CN103257591B - A kind of tap lifting instruction simulator - Google Patents

Abstract

A tap lifting command simulation device belongs to the field of electrical measurement, and in particular relates to a test device used for simulation research of DC control and protection systems for high-voltage direct current transmission equipment. The neutral line current signal passes through the first and second proportional elements, connected To the first and second arithmetic operation elements; the first arithmetic operation element is connected to the tap rise signal module through the first absolute value operator; the voltage rise signal end of the voltage control module and the angle rise signal end of the angle control module are connected To the tap rise signal module; the second arithmetic operation element is connected to the tap drop signal module through the second absolute value operator; the voltage drop signal end of the voltage control module and the angle drop signal end of the angle control module are connected to the tap Drop signal module. The device can truly simulate and reflect the operating state of the DC control and protection device, and provide corresponding simulation results for the research or design of the DC control and protection device.

Description

A tap lifting command simulation device

technical field

The invention belongs to the field of electrical measurement, and in particular relates to a tap position simulation test device used for simulation research of a DC control and protection system 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 direct current transmission system" (utility model patent number: ZL201210532559.X authorization announcement number: CN102945004A) discloses a real-time digital simulation model of multi-infeed direct current 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 the tap position, so it cannot truly simulate the tap position operation state of the HVDC DC control and protection system.

Contents of the invention

The purpose of the present invention is to provide a tap lifting instruction simulation device, which can truly simulate and reflect the tap position status of the HVDC DC control and protection system, and provide corresponding support for the research or design of the tap position of the DC control and protection device. The simulation results solve the technical problem of providing a verification platform for the research or design of the tap position of the DC control and protection device.

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

A tap lifting instruction simulation device, which is set in the converter tap control device of the DC control and protection system, and is used for the simulation of the DC control and protection system of the high-voltage direct current transmission equipment, is characterized in that:

The tap lifting command simulation device includes a first proportional element, a second proportional element, a first arithmetic operation element, a second arithmetic operation element, a first absolute value calculator, a second absolute value calculator, and a tap rise signal module, tap drop signal module, voltage control module and angle control module;

The neutral line current signal is respectively connected to the first arithmetic operation element and the second arithmetic operation element through the first proportional element and the second proportional element;

The output terminal of the first arithmetic operation element is connected to the current signal input terminal of the tap rising signal module through the first absolute value operator; the voltage rising signal terminal of the voltage control module is connected to the tap rising signal terminal. The voltage signal input end of the signal module; the angle rise signal end of the angle control module is connected to the angle signal input end of the tap rise signal module; the output end of the tap rise signal module constitutes the tap lift command The tap rising signal terminal of the simulation device;

The output terminal of the second arithmetic operation element is connected to the current signal input terminal of the tap drop signal module through the second absolute value operator; the voltage drop signal terminal of the voltage control module is connected to the tap drop signal terminal. The voltage signal input end of the signal module; the angle drop signal end of the angle control module is connected to the angle signal input end of the tap drop signal module; the output end of the tap drop signal module constitutes the tap drop command The tap drop signal terminal of the simulated device.

A preferred technical scheme of the tap lifting command simulation device of the present invention is characterized in that the tap rising signal module and the tap falling signal module are two tap signal modules with the same structure; the tap The joint signal module includes a first Schmitt trigger, an inverter, a first AND gate to a third AND gate, an OR gate, a first timer, a second timer and a first mode selection switch; the tap The current signal input terminal of the signal module is connected to the first input terminal of the first AND gate through the first Schmitt trigger; the voltage signal input terminal of the tap signal module is connected to the first AND gate of the first input terminal. Two input terminals; the rectification state signal is connected to the first input terminal of the second AND gate, and is connected to the third input terminal of the first AND gate through an inverter; the angle signal input terminal of the tap signal module is connected to To the second input terminal of the second AND gate; the output terminals of the first AND gate and the second AND gate are respectively connected to an input terminal of the OR gate; the output terminal of the OR gate passes through the first mode selection switch in turn, and the third An AND gate and a second timer are connected to the output terminal of the tap signal module.

A better technical solution of the tap lifting instruction simulation device of the present invention is characterized in that the voltage control module includes a third arithmetic operation element, a third proportional element, a second Schmitt trigger and a third Schmitt trigger The DC voltage signal is connected to the input end of the third arithmetic operation element; the output end of the third arithmetic operation element is connected to the voltage rise signal end of the voltage control module through the third proportional element and the second Schmitt trigger in turn ; The output terminal of the third arithmetic operation element is connected to the voltage drop signal terminal of the voltage control module through the third Schmitt trigger.

An improved technical solution of the tap lifting command simulation device of the present invention is characterized in that the angle control module includes a first inertial element, a second inertial element, a fourth arithmetic operation element, a fifth arithmetic operation element, and a second mode selection switch, the fourth proportional element, the fourth Schmitt trigger and the fifth Schmitt trigger; the firing angle signal is connected to an input end of the second mode selection switch through the first inertial element and the fourth arithmetic operation element; The arc extinguishing angle signal is connected to the other input end of the second mode selection switch through the second inertia element and the fifth arithmetic operation element; the rectification state signal is connected to the control input end of the second mode selection switch; the second mode selection switch The output terminal is connected to the angle rising signal terminal of the angle control module through the fourth proportional element and the fourth Schmitt trigger in turn; the output terminal of the second mode selection switch is connected to the angle through the fifth Schmitt trigger The angle drop signal terminal of the control module.

The beneficial effects of the present invention are:

1. The tap lifting command simulation device of the present invention can truly simulate and reflect the tap position 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 tap lifting instruction simulation device of the present invention has the advantage of cross-platform simulation test, 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 diagram of the main circuit of the tap lifting instruction simulation device of the present invention;

Fig. 3 is a schematic diagram of the voltage control module of the tap lifting instruction simulation device of the present invention;

Fig. 4 is a schematic diagram of the angle control module of the tap lifting instruction 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 rising signal module, 2420-Tap falling signal module, 2430-Voltage control module, 2440-Angle control module, 2411～2414-First to fourth proportional components, 2415-First absolute value calculator, 2216 - the second absolute value operator, 2421-2425- the first to the fifth arithmetic operation element, 2431-2435- the first to the fifth Schmitt trigger, 2441-2443- the first to the third AND gate, 2444- Inverter, 2445-OR gate, 2451-first timer, 2452-second timer, 2453-first mode selection switch, 2454-second mode selection switch, 2461-first inertial element, 2462-second Inertial element, INC_TC-tap rising signal terminal, DEC_TC-tap falling signal terminal, INCVOLT-voltage rising signal terminal, DECVOLT-voltage falling signal terminal, INCANGLE-angle rising signal terminal, DECANGLE-angle falling signal terminal, IDNC_100 neutral Line current signal, RECT-rectification status signal.

Detailed ways

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 tap lifting command simulation device of the present invention, which is connected to the converter tap control device 240 of the DC control and protection system, and is used for the simulation of the DC control and protection system of the HVDC transmission equipment. The tap lifting command 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 extinction 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 tap lifting command simulation device of the present invention includes a first proportional element 2411, a second proportional element 2412, a first arithmetic operation element 2421, a second arithmetic operation element 2422, a first absolute value operator 2415, The second absolute value calculator 2216, the tap rising signal module 2410, the tap falling signal module 2420, the voltage control module 2430 and the angle control module 2440;

The neutral line current signal IDNC_100 is connected to the first arithmetic operation element 2421 and the second arithmetic operation element 2422 through the first proportional element 2411 and the second proportional element 2412 respectively;

The output terminal of the first arithmetic operation element 2421 is connected to the current signal input terminal of the tap rise signal module 2410 through the first absolute value operator 2415; the voltage rise signal terminal INCVOLT of the voltage control module 2430 is connected to the tap rise signal The voltage signal input end of module 2410; The angle rising signal end INCANGLE of angle control module 2440 is connected to the angle signal input end of tap rising signal module 2410; The output end of tap rising signal module 2410 constitutes the tap lifting of the present invention The tap rising signal terminal INC_TC of the command emulation device;

The output terminal of the second arithmetic operation element 2422 is connected to the current signal input terminal of the tap drop signal module 2420 through the second absolute value operator 2416; the voltage drop signal terminal DECVOLT of the voltage control module 2430 is connected to the tap drop signal The voltage signal input end of the module 2420; the angle drop signal end DECANGLE of the angle control module 2440 is connected to the angle signal input end of the tap drop signal module 2420; the output end of the tap drop signal module 2420 constitutes the tap drop of the present invention The tap-down signal terminal DEC_TC of the command emulation device.

According to the embodiment of the tap lifting instruction simulation device of the present invention shown in Fig. 2, the tap rising signal module 2410 and the tap falling signal module 2420 are two tap signal modules with the same structure, as shown in Fig. 2 . Shown in the dashed box area; the tap signal module includes a first Schmitt trigger 2431, an inverter 2444, a first AND gate 2441 to a third AND gate 2441-2443, an OR gate 2445, a first timer 2451, the second timer 2452 and the first mode selection switch 2453; the current signal input terminal of the tap signal module is connected to the first input terminal of the first AND gate 2441 through the first Schmitt trigger 2431 The voltage signal input terminal of the tap signal module is connected to the second input terminal of the first AND gate 2441; the rectification state signal RECT is connected to the first input terminal of the second AND gate 2442, and passes through the inverter 2444 Connected to the third input end of the first AND gate 2441; the angle signal input end of the tap signal module is connected to the second input end of the second AND gate 2442; the first AND gate 2441 and the second AND gate 2442 The output terminals of the OR gate 2445 are respectively connected to an input terminal of the OR gate 2445; the output terminals of the OR gate 2445 are connected to the tap through the first mode selection switch 2453, the third AND gate 2443 and the second timer 2452 in turn. Output of the signal module.

An embodiment of the voltage control module 2430 of the tap lifting command simulation device of the present invention is shown in Figure 3, including a third arithmetic operation element 2423, a third proportional element 2413, a second Schmitt trigger 2432 and a third Smith special trigger 2433; the DC voltage signal is connected to the input end of the third arithmetic operation element 2423; the output end of the third arithmetic operation element 2423, through the third proportional element 2413 and the second Schmitt trigger 2432, is connected to the voltage The voltage rise signal terminal INCVOLT of the control module 2430 ; the output terminal of the third arithmetic operation element 2423 is connected to the voltage drop signal terminal DECVOLT of the voltage control module 2430 through the third Schmitt trigger 2433 .

An embodiment of the angle control module 2440 of the tap lifting command simulation device of the present invention is shown in FIG. 4 , including a first inertial element 2461, a second inertial element 2462, a fourth arithmetic operation element 2424, and a fifth arithmetic operation element 2425. The second mode selection switch 2454, the fourth proportional element 2414, the fourth Schmitt trigger 2434 and the fifth Schmitt trigger 2435; the firing angle signal is connected to the first inertial element 2461 and the fourth arithmetic operation element 2424. One input end of the second mode selection switch 2454; the arc extinguishing angle signal is connected to the other input end of the second mode selection switch 2454 through the second inertial element 2462 and the fifth arithmetic operation element 2425; the rectification state signal RECT is connected to the first The control input terminal of the second mode selection switch 2454; the output terminal of the second mode selection switch 2454 is connected to the angle rising signal terminal INCANGLE of the angle control module 2440 through the fourth proportional element 2414 and the fourth Schmitt trigger 2434 in turn; The output end of the second mode selection switch 2454 is connected to the angle descending signal end DECANGLE of the angle control module 2440 through the fifth Schmitt trigger 2435 .

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 (4)

1. A tap lifting command simulation device is arranged in the converter transformer tap control device of the DC control and protection system, and is used for the simulation of the DC control and protection system of the HVDC transmission equipment, characterized in that: The tap lifting command simulation device includes a first proportional element, a second proportional element, a first arithmetic operation element, a second arithmetic operation element, a first absolute value calculator, a second absolute value calculator, and a tap rise signal module, tap drop signal module, voltage control module and angle control module; The neutral line current signal is respectively connected to the first arithmetic operation element and the second arithmetic operation element through the first proportional element and the second proportional element; The output terminal of the first arithmetic operation element is connected to the current signal input terminal of the tap rising signal module through the first absolute value operator; the voltage rising signal terminal of the voltage control module is connected to the tap rising signal terminal. The voltage signal input end of the signal module; the angle rise signal end of the angle control module is connected to the angle signal input end of the tap rise signal module; the output end of the tap rise signal module constitutes the tap lift command The tap rising signal terminal of the simulation device; The output terminal of the second arithmetic operation element is connected to the current signal input terminal of the tap drop signal module through the second absolute value operator; the voltage drop signal terminal of the voltage control module is connected to the tap drop signal terminal. The voltage signal input end of the signal module; the angle drop signal end of the angle control module is connected to the angle signal input end of the tap drop signal module; the output end of the tap drop signal module constitutes the tap drop command The tap drop signal terminal of the simulated device. 2. The tap lifting instruction simulation device according to claim 1, wherein the tap rising signal module and the tap falling signal module are two tap signal modules with the same structure; The module includes a first Schmitt trigger, an inverter, a first AND gate to a third AND gate, an OR gate, a first timer, a second timer and a first mode selection switch; the tap signal module The current signal input end of the first Schmitt trigger is connected to the first input end of the first AND gate; the voltage signal input end of the tap signal module is connected to the second input end of the first AND gate terminal; the rectification state signal is connected to the first input terminal of the second AND gate, and is connected to the third input terminal of the first AND gate through an inverter; the angle signal input terminal of the tap signal module is connected to the second The second input terminal of the two AND gates; the output terminals of the first AND gate and the second AND gate are respectively connected to an input terminal of the OR gate; the output terminal of the OR gate passes through the first mode selection switch in turn, and the third AND gate and a second timer connected to the output of the tap signal module. 3. The tap lifting instruction simulation device according to claim 1, wherein the voltage control module includes a third arithmetic operation element, a third proportional element, a second Schmitt trigger and a third Schmitt trigger; The DC voltage signal is connected to the input end of the third arithmetic operation element; the output end of the third arithmetic operation element is connected to the voltage rise signal end of the voltage control module through the third proportional element and the second Schmitt trigger in turn; The output terminals of the three arithmetic operation elements are connected to the voltage drop signal terminal of the voltage control module through the third Schmitt trigger. 4. The tap lifting command simulation device according to claim 1, wherein the angle control module includes a first inertial element, a second inertial element, a fourth arithmetic operation element, a fifth arithmetic operation element, and a second mode selection switch , the fourth proportional element, the fourth Schmitt trigger and the fifth Schmitt trigger; the firing angle signal is connected to an input end of the second mode selection switch through the first inertia element and the fourth arithmetic operation element; The arc angle signal is connected to the other input end of the second mode selection switch through the second inertial element and the fifth arithmetic operation element; the rectification state signal is connected to the control input end of the second mode selection switch; the output of the second mode selection switch The terminal is connected to the angle rising signal terminal of the angle control module through the fourth proportional element and the fourth Schmitt trigger in turn; the output terminal of the second mode selection switch is connected to the angle control module through the fifth Schmitt trigger The angle drop signal terminal of the module.