New energy field station AGC control method and device using energy consumption resistor

Abstract

The invention discloses a new energy field station AGC control method and device using an energy consumption resistor, an inverter output side of a new energy field station is provided with an energy consumption resistor assembly, and the method comprises the steps: obtaining a generated power real-time value of the new energy field station in a current control period, and calculating an actual generated power difference value based on a generated power instruction value received by the new energy field station; judging whether the actual generated power difference value is greater than or equal to a power difference value threshold value; if yes, an energy consumption resistor capable of consuming power corresponding to the actual generated power difference value is controlled to be switched on, and the generated power of the actual generated power difference value is consumed, so that the generated power output value and the generated power instruction value of the new energy station are balanced; if not, the current operation state of the energy consumption resistor assembly is kept. The energy consumption resistor assembly is arranged on the output side of the inverter, so that the energy consumption resistor intervenes in time and consumes redundant power when the actual power generation power exceeds an instruction value, the problems of power generation volatility and intermittency are solved, and rapid and accurate adjustment of the output power is achieved.

Description

Technical Field

[0001] The present invention relates to the field of renewable energy power generation control technology, and in particular to a renewable energy station AGC control method and device using energy-consuming resistors. Background Art

[0002] In new energy stations (such as wind farms and photovoltaic power plants), the automatic generation control system (AGC) is a key technology to ensure the stable operation of the power system. Due to the volatility and intermittency of new energy, it is difficult to accurately control the output power of the station. Energy-consuming resistors can be used as an effective means of power regulation. When the output power of a new energy station exceeds the requirements of the grid dispatching instructions, the excess energy is consumed in the energy-consuming resistors, thereby achieving effective control of the station output power.

[0003] AGC is mainly used to control the active power output of the generator sets in the power grid in real time, so that the generated power can automatically adapt to the random changes in the load of the power system and other disturbances, thereby ensuring the frequency stability of the power system, the interconnection line exchange power meets the planned requirements, and the power generation cost is as low as possible. AGC is a closed-loop control system that uses the frequency deviation of the power grid or the interconnection line power deviation as a feedback signal. Based on these deviation signals, the control center calculates the amount of power that needs to be adjusted for each generator set according to the predetermined control strategy. Then a control command is issued to the generator set. After the generator set adjusts the output power according to the command, the AGC continues to monitor the feedback signal and makes continuous adjustments until the frequency deviation or the interconnection line power deviation is within the allowable range.

[0004] Since the output power of new energy (such as wind power and solar energy) has significant volatility. For example, solar power generation depends on light intensity. On cloudy days, when clouds are blocked, or during sunrise and sunset, the light intensity changes rapidly, causing the photovoltaic power generation power to fluctuate sharply. It is difficult to quickly and effectively handle such large-scale and rapidly changing power fluctuations by relying solely on traditional power regulation methods (such as adjusting the power factor of the inverter). Traditional regulation methods have regulation lags. When the power generation power rises rapidly, the output power cannot be reduced in time to match the power grid demand. Moreover, in extreme weather or special working conditions, the output power of new energy stations may far exceed the grid's acceptance capacity. Relying solely on existing power generation equipment (such as wind turbine pitch angle adjustment) for power control, the regulation range is limited, and the output power cannot be quickly reduced to a level acceptable to the grid, which may pose a serious threat to the safe and stable operation of the grid. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide an AGC control method and device for a new energy station using an energy-consuming resistor. By setting an energy-consuming resistor component on the output side of the inverter, the energy-consuming resistor intervenes in time when the actual power generation exceeds the command value to consume excess power, overcome the volatility and intermittent problems brought about by new energy power generation, and achieve rapid and accurate adjustment of the station output power, ensuring the matching of the output power with the command value, which helps to maintain the power balance of the power system.

[0006] To solve the above technical problems, a first aspect of an embodiment of the present invention provides an AGC control method for a new energy station using an energy-consuming resistor. An energy-consuming resistor component is provided on the output side of an inverter of the new energy station. The energy-consuming resistor component includes a plurality of energy-consuming resistors. The method includes the following steps:

[0007] Obtain the real-time value of the power generation of the new energy station in the current control cycle, and calculate the actual power generation difference based on the power generation command value received by the new energy station;

[0008] Determining whether the actual generated power difference is greater than or equal to a power difference threshold;

[0009] If so, the energy dissipation resistor that can consume power corresponding to the actual power generation difference is controlled to be turned on, and the power generation power of the actual power generation difference is consumed, so that the power generation output value of the new energy station and the power generation command value are balanced;

[0010] If not, the current operating state of the energy dissipation resistor component is maintained.

[0011] Furthermore, before the energy dissipation resistor that can consume power corresponding to the difference between the actual generated power is turned on, the control further includes:

[0012] Obtaining a deviation ratio value between actual power consumption and theoretical power consumption of each energy-consuming resistor, wherein the deviation ratio value S=(actual power consumption / theoretical power consumption);

[0013] The corresponding share of the actual power generation difference value allocated to the corresponding energy dissipation resistor is calibrated based on the deviation ratio value.

[0014] Furthermore, the step of obtaining the deviation ratio between the actual power consumption of each energy dissipation resistor and the theoretical power consumption includes:

[0015] Acquire the real-time temperature value and the real-time voltage value of the energy-consuming resistor and the real-time frequency value of the circuit where the energy-consuming resistor is located;

[0016] Based on the real-time temperature value, the real-time voltage value and the real-time frequency value, a deviation ratio value between the actual power consumption of the energy dissipation resistor and the theoretical power consumption is calculated.

[0017] Furthermore, the calculation formula of the deviation ratio value between the actual power consumption of the energy dissipation resistor and the theoretical power consumption is:

[0018]

[0019] Among them, S is the deviation ratio value, R 0 is the energy dissipation resistor at reference temperature T 0 The resistance value when T is the length of the control cycle, U m is, ΔU(t) is the voltage amplitude fluctuation, ω=2πf is the angular frequency, Δω(t) is the angular frequency fluctuation, is the initial phase, is the initial phase fluctuation, α is the temperature coefficient of resistance, T real is the actual temperature value of the energy dissipation resistor, T 0 is the reference temperature value of the energy dissipation resistor, L is the inductance value of the circuit where the energy dissipation resistor is located, and C is the capacitance value of the circuit where the energy dissipation resistor is located.

[0020] Furthermore, before calculating the deviation ratio between the actual power consumption of the energy dissipation resistor and the theoretical power consumption, the method further includes:

[0021] Obtaining the usage time of the energy-consuming resistor;

[0022] Calculating an aging coefficient of the energy-consuming resistor based on the used time;

[0023] In combination with the aging coefficient, calculating the deviation ratio between the actual power consumption of the energy dissipation resistor and the theoretical power consumption;

[0024] The calculation formula of the deviation ratio between the actual power consumption of the energy dissipation resistor and the theoretical power consumption is:

[0025]

[0026] Where k is the aging rate constant of the energy dissipation resistor, t use is the usage time of the energy consumption resistor.

[0027] Furthermore, before obtaining the real-time value of the power generation of the new energy station in the current control cycle, the method further includes:

[0028] In the previous control cycle, obtaining a predicted value of the power generation of the new energy station in the current control cycle;

[0029] Calculating the difference between the predicted power generation value of the current control cycle and the predicted power generation command value;

[0030] Determining whether the predicted generated power difference is greater than or equal to a power difference threshold;

[0031] If so, in the current control cycle, the energy dissipation resistor that can consume power corresponding to the predicted power generation difference is controlled to be turned on to consume the power generated by the predicted power generation difference.

[0032] Furthermore, the AGC control method of the new energy station using the energy-consuming resistor also includes:

[0033] When one or more of the plurality of energy-consuming resistors are in a short-circuit or open-circuit state, the actual power generation difference is redistributed to the plurality of energy-consuming resistors in a normal state.

[0034] Accordingly, a second aspect of an embodiment of the present invention provides an AGC control device for a new energy station using an energy-consuming resistor, wherein an energy-consuming resistor component is provided on the inverter output side of the new energy station, wherein the energy-consuming resistor component includes a plurality of energy-consuming resistors, and the device includes:

[0035] A difference calculation module is used to obtain the real-time value of the power generation of the new energy station in the current control cycle, and calculate the actual power generation difference based on the power generation command value received by the new energy station;

[0036] A threshold judgment module, which is used to judge whether the actual generated power difference is greater than or equal to a power difference threshold;

[0037] An energy consumption control module, which is used to control the energy consumption resistor that can consume power corresponding to the actual power difference to be turned on when the actual power difference is greater than or equal to the power difference threshold, so as to consume the power generated by the actual power difference and balance the power output value of the new energy station with the power command value;

[0038] The energy consumption control module is further configured to maintain the current operating state of the energy consumption resistor component when the actual generated power difference is less than the power difference threshold.

[0039] Correspondingly, a third aspect of an embodiment of the present invention provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the above-mentioned new energy station AGC control method using energy-consuming resistors.

[0040] Correspondingly, a fourth aspect of an embodiment of the present invention provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the above-mentioned new energy station AGC control method using energy-consuming resistors.

[0041] The above technical solution of the embodiment of the present invention has the following beneficial technical effects:

[0042] 1. By setting an energy-consuming resistor component on the output side of the inverter, the energy-consuming resistor can intervene in time when the actual power generation exceeds the command value to consume excess power, overcome the volatility and intermittent problems brought by renewable energy power generation, achieve rapid and accurate adjustment of the station output power, ensure the matching of output power with the command value, and help maintain the power balance of the power system;

[0043] 2. It helps to improve the stability of the entire power system, use energy-consuming resistors to consume excess power in a timely manner, avoid the impact of power mutations on the power grid caused by new energy sites, and prevent power mutations from causing power grid frequency fluctuations and voltage instability, so that the key operating parameters of the power grid, such as frequency and voltage, can be maintained within a relatively stable and reasonable range, ensuring the safe and stable operation of the power system;

[0044] 3. The components composed of multiple energy-consuming resistors increase the flexibility of control. According to the size of the actual power generation difference, the energy-consuming resistors with corresponding quantity or power capacity can be selected to be turned on, so as to realize the classification and precise control of different degrees of power surplus. It can better adapt to the complex and changeable power generation changes of new energy sites and meet the diverse power regulation needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a flow chart of a new energy station AGC control method using energy-consuming resistors provided in an embodiment of the present invention;

[0046] Figure 2 It is a block diagram of a module of an AGC control device for a new energy station using an energy-consuming resistor provided in an embodiment of the present invention.

[0047] Reference numerals:

[0048] 1. Difference calculation module, 2. Threshold judgment module, 3. Energy consumption control module. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0050] Please refer to Figure 1 A first aspect of an embodiment of the present invention provides an AGC control method for a new energy station using an energy-consuming resistor. An energy-consuming resistor component is provided on the inverter output side of the new energy station. The energy-consuming resistor component includes a plurality of energy-consuming resistors. The method includes the following steps:

[0051] Step S200, obtaining the real-time value of the power generation of the new energy station in the current control cycle, and calculating the actual power generation difference based on the power generation command value received by the new energy station.

[0052] Install high-precision power measurement devices at key locations of new energy stations (such as the inverter output side or the total output end of the station) to accurately obtain the real-time value of the generated power in the current control cycle. The power measurement device needs to have fast response characteristics and be able to capture instantaneous changes in power in a timely manner, because the power generated by new energy is affected by natural factors such as light intensity (for photovoltaics) and wind speed (for wind power), and may fluctuate significantly in a short period of time.

[0053] The power generation command value is the target power value issued to the new energy station after being determined by the power grid dispatching center based on multiple factors such as the overall operation status of the power grid and load demand. The actual power generation difference is obtained by subtracting the real-time value from the command value. The positive and negative value and size of this difference directly reflect the degree of deviation between the current power generation of the station and the expected target, which is the key basis for determining whether it is necessary to start the energy-consuming resistor for power regulation and determine the amount of regulation.

[0054] In order to improve the accuracy and reliability of data, multi-sensor redundant measurement can be adopted, such as installing multiple power sensors at different locations, comparing the measurement results and data fusion processing, and removing abnormal values. At the same time, the power measurement device is calibrated regularly to ensure that its measurement accuracy is always within the allowable error range. When calculating the actual power generation difference, it is possible to consider introducing a weighted algorithm. According to the characteristics of power fluctuations in different periods in historical data, different weights are assigned to the current real-time power generation value and the power generation command value, so that the calculated difference can better reflect the actual deviation of the station from the target power under the current working conditions. For example, in a wind farm, when the wind speed is in a rapid change stage, the weight of the current real-time power generation value is appropriately increased to respond to the power change trend more quickly.

[0055] Step S300, determining whether the actual generated power difference is greater than or equal to a power difference threshold.

[0056] The power difference threshold is set to determine whether the energy-consuming resistor needs to be started for power regulation. The setting of the power difference threshold needs to take into account many factors, such as the grid's tolerance for power fluctuations in new energy stations, the capacity and response characteristics of the energy-consuming resistor components, and the operating stability of the station's own power generation equipment.

[0057] If the actual power generation difference is greater than or equal to the threshold, it means that the current power generation of the station exceeds the expected range of the grid dispatch, and the degree of deviation has reached the level that requires intervention and adjustment; conversely, if the difference is less than the threshold, it means that although the current power generation may deviate from the command value, it is within the acceptable fluctuation range of the grid. There is no need to start the energy-consuming resistor for adjustment temporarily, and the current operating state can be maintained. This can avoid unnecessary frequent operation of the energy-consuming resistor and reduce equipment loss and energy waste.

[0058] In addition, the power difference threshold is not fixed and can be adjusted dynamically according to the different periods of grid operation, different seasons and the operating status of the new energy station itself. For example, during the peak load period of the grid, in order to ensure the stable operation of the grid, the power difference threshold is appropriately lowered and the precision requirements for power control of the new energy station are improved; during the maintenance period of the power generation equipment of the new energy station or when it is in a low-efficiency operation state, the power difference threshold is correspondingly increased and the requirements for power regulation are relaxed to reduce the frequency of use of energy-consuming resistors and extend their service life.

[0059] Step S400, if so, control the energy-consuming resistor that can consume the power corresponding to the difference between the actual power generation and the actual power generation to conduct, consume the power generated by the difference between the actual power generation, and balance the power generation output value and the power generation command value of the new energy station.

[0060] First, the number or combination of energy-consuming resistors that need to be turned on should be determined according to the size of the actual power generation difference to ensure that the excess power generation can be consumed. Based on the rated power, resistance value and heat dissipation characteristics of each energy-consuming resistor in the energy-consuming resistor assembly, accurate power consumption control can be achieved through reasonable calculation and allocation. In the process of turning on the energy-consuming resistor, the safety and stability of the circuit should be considered, such as avoiding excessive impact current caused by sudden connection of the resistor, which may damage the circuit equipment. Optionally, soft start technology can be used to gradually increase the connection current of the resistor so that the circuit can smoothly transition to the power regulation state. At the same time, during the operation of the energy-consuming resistor, the power consumed by the resistor should be monitored in real time to ensure that the actual power consumption is consistent with the expected regulation power, to prevent excessive power regulation deviations due to factors such as resistor aging and ambient temperature changes, and to affect the balance between the power output value of the station and the power command value of the power generation.

[0061] In order to improve the flexibility and efficiency of energy-consuming resistor control, a group control method can also be used to divide multiple energy-consuming resistors into different groups. According to the size of the actual power difference, the appropriate group is preferentially selected for conduction, rather than controlling each resistor one by one. This can reduce the number of control switch actions and improve the response speed.

[0062] After determining the energy-consuming resistor that needs to be turned on, it is also possible to combine reactive power compensation technology with energy-consuming resistors according to the current circuit voltage and current phase relationship, and appropriately adjust reactive power while consuming active power, thereby improving the power factor of the station and improving the quality of electric energy. For example, for some energy-consuming resistor devices with reactive power regulation functions (such as composite energy-consuming resistors with capacitor or inductor compensation elements), when turned on, the parameters of the compensation elements can be dynamically adjusted according to the reactive power requirements of the circuit, thereby achieving coordinated regulation of active and reactive power.

[0063] In addition, after the energy-consuming resistor is turned on, its working state can be optimized using an intelligent control algorithm. For example, its working current can be adjusted in real time according to the temperature change of the resistor, so that the resistor always works in the optimal power consumption efficiency range, reducing energy loss and thermal stress of the resistor and extending its service life.

[0064] Step S500: If not, the current operating state of the energy-consuming resistor component is maintained.

[0065] When the actual power generation difference is within an acceptable range, the energy-consuming resistor is not turned on and the current operating state is maintained. This can prevent the energy-consuming resistor from working unnecessarily, reduce the electric energy consumed by the heating of the resistor, and also reduce the loss and maintenance cost of the resistor. Because the energy-consuming resistor generates heat during operation, it needs to be equipped with a corresponding heat dissipation device. If it is started and stopped frequently, it will not only increase the workload of the heat dissipation device, but also may cause damage to the internal structure of the resistor due to factors such as thermal expansion and contraction, affecting its service life and reliability. By maintaining the current operating state, the system achieves energy saving and stable operation while meeting the power requirements of the power grid for new energy stations.

[0066] Furthermore, before the energy dissipation resistor that consumes the power corresponding to the difference between the actual generated power and the control in step S200 is turned on, the process further includes:

[0067] Step S110, obtaining a deviation ratio value between actual power consumption and theoretical power consumption of each energy dissipation resistor, wherein the deviation ratio value S=(actual power consumption / theoretical power consumption).

[0068] To obtain the actual power consumption, it is necessary to install a power monitoring device in the circuit of the energy-consuming resistor, measure the electric energy consumed by the resistor in real time when working, and calculate the actual power consumption value by integrating at a specific time interval. The theoretical power consumption is based on the basic theory of Ohm's theorem, combined with known resistance values, applied voltage or current and other parameters. The calculated deviation ratio value can intuitively reflect the degree to which the actual power consumption of each energy-consuming resistor deviates from the theoretical value due to various factors (such as the manufacturing tolerance of the resistor itself, the impact of temperature changes on the resistance value, interference from other components in the circuit, etc.). For example, if the deviation ratio value is greater than 1, it means that the actual power consumption is higher than the theoretical value, which may be due to the fact that the actual resistance value of the resistor is less than the nominal resistance value or the temperature of the resistor increases; if the deviation ratio value is less than 1, it means that the actual power consumption is lower than the theoretical value, which may be affected by the voltage division or current shunting of other impedance elements in the circuit.

[0069] Step S120 , calibrating the corresponding share of the actual power generation difference value allocated to the corresponding energy consumption resistor based on the deviation ratio value.

[0070] After the deviation ratio value of each energy-consuming resistor is determined, it is necessary to adjust the corresponding share of the actual power generation difference originally planned to be allocated to them to ensure that the excess power generation can be accurately consumed in the end, so that the power generation output value and the power generation command value of the new energy station are balanced. If the deviation ratio value of a certain energy-consuming resistor is large, it means that its actual power consumption deviates greatly from the theoretical expectation, so its share needs to be increased or decreased accordingly when allocating power. For example, if the deviation ratio value of an energy-consuming resistor is 1.2 (the actual power consumption is higher than the theoretical value), its allocation share can be appropriately reduced when allocating power, because the energy-consuming resistor will consume more power under the same control signal; on the contrary, for energy-consuming resistors with a deviation ratio value of 0.8 (the actual power consumption is lower than the theoretical value), its allocation share may need to be increased. Through this calibration method, the problem of inaccurate power regulation caused by individual differences in energy-consuming resistors can be compensated, and the accuracy and reliability of the entire energy-consuming resistor component in the power regulation process can be improved.

[0071] Furthermore, when calibrating the power share, a dynamic allocation algorithm can be used to not only consider the current deviation ratio value, but also to make a comprehensive allocation based on the real-time working status of the energy-consuming resistor (such as the current temperature, the running time, etc.) and the remaining capacity of the entire energy-consuming resistor component. For example, for energy-consuming resistors with higher temperatures, their power allocation share can be appropriately reduced to prevent them from being damaged due to overheating; for energy-consuming resistors that have been running for a long time and whose performance may have declined, their allocation strategy can also be adjusted accordingly.

[0072] At the same time, in the power allocation process, the concept of priority can be introduced. For energy-consuming resistors with small deviation ratio values ​​and stable performance, power can be allocated first to improve the efficiency and stability of the entire power regulation process. In addition, in order to verify the power allocation effect after calibration, the actual power consumption of each energy-consuming resistor and the power output value of the station can be monitored in real time during the power regulation process. According to the monitoring results, the calibration algorithm is continuously optimized to achieve closed-loop control and ensure the accuracy and stability of power regulation.

[0073] Furthermore, obtaining the deviation ratio value between the actual power consumption of each energy dissipation resistor and the theoretical power consumption in step S110 includes:

[0074] Step S111, obtaining the real-time temperature value and the real-time voltage value of the energy-consuming resistor and the real-time frequency value of the circuit where the energy-consuming resistor is located.

[0075] Step S112, based on the real-time temperature value, the real-time voltage value and the real-time frequency value, the deviation ratio between the actual power consumption of the energy dissipation resistor and the theoretical power consumption is calculated.

[0076] Furthermore, the calculation formula for the deviation ratio between the actual power consumption of the energy dissipation resistor and the theoretical power consumption is:

[0077]

[0078] Among them, S is the deviation ratio value, R 0 is the energy dissipation resistor at reference temperature T 0 The resistance value when T is the length of the control cycle, U m is, ΔU(t) is the voltage amplitude fluctuation, ω=2πf is the angular frequency, Δω(t) is the angular frequency fluctuation, is the initial phase, is the initial phase fluctuation, α is the temperature coefficient of resistance, T real is the actual temperature value of the energy dissipation resistor, T 0 is the reference temperature value of the energy dissipation resistor, L is the inductance value of the circuit where the energy dissipation resistor is located, and C is the capacitance value of the circuit where the energy dissipation resistor is located.

[0079] The theoretical power consumption of a power dissipation resistor can be calculated when the resistance value, voltage value or current value is known. For example, when the resistance value R = 10Ω, the voltage value applied to both ends of the resistor is 100V, then the theoretical power consumption can be obtained as 1000W.

[0080] When calculating the actual power consumption of the energy-consuming resistor, the influence of temperature on the resistance of the energy-consuming resistor is first considered. Assume that the resistance temperature coefficient is α and the ambient temperature is T real , the reference temperature is T 0 , resistance at reference temperature T0 The resistance value is R 0 , then the actual resistance value is R 0 ×(1+α(T real -T 0 )). Secondly, the actual voltage may fluctuate due to factors such as the internal loss of the inverter and the line impedance. Let the voltage fluctuation function be Further get the actual voltage effective value Thirdly, considering the current fluctuation, the current will also fluctuate due to the inverter output characteristics and the load conditions connected to the energy-consuming resistor (such as other parallel or series components). Assuming that the impedance of the circuit includes the inductor L and the capacitor C in addition to the resistor R, the impedance is Z = R + j (X L -X C ), the actual current is a function of factors including voltage fluctuation and impedance change, and the actual current effective value is Get P 实际 =I 2 实际-rms R. From the above content, we can know that the formula for calculating the ratio of actual power consumption to theoretical power consumption is:

[0081] Moreover, the above formula sets the angular frequency term, which determines how fast the voltage and current change over time. For the AC voltage output by the inverter Angular frequency directly affects the period of the sine wave. The angular frequency fluctuation Δω(t) takes into account the instability of angular frequency in the actual circuit due to various factors (such as changes in the working state of the power electronic devices inside the inverter, grid frequency fluctuations, etc.). Angular frequency fluctuations will cause the period of the sine function in the integral to change. If the angular frequency increases, the period of the sine wave becomes shorter, and the change of voltage within a period changes, thus affecting the calculation of the effective value of the voltage. This means that even if the voltage amplitude U m The fluctuation of angular frequency will also cause the actual voltage effective value to change, thus affecting the actual power consumption of the resistor. The phase instability caused by signal interference and phase difference between different power supplies in the actual circuit is taken into account. The initial phase fluctuation will change the value range of the sine function in the integral interval. Different initial phases will cause different voltage distributions in a cycle. Even if the voltage amplitude and angular frequency remain unchanged, the initial phase fluctuation will affect the calculation of the effective value of the voltage, and thus affect the actual power consumption of the resistor.

[0082] Furthermore, before calculating the deviation ratio between the actual power consumption of the energy-consuming resistor and the theoretical power consumption in step S112, the method further includes:

[0083] Step S111a, obtaining the usage time of the energy-consuming resistor.

[0084] During long-term operation, the performance of energy-consuming resistors will gradually change, and the length of time in use is a key parameter for evaluating their degree of aging and performance changes. By recording the time from the start of use of the energy-consuming resistor to the current moment, basic data can be provided for subsequent analysis of the impact of its aging on power consumption characteristics. This data can be obtained through the equipment management system of the station or a special timing device to ensure accurate recording of the cumulative operating time of each energy-consuming resistor. For example, in the operation and maintenance database of the new energy station, an operating time record file is established for each energy-consuming resistor, and the operating time data is updated accordingly each time the equipment is started or stopped.

[0085] In addition to simply recording the total usage time, you can also further subdivide and record the operating time under different working conditions (such as different power output levels, different ambient temperature ranges, etc.). Because the aging speed of energy-consuming resistors under different working conditions may vary, this record helps to more accurately analyze the impact of aging on power characteristics. At the same time, timestamp technology can be used to accurately mark each operating period of the energy-consuming resistor, which is convenient for subsequent tracing and analysis of the impact of the operating conditions in a specific time period on its performance. For example, when a power anomaly occurs, you can quickly view the operating conditions and time distribution before the abnormal period to determine whether the resistor aging problem is caused by long-term operation under specific working conditions.

[0086] Step S111b, calculating the aging coefficient of the energy-consuming resistor based on the usage time.

[0087] Energy-consuming resistors made of different materials (such as wire-wound resistors, carbon film resistors, metal oxide film resistors, etc.) have different aging mechanisms and speeds. Wire-wound resistors may cause changes in the mechanical properties of the windings due to long-term thermal stress, thereby affecting the resistance value; carbon film resistors may age due to the volatilization or structural changes of the carbon film. Therefore, when calculating the aging coefficient, different models should be established or different parameters should be used for different materials. For example, for wire-wound resistors, an aging coefficient model related to the length of use can be constructed based on the physical properties such as the thermal expansion coefficient and melting point of its winding material and the heat dissipation conditions, which may include thermal aging items of winding resistance changing with temperature, resistance change items caused by mechanical stress, etc.; for carbon film resistors, the thickness change rate of the carbon film, the chemical stability of the carbon element and other factors can be considered to determine the relationship between the aging coefficient and the length of use. In this way, the aging of resistors of different materials can be more accurately reflected.

[0088] Step S111c, combining the aging coefficient, calculates the deviation ratio between the actual power consumption of the energy dissipation resistor and the theoretical power consumption.

[0089] The aging coefficient is a comprehensive indicator that reflects the performance changes of energy-consuming resistors due to usage time and various environmental factors. When calculating the deviation ratio between actual power consumption and theoretical power consumption, the introduction of the aging coefficient can more accurately consider the impact of resistor performance changes on power consumption.

[0090] In addition, aging can change not only the value of a resistor, but also its temperature coefficient. As a resistor ages, its temperature coefficient can increase or decrease, meaning that the resistor value will change by a different amount than when it was new for the same temperature change. Both of these factors can be taken into account when calculating the deviation ratio.

[0091] Correspondingly, the calculation formula for the deviation ratio between the actual power consumption of the energy dissipation resistor and the theoretical power consumption is:

[0092]

[0093] Where k is the aging rate constant of the energy dissipation resistor, t use is the usage time of the energy consumption resistor.

[0094] In a specific implementation of the embodiment of the present invention, before obtaining the real-time value of the power generation power of the new energy station in the current control cycle in step S200, the following steps are further included:

[0095] Step S141, in the previous control cycle, obtain the predicted value of the generated power of the new energy station for the current control cycle.

[0096] Renewable energy power generation is affected by natural conditions (such as light intensity, wind speed, etc.), and its output power has great uncertainty and volatility. By obtaining the power generation prediction value of the current control cycle in the previous control cycle, the possible power situation can be estimated in advance. This prediction value is usually based on historical power generation data, weather forecast information, station equipment operation status and other factors. For example, for photovoltaic stations, the light intensity and power generation data of the same season and time period in the past years can be used to establish a model, and the power generation power of the current control cycle can be estimated by combining the light duration, intensity and other information in the current weather forecast; for wind farms, the power generation power is predicted based on the historical wind speed and power generation relationship and the wind speed forecast data provided by the meteorological department. Obtaining accurate prediction values ​​helps to plan and prepare power regulation strategies in advance, improve the response capability of new energy stations to power grid power instructions and the stability of the power system.

[0097] Step S142, calculating the predicted power generation difference between the power generation prediction value and the power generation command value of the current control cycle.

[0098] The predicted power generation difference is obtained. The positive or negative and size of the difference directly reflect whether the new energy station needs to adjust the power according to the forecast, as well as the direction and amplitude of the adjustment. If the difference is positive, it means that the predicted power generation is higher than the command value, and the energy-consuming resistor may be required to consume the excess power; if the difference is negative, it means that the predicted power generation is lower than the command value, and other measures (such as discharging the energy storage system to supplement the power, etc.) may need to be taken to meet the command requirements. Accurate calculation of the predicted power generation difference is the key link in the subsequent judgment of whether to start the energy-consuming resistor and determine its conduction power.

[0099] Step S143, determining whether the predicted generated power difference is greater than or equal to a power difference threshold.

[0100] If the predicted power generation difference is greater than or equal to the threshold, it means that according to the forecast, the station power generation may exceed the expected range of the power grid, and the degree of deviation has reached the level that requires intervention and adjustment. At this time, the energy-consuming resistor should be started for pre-adjustment; conversely, if the difference is less than the threshold, it means that although the predicted power generation deviates from the command value, it is within an acceptable range. In this case, the energy-consuming resistor control can be temporarily suspended and a decision can be made after the actual power generation situation is further clarified.

[0101] Step S144: if yes, then in the current control cycle, the energy dissipation resistor that can consume the power corresponding to the difference between the predicted power generation and the predicted power generation is controlled to be turned on, so as to consume the power generated by the predicted power generation difference.

[0102] First, the number or combination of energy-consuming resistors that need to be turned on should be determined based on the size of the predicted power difference, and accurate power consumption control can be achieved through reasonable calculation and allocation. At the same time, during the operation of the energy-consuming resistor, the power consumed by it should be monitored in real time. Although the control is based on the predicted value, it is still necessary to ensure that the actual power consumption is consistent with the expected adjustment power to prevent excessive power regulation deviations due to factors such as resistor aging and ambient temperature changes, which will affect the balance between the station's power output value and the power command value.

[0103] In addition, the AGC control method for new energy stations using energy-consuming resistors also includes: when one or more of the several energy-consuming resistors are in a short-circuit or open-circuit state, reallocating the actual power generation difference to several energy-consuming resistors in a normal state.

[0104] In the AGC control process of the new energy station, the energy dissipation resistor component plays a key role in power regulation. However, due to various reasons (such as component aging caused by long-term operation, overcurrent shock, poor heat dissipation, etc.), the energy dissipation resistor may have a short circuit or open circuit fault. When this happens, the power share originally planned to be consumed by the faulty resistor cannot be realized, which will cause the entire power regulation system to be unbalanced, and the deviation between the power generation output value of the new energy station and the power generation command value cannot be effectively corrected. Therefore, it is necessary to detect the faulty resistor in time and redistribute the actual power generation difference share originally allocated to the faulty resistor to other energy dissipation resistors in normal state to ensure the continued effectiveness of the power regulation function, maintain the station output power within the range required by the power grid, and ensure the stable operation of the power system. For example, if an energy dissipation resistor is short-circuited, it may cause the current to increase abnormally, not only will it be unable to consume power normally for regulation, but it may also affect the safety of the entire circuit. At this time, redistributing the power difference can avoid the failure of the entire power regulation due to the faulty resistor.

[0105] The above detection process can be carried out by combining multiple detection methods, such as connecting a voltage monitoring device in parallel at both ends of each energy-consuming resistor. When the resistor is working normally, the voltage at both ends should be within a certain expected range. If a short circuit occurs, the voltage will drop sharply to near zero; if a circuit is broken, the voltage will rise to near the power supply voltage. At the same time, a current monitoring device is connected in series to judge the working state of the resistor by monitoring the current size and change trend; once an abnormal current or voltage is detected, a fault alarm signal is immediately triggered, and the location of the faulty resistor is determined by circuit topology analysis and data comparison. In addition, infrared thermal imaging technology can be used to regularly inspect energy-consuming resistors, because the faulty resistor will generate abnormally high temperature due to excessive current when short-circuited, and the temperature will be lower than the normal working resistor when the circuit is broken because there is no current passing. Potential faulty resistors can be quickly discovered through thermal imaging image analysis. This non-contact detection method can warn of faults in advance without affecting the normal operation of the circuit.

[0106] Accordingly, please refer to Figure 2 A second aspect of an embodiment of the present invention provides an AGC control device for a new energy station using an energy-consuming resistor. An energy-consuming resistor component is provided on the inverter output side of the new energy station. The energy-consuming resistor component includes a plurality of energy-consuming resistors. The device includes:

[0107] The difference calculation module 1 is used to obtain the real-time value of the power generation of the new energy station in the current control cycle, and calculate the actual power generation difference based on the power generation command value received by the new energy station;

[0108] Threshold determination module 2, which is used to determine whether the actual generated power difference is greater than or equal to the power difference threshold;

[0109] Energy consumption control module 3, which is used to control the energy consumption resistor that can consume power corresponding to the actual power difference to conduct when the actual power difference is greater than or equal to the power difference threshold, consume the power generated by the actual power difference, and balance the power output value of the new energy station with the power command value;

[0110] The energy consumption control module 3 is also used to maintain the current operating state of the energy consumption resistor component when the actual generated power difference is less than the power difference threshold.

[0111] Accordingly, a third aspect of an embodiment of the present invention provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the above-mentioned new energy station AGC control method using energy-consuming resistors.

[0112] Correspondingly, a fourth aspect of an embodiment of the present invention provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the above-mentioned new energy station AGC control method using energy-consuming resistors.

[0113] The embodiment of the present invention aims to protect an AGC control method and device for a new energy station using an energy-consuming resistor. An energy-consuming resistor component is provided on the inverter output side of the new energy station. The energy-consuming resistor component includes a plurality of energy-consuming resistors. The method includes the following steps: obtaining the real-time value of the power generation of the new energy station in the current control cycle, and calculating the actual power generation difference based on the power generation command value received by the new energy station; judging whether the actual power generation difference is greater than or equal to the power difference threshold; if so, controlling the energy-consuming resistor that can consume power corresponding to the actual power generation difference to conduct, consuming the power generated by the actual power generation difference, so that the power generation output value of the new energy station and the power generation command value are balanced; if not, maintaining the current operating state of the energy-consuming resistor component. The above technical scheme has the following effects:

[0114] 1. By setting an energy-consuming resistor component on the output side of the inverter, the energy-consuming resistor can intervene in time when the actual power generation exceeds the command value to consume excess power, overcome the volatility and intermittent problems brought by renewable energy power generation, achieve rapid and accurate adjustment of the station output power, ensure the matching of output power with the command value, and help maintain the power balance of the power system;

[0115] 2. It helps to improve the stability of the entire power system, use energy-consuming resistors to consume excess power in a timely manner, avoid the impact of power mutations on the power grid caused by new energy sites, and prevent power mutations from causing power grid frequency fluctuations and voltage instability, so that the key operating parameters of the power grid, such as frequency and voltage, can be maintained within a relatively stable and reasonable range, ensuring the safe and stable operation of the power system;

[0116] 3. The components composed of multiple energy-consuming resistors increase the flexibility of control. According to the size of the actual power generation difference, the energy-consuming resistors with corresponding quantity or power capacity can be selected to be turned on, so as to realize the classification and precise control of different degrees of power surplus. It can better adapt to the complex and changeable power generation changes of new energy sites and meet the diverse power regulation needs.

[0117] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0118] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0119] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0120] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A new energy station AGC control method using energy-consuming resistors, characterized in that: An energy-consuming resistor component is provided on the output side of the inverter of the new energy station, and the energy-consuming resistor component includes a plurality of energy-consuming resistors. The method includes the following steps: Obtain the real-time value of the power generation of the new energy station in the current control cycle, and calculate the actual power generation difference based on the power generation command value received by the new energy station; Determining whether the actual generated power difference is greater than or equal to a power difference threshold; If so, the energy dissipation resistor capable of consuming power corresponding to the actual power generation difference is controlled to be turned on, and the power generation power of the actual power generation difference is consumed, so that the power generation output value of the new energy station and the power generation command value are balanced; If not, the current operating state of the energy dissipation resistor component is maintained.

2. The AGC control method for a new energy station using an energy-consuming resistor according to claim 1 is characterized in that: Before the control of turning on the energy dissipation resistor that can consume power corresponding to the difference between the actual generated power and the actual generated power, the method further includes: Obtaining a deviation ratio value between actual power consumption and theoretical power consumption of each energy dissipation resistor, wherein the deviation ratio value S=(actual power consumption / theoretical power consumption); The corresponding share of the actual power generation difference value allocated to the corresponding energy dissipation resistor is calibrated based on the deviation ratio value.

3. The AGC control method for a new energy station using an energy-consuming resistor according to claim 2 is characterized in that: The step of obtaining the deviation ratio between the actual power consumption of each energy dissipation resistor and the theoretical power consumption includes: Acquire the real-time temperature value and the real-time voltage value of the energy-consuming resistor and the real-time frequency value of the circuit where the energy-consuming resistor is located; Based on the real-time temperature value, the real-time voltage value and the real-time frequency value, a deviation ratio value between the actual power consumption of the energy dissipation resistor and the theoretical power consumption is calculated.

4. The AGC control method for a new energy station using an energy-consuming resistor according to claim 3 is characterized in that: The calculation formula of the deviation ratio between the actual power consumption of the energy dissipation resistor and the theoretical power consumption is: Among them, S is the deviation ratio value, R0 is the resistance value of the energy dissipation resistor at the reference temperature T0, T is the length of the control cycle, U m is, ΔU(t) is the voltage amplitude fluctuation, ω=2πf is the angular frequency, Δω(t) is the angular frequency fluctuation, is the initial phase, is the initial phase fluctuation, α is the temperature coefficient of resistance, T real is the actual temperature value of the energy dissipation resistor, T0 is the reference temperature value of the energy dissipation resistor, L is the inductance value of the circuit where the energy dissipation resistor is located, and C is the capacitance value of the circuit where the energy dissipation resistor is located.

5. The AGC control method for a new energy station using an energy-consuming resistor according to claim 4 is characterized in that: Before calculating the deviation ratio between the actual power consumption of the energy dissipation resistor and the theoretical power consumption, the method further includes: Obtaining the usage time of the energy-consuming resistor; Calculating an aging coefficient of the energy-consuming resistor based on the used time; In combination with the aging coefficient, calculating the deviation ratio between the actual power consumption of the energy dissipation resistor and the theoretical power consumption; The calculation formula of the deviation ratio between the actual power consumption of the energy dissipation resistor and the theoretical power consumption is: Where k is the aging rate constant of the energy dissipation resistor, t use is the usage time of the energy consumption resistor.

6. The AGC control method for a new energy station using an energy-consuming resistor according to any one of claims 1 to 5, characterized in that: Before obtaining the real-time value of the power generation of the new energy station in the current control cycle, the method further includes: In the previous control cycle, obtaining a predicted value of the power generation of the new energy station in the current control cycle; Calculating the difference between the predicted power generation value of the current control cycle and the predicted power generation command value; Determining whether the predicted generated power difference is greater than or equal to a power difference threshold; If so, in the current control cycle, the energy dissipation resistor that can consume power corresponding to the predicted power generation difference is controlled to be turned on to consume the power generated by the predicted power generation difference.

7. The AGC control method for a new energy station using an energy-consuming resistor according to any one of claims 1 to 5, characterized in that: Also includes: When one or more of the plurality of energy-consuming resistors are in a short-circuit or open-circuit state, the actual power generation difference is redistributed to the plurality of energy-consuming resistors in a normal state.

8. A new energy station AGC control device using energy-consuming resistors, characterized in that: The inverter output side of the new energy station is provided with an energy dissipation resistor component, the energy dissipation resistor component includes a plurality of energy dissipation resistors, and the device includes: A difference calculation module is used to obtain the real-time value of the power generation of the new energy station in the current control cycle, and calculate the actual power generation difference based on the power generation command value received by the new energy station; A threshold judgment module, which is used to judge whether the actual generated power difference is greater than or equal to a power difference threshold; An energy consumption control module, which is used to control the energy consumption resistor that can consume power corresponding to the actual power difference to be turned on when the actual power difference is greater than or equal to the power difference threshold, so as to consume the power generated by the actual power difference and balance the power output value of the new energy station with the power command value; The energy consumption control module is further configured to maintain the current operating state of the energy consumption resistor component when the actual generated power difference is less than the power difference threshold.

9. An electronic device, characterized in that: include: at least one processor; And a memory connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the new energy station AGC control method using energy-consuming resistors as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: Computer instructions are stored thereon, and when the instructions are executed by the processor, the AGC control method for a new energy station using energy-consuming resistors as described in any one of claims 1-7 is implemented.

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