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Three-phase imbalance suppression system and suppression method based on heat accumulating type intelligent load

An intelligent load, regenerative technology, applied in the direction of reducing the asymmetry of the multiphase network, eliminating/reducing the asymmetry of the multiphase network, parallel feeding arrangement of the single network, etc., can solve the unfavorable multi-energy flow requirements and reasonably control and transform Due to the large amount of engineering work and the low enthusiasm of intelligent loads, it can achieve the effect of flexible and reliable multi-energy demand response and improving power quality.

Active Publication Date: 2022-04-15
STATE GRID ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, traditional electric water heaters are installed in users' homes in a decentralized manner. On the one hand, it leads to a close coupling relationship between users' heat demand and electricity demand, which is not conducive to the reasonable regulation of multi-energy flow demand; on the other hand, in the operating environment of the existing electricity market , for individual households, the enthusiasm for installing smart loads is not high, and a large number of renovation projects are relatively large

Method used

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  • Three-phase imbalance suppression system and suppression method based on heat accumulating type intelligent load
  • Three-phase imbalance suppression system and suppression method based on heat accumulating type intelligent load
  • Three-phase imbalance suppression system and suppression method based on heat accumulating type intelligent load

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Embodiment 1

[0030] Such as figure 1 As shown, a three-phase unbalance suppression system based on regenerative intelligent loads in this embodiment includes an active power control module and a key load ( Z A ,Z B ,Z C ) and smart loads, smart loads include non-critical loads (R A , R B , R C ) and the electric spring ES in series with the non-critical load, the key load voltage is regulated by ES, and the output of ES is allowed to fluctuate, the effective value of the three electric spring ES voltages connected in parallel on the three-phase bus may be the same, or may Not the same, it can be regarded as an adaptive three-phase voltage source for non-critical loads. The operation of the electric spring ES will maintain the voltage of critical loads well, and the voltage fluctuation range of non-critical loads is relatively large. Non-critical loads use Regenerative load. In this embodiment, the thermal storage load adopts a three-phase thermal storage water heater. The three-phase...

Embodiment 2

[0041] In this embodiment, a suppression method based on a three-phase unbalance suppression system based on a regenerative intelligent load includes the following steps:

[0042] (1) Obtain the current and voltage values ​​on the critical load through two sequence component extractors, the current and voltage values ​​include positive, negative and zero sequence components of current and voltage;

[0043] (2) According to the obtained current and voltage values, the optimal state of the electric spring output is determined through the electric spring adjustment value generator, and the voltage and current reference value of the key load is calculated:

[0044] u ESref_ABC =U S_ABC -R NC ·(I Sref_ABC -I C_ABC )

[0045] I NC_ABC =1 / R NC ·(U S_ABC -U ESref_ABC )

[0046] u ESref_ABC Indicates the three-phase reference voltage reference axis formed by a static coordinate system formed by the A axis, the B axis and the C axis; the power supply voltage of the A phase is...

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Abstract

The invention discloses a three-phase imbalance suppression system based on a heat storage type intelligent load, which comprises an active control module, a key load, a non-key load and a power spring, and is characterized in that the non-key load comprises three heat storage load units, a heat output unit and a heat output control unit which are respectively connected with the power spring in series; the three heat storage load units are connected to three phases of the three-phase bus in parallel, the active power control module adjusts power consumption of the three heat storage load units, and the heat output control unit controls heat output of the three heat storage load units. Single-phase intelligent loads are formed through the heat storage load units and the power springs to adjust three-phase imbalance of the power distribution network, the imbalance condition of the three-phase loads is improved through source-load interaction, and therefore the electric energy quality is improved, and the three single-phase heat storage type intelligent loads are combined with the heat output unit. The heat output unit additionally supplies heat independently to decouple the heat demand and the electricity demand of the user, and more flexible and reliable multi-energy demand response can be achieved.

Description

technical field [0001] The invention relates to grid connection of new energy power generation, in particular to a three-phase unbalance suppression system and suppression method based on a thermal storage type intelligent load. Background technique [0002] With the urgent need for energy conservation, emission reduction and energy low-carbonization, new energy technologies have been widely developed and applied. However, the large-scale random access of new high-power power generation and consumption equipment such as household photovoltaics and electric vehicles has made the power flow distribution characteristics of the traditional distribution network more complex, resulting in a sharp increase in the frequency of three-phase imbalances in the power system. The problem of three-phase unbalanced faults caused by short circuit or disconnection faults has been properly solved, but for the three-phase unbalanced caused by the unbalanced three-phase load of the system, at pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26H02J3/12H02J3/48
CPCY02E10/56Y02E40/50
Inventor 李渊唐成虹陈永华杨冬梅李蔚刘澄黄磊李淑锋王方胜李吉平
Owner STATE GRID ELECTRIC POWER RES INST