Secondary transformation device for operation of generator to phase modifier

Abstract

A secondary modification device for operation of a generator modification camera comprises a generator connected with a main transformer and a factory high-voltage transformer, the generator is connected with an excitation transformer, and the excitation transformer is connected with an excitation transformer differential protection circuit and an excitation transformer overcurrent protection circuit. The excitation transformer differential protection circuit and the excitation transformer over-current protection circuit are arranged in an excitation adjusting cabinet. The excitation adjusting cabinet is also internally provided with a tripping field suppression switch and an inversion field suppression switch. The generator is further connected with an SFC control cabinet, and a jump SFC switch is arranged in the SFC control cabinet. The generator is also connected with a phase modifier starting differential protection circuit, a phase modifier starting overcurrent protection circuit, a phase modifier starting zero sequence overvoltage protection circuit and a phase modifier low voltage splitting protection circuit. According to the utility model, the existing traditional coal-fired power generation unit is improved, so that the coal-fired power generation unit has the generator operation function and the phase modifier operation function at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to a generator modification phase modifier operation secondary reformation device. BACKGROUND

[0002] At present, the current situation before the secondary system reformation of the generator modification phase modifier operation is:

[0003] The generator-transformer group protection device includes: the present microcomputer type generator-transformer group protection screen three faces, respectively, the electric quantity protection screen A, the electric quantity protection screen B and the non-electric quantity protection screen, the supply factory is Xuji Electrical, adopts WFB-800 series device.

[0004] The synchronizing device includes: the present synchronizing screen one face of the power plant no. 2 unit, adopts Shenzhen intelligence SID-2FY device, and the synchronizing point is the high voltage side breaker of the main transformer.

[0005] The direct current and UPS system includes: the power plant no. 1 and no. 2 unit each is equipped with 1 set of 220V control and power direct current power supply system (single group battery), and the battery capacity is 2000Ah. The public section is arranged between the direct current systems of the two units, and is used to supply the public direct current load. In addition, the power plant no. 1 and no. 2 unit each is equipped with 1 set of UPS power supply system, and is provided with a battery pack. The UPS host capacity is 80kVA, and the supply factory is Emerson. The public section is arranged between the UPS of the two units, and is used to supply the public UPS load. However, the existing configuration of the direct current system does not meet the configuration standard of 3.3.3 of "Technical Regulation for Design of Direct Current Power Supply System of Electric Power Engineering" (DL / T5044-2014): "3 for the 300MW level unit of single machine capacity, the thermal power plant of each unit is equipped with 3 groups of batteries, wherein 2 groups are used to supply the control load, and 1 group is used to supply the power load, or 2 groups of batteries for control load and power load combined power supply can be installed." In addition, the existing configuration of the UPS meets the configuration standard of "Technical Regulation for Design of AC Uninterruptible Power Supply System of Electric Power Engineering" (DL / T5491-2014), but does not meet the provisions of "8.1.8 each set of UPS is equipped with two independent UPSs, which are used as backup" in "Technical Guide for Synchronous Phase Modifier Control Protection System".

[0006] The AVC, fault recording device and other devices include: the power plant no. 2 unit is equipped with 1 face of fault recording screen, 1 face of AVC control cabinet, 1 set of time synchronization system, 1 set of synchronous phasor measurement system (PMU), 1 set of transmitter screen and 1 set of electric meter screen, which are arranged in the electronic room, and the remote screen cabinet is arranged in the relay room of the network control building of the booster station.

[0007] The generator excitation system comprises: the existing excitation system of the No.2 unit generator of the power plant is an ABB UNITROL6800 type static thyristor excitation system assembled and produced by Shanghai Power Equipment Complete Design Research Institute Co., Ltd., and the specific type is T6S-O / U241-S6000; the equipment was completed in the transformation in 2013 and has been in stable operation since then. The low-voltage side voltage of the existing excitation system is 650V, which cannot meet the requirements of 3.5 times rated excitation voltage, 2.5 times rated excitation current and 15 seconds of strong excitation of the phase-modulating machine. Content of the utility model

[0008] The utility model solves the technical problems of the existing generator transformation and phase-modulating machine operation secondary system, and provides a generator transformation and phase-modulating machine operation secondary transformation device.

[0009] The technical scheme of the utility model is specifically as follows:

[0010] The generator transformation and phase-modulating machine operation secondary transformation device comprises a generator connected with a main transformer and a plant high-voltage transformer, wherein the generator is connected with an excitation transformer, the excitation transformer is connected with an excitation transformer differential protection circuit and an excitation transformer overcurrent protection circuit, the excitation transformer differential protection circuit and the excitation transformer overcurrent protection circuit are arranged in an excitation regulation cabinet, and a trip de-excitation switch and an inverter de-excitation switch are further arranged in the excitation regulation cabinet; the generator is further connected with an SFC control cabinet, and a trip SFC switch is arranged in the SFC control cabinet.

[0011] The generator is further connected with a phase-modulating machine starting differential protection circuit, a phase-modulating machine starting overcurrent protection circuit, a phase-modulating machine starting zero-sequence overvoltage protection circuit and a phase-modulating machine low-voltage split protection circuit.

[0012] The generator is connected with at least two direct-current power supply systems.

[0013] The generator is connected with a UPS power supply system.

[0014] The generator is provided with mode buttons, including a generator operation mode button and a phase-modulating machine operation mode button, and the generator operation mode button and the phase-modulating machine operation mode button are arranged in an electrical control system DCS.

[0015] The generator is connected with a voltage transmitter and a current transmitter, and the voltage transmitter and the current transmitter are connected with the electrical control system DCS.

[0016] The utility model discloses the beneficial effect has the following several advantages: the traditional coal-fired generator unit of current is reformed, and it has the generator operation function and the phase modifier operation function simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The protection configuration diagram of generator modification phase modifier operation secondary reconstruction device;

[0018] Figure 2 The cooperation interface diagram of generator modification phase modifier operation secondary reconstruction device and SFC;

[0019] Figure 3 The AVC system wiring reconstruction diagram of generator modification phase modifier operation. DETAILED DESCRIPTION

[0020] The technical schemes in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the range of the utility model protection.

[0021] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like is the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it can not be understood as the limitation of the utility model.

[0022] As Figure 1 , Figure 2As shown in the figure, the generator is modified to operate the phase modifier, and the modification device comprises a generator 1 connected with a main transformer and a plant high transformer, the generator 1 is connected with an excitation transformer 2, the excitation transformer 2 is connected with an excitation transformer differential protection circuit 3 and an excitation transformer overcurrent protection circuit 4; the excitation transformer differential protection circuit 3 and the excitation transformer overcurrent protection circuit 4 are both arranged in an excitation adjustment cabinet, and a trip de-excitation switch KG1 and an inverter de-excitation switch KG3 are also arranged in the excitation adjustment cabinet; the generator is also connected with an SFC control cabinet, and a trip SFC switch KG2 is arranged in the SFC control cabinet, and the excitation adjustment cabinet and the SFC control cabinet are used for adjusting and monitoring the operating state of the generator and the operating state of the phase modifier.

[0023] As shown in the figure, Figure 1 The generator 1 is also connected with a phase modifier starting differential protection circuit 5, a phase modifier starting overcurrent protection circuit 6, a phase modifier starting zero sequence overvoltage protection circuit 7 and a phase modifier low-voltage splitting protection circuit 8.

[0024] It should be noted that each protection circuit here is an existing circuit, which can be a protection plug-in, and the utility model is connected to the protection end of the generator, thereby meeting the requirements in the Technical Guidelines for Synchronous Phase Modulator Control and Protection System.

[0025] Further, when the generator 1 is used as a phase modifier, the generator 1 is connected with at least two DC power supply systems, and the DC power supply system is the original equipment, that is, the phase modifier DC load is changed to take power from the #1 DC power supply system and the #2 DC power supply system respectively, so as to meet the design requirement of dualization of part of the DC load power supply.

[0026] Further, when the generator 1 is used as a phase modifier, the generator 1 is connected with a UPS power supply system, and the UPS power supply system is the original equipment.

[0027] Further, as shown in the figure, Figure 3 The generator 1 is provided with mode buttons, including a generator operation mode button YB01 and a phase modifier operation mode button YB02, and the generator operation mode button YB01 and the phase modifier operation mode button YB02 are arranged in the electrical control system DCS.

[0028] Further, the generator 1 is connected with a voltage transmitter and a current transmitter, and the voltage transmitter and the current transmitter are connected with the electrical control system DCS.

[0029] Since the starting system adopts SFC frequency conversion starting, the excitation system also needs to increase starting excitation transformer and switching switch. The upgraded excitation system should meet the relevant performance requirements of the standards such as "Technical Specification for Grid Phase Modulator Equipment (Trial)" and "Technical Guidelines for Synchronous Phase Modulator Control and Protection System".

[0030] The upgraded excitation system considers the original position arrangement or the 12m platform arrangement of the unit.

[0031] The above only describes the preferred embodiments of the present application, and it should be pointed out that for those skilled in the art, without departing from the overall concept of the present application, some changes and improvements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A generator-to-synchronizer secondary modification device, characterized in that: The generator (1) is connected with the main transformer and the plant high transformer, the generator (1) is connected with the excitation transformer (2), the excitation transformer (2) is connected with the excitation transformer differential protection circuit (3) and the excitation transformer over-current protection circuit (4), the excitation transformer differential protection circuit (3) and the excitation transformer over-current protection circuit (4) are arranged in the excitation regulation cabinet, the excitation regulation cabinet is further provided with the trip magnetic breaker (KG1) and the inverse magnetic breaker (KG3), the generator is further connected with the SFC control cabinet, the SFC control cabinet is provided with the trip SFC switch (KG2). The generator (1) is further connected with the phase modifier start-up differential protection circuit (5), the phase modifier start-up over-current protection circuit (6), the phase modifier start-up zero sequence over-voltage protection circuit (7) and the phase modifier low-voltage split protection circuit (8).

2. The generator-retrofit phase modifier operational retrofit device of claim 1, wherein: The generator (1) is connected with at least two DC power supply systems.

3. The generator-retrofit phase modifier operational retrofit device of claim 1, wherein: The generator (1) is connected with the UPS power supply system.

4. The generator-retrofit phase modifier operational retrofit device of claim 1, wherein: The generator (1) is provided with mode buttons, including the generator operation mode button (YB01) and the phase modifier operation mode button (YB02), the generator operation mode button (YB01) and the phase modifier operation mode button (YB02) are arranged in the electrical control system DCS.

5. The generator-retrofit phase modifier operational retrofit device of claim 1, wherein: The generator (1) is connected with the voltage transmitter and the current transmitter, the voltage transmitter and the current transmitter are connected with the electrical control system DCS.

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