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Three-phase capacitor with silicon controlled rectifier without phase sequence detection and synchronous non-delay switching control method

A control method and phase sequence detection technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve the problems of complicated software and hardware design, waiting, and high residual voltage of capacitors, so as to avoid phase sequence detection and application. Great value, the effect of improving the speed of response

Active Publication Date: 2017-05-24
哈尔滨中创电气技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention solves the problem that the residual voltage of the capacitor is too high after removing the thyristor, and the problem of having to wait for re-switching, and the problem of complex software and hardware design caused by the need to judge the phase sequence of the access voltage in the traditional control method

Method used

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  • Three-phase capacitor with silicon controlled rectifier without phase sequence detection and synchronous non-delay switching control method
  • Three-phase capacitor with silicon controlled rectifier without phase sequence detection and synchronous non-delay switching control method
  • Three-phase capacitor with silicon controlled rectifier without phase sequence detection and synchronous non-delay switching control method

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specific Embodiment approach 1

[0028] Specific Embodiments 1. The three-phase capacitor with silicon controlled rectifier described in this embodiment has no phase-sequence detection synchronous and no-delay switching control method,

[0029] The cutting control method includes the steps of:

[0030] A1. Voltage detection link: only detect the phase angle of the AC phase voltage;

[0031] A2, switching phase determination link: through the comparator, according to the phase angle to determine whether to reach the cutting time;

[0032] A3. The link of issuing the cutting command: when the cutting time is reached, the cutting SCR command is issued at the same time;

[0033] A4. During the cutting process, the actual cutting sequence of the equipment is monitored through the zero-crossing detection circuit;

[0034] A5. When the equipment needs to be put into operation again, the silicon controlled rectifier removed later should be put into operation first.

specific Embodiment approach 2

[0035] Specific implementation mode two, refer to figure 2 and Figure 7 Describe this embodiment, the three-phase capacitor with silicon controlled rectifier non-phase sequence detection synchronous non-delay switching control method described in this embodiment,

[0036] The method is realized based on the following device, which includes: a main circuit 1, an AC phase voltage detection module 2, an AC phase phase detection module 3, a cutting phase angle determination module 4, a cutting command sending module 5, a zero-crossing detection circuit and Equipment removal sequence detection module 6 and input control module 7 again;

[0037] The cutting control method is realized through the following steps:

[0038] Step 1. Main circuit connection and voltage detection: When the main circuit 1 is connected, the three-phase access lines are sequentially named A, B, and C, and at the same time, the AC phase voltage detection module 2 is used to detect the AC phase voltage;

...

specific Embodiment approach 3

[0048] Specific embodiment three. This specific embodiment is a further description of the three-phase capacitor with thyristor with no phase sequence detection, synchronous and delay-free switching control method described in specific embodiment two. In this embodiment, the step two The AC phase phase detection module 3 determines the phase angle zero point of the AC phase voltage through a zero-crossing detection method.

[0049] In this embodiment, the zero-crossing detection method can be realized by a zero-crossing detection circuit.

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Abstract

The invention provides a synchronous switching control method suitable for a three-phase capacitor provided with a silicon controlled rectifier and free of phase sequence detection or switching delay, and relates to the field of reactive compensation of a power system. The synchronous switching control method aims to solve the problems that after the silicon controlled rectifier is switched off, the residual voltage of the capacitor is too high, an operator must wait when secondary switching is conducted, and by the adoption of a traditional control method, the phase sequence of input voltage needs to be judged, so that design of software and hardware is complicated. The synchronous switching control method is simple and reliable, only one line voltage needs to be detected, a current zero crossing point and the phase sequence of the input voltage do not need to be detected, it is guaranteed that switching on and switching off are conducted at the current zero crossing point, the voltages at the two ends of a switch device are always below two times of peak voltage after the capacitor is switched off, so that when secondary switching is conducted, a voltage zero crossing point must exist at the two ends of the switching device, switching can be conducted without delay waiting, and the response speed of the system is increased. The synchronous switching control method is suitable for a three-phase compensation type capacitor reactive compensation device.

Description

technical field [0001] The invention relates to the field of reactive power compensation of electric power systems. Background technique [0002] The switching capacitor type reactive power compensation device can effectively improve the power factor, and its price is low, so it is widely used in power consumption occasions that do not require high reactive power response speed. There are many types of switching capacitive reactive power compensation devices, mainly including relay switching, thyristor switching and the combination of the two. Since the device with thyristor switching can accurately control the voltage zero-crossing input and current zero-crossing cut-off, avoiding the impact on the power grid and equipment during the switching process, improving the life and safety of equipment and lines, so the latter two Has become the current mainstream program. [0003] However, in the case of three-phase co-complementation, during the process of removing the capacito...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 李前军其他发明人请求不公开姓名
Owner 哈尔滨中创电气技术有限公司
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