Control system for combined electrode type electric boiler auxiliary frequency modulation of thermal power unit

Abstract

The application discloses a control system of a combined electrode type electric boiler auxiliary frequency modulation of a thermal power generating unit, and belongs to the technical field of thermal power generating unit control, and a specific scheme is as follows: the thermal power generating unit and the electrode type electric boiler jointly participate in auxiliary frequency modulation control, the electrode type electric boiler comprises a local operation mode and a remote operation mode, in the local operation mode, an electric boiler load instruction is set by an electric boiler monitor, in the remote operation mode, the electric boiler load instruction is issued by a thermal power generating unit control system, in a remote manual operation sub-mode, electric boiler power control right is controlled by a thermal power generating unit monitor, and in a remote automatic operation mode, electric boiler power is output by an electric boiler frequency modulation instruction logic loop, the application utilizes the load characteristics of the electrode type electric boiler, increases or decreases the power of the electrode type electric boiler to assist the thermal power generating unit to perform auxiliary frequency modulation, can improve the auxiliary frequency modulation performance of the thermal power generating unit, enhances the economy of the thermal power generating unit, and simultaneously widens the profit channel of the electric boiler system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of thermal power unit control, and particularly relates to a control system for combined electrode type electric boiler auxiliary frequency modulation of a thermal power unit. BACKGROUND

[0002] The electric boiler is also called electric heating boiler or electric heating boiler, which is a boiler device that converts electric power into heat energy and then converts the heat energy into steam, high-temperature water or organic heat carrier with certain heat energy. The application of electric boilers in thermal power units is mainly concentrated in the peak regulation service market. The business situation depends too much on local peak regulation compensation policies, and the profit means is single. In some regions where the peak regulation compensation policy is cancelled, there is a problem of resource waste and cost recovery difficulty for the built electric boiler system.

[0003] Considering that the power regulation speed of the electric boiler is above 20MW / min, and the power regulation speed of the thermal power unit is generally set to 3-6MW / min, therefore, the combined auxiliary frequency modulation of the thermal power unit and the electric boiler can improve the auxiliary frequency modulation performance of the thermal power unit, enhance the economy of the thermal power unit, and broaden the profit channel of the electric boiler system. Since the technical problem of combined auxiliary frequency modulation of the thermal power unit and the electric boiler has not been overcome, there is still a phenomenon of energy waste, which reduces the economy and practicability of the thermal power unit. SUMMARY

[0004] To solve the technical problems in the prior art, the present application provides a control system for combined electrode type electric boiler auxiliary frequency modulation of a thermal power unit, which can improve the auxiliary frequency modulation performance of the thermal power unit, improve the economy of the thermal power unit, and broaden the profit channel of the electric boiler system.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: the control system for combined electrode type electric boiler auxiliary frequency modulation of a thermal power unit, the thermal power unit and the electrode type electric boiler jointly participate in auxiliary frequency modulation control, and the specific implementation is as follows:

[0006] The electrode type electric boiler includes a local operation mode and a remote operation mode. In the local operation mode, the electric boiler load instruction is set by the electric boiler monitor; in the remote operation mode, the electric boiler load instruction is issued by the thermal power unit control system.

[0007] The local operation mode comprises a first soft keyboard module, a first analog quantity switching module, a first manual setting module and a first analog quantity input module. The first soft keyboard module is used for the electric boiler monitor to switch the local operation mode and the remote operation mode on the CRT picture. The first analog quantity switching module is used for selecting the signal source in different modes. The first manual setting module is used for the electric boiler monitor to manually set the electric boiler load on the CRT picture in the local operation mode. The first analog quantity input module is used for receiving the electric boiler load instruction issued by the thermal power unit in the remote operation mode.

[0008] The remote operation mode comprises a remote manual operation mode and a remote automatic operation mode. In the remote manual operation mode, the electric boiler load instruction is set by the thermal power unit monitor. In the remote automatic operation mode, the electric boiler load instruction is output by the electric boiler frequency modulation instruction logic loop.

[0009] In the remote operation mode, the second soft keyboard module, the second analog quantity switching module, the second manual setting module and the second analog quantity input module are included. The second soft keyboard module is used for the thermal power unit monitor to switch the remote manual mode and the remote automatic mode on the CRT picture. The second analog quantity switching module is used for selecting the signal source in different modes. The second manual setting module is used for the thermal power unit monitor to manually set the electric boiler load on the CRT picture in the remote manual mode. The second analog quantity input module is used for receiving the electric boiler load instruction output by the electric boiler frequency modulation instruction logic loop in the remote automatic mode.

[0010] The application further comprises an electric boiler power target value logic loop and an electric boiler power median regression logic loop.

[0011] The electric boiler power target value logic loop comprises a first subtraction module, a second subtraction module, a first high-low limit module, a third analog quantity switching module and a first addition module. The first subtraction module is used for calculating the current power of the thermal power unit minus the current power of the electric boiler to obtain the integrated power of the thermal power unit under the electric boiler operation of the power grid. The second subtraction module is used for calculating the power variation demand. The first high-low limit module is used for judging whether the power demand value reaches the need to put in the electric boiler. The third analog quantity switching module selects the power demand value which is judged by the first high-low limit module to need to put in the electric boiler. The first addition module is used for superimposing the power demand value and the current power value to finally obtain the power target value which the electric boiler needs to reach in the frequency modulation state.

[0012] The electric boiler power median regression logic circuit comprises a second high-low limit module, a delay trigger module, a third subtraction module, a fourth analog quantity switching module and a second addition module, the second high-low limit module is used for judging that a certain secondary frequency modulation node has ended and the unit is in a stable state, the delay trigger module is used for filtering signal fluctuation, the third subtraction module is used for calculating the difference between the current power of the electric boiler and the arithmetic average value of the electric boiler power, obtaining the electric boiler power median regression value, the fourth analog quantity switching module selects the electric boiler power median regression value when the unit does not participate in auxiliary frequency modulation, and the second addition module is used for superimposing the electric boiler power target value and the electric boiler power median regression value, so as to obtain the power instruction of the electric boiler when the electric boiler is in the median regression state.

[0013] The application also comprises a thermal power unit auxiliary frequency modulation power target value logic circuit, wherein a third addition module is arranged in the thermal power unit auxiliary frequency modulation power target value logic circuit, and the third addition module is used for superimposing the power instruction of the power grid auxiliary frequency modulation and the current power instruction of the electric boiler, so as to obtain the thermal power unit auxiliary frequency modulation power target value.

[0014] Compared with the prior art, the application has the following specific beneficial effects: the application provides a control system for electrode type electric boiler auxiliary primary frequency modulation of thermal power unit, the application uses the load characteristics of the electrode type electric boiler, increases or decreases the power of the electrode type electric boiler to assist the thermal power unit in auxiliary frequency modulation, improves the auxiliary frequency modulation performance of the thermal power unit, enhances the economy of the thermal power unit, and widens the profit channel of the electric boiler system. During the operation of the thermal power unit, the thermal power unit monitoring personnel and the electric boiler monitoring personnel can flexibly switch the local operation mode, the remote operation mode (remote manual operation mode and remote automatic operation mode) according to actual needs. In the local operation mode, the electric boiler power control right is controlled by the electric boiler monitoring personnel, and in the remote operation mode, the electric boiler power control right is controlled by the thermal power unit. In the remote manual operation mode, the electric boiler power control right is controlled by the thermal power unit monitoring personnel, and in the remote automatic operation mode, the electric boiler power is output by the electric boiler frequency modulation instruction logic circuit, and in the remote automatic operation mode, the power instruction of the thermal power unit is output by the thermal power unit auxiliary frequency modulation power target value logic circuit. In the remote automatic operation mode, when the power grid issues a frequency modulation instruction, the power instruction is respectively issued to the electric boiler and the thermal power unit through the electric boiler frequency modulation instruction logic circuit and the thermal power unit auxiliary frequency modulation power target value logic circuit, so as to jointly share the auxiliary frequency modulation task, and during the period without the power grid frequency modulation instruction, the electric boiler power median regression circuit automatically operates the electric boiler power to the power median, so as to ensure that the electric boiler has a power margin when participating in the next auxiliary frequency modulation. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The logic block diagram of the electrode type electric boiler in the local operation mode and the remote operation mode.

[0016] Figure 2 The logic block diagram of the electrode type electric boiler in the remote manual operation mode and the remote automatic operation mode.

[0017] Figure 3 The logic block diagram of the frequency modulation instruction of the electrode type electric boiler.

[0018] Figure 4 The logic block diagram of the target value of the auxiliary frequency modulation power of the electrode type thermal power unit.

[0019] In the figure, 1 is a first soft keyboard module, 2 is a first analog quantity switching module, 3 is a first manual setter module, 4 is a first analog quantity input module, 5 is a second soft keyboard module, 6 is a second analog quantity switching module, 7 is a second manual setter module, 8 is a second analog quantity input module, 9 is a first subtraction module, 10 is a second subtraction module, 11 is a first high-low limit module, 12 is a third analog quantity switching module, 13 is a first addition module, 14 is a second high-low limit module, 15 is a delay trigger module, 16 is a third subtraction module, 17 is a fourth analog quantity switching module, 18 is a second addition module, and 19 is a third addition module. DETAILED DESCRIPTION

[0020] In order to make the technical problems to be solved by the present application, the technical solutions and beneficial effects more clearly understood, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0021] As shown in the figure, the control system of the thermal power unit combined with the electrode type electric boiler for auxiliary frequency modulation, the thermal power unit and the electrode type electric boiler jointly participate in the auxiliary frequency modulation control, and the specific implementation is as follows: Figures 1-4 The electrode type electric boiler includes a local operation mode and a remote operation mode, in the local operation mode, the electric boiler load instruction is set by the electric boiler monitor; in the remote operation mode, the electric boiler load instruction is issued by the thermal power unit control system.

[0022]

[0023] ​The local operation mode comprises a first soft keyboard module 1, a first analog quantity switching module 2, a first manual setting module 3 and a first analog quantity input module 4. The first soft keyboard module 1 is used for the electric boiler monitor to switch the local operation mode and the remote operation mode on the CRT picture. The first analog quantity switching module 2 is used for selecting the signal source in the different modes. The first manual setting module 3 is used for the electric boiler monitor to manually set the electric boiler load on the CRT picture in the local operation mode. The first analog quantity input module 4 is used for receiving the electric boiler load instruction issued by the thermal power unit in the remote operation mode. The local instruction, the remote instruction and the electric boiler instruction are all input to the first analog quantity switching module 2, and the required operation mode is selected through the first soft keyboard module 1.

[0024] The remote operation mode comprises a remote manual operation mode and a remote automatic operation mode. In the remote manual operation mode, the electric boiler load instruction is set by the thermal power unit monitor. In the remote automatic operation mode, the electric boiler load instruction is output by the electric boiler frequency modulation instruction logic loop.

[0025] In the remote operation mode, a second soft keyboard module 5, a second analog quantity switching module 6, a second manual setting module 7 and a second analog quantity input module 8 are included. The second soft keyboard module 5 is used for the thermal power unit monitor to switch the remote manual mode and the remote automatic mode on the CRT picture. The second analog quantity switching module 6 is used for selecting the signal source in the different modes. The second manual setting module 7 is used for the thermal power unit monitor to manually set the electric boiler load on the CRT picture in the remote manual mode. The second analog quantity input module 8 is used for receiving the electric boiler load instruction output by the electric boiler frequency modulation instruction logic loop in the remote automatic mode. The remote manual instruction, the remote automatic instruction and the remote instruction are all input to the second analog quantity switching module 6, and the required operation mode is selected through the second soft keyboard module 5.

[0026] The application further comprises an electric boiler power target value logic loop and an electric boiler power median regression logic loop.

[0027] The electric boiler power target value logic loop comprises a first subtraction module 9, a second subtraction module 10, a first high-low limiting module 11, a third analog quantity switching module 12 and a first addition module 13, the power of the thermal power generating unit and the power of the electric boiler are input into the first subtraction module 9, the first subtraction module 9 is used for calculating the current power of the thermal power generating unit minus the current power of the electric boiler, so as to obtain the comprehensive power of the thermal power generating unit under the electric boiler operation shown by the power grid, the comprehensive power is combined with the secondary frequency modulation instruction to enter the second subtraction module 10, the second subtraction module 10 is used for calculating the power variation demand, and is input into the first high-low limiting module 11 and the third analog quantity switching module 12, the first high-low limiting module 11 is used for judging whether the power demand value reaches the need to put in the electric boiler, the third analog quantity switching module 12 selects the power demand value which is judged by the first high-low limiting module 11 as needing to put in the electric boiler, the power of the electric boiler is input into the first addition module 13, the first addition module 13 is used for superimposing the power demand value and the current power value, and finally the power target value of the electric boiler needing to be reached in the frequency modulation state is obtained.

[0028] The electric boiler power median regression logic loop comprises a second high-low limiting module 14, a delay trigger module 15, a third subtraction module 16, a fourth analog quantity switching module 17 and a second addition module 18, the second subtraction module 10 calculates the power variation demand and inputs into the second high-low limiting module 14, the second high-low limiting module 14 is used for judging that a certain secondary frequency modulation node has ended and the unit is in a stable state, the delay trigger module 15 is used for filtering signal fluctuation, the third subtraction module 16 is used for calculating the difference between the current power of the electric boiler and the arithmetic average value of the electric boiler power, so as to obtain the electric boiler power median regression value, the filtered signal is input into the fourth analog quantity switching module 17, the power of the electric boiler is input into the third subtraction module 16 to calculate the difference between the current power of the electric boiler and the arithmetic average value of the electric boiler power, and is input into the fourth analog quantity switching module 17, the fourth analog quantity switching module 17 selects the electric boiler power median regression value when the unit does not participate in auxiliary frequency modulation, and the second addition module 18 is used for superimposing the electric boiler power target value and the electric boiler power median regression value, so as to obtain the power instruction of the electric boiler when the electric boiler is in the median regression state.

[0029] The application also comprises a thermal power generating unit auxiliary frequency modulation power target value logic loop, the third addition module 19 is arranged in the thermal power generating unit auxiliary frequency modulation power target value logic loop, the secondary frequency modulation instruction and the power of the electric boiler are jointly input into the third addition module 19, the third addition module 19 is used for superimposing the power instruction of the auxiliary frequency modulation of the power grid and the current power instruction of the electric boiler, so as to obtain the thermal power generating unit auxiliary frequency modulation power target value.

[0030] The above only describes the preferred embodiments of the application and is not used to limit the application, and any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the scope of the application.

Claims

1. A control system for auxiliary frequency regulation of a thermal power unit combined with an electrode-type electric boiler, characterized in that, Thermal power units and electrode-type electric boilers jointly participate in auxiliary frequency regulation control, as detailed below: Electrode-type electric boilers include local operation mode and remote operation mode. In local operation mode, the load command of the electric boiler is set by the electric boiler monitoring personnel; in remote operation mode, the load command of the electric boiler is issued by the thermal power unit control system. The local operation mode includes a first soft keyboard module (1), a first analog quantity switching module (2), a first manual setter module (3), and a first analog quantity input module (4). The first soft keyboard module (1) is used by the electric boiler monitor to switch between the local operation mode and the remote operation mode on the CRT screen. The first analog quantity switching module (2) is used to select the signal source in different modes. The first manual setter module (3) is used by the electric boiler monitor to manually set the electric boiler load on the CRT screen in the local operation mode. The first analog quantity input module (4) is used to receive the electric boiler load command issued by the thermal power unit in the remote operation mode. The remote operation mode includes a remote manual operation mode and a remote automatic operation mode. In the remote manual operation mode, the load command of the electric boiler is set by the monitoring personnel of the thermal power unit. In the remote automatic operation mode, the load command of the electric boiler is output by the electric boiler frequency regulation command logic circuit. In the remote operation mode, it includes a second soft keyboard module (5), a second analog quantity switching module (6), a second manual setter module (7), and a second analog quantity input module (8). The second soft keyboard module (5) is used by the thermal power unit monitoring personnel to switch between remote manual mode and remote automatic mode on the CRT screen. The second analog quantity switching module (6) is used to select the signal source in different modes. The second manual setter module (7) is used by the thermal power unit monitoring personnel to manually set the electric boiler load on the CRT screen in the remote manual mode. The second analog quantity input module (8) is used to receive the electric boiler load command output by the electric boiler frequency modulation command logic circuit in the remote automatic mode. This includes the target power value logic loop for electric boilers and the median power regression logic loop for electric boilers; The power target value logic circuit of the electric boiler includes a first subtraction module (9), a second subtraction module (10), a first high and low limit module (11), a third analog quantity switching module (12), and a first addition module (13). The first subtraction module (9) is used to calculate the current power of the thermal power unit minus the current power of the electric boiler to obtain the comprehensive power of the thermal power unit under the operation of the electric boiler displayed by the power grid. The second subtraction module (10) is used to calculate the power change demand. The first high and low limit module (11) is used to determine whether the power demand value has reached the point where the electric boiler needs to be put into operation. The third analog quantity switching module (12) selects the power demand value that the first high and low limit module (11) determines as the point where the electric boiler needs to be put into operation. The first addition module (13) is used to superimpose the power demand value with the current power value to finally obtain the power target value that the electric boiler needs to achieve in the frequency regulation state. The power median regression logic loop of the electric boiler includes a second high and low limit module (14), a delay trigger module (15), a third subtraction module (16), a fourth analog quantity switching module (17), and a second addition module (18). The second high and low limit module (14) is used to determine that a certain secondary frequency regulation node has ended and the unit is in a stable state. The delay trigger module (15) is used to filter signal fluctuations. The third subtraction module (16) is used to calculate the difference between the current power of the electric boiler and the arithmetic mean of the power of the electric boiler to obtain the power median regression value of the electric boiler. The fourth analog quantity switching module (17) selects the power median regression value of the electric boiler when the unit does not participate in auxiliary frequency regulation. The second addition module (18) is used to superimpose the power target value of the electric boiler and the power median regression value of the electric boiler to obtain the power command of the electric boiler when the electric boiler is in the median regression state.

2. The control system for auxiliary frequency regulation of a thermal power unit combined with an electrode-type electric boiler according to claim 1, characterized in that, The logic circuit for the auxiliary frequency regulation power target value of thermal power unit is included. A third addition module (19) is provided in the logic circuit for the auxiliary frequency regulation power target value of thermal power unit. The third addition module (19) is used to calculate the superposition of the power grid auxiliary frequency regulation power command and the current power command of the electric boiler to obtain the auxiliary frequency regulation power target value of thermal power unit.

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