue system has good confidence level and reliability.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although the present invention has been carried out detailed explanation with reference to the foregoing description; Under the those of ordinary skill in field be to be understood that: still can specific embodiments of the invention make amendment or be equal to replacement; And do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. cascade multiterminal extra-high voltage direct-current analogue system is characterized in that said analogue system comprises:
Adopt digital-to-analogue hybrid simulation equipment to form an emulation platform of cascade multiterminal extra-high voltage direct-current;
Form the control protection system of cascade multiterminal extra-high voltage direct-current transmission based on both-end extra-high voltage direct-current transmission control protection;
A said emulation platform is connected with the control protection system through analog quantity and digital quantity interface;
A said emulation platform comprises AC system and the direct current system that connects successively.
2. cascade multiterminal extra-high voltage direct-current analogue system as claimed in claim 1 is characterized in that said AC system comprises Digital Simulation platform and amplifier; Said Digital Simulation platform is connected through cable with amplifier.
3. cascade multiterminal extra-high voltage direct-current analogue system as claimed in claim 1 is characterized in that said direct current system comprises converter transformer, converter valve, alternating current filter, DC filter, DC power transmission line and earth electrode circuit;
Said alternating current filter, converter transformer and converter valve are connected through cable successively;
Said converter valve is connected with the earth electrode circuit with DC power transmission line respectively through cable;
Said DC power transmission line, DC filter and earth electrode circuit are connected successively.
4. cascade multiterminal extra-high voltage direct-current analogue system as claimed in claim 3 is characterized in that, adopts scaled transformer physical model to simulate said converter transformer; The valve plate that with the cmos element is core is simulated said converter valve; Adopt combine analog alternating current filter, DC filter, DC power transmission line and the earth electrode circuit of inductance, resistance, capacity cell.
5. cascade multiterminal extra-high voltage direct-current analogue system as claimed in claim 1 is characterized in that said control protection system comprises main frame and integrated circuit board, connects through optical fiber between said main frame and the integrated circuit board.
6. cascade multiterminal extra-high voltage direct-current analogue system as claimed in claim 5 is characterized in that said main frame comprises voltage regulator, current regulator, direct current controller, overvoltage limiter, calculating link and ALPHAMAX functional module.
7. cascade multiterminal extra-high voltage direct-current analogue system as claimed in claim 5 is characterized in that said control protection system comprises two kinds of control modes: direct current control and direct voltage control.
8. cascade multiterminal extra-high voltage direct-current analogue system as claimed in claim 7 is characterized in that, in said direct current control, said ALPHAMAX functional module is connected with current regulator with voltage regulator respectively; Said voltage regulator is connected with current regulator; Said calculating link is connected with voltage regulator with overvoltage limiter respectively; Said direct current controller is connected with current regulator;
The control of said direct current comprises: the command value that draws trigger angle after the difference passing ratio integral element of direct current controller with the measured current of direct current system and direct current command value; Voltage regulator output is as the limits value of current regulator lower limit, and the output of ALPHAMAX functional module is as the current regulator higher limit.
9. cascade multiterminal extra-high voltage direct-current analogue system as claimed in claim 6 is characterized in that, in said direct voltage control, said ALPHAMAX functional module is connected with voltage regulator; Said calculating link is connected with voltage regulator, overvoltage limiter and current regulator respectively; Said direct current controller is connected with current regulator;
The control of said direct voltage comprises: the command value that draws trigger angle after the difference passing ratio integral element of vertical compression current controller with the actual measurement voltage of direct current system and calculating voltage reference value; Voltage regulator output is as the limits value of the current regulator upper limit, and the output of ALPHAMAX functional module is as the voltage regulator higher limit.
10. the control guard method of a cascade multiterminal extra-high voltage direct-current analogue system is characterized in that said method comprises the steps:
(1) set up the direct current system steady state condition, the current ration that changes an emulation platform direct current system is realized the stable operation under the different capacity level of cascade multiterminal extra-high voltage direct-current system;
(2) change the alternating voltage parameter of an emulation platform AC system linking to each other with direct current system, draw the steady-state characteristic of cascade multiterminal extra-high voltage direct-current system through test;
(3) in an emulation platform AC system, carry out the earth fault test, the response characteristic and the recovery characteristics of checking cascade multiterminal extra-high voltage direct-current system;
(4) in cascade multiterminal extra-high voltage direct-current system, carry out the Test to Failure of DC line, the response characteristic and the recovery characteristics of checking cascade multiterminal extra-high voltage direct-current system;
(5) carry out step response test to the control protection system, the response characteristic of checking cascade multiterminal UHV transmission control protection system parameter; Said control protection system parameter comprises integral constant, gain and proportionality coefficient;
(6) in cascade multiterminal extra-high voltage direct-current system, carry out Test to Failure, the correctness of checking protection action, sensitivity, and reliability.
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| CN106249022A (en) * | 2016-07-08 | 2016-12-21 | 国网上海市电力公司 | The analysis system and method that DC control and protection system is affected by exchange transient voltage |
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| CN106249022B (en) * | 2016-07-08 | 2018-11-27 | 国网上海市电力公司 | The analysis system and method that exchange transient voltage influences DC control and protection system |
| CN107147140A (en) * | 2017-05-05 | 2017-09-08 | 南京南瑞继保电气有限公司 | A kind of DC transmission system power instruction deviation monitoring device and deviation monitoring method |
| CN107147140B (en) * | 2017-05-05 | 2019-09-27 | 南京南瑞继保电气有限公司 | A kind of DC transmission system power instruction deviation monitoring device and deviation monitoring method |
| CN109683583A (en) * | 2018-11-23 | 2019-04-26 | 国网安徽省电力有限公司电力科学研究院 | The test macro of converter valve protective device based on control protection decoupling |
| CN110460057A (en) * | 2019-08-13 | 2019-11-15 | 广西电网有限责任公司电力科学研究院 | A kind of numerical model analysis analogue system suitable for alternating current-direct current mixing power grid |
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