CN213875844U - Auxiliary system for measuring low-frequency output impedance of distributed power supply in microgrid - Google Patents
Auxiliary system for measuring low-frequency output impedance of distributed power supply in microgrid Download PDFInfo
- Publication number
- CN213875844U CN213875844U CN202021125333.4U CN202021125333U CN213875844U CN 213875844 U CN213875844 U CN 213875844U CN 202021125333 U CN202021125333 U CN 202021125333U CN 213875844 U CN213875844 U CN 213875844U
- Authority
- CN
- China
- Prior art keywords
- power supply
- impedance measurement
- interference signal
- signal
- impedance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model discloses a be used for distributed power source low frequency output impedance measurement's auxiliary system in microgrid, the system includes: the system comprises an impedance measurement center control system, an impedance measurement communication system and an impedance measurement interference signal generation system; the impedance measurement communication system comprises a high-speed signal synchronization system and a low-speed data transmission system; the impedance measurement interference signal generation system controls each distributed power supply to generate an interference signal according to an instruction of the impedance measurement center control system, and a system response signal is generated through the interference signal; the high-speed signal synchronization system is used for clock synchronization generated by the interference signal, and the low-speed data transmission system is used for transmitting the system response signal to the impedance measurement center control system; calculating, by the impedance measurement center control system, an output impedance of each distributed power source based on the interference signal and the system response signal.
Description
Technical Field
The utility model relates to an electric power system control technical field, more specifically relates to an auxiliary system that is used for distributed power source low frequency output impedance measurement in microgrid.
Background
With the gradual maturity of new energy power generation technology, distributed power generation systems are widely installed and used at present, and by integrating various distributed new energy power generation equipment such as photovoltaic and wind power and energy storage equipment in a system form and coordinately controlling various distributed power sources and energy storage equipment in the system in a microgrid form, the influence of the new energy intermittence on the system can be effectively reduced, so that the occupation ratio of new energy power generation in the system is improved. Along with the gradual increase of the occupation ratio of new energy power generation in the microgrid, the stability problem of the microgrid is also solved. The impedance of each power supply in the microgrid can be accurately measured, and reference can be provided for the stable state of the microgrid.
The output impedance of the power supply in each microgrid can be measured by injecting harmonic waves into the power supply in each microgrid and observing the response of the power supply to the corresponding harmonic waves. Conventionally, it is often necessary to provide external harmonic generation equipment for each power supply to measure its output impedance, which not only increases the cost of the system, but also makes the operation of the system complicated.
Therefore, it is necessary to establish an impedance measurement auxiliary system to implement low-frequency output impedance measurement of the distributed power supplies in the microgrid.
Disclosure of Invention
The technical scheme of the invention provides an auxiliary system for measuring the low-frequency output impedance of a distributed power supply in a microgrid, and the auxiliary system is used for solving the problem of measuring the low-frequency output impedance of the distributed power supply in the microgrid.
In order to solve the above problem, the present invention provides an auxiliary system for low frequency output impedance measurement of distributed power supplies in a microgrid, the system comprising: the system comprises an impedance measurement center control system, an impedance measurement communication system and an impedance measurement interference signal generation system; the impedance measurement communication system comprises a high-speed signal synchronization system and a low-speed data transmission system;
the impedance measurement interference signal generation system controls each distributed power supply to generate an interference signal according to an instruction of the impedance measurement center control system, and a system response signal is generated through the interference signal; the high-speed signal synchronization system is used for clock synchronization generated by the interference signal, and the low-speed data transmission system is used for transmitting the system response signal to the impedance measurement center control system;
calculating, by the impedance measurement center control system, an output impedance of each distributed power source based on the interference signal and the system response signal.
Preferably, the distributed power supply includes a voltage control type power supply and a current control type power supply;
the voltage control type power supply comprises an uninterruptible power supply and a battery energy storage power supply; the current control type power supply comprises a photovoltaic grid-connected power generation inverter.
Preferably, the method comprises the following steps:
when impedance measurement is carried out on each voltage control type power supply, interference signals generated by each current control type power supply are controlled, and the high-speed signal synchronization system is used for clock synchronization generated by the interference signals; the interference signal is input to each voltage control type power supply, and a system response signal is generated through each voltage control type power supply;
respectively collecting output voltage signals and output current signals of each voltage control type power supply, and transmitting the voltage signals and the current signals to the impedance measurement center control system through the low-speed data transmission system;
the impedance measurement center control system calculates the output impedance of each voltage control type power supply based on the voltage signal and the current signal.
Preferably, the method further comprises the following steps:
when impedance measurement is carried out on each current control type power supply, interference signals generated by each voltage control type power supply are controlled, and the high-speed signal synchronization system is used for clock synchronization generated by the interference signals; the interference signal is input to each current control type power supply, and a system response signal is generated through each current control type power supply;
respectively collecting output voltage signals and output current signals of each current control type power supply, and transmitting the voltage signals and the current signals to the impedance measurement center control system through the low-speed data transmission system;
the impedance measurement center control system calculates the output impedance of each current control type power supply based on the voltage signal and the current signal.
Preferably, the method further comprises the following steps: the impedance measurement center control system calculates a voltage frequency domain component of the voltage signal and a current frequency domain component of the current signal through an FFT algorithm, and calculates an output impedance of each voltage control type power supply or an output impedance of each current control type power supply based on the voltage frequency domain component and the current frequency domain component.
The technical scheme of the invention provides an auxiliary system for measuring low-frequency output impedance of a distributed power supply in a microgrid, which comprises the following components: the system comprises an impedance measurement center control system, an impedance measurement communication system and an impedance measurement interference signal generation system; the impedance measurement communication system comprises a high-speed signal synchronization system and a low-speed data transmission system; the impedance measurement interference signal generation system controls each distributed power supply to generate an interference signal according to an instruction of the impedance measurement center control system, and a system response signal is generated through the interference signal; the system comprises a high-speed signal synchronization system, a low-speed data transmission system and an impedance measurement center control system, wherein the high-speed signal synchronization system is used for clock synchronization generated by interference signals, and the low-speed data transmission system is used for transmitting system response signals to the impedance measurement center control system; and calculating the output impedance of each distributed power supply by the impedance measurement center control system based on the interference signal and the system response signal. By installing the auxiliary system provided by the technical scheme of the invention in the microgrid, each power supply in the microgrid is coordinated in real time to generate harmonic interference signals, and the harmonic response signals are measured by the aid of the sensors of each power supply, so that the output impedance of each power supply in the microgrid under the rated working condition can be effectively measured in real time.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a block diagram of an auxiliary system for low frequency output impedance measurement of distributed power supplies within a microgrid according to a preferred embodiment of the present invention;
FIG. 2 is a graph of the impedance magnitude of a voltage controlled power supply according to a preferred embodiment of the present invention; and
fig. 3 is a graph of impedance magnitude of a current controlled power supply according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a diagram of an auxiliary system for low frequency output impedance measurement of distributed power supplies in a microgrid according to a preferred embodiment of the present invention. The invention provides an auxiliary system for measuring low-frequency output impedance of a distributed power supply in a microgrid, which comprises: the system comprises an impedance measurement center control system, an impedance measurement communication system (comprising a high-speed signal synchronization system and a low-speed data transmission system) and an impedance measurement interference signal generation system arranged on a power supply in a microgrid. The distributed power supply impedance measuring system can coordinate and control distributed power supplies in a microgrid to generate interference signals for measurement, collect system response signals generated by interference signal disturbance, and finally calculate the output impedance of each power supply through the interference signals and the response signals.
As shown in fig. 1, an assistance system for distributed power supply low frequency output impedance measurement in a microgrid, the system comprising: the system comprises an impedance measurement center control system, an impedance measurement communication system and an impedance measurement interference signal generation system; the impedance measurement communication system comprises a high-speed signal synchronization system and a low-speed data transmission system;
the impedance measurement interference signal generation system controls each distributed power supply to generate an interference signal according to an instruction of the impedance measurement center control system, and a system response signal is generated through the interference signal; the high-speed signal synchronization system is used for clock synchronization of interference signal generation, and the low-speed data transmission system is used for transmitting a system response signal to the impedance measurement center control system.
The impedance measurement center controller is used for coordinating and controlling each distributed power supply in a microgrid to generate interference signals for measurement, collecting system response signals generated by interference signal disturbance, and finally calculating the output impedance of each power supply according to the interference signals and the response signals. The impedance measurement communication system comprises a high-speed signal synchronization system and a low-speed data transmission system, wherein the high-speed signal synchronization system is used for clock synchronization generated by interference signals, and the low-speed data transmission system is used for transmitting response signals acquired by uploading of all distributed power supplies. And the impedance measurement interference signal generation system is used for controlling each distributed power supply to generate synchronous interference signals according to instructions of the central control system. And calculating the output impedance of each distributed power supply by the impedance measurement center control system based on the interference signal and the system response signal. And each distributed power supply can be controlled to generate synchronous interference signals according to instructions of the impedance measurement center control system.
Preferably, the distributed power supply includes a voltage control type power supply and a current control type power supply; the voltage control type power supply comprises an uninterruptible power supply and a battery energy storage power supply; the current control type power supply comprises a photovoltaic grid-connected power generation inverter. The distributed power supplies in the microgrid of the present invention are classified into voltage control type power supplies such as uninterruptible power supplies and battery storage power supplies, and current control type power supplies such as photovoltaic grid-connected power generation inverters and the like.
Preferably, when the impedance measurement is performed on each voltage control type power supply, the interference signal is generated by controlling each current control type power supply, and the clock synchronization for the generation of the interference signal is performed by a high-speed signal synchronization system; the interference signal is input to each voltage control type power supply, and a system response signal is generated through each voltage control type power supply; respectively collecting output voltage signals and output current signals of each voltage control type power supply, and transmitting the voltage signals and the current signals to an impedance measurement center control system through a low-speed data transmission system; the impedance measurement center control system calculates the output impedance of each voltage control type power supply based on the voltage signal and the current signal.
When the impedance of the voltage control type power supply is measured, the working principle of the central controller is that the harmonic current interference signal is generated by controlling the impedance measurement interference signal generation system of each current control type power supply, the harmonic current interference signal synchronization of each current control type power supply is completed through the impedance measurement communication system, the harmonic current signal finally flows through each voltage control type power supply and generates a corresponding harmonic voltage signal, then each voltage control type power supply respectively acquires the output voltage signal and the output current signal, the output voltage signal and the output current signal are uploaded to the central controller through the low-speed communication system in the communication system, and the output impedance of each voltage control type power supply is calculated by the central controller.
Preferably, the method further comprises the following steps: when impedance measurement is carried out on each current control type power supply, interference signals generated by each voltage control type power supply are controlled, and a high-speed signal synchronization system is used for clock synchronization generated by the interference signals; the interference signal is input to each current control type power supply, and a system response signal is generated through each current control type power supply; respectively collecting output voltage signals and output current signals of each current control type power supply, and transmitting the voltage signals and the current signals to an impedance measurement center control system through a low-speed data transmission system; the impedance measurement center control system calculates the output impedance of each current control type power supply based on the voltage signal and the current signal.
When the impedance of the current control type power supply is measured, the working principle of the central controller is that the harmonic voltage interference signal is generated by controlling the impedance measurement interference signal generation system of the voltage control type power supply, the harmonic voltage interference signal synchronization of each voltage control type power supply is completed by the impedance measurement communication system, the harmonic voltage interference signal acts on each current control type power supply and generates a corresponding harmonic current signal, then each current control type power supply respectively acquires the output voltage signal and the output current signal, the output voltage signal and the output current signal are uploaded to the central controller by the communication system, and the output impedance of each current control type power supply is calculated by the central controller.
Preferably, the method further comprises the following steps: the impedance measurement center control system calculates a voltage frequency domain component of the voltage signal and a current frequency domain component of the current signal through an FFT algorithm, and calculates the output impedance of each voltage control type power supply or the output impedance of each current control type power supply based on the voltage frequency domain component and the current frequency domain component.
The output impedance calculation method operated in the central controller of the invention is to calculate and obtain the frequency domain component of each voltage signal and current signal through FFT algorithm, divide and get the output impedance of each voltage control type power finally by the frequency domain component of the voltage signal and the frequency domain component of the current signal. The impedance measurement auxiliary system can effectively measure the output impedance of the rated working state of each distributed power supply in real time, an external signal interference device is not needed, the running cost of the system can be reduced, the measured output impedance of each distributed power supply can be used for stability assessment and prediction of the micro-grid system, and reference and assistance are provided for establishing an undetermined and reliable novel power system in the future.
The following exemplifies embodiments of the present invention. The invention takes the impedance measurement auxiliary system shown in fig. 1 as an example, and comprises an impedance measurement auxiliary system, an impedance measurement communication system and an impedance measurement interference signal generation system arranged on a power supply in a microgrid.
The impedance measurement center controller is used for coordinating and controlling each distributed power supply in the microgrid to generate an interference signal for measurement, collecting a system response signal generated by interference signal disturbance, and finally calculating the output impedance of each power supply according to the interference signal and the response signal. The impedance measurement communication system comprises a high-speed signal synchronization system and a low-speed data transmission system, wherein the high-speed signal synchronization system is used for clock synchronization generated by interference signals, and the low-speed data transmission system is used for transmitting response signals acquired by uploading of all distributed power supplies. And the impedance measurement interference signal generation system is used for controlling each distributed power supply to generate synchronous interference signals according to instructions of the central control system.
Distributed power sources in a microgrid are classified into voltage control type power sources such as uninterruptible power supplies and battery storage power sources, and current control type power sources such as photovoltaic grid-connected power generation inverters and the like. When the impedance of the voltage control type power supply is measured, the specific test steps are as follows:
step 1, controlling an impedance measurement interference signal generation system of each current control type power supply to generate a harmonic current interference signal, and completing the harmonic current interference signal synchronization of each current control type power supply through an impedance measurement communication system.
And 2, respectively acquiring respective output voltage signals and output current signals by each voltage control type power supply, and uploading the output voltage signals and the output current signals to a central controller by a low-speed communication system in the communication system.
And 3, operating an FFT algorithm in the central controller to calculate frequency domain components of the voltage signals and the current signals, and finally dividing the frequency domain components of the voltage signals and the frequency domain components of the current signals to obtain the output impedance of each voltage control type power supply.
When measuring the impedance of the current control type power supply, the specific test steps are as follows:
step 1, controlling an impedance measurement interference signal generation system of each voltage control type power supply to generate a harmonic voltage interference signal, and completing the harmonic current interference signal synchronization of each voltage control type power supply through an impedance measurement communication system.
And 2, respectively acquiring respective output voltage signals and output current signals by each current control type power supply, and uploading the output voltage signals and the output current signals to a central controller by a low-speed communication system in the communication system.
And 3, operating an FFT algorithm in the central controller to calculate frequency domain components of the voltage signals and the current signals, and finally dividing the frequency domain components of the voltage signals and the frequency domain components of the current signals to obtain the output impedance of each current control type power supply.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (2)
1. An auxiliary system for measuring low frequency output impedance of a distributed power supply in a microgrid, the auxiliary system comprising: the system comprises an impedance measurement center control system, an impedance measurement communication system and an impedance measurement interference signal generation system; the impedance measurement communication system comprises a high-speed signal synchronization system and a low-speed data transmission system;
the impedance measurement interference signal generation system controls each distributed power supply to generate an interference signal according to an instruction of the impedance measurement center control system, and a system response signal is generated through the interference signal; the high-speed signal synchronization system is used for clock synchronization generated by the interference signal, and the low-speed data transmission system is used for transmitting the system response signal to the impedance measurement center control system;
calculating, by the impedance measurement center control system, an output impedance of each distributed power source based on the interference signal and the system response signal.
2. The auxiliary system of claim 1, wherein the distributed power supply comprises a voltage-controlled power supply and a current-controlled power supply;
the voltage control type power supply comprises an uninterruptible power supply and a battery energy storage power supply; the current control type power supply comprises a photovoltaic grid-connected power generation inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021125333.4U CN213875844U (en) | 2020-06-17 | 2020-06-17 | Auxiliary system for measuring low-frequency output impedance of distributed power supply in microgrid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021125333.4U CN213875844U (en) | 2020-06-17 | 2020-06-17 | Auxiliary system for measuring low-frequency output impedance of distributed power supply in microgrid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213875844U true CN213875844U (en) | 2021-08-03 |
Family
ID=77032698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021125333.4U Active CN213875844U (en) | 2020-06-17 | 2020-06-17 | Auxiliary system for measuring low-frequency output impedance of distributed power supply in microgrid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213875844U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116106629A (en) * | 2023-04-06 | 2023-05-12 | 上海安其威微电子科技有限公司 | Frequency response testing method for power supply impedance |
-
2020
- 2020-06-17 CN CN202021125333.4U patent/CN213875844U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116106629A (en) * | 2023-04-06 | 2023-05-12 | 上海安其威微电子科技有限公司 | Frequency response testing method for power supply impedance |
| CN116106629B (en) * | 2023-04-06 | 2023-07-28 | 上海安其威微电子科技有限公司 | Frequency response testing method for power supply impedance |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11289910B2 (en) | Method and apparatus for impedance matching in virtual impedance droop controlled power conditioning units | |
| US8498832B2 (en) | Method and device for assessing and monitoring voltage security in a power system | |
| KR101400009B1 (en) | Training apparatus for a smart grid education | |
| EP3400451B1 (en) | Apparatus for and method of providing measurements of uncertainty in respect of a transfer function | |
| JP2006524332A (en) | Emergency power supply system deterioration diagnosis system | |
| EP3360225B1 (en) | Solar power conversion system and method | |
| US20160006248A1 (en) | Power flow control system and power flow control method | |
| US11515706B2 (en) | Battery energy storage system and microgrid controller | |
| JP2019190939A (en) | Storage battery condition monitoring system | |
| CN103645384A (en) | Grounding resistor test power frequency interference inhibition apparatus | |
| CN213875844U (en) | Auxiliary system for measuring low-frequency output impedance of distributed power supply in microgrid | |
| Pigazo et al. | Wavelet-based islanding detection algorithm for single-phase photovoltaic (PV) distributed generation systems | |
| KR20100037317A (en) | Multiple facts control system and method therefor | |
| CN103647284B (en) | A kind of voltage stabilization Forecasting Methodology of discontinuity surface problem when solving list | |
| KR101811661B1 (en) | Apparatus and method for testing power converter of new renewable energy | |
| CN102082464A (en) | Electric energy quality signal generating system for smart grid as well as comprehensive test method | |
| CN202651788U (en) | Nonlinear load harmonic risk assessment system | |
| KR101197040B1 (en) | Weather-Load Simulator | |
| Nakmali et al. | A new hybrid approach to thevenin equivalent estimation for voltage stability monitoring | |
| CN105958510B (en) | SOC chip for power grid monitoring and control equipment | |
| CN110649651B (en) | Alternating current-direct current bidirectional converter, adaptive method thereof and electronic device | |
| Chappa et al. | A novel load shedding methodology to mitigate voltage instability in power system | |
| Haines et al. | Microgrid system and component evaluation: Mobile test platform with battery storage | |
| CN108270247B (en) | Parameter error compensation method and equipment for wind turbine generator | |
| CN104934999A (en) | Photovoltaic power generation control method and apparatus and photovoltaic power generation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |