CN112345878A - Ship power supply system electric energy quality on-line monitoring and evaluation device - Google Patents
Ship power supply system electric energy quality on-line monitoring and evaluation device Download PDFInfo
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- CN112345878A CN112345878A CN202010972509.8A CN202010972509A CN112345878A CN 112345878 A CN112345878 A CN 112345878A CN 202010972509 A CN202010972509 A CN 202010972509A CN 112345878 A CN112345878 A CN 112345878A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Abstract
The invention provides an on-line monitoring and evaluating device for the electric energy quality of a ship power supply system, which is used for on-line monitoring and evaluating a ship electric propulsion AC/DC power supply system, and comprises surge current, current unbalance, pulse load, jump load, harmonic analysis, voltage deviation, voltage sag, transient voltage deviation, peak voltage, ripple voltage, relative values of voltage change, line voltage unbalance, frequency deviation, transient frequency recovery time and frequency periodic change, has man-machine interaction, historical data query, waveform analysis record and data communication, can adaptively correct electric energy quality index evaluation weight, can give an electric energy quality comprehensive evaluation result in real time, has the minimum monitoring duration of electric energy quality characteristic parameters of the electric propulsion AC/DC power supply system of 0.8us and the sampling precision of 2.498mV, the process from sampling to data analysis of 69 electrical measurement channels is completed within 50 ms.
Description
Technical Field
The invention relates to an on-line monitoring and evaluating device for the electric energy quality of a ship, in particular to an on-line monitoring and evaluating device for the electric energy quality of an alternating current and direct current power supply system of an electric propulsion ship.
Background
The comprehensive electric propulsion ship has the characteristics of excellent control performance, energy conservation, emission reduction, flexible arrangement and good economy. The green and low carbon is the mainstream trend of the current ships, and with the large application of the comprehensive electric propulsion system in engineering ships, scientific research ships, ocean platforms and hybrid ships and the penetration of multiple energy sources, a large number of electric and electronic devices, such as weak-current power devices of a multi-pulse rectifier, a four-quadrant frequency converter, a wind/light/hydrogen/storage converter and the like, bring great challenges to the electric energy quality and electromagnetic compatibility of a ship power supply system, and have some new problems as mentioned below.
As power electronics get on board, in addition to steady state deviations in voltage and frequency, the use of large capacity propulsion devices presents more prominent transient disturbances and harmonic pollution problems, presenting greater challenges to the design of power supply systems.
The electromagnetic interference of the ship comes from various ship electrical equipment, and compared with the traditional ship, the electromagnetic compatibility problem of the electrically propelled ship is further highlighted due to the continuous rising of the capacity and the voltage grade of the electrical equipment, so that the electromagnetic compatibility of the system is more challenged.
In the previous engineering ship entry-level specification, only a small amount of deviation requirements and power supply end harmonic range requirements are required for the transient state and the steady state of the electric energy quality, and the real-time characteristic of the electric energy quality of a system is not forcibly required, so that the power supply quality and the reliability of a green low-carbon ship are extremely unfavorable.
If the problems of online monitoring and real-time evaluation of the electric energy quality of the system can be solved, the problems of the electric energy quality of a power supply end and the power supply reliability of a power receiving end of the system can be ensured, and a good solution can be provided for the optimal control of an energy management system and the electromagnetic compatibility of the system.
Disclosure of Invention
The purpose of the invention is: the method is used for carrying out online monitoring and real-time assessment on the electric energy quality of the ship power supply system so as to solve the problems of electric energy quality and electromagnetic compatibility caused by power electronic devices of the conventional ship power supply system.
In order to achieve the above object, the present invention provides an online monitoring and evaluating device for power quality of a ship power supply system, which is used for online monitoring and evaluating power quality of a ship power propulsion ac/dc power supply system, and implementing real-time interaction with an energy management system, a comprehensive control system, etc., wherein a minimum monitoring duration of power quality characteristic parameters of the ship power propulsion ac/dc power supply system is 0.8us, a sampling precision can reach 2.498mV, and a process from sampling to data analysis of 69 electrical measurement channels can be completed within 50ms, and the online monitoring and evaluating device is characterized by comprising:
the voltage conversion and conditioning module is used for carrying out secondary conversion and signal processing on three-phase voltage signals of a power supply end in the electric propulsion AC/DC power supply system;
the current conversion and conditioning module is used for carrying out secondary conversion and signal processing on three-phase current signals output by a generator set and three-phase current signals of a load branch in the electric propulsion AC/DC power supply system;
the PXI system integrates a PXI controller and a data synchronization acquisition card, acquires voltage signals and current signals acquired by a voltage conversion conditioning module and a current conversion conditioning module through a shielded cable by using the data synchronization acquisition card, integrates electric energy quality online measurement analysis and evaluation software, calculates electric quantity signals converted and conditioned by a peripheral mutual inductor through the PXI controller, analyzes electric energy quality, comprehensively evaluates, judges accidents, gives an alarm and records to realize online measurement analysis and evaluation of electric energy quality, uploads the electric energy signals to an upper computer through an integrated case, and communicates the electric energy signals to an energy management system and a comprehensive control system.
Preferably, the electric propulsion alternating current-direct current power supply system comprises a plurality of main diesel generator sets, a distribution board, a propulsion load, a linear load and an incoming line power grid, different network structures of an open loop and a closed loop can be realized, and transient and steady-state characteristics of the system under the grid working condition of different loads of 6-pulse, 12-pulse, virtual 24-pulse, AFE propulsion and new energy/dry load can be simulated.
Preferably, there are at least 5 voltage conversion conditioning modules for acquiring at least 40 voltage signals, each voltage conversion conditioning module includes a voltage transformer peripheral circuit for detecting voltage signals and a relay drive circuit for transmitting the voltage signals detected by the voltage transformer peripheral circuit to the data synchronization acquisition card through the shielded cable, and the precision of a voltage transformer used by the voltage transformer peripheral circuit is not lower than 0.1%.
Preferably, the current conversion conditioning module is configured to collect at least 56 paths of current signals, and includes 5 small current sampling conditioning modules and 2 large current collecting modules, each small current sampling conditioning module or each large current collecting module includes a current transformer peripheral circuit configured to detect a current signal and a current signal digital input contact driving circuit configured to transmit the current signal detected by the current transformer peripheral circuit to the data synchronization acquisition card through the shielded cable, and the precision of a current transformer used by the current transformer peripheral circuit is not lower than 0.1%.
Preferably, the sampling rate of the data synchronous acquisition card is 1.25MS/s, and the sampling precision is 2.498 mV; the controller adopts a PXI8135 processor and can be compatible with visual G language programming software; the integrated case has the functions of upper computer communication and data transmission.
Preferably, the online measurement, analysis and evaluation software is used for online analysis and evaluation of the power quality of the ship power supply system, and comprises surge current, current imbalance, pulse load, jump load, harmonic analysis, voltage deviation, voltage sag, transient voltage deviation, spike voltage, ripple voltage, relative values of voltage variation, line voltage imbalance, frequency deviation, transient frequency recovery time and frequency periodic variation of a power grid; the sampling rate of the electric energy quality online measurement, analysis and evaluation software can reach 25kHz at most, and the electric energy quality online measurement, analysis and evaluation software has the functions of fault-tolerant self-checking, real-time testing, man-machine interaction, historical data query and waveform analysis recording; the electric energy quality online measurement and evaluation adopts an electric energy quality fuzzy comprehensive evaluation method based on entropy weight, can adaptively correct the electric energy quality index evaluation weight, adaptively optimize the comprehensive evaluation result, can give the electric energy quality comprehensive evaluation result in real time, give a plan and an alarm to the electric energy quality of a ship medium-voltage power grid, and can realize data communication with the existing energy management system, the comprehensive control system and the like of the ship.
Preferably, the electric energy quality online measurement analysis software analyzes the waveform and transient data of all electric quantities by adopting improved fourier transform and wavelet transform, correctly positions time of occurrence, and calculates electric energy quality characteristic parameters of a network side and different branches in real time.
The device for monitoring and evaluating the power quality of the ship power supply system on line has the functions of analyzing and evaluating the power quality on line, data communication and man-machine interaction, can realize the real-time analysis and evaluation of the transient and steady power quality characteristic parameters of power supply branches and different load branches, can realize the real-time interaction with an energy management system, a comprehensive control system and the like, realizes the optimized control of equipment, and transmits data to an upper computer.
Compared with the prior art, the invention has the beneficial effects that: the device for monitoring and evaluating the electric energy quality of the ship power supply system on line can analyze and evaluate the transient state and steady state electric energy quality characteristic parameters of the power supply branch and different load branches in real time, can ensure the reliability and stability of the system power supply, can realize real-time interaction with an energy management system and a comprehensive control system through the communication of an upper computer, realizes the optimal control of equipment, can effectively solve the problems of power oscillation, harmonic pollution, common mode, differential mode and the like of the system caused by the electric energy quality, electromagnetic interference and the like, and realizes the comprehensive utilization of the energy of the ship power supply system.
Drawings
Fig. 1 is a system block diagram of an online monitoring and evaluating device for power quality of a ship power supply system according to the present invention;
FIG. 2 is a comprehensive evaluation model employed by the comprehensive evaluation module;
FIG. 3 is a real-time analysis model of power quality according to the present invention;
FIG. 4 is a diagram of an embodiment of an on-line power quality analysis hardware design;
FIG. 5A is a schematic diagram of a voltage sampling circuit;
FIG. 5B is a schematic diagram of a relay driver circuit;
FIG. 6A is a schematic diagram of a current sampling circuit;
fig. 6B is a schematic diagram of an external signal trigger circuit.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The invention provides an on-line monitoring and evaluating device for the electric energy quality of a ship power supply system, which is used for on-line monitoring and evaluating the electric energy quality of a ship electric propulsion AC/DC power supply system, comprises surge current, current unbalance degree, pulse load, jump load, harmonic analysis, voltage deviation, voltage dip, transient voltage deviation, peak voltage, ripple voltage, relative value of voltage change, line voltage unbalance degree, frequency deviation, transient frequency recovery time, frequency periodic change and the like of a power grid, has the functions of man-machine interaction, historical data query, waveform analysis recording, data communication and the like, can adaptively correct electric energy quality index evaluation weight, gives out an electric energy quality comprehensive evaluation result in real time, and has the minimum monitoring duration of electric energy quality characteristic parameters of the electric propulsion AC/DC power supply system of 0.8us, The sampling precision can reach 2.498mV, and the process from sampling to data analysis of 69 electrical measurement channels is completed within 50 ms.
As shown in fig. 1, the device for monitoring and evaluating the power quality of the ship power supply system on line provided by the invention comprises a diesel generator set, a distribution board, an AFE propulsion load, a virtual 24-pulse propulsion load, a new energy load, a linear load, a primary power quality on-line measurement transformer, a voltage transformer conditioning module, a current transformer conditioning module, a synchronous acquisition card, a controller, power quality on-line measurement analysis and evaluation software, a human-computer interface, a communication line and the like. The on-line monitoring and evaluating device provided by the invention realizes the collection and the evaluation of characteristic parameters of the electric energy quality (comprising 6 generator set outlet three-phase voltage signals, 3 power station busbar three-phase voltage signals and AFE frequency converter feedback to an incoming line power grid three-phase voltage signal, as marked by a square frame in figure 1, and a current signal collection 39 circuit corresponding to 6 generator sets output three-phase current signals, 6 pulse frequency converter branches and AFE feedback branch three-phase current signals thereof, 12 pulse main propulsion frequency conversion branches and three-phase current signals fed back to the incoming line power grid branches and one linear load branch current signal, as marked by a circle in figure 1) through an electric energy quality on-line measuring primary mutual inductor, a secondary voltage/current conditioning circuit, a collection card synchronizer, a human-machine interaction software interface and a controller, Signal processing, software analysis and feedback, and hardware synchronous output, so as to realize data transmission with the energy management system and the comprehensive control system.
The specific implementation of the online measurement analysis and evaluation software of the electric energy quality: the software in the system adopts a modular design and comprises a login module, a function analysis module, an event generation and processing module and a comprehensive evaluation module. The function analysis module is mainly divided into a voltage and current acquisition module, a voltage and current signal caching module and a signal analysis module. The signal analysis module comprises effective value frequency power calculation, harmonic analysis, voltage unbalance analysis, voltage fluctuation flicker analysis, voltage transient analysis and the like. Each module performs analysis simultaneously. The frequency, effective value and power calculation analysis is the most basic voltage and current analysis function. When the channel buffer area has voltage and current signals of 10 cycles, signal analysis is carried out. Firstly, converting the collected line voltage signal into a phase voltage signal, and secondly, removing the interference direct current quantity of the voltage signal and the current signal to prevent inaccurate calculation. And calibrating the acquired voltage and current signals, and calculating the actual active power, reactive power and power factors of the equipment by using the calibrated actual values. The waveform frequency is calculated every 10s according to IEC standard requirements. And calculating the effective value of the voltage and the current by using the actual waveform after the voltage and the current are scaled. Harmonic analysis is an important index of electric energy quality analysis, harmonic information of voltage and current waveforms is obtained through voltage FFT calculation and current FFT calculation of real-time cache waveforms of 10 cycles, 2-100 times of voltage harmonic amplitudes can be obtained according to voltage spectrum information output by the voltage FFT calculation, and the total harmonic distortion rate of each phase voltage is calculated by utilizing the voltage spectrum information. And obtaining the amplitude of each harmonic wave and the total harmonic distortion rate of the current according to the FFT calculation and the THD calculation of the current in the same way. And thirdly, analyzing the unbalance degree of the voltage (three-phase unbalance analysis) mainly analyzes the three-phase symmetry condition and whether zero negative sequence current exists or not. Obtaining voltage and current frequency spectrum information through voltage FFT calculation and current FFT calculation according to the voltage and current cache information of 10 cycles, then calculating voltage positive, negative and zero sequence voltage amplitudes through voltage and current positive sequence negative sequence zero sequence phase sequence separation by utilizing the voltage and current frequency spectrum information, and finally calculating the three-phase voltage and current unbalance degree by utilizing each phase sequence amplitude value of the voltage and the current. And analyzing voltage fluctuation and flicker, namely firstly performing instantaneous flicker fluctuation calculation according to the 10 voltage cycle signals and performing short-time flicker fluctuation calculation according to the real-time vision value calculated by the instantaneous flicker. And judging whether the voltage fluctuation exceeds the limit according to the short-time flicker fluctuation calculation result, if the continuous fluctuation exceeding limit is more than 10min, turning on a short-time fluctuation indicator light, using the output result as the calculation input of the long-time fluctuation, and if the continuous fluctuation exceeding limit is not more than 10min, continuing to judge. The long-time fluctuation calculation is the continuous accumulation of the short-time fluctuation, and if the continuous fluctuation exceeds 2 hours, the long-time fluctuation indicates to alarm. Voltage transient analysis is to check some transient variation conditions, perform voltage transient analysis by using a real-time buffer storage amount of 10 cycle scalar voltages, select ABC three-phase voltage to be analyzed, detect a voltage waveform transient disturbance point through discrete wavelet transformation, and alarm and store transient waveforms if transient events are detected. If not, the determination is continued. The event generation processing module comprises the following contents: when the waveform analysis result exceeds the electric energy quality index, the transient waveform and the steady-state waveform need to be stored. A transient event is generated and the current waveform is immediately saved. And (4) judging whether the steady-state data such as voltage and current frequency and THD exceed the limit for 10 seconds, if so, storing the real-time waveform, and if not, continuing to judge. And the comprehensive evaluation module is used for comprehensively evaluating the electric energy quality, comprehensively analyzing enumerated experiments and evaluation results according to monitoring data and generated reports of the comprehensive evaluation system, establishing an entropy weight-based fuzzy comprehensive evaluation model, solving target weights of all indexes of the electric energy quality according to difference coefficients of single indexes, and solving the target weights of all indexes of the electric energy quality, wherein the comprehensive evaluation model adopted by the comprehensive evaluation module is shown in figure 2.
The real-time implementation of the system electric energy quality: in the system, two-stage voltage/current conversion conditioning is adopted, the precision of a primary mutual inductor is controlled to be 0.2 grade, the precision of a secondary voltage/current conditioning module is more than 0.1 grade, the synchronous data acquisition of 69 paths of electric quantities is realized through a synchronous acquisition card with the sampling rate of 1.25MS/s, the voltage acquisition channel and the current acquisition channel of the equipment are set, filtered and limited, in order to analyze the accuracy and the real-time performance of waveforms, data caching, analysis calculation and calibration processing are required to be carried out on every 10 cycles of voltage and current signals, and data packet loss is prevented through a fault-tolerant mechanism. Through the programmed data real-time analysis software, as shown in fig. 3, the time from sampling to data output is calculated in real time, and the results are as follows: 1) the analysis time is 36-44 ms; 2) the storage capacity of 200 cycles of 6 channels is 2.5M.
The specific implementation of the hardware design of the online analysis of the electric energy quality is as follows: as shown in FIG. 4, a high-performance high-speed synchronous acquisition card PXI6358 is adopted, the total number of analog acquisition channels is 80, a certain channel margin is reserved, the acquisition signal range is-10V, the voltage acquired by the mutual inductor can be converted into weak current signals for acquisition, the highest sampling rate is 1.25M (25kHz), the sampling precision can reach 2.498mV, and most of spike pulse signal acquisition analysis is met. The signal conditioning module comprises voltage acquisition unit and current acquisition unit, and voltage acquisition unit comprises 5 voltage sampling conditioning modules, and 8 routes of signals are gathered to every module, can convert at least 30 routes of signals simultaneously. Fig. 5A is a schematic diagram of a voltage sampling circuit, fig. 5B is a schematic diagram of a relay driving circuit, fig. 6A is a schematic diagram of a current sampling circuit, and fig. 6B is a schematic diagram of an external signal trigger circuit. The current acquisition unit comprises 5 undercurrent sampling and conditioning modules and 2 heavy current sampling and conditioning modules, and 8 routes of signals are acquired by each module, so that the requirement of acquiring 39 routes of current signals can be met. The controller adopts a 2.3GHz fundamental frequency, 3.3GHz (single-core Turbo Boost mode) quad-core processor and a dual-channel 1,600MHz DDR3 memory, so that the test time can be greatly shortened. The chassis is provided with a high-bandwidth backboard, so that the requirements of various high-performance test and measurement applications can be met, a module compatible with a standard PXI mixed bus is supported by 4 slots at most, and the built-in timing and synchronization characteristics of the latest PXI are integrated.
Implementation of data interaction with an energy management system and an integrated control system: the data obtained by the system power quality measurement analysis software is communicated with an upper computer, a comprehensive control system and an energy management system through a controller serial port bus, the system power quality characteristics can be used as input conditions of the energy management and comprehensive control system, and the optimal control, comprehensive utilization and real-time monitoring of system energy management are realized.
Claims (7)
1. The utility model provides a boats and ships power supply system electric energy quality on-line monitoring and evaluation device for carry out on-line monitoring and aassessment to the electric propulsion alternating current-direct current power supply system electric energy quality of boats and ships, realize with energy management system, the real-time interaction of integrated control system etc, minimum monitoring duration to electric propulsion alternating current-direct current power supply system electric energy quality characteristic parameter is 0.8us, the sampling precision can reach 2.498mV, can accomplish 69 electric measurement passageways within 50ms from the process of sampling to data analysis, a serial communication port, include:
the voltage conversion and conditioning module is used for carrying out secondary conversion and signal processing on three-phase voltage signals of a power supply end in the electric propulsion AC/DC power supply system;
the current conversion and conditioning module is used for carrying out secondary conversion and signal processing on three-phase current signals output by a generator set and three-phase current signals of a load branch in the electric propulsion AC/DC power supply system;
the PXI controller integrates online measurement, analysis and evaluation software of the electric energy quality and is used for calculating, analyzing the electric energy quality, comprehensively evaluating, judging accidents, alarming and recording electric quantity signals converted and conditioned by the peripheral mutual inductor.
The PXI system integrates a PXI controller and a data synchronization acquisition card, the data synchronization acquisition card is used for acquiring voltage signals and current signals acquired by a voltage conversion conditioning module and a current conversion conditioning module through a shielded cable, the PXI controller integrates electric energy quality online measurement analysis and evaluation software, the calculation, electric energy quality analysis, comprehensive evaluation, accident judgment, alarming and recording of electric quantity signals converted and conditioned by a peripheral mutual inductor are performed through the PXI controller, so that the electric energy quality online measurement analysis and evaluation are realized, the electric energy quality online measurement analysis and evaluation are uploaded to an upper computer through an integrated cabinet, and the electric energy management system and the comprehensive control system are communicated.
2. The device for on-line monitoring and evaluation of electric energy quality of a ship power supply system according to claim 1, wherein the electric propulsion ac/dc power supply system comprises a plurality of main diesel generator sets, a distribution board, a propulsion load, a linear load and an incoming line power grid, and can realize different network structures of open loop and closed loop, and can simulate transient and steady-state characteristics of the system under grid conditions of different loads of 6 pulses, 12 pulses, virtual 24 pulses, AFE propulsion and new energy/dry load.
3. The device according to claim 1, wherein there are at least 5 voltage conversion conditioning modules for collecting at least 40 voltage signals, each voltage conversion conditioning module includes a voltage transformer peripheral circuit for detecting voltage signals and a relay driver circuit for transmitting the voltage signals detected by the voltage transformer peripheral circuit to the data synchronization acquisition card through the shielded cable, and the precision of a voltage transformer used by the voltage transformer peripheral circuit is not lower than 0.1%.
4. The device according to claim 1, wherein the current conversion conditioning module is configured to collect at least 56 current signals, and includes 5 small current sampling conditioning modules and 2 large current collecting modules, each small current sampling conditioning module or each large current collecting module includes a current transformer peripheral circuit configured to detect a current signal and a current signal digital input contact driving circuit configured to transmit the current signal detected by the current transformer peripheral circuit to the data synchronization acquisition card through the shielded cable, and the accuracy of a current transformer used by the current transformer peripheral circuit is not lower than 0.1%.
5. The device for on-line monitoring and evaluating the electric energy quality of the ship power supply system according to claim 1, wherein the sampling rate of the data synchronous acquisition card is 1.25MS/s, and the sampling precision is 2.498 mV; the controller adopts a PXI8135 processor and can be compatible with visual G language programming software; the integrated case has the functions of upper computer communication and data transmission.
6. The device for on-line monitoring and evaluation of power quality of a ship power supply system according to claim 1, wherein the software for on-line measurement, analysis and evaluation of power quality of a ship power supply system is used for on-line analysis and evaluation of power quality of the ship power supply system, and comprises surge current, current imbalance, pulse load, jump load, harmonic analysis, voltage deviation, voltage sag, transient voltage deviation, peak voltage, ripple voltage, relative value of voltage variation, line voltage imbalance, frequency deviation, transient frequency recovery time, and frequency periodic variation of a power grid; the sampling rate of the electric energy quality online measurement, analysis and evaluation software can reach 25kHz at most, and the electric energy quality online measurement, analysis and evaluation software has the functions of fault-tolerant self-checking, real-time testing, man-machine interaction, historical data query and waveform analysis recording; the electric energy quality online measurement and evaluation adopts an electric energy quality fuzzy comprehensive evaluation method based on entropy weight, can adaptively correct the electric energy quality index evaluation weight, adaptively optimize the comprehensive evaluation result, can give the electric energy quality comprehensive evaluation result in real time, give a plan and an alarm to the electric energy quality of a ship medium-voltage power grid, and can realize data communication with the existing energy management system, the comprehensive control system and the like of the ship.
7. The device for on-line monitoring and evaluation of electric energy quality of ship power supply system according to claim 1, wherein said on-line measuring and analyzing software for electric energy quality analyzes waveform and transient data of all electric quantities by using modified fourier transform and wavelet transform, correctly locates time of occurrence, and calculates electric energy quality characteristic parameters of network side and different branches in real time.
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