CN103257592B - A kind of no-load direct current voltage control simulation device - Google Patents

Abstract

A kind of no-load direct current voltage control simulation device, belong to electric measurement field, particularly relate to a kind of proving installation of the DC control and protection system simulation study for high-voltage direct-current transmission system, DC voltage reference signal is connected to mode selection switch by the first and second arithmetical operation elements; Second or door is connected to by the 3rd arithmetic arithmetic element and first this schmitt trigger; Unloaded d. c. voltage signal is connected to speed limiting device by the second proportioning element and the 4th arithmetical operation element; 5th arithmetical operation element is connected to the 4th arithmetical operation element; The output terminal of speed limiting device is connected to the three or four arithmetical operation element by the 6th arithmetical operation element; First and door is connected to by second this schmitt trigger; First forms unloaded DC voltage rising signals end with the output terminal of door.This device can be simulated truly, reflect the running status of DC control protective device, for the research of DC control protective device or design provide corresponding simulation result.

Description

A no-load DC voltage control simulation device

technical field

The invention belongs to the field of electrical measurement, and in particular relates to a no-load direct current voltage control simulation test device used for simulation research on direct current control and protection systems of high voltage direct current transmission equipment.

Background technique

The ever-increasing demand for electricity has led to the development of power transmission systems in the direction of long distance, large capacity and high stability. As the construction projects of UHV AC transmission projects and HVDC transmission projects in various power grid regions continue to increase, the power grids in areas where power consumption is concentrated show obvious characteristics of UHV AC-DC hybrid receiving-end power grids with multi-DC feeds. The power grid structure is tight, and the electrical distance between multiple AC and DC lines is closer. After the UHV and EHV AC systems fail, it is easy to cause multiple DCs including high-voltage DCs to fail at the same time, and the commutation of multiple DCs fails. The recovery process will have a greater impact on the AC system. If the recovery strategies of the various DC systems are not properly coordinated, it may also cause continuous commutation failures on multiple DC systems at the same time, and even cause DC blocking. Simultaneous bipolar blocking of multiple DC circuits, large-scale transfer of a large number of power flows may cause system stability problems. This interaction between the AC and DC systems brings great challenges to the safe operation of the UHV AC-DC hybrid power grid.

Therefore, in the research or design stage of HVDC transmission projects, it is necessary to conduct tests and simulations on the stability of the UHV AC-DC hybrid receiving end grid due to the interaction between the AC and DC systems, and refer to the test and simulation results for research or The design results are verified and the stability of the system is evaluated. Chinese utility model patent "a real-time digital simulation model of multi-infeed DC transmission system" (utility model patent number: ZL201210532559.X authorized announcement number: CN102945004A) discloses a real-time digital simulation model of multi-infeed DC A parallel equivalent ultra-high voltage direct current transmission system, the ultra-high voltage direct current transmission system includes a real-time digital simulation model of a primary system and a real-time digital simulation model of a secondary system; the real-time digital simulation model of the primary system includes a converter station and a direct current transmission line, The converter station is set at both ends of the direct current transmission line; the real-time digital simulation model of the secondary system includes a converter station control system and a protection system, and the converter station control system and protection system are connected to the converter station for use in It is used to control and protect the operation of the converter station. Through the control and protection of the operation of the converter station by the control system and protection system of the converter station, it is easy to avoid the impact of multiple DC simultaneous faults and multiple DC faults and the recovery process on the AC system after the AC system fails. However, the simulation model does not involve the simulation of no-load DC voltage control, and cannot truly simulate the no-load DC voltage control operating state of the HVDC DC control protection system.

Contents of the invention

The purpose of the present invention is to provide a no-load DC voltage control simulation device, which can truly simulate and reflect the no-load DC voltage control state of the high-voltage direct current transmission DC control and protection system, and is a research on the no-load DC voltage control of the DC control and protection device. Or design to provide corresponding simulation results to solve the technical problem of providing a verification platform for the research or design of no-load DC voltage control of DC control and protection devices.

The technical solution adopted by the present invention to solve the problems of the technologies described above is:

A no-load direct current voltage control simulation device, which is set in the converter transformer tap control device of the direct current control and protection system, and is used for the simulation of the direct current control and protection system of the high voltage direct current transmission equipment, is characterized in that:

The no-load DC voltage control simulation device includes a tap signal module, first to seventh arithmetic operation elements, a first AND gate, a second OR gate, a second proportional element, an INT-IEEE format conversion element, and a mode selection switch , a rate limiter, a third timer, a first Schmitt trigger, and a second Schmitt trigger, wherein the first arithmetic operation element and the fourth arithmetic operation element are division operation elements, and the second arithmetic operation element is The multiplication operation element, the third arithmetic operation element and the seventh arithmetic operation element are addition and subtraction operation elements, and the fifth arithmetic operation element and the sixth arithmetic operation element are addition operation elements;

The DC voltage reference signal is connected to the mode selection switch through the first arithmetic operation element and the second arithmetic operation element in sequence; the output terminal of the mode selection switch is sequentially passed through the third arithmetic operation element and the first Schmitt trigger The device is connected to an input end of the second OR gate; the output end of the tap signal module is connected to the other input end of the second OR gate; the output end of the second OR gate constitutes The no-load DC voltage drop signal terminal of the no-load DC voltage control simulation device;

The no-load DC voltage signal is connected to the rate limiter through the second proportional element and the fourth arithmetic operation element in turn; the INT-IEEE format conversion element is connected to the said fifth arithmetic operation element through the The fourth arithmetic operation element mentioned above; the output end of the rate limiter is connected to the third arithmetic operation element and the seventh arithmetic operation element through the sixth arithmetic operation element; the seventh arithmetic operation The output end of the element is connected to an input end of the first AND gate through the second Schmitt trigger; the AC power switch signal end is connected to the first AND gate through the third timer. The other input end of the AND gate; the output end of the first AND gate constitutes the no-load DC voltage rising signal end of the no-load DC voltage control simulation device.

A preferred technical solution of the no-load DC voltage control simulation device of the present invention is characterized in that the tap signal module includes a comparator, an eighth arithmetic operation element, second to fifth AND gates, a first or Gate, first to third inverters, first proportional element, IEEE-INT format conversion element, first timer, second timer, wherein, the eighth arithmetic operation element is an addition and subtraction operation element; tap position signal The terminal is connected to an input terminal of the second AND gate through the comparator and the second inverter in turn; the AC power switch signal terminal is connected to the second AND gate through the first inverter. The other input terminal of the gate; the output terminal of the second AND gate is connected to an input terminal of the fifth AND gate; the output terminal of the first timer is connected to the third AND gate One input terminal, and connected to one input terminal of the first OR gate through the third inverter; the neutral line current signal passes through the first proportional element and the eighth arithmetic operation element in sequence, IEEE - the INT format conversion element and the second timer are connected to the other input end of the third AND gate; the output end of the third AND gate is connected to the other input end of the first OR gate; The output end of the first OR gate is connected to the other input end of the fifth AND gate through the fourth AND gate; the output end of the fifth AND gate constitutes the tap signal module output, connected to the second OR gate.

The beneficial effects of the present invention are:

1. The no-load DC voltage control simulation device of the present invention can truly simulate and reflect the no-load DC voltage control operation state of the DC control protection device, and provide corresponding simulation results for the research or design of the DC control protection device;

2. The no-load DC voltage control simulation device of the present invention has the advantage of cross-platform simulation testing, which can be realized with actual components in a real environment, and can be realized with computer software in a virtual environment;

Description of drawings

Fig. 1 is a functional block diagram of a simulation device for a DC control and protection system;

Fig. 2 is a schematic circuit diagram of the no-load DC voltage control simulation device of the present invention.

The labels of the components in the above figure: 100-HVDC transmission equipment, 110-AC filter switching device, 120-converter transformer, 130-thyristor converter, 200-control unit, 210-angle, current and voltage reference value Calculation device, 220-converter trigger angle control device, 230-trigger pulse generator, 240-converter tap control device, 250-pole power control device, 260-overload control device, 270-reactive power control device, 300-DC system protection unit, 900-operation control workstation. 2410-tap signal module, 2411~2418-the first to the eighth arithmetic operation element, 2421~2425-the first to the fifth AND gate, 2426-the first OR gate, 2427-the second OR gate, 2431~2433- The first to third inverters, 2434-first proportional element, 2435-second proportional element, 2436-IEEE-INT format conversion element, 2437-INT-IEEE format conversion element, 2441-mode selection switch, 2442-speed Limiter, 2443-comparator, 2451～2453-first to third timer, 2454-first Schmitt trigger, 2455-second Schmitt trigger, PACSW-AC power switch signal terminal, DEC_UDI0- No-load DC voltage drop signal terminal, INC_UDI0-no-load DC voltage rise signal terminal, IDNC_100 neutral wire current signal, TAPS1-tap position signal terminal, UDREF_R-DC voltage reference signal, UDI0100-no-load DC voltage signal, UDI0_REF- No-load DC voltage reference signal.

detailed description

In order to better understand the above-mentioned technical solution of the present invention, a further detailed description will be given below in conjunction with the accompanying drawings and embodiments.

Fig. 2 shows an embodiment of the no-load DC voltage control simulation device of the present invention, which is connected to the converter tap control device 240 of the DC control and protection system for the simulation of the DC control and protection system of the HVDC power transmission equipment. The no-load DC voltage control simulation device of the present invention is one of the basic functional units of the converter tap control device 240 of the DC control and protection system. The simulation device of the DC control and protection system of HVDC transmission equipment is shown in Figure 1. The converter transformer tap control device 240 is a link in the direct current transmission control system for automatically adjusting the position of the on-load tap tap of the converter transformer 120, and its purpose is to maintain the firing angle of the rectifier or the cut-off angle of the inverter side (Arc extinguishing angle) within the specified range, or maintain the DC voltage or the no-load voltage of the valve side winding of the converter transformer within the specified range.

As shown in Figure 2, the no-load DC voltage control simulation device of the present invention includes a tap signal module 2410, first to seventh arithmetic operation elements 2411-2417, a first AND gate 2421, a second OR gate 2427, a second ratio Element 2435, INT-IEEE format conversion element 2437, mode selection switch 2441, rate limiter 2442, third timer 2453, first Schmitt trigger 2454, second Schmitt trigger 2455, wherein, the first arithmetic Operation element 2411 and the fourth arithmetic operation element 2414 are division operation elements, the second arithmetic operation element 2412 is a multiplication operation element, the third arithmetic operation element 2413 and the seventh arithmetic operation element 2417 are addition and subtraction operation elements, and the fifth arithmetic operation element 2415 and the sixth arithmetic operation element 2416 are addition operation elements;

The DC voltage reference signal UDREF_R passes through the first arithmetic operation element 2411 and the second arithmetic operation element 2412 in turn, and is connected to the mode selection switch 2441; the output terminal of the mode selection switch 2441 passes through the third arithmetic operation element 2413 and the first Schmitt in turn The flip-flop 2454 is connected to an input end of the second OR gate 2427; the output end of the tap signal module 2410 is connected to the other input end of the second OR gate 2427; the output end of the second OR gate 2427 constitutes an unloaded The no-load DC voltage drop signal terminal DEC_UDI0 of the DC voltage control simulation device.

The no-load DC voltage signal UDI0100 passes through the second proportional element 2435 and the fourth arithmetic operation element 2414 in turn, and is connected to the rate limiter 2442; the INT-IEEE format conversion element 2437, through the fifth arithmetic operation element 2415, is connected to the fourth arithmetic operation Element 2414; the output of the rate limiter 2442, through the sixth arithmetic operation element 2416, is connected to the third arithmetic operation element 2413 and the seventh arithmetic operation element 2417; the output of the seventh arithmetic operation element 2417, through the second Smith The special trigger 2455 is connected to an input end of the first AND gate 2421; the AC power switch signal terminal PACSW is connected to the other input end of the first AND gate 2421 through the third timer 2453; the output of the first AND gate 2421 The terminal constitutes the no-load DC voltage rise signal terminal INC_UDI0 of the no-load DC voltage control simulation device of the present invention.

According to the embodiment of the no-load DC voltage control simulation device of the present invention shown in FIG. 2, the tap signal module 2410 is shown in the dotted line frame area in FIG. To the fifth AND gate 2422-2425, the first OR gate 2426, the first to the third inverter 2431-2433, the first proportional element 2434, the IEEE-INT format conversion element 2436, the first timer 2451, the second timing 2452, wherein the eighth arithmetic operation element 2418 is an addition and subtraction operation element; the tap position signal terminal TAPS1 is connected to an input end of the second AND gate 2422 through the comparator 2443 and the second inverter 2432 in turn; the AC power The switch signal terminal PACSW is connected to the other input end of the second AND gate 2422 through the first inverter 2431; the output end of the second AND gate 2422 is connected to an input end of the fifth AND gate 2425; the first timer The output terminal of 2451 is connected to an input terminal of the third AND gate 2423, and is connected to an input terminal of the first OR gate 2426 through the third inverter 2433; the neutral line current signal IDNC_100 passes through the first proportional element in turn 2434, the eighth arithmetic operation element 2418, the IEEE-INT format conversion element 2436 and the second timer 2452, are connected to another input end of the third AND gate 2423; the output end of the third AND gate 2423 is connected to the first or The other input end of gate 2426; The output end of the first OR gate 2426 is connected to the other input end of the fifth AND gate 2425 through the fourth AND gate 2424; The output end of the fifth AND gate 2425 constitutes the tap signal The output terminal of the module 2410 is connected to the second OR gate 2427 .

Those of ordinary skill in the technical field should recognize that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not used as limitations to the present invention. All changes and modifications will fall within the protection scope of the claims of the present invention.

Claims (2)

1. a no-load direct current voltage control simulation device, is arranged in the change of current variation apparatus for controlling connection of DC control and protection system, for the emulation of the DC control and protection system of high-voltage direct-current transmission system, it is characterized in that:

Described no-load direct current voltage control simulation device comprises tap signaling module, first to the 7th arithmetical operation element, first and door, second or door, second proportioning element, INT-IEEE format conversion element, mode selection switch, speed limiting device, 3rd timer, first this schmitt trigger, second this schmitt trigger, wherein, first arithmetical operation element and the 4th arithmetical operation element are division arithmetic element, second arithmetical operation element is multiplying element, 3rd arithmetic arithmetic element and the 7th arithmetical operation element are plus and minus calculation element, 5th arithmetical operation element and the 6th arithmetical operation element are additive operation element,

DC voltage reference signal by the first arithmetical operation element and the second arithmetical operation element, is connected to described mode selection switch successively; The output terminal of described mode selection switch, successively by the 3rd arithmetic arithmetic element and first this schmitt trigger, is connected to an input end of described second or door; The output terminal of described tap signaling module, is connected to another input end of described second or door; Described second or the output terminal of door, form the unloaded DC voltage dropping signal end of described no-load direct current voltage control simulation device;

Unloaded d. c. voltage signal, successively by the second proportioning element and the 4th arithmetical operation element, is connected to described speed limiting device; Described INT-IEEE format conversion element, by the 5th described arithmetical operation element, is connected to the 4th described arithmetical operation element; The output terminal of described speed limiting device, by the 6th described arithmetical operation element, is connected to the 3rd described arithmetic arithmetic element and the 7th arithmetical operation element; The output terminal of described 7th arithmetical operation element, by described second this schmitt trigger, is connected to an input end of described first and door; AC power switch signal end, by the 3rd described timer, is connected to another input end of described first and door; Described first with the output terminal of door, form the unloaded DC voltage rising signals end of described no-load direct current voltage control simulation device.

2. no-load direct current voltage control simulation device according to claim 1, it is characterized in that described tap signaling module comprises comparer, the 8th arithmetical operation element, second to the 5th and door, first or door, first to the 3rd phase inverter, the first proportioning element, IEEE-INT format conversion element, first timer, second timer, wherein, the 8th arithmetical operation element is plus and minus calculation element; Tap joint position signal end, successively by described comparer and the second phase inverter, is connected to an input end of described second and door; AC power switch signal end, by the first described phase inverter, is connected to another input end of described second and door; Described second with the output terminal of door, be connected to the described 5th with an input end of door; The output terminal of described first timer, is connected to an input end of the described 3rd and door, and by the 3rd described phase inverter, is connected to an input end of described first or door; Neutral current signal passes through the first described proportioning element successively, the 8th arithmetical operation element, IEEE-INT format conversion element and second timer, is connected to another input end of the described 3rd and door; Described 3rd with the output terminal of door, be connected to another input end of described first or door; Described first or the output terminal of door, by the described the 4th and door, be connected to the described 5th with another input end of door; Described 5th with the output terminal of door, form the output terminal of described tap signaling module, be connected to described second or door.