阅读说明：本技术 一种非线性负荷仿真装置 (Nonlinear load simulation device ) 是由 刘海涛 牛健 赫嘉楠 黄鸣宇 尹亮 祁升龙 李四勤 张爽 芦翔 王放 栗磊 梁 于 2019-08-08 设计创作，主要内容包括：本发明公开了一种非线性负荷仿真装置,包括：控制单元和非线性负载仿真单元；所述控制单元通过第一接口与所述非线性负载仿真单元连接；所述非线性负载仿真单元包括：电压单元、非线性电阻单元和电流单元；所述电压单元与所述非线性电阻单元电连接；所述电流单元与所述非线性电阻单元。本发明提供的非线性负荷仿真装置可模拟各种非线性谐波负荷、冲击性负荷、恶性负荷；它的负荷曲线与电力工况可以根据试验需求预先编程设定,可根据预先设置运行时间自动加载。(The invention discloses a nonlinear load simulation device, which comprises: the device comprises a control unit and a nonlinear load simulation unit; the control unit is connected with the nonlinear load simulation unit through a first interface; the nonlinear load simulation unit includes: the device comprises a voltage unit, a nonlinear resistance unit and a current unit; the voltage unit is electrically connected with the nonlinear resistance unit; the current unit and the nonlinear resistance unit. The nonlinear load simulation device provided by the invention can simulate various nonlinear harmonic loads, impact loads and malignant loads; the load curve and the power working condition of the device can be preset by programming according to test requirements, and can be automatically loaded according to preset running time.)

1. A nonlinear load simulation apparatus, comprising: the device comprises a control unit and a nonlinear load simulation unit; the control unit is connected with the nonlinear load simulation unit through a first interface;

the nonlinear load simulation unit includes: the device comprises a voltage unit, a nonlinear resistance unit and a current unit; the voltage unit is electrically connected with the nonlinear resistance unit; the current unit and the nonlinear resistance unit.

2. The nonlinear load simulation apparatus of claim 1, wherein the voltage unit comprises a three-level module; the three-level module is electrically connected with the nonlinear resistance unit.

3. The nonlinear load simulation apparatus of claim 2, wherein the nonlinear load comprises a bi-directional inverter comprising bipolar transistors; the bidirectional current transformer is electrically connected with the nonlinear resistance unit.

4. The nonlinear load simulation apparatus of claim 1, wherein the control unit comprises a digital signal processing unit; the digital signal processing unit is connected with the nonlinear load simulation unit through the first interface.

5. The nonlinear load simulation apparatus according to claim 1, wherein the nonlinear load simulation unit is provided with a plurality of second interfaces for standby.

Technical Field

The invention relates to simulation, in particular to a nonlinear load simulation device.

Background

With the development of the steel industry in China, steel-making enterprises start to adopt high-power intermediate frequency furnaces for steel making in succession. Although the pollution of the steel industry is reduced and the energy consumption is saved, due to the nonlinearity of the intermediate frequency power supply rectification and inversion equipment, a large amount of harmonic pollution is brought to a power grid, and the safe operation of the power grid and electric equipment is influenced. If the damage of a power distribution network line is obviously increased, substation equipment and the like are burnt, relay protection equipment frequently acts and the like.

With the rapid application and development of electric arc furnaces in the metallurgical industry, the quality of electric energy caused by the electric arc furnaces also becomes more and more serious. Because the modern large-scale ultrahigh-power steelmaking electric arc furnace has the characteristics of large capacity, low power factor, large reactive load fluctuation and rapid change, severe unbalance of three-phase load and the like, the electric arc furnace brings a large amount of harmonic pollution to the electric energy quality of a power grid.

The rolling mill motor is mainly powered by silicon controlled rectifier current transformation, the load capacity is large, the change of the rolling mill motor has certain periodicity, the change speed is high, and the change amplitude is large. The silicon controlled rectifier circuit can be used as a direct current power supply of the direct current motor and can also be used for adjusting the armature voltage of the direct current motor to regulate the speed. Due to the nonlinearity of the rectifying circuit, the silicon controlled rectifier circuit can bring harmonic pollution to a power grid while realizing stepless speed regulation.

Therefore, the harmonic characteristics of the power grid are analyzed, reasonable detection and treatment are made, and the power quality is improved, so that the method has important significance.

Disclosure of Invention

In view of this, the present invention is to provide a nonlinear load simulation apparatus, which can simulate and simulate harmonic conditions under different loads, voltages, powers, etc., and is significant for preventing and treating harmonic pollution.

In view of the above object, the present invention provides a nonlinear load simulation apparatus, including: the device comprises a control unit and a nonlinear load simulation unit; the control unit is connected with the nonlinear load simulation unit through a first interface;

the nonlinear load simulation unit includes: the device comprises a voltage unit, a nonlinear resistance unit and a current unit; the voltage unit is electrically connected with the nonlinear resistance unit; the current unit and the nonlinear resistance unit.

As a more specific embodiment, the voltage unit includes a three-level module; the three-level module is electrically connected with the nonlinear resistance unit.

As a more specific embodiment, the nonlinear load includes a bi-directional inverter composed of bipolar transistors; the bidirectional current transformer is electrically connected with the nonlinear resistance unit.

As a more specific embodiment, the control unit includes a digital signal processing unit; the digital signal processing unit is connected with the nonlinear load simulation unit through the first interface.

As a more specific embodiment, the nonlinear load simulation unit is provided with a plurality of spare second interfaces.

From the above, the nonlinear load simulation device provided by the invention can simulate various nonlinear harmonic loads, impact loads and malignant loads; the load curve and the power working condition of the device can be preset by programming according to test requirements, and can be automatically loaded according to preset running time. The device is simple and flexible to operate, and is widely applied to electrical laboratory test systems and various power electronic product research and development test platforms.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a nonlinear load simulation apparatus according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.

The invention provides a nonlinear load simulation device, comprising: the device comprises a control unit and a nonlinear load simulation unit; the control unit is connected with the nonlinear load simulation unit through a first interface;

the nonlinear load simulation device can simulate various nonlinear harmonic loads, impact loads, malignant loads and the like, and the load curve and the power working condition of the nonlinear load simulation device can be programmed and set in advance according to test requirements and can be automatically loaded according to the preset running time.

The control unit is used for processing signal acquisition, transformation, filtering, estimation, enhancement, compression, identification and the like so as to obtain a signal form meeting the needs of people.

The nonlinear load simulation unit is equal to a high-performance power harmonic generator, the amplitude and phase parameters of each harmonic can be respectively and independently preset, and the nonlinear load simulation unit automatically operates according to set time.

The field real-time data collected by the wave recorder can be guided into the control unit after being processed according to the equipment indexes under the condition that the equipment permission range is required to be met, and the electric power working condition of the fault field can be reproduced in a laboratory. The nonlinear load simulation unit can satisfy the following simulation:

(1) can simulate typical nonlinear loads of electrified railways, steel plants, port terminals, electrolytic aluminum plants and the like.

(2) The simulation system can simulate new energy power generation such as photovoltaic and wind power and novel nonlinear loads such as electric vehicles and energy-saving products.

(3) The system can simulate the instant impact of starting of a motor, an air conditioner, a refrigerator and an elevator so as to test the stability of a power supply system.

(4) The load curve can be pre-programmed and set through software of the control unit.

(5) The operation mode, the load power and the operation time can be automatically executed after being set;

the nonlinear load simulation unit includes: the device comprises a voltage unit, a nonlinear resistance unit and a current unit; the voltage unit is electrically connected with the nonlinear resistance unit; the current unit and the nonlinear resistance unit.

The nonlinear resistance unit is used for simulating a three-phase load or a single-phase load. The voltage unit, the nonlinear resistance unit and the current unit are matched to meet the requirement

(1) The voltage, current and power of the load fundamental wave and harmonic wave can be configured independently.

(2) The fundamental wave and harmonic voltage, current and power can be respectively set with parameters such as amplitude, phase, power factor and the like.

(3) The amplitude and phase parameters of each harmonic wave can be set respectively, and are independent and not influenced mutually.

(4) The amplitude of the impact load is continuously adjustable.

(5) The simulation system can realize one-time simulation of various running states, and the duration, voltage, current and power parameters of various states can be independently set.

Therefore, the nonlinear load simulation device provided by the invention can simulate various nonlinear harmonic loads, impact loads and malignant loads; the load curve and the power working condition of the device can be preset by programming according to test requirements, and can be automatically loaded according to preset running time. The device is simple and flexible to operate, and is widely applied to electrical laboratory test systems and various power electronic product research and development test platforms.

As a more specific embodiment, referring to fig. 1, the nonlinear load simulation unit includes: the device comprises a voltage unit, a nonlinear resistance unit and a current unit; the nonlinear load simulation unit is connected with the control unit. The voltage unit comprises a three-level module; the three-level module is electrically connected with the nonlinear resistance unit.

The nonlinear load comprises a bidirectional current transformer consisting of bipolar transistors; the bidirectional current transformer is electrically connected with the nonlinear resistance unit.

The control unit comprises a digital signal processing unit; the digital signal processing unit is connected with the nonlinear load simulation unit through the first interface.

The nonlinear load simulation unit is provided with a plurality of standby second interfaces. The second interface can be used for widening the load power range by using the expansion port, and can also conveniently configure a novel actual electric load to the nonlinear analog device.

The second interface can be a software and hardware upgrading expansion port so as to upgrade and configure the device at a later date. When the load simulated by the simulation device can not meet the requirement, the device can be upgraded and configured, a new simulation module is accessed into the existing device, and the unified control management of the upgrade module is realized by utilizing the existing control port, communication port and control software.

The second interface and the second interface CAN be RS485, CAN2.0 or LAN interface.

The apparatus of the foregoing embodiment is used to implement the corresponding method in the foregoing embodiment, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.

While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.

The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.