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# A New Framework for Employing Responsive End-Users Using FAHP and PSO Algorithm

1 Faculty of Electrical Engineering, Shahid Beheshti University, A.C., Tehran, Iran

2 Department of Electrical Engineering, Jouybar Branch, Islamic Azad University, Jouybar, Iran

3 Department of Electrical and Electronics Engineering, Faculty of Engineering and Architectures, Nisantasi University, Istanbul, Turkey

4 Department of Information Electronics, Fukuoka Institute of Technology, Fukuoka, Japan

* Corresponding Author: Mehrdad Ahmadi Kamarposhti. Email:

*Computers, Materials & Continua* **2023**, *74*(1), 951-964. https://doi.org/10.32604/cmc.2023.032631

**Received** 24 May 2022; **Accepted** 27 June 2022; **Issue published** 22 September 2022

## Abstract

The capacitor bank and synchronous condenser have been the only available sources of reactive power. Nowadays, most of the appliances use a power electronic interface for their connection. Applying a power electronic interface adds many features to these appliances. One of the promising features is their capability to interact with Volt-VAR programs. In this paper was investigated the reactive power interaction of the end-user appliances. For this purpose, the distribution network buses are ranked based on their effectiveness, followed by studying their interaction in the Volt-VAR program. To be able to consider the uncertainties, Probability Density Function (PDF) curve was discretized to represent different scenarios, and the reduction method was utilized to reduce the situations.## Keywords

Nowadays, the operation of the power system is almost limited due to low voltages and contingencies. The setting of power factor closer to the applied loads is one of the useful solutions to overcome the low voltage problem, which also reduces power system loss and improve efficiency and loading of transmission line [1]. Loss reduction is a solution for energy efficiency improvement in Distribution System Management (DSM). Control of the reactive power resources often results in the better reactive power flow in the network and loss reduction. Traditionally, switchable shunt capacitor banks and synchronous condensers are the only available Volt-Ampere Reactive (VAR) sources in the network. Existing and forthcoming Distributed Energy Resources (DERs) can provide support of reactive power. Also because of their ever-increasing penetration, they are considered as significant future VAR sources that bring new opportunities for voltage enhancement and loss reduction [2].

The power electronic interface of the appliances can inject/absorb the reactive power based on their design capacity. This capability can be employed for local power factor correction programs. This method can be used in networks where costs and installation time are minimal, which are its advantages compared to other ways. The participation of the end-user in Volt-VAR programs resembles capacitor bank placement in many features [3]. The end-users with a power electronic interface can respond to their surrounding condition based on their control algorithm [4]. Responsive end-user devices (REDs) include personal computers, PHEV/EVs, elevators, appliances, and UPS systems. All of these devices are in the distribution network layer (Q-C bus) where some local problems can be solved without the involvement of the upper layers [5].

To take advantage of this potential end-user capability, three central questions must be responded to [6]:

• Which Q-C buses are the most effective?

• What is the optimized participation of each selected RED?

• How is the REDs uncertainty considered in problem formulation?

To rank the distribution network buses based on their effectiveness, different methods were reviewed in literature and found that sensitivity analysis is the most widely used approach. In this method, buses with higher sensitivity are prioritized for participation in the Volt-VAR program [7]. Practically, the buses with higher sensitivity necessarily are not preferred. For instance, a bus with relatively limited and high sensitivity participation capacity must not be selected for Volt-VAR program participation. Thus, we utilized the Fuzzy Analytical Hierarchy Process (FAHP) in the present work for Q-C buses, as the candidate bus selection [8]. Different optimization algorithms are used in literature to determine the selected Q-C buses participation in Volt-VAR programs [9]. Rogers et al. [1] used the “steepest descent approach” for optimization purposes. The sensitivity analysis and AC power flow are used in this paper for Q-C bus selection. The proposed method is implemented on IEEE 24-Bus Test System. The steepest descent approach is also used in [8] to solve the problem of optimization and minimize the sum of the differences of the voltage buses from their specified values, as the objective of the optimization function. To identify candidate buses, one of the criteria considered in this study is the sensitivity of the buses voltages regarding the reactive power injection. Load controllability was proposed as another criterion for candidate bus selection in this paper. The load controllability was allocated to each load based on former knowledge. Abessi et al. [5] applied the genetic algorithm to minimize the objective function. The objective function consists of voltage profile enhancement and reactive power change minimization.

One of the cases that the distribution system may face, is load uncertainty. The load forecast involves some degree of uncertainty that affects the calculations because of the nature of loads [10]. Generally, load estimation error follows certain distribution function [11,12]. Load uncertainty can model by variance and mean that are used to form Load Probability Density Function (PDF) [13,14]. Using the method of reducing the scenarios obtained from PDF discretization, a good initial large-scale problem approximation can be achieved [12].

None of the mentioned literature, except [15], considers all the criteria involved in candidate bus selection. This paper used FAHP as a multi-criteria decision-making method to prioritize the Q-C buses. Moreover, to examine the more realistic behavior of the loads, the uncertainty was added to the model comprehensively discussed in [15]. Incorporating the load uncertainty in addition to the proposed criteria could simulate more actual conditions of the power system, which gives a better understanding of the system for remedial actions.

• In Section 2, the following issues are addressed:

• Candidate bus selection method

• Load flow formulation

• Scenario generation and reduction

2.1 Selection of Candidate Q-C Bus

The goal of the conventional literature is to find buses in which reactive power injection/absorption has the best effect on the power system. The reactive power injection/absorption buses are indicated by Q-Controlled (Q-C) bus.

However, the advent of smart grids and home appliances with electronic power interfaces enables end users to participate in Volt/VAR applications. In this paper the FAHP method is used to determine the most efficient buses.

The final weights of the criteria is calculated by the fuzzy method in the FAHP method. Decision makers are often confronted with fuzzy sets to express the relative importance of one criterion in relation to other criteria. Therefore, FAHP is exploited in which the unfavorable ratios of comparisons are expressed as fuzzy [16].

In FAHP linguistic variables are used instead while in conventional AHP, a team of evaluators and expert staff fill in the comparison matrices and assigns a number to each criterion according to the other criteria [17].

Each element in the cross-comparison matrices is its displacement element. The explicit pairwise comparison used in conventional AHP has advantages such as simplicity. However, it seems incorrect to express the views of decision makers. In this paper, triangular fuzzy numbers have been used for fuzzy construction due to their accuracy.

The Eq. (1) describes the membership function of the triangular fuzzy number

where,

RED can inject reactive power based on the capacity of its electronic power interface. Hence, when a device is “ON”, the required active power occupies most of the capacity of its electronic power interface, and the device’s ability to inject reactive power in “OFF” mode is greatly increased. The Eq. (2) illustrates the capability of reactive power injection [5]:

where,

The voltage deviation, available reactive power, sensitivity, and power loss are the criteria that considered for selection of candidate Q-C bus in this paper,

Due to the characteristic of the radial distribution network and higher resistance/reactance ratio regarding the transmission system, the conventional power methods are not suitable for solving the problem of load flow.

The Branch-Current to Bus-Voltage (BCBV) and Bus-Injection to Branch-Current (BIBC) methods are appropriate techniques for solving the distribution system load flow. The main steps of this method are defined as below:

• Equivalent current injection

• Forming BIBC matrix

• Forming BCBV matrix

The voltage of each bus shall be updated by Eq. (3) [18]:

where

2.3 Scenario Generation and Reduction Method

Estimation of load data is one of the most necessary tasks in distribution system operation. Considering the nature of load in the distribution system, its variation with time over a wide range is inevitable. Therefore, the load data are regarded as stochastic variables [3]. Mathematical load estimation methods are used to estimate the load data in unmetered points; besides, for future load approximation, load forecast methods are used. Due to insufficient measurement and unpredictable load profile, the loads cannot be estimated accurately [10]. One of the most effective parameters in the occurred uncertainty is the load forecast uncertainty. The load estimation error follows specific distribution function [12]. The probability distribution assumes about one particular standard from random variables; e.g., normal, uniform or Poisson distribution. All distribution functions are determined by a set of parameters that are arranged with the probability of an event where the random variable is discrete or within a specified range of continuous values. The choice of a distribution model means the option of standard probability distribution and then adjusts its parameters according to the data [19]. The Eq. (4) describes the PDF of truncated normal distribution as follows:

where

Where

The CDF of truncated distribution is:

Based on historical data of the loads, the load is supposed to have a normal distribution [20].

The dimensionality of stochastic programming is directly dependent on the number of scenarios. Because scenario generation algorithm generates many situations that make the stochastic programming cumbersome, to solve the problem within a reasonable time, the conditions were reduced such that a tradeoff is made between computational burden and accuracy of the results. Reference [20] proposed the method used for scenario reduction in the present paper. The reduction method determines a subset of scenarios and allocates a new probability to the chosen situations.

The Section 3 focuses on the proposed approach. The proposed method consists of four main stages.

As shown in Fig. 1, in the first stage, the network, load, and end-users data are acquired. In next step, these data are used for two primary purposes: candidate bus selection; and scenario generation and reduction. Candidate bus selection and scenario generation and modification are performed based on the approaches described in Section 2.1 and 2.3, respectively. In the third stage, PSO algorithm is used to specify optimal participation of candidate buses in scenarios. The results of the proposed approach are obtained in stage 4.

As discussed in Section 2.2, the BIBC and BCBV method are used as direct approaches for distribution load flow solution [18]. Voltage sensitivity to reactive power is one of the key criteria in selecting a Q-C bus. The sensitivities are commonly used to estimate the effect of a small variable change on the rest of the system.

The method presented in [8] is used to calculate the sensitivity matrices. It was confirmed that small load changes do not lead to significant changes in the sensitivity matrix data. Hence, a snapshot of the base load was used as input data for sensitivity analysis to simplify the problem. The sensitivity of g to reactive power injection is calculated as follow [5]:

Where

Distribution system nodes are ranked according to their priority using the FAHP method. The Eq. (7) describes the objective function of the optimization problem.

where

To evaluate the available reactive power of each bus, it is necessary to carefully examine the loads connected to each bus and the capacity of their electronic power interface. However, this research is beyond the scope of this article. To evaluate the effectiveness of the proposed method, the available reactive power for each bus was considered:

where

An IEEE 33 Distribution Testing System has been used to illustrate the effectiveness of the proposed method [21,22]. It contains 33 buses and 32 sections. The base voltage and the base load are 12.66 kV and 100 MVA respectively. The total reactive load is 2300 kVAR and the total reactive active load is 3720 kW. Fig. 2 shows the single-line diagram of test system.

The distribution system buses were ranked by applying FAHP algorithm (Fig. 3). The buses with higher relative priority are in the higher priority to participate in Volt-VAR programs.

In this paper, two scenarios of 9 effective buses and 17 effective buses are used to determine the optimal end-user participation in Volt-VAR applications. As illustrated previously, the FAHP method was employed to determine the candidate buses for each mentioned scenarios. The candidate buses for two pre-mentioned scenarios are shown in Tab. 1.

The PSO optimization method is used to define the optimal participation of Q-C buses in Volt-VAR applications. This heuristic optimization algorithm is a population-based stochastic optimization, which is because of evolutionary calculus and artificial life. The main idea of the PSO is originated from organism social behavior, such as fish school, bird flocking and human social relations. The PSO properties such as a low constraint on the continuity of objective function and its ability to adapting to the dynamic situation, make it one of the most useful swarm intelligence algorithms [23–43].

The dynamic convergence behavior of PSO method for nine candidates and 17 candidate Q-C buses are plotted in Figs. 4 and 5, respectively.

The local reactive power compensation leads to many benefits such as improving system power factor, increasing system capacity, reducing network loss, and improving voltage profile. By participating the nine candidate buses in Volt-VAR program, the improvement of the voltage profile of the distribution network buses is expected. The voltage of the IEEE 33 bus system before/after the end-user participation in the first scenario is presented in Fig. 6. As can be seen in Fig. 6, the profile of distribution system voltage can be improved by the involvement of the end-users in reactive power compensation. In the second scenario, the available end-users for participation in Volt-VAR programs increase to 17 candidate buses. The distribution system buses voltage profile of this scenario is described in Fig. 7.

The reactive power injected by candidate Q-C buses in scenario 1 is shown Figs. 8 and 9 is for scenario 2. In Figs. 8 and 9, the unit of injected reactive power is VAR. The optimum responsive power compensation values are defined by the approach illustrated in Fig. 1.

The results of load forecast and load estimation are not accurate, and therefore it is recommended that, given the uncertainty of load in the analysis of the distribution system. To consider the stochastic load behavior, scenario generation and reduction approach (described earlier) was used. The voltage expected value for both pre-mentioned scenarios are shown in Figs. 10 and 11.

As described previously, the stochastic load consideration resulted in the more realistic outcome. Results from technical literature together with those of the presented study are summarized in Tab. 2.

Emerging the smart grid provides numerous benefits to the conventional distribution system. Nowadays, most of the end-user appliances use the power electronic interface for their connection to the distribution system. The power electronic interface enables these devices to inject/absorb reactive power based on the network condition and improve the distribution system stability and voltage profile. The FAHP method, because of its accuracy in dealing with multi-objective decision-making was used for Q-C bus ranking and the optimum participation of end-user obtained from PSO method. To simulate a more realistic situation in this work, the load uncertainty was also considered. Most of the current end-user appliances use power electronic interface for their connection. Such instruments have the ability of the reactive power injection/absorption. Exploiting this new capability is very beneficial for distribution system operation and results in a power factor correction closer to the load and voltage profile enhancement. As work in the future, we can consider renewable sources with the same approach in the paper and analyze their effect. Uncertainty in the generation of these resources and emergencies can also be considered.

Funding Statement: The authors received no specific funding for this study.

Conflicts of Interest: The authors declare that they have no conflicts of interest to report regarding the present study.

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*74*

*(1)*, 951-964. https://doi.org/10.32604/cmc.2023.032631

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