CN103257577A - Inverter maximum fire angle control simulation device - Google Patents

Abstract

An inverter maximum firing angle control simulation device, which belongs to the field of electrical measurement, in particular relates to an inverter maximum firing angle control simulation test device for simulation research on DC control and protection systems of high-voltage direct current transmission equipment, including the sixth inertia Element, the first trigonometric function element, rate limiter, the third trigonometric function element and the first to the third arithmetic operation element; the input terminal of the sixth inertial element is connected to the input signal end through the first arithmetic operation element, the sixth inertial The output end of the element and the first trigonometric function element is connected to the input end of the rate limiter after being combined by the second arithmetic operation element; the output end of the rate limiter passes through the third trigonometric function element and the third arithmetic operation element in turn, Connect to the inverter maximum firing angle signal terminal. 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

An inverter maximum firing angle control simulation device

technical field

The invention belongs to the field of electrical measurement, and in particular relates to an inverter maximum firing angle control 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 maximum firing angle control of the inverter, and cannot truly simulate the operating state of the maximum firing angle control of the inverter in the HVDC DC control protection system.

Contents of the invention

The purpose of the present invention is to provide an inverter maximum trigger angle control simulation device, which can truly simulate and reflect the inverter maximum trigger angle control state of the high-voltage direct current transmission DC control and protection system, and is an inverter of the DC control and protection device. Provide corresponding simulation results for the research or design of the maximum firing angle control of the inverter, and solve the technical problem of providing a verification platform for the research or design of the inverter maximum firing angle control of the DC control protection device.

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

An inverter maximum firing angle control simulation device, which is set in the converter firing angle 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 inverter maximum firing angle control simulation device includes a sixth inertial element, a first trigonometric function element, a rate limiter, a third trigonometric function element and first to third arithmetic operation elements;

The input end of the sixth inertial element is connected to the input signal end through the first arithmetic operation element, and the output end of the sixth inertial element and the first trigonometric function element is connected to the The input end of the rate limiter; the output end of the rate limiter is connected to the maximum firing angle signal end of the inverter through the third trigonometric function element and the third arithmetic operation element in turn.

A preferred technical solution of the inverter maximum firing angle control simulation device of the present invention is characterized in that the inverter maximum firing angle control simulation device also includes a seventh inertial element, a third extreme value selector, The second trigonometric function element and the fourth to sixth arithmetic operation elements; the input end of the seventh inertial element is connected to the input signal end, and the output end of the seventh inertial element and the third extreme value selector is sequentially passed through the first The fourth arithmetic operation element and the fifth arithmetic operation element are connected to the input ends of the second arithmetic operation element and the sixth arithmetic operation element; the output end of the sixth arithmetic operation element is connected to the lower end of the rate limiter Limit input.

The beneficial effects of the present invention are:

1. The inverter maximum firing angle control simulation device of the present invention can truly simulate and reflect the inverter maximum firing angle 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 inverter maximum firing angle control 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 circuit diagram of the inverter maximum firing angle 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. 2226-sixth inertial element, 2227-seventh inertial element, 2243-third extreme value selector, 2251-2256-first to sixth arithmetic operation element, 2262-speed limiter, 2271-2273-first to second Trigonometric function element, ALPHA_MAX- the signal terminal of the maximum firing angle of the inverter.

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.

Figure 2 shows an embodiment of the inverter maximum firing angle control simulation device of the present invention, which is connected in the converter firing angle 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 . The inverter maximum firing angle control simulation device of the present invention is one of the basic functional units of the converter firing angle control device 220 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.

As shown in Figure 2, the inverter maximum firing angle control simulation device of the present invention includes a sixth inertial element 2226, a first trigonometric function element 2271, a rate limiter 2262, a third trigonometric function element 2273 and first to third arithmetic Computing elements 2251-2253;

The input end of the sixth inertial element 2226 is connected to the input signal end IORD_LIM through the first arithmetic operation element 2251, and the output end of the sixth inertial element 2226 and the first trigonometric function element 2271 is combined through the second arithmetic operation element 2252 and connected to To the input end of the rate limiter 2262; the output end of the rate limiter 2262 is connected to the maximum firing angle signal terminal ALPHMAX of the inverter through the third trigonometric function element 2273 and the third arithmetic operation element 2253 in turn.

According to the embodiment shown in Figure 2, the inverter maximum firing angle control simulation device of the present invention also includes a seventh inertial element 2227, a third extreme value selector 2243, a second trigonometric function element 2272 and fourth to sixth arithmetic Operation elements 2254-2256; the input end of the seventh inertial element 2227 is connected to the input signal end, and the output end of the seventh inertial element 2227 and the third extreme value selector 2243 passes through the fourth arithmetic operation element 2254 and the fifth arithmetic operation in turn The element 2255 is connected to the input ends of the second arithmetic operation element 2252 and the sixth arithmetic operation element 2256 ; the output end of the sixth arithmetic operation element 2256 is connected to the lower limit input end of the rate limiter 2262 .

The main function of the simulation device for controlling the maximum firing angle of the inverter of the present invention is to ensure that the inverter side of the converter has a positive slope characteristic in the transient state, which is beneficial to the stability and recovery of the system under the disturbance.

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. the maximum trigger angle control simulator of inverter is arranged in the transverter trigger angle control device of DC control protection system, is used for the emulation of the DC control protection system of high-voltage direct-current transmission system, it is characterized in that:

The maximum trigger angle control simulator of described inverter comprises the 6th inertance element, the first trigonometric function element, speed limiting device, the 3rd trigonometric function element and first to the 3rd arithmetic arithmetic element;

The input end of described the 6th inertance element, be connected to the input signal end by the first arithmetical operation element, the output terminal of described the 6th inertance element and the first trigonometric function element after the merging of the second arithmetical operation element, is connected to the input end of described speed limiting device; The output terminal of described speed limiting device successively by described the 3rd trigonometric function element and the 3rd arithmetic arithmetic element, is connected to the maximum angle signal end that triggers of inverter.

2. the maximum trigger angle control simulator of inverter according to claim 1, it is characterized in that the maximum trigger angle control simulator of described inverter also comprises the 7th inertance element, the 3rd extreme value selector switch, the second trigonometric function element and the 4th to the 6th arithmetical operation element; The input end of described the 7th inertance element is connected to the input signal end, the output terminal of described the 7th inertance element and the 3rd extreme value selector switch, by the 4th arithmetical operation element and the 5th arithmetical operation element, be connected to the input end of the described second arithmetical operation element and the 6th arithmetical operation element successively; The output terminal of described the 6th arithmetical operation element is connected to the lower limit input end of described speed limiting device.

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