CN103837777A - Method and system for power quality assessment of power supply system - Google Patents
Method and system for power quality assessment of power supply system Download PDFInfo
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Abstract
The invention relates to a method and system for a power quality assessment of a power supply system. The method comprises the following steps that power quality indexes to be assessed input by a user and limit value information of the power quality indexes are received; assessment period information of the power quality indexes input by the user is received, wherein the assessment period comprises a plurality of computing periods; corresponding power parameters of all the computing periods are collected according to a preset power quality index computing method, and the power quality indexes of all the computing periods are computed according to the power parameters; the power quality indexes, obtained through computing, of all the computing periods are compared with limit values of the power quality indexes, and whether the power quality indexes of all the computing periods are qualified or not is determined; statistics of the percent of pass of the power quality indexes within the assessment period is conducted according to the qualified conditions of the power quality indexes of all the computing periods. By the adoption of the technical scheme, overseas power quality monitoring devices can be made to meet the power quality assessment standards of China and can also be applied to the power quality assessment and monitoring of China.
Description
Technical field
The present invention relates to Power quality management technical field, relate in particular to a kind of electric power system electricity quality evaluation method and system.
Background technology
In recent years, along with widespread use and the development of Power Electronic Technique, in electric power system, increase a large amount of nonlinear loads, can cause that power network current, voltage waveform distort, caused the harmonic wave " pollution " of electrical network.As heavy (merchant) mill, electric locomotive etc., in servicely not only can produce a large amount of higher hamonic waves, and voltage fluctuation, flickering, three-phase imbalance are on the rise.These not only can cause the security of electricity supply and use equipment itself to reduce to the adverse effect of electrical network, and the economical operation of meeting severe jamming electrical network, cause " public hazards " of electrical network.On the other hand, increasing new technology, new technical equipment are more and more harsher to the requirement of power supply quality, so many industrial flow-lines, sophisticated manufacturing, computer network and the various device etc. of serving the places such as Surveillance center.The raising that user requires power supply quality, becomes increasingly conspicuous power quality problem, is necessary to set up electric energy quality monitoring system, and whole distrbution network power quality data is monitored, analyzed, and takes measures to improve the distrbution network quality of power supply.
American-European countries's electric energy quality monitoring management is more Zao than China's starting, Monitoring and Controlling quality of power supply state-of-art is than China advanced person, but the electric energy quality detection device of foreign brand name generally according to European Union's standard EN 50610 or IEC61000 series standard design produce, partial properties index does not also meet the quality of power supply standard of China.In order to judge whether random larger index meets limit value, and the GB of 2008 editions has provided the concept of 95% probable value, and it is mainly used in voltage three-phase imbalance, harmonic wave, a harmonic wave.95% probable value is for a period of time, such as requiring in time of one day, has time of 95% to meet the demands, and thinks qualified.In European Union and IEC standard, all do not comprise 95% probable value, but this value is a significant data of weighing the quality of power supply in China's standard.And after the calculation interval of traditional electric energy quality detection device statistics arranges, cannot revise.And in actual production use procedure, be likely to wish by obtaining the data of different calculation intervals, data are analyzed, assess.That just must readjust equipment calculation interval, again obtains raw data.Both lost time like that, comparability is not strong (data are not the data of same period).Make external equipment for monitoring power quality meet domestic demand, must use a kind of electric power system electricity quality evaluation method, to meet China's electricity quality evaluation standard.
Summary of the invention
Technical matters to be solved by this invention is: a kind of electric power system electricity quality evaluation method and system are provided, make external equipment for monitoring power quality can meet domestic demand.The present invention is achieved in that
A kind of electric power system electricity quality evaluation method, comprises the steps:
Receive power quality index and the limits value information thereof of the plan assessment of user's input;
The assessment period information that receives the described power quality index of user's input, the described assessment period comprises some calculation intervals;
Gather the corresponding electrical energy parameter of each calculation interval according to default power quality index computing method, and calculate accordingly the power quality index of each calculation interval;
The power quality index of the each calculation interval calculating and its limits value are compared, determine that whether the power quality index of each calculation interval is qualified;
According to the qualification rate of described power quality index in the Qualification statistics described assessment period of each calculation interval power quality index.
Further, described power quality index comprises any one or more as follows:
Voltage deviation, voltage fluctuation rate, total harmonic distortion;
Wherein, the computing method of described voltage deviation comprise the steps:
Gather the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage deviation according to default voltage deviation computing formula and the first default collection period, and calculate the voltage deviation of described electric power system at this calculation interval according to described voltage deviation computing formula; The calculation interval of described plan calculating voltage deviation comprises some described the first collection period;
For 35KV and above electric power system:
In the time that Umax and Umin are greater than Un, voltage deviation=[(Umax-Un)/Un] × 100%;
In the time that Umax and Umin are less than Un, voltage deviation=[(Umin-Un)/Un] × 100%;
When other situations, voltage deviation=[(Umax-Umin)/Un] × 100%;
For 20KV and following three-phase power supply system, voltage deviation comprises the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%;
Voltage lower deviation=[(Umin-Un)/Un] × 100%;
For the unidirectional electric power system of 220V, voltage deviation also comprises the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%;
Voltage lower deviation=[(Umin-Un)/Un] × 100%;
The computing method of described voltage fluctuation rate comprise the steps:
Gather the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage stability bandwidth according to default voltage fluctuation rate computing formula and the second default collection period; The calculation interval of described plan calculating voltage stability bandwidth comprises some described the second collection period; The computing formula of described voltage fluctuation rate is: voltage fluctuation rate=[(Umax-Umin)/Un] × 100%;
Judge described electric power system the Umax of the calculation interval of described plan calculating voltage stability bandwidth and Umin whether be all greater than zero and Umax be greater than Umin, if it is calculate the voltage fluctuation rate of described electric power system at this calculation interval according to described voltage fluctuation rate computing formula, otherwise do not calculate;
The peaked computing method of described total harmonic distortion comprise the steps:
Gather the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage total harmonic distortion according to default total harmonic distortion computing formula and the 3rd default collection period, and calculate the described electric power system total harmonic distortion of each the voltage parameter acquisition time in this calculation interval according to described total harmonic distortion computing formula; The calculation interval of described plan calculating voltage total harmonic distortion comprises some described the 3rd collection period; Described total harmonic distortion computing formula is: total harmonic distortion=(root-mean-square valve/fundamental voltage effective value of each harmonic voltage) × 100%;
In above-mentioned all formula, each meaning of parameters is:
Umax: the maximum voltage that detects; Umin: minimum detection voltage; Un: the rated voltage of electric power system.
Further, described electric power system electricity quality evaluation method also comprises the steps:
Get the maximal value in the total harmonic distortion of the each voltage parameter acquisition time in the described calculation interval calculating, the total harmonic distortion maximal value as described electric power system at this calculation interval;
The total harmonic distortion maximal value of each calculation interval is arranged in order according to magnitude relationship, casts out maximum 5% value, get value maximum in the value of residue 95% as the large value of total harmonic distortion 95% probability;
The described total harmonic distortion large value of 95% probability and its limits value are compared, and judge that according to comparative result whether it is qualified.
A kind of electric power system electricity quality evaluation system, comprising:
Power quality index setting module, power quality index and the limits value information thereof assessed for receiving the plan of user's input;
Assessment period setting module, for receiving the assessment period information of described power quality index of user input, the described assessment period comprises some calculation intervals;
Power quality index computing module, for gather the corresponding electrical energy parameter of each calculation interval according to default power quality index computing method, and calculates the power quality index of each calculation interval accordingly;
Power quality index evaluation module, for the power quality index of the each calculation interval calculating and its limits value are compared, determines that whether the power quality index of each calculation interval is qualified;
Power quality index statistical module, for adding up the qualification rate of described power quality index in the described assessment period according to the Qualification of each calculation interval power quality index.
Further, described power quality index comprises any one or more as follows:
Voltage deviation, voltage fluctuation rate, total harmonic distortion;
Described power quality index computing module comprises any one or more as follows:
Voltage deviation computing module, voltage fluctuation rate computing module, total harmonic distortion computing module;
Described voltage deviation computing module is used for gathering the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage deviation according to default voltage deviation computing formula and the first default collection period, and calculates the voltage deviation of described electric power system at this calculation interval according to described voltage deviation computing formula; The calculation interval of described plan calculating voltage deviation comprises some described the first collection period;
For 35KV and above electric power system:
In the time that Umax and Umin are greater than Un, voltage deviation=[(Umax-Un)/Un] × 100%;
In the time that Umax and Umin are less than Un, voltage deviation=[(Umin-Un)/Un] × 100%;
When other situations, voltage deviation=[(Umax-Umin)/Un] × 100%;
For 20KV and following three-phase power supply system, voltage deviation comprises the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%;
Voltage lower deviation=[(Umin-Un)/Un] × 100%;
For the unidirectional electric power system of 220V, voltage deviation also comprises the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%;
Voltage lower deviation=[(Umin-Un)/Un] × 100%;
Described voltage fluctuation rate computing module is for gathering the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage stability bandwidth according to default voltage fluctuation rate computing formula and the second default collection period, judge described electric power system the Umax of the calculation interval of described plan calculating voltage stability bandwidth and Umin whether be all greater than zero and Umax be greater than Umin, if it is calculate the voltage fluctuation rate of described electric power system at this calculation interval according to described voltage fluctuation rate computing formula, otherwise do not calculate; The calculation interval of described plan calculating voltage stability bandwidth comprises some described the second collection period; The computing formula of described voltage fluctuation rate is: voltage fluctuation rate=[(Umax-Umin)/Un] × 100%;
Described total harmonic distortion computing module is used for gathering the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage total harmonic distortion according to default total harmonic distortion computing formula and the 3rd default collection period, and calculates the described electric power system total harmonic distortion of each the voltage parameter acquisition time in this calculation interval according to described total harmonic distortion computing formula; The calculation interval of described plan calculating voltage total harmonic distortion comprises some described the 3rd collection period; Described total harmonic distortion computing formula is: total harmonic distortion=(root-mean-square valve/fundamental voltage effective value of each harmonic voltage) × 100%;
In above-mentioned all computing formula, each meaning of parameters is:
Umax: the maximum voltage that detects; Umin: minimum detection voltage; Un: the rated voltage of electric power system.
Further, described power quality index evaluation module also comprises the large value evaluation module of total harmonic distortion 95% probability, the large value evaluation module of described total harmonic distortion 95% probability is for getting the maximal value in the total harmonic distortion of each voltage parameter acquisition time of the described calculation interval calculating, total harmonic distortion maximal value as described electric power system at this calculation interval, the total harmonic distortion maximal value of each calculation interval is arranged in order according to magnitude relationship, cast out maximum 5% value, get value maximum in the value of residue 95% as the large value of total harmonic distortion 95% probability, the described total harmonic distortion large value of 95% probability and its limits value are compared, and judge that according to comparative result whether it is qualified.
Compared with prior art, adopt electric power system electricity quality evaluation method and system provided by the invention can make external equipment for monitoring power quality meet China's electricity quality evaluation standard, make external equipment for monitoring power quality also can be applicable to the electricity quality evaluation monitoring of China.
Accompanying drawing explanation
Fig. 1: the electric power system electricity quality evaluation method overall procedure schematic diagram that the embodiment of the present invention provides;
Fig. 2: voltage deviation computing method schematic flow sheet in above-mentioned electric power system electricity quality evaluation method flow;
Fig. 3: voltage fluctuation rate computing method schematic flow sheet in above-mentioned electric power system electricity quality evaluation method flow;
Fig. 4: the large value calculating method schematic flow sheet of total harmonic distortion 95% probability in above-mentioned electric power system electricity quality evaluation method flow;
Fig. 5: the electric power system electricity quality evaluation system composition schematic diagram that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only for explaining the present invention, is not intended to limit the present invention.
The electric power system electricity quality evaluation method overall procedure schematic diagram that Fig. 1 provides for the embodiment of the present invention, shown in Fig. 1, the basic procedure of electric power system electricity quality evaluation method is as follows:
The selected power quality index of intending assessment, and its limits value is set.Power quality index comprises many-side, according to concerned countries standard, comprises voltage deviation, voltage fluctuation rate, total harmonic distortion etc.For a selected power quality index, assessment is all carried out within certain assessment period, therefore, the assessment period need to be set, meanwhile, the set assessment period is also divided into multiple calculation intervals, can calculate a power quality index at each calculation interval.Each power quality index of intending assessment is all preset with its computing method, and computing method have comprised the computing formula of this power quality index, clearly in computing formula will calculate the parameter that this power quality index need to obtain.Therefore, can gather the corresponding electrical energy parameter of each calculation interval according to default power quality index computing method, then calculate the power quality index of each calculation interval according to the computing formula in computing method.Calculating after the power quality index of each calculation interval, itself and its limits value is compared, thereby whether this power quality index that judges each calculation interval is qualified, then add up the qualification rate of this power quality index in set assessment period according to the Qualification of this power quality index of each calculation interval.
The computing method of voltage deviation comprise the steps:
Set corresponding voltage deviation computing formula according to the electric pressure of electric power system;
Gather the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage deviation according to described voltage deviation computing formula and the first default collection period, and calculate the voltage deviation of described electric power system at this calculation interval according to described voltage deviation computing formula; The calculation interval of described plan calculating voltage deviation comprises some described the first collection period;
Shown in Fig. 2, for 35KV and above electric power system:
In the time that Umax and Umin are greater than Un, voltage deviation=[(Umax-Un)/Un] × 100%;
In the time that Umax and Umin are less than Un, voltage deviation=[(Umin-Un)/Un] × 100%;
When other situations, voltage deviation=[(Umax-Umin)/Un] × 100%;
For 20KV and following three-phase power supply system, voltage deviation comprises the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%;
Voltage lower deviation=[(Umin-Un)/Un] × 100%;
For the unidirectional electric power system of 220V, voltage deviation also comprises the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%;
Voltage lower deviation=[(Umin-Un)/Un] × 100%.
The computing method of voltage fluctuation rate comprise the steps:
Setting voltage stability bandwidth computing formula: voltage fluctuation rate=[(Umax-Umin)/Un] × 100%;
Gather the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage stability bandwidth according to described voltage fluctuation rate computing formula and the second default collection period; The calculation interval of described plan calculating voltage stability bandwidth comprises some described the second collection period;
Shown in Fig. 3, judge described electric power system the Umax of the calculation interval of described plan calculating voltage stability bandwidth and Umin whether be all greater than zero and Umax be greater than Umin, if it is calculate the voltage fluctuation rate of described electric power system at this calculation interval according to described voltage fluctuation rate computing formula, otherwise do not calculate the voltage fluctuation rate of this calculation interval, and continuation gathers Umax and the Umin of next period, judge and calculate stability bandwidth according to preceding method, so each calculation interval being carried out to identical judgement and calculating.
The peaked computing method of total harmonic distortion comprise the steps:
Setting voltage total harmonic distortion computing formula: total harmonic distortion=(root-mean-square valve/fundamental voltage effective value of each harmonic voltage) × 100%;
Gather the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage total harmonic distortion according to described total harmonic distortion computing formula and the 3rd default collection period, and calculate the described electric power system total harmonic distortion of each the voltage parameter acquisition time in this calculation interval according to described total harmonic distortion computing formula, and get maximal value in the each total harmonic distortion calculating as described electric power system the total harmonic distortion maximal value at this calculation interval; The calculation interval of described plan calculating voltage total harmonic distortion comprises some described the 3rd collection period.
In above-mentioned all formula, each meaning of parameters is:
Umax: the maximum voltage that detects; Umin: minimum detection voltage; Un: the rated voltage of electric power system.
Above-mentioned assessment period, calculation interval, each collection period can arrange different values according to requirements such as electricity quality evaluation precision, for example, collection period, calculation interval and assessment period are set to respectively to 3 seconds, 5 minutes and 24 hours etc.
Different from the appraisal procedure of voltage deviation and voltage fluctuation is, for the assessment of electric power system voltage harmonic, China's national standard is to adopt to judge whether the large value of total harmonic distortion 95% probability exceeds limits value and judge that whether electric power system voltage harmonic is qualified.National standard is defined as the large value of 95% probability, and the large value of 95% probability refers to: be arranged in order descending measured value, give up 5% large value above, the large value of residue measured value.Therefore, detecting after the total harmonic distortion maximal value of each calculation interval, also need the total harmonic distortion maximal value of each calculation interval to be arranged in order according to size order, and cast out maximum 5% value, get value maximum in the value of residue 95% as the total harmonic distortion large value of 95% probability (as shown in Figure 4).Then the total harmonic distortion large value of 95% probability and its limits value are compared, thereby judge that whether the voltage harmonic of this electric power system within the assessment period is qualified.
According to above-mentioned electric power system electricity quality evaluation method, the embodiment of the present invention also provides a kind of electric power system electricity quality evaluation system.Shown in Fig. 5, this system comprises:
Power quality index setting module 1, power quality index and the limits value information thereof assessed for receiving the plan of user's input;
Assessment period setting module 2, for receiving the assessment period information of described power quality index of user input, the described assessment period comprises some calculation intervals;
Power quality index computing module 3, for gather the corresponding electrical energy parameter of each calculation interval according to default power quality index computing method, and calculates the power quality index of each calculation interval accordingly;
Power quality index evaluation module 4, for the power quality index of the each calculation interval calculating and its limits value are compared, determines that whether the power quality index of each calculation interval is qualified;
Power quality index statistical module 5, for adding up the qualification rate of described power quality index in the described assessment period according to the Qualification of each calculation interval power quality index.
Power quality index comprises any one or more as follows:
Voltage deviation, voltage fluctuation rate, total harmonic distortion;
Power quality index computing module 3 comprises any one or more as follows:
Voltage deviation computing module 301, voltage fluctuation rate computing module 302, total harmonic distortion computing module 303;
Voltage deviation computing module 301 is being intended the relevant voltage parameter of calculation interval of calculating voltage deviation for gather described electric power system according to default voltage deviation computing formula and the first default collection period, and calculates the voltage deviation of described electric power system at this calculation interval according to described voltage deviation computing formula; The calculation interval of described plan calculating voltage deviation comprises some described the first collection period;
For 35KV and above electric power system:
In the time that Umax and Umin are greater than Un, voltage deviation=[(Umax-Un)/Un] × 100%;
In the time that Umax and Umin are less than Un, voltage deviation=[(Umin-Un)/Un] × 100%;
When other situations, voltage deviation=[(Umax-Umin)/Un] × 100%;
For 20KV and following three-phase power supply system, voltage deviation comprises the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%;
Voltage lower deviation=[(Umin-Un)/Un] × 100%;
For the unidirectional electric power system of 220V, voltage deviation also comprises the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%;
Voltage lower deviation=[(Umin-Un)/Un] × 100%;
Voltage fluctuation rate computing module 302 is for gathering the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage stability bandwidth according to default voltage fluctuation rate computing formula and the second default collection period, judge described electric power system the Umax of the calculation interval of described plan calculating voltage stability bandwidth and Umin whether be all greater than zero and Umax be greater than Umin, if it is calculate the voltage fluctuation rate of described electric power system at this calculation interval according to described voltage fluctuation rate computing formula, otherwise do not calculate; The calculation interval of described plan calculating voltage stability bandwidth comprises some described the second collection period; The computing formula of described voltage fluctuation rate is: voltage fluctuation rate=[(Umax-Umin)/Un] × 100%;
Total harmonic distortion computing module 303 is being intended the relevant voltage parameter of calculation interval of calculating voltage total harmonic distortion for gather described electric power system according to default total harmonic distortion computing formula and the 3rd default collection period, and calculates the described electric power system total harmonic distortion of each the voltage parameter acquisition time in this calculation interval according to described total harmonic distortion computing formula; The calculation interval of described plan calculating voltage total harmonic distortion comprises some described the 3rd collection period; Described total harmonic distortion computing formula is: total harmonic distortion=(root-mean-square valve/fundamental voltage effective value of each harmonic voltage) × 100%;
In above-mentioned all computing formula, each meaning of parameters is:
Umax: the maximum voltage that detects; Umin: minimum detection voltage; Un: the rated voltage of electric power system.
Power quality index evaluation module 4 also comprises the large value evaluation module 401 of total harmonic distortion 95% probability, the large value evaluation module 401 of total harmonic distortion 95% probability is for getting the maximal value in the total harmonic distortion of each voltage parameter acquisition time of the described calculation interval calculating, total harmonic distortion maximal value as described electric power system at this calculation interval, the total harmonic distortion maximal value of each calculation interval is arranged in order according to magnitude relationship, cast out maximum 5% value, get value maximum in the value of residue 95% as the large value of total harmonic distortion 95% probability, the described total harmonic distortion large value of 95% probability and its limits value are compared, and judge that according to comparative result whether it is qualified.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. an electric power system electricity quality evaluation method, is characterized in that, comprises the steps:
Receive power quality index and the limits value information thereof of the plan assessment of user's input;
The assessment period information that receives the described power quality index of user's input, the described assessment period comprises some calculation intervals;
Gather the corresponding electrical energy parameter of each calculation interval according to default power quality index computing method, and calculate accordingly the power quality index of each calculation interval;
The power quality index of the each calculation interval calculating and its limits value are compared, determine that whether the power quality index of each calculation interval is qualified;
According to the qualification rate of described power quality index in the Qualification statistics described assessment period of each calculation interval power quality index.
2. electric power system electricity quality evaluation method as claimed in claim 1, is characterized in that, described power quality index comprises any one or more as follows:
Voltage deviation, voltage fluctuation rate, total harmonic distortion;
Wherein, the computing method of described voltage deviation comprise the steps:
Gather the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage deviation according to default voltage deviation computing formula and the first default collection period, and calculate the voltage deviation of described electric power system at this calculation interval according to described voltage deviation computing formula; The calculation interval of described plan calculating voltage deviation comprises some described the first collection period;
For 35KV and above electric power system:
In the time that Umax and Umin are greater than Un, voltage deviation=[(Umax-Un)/Un] × 100%;
In the time that Umax and Umin are less than Un, voltage deviation=[(Umin-Un)/Un] × 100%;
When other situations, voltage deviation=[(Umax-Umin)/Un] × 100%;
For 20KV and following three-phase power supply system, voltage deviation comprises the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%;
Voltage lower deviation=[(Umin-Un)/Un] × 100%;
For the unidirectional electric power system of 220V, voltage deviation also comprises the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%;
Voltage lower deviation=[(Umin-Un)/Un] × 100%;
The computing method of described voltage fluctuation rate comprise the steps:
Gather the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage stability bandwidth according to default voltage fluctuation rate computing formula and the second default collection period; The calculation interval of described plan calculating voltage stability bandwidth comprises some described the second collection period; The computing formula of described voltage fluctuation rate is: voltage fluctuation rate=[(Umax-Umin)/Un] × 100%;
Judge described electric power system the Umax of the calculation interval of described plan calculating voltage stability bandwidth and Umin whether be all greater than zero and Umax be greater than Umin, if it is calculate the voltage fluctuation rate of described electric power system at this calculation interval according to described voltage fluctuation rate computing formula, otherwise do not calculate;
The peaked computing method of described total harmonic distortion comprise the steps:
Gather the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage total harmonic distortion according to default total harmonic distortion computing formula and the 3rd default collection period, and calculate the described electric power system total harmonic distortion of each the voltage parameter acquisition time in this calculation interval according to described total harmonic distortion computing formula; The calculation interval of described plan calculating voltage total harmonic distortion comprises some described the 3rd collection period; Described total harmonic distortion computing formula is: total harmonic distortion=(root-mean-square valve/fundamental voltage effective value of each harmonic voltage) × 100%;
In above-mentioned all formula, each meaning of parameters is:
Umax: the maximum voltage that detects; Umin: minimum detection voltage; Un: the rated voltage of electric power system.
3. electric power system electricity quality evaluation method as claimed in claim 2, is characterized in that, also comprises the steps:
Get the maximal value in the total harmonic distortion of the each voltage parameter acquisition time in the described calculation interval calculating, the total harmonic distortion maximal value as described electric power system at this calculation interval;
The total harmonic distortion maximal value of each calculation interval is arranged in order according to magnitude relationship, casts out maximum 5% value, get value maximum in the value of residue 95% as the large value of total harmonic distortion 95% probability;
The described total harmonic distortion large value of 95% probability and its limits value are compared, and judge that according to comparative result whether it is qualified.
4. an electric power system electricity quality evaluation system, is characterized in that, comprising:
Power quality index setting module, power quality index and the limits value information thereof assessed for receiving the plan of user's input;
Assessment period setting module, for receiving the assessment period information of described power quality index of user input, the described assessment period comprises some calculation intervals;
Power quality index computing module, for gather the corresponding electrical energy parameter of each calculation interval according to default power quality index computing method, and calculates the power quality index of each calculation interval accordingly;
Power quality index evaluation module, for the power quality index of the each calculation interval calculating and its limits value are compared, determines that whether the power quality index of each calculation interval is qualified;
Power quality index statistical module, for adding up the qualification rate of described power quality index in the described assessment period according to the Qualification of each calculation interval power quality index.
5. electric power system electricity quality evaluation system as claimed in claim 4, is characterized in that, described power quality index comprises any one or more as follows:
Voltage deviation, voltage fluctuation rate, total harmonic distortion;
Described power quality index computing module comprises any one or more as follows:
Voltage deviation computing module, voltage fluctuation rate computing module, total harmonic distortion computing module;
Described voltage deviation computing module is used for gathering the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage deviation according to default voltage deviation computing formula and the first default collection period, and calculates the voltage deviation of described electric power system at this calculation interval according to described voltage deviation computing formula; The calculation interval of described plan calculating voltage deviation comprises some described the first collection period;
For 35KV and above electric power system:
In the time that Umax and Umin are greater than Un, voltage deviation=[(Umax-Un)/Un] × 100%;
In the time that Umax and Umin are less than Un, voltage deviation=[(Umin-Un)/Un] × 100%;
When other situations, voltage deviation=[(Umax-Umin)/Un] × 100%;
For 20KV and following three-phase power supply system, voltage deviation comprises the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%;
Voltage lower deviation=[(Umin-Un)/Un] × 100%;
For the unidirectional electric power system of 220V, voltage deviation also comprises the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%;
Voltage lower deviation=[(Umin-Un)/Un] × 100%;
Described voltage fluctuation rate computing module is for gathering the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage stability bandwidth according to default voltage fluctuation rate computing formula and the second default collection period, judge described electric power system the Umax of the calculation interval of described plan calculating voltage stability bandwidth and Umin whether be all greater than zero and Umax be greater than Umin, if it is calculate the voltage fluctuation rate of described electric power system at this calculation interval according to described voltage fluctuation rate computing formula, otherwise do not calculate; The calculation interval of described plan calculating voltage stability bandwidth comprises some described the second collection period; The computing formula of described voltage fluctuation rate is: voltage fluctuation rate=[(Umax-Umin)/Un] × 100%;
Described total harmonic distortion computing module is used for gathering the relevant voltage parameter of described electric power system at the calculation interval of plan calculating voltage total harmonic distortion according to default total harmonic distortion computing formula and the 3rd default collection period, and calculates the described electric power system total harmonic distortion of each the voltage parameter acquisition time in this calculation interval according to described total harmonic distortion computing formula; The calculation interval of described plan calculating voltage total harmonic distortion comprises some described the 3rd collection period; Described total harmonic distortion computing formula is: total harmonic distortion=(root-mean-square valve/fundamental voltage effective value of each harmonic voltage) × 100%;
In above-mentioned all computing formula, each meaning of parameters is:
Umax: the maximum voltage that detects; Umin: minimum detection voltage; Un: the rated voltage of electric power system.
6. electric power system electricity quality evaluation system as claimed in claim 5, is characterized in that, described power quality index evaluation module also comprises the large value evaluation module of total harmonic distortion 95% probability, the large value evaluation module of described total harmonic distortion 95% probability is for getting the maximal value in the total harmonic distortion of each voltage parameter acquisition time of the described calculation interval calculating, total harmonic distortion maximal value as described electric power system at this calculation interval, the total harmonic distortion maximal value of each calculation interval is arranged in order according to magnitude relationship, cast out maximum 5% value, get value maximum in the value of residue 95% as the large value of total harmonic distortion 95% probability, the described total harmonic distortion large value of 95% probability and its limits value are compared, and judge that according to comparative result whether it is qualified.
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