A coal-fired power plant auxiliary power system based on photovoltaic power generation

Abstract

The present invention relates to the field of photovoltaic power generation technology, and discloses a coal power plant auxiliary power system based on photovoltaic power generation, including an energy storage module, a load management module, an optimization scheduling module, a power monitoring module and a power management module; the energy storage module is used to store the power generated by the photovoltaic power station when it is surplus during the day, and release it at night or when there is insufficient light to compensate for the instability of photovoltaic power generation; the load management module is used to adjust the power equipment at the user end according to the power supply situation, and also predict future power demand through historical data and real-time information. The present invention allows the coal power station to supply power and charge the energy storage module under the scheduling of the power management module when the sunlight is not enough for the photovoltaic power station to maintain the power supply to the energy storage module, so as to ensure that the energy storage module can store energy at all times, and the stored energy can be output during the peak power consumption period.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and more specifically to an auxiliary power system of a coal power plant based on photovoltaic power generation. Background Art

[0002] Renewable energy represented by wind power has developed rapidly in China, and the development direction of the power system will focus on a new power system with a high proportion of new energy. The output of fluctuating power sources such as wind power and photovoltaic power generation is volatile and uncertain, and is easily affected by seasonal changes and extreme weather. Therefore, coal-fired units are currently needed to play a supporting role. With the development of new power systems, coal-fired units are turning to auxiliary support. Under the premise of ensuring sufficient safety and reliability, reasonable planning of coal-fired units and new energy generating units can reduce economic investment.

[0003] Power supply planning is the first step in power system construction and an important part of power system planning. In the context of developing renewable energy, the first thing that needs to be solved is the power supply planning problem of new energy and traditional coal-fired units. Only a reasonable design of the power supply planning scheme can make the power grid economical, reliable and flexible in future operation.

[0004] The patent now discloses a multi-energy complementary power generation system of a coal-fired generator set and a new energy generator set (publication number CN107171363A), which includes a coal-fired generator set and the new energy generator set, and the new energy generator set includes a wind power generation mechanism, a solar photovoltaic power generation mechanism, a biomass power generation mechanism and a hydropower generation mechanism. In the technology disclosed in the patent, the power generation of photovoltaic and wind power generation is greatly affected by factors such as sunshine intensity and weather changes, resulting in unstable power generation, uneven quality of the output power, and difficulty in achieving continuous and stable power output. Summary of the invention

[0005] The main technical problem solved by the present invention is to provide an auxiliary power system for a coal-fired power plant based on photovoltaic power generation, which solves the problems in the above-mentioned background technology.

[0006] To solve the above technical problems, according to one aspect of the present invention, more specifically, an auxiliary power system for a coal-fired power plant based on photovoltaic power generation includes an energy storage module, a load management module, an optimization scheduling module, a power monitoring module and a power management module;

[0007] The energy storage module is used to store the excess electricity generated by the photovoltaic power station during the day, and release it at night or when there is insufficient sunlight to compensate for the instability of photovoltaic power generation;

[0008] The load management module is used to adjust the power consumption equipment at the user end according to the power supply situation, and also predict the future power demand through historical data and real-time information, arrange the power release strategy of the coal power station and the energy storage module in advance, and balance the output of photovoltaic power generation and coal power generation;

[0009] The optimization scheduling module is used to dynamically adjust the output ratio of photovoltaic power stations and coal power stations according to supply and demand conditions;

[0010] The power monitoring module is used to monitor the voltage, current, power and frequency of the load and output through various sensors and instruments, and feed the monitored data back to the energy storage module so that the energy storage module can output in a targeted manner;

[0011] The power management module is used to manage and dispatch the power outputted by the coal power station, so as to supplement the power outputted by the coal power station when the photovoltaic power station is unstable.

[0012] Furthermore, the energy storage module specifically includes a battery energy storage module, a pumped water energy storage module and a compressed air energy storage module;

[0013] The battery energy storage module is used to store the electricity generated by photovoltaic power generation in the battery when it is excessive during the day, and release it at night or when there is insufficient light to compensate for the instability of photovoltaic power generation;

[0014] The pumped energy storage module is used to use the excess electricity generated by photovoltaic power generation to pump water from a low place to a high place for storage, and release the stored energy through hydroelectric power generation when needed;

[0015] The compressed air energy storage module is used to compress air and store it in underground caves or containers using electricity, and release the compressed air to drive a turbine to generate electricity when needed.

[0016] Furthermore, the power output by the energy storage module is output through the management and scheduling of the load management module and the optimization scheduling module;

[0017] When the external grid load is too heavy and its energy storage module can no longer sustain, its coal-fired power station supplies power to the external grid load by optimizing the dispatching module;

[0018] When the sunlight is insufficient for the photovoltaic power station to maintain power supply to the energy storage module, the coal power station supplies power to the energy storage module under the dispatch of the power management module; the load management module is responsible for matching the output of the energy storage module according to the load of the external power grid, the remaining power of the energy storage module, the load of the internal power grid and the power generation status of the photovoltaic power station. The matching modes are:

[0019]

[0020] in, Indicates the real-time load size of the external power grid. Indicates the average load size of the external power grid load, Indicates the real-time power generation of the photovoltaic power station. It indicates the average annual power generation of the photovoltaic power station, and has:

[0021]

[0022] In the formula, Indicates the temperature impact factor of the energy storage module and its transmission network. Indicates the load size of the internal transmission grid, Indicates the remaining power of the energy storage module. Indicates the temperature of the energy storage module and the transmission grid, A constant that represents the effect of temperature on the cable.

[0023] Furthermore, the power management module specifically includes a data acquisition module, a demand scheduling module, an energy efficiency optimization module, an energy storage scheduling module, a power quality management module and a fault detection module;

[0024] The data acquisition module is used to collect power data of each unit of the coal power station through network transmission, and upload and store the data;

[0025] The demand scheduling module is used to call the power of the coal power station to supplement the energy storage module according to the photovoltaic power station at night or when there is insufficient light;

[0026] The energy efficiency optimization module is used to analyze historical electricity consumption data, identify peak electricity consumption and inefficient electricity consumption links, and take energy-saving improvement measures.

[0027] Furthermore, the energy storage scheduling module is used to optimize the charging and discharging strategy of the energy storage system according to the electricity price, load demand and the output of renewable energy such as photovoltaic power generation;

[0028] The power quality management module is used to monitor and adjust voltage and frequency in real time to maintain the stability and power quality of the power system, and to detect and suppress harmonics in the power system to prevent power quality problems from affecting equipment operation;

[0029] The fault detection module is used to monitor the operating status of the power system in real time, detect potential faults in a timely manner, and use intelligent diagnosis technology to locate the fault point and analyze the cause of the fault.

[0030] Furthermore, by monitoring the voltage and frequency of coal-fired power plants and photovoltaic power plants through monitoring sensors, the voltage deviation and frequency deviation of the output power can be detected, and the power quality index K can be plotted through the voltage deviation and frequency deviation of the output power, as follows:

[0031]

[0032] Among them, the voltage deviation of the output power yes:

[0033]

[0034] Among them, the frequency deviation of the output power yes:

[0035]

[0036] In the formula, Indicates the frequency of real-time monitoring of power plant output. Indicates the standard frequency reference value, Indicates the voltage level of the power plant output monitored in real time. represents the standard voltage reference value, and t represents the duration of monitoring;

[0037] when When the detected power quality does not meet the direct power demand;

[0038] when When the power quality is detected, it meets the direct power demand.

[0039] Furthermore, the photovoltaic power station normally charges the energy storage module under sufficient sunshine, and the energy storage module is used to filter the voltage and current instability of the power directly output by the photovoltaic power station.

[0040] The beneficial effects of the auxiliary power system of a coal-fired power plant based on photovoltaic power generation of the present invention are:

[0041] 1. The present invention allows the photovoltaic power station to charge the energy storage module normally under sufficient sunshine, and then the energy storage module is discharged to supply power to the load of the external power grid, which can effectively avoid the voltage and current instability when the photovoltaic power station directly outputs electricity.

[0042] 2. When the load of the external power grid is too heavy and its energy storage module cannot continue to operate, the coal power station of the present invention supplies electricity to the load of the external power grid by optimizing the scheduling of the scheduling module to supplement the electricity.

[0043] 3. When the sunlight is insufficient for the photovoltaic power station to maintain power supply to the energy storage module, the present invention allows the coal power station to supply power and charge the energy storage module under the dispatch of the power management module. This ensures that the energy storage module can store energy at all times, and the stored energy can be output during peak power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0045] Figure 1 It is a schematic diagram of the present invention. DETAILED DESCRIPTION

[0046] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0047] like Figure 1 As shown, according to one aspect of the present invention, a coal power plant auxiliary power system based on photovoltaic power generation is provided, including an energy storage module, a load management module, an optimization scheduling module, a power monitoring module and a power management module; the energy storage module is used to store the excess power generated by the photovoltaic power station during the day, and release it at night or when there is insufficient light to compensate for the instability of photovoltaic power generation; the load management module is used to adjust the power equipment at the user end according to the power supply situation, and also predict future power demand through historical data and real-time information, arrange the power of the coal power station and the power release strategy of the energy storage module in advance, and balance the output of photovoltaic power generation and coal power generation. This design, which allows the photovoltaic power station to charge the energy storage module normally under sufficient sunlight, and then discharges the energy storage module to supply power to the load of the external power grid, can effectively avoid the voltage and current instability when the photovoltaic power station directly outputs power.

[0048] In this embodiment, the optimization scheduling module is used to dynamically adjust the output ratio of photovoltaic power stations and coal power stations according to supply and demand conditions; the power monitoring module is used to monitor the voltage, current, power, and frequency of the load and output through various sensors and instruments, and feed back the monitored data to the energy storage module so that the energy storage module can output in a targeted manner; the power management module is used to manage and schedule the power output of the coal power station, so as to supplement the output of the coal power station when the photovoltaic power station is unstable. When the sunlight is not enough for the photovoltaic power station to maintain the power supply to the energy storage module, the coal power station is allowed to supply power to the energy storage module under the scheduling of the power management module, so as to ensure that the energy storage module can store energy at all times, and the stored energy can be output at peak times.

[0049] In this embodiment, the energy storage module specifically includes a battery energy storage module, a pumped water energy storage module and a compressed air energy storage module; the battery energy storage module is used to store the electricity generated by photovoltaic power generation in the battery when it is excessive during the day, and release it at night or when there is insufficient light to compensate for the instability of photovoltaic power generation; the pumped water energy storage module is used to use the excess electricity generated by photovoltaic power generation to pump water from a low place to a high place for storage, and release the stored energy through hydropower generation when needed; the compressed air energy storage module is used to use electricity to compress air and store it in underground caves or containers, and release the compressed air when needed to drive turbines to generate electricity. These energy storage systems can help balance the volatility of photovoltaic power generation and coal power generation, improve energy utilization efficiency, and provide a stable power supply when needed.

[0050] In this embodiment, the power output by the energy storage module is output through the management and scheduling of the load management module and the optimization scheduling module; when the load of the external power grid is too large and the energy storage module cannot continue, the coal power station supplies power to the load of the external power grid through the scheduling of the optimization scheduling module to supplement the power; when the sunlight is not enough for the photovoltaic power station to maintain the power supply to the energy storage module, the coal power station supplies power to charge the energy storage module under the scheduling of the power management module;

[0051] The load management module is responsible for matching the output of the energy storage module according to the load of the external grid, the remaining power of the energy storage module, the load of the internal grid and the power generation status of the photovoltaic power station. The matching modes are:

[0052]

[0053] in, Indicates the real-time load size of the external power grid. Indicates the average load size of the external power grid load, Indicates the real-time power generation of the photovoltaic power station. It indicates the average annual power generation of the photovoltaic power station, and has:

[0054]

[0055] In the formula, Indicates the temperature impact factor of the energy storage module and its transmission network. Indicates the load size of the internal transmission grid, Indicates the remaining power of the energy storage module. Indicates the temperature of the energy storage module and the transmission grid, A constant that represents the effect of temperature on the cable.

[0056] Through the monitoring of internal sensors, the load size of the internal transmission grid , the remaining power of the energy storage module , the real-time load size of the external power grid , the influence constant of temperature on the cable , the temperature of the energy storage module and the transmission grid ,have:

[0057]

[0058] In addition, the real-time power generation of the photovoltaic power station , the average annual power generation of photovoltaic power stations , the average load size of the external grid load ,have:

[0059]

[0060] when When the output module is used for output first;

[0061] when When, the energy storage module and the coal power station output in proportion;

[0062] when When coal-fired power plants are given priority for output.

[0063] In this embodiment, the power management module specifically includes a data acquisition module, a demand scheduling module, an energy efficiency optimization module, an energy storage scheduling module, a power quality management module and a fault detection module; the data acquisition module is used to collect power data of each unit of the coal power station through network transmission, and upload and store the data; the demand scheduling module is used to call the power of the coal power station to supplement the energy storage module according to the photovoltaic power station at night or when there is insufficient light; the energy efficiency optimization module is used to analyze historical power consumption data, identify peak power consumption and inefficient power consumption links, and take energy-saving improvement measures.

[0064] In this embodiment, the energy storage scheduling module is used to optimize the charging and discharging strategy of the energy storage system according to the electricity price, load demand and the output of renewable energy such as photovoltaic power generation; the power quality management module is used to monitor and adjust the voltage and frequency in real time to maintain the stability and power quality of the power system, and detect and suppress harmonics in the power system to prevent power quality problems from affecting equipment operation; the fault detection module is used to monitor the operating status of the power system in real time, detect potential faults in a timely manner, and use intelligent diagnostic technology to locate the fault point and analyze the cause of the fault. By monitoring the voltage and frequency of coal-fired power stations and photovoltaic power stations through monitoring sensors, it is possible to detect the voltage deviation and frequency deviation of the output power, and draw the power quality index K through the voltage deviation and frequency deviation of the output power, as follows:

[0065]

[0066] Among them, the voltage deviation of the output power yes:

[0067]

[0068] Among them, the frequency deviation of the output power yes:

[0069]

[0070] In the formula, Indicates the frequency of real-time monitoring of power plant output. Indicates the standard frequency reference value, Indicates the voltage level of the power plant output monitored in real time. represents the standard voltage reference value, and t represents the duration of monitoring;

[0071] when When the detected power quality does not meet the direct power demand;

[0072] when When the power quality is detected, it meets the direct power demand.

[0073] The photovoltaic power station normally charges the energy storage module under sufficient sunshine. The energy storage module is used to filter the voltage and current instability of the power directly output by the photovoltaic power station.

[0074] When monitoring the power generated by a photovoltaic power station, the frequency of real-time monitoring of its output power , standard frequency reference value ; The voltage of the output power is monitored in real time , standard voltage reference value , at this time:

[0075]

[0076] That is, the quality index of the power generated by the photovoltaic power station after monitoring is The output electricity does not meet the needs of direct use and needs to be stored in the energy storage module first. This can greatly reduce the loss of electricity in the power grid and reduce the loss to the load and energy storage module.

[0077] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention also fall within the protection scope of the present invention.

Claims

1. An auxiliary power system for a coal-fired power plant based on photovoltaic power generation, characterized in that: Including energy storage module, load management module, optimization scheduling module, power monitoring module and power management module; The energy storage module is used to store the electricity generated by the photovoltaic power station when it is in excess during the day, and release it at night or when there is insufficient sunlight to compensate for the instability of photovoltaic power generation; The load management module is used to adjust the power consumption equipment at the user end according to the power supply situation, and also predict the future power demand through historical data and real-time information, arrange the power release strategy of the coal power station and the energy storage module in advance, and balance the output of photovoltaic power generation and coal power generation; The optimization scheduling module is used to dynamically adjust the output ratio of photovoltaic power stations and coal power stations according to supply and demand conditions; The power monitoring module is used to monitor the voltage, current, power and frequency of the load and output through various sensors and instruments, and feed the monitored data back to the energy storage module so that the energy storage module can output in a targeted manner; The power management module is used to manage and dispatch the power output of the coal power station so as to supplement the power output of the coal power station when the photovoltaic power station is unstable; The power output by the energy storage module is output through the management and scheduling of the load management module and the optimization scheduling module; When the external grid load is too heavy and its energy storage module can no longer sustain, its coal-fired power station supplies power to the external grid load by optimizing the dispatching module; When the sunlight is insufficient for the photovoltaic power station to maintain power supply to the energy storage module, the coal power station supplies power to charge the energy storage module under the dispatch of the power management module; The load management module is responsible for matching the output of the energy storage module according to the load of the external grid, the remaining power of the energy storage module, the load of the internal grid and the power generation status of the photovoltaic power station. The matching modes are: in, Indicates the real-time load size of the external power grid. Indicates the average load size of the external power grid load, Indicates the real-time power generation of the photovoltaic power station. It indicates the average annual power generation of the photovoltaic power station, and has: In the formula, Indicates the temperature impact factor of the energy storage module and its transmission network. Indicates the load size of the internal transmission grid, Indicates the remaining power of the energy storage module. Indicates the temperature of the energy storage module and the transmission grid, It represents the influence constant of temperature on cable, where C represents the matching coefficient.

2. The auxiliary power system of a coal-fired power plant based on photovoltaic power generation according to claim 1 is characterized by: The energy storage module specifically includes a battery energy storage module, a pumped water energy storage module and a compressed air energy storage module; The battery energy storage module is used to store the electricity generated by photovoltaic power generation in the battery when it is excessive during the day, and release it at night or when there is insufficient light to compensate for the instability of photovoltaic power generation; The pumped energy storage module is used to use the excess electricity generated by photovoltaic power generation to pump water from a low place to a high place for storage, and release the stored energy through hydroelectric power generation when needed; The compressed air energy storage module is used to compress air and store it in underground caves or containers using electricity, and release the compressed air to drive a turbine to generate electricity when needed.

3. The auxiliary power system of a coal-fired power plant based on photovoltaic power generation according to claim 1 is characterized by: The power management module specifically includes a data acquisition module, a demand scheduling module, an energy efficiency optimization module, an energy storage scheduling module, a power quality management module and a fault detection module; The data acquisition module is used to collect power data of each unit of the coal power station through network transmission, and upload and store the data; The demand scheduling module is used to call the power of the coal power station to supplement the energy storage module according to the photovoltaic power station at night or when there is insufficient light; The energy efficiency optimization module is used to analyze historical electricity consumption data, identify peak electricity consumption and inefficient electricity consumption links, and take energy-saving improvement measures.

4. The auxiliary power system of a coal-fired power plant based on photovoltaic power generation according to claim 3 is characterized by: The energy storage scheduling module is used to optimize the charging and discharging strategy of the energy storage system according to the electricity price, load demand and photovoltaic power generation output; The power quality management module is used to monitor and adjust voltage and frequency in real time, maintain the stability and power quality of the power system, and detect and suppress harmonics in the power system to prevent power quality problems from affecting equipment operation; The fault detection module is used to monitor the operating status of the power system in real time, detect potential faults in a timely manner, and use intelligent diagnosis technology to locate the fault point and analyze the cause of the fault.

5. The auxiliary power system of a coal-fired power plant based on photovoltaic power generation according to claim 4 is characterized by: By monitoring the voltage and frequency of coal-fired power plants and photovoltaic power plants through monitoring sensors, the voltage deviation and frequency deviation of the output power can be detected, and the power quality index K can be drawn through the voltage deviation and frequency deviation of the output power, as follows: Among them, the voltage deviation of the output power yes: Among them, the frequency deviation of the output power yes: In the formula, Indicates the frequency of real-time monitoring of power plant output. Indicates the standard frequency reference value, Indicates the voltage level of the power plant output monitored in real time. represents the standard voltage reference value, and t represents the duration of monitoring; when When the detected power quality does not meet the direct power demand; when When the power quality is detected, it meets the direct power demand.

6. The auxiliary power system of a coal-fired power plant based on photovoltaic power generation according to claim 1, characterized in that: The photovoltaic power station normally charges the energy storage module under sufficient sunshine, and the energy storage module is used to filter the voltage and current instability of the power directly output by the photovoltaic power station.

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