Broadband multi-modal electric power load precision regulation system and method

Abstract

The present application relates to a kind of broadband multi-modal electric power load precision regulating system and method, belong to generator and energy storage system test technical field.The method according to the system implements the following operation: based on power grid power supply, voltage is converted into alternating current by transformer, then alternating current is converted into adjustable direct current using fully controlled rectifier;Frequency of the tested generator is changed by adjusting the speed of drag motor through frequency converter driving drag motor;At the same time, the output voltage of the tested generator is controlled using excitation system;Load regulation is realized according to integrated multiple loads and static var compensator;Voltage and frequency on bus are monitored in real time through measurement and control system, and input proportion of each load is gradually adjusted according to test requirement;Voltage size and phase on alternating current side are adjusted using SVC, power factor and current size on branch line are controlled in real time;And excess electric energy is rectified into direct current and stored in battery pack and capacitor pack through energy feedback function of SVC.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of generator and energy storage system test, and relates to a wide frequency domain multi-mode electric power load precise regulation system and method. BACKGROUND

[0002] In modern power systems, generator testing is a key link to ensure the performance and stability of power generation equipment. Traditionally, electronic resistors, water resistors and reactors are widely used as test loads. These loads consume the electrical energy generated by the generator by converting it into heat, achieving the purpose of testing. However, this method not only has low energy utilization rate, which does not meet the current green and low-carbon development requirements, but also faces many challenges in the operation process.

[0003] First, during the test process, the corresponding load type is usually selected according to the capacity of the generator, and loading is performed through gear adjustment. This method relies on manual adjustment and cannot achieve stepless adjustment, and the adjustment accuracy is insufficient, affecting the accuracy of the test results. Especially under the demand of high-precision testing, the traditional adjustment method is particularly limited.

[0004] Secondly, when the reactor is used as a load, its applicability is significantly limited. The impedance value of the reactor changes with frequency, which means it can only work effectively at the rated frequency. However, for some special power generation equipment, such as wave power generators, their output frequency often fluctuates within a certain range. Due to the significant change in impedance of the reactor at different frequencies, the test process is uncontrollable, and it cannot meet the testing requirements under the condition of variable frequency.

[0005] In the loading test of energy storage systems, the battery is usually charged or the electrical energy is directly injected into the power grid. However, these methods cannot accurately adjust the content of resistance, reactance and nonlinear load in the test load, and cannot effectively control the power factor of the system, so they cannot accurately test the electrical performance of the energy storage system (such as emergency power supply), including power factor control and power quality. In addition, directly injecting electrical energy into the power grid may cause harmonic pollution, threatening the safety and stability of the power grid. SUMMARY

[0006] In view of this, the purpose of the present application is to provide a wide frequency range multi-modal electric power load precise regulation system and method. The present application proposes an innovative solution, which introduces high-precision electronic resistance load, high-power metal resistance load and reactor, and connects them flexibly in series and parallel through switches. Combined with program control, the system can perform stepless regulation under different voltage levels, arbitrary power factor and capacity conditions. More importantly, the system also integrates static var generator (SVC), enabling it to achieve stepless regulation within a wide frequency range. This multi-modal system not only accurately regulates active and reactive power, but also adapts to various frequency range generator test requirements, ensuring high precision and controllability during the test process. This innovative multi-modal system achieves precision and applicability that traditional methods cannot achieve through flexible combination and intelligent control, greatly improving the efficiency and reliability of power testing. It not only meets the current green and low-carbon environmental protection requirements, but also provides an efficient, precise and controllable electric power regulation solution, with wide application prospects and significant technical advantages.

[0007] To achieve the above purpose, the present application provides the following technical solutions:

[0008] A wide frequency range multi-modal electric power load precise regulation system, comprising: a power grid power supply, a transformer T1, a full-controlled rectifier, a power supply bus, a frequency converter, a drag motor, a test generator, an excitation system, a test emergency power supply, a battery pack and a capacitor pack, an output bus, a measurement and control system, a reactor load, a metal load, an electronic resistance load, a static var compensator SVC, and a circuit breaker group for adjusting the load ratio, wherein the power supply bus is divided into a power grid power supply side and a test device side, and the power grid power supply, the transformer T1 and the full-controlled rectifier are connected in series between the power supply bus; the test device side of the power supply bus is connected to at least the test generator, and the frequency converter and the drag motor are connected in series on the connection line from the power supply bus to the test generator; the test device side of the power supply bus is connected to at least the battery pack and the capacitor pack and the static var compensator SVC, the static var compensator SVC has an energy feedback function and can rectify excess power into direct current and store it in the battery pack and the capacitor pack; the current generated by the test generator and / or the test emergency power supply is output to the output bus, and the reactor load, the metal load, the electronic resistance load and the static var compensator SVC are connected in parallel to the output bus; the measurement and control system obtains the voltage and frequency on each branch from the reactor load, the metal load, the electronic resistance load and the static var compensator SVC parallel branch; the measurement and control system can control the load value of the reactor load, the metal load, the electronic resistance load and the static var compensator SVC.

[0009] Furthermore, the frequency converter is used to convert the DC power on the power bus into AC power to drive the traction motor and adjust the speed of the traction motor. The traction motor is used to adjust the frequency of the tested generator; the output voltage of the tested generator is controlled by the excitation system to which it is connected.

[0010] Furthermore, the output busbar can be adjusted within a voltage range of 380V to 1000V and a frequency range of 50Hz to 500Hz, and the switches in the circuit breaker group control the on-off of the circuits between the inductive load, the metal load, the electronic resistance load and the output busbar.

[0011] Furthermore, the measurement and control system, as the core of the entire solution, is responsible for real-time monitoring and control of the system's operating parameters, including voltage, frequency, and load input ratio. Through intelligent control methods, the measurement and control system can automatically adjust the input of each load and achieve power factor optimization and efficient energy utilization through feedback control of the static VAR compensator (SVC).

[0012] Furthermore, the transformer T1 is used to convert the 10kV grid power into 1000V AC power, and the fully controlled rectifier is used to convert the 1000V AC power into an adjustable DC power of 380V to 1400V.

[0013] The present invention proposes a wide-band multi-mode electric power load precise regulation method based on a wide-band multi-mode electric power load precise regulation system, the method comprising:

[0014] Based on the grid power supply, the voltage is converted into AC power through transformer T1, and then the AC power is converted into adjustable DC power using a fully controlled rectifier;

[0015] The frequency converter is used to drive the traction machine and adjust the speed of the traction machine to change the frequency of the tested generator; at the same time, the excitation system is used to control the output voltage of the tested generator;

[0016] Load regulation is achieved based on integrated reactive loads, metal resistance loads, electronic resistance loads, and static VAR compensators. The voltage and frequency on the bus are monitored in real time through the measurement and control system, and the input ratio of each load is gradually adjusted according to test requirements.

[0017] The SVC is used to adjust the voltage and phase on the AC side, and to control the power factor and current on the branch line in real time; and through the energy feedback function of the SVC, the excess electric energy is rectified into DC power and stored in the battery pack and capacitor bank.

[0018] The beneficial effects of the present invention are:

[0019] The wide-band multi-modal electric power load precision regulation system and method of the present invention demonstrates significant technical effects in multiple aspects:

[0020] 1. Improved energy efficiency: By introducing a static VAR compensator (SVC) to achieve energy feedback, excess power is rectified into DC power and stored in batteries and capacitors, significantly improving energy efficiency. This design not only conforms to the green and low-carbon environmental concept, but also reduces energy waste and achieves sustainable energy management.

[0021] 2. Achieve high-precision and stepless regulation: The system automatically adjusts the reactive load, metal resistor load, electronic resistor load, and SVC input ratio through the measurement and control system, enabling precise adjustment from small to large. Compared to traditional manual adjustment methods, this invention provides higher regulation accuracy, ensuring precise control of active and reactive power, and meeting diverse testing requirements.

[0022] 3. Wide Frequency Range: By adjusting the motor speed via a frequency converter to change the frequency of the generator under test, and combining this with the excitation system to control the output voltage, the system can meet testing requirements for voltages from 380V to 1000V and frequencies from 50Hz to 500Hz. This wide frequency range adaptability enables the system to test a variety of power generation equipment, including wave generators, and solves the problem of impedance changes in traditional reactors at different frequencies.

[0023] 4. Intelligent and automated control: This invention uses a measurement and control system to monitor key parameters such as bus voltage, frequency, and power factor in real time, automatically adjusting the input ratio of each load to ensure stable system operation. Intelligent and automated control not only reduces human intervention and operational difficulty, but also improves the accuracy and reliability of test results.

[0024] 5. Optimizing Power Factor and Power Quality: The SVC optimizes the power factor and current on the branch line by adjusting the AC voltage and phase in real time. This function not only ensures the accuracy of the energy storage system's electrical performance testing, but also improves power quality and avoids the risk of directly injecting harmonics into the grid, which could threaten grid security.

[0025] 6. Improved system flexibility and reliability: Through flexible combination and intelligent control, the system achieves adjustment accuracy and applicability that cannot be achieved by traditional methods. It can quickly respond to changes in different test conditions and ensure high precision and controllability during the test process. The overall system design and control strategy greatly improves its operational reliability and flexibility.

[0026] In summary, the present invention significantly improves the performance and applicability of the electric power load regulation system through innovative technical solutions and intelligent control means, meets the modern power system's requirements for efficient, accurate, and environmentally friendly testing, and demonstrates superior technical effects and broad application prospects.

[0027] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0029] Figure 1 Schematic diagram of the simplified structure of the wide-band multi-modal electric power load precision regulation system of the present invention. DETAILED DESCRIPTION

[0030] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0032] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] See also Figure 1 , which is a wide-band multi-modal electric power load precision regulation system and method.

[0034] Example 1

[0035] This embodiment introduces in detail the wide frequency domain multi-mode electric power load precise regulation system proposed by the present invention. Figure 1 As shown, the wide-band multi-modal electric power load precision regulation system of the present invention includes at least a grid power supply, a transformer T1, a fully controlled rectifier, a power bus, a frequency converter, a traction machine, a tested generator, an excitation system, a tested emergency power supply, a battery pack and a capacitor pack, an output bus, a measurement and control system, an inductive load, a metal load, an electronic resistance load, a static VAR compensator SVC, and a circuit breaker group for adjusting the load ratio.

[0036] The power bus is divided into the grid power side and the test equipment side. The power bus is connected to the 10kV AC grid power on the grid power side. Transformer T1 and a fully-controlled rectifier are connected in series between the grid power and the power bus. Transformer T1 is used to convert the 10kV grid power into 1000V AC power, and the fully-controlled rectifier is used to convert the 1000V AC power into an adjustable DC power of 380V to 1400V.

[0037] At least one generator under test is connected to the device under test side of the power bus. The connection line from the power bus to the generator under test is connected in series with a frequency converter and a traction motor. The frequency converter converts the DC power on the power bus into AC power to drive the traction motor and adjusts its speed. The traction motor adjusts the frequency of the generator under test. The excitation system connected to the generator under test controls its output voltage, ensuring that the generator under test can meet the test requirements of 380V to 1000V and 50Hz to 500Hz.

[0038] The test equipment side of the power bus is connected to at least a battery bank, a capacitor bank and a static VAR compensator SVC. The static VAR compensator SVC has an energy feedback function and can rectify excess electric energy into direct current and store it in the battery bank and the capacitor bank.

[0039] In addition, the current generated by the tested generator and / or tested emergency power supply is output to the output bus, which is adjustable within a voltage range of 380V to 1000V and a frequency range of 50Hz to 500Hz. Simultaneously, a reactance load, a metal load, an electronic resistance load, and a static VAR compensator (SVC) are connected in parallel to the output bus. Switches in the circuit breaker group control the circuits between the reactance load, metal load, electronic resistance load, and the output bus.

[0040] The measurement and control system regulates the switches in the circuit breaker group and also controls the load values ​​of the reactor loaders, metal loaders, electronic resistor loaders, and static VAR compensators (SVCs). Simultaneously, the system obtains the voltage and frequency of each of these parallel branches. As the core of the entire solution, the measurement and control system is responsible for real-time monitoring and control of the system's operating parameters, including voltage, frequency, and load input ratio. Through intelligent control, the measurement and control system automatically adjusts the input of each load to ensure stable system operation. Through SVC feedback control, it optimizes the power factor and achieves efficient energy utilization.

[0041] Example 2

[0042] This embodiment describes in detail the wide-frequency domain multi-modal electric power load precise adjustment method of the present invention based on the wide-frequency domain multi-modal electric power load precise adjustment system given in Example 1.

[0043] The present invention's wide-band, multi-modal electric power load precision regulation method includes at least the following steps: Based on a 10kV grid power source, the voltage is converted to 1000V AC via a T1 transformer. Next, a fully-controlled rectifier is used to convert the 1000V AC into a DC power supply adjustable from 380V to 1400V to match the voltage of the test sample. This flexible voltage regulation range can accommodate a variety of generator testing requirements.

[0044] To achieve frequency adjustability, the system uses a frequency converter to drive the motor and adjust its speed, thereby varying the frequency of the generator under test. Simultaneously, the excitation system controls the generator's output voltage, ensuring the system can meet testing requirements for voltages ranging from 380V to 1000V and frequencies from 50Hz to 500Hz. This design ensures the system's wide applicability across diverse voltage and frequency conditions.

[0045] For load regulation, the system integrates reactive loads, metallic resistor loads, electronic resistor loads, and a static VAR compensator (SVC). The measurement and control system monitors the voltage and frequency on the busbar in real time and gradually adjusts the input ratio of each load based on test requirements. Reactive loads provide reactive power support, metallic resistor loads are suitable for high-power coarse regulation, and electronic resistor loads are used for high-precision fine regulation. The SVC adjusts the voltage and phase on the AC side to control the power factor and current on the branch line in real time, further optimizing system operation.

[0046] Furthermore, the SVC features energy regeneration, converting excess electrical energy into direct current (DC) and storing it in batteries and capacitors. This not only enables efficient energy utilization and storage, but also improves the overall energy efficiency of the system, meeting green and low-carbon environmental requirements.

[0047] In summary, the wide-band, multi-modal, precise electric power load regulation system of the present invention, through flexible combination and intelligent control, achieves high-precision active and reactive power regulation, adapting to the requirements of generator testing across different frequency ranges and ensuring high precision and controllability during the testing process. Furthermore, through energy feedback and efficient utilization, the system's energy efficiency is significantly improved, offering significant environmental and economic benefits, providing a highly efficient, precise, and controllable electric power regulation solution.

[0048] The present invention solves several technical problems existing in current generator tests and energy storage system loading tests:

[0049] 1. Green and low-carbon energy consumption: Traditional testing methods convert electrical energy into heat through electronic resistors, water resistors, and reactors, which cannot meet green and low-carbon environmental protection requirements. This invention uses a static VAR compensator (SVC) to achieve energy feedback, rectifying excess electrical energy into DC power and storing it in batteries and capacitors. This greatly improves energy utilization efficiency and conforms to the green and low-carbon environmental protection concept.

[0050] 2. High-precision and stepless regulation: Traditional load regulation methods rely on manual adjustment, which cannot achieve stepless adjustment and has insufficient adjustment accuracy. The present invention uses a measurement and control system to automatically adjust the input ratio of the reactance load, metal resistance load, electronic resistance load, and SVC, achieving gradual and precise adjustment from small to large, ensuring high-precision active and reactive power control.

[0051] 3. Wide-frequency applicability: Traditional reactors, as loads, can only operate effectively at rated frequencies and are unable to meet the testing requirements for equipment with a wide output frequency range, such as wave generators. This invention uses a frequency converter to adjust the motor speed to change the frequency of the generator under test, and controls the output voltage through the excitation system. This meets the testing requirements for voltages from 380V to 1000V and frequencies from 50Hz to 500Hz, making it suitable for testing generators across a wide frequency range.

[0052] 4. Intelligent and automated control: Traditional manual load adjustment is not only time-consuming and labor-intensive, but also prone to human error, affecting the accuracy of test results. This invention uses a measurement and control system to monitor bus voltage, frequency, power factor, and other parameters in real time, automatically adjusting the load ratio to ensure stable system operation, reduce human intervention, and improve test accuracy and reliability.

[0053] 5. Power Factor and Power Quality Control: During energy storage system loading tests, traditional methods cannot accurately adjust the resistance, reactance, and nonlinear load content of the test load, making it difficult to control the system's power factor, which in turn affects power quality. This invention uses an SVC to control the AC side voltage and phase in real time, optimizing the branch line power factor and current. Furthermore, an energy feedback system improves power utilization, ensuring accurate electrical performance testing of the energy storage system, including performance indicators such as power factor control and power quality.

[0054] By solving the above technical problems, the present invention significantly improves the performance and applicability of the electric power load regulation system, and meets the modern power system's requirements for efficient, accurate, and environmentally friendly testing.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A broadband multi-modal electric power load precision regulation system, characterized by: It includes: Grid power supply, transformer T1, fully controlled rectifier, power bus, inverter, traction machine, tested generator, excitation system, tested emergency power supply, battery pack and capacitor pack, output bus, measurement and control system, reactance load, metal load, electronic resistance load, static VAR compensator SVC and circuit breaker group for adjusting load ratio, among which, The power bus is divided into the grid power side and the test equipment side. The transformer T1 and the fully controlled rectifier are connected in series between the grid power and the power bus. The tested equipment side of the power bus is connected to at least the tested generator, and the connection line from the power bus to the tested generator is connected in series with a frequency converter and a traction machine in sequence; The test equipment side of the power bus is connected to at least a battery bank, a capacitor bank, and a static VAR compensator (SVC). The static VAR compensator (SVC) has an energy feedback function and can rectify excess electrical energy into DC power and store it in the battery bank and capacitor bank. The current generated by the tested generator and / or tested emergency power supply is output to the output bus, and the reactance load, metal load, electronic resistance load, and static VAR compensator (SVC) are connected in parallel to the output bus; The measurement and control system obtains the voltage and frequency on each branch from the parallel branches of the reactance load, metal load, electronic resistance load, and static VAR compensator SVC; the measurement and control system can adjust the load value of the reactance load, metal load, electronic resistance load, and static VAR compensator SVC.

2. The wide-band multi-modal electric power load precision regulation system according to claim 1, characterized in that: The inverter is used to convert the DC power on the power bus into AC power to drive the traction motor and adjust the speed of the traction motor. The traction motor is used to adjust the frequency of the tested generator; the output voltage of the tested generator is controlled by the excitation system to which it is connected.

3. The wide-band multi-modal electric power load precision regulation system according to claim 1, characterized in that: The output busbar can be adjusted within the voltage range of 380V to 1000V and the frequency range of 50Hz to 500Hz. The switches in the circuit breaker group control the circuit between the inductive load, the metal load, the electronic resistance load and the output busbar.

4. The wide-band multi-modal electric power load precision regulation system according to claim 1, characterized in that: As the core of the entire solution, the measurement and control system is responsible for real-time monitoring and control of the system's operating parameters, including voltage, frequency, and load input ratio. Through intelligent control methods, the measurement and control system can automatically adjust the input of each load and achieve power factor optimization and efficient energy utilization through feedback control of the static VAR compensator (SVC).

5. The wide-band multi-modal electric power load precision regulation system according to claim 1, characterized in that: Transformer T1 is used to convert 10kV grid power into 1000V AC power, and the fully controlled rectifier is used to convert 1000V AC power into adjustable DC power of 380V to 1400V.

6. A method for regulating a wide-band multi-modal electric power load precision regulation system according to any one of claims 1 to 5, characterized in that: The method comprises: Based on the grid power supply, the voltage is converted into AC power through transformer T1, and then the AC power is converted into adjustable DC power using a fully controlled rectifier; The frequency converter is used to drive the traction machine and adjust the speed of the traction machine to change the frequency of the tested generator; at the same time, the excitation system is used to control the output voltage of the tested generator; Load regulation is achieved based on integrated reactive loads, metal resistance loads, electronic resistance loads, and static VAR compensators. The voltage and frequency on the bus are monitored in real time through the measurement and control system, and the input ratio of each load is gradually adjusted according to test requirements. The SVC is used to adjust the voltage and phase on the AC side, and to control the power factor and current on the branch line in real time; and through the energy feedback function of the SVC, the excess electric energy is rectified into DC power and stored in the battery pack and capacitor bank.

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