Fair distribution of losses in the hottest transmi

Fair distribution of transmission losses

Abstract: how much power users' losses on power components are caused by each other is the reasonable transmission cost in the power market. It is an important content of allocation, which reflects the law of the stage of economic development. It is a problem that has not been discussed in the traditional circuit theory and can not be answered in practice, so it has aroused widespread interest and controversy. Based on the basic theory of circuit, the author gives the basic properties of branch loss and puts forward the basic requirements of reasonable allocation of branch loss. Several typical branch loss allocation algorithms at home and abroad are deeply studied, some fuzzy understandings of these algorithms are analyzed, and the advantages, disadvantages and applicability of various methods are pointed out in theory

key words: power market loss allocation cost allocation 1 Introduction

at present, the world power industry is undergoing unprecedented changes, and the traditional top-down production and operation mode (monopoly mode) of the power industry is transforming to the production and operation mode of power generation companies, transmission companies and distribution companies. The introduction of retail transshipment, the establishment of power commodity market, the introduction of competition mechanism, and the reduction of the consumption price of power commodities will enable users to get real benefits. Under the condition of power market, power generation companies and users will raise issues such as what loads are delivered by a generator, how much power flow is provided by the power generation company in a user, and how much loss is caused by the power generation company on a certain power equipment. These issues are the basis of fair distribution of transmission costs, an important basis for transmission pricing, and improving the transparency of transmission system operation The key to ensure the healthy development of power market. These problems can not be solved by traditional circuit theory and can not be avoided in the environment of power market. Therefore, they have attracted widespread attention []

this paper makes an in-depth study on several typical branch loss allocation algorithms at home and abroad, aiming at 7. Protecting the tension machine twice a month on average. Based on the basic theory of circuit, the basic properties of branch loss and the basic requirements of reasonable allocation of branch loss are given, and the rationality, advantages and disadvantages and scope of application of various methods are pointed out in theory. The corresponding conclusions are given for some views and disputes, which lays a theoretical foundation for the reasonable allocation of transmission costs and improving the fairness of the power market

2 branch model and basic properties of branch loss

Figure 1 shows any electrical branch L (or I-J), the equivalent impedance is rl+jxl, the node voltage is (amplitude is VI and VJ), and the active and reactive power flows from node i to node j. Each power supply supplies complex power to branch L through other branches or directly through node I. Let the current component of power supply m to the head end of branch l be JBML, then the total complex current flowing into branch L is

, where n is the total number of power supplies in the electricity

the total active loss on branch L is

it is not difficult to see from equations (2) ~ (3) that the branch loss has the following basic properties:

property 1: the active (or reactive) current of the power supply has a cross influence on the branch reactive (or active) loss

property 2: there is cross action between the active current and reactive current of the power supply, which affects the branch loss, while there is no cross action between the active current and reactive current of the power supply

property 3: the active (or reactive) loss of the branch is related to the greatly increased resistance (or reactance) of the electrical shock absorption performance and durability of the branch, but has nothing to do with the reactance (or resistance) of the branch

property 4: the total active (reactive) loss of the branch is directly proportional to the square of the modulus (current effective value) of the total complex current of the branch

these properties have clear physical significance

among the above properties, only property 4 is quantitative, and the rest are qualitative. Therefore, a reasonable branch loss allocation algorithm should meet the basic requirements of properties 1~3

3 method 1: branch loss allocation method based on superposition theorem

literature [1] after calculating the current component of each power supply on the branch based on the superposition theorem of the circuit, the definition of the power component caused by each power supply in the same branch is analyzed and given, and the expression of the power loss component caused by each power supply in the branch is derived and given

according to the general electromechanical principle of the spindle of the friction and wear testing machine, the current component of the power supply m on the branch L is set as, according to the formula (3) in literature [1], the complex power component caused by the power supply m in the branch L is, and the loss component is (see the end of Section IV of literature [1]). It is considered that the complex power loss component caused by power supply m in branch L