CN110045212A - A kind of method and system that line loss per unit is evaluated based on electric energy metering device uncertainty - Google Patents
A kind of method and system that line loss per unit is evaluated based on electric energy metering device uncertainty Download PDFInfo
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Abstract
本发明公开了一种基于电能计量装置不确定度对线损率进行评价的方法，所述方法包括：确定统计线损率的定义；分析影响所述线损率准确度的电能计量装置组成部分的综合误差及线损率的不确定度；基于所述电能计量装置组成部分的综合误差及不确定度对所述线损率进行评价。
The invention discloses a method for evaluating the line loss rate based on the uncertainty of an electric energy metering device. The method includes: determining the definition of a statistical line loss rate; analyzing the components of the electric energy metering device that affect the accuracy of the line loss rate The comprehensive error and the uncertainty of the line loss rate; the line loss rate is evaluated based on the comprehensive error and uncertainty of the components of the electric energy metering device.
Description
技术领域technical field
本发明涉及电能计量技术领域，更具体地，涉及一种基于电能计量装置不确定度对线损率进行评价的方法及系统。The invention relates to the technical field of electric energy measurement, and more particularly, to a method and system for evaluating line loss rate based on the uncertainty of an electric energy measurement device.
背景技术Background technique
线损是一个综合性的经济技术指标，可衡量供电企业的技术管理、运行管理、计量管理、用电管理、营业管理等方面的水平。近年来，通过对跨省输电线路计量装置、线路负荷工况、关口电量统计报表等数据分析，发现许多输电线路的线损率出现了负线损情况，且多发生在轻载条件下。由于跨省输电线路电量交换频繁且交易量巨大，负线损的出现会使关口计量的准确性与公平性受到质疑，而且极易产生贸易结算问题甚至引起法律纠纷。Line loss is a comprehensive economic and technical indicator, which can measure the level of technical management, operation management, metering management, power consumption management, business management and other aspects of power supply enterprises. In recent years, through the data analysis of inter-provincial transmission line metering devices, line load conditions, and gateway electricity statistical reports, it is found that many transmission lines have negative line loss in the line loss rate, and most of them occur under light load conditions. Due to the frequent power exchange and huge transaction volume of inter-provincial transmission lines, the occurrence of negative line losses will make the accuracy and fairness of gateway measurement questionable, and it is very easy to cause trade settlement problems and even legal disputes.
因此，需要一种技术，以实现基于电能计量装置不确定度对线损率进行评价。Therefore, a technique is needed to realize the evaluation of the line loss rate based on the uncertainty of the electric energy metering device.
发明内容SUMMARY OF THE INVENTION
本发明技术方案提供一种基于电能计量装置不确定度对线损率进行评价的方法及系统，以解决如何基于电能计量装置不确定度对线损率进行评价的问题。The technical scheme of the present invention provides a method and system for evaluating the line loss rate based on the uncertainty of the electric energy metering device, so as to solve the problem of how to evaluate the line loss rate based on the uncertainty of the electric energy metering device.
为了解决上述问题，本发明提供了一种基于电能计量装置不确定度对线损率进行评价的方法，所述方法包括：In order to solve the above problems, the present invention provides a method for evaluating the line loss rate based on the uncertainty of an electric energy metering device, the method comprising:
确定统计线损率的定义；Determine the definition of statistical line loss rate;
分析影响所述线损率准确度的电能计量装置组成部分的综合误差及线损率的不确定度；Analyzing the comprehensive error of the components of the electric energy metering device that affects the accuracy of the line loss rate and the uncertainty of the line loss rate;
基于所述电能计量装置组成部分的综合误差及不确定度对所述线损率进行评价。The line loss rate is evaluated based on the comprehensive errors and uncertainties of the components of the electric energy metering device.
优选地，所述电能计量装置组成部分包括：电压互感器PT、电流互感器CT、二次回路压降、电能表。Preferably, the components of the electric energy metering device include: a voltage transformer PT, a current transformer CT, a secondary circuit voltage drop, and an electric energy meter.
优选地，统计线损率的定义为：Preferably, the statistical line loss rate is defined as:
线损率L＝送端电量W1-受端电量W2。Line loss rate L = power at the sending end W 1 - power at the receiving end W 2 .
优选地，所述电能计量装置组成部分的综合误差为电能计量装置组成部分误差之和，包括：电能表的误差、电压互感器PT的误差、电流互感器CT的误差以及二次回路电压降引起的合成误差之和。Preferably, the comprehensive error of the components of the electric energy metering device is the sum of the errors of the components of the electric energy metering device, including: the error of the electric energy meter, the error of the voltage transformer PT, the error of the current transformer CT, and the voltage drop caused by the secondary circuit The sum of the synthetic errors.
优选地，所述线损率的不确定度根据送端电能计量装置和受端电能计量装置的不确定度合成。Preferably, the uncertainty of the line loss rate is synthesized according to the uncertainty of the sending-end electric energy measuring device and the receiving-end electric energy measuring device.
基于本发明的另一方面，提供一种基于电能计量装置不确定度对线损率进行评价的系统，所述系统包括：Based on another aspect of the present invention, a system for evaluating line loss rate based on uncertainty of an electric energy metering device is provided, the system comprising:
确定单元，用于确定统计线损率的定义；Determining unit, used to determine the definition of statistical line loss rate;
分析单元，用于分析影响所述线损率准确度的电能计量装置组成部分的综合误差及线损率的不确定度；an analysis unit, configured to analyze the comprehensive error of the components of the electric energy metering device that affects the accuracy of the line loss rate and the uncertainty of the line loss rate;
评价单元，基于所述电能计量装置组成部分的综合误差及不确定度对所述线损率进行评价。The evaluation unit evaluates the line loss rate based on the comprehensive error and uncertainty of the components of the electric energy metering device.
优选地，所述电能计量装置组成部分包括：电压互感器PT、电流互感器CT、二次回路压降、电能表。Preferably, the components of the electric energy metering device include: a voltage transformer PT, a current transformer CT, a secondary circuit voltage drop, and an electric energy meter.
优选地，统计线损率的定义为：Preferably, the statistical line loss rate is defined as:
线损率L＝送端电量W1-受端电量W2。Line loss rate L = power at the sending end W 1 - power at the receiving end W 2 .
优选地，所述电能计量装置组成部分的综合误差为电能计量装置组成部分误差之和，包括：电能表的误差、电压互感器PT的误差、电流互感器CT的误差以及二次回路电压降引起的合成误差之和。Preferably, the comprehensive error of the components of the electric energy metering device is the sum of the errors of the components of the electric energy metering device, including: the error of the electric energy meter, the error of the voltage transformer PT, the error of the current transformer CT, and the voltage drop caused by the secondary circuit The sum of the synthetic errors.
优选地，所述线损率的不确定度根据送端电能计量装置和受端电能计量装置的不确定度合成。Preferably, the uncertainty of the line loss rate is synthesized according to the uncertainty of the sending-end electric energy measuring device and the receiving-end electric energy measuring device.
本发明技术方案提供一种基于电能计量装置不确定度对线损率进行评价的方法与系统，其中方法包括：确定统计线损率的定义；分析影响线损率准确度的电能计量装置组成部分的综合误差及线损率的不确定度；基于电能计量装置组成部分的综合误差及不确定度对线损率进行评价。本发明技术方案从统计线损的定义出发，结合不确定度，给出统计线损率与电能计量装置综合误差之间的关系。The technical scheme of the present invention provides a method and system for evaluating the line loss rate based on the uncertainty of the electric energy metering device, wherein the method includes: determining the definition of the statistical line loss rate; analyzing the components of the electric energy metering device that affect the accuracy of the line loss rate The comprehensive error and the uncertainty of the line loss rate; the line loss rate is evaluated based on the comprehensive error and uncertainty of the components of the electric energy metering device. The technical scheme of the present invention starts from the definition of statistical line loss, and combines the uncertainty to give the relationship between the statistical line loss rate and the comprehensive error of the electric energy metering device.
附图说明Description of drawings
通过参考下面的附图，可以更为完整地理解本发明的示例性实施方式：Exemplary embodiments of the present invention may be more fully understood by reference to the following drawings:
图1为根据本发明优选实施方式一种基于电能计量装置不确定度对线损率进行评价的方法流程图；1 is a flowchart of a method for evaluating line loss rate based on uncertainty of an electric energy metering device according to a preferred embodiment of the present invention;
图2为根据本发明优选实施方式一种基于电能计量装置不确定度对线损率进行评价的系统结构图。FIG. 2 is a structural diagram of a system for evaluating the line loss rate based on the uncertainty of an electric energy metering device according to a preferred embodiment of the present invention.
具体实施方式Detailed ways
现在参考附图介绍本发明的示例性实施方式，然而，本发明可以用许多不同的形式来实施，并且不局限于此处描述的实施例，提供这些实施例是为了详尽地且完全地公开本发明，并且向所属技术领域的技术人员充分传达本发明的范围。对于表示在附图中的示例性实施方式中的术语并不是对本发明的限定。在附图中，相同的单元/元件使用相同的附图标记。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 the purpose of this thorough and complete disclosure invention, and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the invention. In the drawings, the same elements/elements are given the same reference numerals.
除非另有说明，此处使用的术语(包括科技术语)对所属技术领域的技术人员具有通常的理解含义。另外，可以理解的是，以通常使用的词典限定的术语，应当被理解为与其相关领域的语境具有一致的含义，而不应该被理解为理想化的或过于正式的意义。Unless otherwise defined, terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is to be understood that terms defined in commonly used dictionaries should be construed as having meanings consistent with the context in the related art, and should not be construed as idealized or overly formal meanings.
图1为根据本发明优选实施方式一种基于电能计量装置不确定度对线损率进行评价方法流程图。本申请从统计线损率的定义角度出发，得到线路统计线损率的计算公式，再结合式中每一部分的误差不确定度，进行统计线损率的评价。如图1所示，一种基于电能计量装置不确定度对线损率进行评价的方法，方法包括：FIG. 1 is a flowchart of a method for evaluating line loss rate based on uncertainty of an electric energy metering device according to a preferred embodiment of the present invention. This application starts from the definition of the statistical line loss rate, obtains the calculation formula of the line statistical line loss rate, and then combines the error uncertainty of each part in the formula to evaluate the statistical line loss rate. As shown in Figure 1, a method for evaluating the line loss rate based on the uncertainty of an electric energy metering device, the method includes:
优选地，在步骤101：确定统计线损率的定义。本申请统计线损的定义为：Preferably, in step 101: determine the definition of the statistical line loss rate. The definition of statistical line loss in this application is:
统计线损(L)＝送端电量(W1)-受端电量(W2)(1)Statistical line loss (L) = power at the sending end (W 1 ) - power at the receiving end (W 2 ) (1)
从式(1)看出，统计线损率的准确度依赖于电能测量的准确性。而电量值W的准确性取决于电能计量装置，即：电压互感器(PT)、电流互感器(CT)、二次回路压降、电能表四部分测量准确性，电能计量装置每一组成部分的误差变化对综合误差值及其不确定度产生直接影响。本申请结合实际输电线路的现场检测值，分析电能计量装置各组成部分的测量误差，计算综合误差及其不确定度，进而分析统计线损的合理评价方法。It can be seen from formula (1) that the accuracy of statistical line loss rate depends on the accuracy of electric energy measurement. The accuracy of the electric energy value W depends on the electric energy measurement device, namely: voltage transformer (PT), current transformer (CT), secondary circuit voltage drop, electric energy meter measurement accuracy of four parts, each component of the electric energy measurement device The variation of the error has a direct impact on the overall error value and its uncertainty. The present application analyzes the measurement error of each component of the electric energy metering device, calculates the comprehensive error and its uncertainty, and then analyzes a reasonable evaluation method for statistical line loss based on the field detection value of the actual transmission line.
优选地，在步骤102：分析影响线损率准确度的电能计量装置组成部分的综合误差及线损率的不确定度。Preferably, in step 102: analyze the comprehensive error of the components of the electric energy metering device and the uncertainty of the line loss rate that affect the accuracy of the line loss rate.
本申请的电能计量装置由电能表、电流互感器、电压互感器及其二次回路构成，各个部分都有误差并且可以分别测得，DL/T1664-2016《电能计量装置检验规程》和《电能计量装置现场检验作业指导书》中规定，计量点的综合误差包括构成电能计量装置的各部分误差，具体为：The electric energy metering device of this application is composed of an electric energy meter, a current transformer, a voltage transformer and its secondary circuit, and each part has errors and can be measured separately. It is stipulated in the "On-site Inspection Operation Instructions for Metering Devices" that the comprehensive error of the metering point includes the errors of each part that constitutes the electric energy metering device, specifically:
(1)电能表的误差；(1) The error of the electric energy meter;
(2)电压互感器的误差；(2) Error of voltage transformer;
(3)电流互感器的误差；(3) Error of current transformer;
(4)电压互感器二次回路电压降引起的合成误差。(4) The synthetic error caused by the voltage drop of the secondary circuit of the voltage transformer.
行业标准DL/T1664-2016《电能计量装置现场检验规程》附录给出的综合误差计算方法如下：The comprehensive error calculation method given in the appendix of the industry standard DL/T1664-2016 "On-site Inspection Regulations for Electric Energy Metering Devices" is as follows:
合成误差：计量用电流、电压互感器的比值差和相位差以及计量用电压互感器二次回路压降的正交分量、同相分量在测量功率时的误差合成。Synthesis error: error synthesis of the measurement current, the ratio difference and phase difference of the voltage transformer, and the quadrature component and the in-phase component of the secondary circuit voltage drop of the measurement voltage transformer when measuring power.
综合误差：电能表误差和计量用互感器误差以及计量用电压互感器二次回路压降合成误差的代数和。Comprehensive error: the algebraic sum of the error of the electric energy meter, the error of the metering transformer and the combined error of the secondary circuit voltage drop of the metering voltage transformer.
三相四线有功单计量综合误差γ是电流、电压互感器的合成误差γh，电压互感器二次引线压降误差γd，电能计量单元的误差γe之间代数和。分别用式(2)至式(4)表示。The three-phase four-wire active power single metering comprehensive error γ is the algebraic sum of the combined error γ h of the current and voltage transformer, the voltage drop error γ d of the secondary lead of the voltage transformer, and the error γ e of the electric energy metering unit. They are represented by formula (2) to formula (4), respectively.
γ＝γh+γd+γe(2)γ = γ h + γ d + γ e (2)
式中：where:
fI1和δI1，fV1和δV1为第一元件电流、电压互感器的误差；f I1 and δ I1 , f V1 and δ V1 are the errors of the first element current and voltage transformer;
fI2和δI2，fV2和δV2为第二元件电流、电压互感器的误差；f I2 and δ I2 , f V2 and δ V2 are the errors of the second element current and voltage transformer;
fI3和δI3，fV3和δV3为第三元件电流、电压互感器的误差；f I3 and δ I3 , f V3 and δ V3 are the errors of the third element current and voltage transformer;
为功率因数角； is the power factor angle;
f1和δ1为第一元件电压互感器二次引线压降误差；f 1 and δ 1 are the voltage drop errors of the secondary leads of the first element voltage transformer;
f2和δ2为第二元件电压互感器二次引线压降误差；f 2 and δ 2 are the voltage drop errors of the secondary lead wires of the second element voltage transformer;
f3和δ3为第三元件电压互感器二次引线压降误差。f 3 and δ 3 are the voltage drop errors of the secondary lead of the third element voltage transformer.
优选地，在步骤103：基于电能计量装置组成部分的综合误差及不确定度对线损率进行评价。Preferably, in step 103: the line loss rate is evaluated based on the comprehensive error and uncertainty of the components of the electric energy metering device.
优选地，电能计量装置组成部分包括：电压互感器PT、电流互感器CT、二次回路压降、电能表。Preferably, the components of the electric energy metering device include: a voltage transformer PT, a current transformer CT, a secondary circuit voltage drop, and an electric energy meter.
优选地，统计线损率的定义为：Preferably, the statistical line loss rate is defined as:
线损率L＝送端电量W1-受端电量W2。Line loss rate L = power at the sending end W 1 - power at the receiving end W 2 .
优选地，电能计量装置组成部分的综合误差为电能计量装置组成部分误差之和，包括：电能表的误差、电压互感器PT的误差、电流互感器CT的误差以及二次回路电压降引起的合成误差之和。Preferably, the comprehensive error of the components of the electric energy metering device is the sum of the errors of the components of the electric energy metering device, including: the error of the electric energy meter, the error of the voltage transformer PT, the error of the current transformer CT and the synthesis caused by the voltage drop of the secondary circuit sum of errors.
优选地，线损率的不确定度根据送端电能计量装置和受端电能计量装置的不确定度合成。Preferably, the uncertainty of the line loss rate is synthesized according to the uncertainty of the sending-end electric energy measuring device and the receiving-end electric energy measuring device.
本申请分别评定电能计量装置每一组成部分的误差不确定度。综合误差等于电压、电流互感器合成误差、二次压降合成误差、电能表误差之和，由于电压互感器、电流互感器、二次压降合成误差、电能表误差在测试过程中是独立的，因此，综合误差不确定度评定第一步是分别计算四个组成部分的不确定度。第二步是进行各组成部分不确定度分量的汇总及计算。This application evaluates the error uncertainty of each component of the electric energy metering device separately. The comprehensive error is equal to the sum of voltage, current transformer synthesis error, secondary voltage drop synthesis error, and electric energy meter error. Because the voltage transformer, current transformer, secondary voltage drop synthesis error, and electric energy meter error are independent in the test process Therefore, the first step in the evaluation of the comprehensive error uncertainty is to calculate the uncertainty of the four components respectively. The second step is to summarize and calculate the uncertainty components of each component.
从统计线损率的定义出发，设输电线路送电端实际功率为P1，电能计量装置综合误差为ε1；受电端实际功率为P2，电能计量装置综合误差为ε2；输电线路技术线损率为εL，那么线路的统计线损率εT计算公式为：Starting from the definition of statistical line loss rate, let the actual power of the transmission end of the transmission line be P 1 , the comprehensive error of the electric energy metering device is ε 1 ; the actual power of the receiving end is P 2 , and the comprehensive error of the electric energy metering device is ε 2 ; The technical line loss rate is ε L , then the calculation formula of the statistical line loss rate ε T of the line is:
不确定度由技术线损率为εT的不确定度、送端电能计量装置的综合误差的不确定度以及受端电能计量装置综合误差的不确定度决定。由于技术线损率、送端电能计量装置综合误差和受端电能计量装置综合误差间不相关，因此，统计线损率的不确定度为：The uncertainty is determined by the uncertainty of the technical line loss rate ε T , the uncertainty of the comprehensive error of the sending-end power metering device, and the uncertainty of the comprehensive error of the receiving-end power metering device. Since there is no correlation between the technical line loss rate, the comprehensive error of the sending-end power metering device, and the comprehensive error of the receiving-end power metering device, the uncertainty of the statistical line loss rate is:
研究主要涉及电能测量对统计线损准确度的影响，因此，设定技术线损率为真值，不考虑其不确定度，那么统计线损率的不确定度为：The research mainly involves the influence of electric energy measurement on the accuracy of statistical line loss. Therefore, if the technical line loss rate is set to be a true value and its uncertainty is not considered, then the uncertainty of the statistical line loss rate is:
由式6可以看出，线路统计线损率εT的大小由技术线损率，送端、受端电能计量装置的综合误差决定。由式7可知，统计线损率的不确定度由送受端电能计量装置的不确定度合成，确定统计线损率的合理范围。It can be seen from Equation 6 that the size of the line statistical line loss rate ε T is determined by the technical line loss rate and the comprehensive error of the sending and receiving power metering devices. It can be seen from Equation 7 that the uncertainty of the statistical line loss rate is synthesized by the uncertainty of the power metering device at the sending and receiving ends to determine the reasonable range of the statistical line loss rate.
本申请实施方式从统计线损率的定义角度出发，得到线路统计线损率的计算公式，再结合式中每一部分的误差不确定度，进行统计线损率的评价。本申请有效解决了无法判断输电线路轻负载情况下，统计线损为负值的情况。From the perspective of the definition of the statistical line loss rate, the embodiments of the present application obtain a calculation formula of the line statistical line loss rate, and then combine the error uncertainty of each part in the formula to evaluate the statistical line loss rate. The present application effectively solves the situation that the statistical line loss is negative when it is impossible to judge the light load of the transmission line.
图2为根据本发明优选实施方式一种基于电能计量装置不确定度对线损率进行评价的系统结构图。如图2所示，一种基于电能计量装置不确定度对线损率进行评价的系统，系统包括：FIG. 2 is a structural diagram of a system for evaluating the line loss rate based on the uncertainty of an electric energy metering device according to a preferred embodiment of the present invention. As shown in Figure 2, a system for evaluating line loss rate based on uncertainty of electric energy metering device, the system includes:
确定单元201，用于确定统计线损率的定义；a determining unit 201 for determining the definition of the statistical line loss rate;
分析单元202，用于分析影响线损率准确度的电能计量装置组成部分的综合误差及线损率的不确定度；An analysis unit 202, configured to analyze the comprehensive error of the components of the electric energy metering device that affects the accuracy of the line loss rate and the uncertainty of the line loss rate;
评价单元203，基于电能计量装置组成部分的综合误差及不确定度对线损率进行评价。The evaluation unit 203 evaluates the line loss rate based on the comprehensive error and uncertainty of the components of the electric energy metering device.
优选地，电能计量装置组成部分包括：电压互感器PT、电流互感器CT、二次回路压降、电能表。Preferably, the components of the electric energy metering device include: a voltage transformer PT, a current transformer CT, a secondary circuit voltage drop, and an electric energy meter.
优选地，统计线损率的定义为：Preferably, the statistical line loss rate is defined as:
线损率L＝送端电量W1-受端电量W2。Line loss rate L = power at the sending end W 1 - power at the receiving end W 2 .
优选地，电能计量装置组成部分的综合误差为电能计量装置组成部分误差之和，包括：电能表的误差、电压互感器PT的误差、电流互感器CT的误差以及二次回路电压降引起的合成误差之和。Preferably, the comprehensive error of the components of the electric energy metering device is the sum of the errors of the components of the electric energy metering device, including: the error of the electric energy meter, the error of the voltage transformer PT, the error of the current transformer CT and the synthesis caused by the voltage drop of the secondary circuit sum of errors.
优选地，线损率的不确定度根据送端电能计量装置和受端电能计量装置的不确定度合成。Preferably, the uncertainty of the line loss rate is synthesized according to the uncertainty of the sending-end electric energy measuring device and the receiving-end electric energy measuring device.
已经通过参考少量实施方式描述了本发明。然而，本领域技术人员所公知的，正如附带的专利权利要求所限定的，除了本发明以上公开的其他的实施例等同地落在本发明的范围内。The present invention has been described with reference to a few embodiments. However, as is known to those skilled in the art, other embodiments than the above disclosed invention are equally within the scope of the invention, as defined by the appended patent claims.
通常地，在权利要求中使用的所有术语都根据他们在技术领域的通常含义被解释，除非在其中被另外明确地定义。所有的参考“一个/所述/该[装置、组件等]”都被开放地解释为所述装置、组件等中的至少一个实例，除非另外明确地说明。这里公开的任何方法的步骤都没必要以公开的准确的顺序运行，除非明确地说明。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/the/the [means, component, etc.]" are open to interpretation as at least one instance of said means, component, etc., unless expressly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
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