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Compensation method of compensation capacity of pure active three-phase imbalance load

A technology for compensating capacity and balancing load, applied in reactive power compensation, reactive power adjustment/elimination/compensation, reduction of multiphase network asymmetry, etc. , the lack of power grid compensation capacity and other issues

Active Publication Date: 2016-06-29
HEILONGJIANG ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the existing method for obtaining the compensation capacity of the pure active three-phase unbalanced load of the power grid is lacking in the project feasibility study stage, resulting in the problem that the three-phase voltage imbalance and power quality cannot be effectively treated

Method used

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  • Compensation method of compensation capacity of pure active three-phase imbalance load
  • Compensation method of compensation capacity of pure active three-phase imbalance load
  • Compensation method of compensation capacity of pure active three-phase imbalance load

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specific Embodiment approach 1

[0039] Embodiment 1: The compensation method for pure active three-phase unbalanced load compensation capacity described in this embodiment, the method includes the following steps:

[0040] Step 1. Use the three-phase positive sequence voltage to supply power to the three-phase unbalanced load, and obtain the effective value of the neutral point voltage of the three-phase unbalanced load, which are respectively and

[0041] in, is the phase voltage of the system, is a phase-to-ground voltage, is b phase-to-ground voltage, is the phase-to-ground voltage of c, j is the imaginary component;

[0042] Using the formula:

[0043]

[0044] Obtain the ab phase line voltage respectively bc phase-to-line voltage and ca phase line voltage

[0045] According to the formula:

[0046]

[0047] Obtain the load current of the ab branch in the delta connection respectively The load current of the bc branch and the load current of the ca branch

[0048] In th...

specific Embodiment approach 2

[0075] Specific implementation mode two: refer to figure 1 and figure 2 Describe this embodiment in detail. This embodiment is a further description of the compensation method for the pure active three-phase unbalanced load compensation capacity described in Embodiment 1. In this embodiment, in step 3, according to the three-phase balance compensation method , to obtain three-phase compensated reactive power, respectively at P 1 ab ≥P 1 bc ≥P 1 ca ≥0,P 1 ab ≥P 1 ca ≥P 1 bc ≥0,P 1 bc ≥P 1 ab ≥P 1 ca ≥0,P 1 bc ≥P 1 ca ≥P 1 ab ≥0,P 1 ca ≥P 1 ab ≥P 1 bc ≥0 or P 1 ca ≥P 1 bc ≥P 1 ab Under any two conditions in ≥0, the specific process of selecting the phase with the largest compensation power among the three-phase compensation reactive power is:

[0076] Assuming the supply voltage is balanced, the load Y 1 ab , Y 1 bc and Y 1 ca Represented by a network connected by triangles:

[0077]

[0078] According to the principle of three-phas...

specific Embodiment approach 3

[0100] Specific embodiment three: This embodiment is to further explain the compensation method of the pure active three-phase unbalanced load compensation capacity described in specific embodiment one. In this embodiment, in step four, the load that needs to be compensated in step two Multiply the compensation coefficient K as the actual negative sequence capacity that needs to be compensated, and compare the actual negative sequence capacity that needs to be compensated with the maximum value of the total compensation capacity in the three-phase system in step 3. When the actual negative sequence capacity that needs to be compensated When the difference between the sequence capacity and the maximum value of the total compensation capacity in the three-phase system is greater than or equal to zero, the specific process for obtaining the compensation coefficient K greater than or equal to 2 is:

[0101] at P 1 ab ≥P 1 bc ≥P 1 ca ≥0 and P 1 ca ≥P 1 bc ≥P 1 ab Under t...

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Abstract

The invention discloses a compensation method of a compensation capacity of a pure active three-phase imbalance load, and relates to the field of a power system. The method provided by the invention is used for solving the problem that the three-phase imbalance and electric energy quality cannot be effectively managed, wherein the problem results from the fact that there is no obtaining method of the compensation capacity of the pure active three-phase imbalance load of a power grid in the existing project feasibility study stage. Power is supplied to the three-phase imbalance load by a three-phase positive sequence voltage; a zero sequence current, a positive sequence current and a negative sequence current are obtained, thus obtaining a negative sequence capacity; the negative sequence capacity is compared with the three folds of the phase with the maximum compensation power in the three-phase compensation reactive powers obtained according to a three-phase balance compensation method; when the difference value of the zero sequence capacity actually needing to be compensated and the maximum of the total compensation capacity in the three-phase system is more than or equal to zero, an obtained compensation coefficient K is more than or equal to 2; and the pure active three-phase imbalance is compensated by the coefficient value. The method is applicable for balancing the three-phase power grid.

Description

technical field [0001] The invention relates to a compensation method for pure active three-phase unbalanced load compensation capacity. It belongs to the field of power system. Background technique [0002] In recent years, with the unbalanced loads such as electric traction locomotives and AC electric arc furnaces and the increasing number of new energy sources such as wind power and photovoltaics, the three-phase imbalance of the power system has become more and more serious. Three-phase unbalance will cause a series of adverse effects such as abnormal operation of electrical equipment, increased system additional loss, and interference with communication systems. Article 32 of the "Electricity Law of the People's Republic of China" stipulates: "The use of electricity by users shall not endanger the safety of power supply and use of electricity, or disturb the order of power supply and use of electricity. Businesses have the right to stop." [0003] For electrical equi...

Claims

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Application Information

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IPC IPC(8): H02J3/26H02J3/18
CPCY02E40/30Y02E40/50H02J3/26H02J3/18
Inventor 张明江祖光鑫郭江涛师广志任强徐冰亮于海洋陈晓光武国良盛玉和董尔佳郭袅
Owner HEILONGJIANG ELECTRIC POWER RES INST
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