CN102790388B - 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 of field of power and control guard method, be specifically related to a kind of cascade multiterminal extra-high voltage direct-current analogue system and control guard method.
Background technology
MTDC transmission system comprises two kinds of modes at present, and a kind of is parallel connection type multi-terminal HVDC transmission system, and a kind of is tandem type multi-terminal HVDC transmission system; The feature of parallel connection type MTDC transmission system is that direct voltage is a grade, and each holds the direct current can be inconsistent, only has one end to control direct voltage while normally moving, and all the other each ends are all controlled direct current; The feature of tandem type MTDC transmission system is respectively to hold direct current all to equate, each holds the direct voltage can be inconsistent, only has one end to control direct current while normally moving, and all the other each ends are all controlled direct voltage; And parallel connection type and series connection property multi-terminal HVDC transmission system are controlled protection research means and are all adopted digital simulation software to carry out.Cascade multiterminal extra-high voltage DC transmission system, as a new concept, is a trend of MTDC transmission system research.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of cascade multiterminal extra-high voltage direct-current analogue system and control guard method, the 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 hybrid simulation platform to carry out cascade multiterminal extra-high voltage direct-current transmission and control protection system steady-state characteristic and dynamic property research.
The object of the invention is to adopt following technical proposals to realize:
A cascade multiterminal extra-high voltage direct-current analogue system, its improvements are, described analogue system comprises:
Adopt digital-to-analogue hybrid simulation equipment to form an emulation platform of cascade multiterminal extra-high voltage direct-current;
Based on both-end extra-high voltage direct-current transmission, control the control protection system that protection forms cascade multiterminal extra-high voltage direct-current transmission;
A described emulation platform is connected with control protection system by analog quantity and digital quantity interface;
A described emulation platform comprises AC system and the direct current system connecting successively.
Wherein, described AC system comprises Digital Simulation platform and amplifier; Described Digital Simulation platform is connected by cable with amplifier.
Wherein, described direct current system comprises converter transformer, converter valve, alternating current filter, DC filter, DC power transmission line and ground electrode circuit;
Described alternating current filter, converter transformer and converter valve are connected successively by cable;
Described converter valve is connected with ground electrode circuit with DC power transmission line respectively by cable;
Described DC power transmission line, DC filter and ground electrode circuit are connected successively.
Wherein, adopt scaled transformer physical model to simulate described converter transformer; The valve plate that the cmos element of take is core is simulated described converter valve; Adopt combine analog alternating current filter, DC filter, DC power transmission line and the ground electrode circuit of inductance, resistance, capacity cell.
Wherein, described control protection system comprises main frame and board, between described main frame and board, by optical fiber, connects.
Wherein, described main frame comprises voltage regulator, current regulator, direct current controller, overvoltage limiter, calculating link and ALPHAMAX functional module.
Wherein, described control protection system comprises two kinds of control modes: direct current is controlled and DC voltage control.
Wherein, in described direct current is controlled, described ALPHAMAX functional module is connected with current regulator with voltage regulator respectively; Described voltage regulator is connected with current regulator; Described calculating link is connected with voltage regulator with overvoltage limiter respectively; Described direct current controller is connected with current regulator;
Described direct current is controlled and is comprised: direct current controller will draw the command value of Trigger Angle after the difference passing ratio integral element of 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 current regulator higher limit.
Wherein, in described DC voltage control, described ALPHAMAX functional module is connected with voltage regulator; Described calculating link is connected with voltage regulator, overvoltage limiter and current regulator respectively; Described direct current controller is connected with current regulator;
Described DC voltage control comprises: vertical compression current controller will draw the command value of Trigger Angle after the difference passing ratio integral element of 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 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 object provides, its improvements are, described method comprises the steps:
(1) set up direct current system steady state condition, the current ration that changes an emulation platform direct current system is realized the stable operation under different capacity level of cascade multiterminal extra-high voltage direct-current system;
(2) change the AC voltage parameter of the emulation platform AC system being connected with direct current system, by test, draw the steady-state characteristic of cascade multiterminal extra-high voltage direct-current system;
(3) in an emulation platform AC system, carry out earth fault test, 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, response characteristic and the recovery characteristics of checking cascade multiterminal extra-high voltage direct-current system;
(5) for controlling protection system, carry out step response test, checking cascade multiterminal UHV transmission is controlled the response characteristic of protection system parameter; Described 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, correctness, sensitivity and the reliability of checking protection action.
Compared with the prior art, 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 simulation nicety, and simulation result has good confidence level and reliability.
2, electrical secondary system controls hardware and the software platform that protection system adopts practical engineering application; its control characteristic and protection philosophy are all by the checking of actual DC engineering, and the operation characteristic that the multiterminal extra-high voltage direct-current of realizing on this hardware and software platform is controlled protection system has actual using value.
3, the interface medium between primary system emulation platform and electrical secondary system and Practical Project interface board characteristic used is consistent.
4, cascade multiterminal extra-high voltage direct-current transmission emulation mode is that the useful of existing direct current transportation system supplemented, and has enriched existing direct current transportation system.
5, make up the deficiency of both-end extra-high voltage DC transmission system, expanded the range of application of DC transmission system, for different location in the same area, needed a large amount of electric power energies that a kind of new solution is provided.
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 economically obvious advantage.
7, compare with both-end extra-high voltage DC transmission system, to receiving end AC network require lowly, AC network does not need further reinforcement to be applicable to cascade multiterminal extra-high voltage DC transmission system.
Accompanying drawing explanation
Fig. 1 is AC system part provided by the invention and connection diagram;
Fig. 2 is direct current system part provided by the invention and connection diagram;
Fig. 3 is control protection system part provided by the invention and connection diagram;
Fig. 4 is cascade multiterminal extra-high voltage direct-current transmission analogue system schematic diagram provided by the invention;
Fig. 5 is cascade multiterminal extra-high voltage direct-current Current Control schematic diagram provided by the invention;
Fig. 6 is cascade multiterminal extra-high voltage direct-current voltage control schematic diagram provided by the invention;
Fig. 7 is direct current control flow chart provided by the invention;
Fig. 8 is DC voltage control flow chart provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Cascade multiterminal extra-high voltage direct-current transmission analogue system schematic diagram provided by the invention as shown in Figure 4, this analogue system comprises: take national grid simulation centre digital-to-analogue hybrid simulation equipment as basis, adopt digital-to-analogue hybrid simulation equipment to form an emulation platform of cascade multiterminal extra-high voltage direct-current; Based on both-end extra-high voltage direct-current transmission, control the control protection system that protection forms cascade multiterminal extra-high voltage direct-current transmission; One time emulation platform is connected with control protection system by analog quantity and digital quantity interface; One time emulation platform comprises AC system and the direct current system connecting successively.
AC system comprises Digital Simulation platform and amplifier; Digital Simulation platform is connected by cable with amplifier.AC system part and connection are as shown in Figure 1.Converter transformer, converter valve, DC power transmission line, ground electrode circuit, alternating current filter and DC filter have formed direct current system, and alternating current filter, converter transformer and converter valve are connected successively by cable; Converter valve is connected with ground electrode circuit with DC power transmission line respectively by cable; DC power transmission line, DC filter and ground electrode circuit are connected successively.Wherein, scaled transformer physical model simulation converter transformer, converter valve in the valve plate analog DC transmission of electricity that the cmos element of take is core, with combine analog alternating current filter, DC filter, DC power transmission line and the ground electrode circuit of inductance, resistance, capacity cell.Direct current system part and connection are as shown in Figure 2.
Based on both-end extra-high voltage direct-current, control protection electrical secondary system, feature 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, control protection system is comprised of control protected host and corresponding board on hardware, on software, by relevant control protection logic module, formed, after compiling by related software, be downloaded to and control in protected host, controlling protection system function is arranged in control protected host, main frame comprises voltage regulator, current regulator, direct current controller (being also called current limiting low-voltage controller), overvoltage limiter, calculate link and ALPHAMAX functional module.Between board and main frame, adopt optical fiber to be connected, control the composition of protection system and connect as shown in Figure 3.
By analog quantity and digital quantity Interface Terminal; the control protection system of emulation platform of cascade multiterminal extra-high voltage DC transmission system and cascade multiterminal extra-high voltage direct-current transmission is connected to form to a set of complete cascade multiterminal extra-high voltage direct-current transmission analogue system, and cascade extra-high voltage DC transmission system emulation schematic diagram as shown in Figure 4.Steady-state characteristic and the dynamic Characteristic Simulation research of cascade multiterminal extra-high voltage direct-current control protection system based on this analogue system, have been carried out.
Controlling protection system core is two kinds of different control modes, and direct current is controlled and DC voltage control, and its control principle drawing as shown in Figures 5 and 6.
In direct current is controlled, 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; Direct current controller is connected with current regulator;
Direct current is controlled and is comprised: direct current controller will draw the command value of Trigger Angle after the difference passing ratio integral element of 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 ALPHAMAX functional block is exported as its higher limit, its flow chart as shown in Figure 7.
In DC voltage control, ALPHAMAX functional module is connected with voltage regulator; Calculating link is connected with voltage regulator, overvoltage limiter and current regulator respectively; Direct current controller is connected with current regulator;
DC voltage control comprises: vertical compression current controller will draw the command value of Trigger Angle after the difference passing ratio integral element of 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 ALPHAMAX functional block is exported as voltage regulator higher limit, its flow chart as shown in Figure 8.
Based on cascade multiterminal extra-high voltage direct-current transmission analogue system provided by the invention, carried out 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; Controlling protection simulation study comprises the following steps:
(1) set up direct current system steady state condition, the current ration that changes an emulation platform direct current system is realized the stable operation under different capacity level of cascade multiterminal extra-high voltage direct-current system;
(2) change the AC voltage parameter of the emulation platform AC system being connected with direct current system, by test, draw the steady-state characteristic of cascade multiterminal extra-high voltage direct-current system;
(3) in an emulation platform AC system, carry out earth fault test, 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, response characteristic and the recovery characteristics of checking cascade multiterminal extra-high voltage direct-current system;
(5) for controlling protection system, carry out step response test, checking cascade multiterminal UHV transmission is controlled the response characteristic of protection system parameter; Described 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, correctness, sensitivity and the reliability of checking protection action.
Cascade multiterminal extra-high voltage direct-current transmission analogue system provided by the invention and control guard method thereof, take national grid simulation centre digital-to-analogue hybrid simulation equipment as basis, adopt digital generator analog AC system, scaled transformer physical model simulation converter transformer, converter valve in the valve plate analog DC transmission of electricity that the cmos element of take is core, with combine analog DC power transmission line and the ground electrode circuit of inductance, resistance, capacity cell, research has formed partial simulation system one time; Based on both-end extra-high voltage direct-current, control protection electrical secondary system; feature 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 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.
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 the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (5)
1. a cascade multiterminal extra-high voltage direct-current analogue system, is characterized in that, described analogue system comprises:
Adopt digital-to-analogue hybrid simulation equipment to form an emulation platform of cascade multiterminal extra-high voltage direct-current;
Based on both-end extra-high voltage direct-current transmission, control the control protection system that protection forms cascade multiterminal extra-high voltage direct-current transmission;
A described emulation platform is connected with control protection system by analog quantity and digital quantity interface;
A described emulation platform comprises AC system and the direct current system connecting successively;
Described control protection system comprises main frame and board, between described main frame and board, by optical fiber, connects;
Described main frame comprises voltage regulator, current regulator, direct current controller, overvoltage limiter, calculating link and ALPHAMAX functional module;
Described control protection system comprises two kinds of control modes: direct current is controlled and DC voltage control;
In described direct current is controlled, described ALPHAMAX functional module is connected with current regulator with voltage regulator respectively; Described voltage regulator is connected with current regulator; Described calculating link is connected with voltage regulator with overvoltage limiter respectively; Described direct current controller is connected with current regulator;
Described direct current is controlled and is comprised: direct current controller will draw the command value of Trigger Angle after the difference passing ratio integral element of 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 current regulator higher limit;
In described DC voltage control, described ALPHAMAX functional module is connected with voltage regulator; Described calculating link is connected with voltage regulator, overvoltage limiter and current regulator respectively; Described direct current controller is connected with current regulator;
Described DC voltage control comprises: vertical compression current controller will draw the command value of Trigger Angle after the difference passing ratio integral element of 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 voltage regulator higher limit.
2. cascade multiterminal extra-high voltage direct-current analogue system as claimed in claim 1, is characterized in that, described AC system comprises Digital Simulation platform and amplifier; Described Digital Simulation platform is connected by cable with amplifier.
3. cascade multiterminal extra-high voltage direct-current analogue system as claimed in claim 1, is characterized in that, described direct current system comprises converter transformer, converter valve, alternating current filter, DC filter, DC power transmission line and ground electrode circuit;
Described alternating current filter, converter transformer and converter valve are connected successively by cable;
Described converter valve is connected with ground electrode circuit with DC power transmission line respectively by cable;
Described DC power transmission line, DC filter and ground 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 described converter transformer; The valve plate that the cmos element of take is core is simulated described converter valve; Adopt combine analog alternating current filter, DC filter, DC power transmission line and the ground electrode circuit of inductance, resistance, capacity cell.
5. a control guard method for the cascade multiterminal extra-high voltage direct-current analogue system as described in any one in claim 1-4, is characterized in that, described method comprises the steps:
(1) set up direct current system steady state condition, the current ration that changes an emulation platform direct current system is realized the stable operation under different capacity level of cascade multiterminal extra-high voltage direct-current system;
(2) change the AC voltage parameter of the emulation platform AC system being connected with direct current system, by test, draw the steady-state characteristic of cascade multiterminal extra-high voltage direct-current system;
(3) in an emulation platform AC system, carry out earth fault test, 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, response characteristic and the recovery characteristics of checking cascade multiterminal extra-high voltage direct-current system;
(5) for controlling protection system, carry out step response test, checking cascade multiterminal UHV transmission is controlled the response characteristic of protection system parameter; Described 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, correctness, sensitivity and the reliability of checking protection action.
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| CN103257583B (en) * | 2013-03-29 | 2015-11-18 | 国家电网公司 | A kind of overvoltage control simulation device |
| CN105762811B (en) * | 2016-04-28 | 2018-10-26 | 南方电网科学研究院有限责任公司 | The control system and method for STATCOM and HVDC transmission system |
| 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 |
| 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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