CN104298127A - Micro-grid semi-digital semi-physical real-time simulation system based on RT-LAB - Google Patents

Abstract

The invention discloses an RT-LAB-based microgrid half-digital half-physical real-time simulation system. The RT-LAB simulator includes the microgrid module and each primary equipment module under the microgrid module. The microgrid module is connected to each primary equipment module, and each primary equipment module is connected to its corresponding primary control module. All primary control modules All are connected to the secondary control module, and the secondary control module is connected to the computer; the primary control module, the secondary control module, and the computer are all connected through switches to form an Ethernet network. The invention can be used to simulate the dynamic characteristics of the micro-grid, and can also simulate the control method, which has good flexibility. The RT-LAB simulator is used to simulate the primary equipment of the micro-grid, and the micro-grid such as photovoltaic power generation, wind power generation, and diesel engine power generation can be controlled anytime and anywhere. The dynamic simulation of the power grid model and the verification and expansion of the model form a highly versatile half-digital and half-physical simulation system for micro-grids.

Description

RT-LAB-based real-time simulation system of half-digital and half-physical microgrid

technical field

The invention relates to a micro-grid simulation system, in particular to an RT-LAB-based micro-grid half-digital half-physical real-time simulation system, which uses industrial-grade simulation tools to simulate the micro-grid.

Background technique

With the development of the national economy, the electric power industry continues to grow, the power system is also gradually large, and its operation is more complicated. In order to ensure the reliable, safe and economical operation of the power system, the static and dynamic characteristics of the actual power system must be accurately and completely investigated when planning, analyzing and studying the power system. However, traditional analysis methods are difficult to accurately describe these characteristics and predict future accidents. At the same time, the particularity of the power system itself determines that it is difficult to use experimental methods to realize system analysis, and simulation means must be used. This requires a powerful simulation tool to analyze the operation of the actual power system. Therefore, simulation technology research has become a new trend in power system analysis.

RT-LAB is a distributed real-time simulation platform. It can transplant the Simulink or SystemBuild dynamic model to the hardware-in-the-loop real-time simulation system at a relatively low cost in a short period of time, thus simplifying the process of simulation design. Whether it is used for real-time hardware-in-the-loop simulation or to accelerate the execution, control and testing of simulation models, it is flexible enough to be applied to the most complex simulation and control problems. At the same time, RT-LAB provides an effective tool for real-time simulation of highly complex models. It can exchange information through ultra-low latency technology. In addition, RT-LAB's modular design can minimize computing requirements and provide simulation modules that just meet application requirements, thereby meeting users' price needs. Therefore, RT-LAB has better flexibility in the market.

RT-LAB microgrid model simulation is still in the field of continuous development and improvement in China, and the relevant literature and theory are not yet complete. At present, there is still a lack of related hardware and software integrated products for the microgrid simulation platform in the domestic market, and there is a great demand for related scientific research and market.

Contents of the invention

Based on the deficiencies of the prior art, the present invention proposes a system that utilizes an industrial simulation system to perform real-time simulation tests on the microgrid model, uses industrial-grade simulation tools to simulate the microgrid, and utilizes the RT-LAB simulator, which can Perform real-time simulation of complex microgrid operations to verify the rationality of the developed algorithms, greatly speed up the research on microgrids and reduce scientific research costs, and provide a large amount of technical reference data for the design and improvement of existing microgrids.

In order to realize the foregoing invention object, the present invention adopts following technical scheme:

Including RT-LAB simulator, RT-LAB simulator includes microgrid module and each primary equipment module under the microgrid module;

Including the first-level control module connected with each primary equipment module in the RT-LAB simulator, the first-level control module receives the simulation data of the primary equipment module for processing and conversion, outputs active power and reactive power to the second-level control module, and receives the second-level control module The feedback PWM control signal of the stage control module is sent to the primary equipment module;

Including the secondary control module connected to all the primary control modules, the secondary control module receives the active power and reactive power output by the primary control module, and at the same time receives the real-time monitoring data of the microgrid module, and outputs it to the RT-LAB simulator after processing The real-time monitoring data to the computer; and receive the tie line power control signal and the micro grid operation mode control signal output by the computer; and output the tie line circuit breaker opening and closing control signal to the micro grid module of the RT-LAB simulator;

It includes a computer connected to the secondary control module. The computer receives the detection data of the primary equipment module and the microgrid module, and generates tie line power control signals and microgrid operation mode control signals after processing, which are fed back to the secondary control module.

The first-level control module, the second-level control module, and the computer are all connected to each other through a switch to form an Ethernet network.

The Ethernet network performs data transmission through the UDP transmission protocol.

The simulation data includes voltage signals and current signals.

The real-time monitoring data of the micro-grid module includes micro-grid voltage, micro-grid frequency, and tie-line power.

The real-time monitoring data of the RT-LAB simulator includes microgrid frequency, microgrid voltage, microgrid tie line power and power of each primary equipment module.

Both the first-level control module and the second-level control module use DSP.

The first-level control module is provided with an A/D interface, an SPI interface and an I/O interface.

The secondary control module is provided with an A/D interface and an I/O interface.

The beneficial effects of the present invention are:

The invention can be used to simulate the dynamic characteristics of the micro-grid, and can also simulate the control method, and has better flexibility. The RT-LAB simulator is used to simulate the primary equipment of the micro-grid to form a semi-digital and semi-physical simulation system of the micro-grid with strong versatility.

The invention can perform dynamic simulation, data analysis and output display on the micro grid model in a very short time and with very little risk. This simulation platform has the characteristics of good versatility and easy operation, which can shorten the research and development cycle of key equipment of microgrid at a small cost, and the developed platform can fill the gap in the market.

The invention has better flexibility, can perform dynamic simulation and verification expansion of micro-grid models such as photovoltaic power generation, wind power generation, and diesel engine power generation anytime and anywhere, accelerates scientific research and product development in related fields, and has a wide range of applications.

Description of drawings

Fig. 1 is a schematic diagram of the connection structure of the present invention.

Fig. 2 is a schematic diagram of the overall structure of the present invention.

Figure 3 is a schematic diagram of the specific connection between the primary control module and the RT-LAB simulator.

Figure 4 is a schematic diagram of the specific connection between the secondary control module and the RT-LAB simulator.

Detailed ways

The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Fig. 1 and Fig. 2, simulation system of the present invention is as follows:

Including RT-LAB simulator, RT-LAB simulator includes microgrid module and each primary equipment module under the microgrid module;

Including the first-level control module connected with each primary equipment module in the RT-LAB simulator, the first-level control module receives the simulation data of the primary equipment module for processing and conversion, outputs active power and reactive power to the second-level control module, and receives the second-level control module The feedback PWM control signal of the stage control module is sent to the primary equipment module;

Including the secondary control module connected to all the primary control modules, the secondary control module receives the active power and reactive power output by the primary control module, and at the same time receives the real-time monitoring data of the microgrid module, and outputs it to the RT-LAB simulator after processing The real-time monitoring data to the computer; and receive the tie line power control signal and the micro grid operation mode control signal output by the computer; and output the tie line circuit breaker opening and closing control signal to the micro grid module of the RT-LAB simulator;

It includes a computer connected to the secondary control module. The computer receives the detection data of the primary equipment module and the microgrid module, and generates tie line power control signals and microgrid operation mode control signals after processing, which are fed back to the secondary control module.

The above simulation data includes the voltage signal and current signal of the primary equipment module.

The real-time monitoring data of the above-mentioned micro-grid module includes micro-grid voltage, micro-grid frequency, and tie-line power.

The real-time monitoring data of the above-mentioned RT-LAB simulator includes the frequency of the microgrid, the voltage of the microgrid, the power of the tie line of the microgrid, and the power of each primary equipment module.

As shown in Figure 2, the present invention includes RT-LAB emulator, primary control module, secondary control module and computer, RT-LAB emulator comprises microgrid module and each primary equipment module under microgrid module, microgrid The modules are connected to each primary equipment module, each primary equipment module is connected to its corresponding primary control module, all primary control modules are connected to a secondary control module, and the secondary control module is connected to a computer. Among them, the first-level control module, the second-level control module, and the computers are all connected to each other through switches to form an Ethernet network.

The present invention utilizes the idea of modular design and mathematical modeling of the micro-grid, applies the RT-LAB simulator to the micro-grid simulation system of the electric power system, can perform data analysis and display in a timely and accurate manner, and performs half-digital and half-physical real-time simulation. It is helpful for further microgrid debugging and testing.

The Ethernet network of the present invention performs data transmission through the UDP transmission protocol. The RT-LAB simulator of the present invention exchanges data with the DSP processors of the primary control module and the secondary control module through their respective external interfaces (including A/D, D/A, and digital I/O), and transmits data through Ethernet UDP Data transmission and communication with the computer.

Each primary equipment module includes a fan module, a diesel engine module, an energy storage module and a photovoltaic module.

Both the first-level control module and the second-level control module use DSP processors, preferably TMS320F28335 processors from Ti Company.

As shown in Figure 3, the primary control module is provided with an A/D interface, an SPI interface and an I/O interface.

As shown in Figure 4, the secondary control module is provided with an A/D interface and an I/O interface.

The RT-LAB simulator and the DSP processor exchange data through their respective external interfaces (including A/D, D/A, digital I/O ports, etc.), and perform data transmission and communication with the computer through Ethernet.

With software assistance, the system can intuitively output the operating data of the microgrid module in various situations such as voltage, current, and power with waveforms, and analyze, compare, save and call the data and waveforms. Finally, through the displayed waveform, optimize and adjust the operating parameters of the microgrid model on the host computer (computer) to achieve the best control effect and provide a basis for physical experiments and practical applications.

RT-LAB is widely used in power system microgrid simulation platform, and timely and accurate data analysis and display is the basis for subsequent analysis and processing. Digital-analog hybrid simulation plays an important role in scientific research such as microgrid debugging and algorithm testing. RT-LAB can simulate the primary equipment, and the secondary control equipment needs to be customized and developed according to the characteristics of the equipment to achieve the purpose of hybrid simulation. Due to the different products, the secondary control equipment lacks a relatively common platform, resulting in the repeated development of many scientific research secondary boards, and there is no general simulation platform on the market.

For the general platform of RT-LAB's secondary controller equipment, according to the needs of the power system microgrid, it not only needs to meet the requirements of different parameter measurement analysis and control, but also needs to accurately display the relevant parameters of the microgrid model, and obtain the corresponding waveform. And has a preliminary analysis function.

The present invention uses the RT-LAB simulator to simulate the operation of the micro-grid in real time, operates the micro-grid through the primary control module and the secondary control module to perform primary and secondary control, and also performs tertiary control on the secondary control module through the computer. Furthermore, the formation of a real-time simulation platform of half-digital and half-physical microgrids will bring great convenience to the research of microgrids, greatly reduce the cost of scientific research on the actual operation of microgrids, and greatly promote the theoretical research of power systems.

The microgrid module constructed in the RT-LAB emulator of the present invention includes the following parts:

①Distributed power generation unit. Such as wind turbines, photovoltaics, energy storage, diesel engines, etc.;

② load. Such as RLC load, motor load, power electronic load, etc.;

③ Power network. The distributed generation units, loads and main grid are connected by lines.

The RT-LAB real-time simulation system is used to establish the real-time simulation models of the above three microgrid components (that is, the microgrid module and each primary equipment module under the microgrid module), and perform corresponding control. This module adopts a hierarchical control method, which can decouple the control of the microgrid at different time scales and improve the controllability and reliability of the microgrid. The microgrid control of this system is mainly divided into three levels: primary control, secondary control and tertiary control.

Primary control, also known as local control, is a control layer used to control local parameters such as frequency, voltage, and injection current. In each distributed power converter connected to the microgrid, in addition to the basic double closed-loop control method of voltage loop and current loop, droop control technology with virtual impedance is also used in the primary control.

Secondary control is a centralized controller that compensates for steady-state errors in voltage and frequency, bringing their values back to their nominal values. In addition, the secondary controller is also responsible for the control of the voltage along the AC bus, so that the voltage at any point in the microgrid structure is within the operating limits.

The function of the three-level control is to optimize the operation of the microgrid, control the power of the tie line in the grid-connected state, and reasonably distribute the load to each power source in the isolated grid state to achieve the optimal effect.

The specific implementation work process of each stage of the present invention is as follows:

(1) As shown in Figure 1: the system includes: RT-LAB simulator, primary control module, secondary control module and computer,

A) The RT-LAB simulator simulates the operation of the microgrid, and outputs the parameters of each part of the microgrid, such as primary equipment and tie lines, through the I/O port; the primary equipment includes components such as fans, photovoltaics, diesel engines, and energy storage.

B) The analog output unit of the primary device of the RT-LAB simulator is connected to the A/D conversion unit of the corresponding primary control module through a cable.

The corresponding first-level control module runs the first-level control method of the microgrid, controls the D/A module to output analog quantities to the analog I/O of the RT-LAB simulator through the SPI interface, and outputs ePWM waves to the RT-LAB simulator Digital I/O to control primary device operation of RT-LAB simulator.

C) The secondary control method of operating the microgrid in the secondary control module sends the microgrid tie line circuit breaker opening and closing control signal to the RT-LAB simulator through the digital I/O interface. The secondary control module is connected with each primary control module through Ethernet at the same time for two-way communication. Each primary control module transmits data to the secondary control module, and the secondary control module processes the data and sends a control signal to the primary control module for secondary control.

D) The secondary control module is connected to the computer via Ethernet for two-way communication. On the one hand, the secondary control module sends data to the computer, and the corresponding waveform is displayed on the computer; on the other hand, the computer sends data to the secondary control module to change its relevant parameters to form a tertiary control.

E) The Ethernet connections of the above-mentioned parts are constructed by switches.

(2) As shown in Attachment 2:

The analog quantity in the RT-LAB simulator is connected to the A/D unit of the first-level control module through the analog I/O; the first-level control module receives the feedback signal from the RT-LAB simulator, and sends it after closed-loop calculation. Control the control signal to the RT-Lab simulator. The control signal is sent by the first-level control module to the D/A module through the SPI unit, so that the D/A module sends the analog quantity to the analog I/O interface of the RT-LAB simulator, thereby controlling the distributed power generation in the RT-LAB The machine can change the operating status of the primary equipment of the microgrid.

(3) As shown in Figure 3:

The analog quantity in the RT-LAB simulator is connected to the A/D unit of the secondary control module by a cable through the analog I/O interface; the secondary control module receives the signal from the RT-LAB simulator, and after closed-loop calculation, The digital I/O interface sends the opening and closing control signal of the tie line circuit breaker of the microgrid to the RT-Lab simulator.

(4) As shown in Figure 4:

The first-level control module, the second-level control module, and the computer use the switch as the medium to form an Ethernet network for mutual connection and data transmission. Among them, the first-level control module and the second-level control module communicate in two directions to form a second-level control process; the second-level control module and the computer communicate in two-way to complete the third-level control process.

The above specific embodiments are used to explain the present invention, rather than to limit the present invention. Within the spirit of the present invention and the protection scope of the claims, any modification and change made to the present invention will fall into the protection scope of the present invention.

Claims (9)

1. A microgrid half-digital half-physical real-time simulation system based on RT-LAB, characterized in that: Including RT-LAB simulator, RT-LAB simulator includes microgrid module and each primary equipment module under the microgrid module; Including the first-level control module connected with each primary equipment module in the RT-LAB simulator, the first-level control module receives the simulation data of the primary equipment module for processing and conversion, outputs active power and reactive power to the second-level control module, and receives the second-level control module The feedback PWM control signal of the stage control module is sent to the primary equipment module; Including the secondary control module connected to all the primary control modules, the secondary control module receives the active power and reactive power output by the primary control module, and at the same time receives the real-time monitoring data of the microgrid module, and outputs it to the RT-LAB simulator after processing The real-time monitoring data to the computer; and receive the tie line power control signal and the micro grid operation mode control signal output by the computer; and output the tie line circuit breaker opening and closing control signal to the micro grid module of the RT-LAB simulator; It includes a computer connected to the secondary control module. The computer receives the detection data of the primary equipment module and the microgrid module, and generates tie line power control signals and microgrid operation mode control signals after processing, which are fed back to the secondary control module. 2. A kind of RT-LAB-based microgrid half-digital half-physical real-time simulation system according to claim 1, characterized in that: said primary control module, secondary control module, and computers interact with each other through switches connected to form an Ethernet network. 3. A kind of RT-LAB-based microgrid half-digital half-physical real-time simulation system according to claim 2, characterized in that: said Ethernet network carries out data transmission through UDP transmission protocol. 4. A kind of RT-LAB-based microgrid half-digital half-physical real-time simulation system according to claim 1, characterized in that: said simulation data includes voltage signals and current signals. 5. A kind of RT-LAB-based micro-grid half-digital half-physical real-time simulation system according to claim 1, characterized in that: the real-time monitoring data of the micro-grid module includes micro-grid voltage, micro-grid frequency, contact line power. 6. A kind of RT-LAB-based micro-grid half-digital half-physical real-time simulation system according to claim 1, characterized in that: the real-time monitoring data of the RT-LAB emulator includes micro-grid frequency, micro-grid voltage , the power of the tie line of the microgrid and the power of each primary equipment module. 7. A kind of RT-LAB-based microgrid half-digital half-physical real-time simulation system according to claim 1, characterized in that: the first-level control module and the second-level control module all adopt DSP. 8. A kind of RT-LAB-based micro-grid half-digital half-physical real-time simulation system according to claim 1, characterized in that: the first-level control module is provided with A/D interface, SPI interface and I/O interface. 9. A kind of RT-LAB-based microgrid half-digital half-physical real-time simulation system according to claim 1, characterized in that: said secondary control module is provided with an A/D interface and an I/O interface.