Primary frequency modulation optimization control system

Abstract

The utility model discloses a primary frequency modulation optimization control system, which comprises a network frequency signal acquisition device, an optimization controller, a power supply module, an upper computer and a switch which are arranged in a cabinet, and the output end of the power supply module is respectively connected with the power supply input ends of the network frequency signal acquisition device, the optimization controller, the upper computer and the switch. The output end of the network frequency signal acquisition device is connected with the input end of the optimization controller, and the optimization controller is electrically connected with the thermal power generating unit DCS control system and the upper computer through the switch. The network frequency signal acquisition device acquires frequency signals synchronous with a power grid, the optimization controller generates a primary frequency modulation optimization instruction according to logic design frequency difference signals, and primary frequency modulation performance indexes including a 15-second output response index, a 30-second output response index and an electric quantity contribution index of a unit are calculated in real time. And secondary correction is performed on the primary frequency modulation control instruction according to the real-time performance index, so that the primary frequency modulation performance index of the unit is improved, and primary frequency modulation assessment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal power plant control, and more specifically to a primary frequency modulation optimization control system. Background Art

[0002] The imbalance between power consumption load and power generation is the main cause of power grid frequency fluctuations. Excessive power grid frequency fluctuations will not only cause harm to user equipment, but also pose a major danger to the units connected to the grid. Therefore, when the power grid frequency fluctuates, the units connected to the grid should promptly change their power to balance the power consumption load. Relying on the primary frequency modulation function of the grid-connected units, in the new situation of smart grids such as large-scale access of new energy and ultra-high voltage interconnection, higher requirements are put forward for the frequency modulation and peak shaving capabilities of conventional thermal power units, which are the main force for power grid frequency modulation.

[0003] According to the requirements of the "Two Rules", primary frequency modulation belongs to the basic auxiliary service that power generation units must provide to ensure the safe and stable operation of the power system and the quality of electric energy. When a grid-connected power plant fails to provide the basic auxiliary service due to its own reasons, it needs to be evaluated. The three main evaluation indicators for the primary frequency modulation performance of grid-connected thermal power units are: 15-second output response index, 30-second output response index, and integral power contribution index. The power grid evaluates the unqualified performance of the unit's primary frequency modulation on a monthly basis, and currently, each power generation enterprise faces different degrees of primary frequency modulation evaluation.

[0004] The primary frequency modulation function of traditional thermal power units is realized through the combined action of two parts. The unit coordinated control system (CCS) and the turbine electro-hydraulic control system (DEH) work together. The reference signal adopted by the generator set is the turbine speed signal, while the power grid dispatching uses the power grid frequency signal for the evaluation of primary frequency modulation. When the grid frequency exceeds the frequency modulation dead zone, a frequency modulation load command is formed through a designed frequency difference function to correct the unit load command. At the same time, a comprehensive flow increment command is formed and superimposed on the total command of the turbine comprehensive valve position to ensure the rapidity of primary frequency modulation. Due to the accuracy deviation of the unit speed signal and the non-synchronization with the change of the power grid frequency, a large number of primary frequency modulation evaluations are caused; moreover, because the performance indicators of the unit's primary frequency modulation cannot be understood in real time, the thermal power generation enterprise needs to wait for the evaluation data released by the power grid enterprise before it can query the historical data of the unit according to the evaluation data, find the reasons for the evaluation, and carry out logic optimization, resulting in the lag and low efficiency of the primary frequency modulation optimization work. Therefore, it is necessary to provide a primary frequency modulation optimization control system based on real-time performance index calculation. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a primary frequency modulation optimization control system to improve the primary frequency modulation performance index of the unit and the evaluation efficiency.

[0006] To solve the above technical problems, the technical solutions adopted by the present utility model are as follows.

[0007] A primary frequency regulation optimization control system includes a network frequency signal acquisition device arranged in a cabinet for acquiring high-precision power grid frequency signals homologous to PMU, an optimization controller for comparing the acquired network frequency signals with a preset network frequency signal standard value, a power supply module for providing a power supply, a host computer for realizing primary frequency regulation parameter control, and a switch for signal transmission. The output end of the power supply module is respectively connected to the power input ends of the network frequency signal acquisition device, the optimization controller, the host computer, and the switch. The output end of the network frequency signal acquisition device is connected to the input end of the optimization controller. The optimization controller is electrically connected to the DCS control system of the thermal power unit and the host computer through the switch respectively.

[0008] In a further optimized technical solution, the optimization controller, the network frequency signal acquisition device, and the host computer are respectively connected to the switch through industrial Ethernet cables, and the DCS control system of the thermal power unit is connected to the switch through an industrial Ethernet cable.

[0009] In a further optimized technical solution, a host computer display for displaying primary frequency regulation parameter control information is further arranged in the cabinet, and the input end of the host computer display is connected to the output end of the host computer.

[0010] In a further optimized technical solution, the optimization controller, the network frequency signal acquisition device, and the host computer are all fixed in the cabinet through a backplane guide rail.

[0011] In a further optimized technical solution, the power supply module adopts two-way UPS uninterruptible power supplies.

[0012] In a further optimized technical solution, the host computer is an industrial control computer.

[0013] In a further optimized technical solution, the cabinet is formed by bending high-quality cold-rolled steel plates.

[0014] Due to the adoption of the above technical solutions, the technical progress achieved by the present utility model is as follows.

[0015] A primary frequency regulation optimization control system provided by the present utility model acquires frequency signals synchronized with the power grid through a network frequency signal acquisition device. The optimization controller generates a primary frequency regulation optimization instruction according to the logic-designed frequency difference signal, and simultaneously calculates the 15-second output response index, 30-second output response index, and power contribution index of the unit's primary frequency regulation performance index in real time. And the primary frequency regulation control instruction is secondarily corrected according to the real-time performance index, improving the unit's primary frequency regulation performance index, reducing the primary frequency regulation assessment, and improving the efficiency of the assessment. Description of the Drawings

[0016] Figure 1Structural schematic diagram of the present utility model;

[0017] Figure 2 Topological schematic diagram of the present utility model.

[0018] Wherein: 1. Cabinet, 2. Power module, 3. Optimization controller, 4. Network frequency signal acquisition device, 5. Switch, 6. Host computer display, 7. Host computer. Specific embodiments

[0019] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] A primary frequency modulation optimization control system, in combination with Figure 1 As shown, it includes a cabinet 1. Inside the cabinet 1, there are arranged a network frequency signal acquisition device 4, an optimization controller 3, a power module 2, a host computer 7 and a switch 5. The output ends of the power module are respectively connected to the power input ends of the network frequency signal acquisition device, the optimization controller, the host computer and the switch. The output end of the network frequency signal acquisition device is connected to the input end of the optimization controller. The optimization controller is electrically connected to the DCS control system of the thermal power unit and the host computer through the switch respectively. Its topological structure schematic diagram is as Figure 2 Shown.

[0021] The network frequency signal acquisition device 4, the optimization controller 3 and the host computer 7 are all fixed in the cabinet 1 through the backplane guide rails. The network frequency signal acquisition device 4, the optimization controller 3 and the host computer 7 are respectively connected to the switch 5 through industrial Ethernet cables, and the TCP / IP protocol is used to realize data transmission; the DCS control system of the thermal power unit is connected to the switch through an industrial Ethernet cable, and the MODBUS TCP / IP protocol is used to realize data transmission with the optimization controller. The communication signals include AGC instructions, unit load instructions, actual generated power of the unit, main steam pressure, main steam temperature, high-pressure exhaust pressure, high-pressure exhaust temperature, regulating stage pressure, DEH valve position instructions, DCS primary frequency modulation instructions, optimization control system heartbeat signals, primary frequency modulation lock-increase signals, primary frequency modulation lock-decrease signals, optimization control system input signals, primary frequency modulation optimization control instructions, etc.

[0022] The network frequency signal acquisition device 4 is used to collect high-precision power grid frequency signals homologous to the PMU, with a frequency measurement accuracy of 0.001 Hz. The network frequency signal acquisition device adopts a redundant configuration, using two or three network frequency signal acquisition devices. The collected frequency signals are communicated to the optimization controller for optimization and then participate in the primary frequency modulation optimization control.

[0023] The optimization controller 3 adopts a redundant process controller. The redundant controller can realize master-slave switching. When the master controller fails, the standby controller automatically takes over the control task to ensure the continuous operation of the system; the optimization controller can adopt a DCS controller or a PLC controller, and a millisecond-level controller is used.

[0024] The optimization controller generates a primary frequency regulation optimization command according to the logic-designed frequency difference signal. At the same time, it calculates the 15-second output response index, 30-second output response index, and power contribution index of the unit's primary frequency regulation performance in real time, and makes a secondary correction to the primary frequency regulation control command according to the real-time performance index, improving the unit's primary frequency regulation performance index and reducing the primary frequency regulation assessment.

[0025] The upper computer 7 uses an industrial control computer to communicate with the optimization controller using the TCP / IP protocol. The industrial control computer installs DCS configuration software or PLC configuration software to realize the configuration modification, data storage, data management, data display, communication control, historical statistics, and alarm prompt of the primary frequency regulation optimization control logic and the primary frequency regulation performance parameter calculation logic.

[0026] An upper computer display 6 is also set in the cabinet 1 to display the primary frequency regulation parameter control information. The input end of the upper computer display is connected to the output end of the upper computer.

[0027] The power supply module 2 uses a redundant power supply module. The power supply uses two-way UPS uninterruptible power supply, or one-way plant power and one-way UPS power. The failure of any one power supply module does not affect the power supply of the cabinet.

[0028] The cabinet 1 is formed by bending high-quality cold-rolled steel plates. The thickness of the steel plate is 2 mm, and it is formed by welding connection. The cabinet door is an external hanging type, made of high-quality cold-rolled steel plates or organic glass. The side door of the cabinet is an external hanging type, made of high-quality cold-rolled steel plates. A sealing strip is laid between the cabinet frame and the cabinet door and side door to ensure the sealing performance of the cabinet, and the protection level is IP54.

[0029] When the utility model is working, the network frequency signal acquisition device acquires the power grid frequency signal homologous to the PMU and sends it to the optimization controller. The optimization controller compares the acquired same-frequency signal with the preset network frequency signal standard value. When the network frequency signal exceeds the specified dead zone, it generates a primary frequency regulation control command according to the set control logic and sends it to the unit DCS control system. At the same time, the optimization controller calculates the 15-second output response index, 30-second output response index, and power contribution index of the unit's primary frequency regulation performance according to the actual power signal fed back by the unit. And it makes a secondary correction to the primary frequency regulation control command according to the real-time performance index, improving the unit's primary frequency regulation performance index and reducing the primary frequency regulation assessment.

Claims

1. An optimized primary frequency regulation control system, characterized in that: It includes a network frequency signal acquisition device (4) arranged in a cabinet (1) for acquiring high-precision power grid frequency signals homologous to the PMU, an optimization controller (3) for comparing the acquired network frequency signals with a preset standard value of the network frequency signals, a power supply module (2) for providing a power supply, a host computer (7) for implementing primary frequency modulation parameter control, and a switch (5) for signal transmission. The output end of the power supply module is respectively connected to the power input ends of the network frequency signal acquisition device, the optimization controller, the host computer, and the switch. The output end of the network frequency signal acquisition device is connected to the input end of the optimization controller. The optimization controller is electrically connected to the DCS control system of the thermal power unit and the host computer respectively through the switch.

2. The primary frequency regulation optimization control system according to claim 1, wherein: The optimization controller (3), the network frequency signal acquisition device (4), and the host computer (7) are respectively connected to the switch (5) through industrial Ethernet cables. The DCS control system of the thermal power unit is connected to the switch through an industrial Ethernet cable.

3. The primary frequency regulation optimization control system according to claim 1, wherein: A host computer display (6) for displaying primary frequency modulation parameter control information is also arranged in the cabinet (1). The input end of the host computer display is connected to the output end of the host computer.

4. An optimized primary frequency regulation control system according to claim 1, characterized in that: The optimization controller (3), the network frequency signal acquisition device (4), and the host computer (7) are all fixed in the cabinet (1) through backplane rails.

5. The primary frequency regulation optimization control system according to claim 1, wherein: The power supply module (2) adopts two-way UPS uninterruptible power supplies.

6. The primary frequency regulation optimization control system according to claim 1, wherein: The host computer (7) is an industrial control computer.

7. An optimized primary frequency regulation control system according to claim 1, characterized in that: The cabinet (1) is formed by bending high-quality cold-rolled steel plates.

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