Grid-connected frequency acquisition and control optimization device for intermediate storage type pulverized coal boiler

Abstract

A grid-connected frequency acquisition and control optimization device for a middle storage type pulverized coal boiler comprises a data acquisition module, a redundant data processing module, a control cabinet, an uninterruptible power supply module and a man-machine interaction module, and the data acquisition module is composed of two AD analog quantity modules; the redundant data processing module is formed by connecting an autonomous controllable IS20 series PLC (Programmable Logic Controller) and a MODBUS TCP (Transmission Control Protocol) communication module through a serial port connecting line; the uninterruptible power supply module is composed of two redundant 220VAC to 24VDC power supply modules; the man-machine interaction module is formed by connecting a display, a drawer type keyboard and an industrial control computer through a power line and an external cable; according to the grid-connected frequency acquisition and control optimization device for the intermediate storage type pulverized coal boiler, a multi-dimensional frequency modulation optimization means is combined, the qualification rate of primary frequency modulation action is maximized, accurate and reliable action signals of a unit can be ensured by acquiring frequency signals of a power grid, and on the basis of the multi-dimensional optimization means, the efficiency of the unit is improved. And it can be effectively ensured that primary frequency modulation dynamic adjustment integral electric quantity meets assessment standard requirements.

Description

Technical Field

[0001] This utility model relates to the field of frequency control optimization for coal-fired power units, specifically a device for acquiring and optimizing the grid connection frequency of a medium-storage pulverized coal boiler. Background Technology

[0002] According to the classification of pulverizing system, coal-fired boilers can be divided into two categories: direct-fired and intermediate-storage type. The intermediate-storage type directly transports the ground coal powder to the furnace for combustion through the pulverizer, and its load response rate is faster. Based on this, a higher precision method should be adopted for the grid connection frequency control of this type of unit.

[0003] Traditional coal-fired power units often use speed probe signals as the basis for grid-connected frequency response. However, due to the limitations of speed probe sampling accuracy, high-precision frequency resolution cannot be achieved. For example, 0.1 rpm (of a typical speed probe) corresponds to a frequency value of 0.0016 Hz, which cannot achieve a precise frequency transmission of 0.001 Hz. This leads to certain erroneous frequency correction actions during speed changes. If the unit parameters are not set reasonably, the frequency regulation response will be poor, and the corresponding increase in unnecessary adjustments will require the company to bear a greater economic burden, significantly reducing the company's profitability. At the same time, the reliable support for the power grid cannot be effectively guaranteed. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a medium-storage pulverized coal boiler grid-connected frequency acquisition and control optimization device. This device uses the grid frequency as the primary frequency regulation adjustment signal and combines multi-dimensional frequency regulation optimization methods to maximize the primary frequency regulation operation qualification rate. Signal synchronization is crucial for primary frequency regulation assessment. By acquiring the grid frequency signal, the accuracy and reliability of the unit's operation signal can be ensured. Based on multi-dimensional optimization methods, the device can effectively ensure that the integral power of the primary frequency regulation dynamic adjustment meets the assessment standard requirements.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a grid-connected frequency acquisition and control optimization device for a medium-storage pulverized coal boiler, comprising a data acquisition module, a redundant data processing module, a control cabinet, an uninterruptible power supply module, and a human-machine interaction module. The data acquisition module consists of two analog input / output (AD) modules; the redundant data processing module consists of a domestically developed and controllable IS20 series PLC and a MODBUS TCP communication module connected via a serial port cable; the uninterruptible power supply module consists of two redundant 220VAC to 24VDC power supply modules; and the human-machine interaction module consists of a display, a drawer-type keyboard, and an industrial control computer connected via power cords and peripheral cables.

[0006] Preferably, the control cabinet consists of a front A and a back B, with the front being a transparent glass door and the back being a painted steel plate door; the B side of the control cabinet is equipped with circuit breakers, each with a diameter of 2.5mm. 2 The cable connects to the power strip and the input terminal block, 2.5mm. 2 The cable is then connected to the uninterruptible power supply module via the incoming terminal block to achieve redundant power supply.

[0007] Preferably, the redundant data processing module can analyze the PT and CT secondary signals acquired by the data acquisition module based on high-speed Fourier transform, and then obtain the real-time frequency of the unit's grid connection point, with a resolution of 0.001Hz.

[0008] Preferably, the human-machine interaction module is developed using the SC-PROVIEW independently controllable PLC platform, which can display frequency and load compensation trends in real time, and is designed with multiple user login permissions, allowing different login accounts to exercise different operating permissions.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] This invention uses the power grid frequency as the adjustment signal for primary frequency regulation, and combines multi-dimensional frequency regulation optimization methods to maximize the pass rate of primary frequency regulation. Signal synchronization is the key to primary frequency regulation assessment. By collecting the power grid frequency signal, the accuracy and reliability of the unit's action signal can be ensured. Based on multi-dimensional optimization methods, it can effectively ensure that the integral power of the primary frequency regulation dynamic adjustment meets the assessment standard requirements. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] The attached diagram lists the components represented by each number as follows:

[0013] Display, 1-1-RJ45 Ethernet interface, 1-2-AO output interface, 2-Independent controllable PLC controller, 2-Drawer-type keyboard, 3-Industrial control computer, 4-Metal guide rail, 5-Uninterruptible power supply module, 6-1-Incoming terminal block, 6-2-Outgoing terminal block, 7-1-IS20 controller, 7-2-AD analog module, 7-3-MODBUS TCP communication module, 7-4-Serial port connection cable, 8-1-Circuit breaker upper port, 8-2-Circuit breaker lower port, 9-1-Circuit breaker upper port, 9-2-Circuit breaker lower port, 10-2.5mm² cable. Detailed Implementation

[0014] The specific implementation method of this utility model is as follows: (Refer to...) Figure 1A medium-storage pulverized coal boiler grid-connected frequency acquisition and control optimization device includes a data acquisition module, a redundant data processing module, a control cabinet, an uninterruptible power supply module, and a human-machine interaction module. The data acquisition module consists of two AD analog quantity modules (7-2); the redundant data processing module consists of an independently controllable IS20 series PLC (7-1) and a MODBUS TCP communication module (7-3) connected via a serial port connection cable (7-4); the uninterruptible power supply module (5) consists of two redundant 220VAC to 24VDC power supply modules; and the human-machine interaction module consists of a display (1), a drawer-type keyboard (2), and an industrial control computer (3) connected via power cords and peripheral cables.

[0015] Reference Figure 1 Preferably, the control cabinet consists of a front A and a back B, with the front being a transparent glass door and the back being a painted steel plate door; the B side of the control cabinet is equipped with circuit breakers (8-1) and (9-1), each with a diameter of 2.5mm. 2 Cable (10) connects to the power strip and the incoming terminal block (6-1), 2.5mm. 2 The cable (10) is then connected to the uninterruptible power supply module (5) via the incoming terminal block (6-1) to achieve redundant power supply;

[0016] Reference Figure 1 Preferably, the redundant data processing module can analyze the PT and CT secondary signals acquired by the data acquisition module based on high-speed Fourier transform, and then obtain the real-time frequency of the unit's grid connection point, with a resolution of 0.001Hz.

[0017] Reference Figure 1 Preferably, the human-machine interaction module is developed using the SC-PROVIEW independently controllable PLC platform, which can display frequency and load compensation trends in real time, and is designed with multiple user login permissions, allowing different login accounts to exercise different operating permissions.

Claims

1. A grid-connected frequency acquisition and control optimization device for a medium-storage pulverized coal boiler, comprising a data acquisition module, a redundant data processing module, a control cabinet, an uninterruptible power supply module, and a human-machine interaction module, characterized in that: The data acquisition module consists of two analog input / output (A / D) modules (7-2); the redundant data processing module consists of an independently controllable IS20 series PLC (7-1) and a MODBUS TCP communication module (7-3) connected via a serial port cable (7-4); the uninterruptible power supply module (5) consists of two redundant 220VAC to 24VDC power supply modules; the human-machine interaction module consists of a display (1), a drawer-type keyboard (2), and an industrial control computer (3) connected via power cords and peripheral cables.

2. The grid-connected frequency acquisition and control optimization device for a medium-storage pulverized coal boiler according to claim 1, characterized in that: The control cabinet consists of a front A and a back B. The front is a transparent glass door, and the back is a painted steel plate door. The B side of the control cabinet is equipped with circuit breakers (8-1) and (9-1), each with a diameter of 2.5mm. 2 Cable (10) connects to the power strip and the incoming terminal block (6-1), 2.5mm. 2 The cable (10) is then connected to the uninterruptible power supply module (5) via the incoming terminal block (6-1) to achieve redundant power supply.

3. The grid-connected frequency acquisition and control optimization device for a medium-storage pulverized coal boiler according to claim 1, characterized in that: The redundant data processing module can analyze the PT and CT secondary signals acquired by the data acquisition module based on high-speed Fourier transform, and then obtain the real-time frequency of the unit's grid connection point, with a resolution of 0.001Hz.

4. The grid-connected frequency acquisition and control optimization device for a medium-storage pulverized coal boiler according to claim 1, characterized in that: The human-machine interaction module is developed using the SC-PROVIEW self-controllable PLC platform. It can display frequency and load compensation trends in real time and is designed with multiple user login permissions, allowing different login accounts to exercise different operating permissions.

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